product data · 2013-12-31 · product data a05307 unit 48du ... { rated in accordance with u.s....

1

48DU/48DUNInfinityt 14 Single---Packaged Air Conditioner and Gas FurnaceSystem with Puron® (R---410A) Refrigerant2 to 5 Nominal Tons (024---060)

Product Data

A05307

Unit 48DU

Single--Packaged Products with Energy--Saving Features andPuron® refrigerant.

S Direct Spark Ignition

S 14 SEER

S Up to 80.1% AFUE

S Low Sound Levels

S Variable--Speed Blower (Standard)

S Factory Installed TXV

S Stainless Steel Heat Exchanger (Limited LifetimeWarranty)

S Two Stage Cooling and Heating

FEATURES/BENEFITSOne--piece heating and cooling units with low sound levels, easyinstallation, low maintenance, and dependable performance.

Puron® Environmentally--Sound Refrigerant is Carrier’sunique refrigerant designed to help protect the environment.Puron refrigerant is an HFC refrigerant which does not containchlorine that can harm the ozone layer. The most importantadvantage of Puron refrigerant is that it has not been banned infuture air conditioning systems as the traditional refrigerant R--22

has been. Puron refrigerant is in service in over 100,000 systemsproving highly reliable, environmentally sound performance.

IdealHumidityt Technology featuring Infinityt control andVariable--Speed Blower motor and two--stages of cooling andheating provide greater comfort, humidity control, and energyefficiency.

Variable--Speed Blower motors provide better comfort andenergy efficiency. You can expect up to 30 times betterdehumidification; economical constant fan for less than $50 ayear, which provides improved indoor air quality and more eventemperatures from room to room; and reduced indoor noise dueto lower air velocity. In addition, you’ll realize improvedinstallation flexibility with 3 different airflow choices for bestoverall comfort.

Easy installationFactory--assembled package is a compact, fully self--contained,combination gas heating/electric cooling unit that is pre--wired,pre--piped, and pre--charged for minimum installation expense.These units are available in a variety of standard and optionalheating/cooling size combinations. Units are lightweight andinstall easily on a rooftop or at ground level. The high techcomposite unit base eliminates rust problems associated withground level applications.

Convertible duct configurationUnit is designed for easy use in either downflow or horizontalapplications. Each unit is easily converted from horizontal todownflow with the two standard duct covers.

Efficient operationHigh--efficiency design with SEERs (Seasonal Energy EfficiencyRatio) of 14.0 and AFUE (Annual Fuel Utilization Efficiency)ratings as high at 80.1%.

Energy--saving, direct spark ignition saves gas by operatingonly when the room thermostat calls for heating. Standard unitsare furnished with natural gas controls. A low--cost field installedkit for propane conversion is available for all units.

48DUN units are dedicated Low NOx units designed forCalifornia installations. These models meet the Californiamaximum oxides of nitrogen (NOx) emissions requirement of 40nanograms/joule or less as shipped from the factory and MUSTbe installed in California Air Quality Management Districts orany other location where a Low NOx rule exists.

Durable, dependable componentsCompressors have two stages of cooling and are designed forhigh efficiency. Each compressor is hermetically sealed againstcontamination to help promote longer life and dependableoperation. Vibration isolation provides quiet operation.Compressors have internal high--pressure and overcurrentprotection.

2

Monoport inshot burners produce precise air--to--gas mixture,which provides for clean and efficient combustion. The largemonoport on the inshot (or injection type) burners seldom, ifever, requires cleaning. All gas furnace components are accessiblein one compartment.

Turbo--tubulart heat exchangers are constructed of 409stainless steel for corrosion resistance and optimum heat transferfor improved efficiency. The tubular design permits hot gases tomake multiple passes across the path of the supply air.

In addition, dimples located on the heat exchanger walls force thehot gases to stay in close contact with the walls, improving heattransfer.

Direct--drive, variable--speed blower motor is standard on all48DU models.

Direct--drive, PSC condenser fan motors are designed to helpreduce energy consumption and provide for cooling operationdown to 55°F outdoor temperature. Low--ambient cooling isavailable below 55°F when low--ambient cooling is enabled inthe User Interface (UI). Motormaster® II low--ambient kit is notrequired.

Infinityt User Interface is designed to work as a system withCarrier’s single--packaged product.

Refrigerant system is designed to provide dependability. Liquidrefrigerant filter driers are used to promote clean, unrestrictedoperation. Each unit leaves the factory with a full Puronrefrigerant charge. Refrigerant service connections make checkingoperating pressures easier.

Thermostatic Expansion Valve—A hard--shutoff, balance portTXV maintains a constant superheat at the evaporator exit(cooling cycle) resulting in higher overall system efficiency.

High-- and Low--Pressure Switches give added safety andreliability to the compressor.

Indoor and outdoor coils are computer designed for optimumheat transfer and cooling efficiency. The indoor coil is fabricatedfrom copper tube and aluminum fins and is located inside the unitfor protection against damage. The outdoor coil is internallymounted on the top tier of the unit. Copper fin coils andpre--coated fin coils are available from the factory by specialorder. These coils are recommended in applications wherealuminum fins are likely to be damaged due to corrosion. Theyare ideal for seacoast applications.

Low sound ratings ensure a quiet indoor and outdoorenvironment with sound ratings as low as 75 dB. (See page 4.)

Easy to service cabinets provide easy single--panel accessibilityto serviceable components during maintenance and installation.The basepan, with integrated drain pan, provides easy groundlevel installation with or without a mounting pad. Convenienthandholds are provided to manipulate the unit on the job site. Anesting feature ensures a positive basepan to roof curb seal whenthe unit is roof mounted. A convenient 3/4--in. wide perimeterflange makes frame mounting on a rooftop easy.

Warranty—The 48DU heat exchangers come with a LimitedWarranty for lifetime of original owner in single family residence;15 years in other residential and commercial applications.Five--year limited warranty on entire unit. Contact your dealer fordetails.

Standard metal duct covers with insulation come with the unitand cover the horizontal duct openings. These can be left in placeif the units are converted to downflow.

Downflow operation is easily provided in the field to allowvertical ductwork connections. The basepan utilizes knockoutstyle seals on the bottom openings to ensure a positive seal in thehorizontal airflow mode.

