Carrier 48VT-K Single Package HYBRID HEAT Dual Fuel System User Manual

48VT-K Single Package HYBRID HEAT Dual Fuel System
User Manual

48VT-K Single Package HYBRID HEAT Dual Fuel System

48VT-K
13.4 SEER2 Single-Package HYBRID HEAT Dual Fuel
System with Puron (R-410A) Refrigerant Single
Phase 2-5 Nominal Tons (Sizes 24-60)

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

• 13.4 SEER2
• 11.05 EER2
• 6.7 HSPF2
• 81.0% AFUE
• ECM Motor-Standard
• Direct Spark Ignition
• Dehumidification Feature
• Louvers – 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 a HFC refrigerant which does not contain chlorine that can harm the ozone layer. 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 heating and 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.

Product Data

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 horizontal duct covers. Downflow operation is provided in the field to allow vertical ductwork connections. The base pan seals on the bottom openings to ensure a positive seal in the vertical airflow mode.
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. A low-cost field installed kit for propane conversion is available for all units.
Low NOx units are designed for California installations and meet 40 ng/J NOx emissions. Can be installed in air quality management districts with a 40 ng/J NOx emissions requirement.
Durable, dependable components
Scroll Compressors are designed for high efficiency. Each compressor is hermetically sealed against contamination to help promote longer life and dependable operation. Each compressor also has vibration isolation to provide quieter  operation. All compressors have internal high pressure and overcurrent protection.
Manuport Inshot burners produce precise air-to-gas mixture, which provides for clean and efficient combustion. The large manuport on the Inshot (or injection type) burners seldom, if ever, requires cleaning. All gas furnace  components are accessible in one compartment.
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 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 cooling operation down to 40°F (4.4°C) outdoor temperature. Low ambient kit is available as a field  installed accessory.
Thermostat Controls
In order to take full advantage of the features afforded by your HYBRID HEAT® (dual-fuel) product, you need to install the Thermidistat™ Control in either its programmable (part # TP-PRH) or non-programmable (TP-NRH) models.
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 and Low Pressure Switches provide 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 indoor coils 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 69.9 dBA.
Easy to service cabinets provide easy multiple panel accessibility to serviceable components during maintenance and installation. The base with integrated drain pan provides easy ground level installation with a mounting pad. A nesting  feature ensures a positive base pan to roof curb seal when the unit is roof mounted. A convenient 3/4-in. (19 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, phosphate, zinc-coated preprinted 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 No. 62P.) The sloped drain pan minimizes standing water in the drain. An external drain is provided.
Short-Cycling protection for the compressor is incorporated into our defrost control board ensuring a five minute delay (+/-2 minutes) before restarting compressor after shutdown for any reason.
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 20 years to subsequent owners.
  See Warranty certificate for complete details

For California Residents:
This furnace does not comply with SCAQMD Rule 1111 or SJVAPCD Rule 4905, which places a NOx emission limit of 14 ng/J. Therefore, this unit is not eligible to be installed in the South Coast Air Quality Management District  (SCAQMD) nor the San Joaquin Valley Air Pollution Control District (SJVAPCD).

48VT-K: Product Data

Model Number Nomenclature

SAP ORDERING NO.| VOLTS– PHASE (60 HZ)| NOMINAL COOLING CAPACITY (BTUH)| NOMINAL HEATING INPUT (BTUH)| APPROX SHIP. WT (LBS)
---|---|---|---|---
48VT-K240603| 208/230-1| 24000| 60000| 373
48VT-K300603| 208/230-1| 30000| 60000| 406
48VT-K360903| 208/230-1| 36000| 90000| 461
48VT-K420903| 208/230-1| 42000| 90000| 477
48VT-K480903| 208/230-1| 48000| 90000| 491
48VT-K481153| 208/230-1| 48000| 115000| 491
48VT-K601153| 208/230-1| 60000| 115000| 554
48VT-K601303| 208/230-1| 60000| 127000| 554
Low NOx Units
48VTNK240603| 208/230-1| 24000| 60000| 373
48VTNK300603| 208/230-1| 30000| 60000| 406
48VTNK360903| 208/230-1| 36000| 90000| 461
48VTNK420903| 208/230-1| 42000| 90000| 477
48VTNK480903| 208/230-1| 48000| 90000| 491
48VTNK481153| 208/230-1| 48000| 115000| 491
48VTNK601153| 208/230-1| 60000| 115000| 554
48VTNK601303| 208/230-1| 60000| 127000| 554

