Carrier PY4G Single Packaged Air Conditioner and Gas Furnace System Instruction Manual

Turn to the experts
Instruction Manual

PY4G Single Packaged Air Conditioner and Gas Furnace System

48VLUK Ultra Low NOx
Comfort™13.4 SEER2 Single-Packaged Air
Conditioner and Gas Furnace System with Puron®
(R-410A) Refrigerant
Single Phase 2-5 Nominal Tons (Sizes 24-60)
Three Phase 3-5 Nominal Tons (Sizes 36-60)

Product Data

A09033
Fig. 1 – Unit 48VL

Single-Packaged Products with Energy-Saving Features and Puron® R-410A refrigerant.

• 13.4 SEER2
• 11.05 EER2
• 81.0% AFUE
• ECM Blower Motor-Standard
• Direct Spark Ignition
• Low Sound Levels
• Dehumidification Feature
• Louvered Condenser Coil Guard-Standard

Features/Benefits

One-piece heating and cooling units with low sound levels, easy installation, low maintenance, and dependable performance.
Puron is Carrier’s unique refrigerant designed to be environmentally balanced. Puron is an HFC refrigerant which does not contain chlorine that can harm the ozone layer. The most important advantage of Puron refrigerant is that it has not been banned in future air conditioning systems as the traditional refrigerant R-22 has been. Puron refrigerant is in service in millions of systems proving highly reliable and is non-ozone depleting.

Easy Installation
Factory-assembled package is a compact, fully self-contained, combination gas heating/electric cooling unit that is prewired, pre-piped, and pre-charged for minimum installation expense. These units are available in a variety of standard and optional heating/ cooling size combinations with voltage options to meet residential and light commercial requirements. Units are lightweight and install easily on a rooftop or at ground level. The high tech composite base eliminates rust problems associated with ground level applications.

Innovative Unit Base Design
On the inside a high-tech composite material will not rust and incorporates a sloped drain pan which improves drainage and helps inhibit mold, algae and bacterial growth. On the outside metal base rails provide added stability as well as easier handling and rigging.

Convertible Duct Configuration
Unit is designed for use in either downflow or horizontal applications. Each unit is converted from horizontal to downflow and includes two horizontal duct covers. Downflow operation is provided in the field to allow vertical ductwork connections. The basepan seals on the bottom openings to ensure a positive seal in the vertical airflow mode.

Efficient operation high-efficiency design offers SEER2 (Seasonal Energy Efficiency Ratios) of 13.4, 11.05 EER2, and AFUE (Annual Fuel Utilization Efficiency) ratings of 81.0%.
Energy-saving, direct spark ignition saves gas by operating only when the room thermostat calls for heating. Standard units are furnished with natural gas controls.
Ultra Low NOx units meet California air quality district standards requiring NOx emissions no more than 14ng/J.

Durable, Dependable Components
Turbo-tubular™ heat exchangers are constructed of stainless steel for corrosion resistance and optimum heat transfer for improved efficiency.
The tubular design permits hot gases to make multiple passes across the path of the supply air.
In addition, dimples located on the heat exchanger walls force the hot gases to stay in close contact with the walls, improving heat transfer.
ECM Blower Motor is standard on all models.

Direct-drive PSC (Permanent Split Capacitor) condenser-fan motors are designed to help reduce energy consumption and provide for cooing operation down to 40°F (4.4°C) outdoor temperature. Motormaster® II low ambient kit is available as a field-installed accessory.

Thermostat Controls
Time Guard® II anti-short cycle protection circuitry. If a non-corporate thermostat without anti-short cycle protection is used the Time Guard II field-installed anti-short cycle kit is recommended.

Refrigerant system is designed to provide dependability. Liquid filter driers are used to promote clean, unrestricted operation. Each unit leaves the factory with a full refrigerant charge. Refrigerant service connections make checking operating pressures easier.
High pressure switch provides added reliability for the compressor.
Indoor and outdoor coils are computer-designed for optimum heat transfer and efficiency. The indoor coil is fabricated from aluminum tube and aluminum fins and is located inside the unit for protection against damage. The outdoor coil is internally mounted on the top tier of the unit.
Low sound ratings ensure a quiet indoor and outdoor environment with sound ratings as low as 70.7 dBA.
Easy to service cabinets provide easy 3-panel accessibility to serviceable components during maintenance and installation. The basepan with integrated drain pan provides easy ground level‘ installation with mounting pad. A nesting feature ensures a positive basepan to roof curb seal when the unit is roof mounted. A convenient 3/4-in. (19.05 mm) wide perimeter flange makes frame mounting on a rooftop easy.
Standard horizontal metal duct covers with insulation come with the unit and cover the horizontal duct openings. These can be left in place if the units are converted to downflow.
Integrated Gas Control (IGC) board provides safe and efficient control of heating and simplifies trouble-shooting through its built-in diagnostic function.
Cabinets are constructed of heavy duty, phosphated, zinc-coated prepainted steel capable of withstanding 500 hours in salt spray. Interior surfaces of the evaporator/heat exchanger compartment are insulated with cleanable semi- rigid insulation board, which keeps the conditioned air from being affected by the outdoor ambient temperature and provides improved indoor air quality. (Conforms to American Society of Heating, Refrigeration and Air Conditioning Engineers 62.2.) The sloped drain pan minimizes standing water in the drain. An external drain is provided.