Infinity Furnace Control board provides safe and efficientcontrol of heating and simplifies trouble--shooting through itsbuilt--in diagnostic function.

Heating

S Reliable direct spark ignition system

S Two--speed PSC inducer motor with ball bearings

S Low stage heating delivers 65% of high--stage capacity

Cabinets are constructed of heavy--duty, phosphated,zinc--coated, pre--painted steel capable of withstanding 500 hrs ofsalt spray. Interior surfaces of the evaporator and electric heatercompartments are insulated with foil--faced insulation, whichkeeps the conditioned air from being affected by the outdoorambient temperature and provides improved indoor air quality.(Conforms to American Society of Heating, Refrigeration and AirConditioning Engineers No. 62P.) The sloped drain panminimizes standing water in the unit, which is provided with anexternal drain.

Louvered grille provides hail and vandalism protection for thecoil.

TABLE OF CONTENTSFEATURES/BENEFITS 1--2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .MODEL NUMBER NOMENCLATURE 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ARI CAPACITIES 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .PHYSICAL DATA 5--6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OPTIONS AND ACCESSORIES 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .BASE UNIT DIMENSIONS 8--9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ACCESSORY DIMENSIONS 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .SELECTION PROCEDURE 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .PERFORMANCE DATA 12--18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TYPICAL PIPING AND WIRING 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .APPLICATION DATA 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ELECTRICAL DATA 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TYPICAL WIRING SCHEMATIC 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CONTROLS 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .GUIDE SPECIFICATIONS 23--24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

48DU

3

MODEL NUMBER NOMENCLATURE

48DU 024

Model No48DU – Single Packaged

Gas/Electr ic Unit

Low NOx Indicator- StandardN Low NOx

Nominal Cooling Capacity

024 – 2.0 Tons030 – 2.5 Tons036 – 3.0 Tons042 – 3.5 Tons048 – 4.0 Tons060 – 5.0 Tons

040

Heat Input Size (Btuh)

040 – 40,000060 – 60,000090 – 90,000115 – 115,000130 – 130,000LEGEND

AL — AluminumCU — Copper

- 3 -Options

BT - AL evap, vinyl condenserCC - AL evap, CU condenserCU - CU evap & condenserTP - Base unit with tin plated indoor coil hairpinsTV - TP with vinyl coating on outdoor coilTC - TP with AL indoor coil & CU/CU outdoor coil

Only used if ordering an option

Electrical Supply

3 – 208/230-1-605 – 208/230-3-60

48DU

4

ARI* CAPACITIESCooling Capacities, Efficiencies and Sound Ratings

Unit 48DU Nominal Tons Standard CFM(High / Low Stage)

Net CoolingCapacities (Btuh)(High / Low Stage)

EER@A** SEER† Sound Ratings‡

(dBA)

024040024060

2 800 / 600 22,600 / 17,600 11 14.0 75

030040030060

2--1/2 1000 / 700 28,600 / 21,400 11 14.0 75

036060036090

3 1200 / 850 34,600 / 24,400 11 14.0 75

042060042090

3--1/2 1400 / 975 40,500 / 29,000 11 14.0 78

048090048115048130

4 1600 / 1100 46,000 / 33,400 11 14.0 78

060090060115060130

5 1750 / 1200 57,000 / 40,500 11 14.0 78

Heating Capacities and Efficiencies

Unit 48DU Heating Input (Btuh)High/Low

Output Capacity(Btuh)

High / Low

Temperature RiseRange

High (°F)

Temperature RiseRange

Low (°F)AFUE

024040030040

40,000 / 26,000 32,000 / 20,400 20--50 15--45 78

024060030060036060042060

60,000 / 39,000 48,000 / 30,800 25--55 25--55 78.6

036090042090048090060090

90,000 / 58,500 72,000 / 46,400 35--65 35--65 79.2

048115060115

115,000 / 75,000 93,000 / 60,300 30--60 30--60 80.1

048130060130

130,000 / 84,500 105,000 / 67,700 35--65 35--65 80.0

LEGENDdBA—Sound Levels (decibels)db—Dry BulbSEER—Seasonal Energy Efficiency Ratiowb—Wet BulbCOP—Coefficient of PerformanceHSPF—Heating Season Performance Factor* Air Conditioning & Refrigeration Institute.** ”A” conditions---80°F indoor db/67°F indoor wb & 95°F outdoor db.{ Rated in accordance with U.S. Government DOE Department of Energy) test procedures and/or ARI Standards 210/240---94.} Tested in accordance with ARI Standard 270---95 (not listed in ARI).Notes:1. Ratings are net values, reflecting the effects of circulating fan heat. Ratings are based on:Cooling Standard: 80°F db, 67°F wb indoor entering air temperature and 95°F db outdoor entering air temperature.2. Before purchasing this appliance, read important energy cost and efficiency information available from your retailer.

REGISTERED

ISO 9001:2000

48DU

5

PHYSICAL DATAUNIT SIZE 024040 024060 030040 030060 036060 036090 042060 042090NOMINAL CAPACITY (ton) 2 2 2---1/2 2---1/2 3 3 3---1/2 3---1/2OPERATING WEIGHT (lb.) 396 401 403 408 485 493 507 515COMPRESSORSQuantity

2---Stage Scroll1

REFRIGERANT: PURON (R---410A)Quantity (lb.) 10.1 10.1 11.3 11.3 9.5 9.5 13.8 13.8

REFRIGERANT METERING DEVICE TXVSize 2 Ton 2 Ton 3 Ton 3 Ton 3 Ton 3 Ton 4 Ton 4 TonPart Number EA36YD129 EA36YD129 EA36YD139 EA36YD139 EA36YD139 EA36YD139 EA36YD149 EA36YD149OUTDOOR COILRows...Fins/in.Face Area (sq ft)

2...2113.6

2...2113.6

2...2115.3

2...2115.3

2...2117.5

2...2117.5

2...2119.4

2...2119.4

OUTDOOR FANNominal CfmDiameter (in.)Motor Hp (Rpm)

270022

1/8 (825)

270022

1/8 (825)

270022

1/8 (825)

270022

1/8 (825)

280022

1/8 (825)