Cooling Capacities and Efficiencies

UNIT SIZE| NOMINAL TONS| STANDARD CFM| COOLING CAPACITY| EER2| SEER2
---|---|---|---|---|---
24| 2| 750| 22200| 11.05| 13.4
30| 2.5| 950| 29400| 11.05| 13.4
36| 3| 1150| 33400| 11.05| 13.4
42| 3.5| 1350| 40000| 11.05| 13.4
48| 4| 1600| 47000| 11.05| 13.4
60| 5| 1750| 55000| 11.05| 13.4

Heat Pump Heating Capacities and Efficiencies

UNIT| HEATING CAPACITY (BTUH) @ 47°F (8.3°C)| COP @ 47°F (8.3°C)| HEATING CAPACITY (BTUH) @ 17°F (-8.3°C)| COP @ 17°F (-8.3°C)| HSPF2
---|---|---|---|---|---
24| 24000| 3.7| 12500| 2.20| 6.7
30| 30000| 3.6| 17700| 2.30| 6.7
36| 35000| 3.8| 18400| 2.30| 6.7
42| 40000| 3.7| 22400| 2.30| 6.7
48| 46000| 3.7| 25000| 2.30| 6.7
60| 57000| 3.5| 32200| 2.40| 6.7

LEGEND
dBA-Sound Levels (decibels)
db—Dry Bulb
SEER2—Seasonal Energy Efficiency Ratio
wb—Wet Bulb
COP-Coefficient of Performance
HSPF2-Heating Season Performance Factor

• Air Conditioning, Heating & Refrigeration Institute.
  **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 U.S. Government DOE Department of Energy) test procedures and/or AHRI Standards 210/240.

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 (19.4°C) wb indoor entering-air temperature and 95°F (35°C) db outdoor entering-air temperature.

2. Before purchasing this appliance, read important energy cost and efficiency information available from your retailer.

Gas Heating Capacities and Efficiencies, Single Phase Models Models

UNIT SIZE| HEATING INPUT (Btuh)| OUTPUT CAPACITY (Btuh)| TEMPERATURE RISE RANGE F (C)| AFUE (%)
---|---|---|---|---
24060| 60,000| 49,000| 25-55 (13.9-30.6)|
30060|
36090| | | |
42090
48090| 90,000| 74,000| 35-65 (19.4-36.1)| 81.0
48115| 115,000| 94,000| 30-60 (16.7-33.3)|
60115|
60130| 130,000| 104,000| 35-65 (19.4-36.1)|

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

Physical Data

420 +/- 25
Loss-of-Charge/Low Pressure Switch (psig) Cutout Reset (Auto)| 20 +/- 5
45 +/- 10
| | 1 each 24x16x1 in.
Return Air Filters†‡| 2 each 20x12x1 in.| 610x406x25 mm
disposable| 508x305x25 mm| 24x14x1 in.
610x356x25 mm

*. 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 high-capacity type. Air filter pressure drop for non-standard filters must not exceed 0.08 IN. W.C.
‡. If using accessory filter rack refer to filter rack installation instructions for correct filter size and quantity.

