manual chiller 10 14

Operation and Installation Manual

Glacier Series Air- and Water-Cooled

Portable Chillers Important! Read Carefully Before Attempting to Install or Operate Equipment

Part No. A0533711 Bulletin No. AE2-610B

$30.00

Glacier Series Portable Chillers

Performance figures stated in this manual are based on a standard atmosphere of 59°F (15°C) at 29.92” Hg (1,014 millibars) at sea level, using 60 hz power. Altitude is an important consideration when specifying chillers. AEC/Application Engineering can advise you on proper selection and sizing of systems for your operating environment.

AEC/Application Engineering is committed to a continuing program of product improvement.

Specifications, appearance, and dimensions described in this manual are subject to change without notice.

© Copyright AEC/Application Engineering and AEC, Inc. 2006

All rights reserved. Effective 3/8/2006 Part No. A0533711 Bulletin No. AE2-610B.2


Safety Considerations

Application Engineering Glacier Series portable chillers are designed to provide safe and reliable operation when installed and operated within design specifications, following national and local safety codes. To avoid possible personnel injury or equipment damage when installing, operating, or maintaining this equipment, use good judgment and follow these safe practices:

Follow all SAFETY CODES. Wear SAFETY GLASSES and WORK GLOVES. Disconnect and/or lock out power before servicing or maintaining the chiller. Use care when LOADING, UNLOADING, RIGGING, or MOVING this equipment. Operate this equipment within design specifications. OPEN, TAG, and LOCK ALL DISCONNECTS before working on equipment. You

should remove the fuses and carry them with you. Make sure the chiller and components are properly GROUNDED before you switch on

power. When welding or brazing in or around this equipment, make sure VENTILATION is

ADEQUATE. PROTECT adjacent materials from flame or sparks by shielding with sheet metal. An approved FIRE EXTINGUISHER should be close at hand and ready for use if needed.

The refrigeration system can develop refrigerant pressures in excess of 500 psi (3,447.5 kPa/ 34.47 bars). DO NOT CUT into the system until pressure has been relieved.

Do not jump or bypass any electrical safety control. Do not restore power until you remove all tools, test equipment, etc., and the chiller and

related equipment are fully reassembled. Only PROPERLY TRAINED personnel familiar with the information in this manual should

work on this equipment.


Table of Contents

1 General Information .................................................7 1-0 Introduction 1-1 Necessary Documents 1-2 Models Covered 1-3 Available Options

2 Shipping Information..............................................11 2-1 Unpacking and Inspection 2-2 In the Event of Shipping Damages 2-3 If the Shipment is Not Complete 2-4 If the Shipment is Not Correct 2-5 Returns

3 Installation...............................................................13 3-0 Electrical Connections 3-1 Process Water Connections 3-2 Water Connection Sizing 3-3 Bypass Valve 3-4 Galvanic Corrosion 3-5 Water Treatment 3-6 Water Cooled Chiller Water Connections 3-7 Air Cooled Chiller Air Supply 3-8 Condensing Air Temperature 3-9 Motor Direction Check 3-10 Water Reservoir 3-11 Automatic Reservoir Make Up Installation

4 Sequence of Operation ..........................................23 4-0 Chilled Water Circuit 4-1 Refrigeration Circuit 4-2 Freezestat Control 4-3 Crankcase Heater 4-4 High Pressure Cut Out 4-5 Low Pressure Cut Out 4-6 Oil Pressure Safety Switch 4-7 Fan Cycling Switch 4-8 Float Switch 4-9 Remote Start/Stop Interlock


Table of Contents

5 Startup Checklist ....................................................37 5-0 Introduction 5-1 Water-Cooled Pre-Startup Checklist 5-2 Water-Cooled Chiller Startup 5-3 Air-Cooled Pre-Startup Checklist 5-4 Air-Cooled Chiller Startup

6 Control Operation...................................................41 6-0 The NX Control 6-1 NX Display Interpretation 6-2 NX Control Buttons 6-3 NX Control Operation 6-4 Auto-Tune Procedure

7 Graphic Panel..........................................................45 7-0 Introduction 7-1 Low Water Level Light 7-2 High Refrigerant Pressure Light 7-3 Low Refrigerant Pressure Light 7-4 Freezestat Light 7-5 Low Oil Pressure Light 7-6 Power Light 7-7 Hot-Gas Bypass Light 7-8 Compressor Light 7-9 Pump Light

8 Routine Maintenance .............................................53 8-0 Lubrication 8-1 Filter Cleaning 8-2 Condenser Maintenance 8-3 Preventative Maintenance Service

9 Troubleshooting .....................................................59


Charts and Figures

1 Dimensions - NXGA 5 - 15 7

2 Dimensions - NXGA 20 - 25 8

3 Dimensions - NXGW 5 - 15 9

4 Dimensions - NXGW 20 - 30 10

5 Pump Curves - 60 Cycle 13

6 Pump Curves - 50 Cycle 14

7 Evaporator GPM/Pressure Drop Curves 15

8 Condenser GPM/Pressure Drop Curves 16

9 Typical Ductwork, NXA 5 - 15 20

10 Typical Ductwork NXA 20 - 25 21

11 Central and Gravity Return Piping 24

12 Automatic Reservoir Make Up Option 26

13 Piping Diagram - NXG 1-Pump 28

14 Piping Diagram - NXG 2-Pump 29

15 Piping Diagram - NXG 1-Pump w/o Tank 30

16 Piping Diagram - NXG 2-Pump w/o Tank 31

17 Piping Diagram - NXG w/o Pump, w/o Tank 32

18 Freezing Point Curve 34

19 The NX Control 39

20 Typical Graphic Panel 44

21 Typical NX Series Sub-Panel Layout 46

22 Typical Electrical Schematic - NXA 47

23 Typical Electrical Schematic - NXG 48


1 General Information

1-1 Introduction AEC/Application Engineering Glacier Series portable water chillers are reliable, accurate, and easy to use process cooling units. They are available in both air and water cooled designs in a range of sizes from 5 to 30 tons. All are self contained, fully portable, and shipped ready to use. A properly installed, operated, and maintained Glacier Series portable chiller provides many years of reliable operation. To get the most satisfaction from your new chiller, read and follow the instructions in this manual.

1-2 Necessary Documents The following documents are necessary for the operation, installation and maintenance of an Application Engineering Glacier Series portable chiller. Additional copies are available from AEC, Inc. Familiarize the appropriate personnel with these documents: • This manual.