280022

1/8 (825)

280022

1/8 (825)

280022

1/8 (825)INDOOR COILRows...Fins/in.Face Area (sq ft)

3...173.7

3...173.7

3...173.7

3...173.7

3...174.7

3...174.7

3...174.7

3...174.7

INDOOR FANNominal Airflow (Cfm)Comfort Variable based on Comfort Roll back (see User Interface instructions for more information).Efficiency 700 700 875 875 1050 1050 1225 1225Max 800 800 1000 1000 1200 1200 1400 1400Furnace (gas ht.) airflow---Low Stage 475 727 475 727 745 875 745 875Furnace (gas ht.) airflow---High Stage 844 1120 844 1120 1120 1410 1120 1410Size (in.) 10x10 10x10 10x10 10x10 11x10 11x10 11x10 11x10Motor HP (RPM) 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4FURNACE SECTION*Burner Orifice No. (Qty...Drill Size)Natural Gas 2...44 3...44 2...44 3...44 3...44 3...38 3...44 3...38HIGH---PRESSURE SWITCH (psig)Cut---outReset (Auto)

670 ±10470 ± 25

HIGH---PRESSURE SWITCH 2 (psig)(Compressor Solenoid)Cut---outReset (Auto)

565 ± 15455 ± 15

LOSS---OF---CHARGE /LOW---PRESSURE SWITCH(Liquid Line) (psig)Cut---outReset (auto)

25 ± 555 ± 5

RETURN---AIR FILTERS (in.)†Throwaway 20x24x1 20x24x1 20x24x1 20x24x1 24x30x1 24x30x1 24x36x1 24x36x1

Continued next page.

48DU

6

PHYSICAL DATA CONTINUEDUNIT SIZE 048090 048115 048130 060090 060115 060130NOMINAL CAPACITY (ton) 4 4 4 5 5 5

OPERATING WEIGHT (lb.) 521 521 521 572 572 572

COMPRESSORSQuantity

2--Stage Scroll1

REFRIGERANT: PURON (R--410A)Quantity (lb.)

15.3 15.3 15.3 15.8 15.8 15.8

REFRIGERANT METERING DEVICE TXV

Size 4 Ton 4 Ton 4 Ton 5 Ton 5 Ton 5 Ton

Part Number EA36YD149 EA36YD149 EA36YD149 EA36YD159 EA36YD159 EA36YD159

OUTDOOR FANNominal CfmDiameter (in.)Motor Hp (Rpm)

330022

1/4 (1100)

330022

1/4 (1100)

330022

1/4 (1100)

330022

1/3 (1110)

330022

1/3 (1110)

330022

1/3 (1110)

OUTDOOR COILRows...Fins/in.Face Area (sq ft)

2...2119.4

2...2119.4

2...2119.4

2...2123.3

2...2123.3

2...2123.3

INDOOR COILRows...Fins/in.Face Area (sq ft)

3...175.7

3...175.7

3...175.7

4...175.7

4...175.7

4...175.7

INDOOR FANNominal Airflow (Cfm)

Comfort Variable based on Comfort Roll back (see User Interface instructions for more information).Efficiency 1400 1400 1400 1750 1750 1750Max 1600 1600 1600 2000 2000 2000Furnace (gas ht.) airflow---Low Stage 815 1215 1255 845 1215 1255Furnace (gas ht.) airflow---High Stage 1385 1885 1875 1300 1910 1920Size (In.) 11x10 11x10 11x10 11x10 11x10 11x10Motor HP (RPM) 3/4 3/4 3/4 1 1 1

FURNACE SECTION*Burner Orifice No. (Qty...Drill Size)

Natural Gas 3...38 3...33 3...31 3...38 3...33 3...31

HIGH--PRESSURE SWITCH (psig)Cut--outReset (Auto)

670 ± 10470 ± 25

HIGH--PRESSURE SWITCH 2 (psig)(Compressor Solenoid)

Cut--outReset (Auto)

565 ± 15455 ± 15

LOSS--OF--CHARGE /LOW--PRESSURE SWITCH

(Liquid Line) (psig)Cut--outReset (auto)

25 ± 555 ± 5

RETURN--AIR FILTERS (in.)†Throwaway

24x36x1 24x36x1 24x36x1 24x36x1 24x36x1 24x36x1

*Based on altitude of 0 to 2000 ft.{ Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of 300 ft/minute for throwaway type or 450 ft/minute for high--capacity type. Air filter pressure drop for non--standard filters must not exceed 0.08 in. wg.

OUTDOOR SOUND: OCTAVE BAND DATA—DECIBELS (dBA)MODEL NO. 48DU

Frequency (Hz) 024 030 036 042 048 060125 58.8 58.8 60.7 56.7 62.4 63.5

250 63.5 63.5 63.3 62.8 69.9 67.6

500 67.2 67.2 66.8 67.8 71.3 71.8

1000 66.9 66.9 66.5 67.4 73.4 75.5

2000 63.7 63.7 64.2 63.7 70.0 71.0

4000 58.3 58.3 60.3 57.7 66.3 68.1

8000 50.0 50.0 53.0 50.8 60.1 59.9

48DU

7

OPTIONS AND ACCESSORIESFactory--installed optionsCoil options include tin--plated* indoor hairpins, copper/copperand vinyl--coated construction for refrigerant coils. Units areshipped standard with copper tube/aluminum fin construction.See model number nomenclature for coil options.

*Tin--plated indoor coils are built with special hairpins that aredesigned to resist both general pitting corrosion and excessiveindoor corrosion (Formicary Corrosion).

Field--installed accessoriesManual Air Damper (25% open)

Filter Rack

Flat Roof Curbs (8--in. and 14--in.)

Square--to--Round Duct Transition Kit

Infinityt User InterfaceCrankcase Heater

LP to Natural Conversion Kit

LP High Altitude Kit (2001 to 6000 ft)

LP Standard Altitude Kit (0 to 2000 ft)

Lifting Kit

Compressor Hard Start Kit (for use on single--phase units only)

Manual outside air damper includes hood and filter rack withadjustable damper blade for up to 25% outdoor air.

Flat roof curbs in both 8 in. and 14 in. sizes are available forroof mounted applications.