Shipping Weight (lb)
Shipping Weight (kg)| 491
223| 491
223| 554
251| 554
251
Compressor / Quantity| Scroll / 1
Refrigerant| R-410A
Refrigerant Quantity (lb) Refrigerant Quantity (kg)| 10.0
4.5| 13.25
6.0
Refrigerant Metering Device| Indoor Accurator, Outdoor Dual Accurator| Indoor TXV, Outdoor Dual Accurator
Orifice ID (in) Orifice ID (mm)| 0.080 (1) 2.03 (1)| N/A
Orifice OD (in) Orifice OD (mm)| 0.046 (2) 1.17 (2)| 0.046 (2) 1.17(2)
Outdoor Coil Rows… Fins/in, Face Area (sq. ft.)| 2…21
13.6| 2…21
17.5
Outdoor Fan
Nominal Airflow (CFM) Diameter (in.) Diameter (mm)
Motor hp Motor (rpm)| 3500
26
660
1/5 (810)| 3500
26
660
1/5 (810)
Indoor Coil Rows… Fins/in, face area (sq. ft.)| 3…17
5.6
Indoor Blower Nominal Airflow (cfm) Size (in.)
Size (mm) Motor hp| 1600
11 x 10
279 x 254
1| 1750
11 x 10
279 x 254
1
Furnace Section* Burner Orifice
1 Phase Natural Gas Qty…Drill Size 1 Phase Propane Gas Qty…Drill Size| 3…38
3…53| 3…33
3…51| 3…33
3…51| 3…31
3…49
High Pressure Switch (psig)
Cutout Reset (Auto)| 650 +/- 15
420 +/- 25
Loss-of-Charge/Low Pressure Switch (psig)
Cutout Reset (Auto)| 20 +/- 5
45 +/- 10
Return Air Filters† ‡ disposable| 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 high-capacity type. Air filter pressure drop for non-standard filters must not exceed 0.08 IN. W.C.
‡. If using accessory filter rack refer to filter rack installation instructions for correct filter size and quantity.

A-Weighted Sound Power Level (dBA)

UNIT SIZE| STANDARD
RATING (dBA)| TYPICAL OCTAVE BAND SPECTRUM (dBA without tone adjustment)
---|---|---
125| 250| 500| 1000| 2000| 4000| 8000
24| 69.9| 59.0| 56.6| 57.9| 60.9| 55.3| 51.7| 44.0
30| 73.1| 55.9| 57.0| 63.1| 63.7| 59.7| 54.2| 48.8
36| 72.0| 52.2| 56.7| 62.7| 62.6| 60.0| 55.3| 49.3
42| 73.7| 54.5| 61.3| 63.5| 63.5| 60.5| 58.2| 53.3
48| 74.0| 56.9| 59.3| 63.9| 64.5| 61.7| 55.4| 47.4
60| 74.7| 60| 61.6| 63.8| 63.5| 62.0| 59.3| 50.3

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

controller, gear driven, fully modulating damper, spring return actuator, up to 50% barometric relief, supply and dry bulb outdoor air sensors. Includes filter rack with 1” filters.| 24-30
CPECOMZR008A00| 36-42
CPECOMZR009A00| 48-60
CPECOMZR010A00| Dedicated Horizontal Economizer – Internal with solid state controller, fully modulating damper, spring return actuator, supply and dry bulb outdoor air sensor, and low ambient compressor lockout switch included. Includes filter rack with 1-inch filters.| 24-30
CPECOMZR011A00| 36-42
CPECOMZR012A00| 48-60
CPRLYKIT001A00| Economizer relay for heat pumps| 48-60
AXB078ENT†| Outdoor Enthalpy Control| ALL
CPMANDPR007A00| Manual Outside Air Damper – (Includes filter rack and 1” filter, same as CPFILTRK kit)| 24-30
CPMANDPR008A00| 36-42
CPMANDPR009A00| 48-60
CPFILTRK007A00| Internal Filter Rack| 24-30
CPFILTRK008A00| 36-42
CPFILTRK009A00| 48-60
CPCRKHTR008A00| 240V Crankcase Heater| 24 – 36
CPCRKHTR004A00| 42 – 60
CPLOWAMB001A00‡| Low Ambient Control| ALL
CPHSTART002A00| PTC Compressor Start Assist Kit (single phase only)| ALL
CPLPCONV013C00| Natural Gas to Propane Conversion Kit (0 – 2000 ft)| ALL
CPLPCONV014C00| Natural Gas to Propane Conversion Kit (2001 – 6000 ft)
CPNGCONV004C00| Propane to Natural Gas Conversion Kit (0 – 2000 ft)
CPFLUEDS001A00| Flue Discharge Deflector Assembly| ALL
CPDUCFLG002A00| Square to Round (1 set of 2, use with horizontal duct flanges only)| 24 – 48
HN65KJ016| Relay Pilot Duty| ALL

** CPRFCURB011B00 can be used with 42-60 size units with same overhang.
† Outdoor enthalpy available as field installed accessory; Filter rack and 1” filter, same as CPFILTRK kit
‡ Relay –HN–65KJ-016 is required with this Low Ambient Control when used in heat pump application.

ECONOMIZER

Unit Dimensions

24-30

36-60

Accessory Dimensions

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.

