please take a moment to answer the following questions...

SATS ModulAIR Series7 –20 Ton "MCS" Vertical Floor Mounted Precision Control Air

Conditioners

Product Guide Specification

***************************************************************************************************************This section must be carefully reviewed and edited by the Engineer to meet the requirements of the specific project. Coordinate with other specification sections and the drawings as necessary.***************************************************************************************************************

1.1 Summary

This specification describes requirements for a precision environmental control system. The ModulAIR “MCS” vertical floor-mounted air conditioning system shall provide precision temperature and/or humidity control for computer rooms or rooms containing telecommunications or other highly-sensitive heat load equipment where continuous 24 hour a day, 365 days a year air conditioning is required. Designed for front-only access, “MCS” systems require minimum floor space. The units are designed with a wide range of options to handle both precision and comfort cooling applications.

The supplied system shall be labeled in accordance to UL 1995 Standard, and MEA NYC approved (MEA-163-88-E) (CSA if applicable) listings.

The system model number shall be ________________________.

1.2 DESIGN REQUIREMENTS

The environmental control system shall be an SATS ModulAIR factory-assembled unit. The unit shall be designed for corner installation, requiring front only access through a hinged and removable front access panel. The electric box shall hinge outward allowing for front only access to all components. No allowance for side service access shall be required, however removable side access panels shall be provided for additional access. On direct expansion models, the refrigeration system shall be split with a matching outdoor air-cooled condenser, or with the compressor located in a remote or close-coupled condensing unit.

The evaporator section shall be specifically designed for high sensible heat ratio. The heat exchanger shall be propeller fan (for outdoor installation) or centrifugal fan (for indoor installation).

Each system shall be capable of handling _______CFM (L/S) at ________inches (mm) of water external static pressure with (up discharge front return air flow, down discharge top return air flow, up discharge rear return air flow pattern. The unit shall have the cooling capacity of ________ Btu/hr (kW) and the sensible cooling capacity of ________Btu/hr (kW), based on entering air condition of ___________°F (°C) dry bulb and _______°F (°C) wet bulb. The humidifier shall have the capacity of __________lb/hr (kg/hr.). Reheat shall have a capacity of ________ Btu/hr (kW). The main fan motor(s) shall be ______HP (kW).

The unit shall have a power supply of ________ volts, ________ phase, ______Hz.

1572 Tilco Drive Frederick, Maryland 21704 USAPhone: 301-620-2033 Fax: 301-662-5487 www.stulz-ats.com

QG-MQS0047Rev -

of 16

http://www.stulz-ats.com/

1.3 SUBMITTALS

A submittal shall be provided with the proposal and shall include:Single-line DiagramDimensional, electrical, and capacity data; andPiping and electrical connection drawings.

1.4 QUALITY ASSURANCE

ModulAIR systems are designed and built using only quality components. Every unit passes through 10 quality assurance inspection stations. Each person involved with the welding, assembly, piping, wiring, testing, and final cleanup and crating initials their work. After final cleanup, the units are again inspected by our quality supervisor to ensure that the system received is in top condition. Each system is subject to a complete operational and functional test procedure at the factory.

2.0 PRODUCT

2.1 Cabinet and Frame Construction

The cabinet and access panels shall be fabricated from 16 gauge galvanized steel and painted with a 2-ply epoxy finish to match and provide corrosion protection. The panels shall be lined with 1/2" (13 mm), 2 lb (.90 kg), high-density sound and thermal insulation and sealed with self-extinguishing gasketing conforming to NFPA 90A and 90B. The main unit color shall be ____________________.

2.2 Electric System

2.2.1 Modular Motor Controllers

The systems shall incorporate modular motor controllers utilizing motor start protectors and circuit breakers to eliminate the need for fuses. All wiring shall be in accordance with the National Electric Code (NEC) and shall include:

* Motor branch circuit short circuit protection;* Motor load switching controllers (contactors) and* Motor overload protection.

The control circuit shall be a 24 VAC Class II low voltage circuit, including primary and secondary circuit protection. Low voltage, high voltage, and common wires shall be color-coded and shall be individually numbered at each end for ease of service tracing. All wiring shall be in accordance with the National Electric Code (NEC).

2.2.2 Remote Stop / Start Contacts

Included in the system’s electrical control circuit shall be a 2 –pin terminal connection for remote stop/start of the ModulAIR air conditioner by remote source.