FILTER RACK

EVAPORATORCOIL

TOP FILTER RACK

BEND FLANGE AT 90°-SCREW TODIVIDER WITH 1-IN. SCREW

BOTTOM FILTERRACK

Square--to--round duct transition kit enables 024--048 sizeunits to be fitted to 14 in. round ductwork.

Compressor hard start kit assists compressor start--up byproviding additional starting torque on single--phase units andprolongs compressor motor life.

Infinity User Interface coupled with the system’s variable--speedindoor blower delivers Carrier’s patented IdealHumiditytechnology that allows for even greater humidity control. Alongwith more precisely controlling temperature and humidity, theInfinity User Interface offers full seven--day programmabilityallowing you to further customize your comfort and energysavings.

Lifting kit includes 4 metal brackets that are available to assist inlifting this product onto a roof application.

LP (liquid propane) conversion kit allows for conversion fromnatural gas to liquid propane fuel.

High altitude kit is for use at 2001 to 6000 ft above sea level.Kit consists of LPgas orifices that compensate for gas heatoperation at high altitude.

LP to natural gas conversion kit allows conversion back tonatural gas.

Crankcase heater provides anti--floodback protection forlow--load cooling applications.

Filter rack features easy installation, serviceability, andhigh--filtering performance for vertical or horizontal applications.

MANUAL OUTSIDE AIR DAMPER

DAMPERBLADE

MANUAL OUTSIDEAIR HOOD

REPLACEMENTPANEL

48DU

8

A06323

48DU024--030

UnitDimensions

48DU

9

A06324

48DU036--060

UnitDimensions

48DU

10

ACCESSORY DIMENSIONS

Gask et aroundouter edge

Insulateddeck pan

Gask et aroundduct

S/AR/A

HVAC unitbase

*Gask etingouter flange

Flashing fieldsupplied

Roofing materialfield supplied

Cant str ipfield supplied

*Provided with roof curb

Roof

Ductworkfield supplied

Insulation (fieldsupplied)

Roof curb*

Wood nailer*

Gask etinginner flange*

Scre w(NO TE A)

Roof Curb for Small Cabinet

Note A: When unit mounting scre w is used,retainer bra cke t must also be used.

HVAC unitbase

*Gask etingouter flange

Flashing fieldsupplied

Roofing materialfield supplied

Cant str ipfield supplied

*Provided with roof curb

Roof

Ductworkfield supplied

Insulation (fieldsupplied)

Roof curb*

Wood nailer*

Gask etinginner flange*

Scre w(NOTE A)

Roof Curb for Large Cabinet

Note A: When unit mounting scre w is used,retainer bra cket must also be used.

A

B Typ.

Supply opening(B x C)

LongSupport

D

F

Return opening(B X C)

Insulateddeck pan

ShortSupport

C Typ.

G

E

F

G

DE

A05308

UNIT SIZE ODS CATALOGNUMBER

AIN. (MM)

BIN. (MM)

CIN. (MM)

DIN. (MM)

EIN. (MM)

FIN. (MM)

GIN. (MM)

024--030CPRFCURB006A00 8 (203) 11 (279) 16--1/2 (419) 28--3/4 (730) 30--3/8 (771) 44--5/16 (1126) 45--15/16 (1167)CPRFCURB007A00 14 (356) 11 (279) 16--1/2 (419) 28--3/4 (730) 30--3/8 (771) 44--5/16 (1126) 45--15/16 (1167)

036--060CPRFCURB008A00 8 (203) 16--3/16 (411) 17--3/8 (441) 40--1/4 (1022) 41--15/16 (1065) 44--7/16 (1129) 46--1/16 (1169)CPRFCURB009A00 14 (356) 16--3/16 (411) 17--3/8 (441) 40--1/4 (1022) 41--15/16 (1065) 44--7/16 (1129) 46--1/16 (1169)

NOTES:

1. Roof curb must be set up for unit being installed.2. Seal strip must be applied, as required, to unit being installed.3. Dimensions are in inches.4. Dimensions in ( ) are in millimeters.5. Roof curb is made of 16--gauge steel.6. Attach ductwork to curb (flanges of duct rest on curb).7. Insulated panels: 1--in. thick fiberglass 1 lb. density.8. When unit mounting screw is used (see Note A), a retainer bracket must be used as well. This bracket must also be used when required by code for hurricane or seismic

conditions. This bracket is available through Micrometl.

48DU

11

48DU CORNER WEIGHTS

DETAIL A

A06298

CABINET MODEL RIGGINGWEIGHT A B C D

Small48DU--024 420 90 90 83 15548DU--030 427 92 92 85 158

Large

48DU--036 515 106 119 97 19348DU--042 537 118 84 144 19248DU--048 543 120 90 144 18948DU--060 594 130 95 159 210

A06296

SELECTION PROCEDUREDetermine cooling and heating requirements at designconditions:Given:

REQUIRED COOLING CAPACITY (TC) 34,500 BTUH. . . . .SENSIBLE HEAT CAPACITY (SHC) 42,000 BTUH. . . . . . . .REQUIRED HEATING CAPACITY (SHC) 42,000 BTUH. . . .CONDENSER ENTERING AIR TEMPERATURE 95°F. . . . .INDOOR--AIR TEMPERATURE 80°F EDB, 67°F EWB. . . . .EVAPORATOR AIR QUANTITY 1200 CFM. . . . . . . . . . . . . .ELECTRICAL CHARACTERISTICS 230--1--60. . . . . . . . . . . .

Select unit based on required cooling capacity

Enter Net Cooling Capacities table at condenser enteringtemperature of 95°F. The 036 unit at 1200 cfm and 67°F ewb(entering wet bulb) will provide a total capacity of 34,600 Btuhand a SHC of 24,200 Btuh. Calculate SHC correction, if required,using Note 4 under Cooling Capacities tables.

Select heating capacity of unit to provide design conditionrequirement

In the Heating Capacities and Efficiencies table on page 4, notethat the unit 036060 will provide 48,000 Btuh with an input of60,000 Btuh.

Select unit that corresponds to power source available

The Electrical Data table shows that the unit is designed tooperate at 208/230--1--60.