**Limited Warranty***

• Default 5-year parts limited warranty
  – 10-year parts limited warranty with timely registration. Equipment must be registered within 90 days of original installation, except in jurisdictions where warranty benefits cannot be conditioned on registration.
• Applies to original purchaser/homeowner and 5 years to subsequent owners.
  • Default 5-year on compressor limited warranty
    -10-year on compressor limited warranty with timely registration.
    Equipment must be registered within 90 days of original installation, except in jurisdictions where warranty benefits cannot be conditioned on registration.
• Applies to original purchaser/homeowner and 5 years to subsequent owners.
  • Default 20-year stainless steel heat exchanger limited warranty
    – Life stainless steel limited warranty with timely registration.
    Equipment must be registered within 90 days of original installation, except in jurisdictions where warranty benefits cannot be conditioned on registration.
• Applies to original purchaser/homeowner and 5 years to subsequent owners. See warranty certificate for complete details and restrictions.

48VLUK Ultra Low NOx: Product Data
Model Number Nomenclature

Use of the AHRI Certified TM Mark indicates a manufacturer’s participation in the program For verification of certification for individual products, go to www.ahridirectory.org.

SAP ORDERING NO.| NOMINAL COOLING CAPACITY
(Btuh)| NOMINAL HEATING INPUT (Btuh)| VOLTS-PHASE (60 HZ)| APPROX SHIP WT (LB)
---|---|---|---|---
48VLUK240403| 24,000| 45,000| 208/230-1| 329
48VLUK240603| 24,000| 60,000| 208/230-1| 329
48VLUK300403| 30,000| 45,000| 208/230-1| 361
48VLUK300603| 30,000| 60,000| 208/230-1| 361
48VLUK360603| 36,000| 60,000| 208/230-1| 361
48VLUK360605| 36,000| 60,000| 208/230-3| 361
48VLUK420603| 42,000| 60,000| 208/230-1| 455
48VLUK420605| 42,000| 60,000| 208/230-3| 455
48VLUK420903| 42,000| 89,000| 208/230-1| 455
48VLUK420905| 42,000| 89,000| 208/230-3| 455
48VLUK480903| 48,000| 89,000| 208/230-1| 480
48VLUK480905| 48,000| 89,000| 208/230-3| 480
48VLUK600903| 60,000| 89,000| 208/230-1| 497
48VLUK600905| 60,000| 89,000| 208/230-3| 497

AHRI * Capacities

Cooling Capacities and Efficiencies

UNIT SIZE| NOMINAL TONS| STANDARD CFM| COOLING CAPACITY †| EER2 ‡| SEER2 **
---|---|---|---|---|---
24| 2| 750| 22800| 11.05| 13.4
30| 2.5| 950| 28000| 11.05| 13.4
36| 3| 1150| 33800| 11.05| 13.4
42| 3.5| 1350| 39000| 11.05| 13.4
48| 4| 1600| 47000| 11.05| 13.4
60| 5| 1750| 56000| 11.05| 13.4

*. Air Conditioning, Heating & Refrigeration Institute.
†. Rated in accordance with U.S. Government DOE Department of Energy) test procedures and/or AHRI Standards 210/240.
‡. At “A” conditions-80°F (26.7°C) indoor db/67°F (19.4°C) indoor wb & 95°F (35°C) outdoor db.
**. Rated in accordance with AHRI Standard 270.

Notes:

1. Ratings are net values, reflecting the effects of circulating fan heat.
   Ratings are based on:
   Cooling Standard: 80°F (26.7°C) db, 67°F wb (19.4°C) indoor entering-air temperature and 95°F db (35°C) outdoor entering-air temperature.

2. Before purchasing this appliance, read important energy cost and efficiency information available from your retailer.
   LEGEND
   dB-Sound Levels (decibels)
   db—Dry Bulb
   SEER—Seasonal Energy Efficiency Ratio
   wb—Wet Bulb
   COP-Coefficient of Performance

Gas Heating Capacities and Efficiencies, Single and Three Phase Models

Unit Size| Heating Input (Btuh)| Output Capacity (Btuh)| Temperature Rise Range °F (°C)| AFUE (%)
---|---|---|---|---
24040
30040| 45,000| 37,000| 25-55
(14-31)| 81.0
24060
30060
36060
42060| 60,000| 49,000| 25-55
(14-31)| 81.0
42090
48090
60090| 89,000| 73,000| 35-65
(19-36)| 81.0

LEGEND
AFUE—Annual Fuel Utilization Efficiency
NOTE: Before purchasing this appliance, read important energy cost and efficiency information available from your retailer.