2.2.3 Main Power-Electric Non-Fused Disconnect Switch


QG-MQS0047Rev -

of 16


The unit mounted main power disconnect switch factory provided, is as standard. The disconnect switch shall be dust-proof, non-fused type with a lockable handle.

2.3 Direct Expansion System

2.3.1 A-Frame Coils

The system shall be configured for a draw-thru air pattern to provide uniform air distribution over the coil face. The coils shall be an A-Frame (3 to 5 ton) design to provide maximum coil surface area and minimum depth to provide a high sensible cooling capacity. The coils shall be seamless drawn copper tubes, mechanically bonded to tempered aluminum fins with a raised lanced fin design for maximum heat transfer. Coil end plates shall be hot dipped galvanized steel. The evaporator coil shall be mounted in an insulated UL-94-V-O polymeric or stainless steel condensate drain, depending upon COS model size

The evaporator coil shall have a _______ft² (m²) face area and be _______rows deep. It shall be constructed of copper tubes and aluminum fins and have a maximum face velocity of ______ft/min (m/s) at _______CFM (L/S). Refrigerant flow shall be controlled by an externally equalized thermostatic expansion valve.

2.3.2 Refrigeration System

All refrigerant piping shall be refrigerant grade tubing. Each refrigeration circuit shall include, as a minimum a refrigerant drier/strainer sight glass with moisture detector, a thermal expansion valve with rapid bleed port feature and external equalizer, an evaporator coil, a compressor, a high pressure switch with manual reset, and a low pressure switch with automatic reset.

Split/Remote systems shall have a liquid line solenoid for refrigerant isolation to prevent liquid slugging. All high-pressure joints shall be brazed, and the entire system shall be pressure tested at the factory with dry nitrogen, evacuated to at least 50 microns and fully charged with refrigerant.

2.3.3 Scroll Compressor

The compressor shall be high efficiency, high reliability and low noise scroll compressor(s). The compressor shall be complete with charging and service shraeder ports, internal vibration isolation, internal thermal overloads, an internal pressure relief valve, an internal discharge gas vibration eliminator, and external vibration mounting isolation.

2.4 Fan Section

2.4.1 Belt Driven Systems

The blower(s) shall be belt driven with a double-width, double-inlet housing and forward-curved blades and permanently lubricated ball bearings sized for an average 100,000 hours of service life. The blower(s) shall be dynamically and statically balanced to minimize vibration and operate in the Class 1 range. The blower(s) shall be corrosion protected with a painted housing and impeller wheel. The blower(s) shall have an adjustable base for belt tensioning and a locking system to prevent the motors from moving. The motor’s drive sheave shall have an adjustable


QG-MQS0047Rev -

of 16


pitch to change the speed of the blowers. The motor(s) shall be 1725 rpm and shall have overload protection and a minimum NEMA service factor of 1.15.

The fan motor shall be _____________hp(kW) at 1750 rpm.

2.5 Advanced Microprocessor Temperature and Humidity Control

The standard ModulAiR “MCS” floor A/C includes the A-Tech-20 Microprocessor Controller, Electrode Canister Humidifier and Dehumidification Mode with Electric Reheat/ Heat providing precision temperature and humidity control.

2.5.1.1 Display Key Pad

The Display Key Pad shall feature an easy to read, 4 Row x 20 Character liquid-crystal alpha-numerical display. The attractive remote mounted (standard) keypad/display, allows the operator to visually monitor and customize unit functions and settings. The self-explanatory, keypad nomenclature shall aid in the ease of location of system programming features.

The performing of simple functions such as adjusting the Temperature or Humidity set point are made obvious:

Press TEMP SETPT or HUMID SETPT, ARROW UP or DOWN to adjust & press ENTER to accept.

2.5.1.3 Field Configurable

The A-Tech-20 controller is field program configurable and capable of matching the unique needs of any data center, telecommunication or other critical area.

2.5.1.4 Display Location

The A-Tech-20 keypad/display shall be unit mounted as the standard.

2.5.1.5 Sensor Location

The A-Tech-20 temperature and humidity sensor shall be return air, unit mounted as a standard. A remote wall mounted sensor is also available to ship loose. A 75 ft. remote sensor interconnect cable shall be provided as a standard with the A-Tech-20 remote sensor option.