48DU

12

PERFORMANCEDATA--STANDARDECM

INDOORMOTOR

Cooling

ExtendedPerformanceTable

48DU024HighCool

EVA

PO

RA

TOR

AIR

CO

ND

EN

SE

RE

NT

ER

ING

AIR

TE

MP

ER

AT

UR

ES

deg

F75

8595

105

115

125

CF

ME

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48DU

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INDOORMOTOR

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Seepage18forcoolingnotes.

48DU

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22.

7767

27.3

318

.17

1.50

25.9

217

.64

1.69

24.4

017

.08

1.91

22.7

616

.48

2.15

20.9

915

.84

2.44

19.0

615

.15

2.78

7230

.44

14.6

41.

5328

.89

14.1

21.

7127

.21

13.5

51.

9325

.40

12.9

62.

1723

.45

12.3

32.

4621

.30

11.6

52.

80


48DU

15


INDOORMOTOR

Cooling


48DU042HighCool

EVA

PO

RA

TOR

AIR

CO

ND

EN

SE

RE

NT

ER

ING

AIR

TE

MP

ER

AT

UR

ES

deg

F75

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115

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1225

5740

.34

40.3

42.

7638

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38.5

63.

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.60

36.6

03.

3235

.21

35.2

13.

5832

.79

32.7

93.

9329

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29.0

44.

3762

41.2

437

.05

2.77

39.0

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.02

3.04

36.7

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.39

3.33

35.2

135

.21

3.57

32.7

932

.79

3.93

29.0

429

.04

4.37

6342

.00

29.9

42.

7839

.74

28.9

63.

0537

.29

27.9

03.

3435

.56

27.1

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5832

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25.8

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9228

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24.1

34.

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45.0

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2.84

42.5

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3.10

39.9

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3.39

38.0

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.11

3.63

34.8

126

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3.98

30.1

225

.04

4.40

7249

.21

24.7

72.

9146

.48

23.7

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1743

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22.6

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4644

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22.9

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5241

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21.8

83.

8732

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18.9

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1400

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41.9

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8240

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40.0

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1037

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37.9

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3936

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36.4

63.

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33.8

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29.8

24.

4362

42.1

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2.83

40.0

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3.10

37.9

237

.92

3.39

36.4

636

.46

3.64

33.8

633

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4.00

29.8

229

.82

4.43

6342

.81

31.9

02.

8440

.45

30.8

93.

1037

.88

29.8

13.

3936

.05

29.0

33.

6331

.99

27.3

54.

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.59

25.9

24.

4067

45.8

733

.01

2.89

43.3

031

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3.15

40.5

030

.88

3.44

38.6

530

.16

3.69

35.3

628

.88

4.03

30.3

826

.96

4.45

7250

.09

26.0

42.

9647

.23

25.0

23.

2344

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23.9

23.

5145

.09

24.2

63.

5841

.83

23.1

23.

9332

.98

20.1

34.

51

48DU042Low

Cool

EVA

PO

RA

TOR

AIR

CO

ND

EN

SE

RE

NT

ER

ING

AIR

TE

MP

ER

AT

UR

ES

deg

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855

5728

.20

28.2

01.

8927

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27.0

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25.6

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.16

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22.4

32.

9420

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20.5

03.

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28.9

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.09

1.89

27.4

623

.43

2.11

26.4

622

.99

2.31

24.1

624

.16

2.63

22.4

322

.43

2.94

20.4

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.48

3.29

6329

.61

19.5

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8928

.04

18.9

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1126

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18.2

32.

3524

.41

17.4

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6322

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16.6

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9519

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15.7

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32.0

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.31

1.89

30.3

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2.11

28.4

318

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2.35

26.3

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2.62

23.9

917

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2.92

21.5

216

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3.28

7235

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16.5

11.

8933

.47

15.8

42.

1031

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15.1

22.

3431

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15.2

62.

2826

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13.4

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12.7

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5729

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29.5

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28.2

32.

1226

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26.7

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25.1

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23.2

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21.2

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2962

29.7

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1.90

28.2

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2.12

26.7

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2.36

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425

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2.64

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2.95

21.2

921

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3.29

6330

.34

20.8

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9028

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20.2

32.

1226

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19.5

22.

3724

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18.7

32.

6422

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17.8

82.

9620

.20

16.9

33.

3167

32.8

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1.91

31.0

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2.12

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2.36

28.0

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2.59

24.3

618

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2.93

21.9

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3.29

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17.4

01.

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.17

16.7

22.

1231

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16.0

02.

3531

.03

15.6

82.

5830

.23

15.4

22.

6024

.42

13.5

73.

26


48DU

16


INDOORMOTOR

Cooling


48DU048HighCool

EVA

PO

RA

TOR

AIR

CO

ND

EN

SE

RE

NT

ER

ING

AIR

TE

MP

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AT

UR

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deg

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1400

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36.6

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29.9

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29.0

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24.9

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4.51

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4.92

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4.93

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32.8

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30.9

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29.9

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28.8

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27.5

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4.18

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4.55

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4.97

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27.1

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26.2

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25.2

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2547

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24.2

64.

6244

.30

23.1

55.

0342

.55

22.5

95.

06

48DU048Low

Cool

EVA

PO

RA

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AIR

CO

ND

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SE

RE

NT

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ING

AIR

TE

MP

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AT

UR

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2.78

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21.6

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20.9

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18.5

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2.47

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2.77

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28.6

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3.49

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7240

.19

19.0

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18.3

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17.6

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16.9

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2.80

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3.13

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3.52

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3.97

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23.7

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23.0

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22.3

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21.6

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20.8

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5324

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19.9

23.

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2.23

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2.49

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2.78

31.3

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3.12

29.2

021

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3.51

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3.95

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20.0

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19.3

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18.6

42.

7734

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17.8

83.

1032

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17.0

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4829

.89

16.1

93.

92


48DU

17


INDOORMOTOR

Cooling


48DU060HighCool

EVA

PO

RA

TOR

AIR

CO

ND

EN

SE

RE

NT

ER

ING

AIR

TE

MP

ER

AT

UR

ES

deg

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5

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2000

5758

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4.81

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5.18

55.7

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5.21

48.4

736

.58

6.34

44.0

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7268

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33.6

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4865

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32.4

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9161

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31.1

45.