• The electrical schematic and connection diagram mounted inside the control enclosure. Typical schematics for general reference are provided in Figures 21 through 23.

• The operation and installation manuals for accessories and options selected by the customer.

• The Customer Parts List included in the information packet.

1-3 Models Covered This manual provides operation, installation, and maintenance instructions for Application Engineering Glacier Series Portable Chillers. Model numbers can be found on the chiller serial tag. You should know the model number, serial number, and operating voltage of your chiller if you need to contact AEC/Application Engineering. Glacier Series chiller models are designated by compressor horsepower (5, 7.5, 10, 15, 20, 25, 30, 35, and 40) and the cooling method used—air-cooled are NXGA, water-cooled are NXGW, and remote air-cooled units are NXGR. All sizes are available with either cooling method with the exception of the 35 hp and 40 hp systems, which are available in the water-cooled configuration only.


1-4 Standard Features Mechanical

Compressors Hermetic compressors are used on on 5 hp to 10 hp models, Semi-hermetic Discus compressors are used on 15 to 40 hp models. Evaporator Cleanable shell and tube evaporators are used on Glacier chillers. Condenser Fin/tube condensers are used on NXGA air-cooled units with air filter(s), package unit only. Cleanable shell and tube condensers are used on NXGW water-cooled units with cooling water regulating valves for tower or city water. Remote air-cooled copper tube/aluminum fin with low ambient control via pressure-actuated fan staging and a variable-speed primary fan are used on NXGR remote air-cooled models. Reservoir 40-gallon polyethylene tanks are used on 5 hp to 30 hp models. 60-gallon mild steel tanks are used on 35 and 40 hp models. Pump Non-overloading ODP motor, horizontally-mounted with seal flush line. Other Mechanical Features

• NEMA-rated ODP fan/blower motor(s) (air-cooled units) • Painted structural steel frame and panels with 4” swivel casters • Mounting rails for NXGR models • Pressure-actuated Process water bypass valve (single pump models only) • Valved Process water connections • External fill/drain sight glass • To Process 2½” dual scale liquid-filled water pressure gauge • Low Process water temperature freezestat • Low oil pressure cut-outs on 15 to 40 hp models • Low water flow switch


• Fully insulated refrigeration and process piping

Electrical Features

• Fully accessible NEMA 1-style electrical control enclosure • Single-point connection

Refrigeration Features

• R-22 refrigerant • Hot gas bypass capacity control • Refrigerant suction accumulator • High and low refrigerant pressure cut-outs • High pressure relief valve • Multiple refrigeration access ports

Control Features

• Off-the-shelf microprocessor-based PID auto-tuning control with To Process and Set Point LED readout

• Graphic control panel with indicating and warning status lights

Other Features

• New AEC Warm Gray paint • 1 year warranty on parts and labor • 3 year warranty on controller parts

1-5 Available Options Glacier Series portable chillers are available with options that tailor the unit to your requirements. Some are factory installed and some can be retro-fitted in the field. Consult your sales representative for more information.


Automatic Water Make Up This option includes a pressure regulating valve, a float valve in the reservoir and the necessary solenoid valve and pipe fittings to connect a Glacier Chiller to an automatic make up system. AEC, Inc. offers the necessary components for automatic make-up and water treatment systems. See Chapter 3 for more information. Crankcase Pressure Regulating (CPR) Valve A crankcase pressure regulating (CPR) valve is available for leaving water temperatures up to 75°F (24°C). This valve extends compressor life by limiting maximum allowable suction pressure. Operating Voltages Glacier Series portable chillers are available configured for 208-230/3/60, 380-415/3/50, 460/3/60, 515/3/50, and 575/3/60 volts. Note: Make sure that you de-rate system capacity by 17% when running your unit at 50 Hz. Available Communications Options External communications protocols for your Glacier Series chiller include single-port NX protocol with RS-232C, RS-422, and RS-485; SPI protocol is also available. Reservoirs A 40-gallon polyethylene reservoir is standard, with mild steel and stainless steel as optional tank materials. Glacier Series portable chillers are available without a reservoir for processes that use their own reservoir. Fan Cycling Pressure Switch Applications with low ambient temperatures benefit from this option. A pressure switch cycles the primary fan OFF and ON in low ambient temperatures to maintain efficient condensing pressures. Fan cycling switches are standard on Glacier Series chillers; a second switch is optional on two (2) fan/blower models. UL Listed Electrical Subpanel This option includes branch fusing, which offers multiple fuse protection on major components. Branch Fusing Branch fusing provides multiple fuse protection on major components. NEMA 12 Electrical Enclosure This option provides NEMA 12-level electrical enclosure protection. It includes an accessible protective window kit over the graphic panel.


Door Interlock The door interlock option is a solenoid installed on the door which automatically locks the enclosure door when you apply power to your chiller. Non-Fused Through-Door Disconnect This option provides fast, safe power disconnection for your chiller. This large rotary switch is located on the front door of the unit enclosure. The design also lets you place a padlock on the switch for added safety. It is available in 208, 230, 460, and 575 voltages. General Fault Indicator This option transmits an alarm signal to alarm device(s) when any of the inherent safeties are tripped. Audible/Visual High-Temperature Alarms These options provide a strobe and buzzer to alert the operator of temperatures above the alarm set point. It also includes an audible alarm silence switch. A separate visual-only alarm option is available without the buzzer. High Pressure Fans High pressure fans are available for installations where the exiting air is to be exhausted though ductwork. These fans are available on 5 through 15 horsepower air-cooled Glacier chillers. They may be retro-fitted without sheet metal modification. Mounting Options All standard air-cooled NXGA and water-cooled NXGW Glacier chillers come standard with 4” swivel casters, which can be deleted at the time of order. Remote air-cooled NXGR Glacier chillers come standard with mounting rails, which are available as an option to air- and water-cooled Glacier models. Mounting rails add 5” to unit length. Other mounting options include 5”-diameter swivel casters with brake and rubber mounting feet. The larger casters add 1” to unit height. Compressor Hour Meter This option keeps track of the total time that the compressor runs when your Glacier chiller is operating. Special Pumps Special pump options are available for greater pressure and flow rates. One and two pump configurations with 1.5, 3, 5, 7.5, and 10 horsepower pumps are offered. A special high-pressure 10-hp pump is also available.