IMPORTANT: Do not install large base pan HYBRID HEAT units onto the small base pan (common curb). The center of gravity on a large base pan HYBRID HEAT unit could overhang the curb causing an unsafe condition. Before  installing any large base pan unit onto the common curb, check the “Y” distance in the product literature dimensional drawing to ensure that “Y” is greater than 14 in. (356 mm). Do not install any large base pan unit onto the common  curb with a “Y” dimension (center of gravity) less than 14 in. (356 mm).
Selection Procedure (with example)
DETERMINE COOLING AND HEATING REQUIREMENTS AT DESIGN CONDITIONS:
Given:
Required Cooling Capacity (TC) …………………………………29,000 Btuh
Sensible Heat Capacity (SHC)…………………………………….21,000 Btuh
Required Heating Capacity…………………………………………48,000 Btuh
Condenser Entering Air Temperature …………………………..95°F (35°C)
Indoor-Air Temperature ………………80°F (27°C) ed 67°F (19°C) web
Evaporator Air Quantity………………………………………………. 1000 CFM
External Static Pressure ………………………………………… 0.300 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 30 at 950 CFM and 67°F (19°C) web (entering wet bulb) will provide a total capacity of 29,400 Btuh and a SHC of 26,950 Btuh. Calculate SHC correction, if required, using Note 4 under Cooling Capacities tables.
SELECT HEATING CAPACITY OF UNIT TO PROVIDE DESIGN CONDITION REQUIREMENT.
In the Gas Heating Capacities and Efficiencies table, note that the 30060 size unit will deliver a gas heat capacity of 49,000 BTUH with an input of 60,000 BTUH, which meets the heating capacity requirement.
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:

Enter the table for Dry Coil Air Delivery—At 0.43 IN. W.C. ESP (external static pressure) and MED-HIGH speed the motor delivers between 1037 CFM and 987 cfm. Interpolation estimates 1022 CFM at .43 IN. W.C. MED-HIGH 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 Cooling Extended Performance Table

24 Heating Extended Performance Table -10-60_F (-23.3-15.6_C)   
Performance Data
30 Cooling Extended Performance Table

30 Heating Extended Performance Table -10-60_F (-23.3-15.6_C)
Performance Data
36 Cooling Extended Performance Table

36 Heating Extended Performance Table -10-60_F (-23.3-15.6_C)

Performance Data
 
Performance Table

48VT-K: Product Data
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 (26.7 _C) edb temperature of air entering evaporator coil. Below 80_F (26.7_C) edb, subtract (corer factor x cfm) from SHC. Above 80_F(26.7_C) edb, add (corer 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.

Performance Data
Natural Gas Orifice Sizes and Manifold Pressure, Single Phase Models

Nameplate Input (Btu/hr)| | ALTITUDE OF INSTALLATION (FT. ABOVE SEA LEVEL) U.S.A.
---|---|---
0 to 2000 (0-610 m)| 2001 to 3000   (611 to 914 m)| 3001 to 4000 (915 to 1219 m)| 4001 to 5000 (1220 to 1524 m)| 5001 to 6000 (1524 to 1829 m)
60000| Orifice No. (Qty)| 44 (3)| 45 (3)†| 48 (3)†| 48 (3)†| 48 (3)†
Manifold Press. (in. W.C.)| 3.2| 3.2| 3.8| 3.5| 3.2
90000| Orifice No. (Qty)| 38 (3)| 41 (3)†| 41 (3)†| 42 (3)†| 42 (3)†
Manifold Press. (in. W.C.)| 3.6| 3.8| 3.4| 3.4| 3.2
115000| Orifice No. (Qty)| 33 (3)| 36 (3)†| 36 (3)†| 36 (3)†| 38 (3)†
Manifold Press. (in. W.C.)| 3.8| 3.8| 3.6| 3.3| 3.6
127000| Orifice No. (Qty)| 31 (3)| 31 (3)| 33 (3)†| 33 (3)†| 34 (3)†
Manifold Press. (in. W.C.)| 3.7| 3.2| 3.5| 3.2| 3.2