3757

.37

29.7

25.

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28.1

96.

4448

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26.5

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04

48DU060Low

Cool

EVA

PO

RA

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AIR

CO

ND

EN

SE

RE

NT

ER

ING

AIR

TE

MP

ER

AT

UR

ES

deg

F75

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Tota

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1200

5739

.88

39.8

82.

7038

.34

38.3

43.

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.64

36.6

43.

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.74

34.7

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31.9

04.

3729

.70

29.7

04.

9462

40.9

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2.69

39.0

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.09

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36.9

034

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3.43

34.9

034

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3.87

32.6

032

.60

4.37

30.1

630

.16

4.94

6341

.76

29.1

42.

6939

.78

28.2

73.

0437

.61

27.3

43.

4235

.23

26.3

33.

8732

.61

25.2

24.

3729

.69

24.0

44.

9667

45.0

430

.17

2.68

42.8

729

.29

3.02

40.5

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.35

3.40

37.9

127

.31

3.84

35.0

426

.21

4.33

31.8

425

.00

4.90

7249

.59

24.4

02.

6847

.18

23.5

23.

0144

.52

22.5

63.

3841

.68

21.5

53.

8038

.47

20.4

34.

2834

.93

19.2

14.

84

1370

5741

.69

41.6

92.

7240

.00

40.0

03.

0737

.90

37.9

03.

4535

.45

35.4

53.

8933

.62

33.6

24.

3830

.90

30.9

04.

9562

41.9

838

.83

2.72

40.0

240

.02

3.07

38.1

838

.18

3.45

36.1

336

.13

3.89

33.8

233

.82

4.38

31.1

931

.19

4.95

6342

.72

31.0

92.

7240

.63

30.2

03.

0738

.35

29.2

43.

4535

.86

28.2

13.

8933

.13

27.0

94.

4030

.10

25.8

74.

9867

46.0

332

.23

2.72

43.7

531

.34

3.05

41.2

730

.36

3.43

38.5

529

.32

3.86

35.5

628

.18

4.36

32.2

526

.93

4.92

7250

.62

25.6

82.

7148

.09

24.7

83.

0445

.37

23.8

33.

4142

.32

22.7

73.

8339

.01

21.6

44.

3135

.34

20.4

04.

86


48DU

18

PERFORMANCE DATA (CONT)LEGENDBF — Bypass Factoredb — Entering Dry---BulbEwb — Entering Wet---BulbkW — Total Unit Power Inputldb — Leaving Dry---Bulblwb — Leaving Wet---BulbSHC — Sensible Heat Capacity (1000 Btuh)TC — Total Capacity (1000 Btuh) (net)ECM — Electronic Computated Motor

*At 75°F entering dry bulb (Tennessee Valley Authority [TVA] rating condi-tions); all other at 80°F entering dry bulb.

NOTES:1. Ratings are net; they account for the effects of the evaporator ---fan motorpower and heat.2. Direct interpolation is permissible. Do not extrapolate.

3. The following formulas may be used:

Sensible capacity (Btuh)1.10 x cfm

tldb = tedb ---

Wet---bulb temperature corresponding to enthalpyair leaving evaporator coil (hlwb)

tlwb =

total capacity (Btuh)4.5 x cfm

hlwb = hewb ---

Where: hewb = Enthalpy of air entering evaporator coil

4. The SHC is basedon 80° F edb temperature of air entering evaporator coil.Below 80° F edb, subtract (corr factor x cfm) from SHC.Above 80° F edb, add (corr factor x cfm) to SHC.Correction Factor = 1.10 x (1 + BF) x (edb + 80).

HIGH ALTITUDE COMPENSATION

Nameplate In-put, High Stage

(Btu/hr)

Rated Heating Input (Btu/hr), LP Gas at Installation Altitude Above Sea Level, U.S.A.*0 to 2000 ft 2001 to 3000 ft* 3001 to 4000 ft 4001 to 5000 ft 5001 to 6000 ft

HighStage

LowStage

HighStage

LowStage

HighStage

LowStage

HighStage

LowStage

HighStage

LowStage

40000 38000 26000 31700 23400 31700 22300 31700 21300 31200 2030060000 57000 39000 47500 35100 47500 33500 47500 32000 46800 3040090000 79000 58500 68900 52700 68900 50300 68600 48000 68600 45600115000 103000 75000 100400 67500 98900 64500 83000 61500 83000 58500130000 116000 84500 115500 76100 111800 72700 101300 69300 100400 65900

* For Canadian Installations from 2000 to 4500 ft, use U.S.A. column 2001 to 3000 ft.

Nameplate In-put, High Stage

(Btu/hr)

Rated Heating Input (Btu/hr), Natural Gas at Installation Altitude Above Sea Level, U.S.A.*0 to 2000 ft 2001 to 3000 ft* 3001 to 4000 ft 4001 to 5000 ft 5001 to 6000 ft

HighStage

LowStage

HighStage

LowStage

HighStage

LowStage

HighStage

LowStage

HighStage

LowStage

40000 40000 26000 36000 23400 34400 22300 32800 21300 31200 2030060000 60000 39000 54000 35100 51600 33500 49200 32000 46800 3040090000 90000 58500 81000 52700 77400 50300 73800 48000 70200 45600115000 115000 75000 103500 67500 98900 64500 94300 61500 89700 58500130000 130000 84500 117000 76100 111800 72700 106600 69300 101400 65900

* For Canadian Installations from 2000 to 4500 ft, use U.S.A. column 2001 to 3000 ft.

48DU

19

TYPICAL PIPING AND WIRING

ROOF

RETURN-AIRFLEXIBLE DUCT

CEILINGCONCENTRIC DIFFUSER BOX(FIELD-SUPPLIED)

SUPPLY-AIRFLEXIBLE DUCT

ROOF-MOUNTINGCURB

C00023

USERINTERFACE

DISCONNECTPER NEC*

FROMPOWERSOURCE

RETURNAIR

TOP COVER

FROMGAS LINE

*NEC - NATIONAL ELECTRICAL CODE

A06091

48DU

20

APPLICATION DATACondensate trap—A2--in. condensate trapmustbe field supplied.

1” (25mm) MIN.

2” (50mm) MIN.