2.5.1.7 System Setup & Adjustments

The A-Tech-20 shall be completely factory preprogrammed, and therefore, most applications will require no field setup. However, the “default” set points and their ranges are easily adjusted from A-Tech-20 kepad/display.

The system shall be supplied with the following factory preprogrammed and field adjustable default settings:

2.5.1.7.1 Temp/Humid Control:Temp Set Point 72°F DBHumidity Set Point 50% RH


QG-MQS0047Rev -

of 16


Heat/Cool Dead-Band 2°F DBHumid/Dehumid Dead-Band 5% RHInter-stage Differential 1°F DB

2.5.1.7.2 Alarms:High Temp Alarm 80°F DBLow Temp Alarm 60°F DBHigh Humid Alarm 70% RHLow Humid Alarm 30% RH

2.5.1.7.3 Compressor Short Cycle:Cold-Start Time Delay 3 minMinimum ON Time 2 minMinimum OFF Time 4 min

2.5.1.8 Unit Status DisplayThe A-Tech-20 keypad displays current unit functions and room status:• Current Dry Bulb Temp Set Point• Current Relative Humidity Set Point

2.5.1.9 Current Unit Status• System ON/OFF • Free Cooling• Cooling • AWS Cooling• Heating • Compr. Lock-Out• Humidifying • Capacity Assist• Dehumidifying • Standby Mode• Reheating • Manual Mode• Actual Room DB Temperature• Actual Room Relative Humidity

2.5.1.10 Run Times

The historical run-time in hours of the following major components shall be available directly from the A-Tech-20 keypad/display: (if applicable)

• Evaporator Blower Motor• Compressor• Humidifier• Chilled Water Valve• Free-Cooling Valve• Alternate Water Source Valve

2.5.1.12 Alarm Conditions

Alarm conditions activate an audible and visual indicator. An alarm shall be acknowledged through an Alarm Mute button located on the keypad display.

The A-Tech-20 alerts to the following alarm conditions (if applicable):

• High Temperature • Dirty Filter


QG-MQS0047Rev -

of 16


• Low Temperature • Smoke Detection• High Humidity • Firestat• Low Humidity • Leak Detection• High Head Press • GC Pump Failure• Low Suction Press • Sensor Failure• Loss of Air Flow • Comm. Failure

The operator may select which alarms are active or inactive.

2.5.1.13 Summary Alarm Contact

A summary alarm dry-contact (n/o) connection shall be available for remote annunciation of an alarm condition. An additional user-defined Custom alarm dry-contact shall also be available on most system configurations.

2.5.1.14 Alarm History

The A-Tech-20 controller provides users with a recorded history of the last 25 alarms, including the time and date of the alarm.

2.5.1.15 Control Inputs/Outputs

The A-Tech-20 is capable of both digital (on/off) and analog (proportional integral, PI) input and output device control. Prior to shipment, each CyberONE unit's A-Tech-20 is factory program configured to match the unit's system operational requirements.

2.5.1.15.1 Digital (On/Off) Outputs

• 2(two) Cool• 2(two) Reheat/Heat (3rd opt.)• 1(one) Humidification2.5.1.15.2 Analog (0-10 VDC) Outputs

• 1(one) Cool• 1(one) Reheating/Heat or 1(one) Humidification

2.5.1.16 Temperature Anticipation

The A-Tech-20 shall incorporate a self-calibrating and self-adjusting control logic that adjusts the response of the SATS air conditioner to changes in temperature and humidity. The system shall provide premium setpoint accuracy while controlling the room conditions rate of change, minimizing the equipment energy consumption and maximizing the system’s operating life and reliability.

2.5.1.17 Power Loss Restart

In the event of a loss of power to the system, the A-Tech-20 can be configured for Automatic or Manual Restart. The A-Tech-20's non-volatile memory enables the system to restart when power is restored, without the loss of the "last" stored set points and other system configuration settings.


QG-MQS0047Rev -

of 16


2.5.1.17.1 Sequential Load Activation

To minimize the total in rush current loads during system startup/restart, the A-Tech-20 controller shall be configured for time-delay sequence startup. The user can designate specific unit restart time-delays, as well as, each unit's respective compressor, electric heater and/or humidifier. Unit restart delay can be adjusted from 0 to 10 minutes. Unit compressor, electric heater and/or humidifier restart delay can be adjusted from 0 to 60 seconds.