Figure 1 Glacier NXGA Air-Cooled Chiller Capacities and Specifications

Air in10-30 hp

Airout

5-30 hpAir in

Controller withgraphic panel

ElectricalenclosureB A Allow 6" to 8" for piping

Sight glass

From Process3/4" drain plug

To Process

2.5"-dia. To Processpressure gauge

1"

F

System fill

C

D

E

Glacier Series NXGA Air-Cooled Model Capacities • Nominal operating parameters for Glacier Series NXGA air-cooled models are 50ºF

leaving water temperature at 2.4 gpm per ton with 95ºF ambient air. Nominal cooling capacity Water Com- Nom. Power in amps , 460/3/60

Model tons flow pressor pump Discharge air 1 pump 2 pumps number no pump 1 pump 2 pump gpm hp hp openings cfm rated running rated runningNXGA5 5.03 4.73 4.63 11.4 5 1.5 1 @ 27” 6,000 13.79 12.42 14.69 13.32 NXGA7.5 7.69 7.39 7.29 17.7 7.5 1.5 1 @ 27” 6,000 20.53 17.68 22.33 21.43 NXGA10 9.91 9.61 9.51 23.1 10 1.5 2 @ 27” 12,000 27.93 23.13 29.73 28.83 NXGA15 15.23 14.93 14.83 35.8 15 1.5 2 @ 27” 12,000 35.83 31.13 38.43 37.13 NXGA20 17.07 16.47 16.27 39.5 20 3.0 2, @17.5”x19” 18,000 51.54 44.09 52.99 45.54 NXGA25 21.52 20.92 20.72 50.2 25 3.0 2, @17.5”x19” 18,000 59.64 51.69 62.25 54.30 NXGA30 25.11 24.11 23.71 57.9 30 5.0 2, @17.5”x19” 18,000 67.24 60.84 69.85 63.45

Based on 50ºF chilled water supply temperature and 95ºF ambient air. Optional additional process pump hp reduces chiller capacity by 0.2 tons per hp.

Based on 2.4 gpm per ton, nominal 1 pump. Optional additional process pump hp reduces chiller capacity by 0.2 tons per hp.

Customer use of ductwork requires optional high-pressure fan for 5 hp to 15 hp models. An optional oversized process pump adds to the total rated or running chiller amperage. To find the new total chiller

amperage, subtract the standard process pump amperage from the optional pump amperage (see bottom of Page 4), and add it to the chiller rated or running amperage.

Multiply 460/3/60 amperage by 2.0 for 208-230/3/60 amperages; multiply by 0.8 for 575/3/60 amperages.

Glacier Series NXGA Model Specifications • NXGA portable chillers come standard with 4” swivel casters.

Com- Process connections, in. NPT Dimensions Shipping OperatingModel pressor 1 2 no pump, 1 pump, no in inches weight weight

number hp pump pumps no tank tank, to/from A B C D E F lbs. lbs. NXGA5 5 1.5 2.0 1.5 1.5 / 2.0 65 34 77.5 31.75 9.5 17 1,309 1,502 NXGA7.5 7.5 1.5 2.0 1.5 1.5 / 2.0 65 34 77.5 31.75 9.5 17 1,377 1,570 NXGA10 10 1.5 2.0 1.5 1.5 / 2.0 65 34 77.5 31.75 9.5 17 1,530 1,723 NXGA15 15 2.0 2.5 2.0 2.0 / 3.0 65 34 77.5 32.88 9.5 17 2,108 2,205 NXGA20 20 2.0 2.5 2.0 2.0 / 3.0 78 34 87.5 32.88 9.5 17 2,477 2,671 NXGA25 25 2.0 2.5 2.0 2.0 / 3.0 78 34 87.5 32.88 9.5 17 2,493 2,687 NXGA30 30 2.5 3.0 2.5 2.5 / 3.0 78 34 87.5 34.50 9.5 17 2,782 3,022


Figure 2 Dimensions - Inches

20 to 25 Horsepower Air-Cooled Glacier Chiller A0533703



5 to 15 Horsepower Water-Cooled Glacier Chiller A0533700



20 to 30 Horsepower Water-Cooled Glacier Chiller A0533700


Figure 5 NXGW Series Water-Cooled Chiller Design Specifications

Condenser

Model Number

Cooling Capacity

Chilled Water

Standard Pump

Pipe Size

Total Running Amps

City Water

Tower Approximate Dimensions L X W X H

Approx. Shipping Weight

Tons gpm Hp Inches GPM GPM Inches (Lbs) NXGW5 6 12 1½ 2 27 6 18 65 X 34 X 45 1,400 NXGW7.5 8 18 1½ 2 35 10 24 65 X 34 X 45 1,600 NXGW10 10 24 1½ 2 47 12 31 65 X 34 X 45 1,625 NXGW15 15 36 1½ 2 65 18 45 65 X 34 X 45 1,900 NXGW20 19 45 3 2 79 25 60 78 X 34 X 45 2,100 NXGW25 24 60 3 2 95 30 75 78 X 34 X 45 2,200 NXGW30 27 72 5 2 131 36 90 78 X 34 X 45 2,200 Based on 50°F chilled water supply temperature. Consult factory for other requirements. Flow rate based on 2.4 gpm/ton. Alternate pump selections available. 208-230/3/60 Requirement based on availability of 70°F city water or 85°F tower water at 25 psi minimum. Consult factory for other

conditions.

Table 2

NXGA Series Air-Cooled Chiller Design Specifications

Model Number

Cooling Capacity

Chilled Water

Standard Pump

Pipe Size Total Running Amps

Condenser Air Flow

Approximate Dimensions L X W X H

Approx. Shipping Weight

Tons GPM Hp Inches CFM Inches (Lbs) NXGA5 5 12 1½ 2 30 6,000 65 X 34 X 77 1,300 NXGA7.5 7 18 1½ 2 39 6,000 65 X 34 X 77 2,100 NXGA10 8½ 24 1½ 2 54 12,000 65 X 34 X 77 2,300 NXGA15 13½ 36 1½ 2 72 12,000 65 X 34 X 77 2,400 NXGA20 17½ 45 3 2 105 18,000 78 X 34 X 87 2,450 NXGA25 23 60 3 2 121 18,000 78 X 34 X 87 2,600 Based on 50°F chilled water supply temperature and 95°F ambient air temperature. Consult factory for other requirements. Flow rate based on 2.4 gpm/ton. Alternate pump sizes available. 208 - 230/3/60


- Notes -


2 Shipping Information

2-1 Unpacking and Inspection You should inspect your AEC/Application Engineering Glacier Series portable chiller for possible shipping damage. If the container and packing materials are in re-usable condition, save them for reshipment if necessary. Thoroughly check the equipment for any damage that might have occurred in transit, such as broken or loose wiring and components, loose hardware and mounting screws, etc. In case of breakage, damage, shortage, or incorrect shipment, refer to the following sections. 2-2 In the Event of Shipping Damages

Important! According to the contract terms and conditions of the Carrier,

the responsibility of the Shipper ends at the time and place of shipment. The Carrier then assumes full responsibility of the shipment.