*. In the U.S.A., the input rating for altitudes above 2000 ft (610m) must be reduced by 4% for each 1000 ft (305 m) above sea level.
In Canada, the input rating for altitudes from 2001 to 4500 ft (611 to 1372 m) above sea level must be derated by 10% by an authorized gas conversion station or dealer.
For Canadian Installations from 2000 to 4500 ft, use U.S.A. column 2001 to 3000 ft.
Note: Orifice sizes and manifold pressure settings are based on natural gas with a heating value of 1025 Btu/ft3 and a specific gravity of .6.
†. Orifices available through your distributor.
Propane Gas Orifice Sizes and Manifold Pressure, Single Phase Models

Nameplate Input (Btu/hr)| | ALTITUDE OF INSTALLATION (FT. ABOVE SEA LEVEL) U.S.A.
---|---|---
0 to 2000 (0-610 m)| 2001 to 3000 (611 to 914 m)| 3001 to 4000 (915 to 1219 m)| 4001 to 5000 (1220 to 1524 m)| 5001 to 6000 (1524 to 1829 m)
60000| Orifice No. (Qty)| 55 (3)| 56 (3)| 56 (3)| 56 (3)| 56 (3)
Manifold Press. (IN. W.C.)| 10.0| 11.0| 11.0| 11.0| 10.7
90000| Orifice No. (Qty)| 53 (3)| 54 (3)| 54 (3)| 54 (3)| 54 (3)
Manifold Press. (IN. W.C.)| 10.0| 11.0| 11.0| 11.0| 11.0
115000| Orifice No. (Qty)| 51 (3)| 52 (3)| 52 (3)| 53 (3)| 53 (3)
Manifold Press. (IN. W.C.)| 10.0| 11.0| 10.6| 11.0| 11.0
127000| Orifice No. (Qty)| 49 (3)| 50 (3)| 51 (3)| 52 (3)| 52 (3)
Manifold Press. (IN. W.C.)| 10.0| 11.0| 11.0| 11.0| 11.0

*. In the U.S.A., the input rating for altitudes above 2000 ft (610m) must be reduced by 4% for each 1000 ft (305 m) above sea level.
In Canada, the input rating for altitudes from 2001 to 4500 ft (611 to 1372 m) above sea level must be derated by 10% by an authorized gas conversion station or dealer.
For Canadian Installations from 2000 to 4500 ft (610-1372 m), use U.S.A. column 2001 to 3000 ft (611 to 914 m).
High Altitude Compensation, Propane Gas, Single Phase Models

Nameplate Input (Btu/hr)| **Rated Heating Input (Btu/hr), Propane Gas at Installation Altitude Above Sea Level, U.S.A. *
---|---
0 to 2000 ft
(0-610 m)| 2001 to 3000 ft
(611 to 914 m)| 3001 to 4000 ft
(915 to 1219 m)| 4001 to 5000 ft
(1220 to 1524 m)| 5001 to 6000 ft
(1524 to 1829 m)**
60000| 57000| 47500| 47500| 47500| 46900
90000| 79000| 68900| 68900| 68600| 68600
115000| 103000| 100400| 98900| 83000| 83000
127000| 116000| 115500| 111800| 101300| 100400

*. In the U.S.A., the input rating for altitudes above 2000 ft (610m) must be reduced by 4% for each 1000 ft (305 m) above sea level.
In Canada, the input rating for altitudes from 2001 to 4500 ft (611 to 1372 m) above sea level must be derated by 10% by an authorized gas conversion station or dealer.
For Canadian Installations from 2000 to 4500 ft (610-1372 m), use U.S.A. column 2001 to 3000 ft (611 to 914 m).
High Altitude Compensation, Natural Gas, Single Phase Models

Nameplate Input (Btu/hr)| Rated Heating Input (Btu/hr), Natural Gas at Installation Altitude Above Sea Level, U.S.A. *
---|---
0 to 2000 ft
(0-610 m)| 2001 to 3000 ft*
(611 to 914 m)| 3001 to 4000 ft
(915 to 1219 m)| 4001 to 5000 ft
(1220 to 1524 m)| 5001 to 6000 ft
(1524 to 1829 m)**
60000| 60000| 54000| 51600| 49200| 46800
90000| 90000| 81000| 77400| 73800| 70200
115000| 115000| 103500| 98900| 94300| 89700
127000| 127000| 143000| 109200| 104100| 99100