A-Weighted Sound Power Level

UNIT SIZE| STANDARD
RATING (dBA)| TYPICAL OCTAVE BAND SPECTRUM (dBA without tone adjustment)
---|---|---
125| 250| 500| 1000| 2000| 4000| 8000
24| 70.7| 59.4| 58.5| 58.3| 60.4| 56.7| 52.6| 46.9
30| 73.4| 53.8| 59.9| 62.3| 64.0| 61.4| 53.8| 45.6
36| 74.8| 67.1| 60.3| 64.3| 63.8| 61.9| 57.1| 50.8
42| 74.9| 62.5| 63.1| 63.7| 65.5| 61.5| 57.5| 53.5
48| 75.4| 64.1| 61.0| 65.5| 63.7| 61.8| 60.1| 56.1
60| 76.6| 65.4| 63.7| 67.9| 66.7| 62.7| 58.9| 55.6

NOTE: Tested in compliance with AHRI 270 but not listed with AHRI.

ECONOMIZER

Physical Data

UNIT SIZE| 24040| 24060| 30040| 30060| 36060| 42060| 42090| 48090| 60090
---|---|---|---|---|---|---|---|---|---
NOMINAL CAPACITY (ton)| 2| 2| 2-1/2| 2-1/2| 3| 3-1/2| 3-1/2| 4| 5
SHIPPING WEIGHT lb.
SHIPPING WEIGHT (kg)| 339
154| 339
154| 348
158| 348
158| 394
179| 428
194| 428
194| 481
218| 495
225
COMPRESSOR / QUANTITY| Scroll / 1
REFRIGERANT (R-410A)
Quantity lb. Quantity (kg)| 6.4
2.9| 6.4
2.9| 6.0
2.7| 6.0
2.7| 5.75
2.6| 6.0
2.7| 6.0
2.7| 9.0
4.1| 10.75
4.9
REFRIGERANT METERING DEVICE| Orifice| TXV
ORIFICE ID in. / mm| .059 / 1.5| .059 / 1.5| .063 / 1.60| .063 / 1.60| .070 / 1.78| .073 / 1.85| .073 /1.85| .080 / 2.03| N/A
OUTDOOR COIL
Rows…Fins/in. Face Area (sq ft)| 1..21
11.9| 1…21
11.9| 1…21
13.6| 1…21
13.6| 1…21
13.6| 1…21
13.6| 1…21
13.6| 1…21
23.3| 2..21
17.5
OUTDOOR FAN
Nominal CFM Diameter in. Diameter (mm) Motor Hp (Rpm)| 2500
24
609.6
1/12 (810)| 2500
24
609.6
1/12 (810)| 3200
24
609.6
1/5 (810)| 3200
24
609.6
1/5 (810)| 3500
26
660.4
1/2 (810)| 3500
26
660.4
3/4 (810| 3500
26
660.4
3/4 (810)| 3500
26
660.4
1/5 (810)| 3500
26
660.4
1/5 (810)
INDOOR COIL
Rows…Fins/in. Face Area (sq ft)| 3…17
3.7| 3…17
3.7| 3…17
3.7| 3…17
3.7| 2…17
5.6| 3…17
4.7| 3…17
4.7| 3…17
5.6| 3…17
5.6
INDOOR BLOWER
Nominal Cooling Airflow (CFM) Size in.
Size (mm.) Motor HP (RPM)| 750
10×10
254×254
1/2 (1050)| 750
10×10
254×254
1/2 (1050)| 950
10×10
254×254
1/2 (1050)| 950
10×10
254×254
1/2 (1050)| 1150
11×10
279.4×254
3/4 (1000)| 1350
11×10
279.4×254
1/2 (1050)| 1350
11×10
279.4×254
1/2 (1050)| 1600
11×10
279.4×254
1.0 (1075)| 1750
11×10
279.4×254
1.0 (1075)
FURNACE SECTION*
Burner Orifice No. (Qty…Drill Size)
1 & 3 Phase Ultra Low NOx Natural Gas (Factory Installed)| 1…0.125”
size| 1…#28| 1…0.125”
size| 1…#28| 1…#28| 1…#28| 1…#18| 1…#18| 1…#18
HIGH-PRESSURE SWITCH
(psig) Cut-out Reset (Auto)| 650 +/- 15
420 +/- 25
LOSS-OF-CHARGE / LOW-PRESSURE
SWITCH (Liquid Line) (psig) cut-out Reset (auto)| NA
RETURN-AIR FILTERS† ‡
Throwaway Size in. (mm)| 2 each 20x12x1 508x305x25| 1 each 24x16x1
610x406x25
24x18x1
610x457x25| 1 each 24x14x1 610x356x25
24x16x1
610x406x25| 1 each 24x16x1 610x406x25
24x18x1
610x457x25