Notify the transportation company’s local agent if you discover damage. Hold the damaged goods and packing material for the examining agent’s inspection. Do not

return any goods to AEC, Inc. before the transportation company inspection and authorization.

File a claim against the transportation company. Substantiate the claim by referring to the agent’s report. A certified copy of our invoice is available upon request. The original Bill of Lading is attached to our original invoice. If the shipment was prepaid, write us for a receipted transportation bill.

Advise AEC, Inc. regarding your wish for replacement and to obtain an RMA (return material authorization) number.

2-3 If the Shipment is Not Complete Check the packing list. The apparent shortage may be intentional. Back-ordered items are noted on the packing list. You should have:

AEC/Application Engineering Glacier Series portable chiller Bill of lading Packing list


Operating and Installation packet Electrical schematic and panel layout drawings Component instruction manuals

Re-inspect the container and packing material to see if you missed any smaller items during unpacking. Determine that the item was not inadvertently taken from the area before you checked in the shipment. Notify AEC, Inc. immediately of the shortage. 2-4 If the Shipment is Not Correct If the shipment is not what you ordered, contact AEC, Inc. immediately. Include the order number and item. Hold the items until you receive shipping instructions. 2-5 Returns

Important! Do not return any damaged or incorrect items

until you receive shipping instructions from AEC, Inc. 2-6 Uncrating Glacier Series portable chillers are shipped mounted on a skid, enclosed in a plastic wrapper, and open-crated on all four sides and top.

1. Pry the crating away from the skid and remove.

2. Use a pry bar to remove the blocks securing the unit to the skid.

3. Lift the unit off the skid with a fork truck.

4. Insert forks between skid and portable chiller from the side until they protrude beyond the opposite side of the unit. The forks must be equidistant from the center line of the unit and the unit must be balanced on the forks.

5. Lift slowly and only high enough to clear the skid. Use a pry bar if necessary to remove the skid from the unit.

6. Lower slowly. The unit will land on its casters and can be rolled into position.

Retain the crating for reshipping the chiller if you find hidden shipping damage.


3 Installation

3-1 Electrical Connections Check serial tag voltage and amperage requirements and make sure your electrical service conforms. Total running amps for Glacier Series Portable Chillers can also be found in the specification tables in Figures 5 and 6. Bring properly sized power leads and ground from a fused disconnect (installed by your electrician) to the unit. Use fusetrons in the disconnect switch, sized according to National Electrical Code recommendations.

! WARNING ! 1. Make sure that electrical connections comply with all applicable

electrical codes. 2. Ground the chiller in accordance with NEC Article 250. 3. Operation voltage must be within plus or minus ten percent

(±10%) of the nameplate rating. 4. Phase imbalance must be below 10%.

3-2 Process Water Connections All Models

All Glacier Series portable chillers have two chilled water connections: • The chilled water supply, labeled TO PROCESS, is the outlet for the chilled water leading

to the process being cooled.

• The chilled water return, labeled FROM PROCESS, is the inlet leading from the process back into the chiller to be cooled and recirculated.


3-3 Water Connection Sizing All external chilled water connections should be run full size to the process (See Figures 5 and 6 on Page 11). The largest possible openings and passages should be provided for the flow of chilled water through platens, dies, molds or other pieces of equipment.

Important! Make sure you reduce any external pressure drop

to the unit as much as possible!

Figure 7 Pump Curves - 60 Cycle


Figure 8 Pump Curves - 50 Cycle


Figure 9 Evaporator GPM-Pressure Drop Curves

A0533716


Figure 10 Condenser GPM-Pressure Drop Curves

A0533717


3-4 Bypass Valve Glacier Series portable chillers have a spring loaded by-pass valve used as a safety feature. If the chilled water shut-off valves are inadvertently closed while the chiller is running, the factory set bypass valve will open and allow a small amount of water to flow through the chiller. This protects the chiller from freeze-up and allows the other safety features to remain effective. The by-pass valve should not be adjusted or tampered with. 3-5 Galvanic Corrosion The materials used in the construction of the water circuit piping of these chillers are partially ferrous (iron) and react electro-chemically with non-ferrous metallic materials such as copper. Some water has dissolved minerals that will greatly accelerate the reaction between dissimilar metals. PVC or ferrous piping is recommended to reduce galvanic action. If you must use copper piping, use dielectric unions at the chiller. 3-6 Water Treatment Water treatment is an integral part of any piping system. In some locations, raw water may be used in the system without problem; in other locations, it results in large deposits of scale and corrosion. AEC, Inc. offers a complete line of water treatment equipment. Contact your AEC, Inc. Sales Representative for water testing and treatment options. 3-7 Water-Cooled Chiller Condenser Water

Connections NXW Series portable chillers can use either city or tower water as a cooling medium. All of the external piping and connections supplying and discharging water to and from the condenser should be full size. Two connections are made to the water cooled condenser:

1. The condenser water supply, labeled CONDENSER WATER IN, is located at the rear of the chiller, and is the inlet for city or tower water.

Water should be supplied at a maximum temperature of 85°F (29°C) and a minimum pressure of 25 psi.


Caution! The water regulating valve is set at the factory.

It should not be adjusted except by a qualified refrigeration technician!

Normal R-22 refrigerant condensing pressure with 85°F (27°C) water at 25 psi entering condenser water pressure is 210 psi.

2. Condenser water return, labeled CONDENSER WATER OUT, is located at the rear of the

chiller, and is the outlet for water after it has passed through the condenser.

It is connected to the tower inlet or to a sewer or other approved discharge receiver. A water regulating valve is a standard feature in the condenser water return line.

3-8 Air-Cooled Condenser Chiller Air Supply Air cooled chillers use the surrounding air to cool the condenser. Install the chiller in an area where there is free passage of air for condensing and provisions for removal of heated air from the area. Do not locate this chiller in locations where steam, hot air or fume exhausts will be drawn into the chiller.