*. In the U.S.A., the input rating for altitudes above 2000 ft (610m) must be reduced by 4% for each 1000 ft (305 m) above Sea level.
In Canada, the input rating for altitudes from 2001 to 4500 ft (611 to 1372 m) above sea level must be derated by 10% by an authorized gas conversion station or dealer.
For Canadian Installations from 2000 to 4500 ft (610-1372 m), use U.S.A. column 2001 to 3000 ft (611 to 914 m).
*Dry Coil Air Delivery – Horizontal and Downflow Discharge Sizes 24-60 208/230 VAC – 1 Phase**  

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

48VT-K: Product Data

Typical Piping and Wiring

Application Data

Condensate trap — A 2-in. (51 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. The unit is factory equipped with duct covers to seal the horizontal discharge openings in the unit. Units installed in horizontal discharge  orientation do not require duct covers.
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 in cooling mode. Airflow can be lower in certain modes when humidity removal is an issue.
Minimum ambient cooling operation temperature — All standard units have a minimum ambient cooling operating temperature of 40_F (4.4_C). With accessory low ambient temperature kit, units can operate at temperatures down to  0_F (-17.8_C).
Maximum operating outdoor air temperature for cooling is 125_F (51.7_C).

Balance Point Worksheet

Electrical Data

MODEL| NOMINAL
V-PH-HZ| VOLTAGE RANGE| COMPRESSOR| OFM| IFM| IDM| POWER SUPPLY
---|---|---|---|---|---|---|---
MIN| MAX| RLA| LRA| FLA| FLA| FLA| MCA| MOCP
24060| 208/230-1-60| 197| 253| 11.1| 59.5| 0.7| 3.5| 0.65| 18.1| 25
30060| 208/230-1-60| 197| 253| 13.2| 72.2| 1.2| 3.9| 0.65| 21.6| 30
36090| 208/230-1-60| 197| 253| 16| 91.9| 1.2| 3.8| 0.65| 25| 40
42090| 208/230-1-60| 197| 253| 18.6| 110| 1.1| 5.8| 0.65| 30.2| 45
48090, 48115| 208/230-1-60| 197| 253| 19.7| 130| 1.2| 6.9| 0.65| 32.7| 50
60115| 208/230-1-60| 197| 253| 27.7| 124.5| 1.1| 6.9| 0.65| 42.6| 60
60130| 208/230-1-60| 197| 253| 27.7| 124.5| 1.1| 6.9| 0.75| 42.6| 60

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 multimotored 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. If other 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

EXAMPLE: Supply voltage is 230-3-60.

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.
Typical Connection Wiring Schematic – 208/230-1-60
CONNECTION WIRING DIAGRAM
DANGER: ELECTRICAL SHOCK HAZARD DISCONNECT POWER BEFORE SERVICING