*. Based on altitude of 0 to 2000 ft (0-610 m).
†. Required filter sizes shown are based on the larger of the AHRI (Air Conditioning Heating and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of 300 to 350 ft/minute for throwaway type. Air filter pressure drop for non-standard filters must not exceed 0.08 IN. W.C.
‡. If using accessory filter rack refer to the filter rack installation instructions for correct filter sizes and quantity NA – Not Available

Accessories

All
Economizer – Vertical, gear driven w/Filter Rack and 1-in. filter| CPECOMZR007B00| 24-30
CPECOMZR008A00| 42
CPECOMZR009A00| 36, 48, 60
Economizer – Horizontal w/Filter Rack and 1-in. filter| CPECOMZR010B00| 24-30
CPECOMZR011B00| 42
CPECOMZR012B00| 36, 48, 60
Outdoor Enthalpy Control| AXB078ENT*| All
Manual Outside Air Damper (Includes filter rack and 1-in. filter, same as CPFILTRK kit)| CPMANDPR007A00| 24-30
CPMANDPR008A00| 42
CPMANDPR009A00| 36, 48, 60
Internal Filter Rack (includes 1−in. filters)| CPFILTRK007A00| 24-30
CPFILTRK008A00| 42
CPFILTRK009A00| 36, 48, 60
240V Crankcase Heater| CPCRKHTR008A00| 24-36, 208/230-1
CPCRKHTR004A00| 30 208/230-1, 42-60 208/230-1
Low Ambient Control| CPLOWAMB001A00| All
Five Minute Compressor Delay| NRTIMEGD001A00| All
PTC Compressor Start Assist Kit| CPHSTART002A00| All Single Phase
Flue Discharge Deflector Assembly| CPFLUEDS001A00| All
Square to Round (1 set of 2, use with horizontal duct flanges only)| CPDUC FLG002A00| 24-48
Low Pressure Switch| CPLPSCTL001A00| 24-60

*. Outdoor enthalpy available as field installed accessory; Filter rack and 1-in. filter, same as CPFILTRK kit

Unit Dimensions

24-30

Unit Dimensions
36-60

Accessory Dimensions

Unit Size| Catalog Number| A IN.
(mm)| B (small / common base)
IN. (mm)| B (large base) IN. (mm)| C IN. (mm)| D IN. (mm)| E IN. (mm)| F IN. (mm)| G
IN. (mm)| H
IN. (mm)
---|---|---|---|---|---|---|---|---|---|---
Small or Large| CPRFCURB011B00| 14 (356)| 10 (254)| 14 (356)| 16 (406)| 47.8
(1214)| 32.4
(822)| 2.7 (69)| 30.6 (778)| 46.1 (1170)
Large| CPRFCURB013B00| 14 (356)| 14 (356)| 43.9
(1116)| 42.2 (1072)

• Part Number CPRCURB011B00 can be used on both small and large basepan units. The cross supports must be located based on whether the unit is a small basepan or a large basepan.
  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. Roof curb is made of 16-gauge steel.
  4. Attach ductwork to curb (flanges of duct rest on curb).
  5. Insulated panels: 1-in. (25.4 mm) thick fiberglass 1 lb. density.

Selection Procedure (With Example)

DETERMINE COOLING AND HEATING REQUIREMENTS AT DESIGN CONDITIONS:

Given:
Required Cooling Capacity (TC) …………………………………46,000 Btuh
Sensible Heat Capacity (SHC)…………………………………….34,000 Btuh
Required Heating Capacity…………………………………………72,000 Btuh
Condenser Entering Air Temperature ………………………….95°F (35°C)
Indoor-Air Temperature ………………80°F (27°C) edb 67°F (19°C) ewb
Evaporator Air Quantity………………………………………………. 1600 CFM
External Static Pressure ………………………………………… 0.440 IN. W.C.
Electrical Characteristics ……………………………………………….. 208-1-60

SELECT UNIT BASED ON REQUIRED COOLING CAPACITY
Enter Net Cooling Capacities table at condenser entering temperature of 95°F (35°C). Unit 48 at 1600 CFM and 67°F (19°C) ewb (entering wet bulb) will provide a total capacity of 47,000 Btuh and a SHC of 35,000 Btuh. Calculate SHC correction, if required, using Note 4 under Cooling Capacities tables.

