Carrier 48VG Ultra Low NOx Performance 15 Packaged Gas Furnace and AC System Owner’s Manual

48VG Ultra Low NOx
Performance™ 15.2+ SEER2
2-Stage Packaged Air Conditioner and Single Stage Gas Furnace
System With Puron® (R-410A) Refrigerant
Single and Three Phase
2-5 Nominal Tons (Sizes 24-60)
48VG Ultra Low NOx: Owner’s Information Manual

48VG Ultra Low NOx Performance 15 Packaged Gas Furnace and AC System

NOTE TO EQUIPMENT OWNER:

For your convience, please record the model and serial numbers of your new equipment in the spaces provided. This information, along with the installation data and dealer contact information, will be helpful should your system require maintenance or service.

UNIT INFORMATION
Model # __
Serial # __
ACCESSORIES (List type of model #)____
INSTALLATION INFORMATION
Date Installed__
DEALERSHIP CONTACT INFORMATION
Company Name
Address___
Phone Number_
Technician Name_____

NOTE TO INSTALLER:
This manual must be left with the eqipment owner.

Our products are designed, tested and built in accordance with DOE standardized procedures; however, actual operating results and efficiencies may vary based on manufacturing and supplier tolerances, equipment configuration, operating conditions and installation practices.

Safety Considerations

Improper installation, adjustment, alteration, service maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, personal injury, or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product.
Refer to the individual instructions packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit. consult local building codes, the current editions of the National Fuel Gas Code (NFGC) NFPA 54/ANSI Z223.1, and the National Electrical Code (NEC) NFPA 70.
In Canada refer to the current editions of the National Standards of Canada CAN/CSA-B149.1 and.2 Natural Gas and Propane Installation codes, and Canadian Electrical Code CSA C22.1 Recognize safety information. This is the safety- alert symbol. When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand these signal words: DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is
used to identify unsafe practices which may result in minor personal injury or product and property damage.
NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.
NOTE: Installer: This manual should be left with the equipment user.

WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury and/or death.
Carbon Monoxide (CO) is a colorless, odorless, and tasteless poisonous gas that can be fatal when inhaled. Follow all installation, maintenance, and service instructions. See additional information below regarding the installation of a CO Alarm.
Most states is the USA and jurisdictions in Canada have laws that require the use of Carbon Monoxide (CO) alarms with fuel burning products. Examples of fuel burning products are furnaces, boilers, space heaters, generators, water heaters, stoves/ranges, clothes dryers, fireplaces, incinerators, automobiles, and other internal combustion engines. Even if there are no laws in your jurisdiction requiring a CO Alarm, it’s highly recommended that whenever any fuel burning product is used in or around the home or business that the dwelling be equipped with a CO Alarm(s). The Consumer Product Safety Commission recommends the use of CO Alarm(s). The CO Alarm(s) must be installed, operated, and maintained according to the CO Alarm manufacturer’s instructions. For more information about Carbon Monoxide, local laws, or to purchase a CO Alarm, please visit the following website https://www.kidde.com

WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury, death or property damage.
Installation and servicing of this equipment can be hazardous due to mechanical and electrical components. Only trained and qualified personnel should install, repair, or service this equipment.

WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death, and/or property damage.
Do not store or use combustible materials, gasoline, or other flammable vapors and liquids in the vicinity of this or any other appliance.

WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury, death or property damage.
Do not use this unit if any part has been under water. Immediately call a qualified service technician to inspect the unit and to replace any part of the control system which has been under water.

WARNING
FIRE AND EXPLOSION HAZARD
Failure to follow safety warning exactly could result in serious injury, death or property damage.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
– Do not try to light any appliance.
– Do not touch any electrical switch; do not use any phone in your building.
– Leave the building immediately.
– Immediately call your gas supplier from a neighbor’s phone.
Follow the gas supplier’s instructions.
– If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency or the gas supplier.

WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury and/or death.
Before performing recommended maintenance, be sure the main power switch to unit is turned off and lock-out tag is installed. There may be more than one disconnect switch.

WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury, death and/or property damage.

1. Do not turn off the electrical power to unit without first turning off the gas supply.
2. Before attempting to start the gas heating section, familiarize yourself with all the procedures that must be followed.

WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death, and/or property damage.
Do not attempt to light by hand. Never attempt to manually light the main burners on unit with a match, lighter, or any other flame. If the electric sparking device fails to light the main burners, refer to the following shutdown procedures, then call your dealer as soon as possible.
CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury.
When removing access panels or performing maintenance functions inside your unit, be aware of sharp sheet metal parts and screws.
Although special care is taken to reduce sharp edges to a minimum, be extremely careful and wear appropriate protective clothing, safety glasses and gloves when handling parts or reaching into the unit.

Unit Introduction
This unit is a small packaged gas heat/electric cooling system that utilizes the comfort of gas heating packaged along with efficient electric air conditioning. This unit uses Puron®, the environmentally balanced refrigerant for cooling.
Starting or Shutting Off Unit
NOTE: Your combination heating/cooling unit is equipped with an automatic direct spark ignition and power combustion blower.
To start unit gas heat:
Refer to Fig. 2 for location of unit front access panel. Refer to Fig. 3 for location of gas valve. Refer to Fig. 4 while proceeding with the following steps.

1. Set the temperature selector on room thermostat to the lowest temperature setting and set system switch to HEAT.
2. Close the external manual gas shutoff valve.
3. Turn off the electrical supply to the unit.
4. Remove the control access panel with a 5/16-in. nut driver. (See Fig. 2.)
5. Move the selector switch on the internal gas valve to the OFF position and wait 5 minutes.
6. Move the selector switch on the internal gas valve to the ON position.
7. Replace the control access panel.
8. Turn on the electrical supply to unit.
9. Open the external manual gas shutoff valve.
10. Set the temperature selector on room thermostat slightly above room temperature to start unit. The induced-draft combustion air fan will start. Main gas valve will open and main burners should ignite within 25 seconds. If the burner does not light within 25 seconds, the ignition module will go into a Retry Mode after a period of approximately 20 seconds (following the 7-second ignition period). If the burners do not light by the 4th ignition try of the initial call for heat, there is a lockout.
11. Set the temperature selector on room thermostat to desired setting.

WARNING
FIRE AND EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death, and/or property damage.

1. If the main burners fail to light, or the blower fails to start, shut down gas heating section and call your dealer for service.
2. Never attempt to manually light the main burners on unit with a match, lighter, or any other flame. If the electric sparking device fails to light the main burners, refer to the following shutdown procedures, then call your dealer as soon as possible.

![Carrier 48VG Ultra Low NOx Performance 15 Packaged Gas Furnace and AC System

• Gas Heating](https://manuals.plus/wp-content/uploads/2023/02/Carrier-48VG- Ultra-Low-NOx-Performance-15-Packaged-Gas-Furnace-and-AC-System-Gas- Heating.png)

To shut off unit gas heat:

WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury, death, and/or property damage.
Do not turn off the electrical power to unit without first turning off the gas supply.

NOTE: If the unit is being shut down because of a malfunction, call your dealer as soon as possible.
Should overheating occur or the gas supply fail to shut off, shut off the external manual gas valve to the unit before shutting off the electrical supply. Do not use this unit if any part has been under water.
Immediately call a qualified service technician to inspect the unit and to replace any part of the control system and any gas control which has been under water.
Refer to Fig. 5 while proceeding with the following steps.

1. Set the temperature selector on room thermostat to lowest temperature setting and set system SWITCH to OFF.
2. Close the external manual shutoff valve.
3. Turn off the electrical power supply to the unit.
4. Remove the control access panel. (See Fig. 2.)
5. Move the selector switch on the internal gas valve to the OFF position.
6. Replace the control access panel.

To start unit electric cooling:
Refer to Fig. 6 while proceeding with the following steps.

1. Set the temperature selector on room thermostat to highest temperature setting and set system SWITCH to OFF.
2. Close the external manual shutoff valve, if not already closed.
3. Turn ON the electrical power supply to the unit.
4. Set system switch to COOL.
5. Set the temperature selector on room thermostat slightly below the room temperature to start unit.

To shut off unit electric cooling:
Refer to Fig. 7 while proceeding with the following steps.

1. Set the temperature selector on room thermostat to highest temperature setting and set system SWITCH to OFF.
2. Close the external manual shutoff valve, if not already closed.
3. Turn off the electrical power supply to the unit.