Typical Ladder Wiring Schematic – 208/230-1-60
LADDER WIRING DIAGRAM
DANGER: ELECTRICAL SHOCK HAZARD DISCONNECT POWER BEFORE SERVICING Controls
Operating Sequence
When power is supplied to unit, the transformer (TRAN) is energized.
On units with crankcase heater, heater is also energized.
Cooling — With the thermostat subbase in the cooling position, the thermostat makes circuit “R” to “O”. This energizes the reversing valve solenoid (RVS) and places the unit in standby condition for cooling. As the space temperature rises, the thermostat closes circuit “R” to “Y1/Y”. A circuit is made to contactor (C), starting the compressor (COMP) and outdoor-fan motor (OFM). Circuit “R” to “G” is made at the same time and starts the indoor-fan motor (IFM).
On the loss of the thermostat call for cooling, 24 V is removed from both the “Y1/Y” and “G” terminals (provided the fan switch is in the “AUTO” position) de-energizing the compressor contactor and opening the contacts supplying power  to compressor/OFM. After a 60-second delay (1 phase models) the IFM shuts off. If the thermostat fan selector switch is in the “ON” position, the IFM will run continuously.
Gas Heating (Single Phase Models)
On a call for heating, terminal W of the thermostat is energized, starting the induced-draft motor for a 5 second pre-purge. 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). The indoor (evaporator) –fan motor is energized 30 seconds after flame is established. When the thermostat is satisfied and W is de- energized, the  burners 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 reduce the indoor fan motor on delay and increase the indoor fan motor off delay in the event of high duct static and/or a partially-clogged filter.
Guide Specifications
Packaged HYBRID HEAT Units HVAC Guide Specifications
Size Range: 2 to 5 Tons, Nominal Cooling 40,000 to 127,000 Btuh, Nominal Heating Input
General
System Description
Outdoor, packaged, air-to-air heat pump unit utilizing a hermetic scroll compressor for cooling duty and optional electric heating. Unit shall discharge supply air vertically or horizontally as shown on contract drawings. Outdoor 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 Z21.47.
– 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 90A requirements for flame spread and smoke generation.
– Cabinet insulation shall meet ASHRAE Standard 62P.
DELIVERY, STORAGE AND HANDLING
– Unit shall be stored and handled per manufacturer’s recommendations.
Products
EQUIPMENT
General:
Factory-assembled, single-piece, heat pump unit. Contained within the enclosure shall be all factory wiring, piping, controls, refrigerant charge (R-410A), and special features required prior to field start-up.
Unit Cabinet:
– Unit cabinet shall be constructed of phosphate, zinc-coated, pre-painted steel capable of withstanding 500 hours of 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.
– Indoor fan compartment top surface shall be insulated with a minimum 1/2-in. (13 mm) thick, flexible fiberglass insulation, coated on the air side and retained by adhesive and mechanical means. The indoor 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.
– Metal Insulated Duct Covers for side discharge will be standard on all sizes.
– Unit insulation conforms to ASHRAE 62P.
Fans:
– The evaporator fan motor shall be a ECM Motor.
– 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.
– Scroll compressors shall be standard on all units.
Coils:
Indoor coils shall have aluminum plate fins mechanically bonded to seamless aluminum tubes with all joints brazed. Tube sheet openings shall be belled to prevent tube wear. Outdoor coil shall have aluminum fins with copper tubing.
Refrigerant Metering Device:
Refrigerant metering device shall be thermostatic expansion valve or fixed orifice for cooling, and fixed orifice for heating.
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.
– Units shall incorporate an internal compressor protector that provides reset capability.
Operating Characteristics:
– Unit shall be capable of starting and running at 125_F (51.7_C) ambient outdoor temperature.
– Compressor with standard controls shall be capable of operation down to 40_F (4.4_C) ambient outdoor temperature in cooling mode.
– Unit shall be provided with 60-second fan time (single phase), 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.”
Low NOx:
Shall provide NOx reduction to meet 40 ng/J NOx emissions requirements as shipped from the factory.
Special Features Available:

1. Compressor Start Kit
   Shall provide additional starting torque for single-phase compressors.

2. Thermostat:
   To provide for HYBRID HEAT two stage heating and one stage cooling in addition manual or automatic changeover and indoor fan control.

3. Crankcase Heater:
   Shall provide anti-flood back protection for low load cooling applications.

4. 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.

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

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

7. Flue Discharge Deflector
   Directs flue gas exhaust 90 degrees upward from current discharge.
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8. Cabinet air leakage of 2.0% or less at .5 in. W.C. when tested in accordance with ASHRAE standard 193. Available as a factory installed option.

9. High Altitude Propane Conversion Kit
   Shall consist of all required hardware to convert to propane gas heat operation at 2001 to 6000 ft (611 to 1829 m) above sea level.

10. Low Ambient Package:
    Shall consist of a solid-state control and outdoor coil temperature sensor for controlling outdoor-fan motor operation, which shall allow unit to operate down to 0_F (17.7_C) outdoor ambient temperature.

11. Manual Outdoor Air Damper:
    Package shall consist of damper, bird screen, and rain hood which can be preset to admit outdoor air for year-round ventilation.

12. Natural-to-Propane Conversion Kit:
    Shall be complete with all required hardware to convert to propane gas operation at standard altitude (0 to 2000 ft [0-610 m] above sea level).

13. Propane-to-Natural Conversion Kit:
    Shall be complete with all hardware to convert to natural gas at standard altitude (0 to 2000 ft [0 to 610 m] above sea level).

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

15. Louver Metal Outdoor Coil Grille
    Shall provide hail and vandalism protection.

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© 2023 Carrier. All rights reserved.
Edition Date: 12/23
Catalog No: 48VT-22PD
Replaces: 48VT-21PD
Manufacturer reserves the right to change, at any time,
specifications and designs without notice and without obligations.

References

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