SELECT ELECTRIC HEAT
In the Gas Heating Capacities and Efficiencies table, note that the 48090 unit will provide 73,000 Btuh with an input of 89,000 Btuh.

DETERMINE FAN SPEED AND POWER REQUIREMENTS AT DESIGN CONDITIONS.
Before entering the air delivery tables, calculate the total static pressure required. From the given example, the Wet Coil Pressure Drop Table, and the Filter Pressure Drop Table:

At 0.43 IN. W.C. ESP (external static pressure) and MED speed the motor delivers between 1664 CFM and 1627 cfm. Interpolation estimates 1653 CFM at .43 IN. W.C. Thus, MED delivers CFM needed.

SELECT UNIT THAT CORRESPONDS TO POWER SOURCE AVAILABLE.
The Electrical Data Table shows that the unit is designed to operate at 208-1-60.

Performance Data

24 Size

30 Size

36 Size

42 Size

48 Size

60 Size

Performance Data

• At 75ºF (24ºC) entering dry bulb-Tennessee Valley Authority (TVA) rating conditions; all others at 80ºF dry bulb.

• Sensible capacities shown are based on 80ºF (27ºC) entering air at the indoor coil. For sensible capacities at other than 80ºF (27ºC), deduct 835 Btuh (245 kW) per 1000 CFM (480 L/S) of indoor coil air for each degree below 80ºF (27ºC), or add 835 Btuh (245 kW) per 1000 CFM (480 L/S) of indoor coil air per degree above 80ºF (27ºC).
  System KW is total of indoor and outdoor unit kilowatts.
  LEGEND
  BF— Bypass Factor
  edb— Entering Dry—Bulb
  Ewb— Entering Wet—Bulb
  kW — Total Unit Power Input
  SHC— Sensible Heat Capacity (1000 Btuh)
  TC — Total Capacity (1000 Btuh) (net)
  rh—Relative Humidity
  COOLING NOTES:**

1. Ratings are net; they account for the effects of the evaporator —fan motor power and heat.

2. Direct interpolation is permissible. Do not extrapolate.

3. The following formulas may be used:

4. The SHC is based on 80_F (26.6_C) edb temperature of air enteringevaporator coil. Below 80_F (26.6_C) edb, subtract (corr factor x cfm) from SHC. Above 80_F (26.6_C) edb, add (corr factor x cfm) to SHC.
   Correction Factor = 1.10 x (1 + BF) x (edb — 80).

5. Integrated capacity is maximum (instantaneous) capacity less the effect of frost on the outdoor coil and the heat required to defrost it.

Gas Adjustment
Natural Gas Orifice Sizes and Manifold Pressure – Single and Three Phase Models

Nameplate Input (Btu/hr)| | Altitude of Installation (FT. Above Sea Level)
**U.S.A. *
---|---|---
0 to 2000 (0-610 m)**
45,000| Orifice No. (Qty)| 0.125-in.
Manifold Press. (in. W.C.)| 3.2~3.8
60,000| Orifice No. (Qty)| 28 (1)
Manifold Press. (in. W.C.)| 3.2~3.8
89,000| Orifice No. (Qty)| 18 (1)
Manifold Press. (in. W.C.)| 3.2~3.8

*Dry Coil Air Delivery – Horizontal and Downflow Discharge Sizes 24-60**

*Dry Coil Air Delivery – Horizontal and Downflow Discharge Sizes 24-60**

*Dry Coil Air Delivery – Horizontal and Downflow Discharge Sizes 24-60**

*Dry Coil Air Delivery – Horizontal and Downflow Discharge Sizes 24-60**

• Air delivery values are without air filter and are for dry coil (See Wet Coil Pressure Drop Table).
  † Factory-shipped continuous fan speed
  ‡ Factory-shipped heating speed
  Factory-shipped cooling speed
  “High Static Cooling” = Only to be used for cooling function (not allowed for heating function)
  NOTE:** Deduct field-supplied air filter pressure drop and wet coil pressure drop to obtain static pressure available for ducting.
  Shaded areas indicate speed/static combinations that are not permitted for dehumidification speed.

Wet Coil Pressure Drop (IN. W.C.)

Economizer with 1-in. Filter Pressure Drop (IN. W.C.)

Filter Pressure Drop Table (IN. W.C.)