2.5.1.17.2 Recovery Delay

After a power loss, the A-Tech-20's Recovery Delay feature allows the A/C to operate without initiating any high or low temperature or humidity alarms for a delayed period. This feature allows the A/C time (15 to 60 minutes adj.) to "pull-down" the conditioned space's load without nuisance alarms during initial startup or power loss restart.

2.5.1.18 Compressor Operations

2.5.1.18.1 Short Cycle Protection

Each compressor shall be protected from frequent compressor cycling through the A-Tech-20's minimum compressor ON and minimum compressor OFF short cycle timers.

72.5.1.18.2 Cold Start Time Delay

Each compressor of a DX Split system shall be protected from liquid slugging through the A-Tech-20's Cold Start compressor time delay. The Cold Start timer delays, and therefore, overrides the system's refrigerant low suction pressure switch during system startup. This allows the system time to build sufficient discharge pressure during cold weather startup.

2.5.1.18.3 Pump-Down Cycle

The A-Tech-20 shall be pre-programmed for a one-time refrigerant system pump-down cycle upon compressor shutdown on all split DX systems. This assists in the prevention of liquid slugging at startup/restart.

2.5.1.19 Security

Multiple security levels prevent unauthorized adjustment of critical system parameters. The user may select a four-digit password for setpoint and configuration changes.

2.5.1.19.1 Keypad Lockout

The A-Tech-20 includes a selectable Keypad Lock-Out feature that prevents unauthorized users from making changes to system setpoints and settings available directly from the multi-function keypad/display. Keypad Lock-Out eliminates the need for stat-guards.

2.5.1.20 Diagnostic & Service Mode


QG-MQS0047Rev -

of 16


The A-Tech-20 shall incorporate a unique self-diagnostics algorithm that continually tests systems functions and hardware operation. In the event of such a failure, the user will be alerted to the condition via a visual and audible alarm.

2.5.1.20.1 Control Board

The Control Board shall initiate a self-test of the control system.

2.5.1.20.2 Input Diagnostics

All system inputs and output devices shall be continuously monitored for proper operation.

2.5.1.20.3 Output Diagnostics

(Service Mode)Major component functionality can be tested by manually turning components ON and OFF from the A-Tech-20 control panel. Select outputs devices that can be manually tested include (if applicable):

• Compressor 1 or 2 • CW Valve• Blower Motor • HW Valve• Humidifier • FC Valve• Heat 1, 2 or 3 stgs • AWS Valve• Summary Alarm • Liq-Line Solenoid• Custom Alarm 1 • GC Pump Enable

2.5.1.21 Time Clock & Night Set-back

The A-Tech-20 shall include both Time Clock and Night Set-Back occupied/non-occupied energy saving modes. These features enable the user to customize each unit's daily 5-day/weekly and 2-day/weekend operational scheduled.

2.5.1.21.1 Time Clock Feature

The Time-Clock feature enables the user to create an automatic time schedule for the unit to be allowed ON. Typically, the Time-Clock 5-2 day schedule limits unit operation to occupied periods only.

2.5.1.21.2 Night Set-Back Feature

The Night Set-Back features enables the user to create a schedule for automatic relaxing of the units temperature and humidity control set points. For example, during the space occupied periods of 7am to 6pm, the unit operates at a temperature setpoint of 72°F. Then, during the space unoccupied periods of 6pm to 7am the next morning, the temperature setpoint automatically "relaxes" to 77°F. The Set-Back schedule resets again after 7am that morning where the temperature setpoint changes back to 72°F for Day Time Operation.

2.5.1.21.3 Override Feature


QG-MQS0047Rev -

of 16


During the unoccupied time cycles, the user can temporarily "override" the Time-Clock and/or Set-Back features. The user can override these functions for a timed duration of 1 to 6 hours.

2.5.1.22 Cyber Networking Options

2.5.1.22.1 CyberLAN – Multi-Unit “N+1” Sequencing (Optional)Critical control applications shall incorporate the A-Tech-20's Cyber-LAN multi-unit sequencing program logic. Under an A/C failure condition the A-Tech-20 will automatically initiate the unit operation of a designated standby/backup unit, as well as, locally and remotely alert the alarm condition.

2.5.1.22.2 Multi-Unit Sequencing (Optional)Multiple ModulAiR air conditioners incorporating A-Tech-20 controls shall be configured in groups of up to quantity 6(six) units to allow for "N+1" redundancy/backup critical application operation.