TRAPOUTLET

Ductwork— Secure downflow discharge ductwork to roof curb.For horizontal discharge applications, attach ductwork to unit withflanges.

To convert a unit to downflow discharge—Units are equippedwith factory--installed inserts in the downflow openings. Removethe inserts similar to removing an electrical knock--out. Leave onduct covers to seal the horizontal discharge openings in the unit.Units installed in horizontal discharge orientation do not requireduct covers.Minimum cooling ambient operating temperature —All stan-dard units have aminimum ambient operating temperature of 55°F.With accessory low--ambient temperature kit, units can operate attemperatures down to 0°F.Maximum operating outdoor air temperature — Maximumoutdoor operating air temperature for cooling is 125°F.

ELECTRICAL DATA

UNITSIZE V--PH--HZ

VOLTAGERANGE COMPRESSOR

OUTDOORFAN MOTOR

INDOOR FANMOTOR POWER SUPPLY

Min Max RLA LRA FLA FLA MCA MOCP024 208/230–1–60 187 253 10.3 52.0 0.9 4.3 18.0/18.0 25/25030 208/230–1–60 187 253 14.1 70.0 0.9 4.3 22.8/22.8 35/35036 208/230–1–60 187 253 16.7 82.0 0.9 6.8 28.5/28.5 45/45042 208/230–1–60 187 253 16.7 96.0 0.9 6.8 28.5/28.5 45/45048 208/230–1–60 187 253 21.2 96.0 1.5 6.8 34.7/34.7 50/50060 208/230–1–60 187 253 25.6 118.0 1.9 9.1 43.1/43.1 60/60

228 = 1 v229 = 2 v227 = 2 v

LEGEND

FLA — Full Load AmpsLRA — Locked Rotor AmpsMCA -- Minimum Circuit AmpsMOCP — Maximum Overcurrent ProtectionRLA — Rated Load Amps

NO TES:1. In compliance with NEC (National Electrical Code) requirements

for multimotor and combination load equipment (refer to NE CArticles 430 and 440), the overcurrent protective device for theunit shall be Power Supply fuse. The CGA (Canadian GasAssociation) units may be fuse or circuit break er.

2. Minimum wire size is based on 60 C copper wire. I f other than60 C wire is used, or if length exceeds wire length in table,determine siz e from NEC..

3. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply volt-age is greater than 2%. Use the following formula to determinethe percentage of voltage imbalance.

% Voltage imbalance

max voltage deviation from average voltage= 100 xaverage voltage

EXAMPLE: Supply voltage is 230-3-60.AB = 228 vBC = 231 vAC = 227 v

228 + 231 + 227Average Voltage =3

686=3

= 229

Determine maximum deviation from average voltage.(AB) 229 -(BC) 231 -(AC) 229 -

Maximum deviation is 2 v.

Determine percent of voltage imbalance.2% Voltage Imbalance = 100 x

229

= 0.8%

This amount of phase imbalance is satisfactory as it is below themaximum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance ismore than 2%, contact your local electric utility companyimmediately.

®

*Heater capacity (kW) based on heater voltage of 208v & 240v.If power distibution voltage to unit varies from rated heater voltage, heater kW will vary accordingly.

48DU

21

TYPICAL WIRING SCHEMATIC—208/230--1--60

6.0

A06310

48DU

22

CONTROLS

Sequence of Operation

CoolingOperation—With acall for first stagecooling, theoutdoorfan and low--stage compressor are energized. If low--stage cannotsatisfy cooling demand, high--stage is energized by the UserInterface. After second stage is satisfied, the unit returns tolow--stage operation until first stage is satisfied or until second stageis required again.When both first stageand second stage cooling aresatisfied, the compressor will shut off.

NOTE: When two--stage unit is operating at low stage, systemvapor (suction) pressure will be higher than a standardsingle--stage system or high--stage operation.

Gas Heat Mode and Adjustments—When the UI calls for gasheat, the Infinity furnace board performs a self--check, verifies thepressure switch is open, and starts the inducer on high speed.

1. Inducer Pre--purge Period: When the inducer motor comesup on high speed, the pressure switch closes, and the Infinityignition control on the furnace board begins a 15 secondpre--purge period. If the pressure switch fails to remainclosed, the inducer will remain running. After the pressureswitch re--closes, the Infinity ignition control will begin a 15second pre--purge period.

2. Trial--For--Ignition Sequence: The spark igniter will sparkfor 3 seconds. The main gas valve relay contact closes to

energize the gas valve on low stage. After 5 seconds, theigniter is de--energized and a 2--second flame--provingperiod begins. NOTE: The unit always lights on high speedinducer and low stage gas valve operation.

3. Flame--Proving: When the burner flame is proved at theflame--proving sensor, the furnace control determines whatheating stage to run based on feedback from theUI. If theUIis asking for low stage gas heat, the ignition control willchange the inducer speed to low speed and keep the gasvalveenergized on low stage. If theUI is asking for high stage gasheat, the ignition control will maintain running the induceron high speed and energize the gas valve’s high stage relayto increase gas flow.

If the burner flame is not proved within 2 seconds, the control willclose the gas valve and repeat the ignition sequence up to 3 moreTrials--For--Ignition before going to Ignition--Lockout. Lockoutwill reset automatically after 3 hours, by momentarily interrupting230VACpower, orby interrupting 24VACpoweratSEC1 orSEC2to the furnace board.

If flame is proved when there should be no flame present, controlwill lock out of Gas--Heating mode and operate the inducer motoruntil flame is no longer proved.

48DU

23

GUIDE SPECIFICATIONS

SINGLE--PACKAGED GAS HEATING/ELECTRIC COOL-ING UNITS CONSTANT VOLUME APPLICATIONHVAC GUIDE SPECIFICATIONS

SIZE RANGE: 2 TO 5 TONS, NOMINAL (COOLING)40,000 to 130,000 BtuhNominal Heating Input

MODEL NUMBER: 48DU

PART I -- GENERALSYSTEM DESCRIPTION

Outdoor rooftop or ground mounted gas heating/electric cool-ing unit utilizing a two--stage scroll compressor for coolingduty. Unit shall discharge supply air vertically or horizontallyas shown on contract drawings. Outdoor fan/coil section shallhave a draw--thru design with vertical discharge for minimumsound levels.