Caution! Clean air-cooled condensers and filters frequently.

Failure to do so results in reduced capacity, increased operating costs, and possible failure of the equipment.

See Section 8-1 on Page xx for cleaning instructions. Normal maximum R-22 refrigerant condensing pressure with 95°F (35°C) air entering the condenser is 260 psi. 3-9 Condensing Air Temperature NXG Series portable chillers are designed to operate at a minimum condenser entering air temperature of approximately 60°F (15.5°C). Operation of the equipment at a lower condenser entering air temperature can cause the low pressure cutout to shut down the unit due to the low refrigerant pressure. It is recommended that the ambient temperature be maintained at 60°F (15.5°C) or above.


Figure 11 Typical Ductwork - Air Cooled Glacier Chiller - 5-15 Horsepower A0533713

Figure 12 Typical Ductwork - Air Cooled Glacier Chiller - 20-25 Horsepower A0533714

3-10 Motor Direction Check Compressors Compressors will run properly in either direction. Water Pumps Correct pump rotation is indicated by a positive pressure of 20 to 30 psi on the pump pressure gauge. Pump rotation should be clockwise when viewed from the motor end. See the following section. On Glacier Series portable chillers with special order oversized pumps, check the appropriate pump curve in Figures 7 and 8 on Page xx. Condenser Fan Air should be drawn through the condenser and discharged vertically from the chiller. See the following section. To change rotation direction:


• Disconnect and lock out power at the fused disconnect.

• Reverse any two motor leads at the power source.

• Do not switch leads at the motor or motor starters.

3-11 Water Reservoir Glacier Series Portable Chillers are shipped with an antifreeze solution to protect against freeze-up damage in transit. The reservoir has a solution of 70% water and 30% ethylene glycol during the summer months and 50% water and 50% ethylene glycol during the winter months. During startup and when additional solution is required, refer to the ethylene glycol curve in Figure 20 on Page xx. Add a pre-mixed solution of industrial quality (not automotive) ethylene glycol (AEC Part No. A0538024) and water to provide freeze protection to a temperature 20°F below normal chiller operating temperature. For corrosion protection, an inhibitor suitable for the protection of the materials in the system should be added. If straight water use is desired, contact the AEC, Inc. Engineering Department.

Caution! Do not connect makeup water directly to the chilled water reservoir

unless you have an approved automatic water makeup system installed.

See Section 3-12 on Page xx for more information. The reservoir is not designed to withstand water pressure in excess of 5 psi. The fill opening and vent line must be vented to the atmosphere for proper operation. The optional automatic make up system is described in Section 3-12 on Page xx. If your application has chilled water or process piping above the reservoir fill and vent level, install a standpipe to a point 1'0" (30 cm) above the highest point in the system.


Installation Note: In applications where the process or process piping is 15 feet (3 m) or more above the reservoir, take steps to prevent over-pressurization of the reservoir.

This condition can occur on system shutdown when the water in the system

drains into the reservoir. To prevent this, install a check valve in the unit TO PROCESS line and a vacuum breaker at the high point of the return FROM PROCESS line. See Figure 13 on the following page for more information.

Figure 13 Central and Gravity Return Piping with Standpipe A0533715

3-12 Automatic Water Makeup Option The Glacier Series Chiller may be connected to an automatic make up system if the optional package (float switch, pressure regulating, pipe fittings, solenoid valve and ½" NPT City Water Make Up connection) is factory installed. Refer to Figure 12 for the additional components necessary for this installation. Your piping must provide backflow protection and prevent over-pressurization of the reservoir.

Caution! • Prevent reservoir over-pressurization by setting the required pressure

regulating valve to limit make up water pressure to less than 5 psi. The reservoir must remain vented to the atmosphere.

• If the automatic make up system is connected to a city water system, make provisions to prevent backflow contamination. Install an approved backflow preventer in accordance with local codes. See Figure 12 (Page 26) for a suggested piping arrangement.

• Adding straight city water into a glycol/water mixture dilutes the solution and eventually leads to system freeze-up. Damage from freeze-up is not covered by the AEC, Inc. warranty!


To prevent system freeze-up in automatic makeup applications, use a system to replenish the glycol. AEC suggests the following methods: Chemical Feeder Use a chemical feeder to meter glycol into the makeup water and to maintain the water/glycol mixture you want. Contact the Application Engineering Sales Department for more information on this equipment. Make Up Reservoir You may mix a glycol/water solution in a tank and use it as a source of makeup fluid. Consult the Application Engineering Sales Department for more information on this piping configuration.

Figure 14 Automatic Makeup Option A0533876


- Notes -


4 Sequence Of Operation

4-1 Chilled Water Circuit Figures 15 to 19

Process cooling water supply and return connections are made at the gate valves provided outside the unit. Warm coolant (water and ethylene glycol mixture) returns from the process and goes into the reservoir tank. The coolant is then pumped through the evaporator where it is cooled. The coolant flows to the process and returns to repeat the cycle. A chilled water bypass valve between the supply line and reservoir tank guarantees a constant flow in the unit during intermittent fluctuating flow conditions. 4-2 Refrigeration Circuit Glacier Series portable chillers are available with either air or water cooled refrigerant condensing. The refrigeration cycles differ only in the way the compressed gas is condensed to a liquid. Liquid refrigerant from the condenser passes through a shutoff valve into a filter/dryer that removes moisture and other contaminants. A refrigerant sight glass is provided. The refrigerant then passes through the thermal expansion valve which allows the refrigerant to expand and cool the inside of the heat exchanger. The refrigerant flows through the suction accumulator into the compressor. The refrigerant gives up its heat as it re-condenses to a liquid in the condenser. A hot gas bypass valve is used to control cooling capacity during intermittent or partial load conditions. This feature contributes substantially to chiller longevity by eliminating excessive cycling of the compressor and providing close temperature control.


Figure 15 Piping Schematic, One Pump Chiller A0533704


Figure 16 Piping Schematic, Two Pump Chiller A0533705


Figure 17 Piping Schematic, One Pump - No Tank A0533718


Figure 18 Piping Schematic, Two Pump - No Tank A0533719


Figure 19 Piping Schematic, No Pump - No Tank A0530720


4-3 Freezestat Control The freezestat is a safety feature that shuts down the compressor if the chilled water temperature approaches the freezing point. The chilled water pump continues to run. The freezestat cutout temperature is factory-set at 40°F (4°C). This is correct for a supply water temperature of 50°F (10°C) - the rated capacity operating temperature. If you want lower chilled water temperatures, mix process water with antifreeze to provide protection down to 20°F (11°C) below the operating temperature you want. See Figure 21 on Page xx for more information. You can then reset the freezestat cut out temperature to a temperature 10°F (6°C) below the operating temperature you want.