Typical Piping and Wiring

Application Data

Condensate trap — A 2-in. (50.8 mm) condensate trap must be field supplied.
Ductwork — Secure downflow discharge ductwork to roof curb. For horizontal discharge applications, attach ductwork to unit with flanges.
To convert a unit to downflow discharge — Units are equipped with factory-installed inserts in the down-flow openings. Removal of the inserts is similar to removing an electrical knock-out. Use the duct cover to seal the horizontal discharge openings in the unit. Units installed in horizontal discharge orientation do not require duct covers.
Airflow — Units are draw-thru in the cooling mode and blow-thru in the heating mode.
Maximum cooling airflow — To minimize the possibility of condensate blow- off from the evaporator, airflow through the units should not exceed 450 CFM per ton.
Minimum cooling airflow — Minimum cooling airflow is 350 cfm per ton.
Minimum ambient cooling operation temperature — All standard units have a minimum ambient operating temperature of 40_F (4_C).
With accessory low ambient temperature kit, units can operate at temperatures down to 0_F (-17_C).
Minimum temperature — Air entering the heat exchanger in heating mode must be a minimum of 50_F (10_C) continuous and/or 45_F (7_C) intermittent.

Electrical Data

MODEL| NOMINAL
V-PH-HZ| VOLTAGE RANGE| COMPRESSOR| OFM| IFM| IDM| POWER SUPPLY
---|---|---|---|---|---|---|---
MIN| MAX| RLA| LRA| FLA| FLA| FLA| MCA| MOCP
24040, 24060| 208/230-1-60| 197| 253| 11.1| 59.5| 0.6| 3.9| 0.7| 18.4| 25
30040, 30060| 208/230-1-60| 197| 253| 14.1| 67.9| 1.05| 3.9| 0.7| 22.6| 30
36060| 208/230-1-60| 197| 253| 14.7| 75| 1.05| 3.8| 0.7| 23.3| 35
36060| 208/230-3-60| 197| 253| 8.5| 70| 1.05| 3.8| 0.7| 15.5| 25
42060, 42090| 208/230-1-60| 197| 253| 16.7| 109| 1.05| 5.8| 0.7| 27.8| 40
42060, 42090| 208/230-3-60| 197| 253| 11.2| 84| 1.05| 5.8| 0.7| 20.9| 30
48090| 208/230-1-60| 197| 253| 19.6| 130| 1.05| 6.9| 0.7| 32.5| 50
48090| 208/230-3-60| 197| 253| 13.7| 83.1| 1.05| 6.9| 0.7| 25.1| 35
60090| 208/230-1-60| 197| 253| 23.9| 124.5| 1.05| 6.9| 0.7| 37.9| 60
60090| 208/230-3-60| 197| 253| 13.5| 93| 1.05| 6.9| 0.7| 24.9| 35

LEGEND
FLA – Full Load Amps
IDM – Inducer Motor
IFM – Indoor Fan Motor
LRA -Locked Rotor Amps
MCA – Minimum Circuit Amps
MOCP – Maximum Over Current Protection
OFM – Outdoor Fan Motor
RLA – Rated Load Amps

NOTES:

1. In compliance with NEC (National Electrical Code) requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be Power Supply fuse or circuit breaker.
2. Minimum wire size is based on 60 C copper wire. Ifother than 60 C wire is used, or if length exceeds wire length in table, determine size from NEC.
3. Unbalanced 3-Phase Supply Voltage
   Never operate a motor where a phase imbalance in supply volt- age is greater than 2%. Use the following formula to determine the percentage of voltage imbalance

% Voltage imbalance

EXAMPLE: Supply voltage is 230-3-60.

Determine maximum deviation from average voltage.
(AB) 229 – 228 =1v
(BC) 231 – 229 =2v
(AC) 229 – 227 =2v
Maximum deviation is 2 v.
Determine percent of voltage imbalance

% Voltage Imbalance =
= 0.8%
This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%,
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