The "N" in N+1, represents the number of concurrent units in an On-Line Operational Mode with quantity 1(one) unit in a standby mode. The value of "N" shall range from 1 unit to a maximum of 5 units with a minimum and maximum of 1 unit in standby mode.

To allow for equal unit runtime and/or to ensure unit operation, the A-Tech-20 shall be configured for automatic timed and/or manual lead-lag of standby unit operation.

The CyberLAN Multi-Unit Sequencing control logic shall automatically initiate the current standby unit upon a user selectable system failure alarm condition.

The A-Tech-20 is programmed to automatically change from current primary unit operation to secondary standby unit operation via three methods:

1) Manual ChangeOver2) Automatic Timed (1-30 days)3) Automatic ChangeOver on Unit

Failure (if applicable):

• High Temperature • Loss of Air Flow• Low Temperature • Dirty Filter• High Humidity • Leak Detection• Low Humidity • Smoke Detection• High Head Press • Firestat• Low Suction Press • GC Pump Failure• Sensor Failure • Comm. Failure

Factory defaults set a "logical" active/inactive state for the alarms. This is done to limit "nuisance" type alarms that may occur because of conditions inherent to a particular application or system and that are not critical to the operation of the system. (For example: If Low Humidity is not critical to a particular application, and therefore, the A/C unit is not equipped with a Humidifier, the Low Humidity Alarm can be set to an inactive state.) As standard, qty. N x 75 ft. interconnect cables shall be provided for "N+1" number of units in a CyberLAN Multi-Unit Group. 150 ft. cables are optionally available.

2.5.1.22.3 Capacity-Assist Mode


QG-MQS0047Rev -

of 16


In addition to switchover via manual, automatic timed or failure, the CyberLAN Multi-Unit Sequencing “Capacity Assist-Mode” shall initiate switchover to standby unit operation to assist in the temperature and/or humidity control of the space.

2.5.1.22.4 Sequence of Operation

The optional Capacity Assist Mode shall include quantity one remote wall mounted Capacity Assist-Mode T/H Sensor with 75 ft. interconnect cable. This single capacity assist remote T/H sensor controls all N+1 units in the respective CyberLAN Group. To establish a single point of control reference, the CyberLAN Group’s temperature and humidity set point is determined by the Master Unit’s (U1’s) A-Tech-20 setpoints. Therefore, each of the current on-line units of the Cyber-LAN Group operate and control space temperature and/or humidity based on the Master Unit’s (U1’s) TEMP and HUMID SETPT in respect to their individual deadband, and/or PI Control settings.

The current standby unit is enabled when the actual space temperature or humidity rises or falls to a condition equal to the Master Unit’s (U1’s) setpoint plus dead-band plus Inter-stage differential (if appl.) plus Capacity Assist Differential.

2.5.1.22.4.1 Capacity Assist Mode

Each unit of a CyberLAN Group, incorporating Capacity Assist Mode, shall include its own standard unit mounted return air T/H sensor. If the Capacity Assist Sensor or its communications cable were to fail, Multi-Unit & Capacity Assist Mode operations will be automatically disabled, and the N+1 Units will perform as stand-alone systems.

2.5.1.23 CyberLAN Remote Communications (Optional)

2.5.1.23.1 Remote BMS Connection (ModBus Gateway)

A-Tech-20 Inputs & Outputs shall be remotely monitored (address readable) and remotely controlled (address writable) via any building management system (BMS) / local area network (LAN) control system that can communicate via a ModBus protocol. Each A-Tech-20 configured for BMS communication shall incorporate an optional Serial Communication Port that is field connected to a factory provided wall mounted ModBus Gateway. The units of a CyberLAN ModBus Group must be connected to each other and then to the ModBus Gateway via sheilded serial twisted-pair cabling. This cabling is not included in SATS' CyberLAN Remote Communications / ModBus Gateway option, as a standard. This cabling is typically provided by the installing contractor. A list of the addressable I/Os are available upon request from your local SATS Sales Representative.

2.5.1.23.2 16 Units Per CyberLAN ModBus

Each ModBus Gateway shall accommodate up to 16 (sixteen) A/C units in a group.