Caution! Allow only a qualified refrigeration service technician to adjust the freezestat.

Your AEC, Inc. product warranty does not cover system freeze-ups! 4-4 Crankcase Heater Glacier Series portable chillers have a crankcase heater wired through the control transformer that operates continuously whenever you apply power to the chiller.

Caution! Energize the crankcase heater for at least 24 hours before initial startup

to drive dissolved refrigerant from compressor oil.

Failure to do so damages the compressor! 4-5 High Pressure Cutout This electro-mechanical safety feature opens the control circuit if the system condensing pressure exceeds 350 psi.

Important! The high pressure cutout is a manual reset control.

Call a refrigeration service technician to analyze the problem and to reset the control.


Figure 20 Freezing Point Curve


4-6 Low Pressure Cutout This electro-mechanical safety feature prevents the evaporator temperature from dropping below a pre-set point. It is factory set to open the control circuit at 32 psi for R-22. This permits 20°F (-7°C) operation with a 70% water, 30% ethylene glycol coolant mixture. This control automatically resets when the refrigerant pressure reaches 50 psi. 4-7 Oil Pressure Safety Switch This safety feature is a differential pressure switch that monitors crankcase oil pressure. If the pressure should drop to an unsafe level for more than two minutes, the switch will open the control circuit.

Important! The oil pressure safety switch is a manual reset control.

Call a refrigeration service technician to analyze the problem and to reset the control.

4-8 Fan Cycling Switch Air-Cooled Models Only

NXGA-5 and NXGA-7.5 Models These models have one fan. The fan cycling switch turns on the fan when the condenser pressure reaches 275 psi and turns it off when the pressure drops below 200 psi. NXGA-10 through NXGA-25 Models These models have two fans (NXGA-10 & NXGA-15) or two blowers (NXGA-20 & NXGA-25). One turns on every time the compressor operates. The fan cycling switch turns on the second fan when the condenser pressure reaches 275 psi and turns it off when the pressure drops below 200 psi. NXGA-10 Through NXGA-25 Models with the Optional Fan Cycling Switch Glacier Series portable chillers may be supplied with an optional fan cycling switch for applications with low ambient air temperatures. This switch cycles the second fan or blower ON and OFF to maintain efficient condensing pressures.


If the optional fan cycling switches are installed, the primary fan or blower turns on at 250 psi, and off at 200 psi. The second fan or blower cycles on at 275 psi and off at 225 psi. 4-9 Float Switch This safety feature shuts down the system if the water in the reservoir falls below a safe level. Pump cavitation and freeze- up would otherwise occur. 4-10 Remote Start/Stop Interlock An additional contact is provided to allow the remote starting or stopping of the Glacier Chiller from a remote location. To use this feature, remove the jumper between terminals X1 and 1 on TB2. Supply a switch or dry contact interlock connected in series between these two terminals. Refer to the schematic glued inside the control enclosure door or the typical schematics in Figures 22 and 23.


5 Startup Checklists

5-1 Introduction Follow the check lists below for the start-up of your new chiller. These lists assume the installation information elsewhere in this manual has been read and followed. New chillers should be started up and checked by a qualified refrigeration service technician. 5-2 Water-Cooled Glacier Chiller Startup Checklist

Check the shipping papers against the serial tag to be sure chiller size, type and voltage is correct for the process that will be controlled.

Check the transformer primary voltage connections to be sure they are configured for the electrical power used. The voltage at the main power connection must be within +/-10% of the voltage on the serial tag. Electrical connections must conform to all applicable codes.

The chilled water To-Process and From-Process connections should be completed. The chilled water supply valve on the chiller must be open. Be sure the reservoir tank and chilled water circuit piping are filled to the full mark with a

water/glycol mixture. The water/glycol mixture should provide for freeze protection to at least 20°F below the desired leaving water temperature.

The tower or city condenser-cooling WATER IN and WATER OUT connections should be completed and an adequate supply of condenser water must be available.

Connect the main power to the unit and bump-start it to check for proper rotation direction. See Section 3-10. The crankcase heater should be ON for at least 24 hours before start up to force dissolved refrigerant gas from the compressor oil.

Check your work and proceed to Start-Up, Section 5-2.

5-3 Starting Up Water-Cooled Glacier Chillers

1. Turn ON the chiller and put it under a process load.

2. Set the NX control to the process temperature you want by pressing the Up or Down arrow buttons behind the access door on the NX control.

3. Adjust the freezestat cutout dial, located in the electrical enclosure, to 10°F below the process temperature you want.

4. Check the pump amp draw and pump pressure. The amp draw reading must be within the running load and service factor amps.


5. Operate the chiller, looking for leaks and listening for unusual noises or vibrations that could indicate improper operation.

5-4 Air-Cooled Glacier Series Startup Checklist

Check the shipping papers against the serial tag to be sure chiller size, type and voltage is correct for the process that will be controlled.

Check the transformer primary voltage connections to be sure they are configured for the electrical power you are using. The voltage at the main power connection must read within plus or minus ten percent (±10%) of the voltage listed on the serial tag. Electrical connections must conform to all applicable codes.

Complete chilled water TO PROCESS and FROM PROCESS connections. The chilled water supply valve on the chiller must be open. Be sure the reservoir tank and chilled water circuit piping are filled to the full mark with a

water/glycol mixture. The water/glycol mixture should provide for freeze protection to at least 20°F below the leaving water temperature you want.

The air cooled condenser should have an adequate supply of air for proper operation. Connect the main power to the unit and bump-start it to check for proper rotation direction of

fans and pump. See Section 3-10. The crankcase heater should be ON for at least 24 hours before start-up to force dissolved refrigerant gas from the compressor oil.

Check your work and proceed to Section 5-5 below.

5-5 Starting Up Air-Cooled Glacier Series Chillers

1. Turn ON the chiller and put it under a process load.

2. Set the NX control to the desired process temperature, using the up or down arrow buttons behind the door on the NX control.