Connection Wiring Schematic 208/230-1-60

CONNECTION WIRING DIAGRAM
DANGER: ELECTRICAL SHOCK HAZARD DISCONNECT POWER BEFORE SERVICING
SCHEMATIC 208/230-1-60

Ladder Wiring Schematic 208/230-1-60

Connection Wiring Schematic 208/230-3-60

CONNECTION WIRING DIAGRAM
DANGER: ELECTRICAL SHOCK HAZARD DISCONNECT POWER BEFORE SERVICING
SCHEMATIC 208/230-1-60

Ladder Wiring Schematic 208/230-3-60

Controls

Operating Sequence
Heating Sequence of Operation (Ultra Low NOx Single and Three Phase Models)
On a call for heating, terminal W of the thermostat is energized, starting the induced-draft motor for a 30 second pre-purge at intermediate speed. When the pressure switch senses that the induced-draft motor is moving sufficient combustion air, the burner sequence begins. This function is controlled by the integrated gas unit controller (IGC).
After 30 sec of pre-purge is complete, the pressure switch checks for sufficient combustion. Then, the gas valve energizes and the system attempts to ignite with igniter being energized. The igniter energizes for 5 sec and integrated gas controller (IGC) allows system to sense flame for 2 sec at the end of 5 sec of ignition trial. On first successful ignition, system stays at the intermediate inducer speed for 10 sec and gradually ramps up to the high speed for steady-state operation. The system uses the same logic for 2nd ignition trial. If a 3rd or 4th ignition attempt is needed, the inducer speed is decreased to the low speed. On a successful light on the 3rd or 4th attempt, the inducer speed is increased to the intermediate speed for about 10 seconds and then gradually ramps up to the high speed for steady-state operation. In case the 4th attempt fails, the system will lock out for 1 hr. After 1 hr. lock out period, the system starts with normal operating sequence. Once flame is established and proven successfully, indoor (evaporator) fan motor is energized after 30 seconds. When the thermostat is satisfied and W is de-energized, the pre-mix burner will stop firing and the indoor (evaporator) fan motor shuts off after a 90 second time-off delay. Please note that the IGC has the capability to automatically decrease the indoor (evaporator) fan motor “ON” delay and increase the indoor (evaporator) fan motor “OFF” delay in the event of high duct static and/or partially-clogged filter.

Cooling Sequence of Operation
With the room thermostat SYSTEM switch in the COOL position and the FAN switch in the AUTO position, the cooling sequence of operation is as follows:

1. When the room temperature rises to a point that is slightly above the cooling control setting of the thermostat, the thermostat completes the circuit between thermostat terminal R to terminals Y and G.
2. The normally open contacts of energized contactor (C) close and complete the circuit through compressor motor (COMP) to condenser (outdoor) fan motor (OFM). Both motors start instantly.
3. The set of normally open contacts on the interface fan board (IFB) are closed which energizes a circuit to the indoor fan motor (IFM).

NOTE: Once the compressor has started and then stopped, it should not be started again until 5 minutes have elapsed. The cooling cycle remains on until the room temperature drops to a point that is slightly below the cooling control setting of the room thermostat. At this point, the thermostat breaks the circuit between thermostat terminal R to terminals Y and G. These open circuits deenergize contactor coil C. The condenser and compressor motors stop. After a 60-sec. delay, the blower motor stops. The unit is in a standby condition, waiting for the next call for cooling from the room thermostat.

Guide Specifications

Packaged Gas Heating/Electric Cooling Units
Constant Volume Application
HVAC Guide Specifications
Size Range:2 to 5 Tons, Nominal Cooling
60,000 to 90,000 Btuh,
Nominal Heating Input

General

SYSTEM DESCRIPTION
Outdoor rooftop mounted, gas heating/electric cooling unit utilizing a hermetic scroll compressor for cooling duty. Unit shall discharge supply air vertically or horizontally as shown on contract drawings. Condenser fan/coil section shall have a draw-thru design with vertical discharge for minimum sound levels.

QUALITY ASSURANCE

• Unit shall be rated in accordance with AHRI Standards 210/240 and 270-1995.
• Unit shall be designed in accordance with UL Standard 1995 and ANSI Z 21.47.
• Unit shall be manufactured in a facility registered to ISO 9001 manufacturing quality standard.
• Unit shall be UL listed and c-UL certified as a total package for safety requirements.
• Roof curb shall be designed to conform to NRCA Standards.
• Insulation and adhesives shall meet NFPA 90.1 requirements for flame spread and smoke generation.
• Cabinet insulation shall meet ASHRAE Standard 62.2.

DELIVERY, STORAGE AND HANDLING

• Unit shall be stored and handled per manufacturer’s recommendations.

Products

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

• Unit cabinet shall be constructed of phosphated, zinc-coated, pre-painted steel capable of with-standing 500 hours in salt spray.

• Normal service shall be through 3 removable cabinet panels.

• The unit shall be constructed on a rust proof unit base that has an externally trapped, integrated sloped drain.

• Evaporator fan compartment top surface shall be insulated with a minimum 1/2-in. (12.7 mm) thick, flexible fiberglass insulation, coated on the air side and retained by adhesive and mechanical means. The evaporator wall sections will be insulated with a minimum semi-rigid foil-faced board capable of being wiped clean.
  Aluminum foil-faced fiberglass insulation shall be used in the entire indoor air cavity section.

• Unit shall have a field-supplied condensate trap.

Fans:

• The evaporator fan shall be a multi-speed, direct-drive, as shown on equipment drawings.
• Fan wheel shall be made from steel, be double-inlet type with forward curved blades with corrosion resistant finish. Fan wheel shall be dynamically balanced.
• Condenser fan shall be direct drive propeller type with aluminum blades riveted to corrosion resistant steel spiders, be dynamically balanced, and discharge air vertically.

Compressor:

• Fully hermetic compressors with factory-installed vibration isolation.

Coils:
Evaporator and condenser coils shall have aluminum plate fins mechanically bonded to seamless copper tubes with all joints brazed.
Tube sheet openings shall be belled to prevent tube wear.