The units of a respective ModBus Gateway Group are daisy-chained together with one of the units connected directly to the ModBus Gateway. The total number of Gateways required for a given application will depend not only on the number of maximum (16) units each Gateway can accommodate, but also the space layout.


QG-MQS0047Rev -

of 16


2.6. Humidity Control

2.6.1 Canister Steam Humidification

The humidifier shall be an electrode steam canister type and shall have an adjustable humidity output setting from 25 to 100% of the full rated humidifier capacity. The humidifier shall have an automatic flush cycle that senses the current consumption of the humidifier and controls mineral concentration of the water. A “Change Cylinder” light shall notify service personnel when the humidification output is below rated requirements and when maintenance is due.

2.7 Dehumidification Cycle

The floor A/C shall provide refrigeration-based dehumidification mode. Moisture is condensed on the cooling coil and discharged through the condensate drain. Reheat (electric, hot gas, steam, or hot water) shall be provided to offset sensible cooling during the dehumidification cycle.

2.7.1 Finned Tubular Electric Reheat

A factory mounted and wired low-watt density, plated fin-tubular design electric resistance heater shall be included to provide automatic sensible re-heating as required during the dehumidification cycle and automatic heating mode. Electric heaters shall be provided with miniature thermal/magnetic circuit breakers, which shall protect each ungrounded conductor. Also included will be one automatic reset and one manual reset over-temperature safety device (pilot duty).

2.8 Air Pattern (select one)

2.8.1 Top “Ducted” Discharge with:

* Front “Free” Return; or* Rear “Ducted” Return;

(A 1.0" Flanged duct connection shall be provided as a standard).

2.8.1.2 Top Discharge Through two or three-way Grille Plenum Box with:

* Front “Free” Return; or* Rear “Ducted” Return;

2.8.2 Down-Flow:

The air conditioner shall be configured for a down-flow air pattern with free evaporator return air to the top and conditioned supply air discharge through bottom of the A/C into the raised floor.

The A/C shall have slide out, 2" deep, class 2 (per U.L. Standard 900) filters. The filters shall be easily accessed through a front access door. The filters shall have an efficiency rating of at least, 30% dust-spot as measured by ASHRAE Standard 52-76 test method.

2.9 Filter Chamber


QG-MQS0047Rev -

of 16


The filter chamber shall be an integral part of the unit, located within the cabinet and serviceable from the front of the unit for both up-and down-flow configuration.

The A/C shall have a slide out, 2" deep, class 2 (per U.L. Standard 900) filter. The filter shall be easily accessed through the front, hinged access door. 2.10 Standard Features / Individual Systems

2.10.1 Air Cooled

The air-cooled system shall consist of the following:1. Split air cooled with remote outdoor condenser;2. Split air cooled with remote indoor centrifugal-type condenser;3. Split air handling unit with remote outdoor propeller-type condensing unit; or4. Split air-handling unit with remote indoor centrifugal-type condensing unit.

2.10.1.1 Remote Outdoor Propeller Condenser

The system shall be a remote outdoor air cooled condenser with direct-driven propeller fan(s). The condenser cabinet shall be of aluminum construction and contain copper tubes and aluminum fins. The condenser cabinet shall house the condenser coil, direct-drive propeller fan(s) and TEFC fan motor(s), and NEMA 3R condenser motor control/enabling box. The compressor(s) shall be located with the MCS-( )-AR evaporator section. The condenser shall be sized to provide the total heat rejection of the system at 95°F ambient temperature for the corresponding model MCS-( )-AR ModulAIR evaporator unit. The following head pressure control features are offered:

* HES-( )-LSA : Low ambient head pressure control down to a minimum ambient temperature of -20°F via variable fan speed head pressure control.

* HES-( )-LFA : Low ambient head pressure control down to a minimum ambient temperature of -30°F via flooded head pressure control.

2.10.1.2 Remote Indoor Centrifugal Condenser

The system shall be a remote indoor, ceiling mounted, air cooled condenser with centrifugal blower. The condenser cabinet shall be of aluminum construction and contain copper tubes and aluminum fins. The condenser cabinet shall house the condenser coil, blower and blower motor, receivers (if applicable), and condenser motor control/enabling box. The compressor(s) shall be located with the MCS-( )-AR evaporator section. The condenser shall be sized to provide the total heat rejection of the system at 95°F ambient temperature for the corresponding model MCS-( )-AR evaporator unit. The following head pressure control features are offered.