3. Adjust the Freezestat Cut-Out dial, located in the electrical enclosure, to 10°F below the desired process temperature.

4. Check the pump amp draw and pump pressure. The amp draw reading must be within the running load and service factor amps.

5. Operate the chiller, looking for any leaks and listening for unusual noises or vibrations that could indicate improper operation.


Figure 21 The NX Control A0533724


- Notes -


6 Operation

6-1 Introduction Standard Glacier chillers use a microprocessor based PID controller. The controller is a modular, self-contained unit that can slide from its mounting housing. It is factory set and adjusted; no field adjustment to the internal controls is necessary.

NXGA & NXGW Control Operation Range Standard Models 20°F to 65°F

Low Temp Models 0°F to 30°F 6-2 LED Indicators PV or Process Value Numeric LED During normal operation, this large red LED on the control displays the actual process temperature at the To Process thermocouple. It also lists parameters during setup and error messages if an error occurs. SV or Set Value Numeric LED During normal operation, this green LED on the control displays the process set point you want the chiller to maintain. It also displays parameter and pre-set function values during setup.

Figure 22 Microprocessor Control


OUT or Output LED This orange LED lights when the control output energizes the hot gas bypass valve. RMT or Remote LED This lights when remote operation occurs on chillers equipped with optional communications. SHIFT LED This orange LED is not used. AT or Auto-Tune LED This orange LED flashes during the Auto-Tune sequence. ALM1 or Alarm 1 LED This red LED lights when the process temperature is two degrees [2°F] or more above the setpoint. The compressor will turn on and run until the temperature at the To-Process thermocouple is two degrees below the setpoint. This +2°F control point is factory set for proper compressor operation. Changing the control point is not recommended without consulting the AEC/Application Engineering. ALM2 or Alarm 2 LED The ALM 2 red LED lights whenever the temperature at the To Process thermocouple drops 2°F below the process set point. This red LED lights when the process temperature is two degrees (2°F) or more below the set point. The compressor is shut down until the process temperature at the To Process thermocouple is 2°F above the set point. This control point is factory-set for proper compressor operation. Changing the control point is not recommended without consulting AEC/Application Engineering. 6-3 Temperature Controller Keys Level Key This key is not used during normal operation. It is used during control programming only.

RMT or Remote Key This key is on controls with optional communications. For information on RS-232C, RS-422, or RS-485 communications, refer to the Communications Manual (AEC Part No. A0535959). For RS-232C units with the SPI CPC protocol converter, see the specific O&I Manual (AEC Part No. A0536527).


Mode Key This button toggles the green LED display between the set point, the upper alarm (AL1), and the lower alarm (AL2). When the control is powered up, the green LED displays the set point Press this button once and the red LED displays AL 1 and the green LED displays the upper alarm setting. Press again and the red LED displays AL 2 and the green LED displays the lower alarm setting. Press a third time and the control display returns to Normal mode, displaying the process set point and process temperature.

Caution! Use this button to display alarm settings only.

Do not change alarm limits without consulting AEC/Application Engineering!

Down Key The key with the arrows pointing down lowers the process water set point temperature.

Up Key The key with the arrows pointing up raises the process water set point temperature.

AT Key This key initiates the auto-tune function. See Section 7-5 on Page XX for more information. 6-4 Setting Process Water Temperature To change the process water temperature set point:

• Press the Up button to raise the set point.

• Press the Down Button to lower the set point.


6-5 Auto-Tuning Glacier Chillers Auto-tune fine tunes the control's PID to process requirements. Auto-tune whenever the process under control changes. Don't be alarmed by the control's response. It may take the process temperature above and below the set points as many as three times. It will then level off and control to the process set point. Auto-tuning can take up to 30 minutes, and is best done before any product is being run. To auto-tune the controller:

• Press and hold down the AT key for several seconds until the AT indicator flashes.

The AT LED flashes to indicate that the control is tuning itself.

When the AT LED light stops flashing, the controller is tuned and ready for operation. 6-6 Optional Communications Standard Protocol

For RS-232C, RS-422, and RS-485 communications, a connection port on the cabinet permits hookup to the host. The connection port is a direct pin-to-pin extension from the plug on the back of the temperature controller. For pin outs, consult the control module communication manual (AEC Part No. A0535959). SPI Protocol

A connection port on the electrical cabinet permits easy hookup to an SPI network. For complete information, refer to the AEC, Inc. Communication Protocol Converter manual (AEC Part No. A05365273).


7 Graphic Panel

7-1 Low Water Level Light This indicator lights and the chiller shuts down when the float switch in the reservoir senses that the water/glycol level has dropped below an acceptable level. Add enough water/glycol mixture to fill the tank to the operating level, or check the operation of the automatic water makeup if one is installed. Use a mix that provides freeze protection to at least 20°F below the process temperature. 7-2 High Refrigerant Pressure Light This indicator lights if the condensing pressure exceeds 350 psi. The compressor stops and the pump continues to run until you manually reset the high pressure cut out. Call a qualified refrigeration service technician or contact the Application Engineering Service Department for service. 7-3 Low Refrigerant Pressure Light This indicator lights if the refrigerant pressure drops below a safe level. The compressor stops and the pump continues to run. The indicator turns off and compressor restarts automatically when the refrigerant pressure reaches 50 psi.


Figure 23 Typical Graphic Panel A0533723


7-4 Freezestat Light This indicator lights if the chilled water temperature drops below the Freezestat setting. This prevents possible system freeze-up. The compressor will shut off and the chilled water pump will continue to operate.

Caution! Your AEC, Inc. warranty does not cover damage from system freeze-up.

Make sure the freezestat is set properly to prevent freeze-up! 7-5 Low Oil Pressure Light This indicator light, installed on chillers with 15 horsepower compressors and larger, lights if compressor oil pressure drops to a dangerous level. After two minutes of low oil pressure, the compressor will shut down. This is a manual reset control. Call a qualified refrigeration service technician or the Application Engineering Service Department for repairs. 7-6 Power Light This indicator lights whenever the power switch is in the ON position and the control circuit is energized. Note: The crankcase heater is energized whenever main power is applied to the chiller. The

position of the power switch does not affect the operation of the crankcase heater. 7-7 Hot-Gas Bypass Light This indicator lights when the hot-gas bypass valve is in operation. The "OUT" LED on the NX Controller will also light when the hot-gas bypass valve is in operation. 7-8 Compressor Light This indicator lights whenever the compressor is operating.