QUALITY ASSURANCE

A. Unit shall be rated in accordance with ARI Standards210/240, and 270.

B. Unit shall be designed in accordance with UL Standard 1995and ANSI Z21.47--2003.

C. Unit shall be manufactured in a facility registered to ISO9001 manufacturing quality standard.

D. Unit shall be UL listed and c--UL certified as a total packagefor safety requirements.

E. Roof curb shall be designed to conform to NRCA Standards.

F. Insulation and adhesives shall meet NFPA 90A requirementsfor flame spread and smoke generation.

G. Cabinet insulation shall meet ASHRAE Standard 62P.DELIVERY, STORAGE, AND HANDLING

Unit shall be stored and handled permanufacturer’s recommen-dations.

PART 2-- PRODUCTSEQUIPMENT

A. General:Factory--assembled, single--piece, heating and cooling unit.Contained within the unit enclosure shall be all factory wiring,piping, controls, refrigerant charge (R--410A), and special fea-tures required prior to field start--up.

B. Unit Cabinet:

1. Unit cabinet shall be constructed of phosphated,zinc--coated, prepainted steel capable of withstanding 500hrs of salt spray.

2. Normal service shall be through a single removable cabinetpanel.

3. Theunit shall beconstructed on a rust proof unit base thathasan externally trapped, integrated sloped drain pan.

4. Indoor fan compartment top surface shall be insulated witha minimum 1/2--in. thick, flexible fiberglass insulation,coated on the air side and retained by adhesive andmechanical means. The indoor wall sections will beinsulatedwith a foil--faced insulation capableof beingwipedclean. Aluminum foil--faced fiberglass insulation shall beused in the entire indoor air cavity seciton.

5. Unit shall have a field--supplied condensate trap.

C. Fans:

1. The indoor fan shall be direct--drive, variable--speed motorand control, as shown on equipment drawings.

2. Fan wheel shall be made from steel, be double--inlet type.It shall have forward--curved blades with acorrosion--resistant finish and shall be dynamicallybalanced.

3. Outdoor fan shall be of the direct--driven propeller typewithaluminum blades, riveted to corrosion--resistant steelspiders. It shall be dynamically balanced, and discharge airvertically.

D. Compressor:

1. Fully hermetic 2--stage compressors with factory--installedvibration isolation.

2. Two--stage scroll compressors shall be standard on allunits.

E. Coils:

1. Indoor and outdoor coils shall have aluminum plate finsmechanically bonded to seamlesscopper tubeswith all jointsbrazed.

2. Tube sheet openings shall be bellied to prevent tube wear.

F. Heating Section:

1. Induced--draft combustion type with energy saving directspark ignition system and redundant main gas valve.

2. Pressure switch ensures adequate airflow for combustionfrom induced draft motor.

3. The heat exchangers shall be constructed of 409 stainlesssteel for corrosion resistance.

4. Burners shall be of the in--shot type constructed ofaluminum coated steel.

5. All gas piping and electric power shall enter the unitcabinet at a single location.

G. Refrigerant Metering Device:Refrigerant metering device shall be of the TXV(thermostatic expansion valve) type.

H. Filters:Filter section shall consist of field--installed, throw--away,1--in. thick fiberglass filters of commercially available sizes.

I. Controls and Safeties:

1. Unit controls shall be complete with self--contained lowvoltage control circuit.

2. Units shall incorporate an internal compressor protector thatprovides reset capability.

3. Unit shall provide high and low/loss--of--charge pressuresafety protection.

J. Operating Characteristics:

1. Unit shall be capable of starting and running at 125°Fambient outdoor temperature, exceeding maximum loadcriteria of ARI Standard 210.

2. Compressor with standard controls shall be capable ofoperation down to 55°F ambient outdoor temperature. Lowambient cooling down to 0°F is possible with “low ambientcooling” enabled in the UI.

3. Units shall be provided with fan time delay to prevent coldair delivery before the heat exchanger warms up.

K. Electrical Requirements:All unit power wiring shall enter unit cabinet at a single loca-tion.

L. Motors:

1. Compressor motors shall be of the refrigerant--cooled typewith line--break thermal and current overload protection.

2. All fan motors shall have permanently lubricated bearingsand inherent automatic--reset thermal overload protection.

48DU

24

GUIDE SPECIFICATIONS (CONT)

3. Outdoor fan motor shall be totally enclosed.

M. Grille

1. Louvered Grille:Louvered grille shall be factory--installed to provide hailguard and vandalism protection.

N. Special Features:

1. Coil Options:Shall include factory--installed optional tin--plated indoorcopper/copper and vinyl--coated refrigerant coils.

2. Flat Roof Curb:Curbs shall haveseal strip and awood nailer for flashing andshall be installed per manufacturer’s instructions.

3. Manual Outdoor Air Damper:Package shall consist of damper, bird screen, and rain hoodwhich can bepreset to admitoutdoorair for year--round ven-tilation.

4. Infinityt User Interface:To provide for one--stage heating and cooling in addition tomanual or automatic changeover and indoor fan control.

5. Natural--to--Propane Conversion Kit:Shall be complete with all required hardware to convert toliquid propane (LP) operation at minimum 10.0 in. wgmanifold pressure.

6. Filter Rack Kit:Shall provide filter mounting for downflow and horizontalapplications.

7. Square--To--Round Duct Transitions:Shall have the ability to convert the supply and return open-ings from rectangular to round (024--048 sizes only).

8. Crankcase Heater:Shall provide anti--floodback protection for low--load cool-ing applications.

9. High Altitude Kit:Shall consist of natural gas orifices to compensate for gasheat operation at 2001 to 6000 ft above sea level.

10. Low NOx (Natural Gas only) Option (48DUN Models):Shall provide NOx reduction to values below 40 nano-grams/joule to meet California emission requirements.

11. Compressor Hard Start Kit:Shall be available to give a boost to the compressor motorat each start--up.

Copyright 2006 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Catalog No: 48DU---1PD

Replaces: New

Printed in U.S.A. Edition Date: 09/06

48DU

product data · 2013-12-31 · product data a05307 unit 48du ... { rated in accordance with u.s....

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