* HES-( )-CAA : Low ambient head pressure control down to a minimum ambient temperature of 0°F via fan speed head pressure control.

* HES-( )-CAA : Low ambient head pressure control down to a minimum ambient temperature of -30°F via flooded head pressure control.

2.11 Water Cooled Systems


QG-MQS0047Rev -

of 16


2.11.1 Integral Coaxial Water Condensers

The water-cooled condenser shall be an integral coaxial type with a factory installed head pressure water-regulating valve. The unit shall have a total heat of rejection of _________Btu/hr (kW), require _______gpm (l/s) of ____________°F (°C) water, and have a maximum pressure drop of _________ft. (kpa.)

2.11.2 Head Pressure Control

Each refrigerant circuit’s head pressure shall be controlled by a factory-installed two-way water regulating valve rated for 150 psig. w.w.p.

2.12 Glycol-Cooled Systems

2.12.1 Integral Coaxial Glycol Condensers

The glycol cooled condenser shall be an integral coaxial type with a factory-installed head pressure glycol regulating valve. The unit shall have total heat of rejection _________Btu/hr (kW), require _______gpm (l/s) of _________°F (°C) water, and have a maximum pressure drop of __________ft. (kpa.)

2.12.2 Head Pressure Control

Each refrigerant circuit’s head pressure shall be controlled by a factory installed two-way glycol regulating valve rated for 150 psig. w.w.p.

2.13 Chilled Water System Components

2.13.1 Chilled Water Cooling Coil

The cooling coil shall have a ____________ft2 (m2) face area and be 4 rows deep. The coil shall be constructed of seamless drawn copper tubes, mechanically bonded to tempered aluminum fins with a raised lance fin design for maximum heat transfer, and mounted in a stainless steel condensate drain pan. The coil shall be designed for under 500 ft/min face velocity. The water circuit shall be designed to distribute water into the entire coil face area. The coil shall be supplied with _____°F (°C) entering water temperature with a __________°F (°C) rise. The coil shall be supplied with _________gpm (l/s) of chilled water and pressure drop shall not exceed ______psi (kPa).

2.13.2 Chilled Water Control

The water circuit shall include a three-way modulating (0-10 vdc) valve. Design pressure shall be 300 psig (1035 kpa). Two-way or three-way 400 psig (1724 kpa) shall be provided as an option.

2.14 Optional Equipment / All Systems

2.14.1 Remote Mounted A-Tech-20 Controller Display


QG-MQS0047Rev -

of 16


Remote mounting of the A-TECH-20 key pad display is optional. A 30 ft. interconnecting communications cable with easy plug-in connectors shall be factory provided standard with remote A-TECH-20 display option.

2.14.2 Hot Gas Reheat

A factory piped and wired hot gas reheat valve shall be provided to divert the hot compressor discharge gas from the condenser to the hot gas reheat coil during the dehumidification cycle. This energy saving feature shall require no additional energy and is able to offset all of the sensible cooling capacity of the system.

2.14.3 Steam / Hot Water Heat / Reheat

A factory installed copper tube aluminum fin heat/reheat coil and two-way solenoid valve shall be provided to control the flow of steam/hot water for heating the leaving air.

2.14.4 SCR Fired Heat / Reheat, Proportional Temperature Control

The electric heat/reheat shall be controlled through a “Zero firing” Silicon Controlled Rectifier (SCR) with an excluded aluminum heat sink and solid state logic systems to provide close control of the conditioned air temperature.

2.14.5 High Static Pressure Belt-Drive Systems (Up To 2.0" e.s.p)

The ModulAIR floor A/C shall be provided with a high static pressure belt-driven evaporator blower to provide ________CFM @ _______ achieve high static pressure up to 2" e.s.p.

2.14.6 High Efficiency Filtration (Up to 99% Dust Spot Efficiency)

Ducted ModulAIR A/C’s are available with optional high efficiency IAQ-conscious filtration system. These filters include 2" and 4" pleated , bag and hepa filters. ____” (mm) deep______type_____% Dust Spot Efficiency.

2.15 Head Pressure Control ( Low Ambient Control)

2.15.1 AIR COOLED – Low Ambient

2.15.1.1 0°F, Fan Cycling / Fan Speed Control (Model HES-()-LAA Condenser)

The air cooled system shall incorporate a low ambient fan cycling/fan speed head pressure control for year-round A/C system operation down to 0°F DB minimum ambient air temperature.