Heating Section:

• Induced-draft combustion type with energy saving direct spark ignition system and redundant main gas valve.
• Induced-draft motors shall provide adequate airflow for combustion.
• The heat exchangers shall be constructed of stainless steel for corrosion resistance.
• Pre-mixed burners shall be stainless steel and other alloys.
• All gas piping and electric power shall enter the unit cabinet at a single location.

Refrigerant Components:
Refrigerant expansion device shall be of the TXV (thermostatic
expansion valve) or fixed orifice type.
Filters:
Filter section shall consist of field-installed, throwaway, 1-in. (25 mm) thick fiberglass filters of commercially available sizes.

Controls and Safeties:

• Unit controls shall be complete with a self-contained low voltage control circuit.
• Compressors shall incorporate a solid-state compressor protector that provides reset capability.

Operating Characteristics:

• Unit shall be capable of starting and running at 125_F (51_C) ambient outdoor temperature per maximum load criteria of AHRI Standard 210.
• Compressor with standard controls shall be capable of operation down to 40_F (4_C) ambient outdoor temperature.
• Units shall be provided with fan time delay to prevent cold air delivery before the heat exchanger warms up.
• Unit shall be provided with 60-second fan time delay (single phase models) after the thermostat is satisfied.

Electrical Requirements:
All unit power wiring shall enter the unit cabinet at a single location.

Motors:

• Compressor motors shall be of the refrigerant-cooled type with line-break thermal and current overload protection.
• All fan motors shall have permanently lubricated bearings, and inherent, automatic reset, thermal overload protection.
• Condenser fan motor shall be totally enclosed.
• Evaporator Fan Motor to be ECM Motor.

Compressor Protection:
Solid-state control shall protect compressor by preventing “short cycling.”

Ultra Low NOx:
Shall provide NOx reduction to meet 14ng/J NOx emissions requirements as shipped from the factory.

Special Features Available:

1. Coil Options
   Base unit with tin plated indoor coil hairpins available as a factory installed option.

2. Compressor Start Kit (single phase units only):
   Shall provide additional starting torque for single-phase compressors.

3. Thermostat:
   To provide for one-stage heating and cooling in addition manual or automatic changeover and indoor fan control.

4. Crankcase Heater:
   Shall provide anti-floodback protection for low-load cooling applications.

5. Economizer:
   (Horizontal – Field installed accessory)
   (Vertical – Field installed accessory)
   a. Economizer controls capable of providing free cooling using outside air.
   b. Equipped with low leakage dampers not to exceed 3% leakage, at 1.0 IN. W.C. pressure differential.
   c. Spring return motor shuts off outdoor damper on power failure.

6. Filter Rack Kit:
   Shall provide filter mounting for downflow applications. Offered as a field installed accessory.

7. Flat Roof Curb:
   Curbs shall have seal strip and a wood nailer for flashing and shall be installed per manufacturer’s instructions.

8. Flue Discharge Deflector
   Directs flue gas exhaust; 90 degrees upward from current discharge.

9. Low Ambient Package:
   Shall consist of a solid-state control and condenser coil temperature sensor for controlling condenser-fan motor operation, which shall allow unit to operate down to 0_F (-18_C) outdoor ambient temperature when properly installed.

10. Manual Outdoor Air Damper:
    Package shall consist of damper, birdscreen, and rainhood which can be preset to admit outdoor air for year-round ventilation.

11. Square-To-Round Duct Transitions (24-48 models):
    Shall have the ability to convert the supply and return openings from rectangular to round.

12. Time Guard II
    Automatically prevents the compressor from restarting for at least 4 minutes and 45 seconds after shutdown of the compressor. Not required when a corporate programmable thermostat is applied or with a RTU-MP control. Offered as a field installed accessory.

13. Louver Metal Outdoor Coil Grille
    Shall provide hail and vandalism protection. Available as a field installed accessory.

14. Low Pressure Switch Kit
    Kit is designed for use when a low pressure control in desired. This kit provides added reliability for the compressor.

© 2023 Carrier. All rights reserved.
Edition Date: 06/23
Catalog No: 48VL-ULN-11PD
Replaces: 48VL-ULN-10PD
Manufacturer reserves the right to change, at any time,
specifications and designs without notice and without obligations.

Documents / Resources

| Carrier PY4G Single Packaged Air Conditioner and Gas Furnace System [pdf] Instruction Manual
PY4G Single Packaged Air Conditioner and Gas Furnace System, PY4G, Single Packaged Air Conditioner and Gas Furnace System, Packaged Air Conditioner and Gas Furnace System, Conditioner and Gas Furnace System, Gas Furnace System, Furnace System
---|---

References

• ahridirectory.org

Read User Manual Online (PDF format)

Download This Manual (PDF format)

Download this manual  >>