7-9 Pump Light This indicator, installed on chillers with pumps, lights whenever the pump(s) operate.

Figure 24 Typical Subpanel Layout


Figure 25 Typical Air Cooled Glacier Chiller Electrical Schematic A0534353


Figure 26 Typical Water Cooled Glacier Chiller

Electrical Schematic A0534368


8 Routine Maintenance

8-1 Lubrication Quarterly

Grease all fan bearings, fan motors, and pump motors that do not have permanently sealed bearings. Remove grease relief plug (motors only) before adding grease. Failure to do so may result in dislodging the bearing grease retainer which will eventually cause bearing failure. Compressors are hermetically sealed and no oiling is required. 8-2 Filter Cleaning Air Cooled Models

Filter cleaning is important to keep your Glacier Series Air Cooled Portable Chiller operating at peak capacity. Clean them whenever they are dirty. To clean, slide the filter from its mount and hose down with clean water. If the dirt is heavy, use a mild detergent and rinse well. Allow the filter to dry completely before replacing it on the chiller. Note: AEC recommends keeping a spare filter on hand. Install and use it when cleaning the

other filter.

Caution! Do not use compressed air to blow off a dirty filter.

You won’t clean it very well, and you could damage it, too!

NEVER RUN THE CHILLER WITHOUT PROPERLY-INSTALLED FILTERS!


8-3 Condenser Maintenance Dirty condenser heat exchange surfaces reduce system capacity. Air-Cooled Chillers

Brush or vacuum light dirt accumulations. Avoid bending or damaging the fins. Heavy soil accumulations on the coil require professional steam cleaning, so attempting to wash the condenser from the outside will only make matters worse. Water-Cooled Remove dirt in the condenser tubes with a nylon tube brush. Remove mineral deposits by circulating AEC Liquid De-Scaling Solution (AEC Part No. A0502600) through the water side of the condenser. Follow the directions on the container. The refrigerant side is sealed and requires no routine maintenance. 8-4 Preventive Maintenance Service A systematic preventive maintenance program helps avoid costly down time. Call the AEC/ Application Engineering Service Department to arrange a schedule of inspections. This service, described in Bulletin No. 10-106.3, can be tailored to fit your maintenance requirements. These inspections include:

Checking refrigerant suction and discharge pressures Checking safety and operating conditions Checking voltage and amperage of all motors Checking all electrical connections Checking quantity of refrigerant Checking compressor oil level Checking lubrication of motor and pump bearings. Checking circulating pump operation Checking flow through heat exchangers Checking compressor efficiency Checking noise levels Checking cleanliness of equipment area


9 Troubleshooting

Problem Possible cause Solution Unit does not run. No power. Check main disconnect,

fuses, wiring, and power lead to unit.

Wrong voltage supplied to unit.

Voltage must be within plus or minus 10% of nameplate rating.

Defective on/off switch. Replace. Control circuit fuse blown. Replace control circuit fuse. Check transformer. Check crankcase heater. Defective control transformer. Replace. Reservoir float switch circuit

open. Add anti-freeze solution as required to bring liquid level up to normal.

Pump motor off on overload. Reset and test. Pump runs; compressor does not.

Freeze control set higher than temperature of liquid in system.

Lower freeze control set to 10°F (12°C) below desired leaving temperature.

Defective freezestat. Replace. Low refrigerant. Check refrigerant charge. Refrigerant low pressure

switch contacts open. Sight glass should be clear while compressor runs. Call for service if bubbling or foaming occurs.

Refrigerant high pressure Clean the air filters. cutout switch contacts open. Check condenser fans for

proper rotation. Check for dirty condenser. Check for condenser air

obstruction. Fan motor out on overload. Reset and test. Defective fan cycling control. Replace. Defective fan motor. Repair or replace. Compressor internal overload

open. Allow time to cool and reset, then check for high/low voltage. It must be within plus or minus 10% of the nameplate rating.

Check for poor compressor electrical connections.


Problem Possible cause Solution Pump runs; compressor does not (cont’d.)

Compressor contactor holding coil open.

Repair or replace.

Defective pump motor to compressor interlock control circuit.

Repair or replace.

Broken wire in the compressor control circuit.

Locate and repair.

Pump runs, compressor cycles at short intervals.

Freeze control setting too high.

Lower set point to 10°F below desired leaving water temperature.

Water temperature is too high.

Antifreeze mixture inadequate for process.

Make sure that the antifreeze mixture protection is right for the process.

Defective or improperly-set freezestat.

Adjust or replace.

Refrigerant low pressure switch is set too high.

Call service to adjust pressure control.

Refrigerant charge is low. Call service to find and repair the leak, then have refrigerant added.

Pump pressure low (refer to curves for normal pressure for various pumps).

Pump running in reverse. Verify rotation; if running in reverse rotation, reverse any two main power leads. Re-verify for correct pump rotation.

Check for foreign matter. Clean the system. Pump pressure is too high. Restricted water flow. Check for partially closed

valves etc. Make sure that all lines are properly sized.

Unit runs continuously, but Restricted condenser air. Clean filters. not enough cooling power. Clean condenser. Unit low on refrigerant. Check the refrigerant charge. Compressor not operating

efficiently. Call service.

Unit under-sized for application.

Call sales rep.


Service Notes

Technical Assistance

Parts Department Call toll-free 7am–5pm CST [800] 423-3183 or call [847] 273-7700, Fax [847] 273-7812 The ACS Customer Service Group will provide your company with genuine OEM quality parts manufactured to engineering design specifications, which will maximize your equipment’s performance and efficiency. To assist in expediting your phone or fax order, please have the model and serial number of your unit when you contact us. A customer replacement parts list is included in this manual for your convenience. ACS welcomes inquiries on all your parts needs and is dedicated to providing excellent customer service.

Service Department Call toll-free 8am–5pm CST [800] 233-4819 or call [847] 273-7700 Emergencies after 5pm CST, call [847] 439-5655 We have a qualified service department ready to help. Service contracts are available for most products.

Sales Department Call [847] 273-7700 Monday–Friday, 8am–5pm CST Our products are sold by a world-wide network of independent sales representatives. Contact our Sales Department for the name of the sales representative nearest you.

Contract Department Call [847] 273-7700 Monday–Friday, 8am–5pm CST Let us install your system. The Contract Department offers any or all of these services: project planning; system packages including drawings; equipment, labor, and construction materials; and union or non-union installations.