2.15.1.12 -20°F, Variable Fan Speed Control (Model HES-()-LSA Condenser)

The air cooled system shall incorporate a low ambient variable speed fan head pressure control for year-round A/C system operation down to -20°F DB minimum ambient air temperature.

2.15.1.13 -30°F, Flooded Control (Model HES-()-LFA Condenser)


QG-MQS0047Rev -

of 16


The air cooled system shall incorporate a low ambient flooded head pressure control for year-round A/C system operation down to -30°F DB minimum ambient air temperature. This option shall include a factory installed crankcase heater, cold-start relay, liquid refrigerant receiver with receiver liquid level sight glass and head pressure regulating valve for flooded condenser option.

2.15.2 Water / Glycol Systems

2.15.2.1 Two-Way, 350 psig Regulating Valve

Each refrigerant circuit’s head pressure shall be controlled by a factory installed, High Pressure two-way water /glycol regulating valve rated for 350 psig. w.w.p.

2.15.2.2 Three-Way, Head Pressure Regulating Valve

Each refrigerant circuit’s head pressure shall be controlled by a factory supplied and field installed:

* 3-Way, 150 psig w.w.p. head pressure valve: or* 3-Way, 350 psig w.w.p. head pressure valve.

2.16 DX - Capacity Modulation/Freeze -Protection

2.16.1 Snap-Acting, Hot Gas Bypass (Models Available COS-( )-AR, W & G)

The ModulAIR floor A/C units shall incorporate a hot gas bypass system to provide modulation of the unit’s cooling capacity. This options shall also provide evaporator coil freeze protection under low load conditions. The Snap-Acting system is only available on those systems where the compressor is located in the evaporator section.

2.17 High Pressure Chilled Water Control Valves

2.17.1

2-Way, 400 psig w.w.p. chilled water modulating valve shall be factory piped andwired. The valve shall automatically meter the flow of chilled water to the cooling coil in response to a proportional signal (0-10 vdc) provided to the valve by the A-Tech-20 proportional controller.

2.17.2

3-Way, 400 psig w.w.p. chilled water modulating valve shall be factory piped andwired. The valve shall automatically meter the flow of chilled water to the cooling coil in response to a proportional signal (0-10 vdc) providedto the valve by the A-Tech-20 proportional controller. If the cooling demandfalls below the system’s maximum cooling capacity, the superfluous coolant shall be diverted back to the chilled water source.

2.18 Accessories

2.18.1 Top Discharge Plenum Box (Upflow Units Only)


QG-MQS0047Rev -

of 16


A 2 or 3-way plenum discharge box shall be provided. The plenum box shall include double –deflecting, adjustable grilles.

2.18.2 Adjustable Floor Stand:

An adjustable floor stand shall be provided to allow for ease of installation of the CyberONE COS A/C onto a raised floor. Floor stand height shall be adjustable (8" to 24") and shall be field installed.

2.18.3 Condensate Pump

The condensate pump shall have the capacity of ______gpm (l/s) at _______ft (kPa) of head. The condensate pump shall be specifically designed to operate with the higher condensate temperatures caused by the flush and drain cycle of the electrode canister humdifiers.

2.18.4 Smoke Detection

An ionized smoke detector shall be factory installed and wired in the evaporator section of the suction side of the evaporator blower. The air conditioner will shut down upon sensing smoke in the return air stream.

2.18.5 Firestat

The air conditioner shall be provided with a factory wired and mounted firestat. The firestat will shut down the air conditioner upon sensing a high return air temperature.

2.18.6 Remote Water Detector

A remote single point water/leak detector shall be included to provide additional safety to the standard condensate pan safety float switch. Upon sensing a water leak, the normally closed water detector control circuit opens, which will cause the air conditioner to shut down.

2.18.7 Remote Water Detector – Strip Type

A 20 ft. in length remote strip/cable type water/leak detector shall be provided for remote field installation. In addition to the 20 ft. sensing cable, a 24 volt water detector power module shall require field mounting and wiring to the factory provided terminal connection. Upon sensing a water leak, the normally closed water detector control circuit shall open, thereby shutting down the CyberTWO unit’s water producing components.


QG-MQS0047Rev -

of 16


please take a moment to answer the following questions...

Documents