Operating Your Unit

The operation of your unit is controlled by the indoor temperature control (thermostat). You simply adjust the thermostat and it maintains the indoor temperature at the level you select. Most thermostats of heating and cooling systems have 3 controls: a temperature control selector, a FAN control, and a SYSTEM or MODE control. Refer to your
thermostat owner’s manual for more information.
To better protect your investment and to eliminate unnecessary service calls, familiarize yourself with the following facts:
Cooling Mode
With the SYSTEM control set to COOL, your unit will run in cooling mode until the indoor temperature is lowered to the level you have selected. On extremely hot days, your unit will run for longer periods at a time and have shorter “off” periods than on moderate days.
Gas Heat Mode
With the SYSTEM or MODE control of your indoor thermostat set to HEAT, your unit will run in heating mode until room temperature is raised to the level you have selected. On cold days and nights, your system will typically run for longer periods of time and have shorter “off” periods than on moderate days.

Maintenance and Service

This section discusses maintenance that should be performed on your system. Most maintenance should be performed by your dealer. You, as the owner, may wish to handle some minor maintenance for your new unit.
Routine Maintenance
All routine maintenance should be handled by skilled, experienced personnel. Your dealer can help you establish a standard procedure.
For your safety, keep the unit area clear and free of combustible materials, gasoline, and other flammable liquids and vapors. To assure proper functioning of the unit, flow of condenser air must not be obstructed from reaching the unit. Clearance from the top of the unit is 48 in. (1219 mm). Clearance of at least 36 in. (914 mm) is required on
sides except the power entry side (42 in. (1067 mm) clearance) and the duct side (12 in. (305 mm) minimum clearance). Also, ensure that the return-air duct connection (s) is physically sound, is sealed to the furnace casing, and terminates outside the space containing the furnace.
Maintenance and Care for the Equipment Owner
Before performing equipment maintenance yourself, please carefully consider the following:

WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK AND CUT HAZARD
Failure to follow this warning could result in personal injury, death or property damage.

1. Turn off gas supply first, then all electrical power to your unit and install lock-out tag before servicing or performing maintenance.
2. When removing access panels or performing maintenance functions inside your unit, be aware of sharp sheet metal parts and screws. Although special care is taken to reduce sharp edges to a minimum, be extremely careful when handling parts or reaching into the unit. Wear safety glasses, gloves, and appropriate protective clothing.

Clear Away Debris and Vegetation Near Unit
To assure proper functioning of the unit, flow of condenser air must not be obstructed from reaching the unit. Clearance from the top of the unit is 48 in. (1219 mm). Clearance of at least 36 in. (914 mm) is required on sides except the power entry side (42 in. [1067 mm] clearance) and the duct side (12 in. [305 mm] minimum clearance). Also, ensure that the return-air duct connection (s) is physically sound, is sealed to the furnace casing, and terminates outside the space containing the furnace.

Air Filters
CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution may result in property damage.
Never operate your unit without filters in place. An accumulation of dust and lint on internal parts of your unit can cause loss of efficiency and blower motor and/or compressor damage.
The air filter(s) should be checked every 3 or 4 weeks and changed or cleaned whenever it becomes dirty. Dirty filters produce excessive stress on the blower motor and can cause the motor to overheat and shut down.
This unit must have air filters in place before it can be operated. These filters can be located in one of at least two places. In many applications, the installer will provide return air filter grilles mounted on the wall or ceiling of the conditioned structure. In the instance of filter grilles, the filters can simply be removed from the grille and replaced.
The other typical application is an accessory filter rack installed inside the unit itself. The following information is given to assist in changing filters used in these internal filter racks.
Filter kits are available as a purchased accessory or a factory installed option. The same filter kit is included with the accessory economizers and factory installed economizers.

Table 1 – Indoor Air Filter Data

• Units with bent indoor coil.

![Carrier 48VG Ultra Low NOx Performance 15 Packaged Gas Furnace and AC System

• Unit Gas Heat](https://manuals.plus/wp-content/uploads/2023/02/Carrier-48VG- Ultra-Low-NOx-Performance-15-Packaged-Gas-Furnace-and-AC-System-Unit-Gas- Heat.png)

To replace or inspect filters in accessory filter rack (See Fig. 2):

1. Remove the filter access panel using a 5/16-in. nut driver.

2. Remove the filter(s) by pulling it out of the unit. If the filter(s) is dirty, clean or replace with a new one.
   When installing the new filter(s), note the direction of the airflow arrows on the filter frame which should be pointing at the indoor coil.

3. Reinstall filter access panel ensuring opening is air and water tight.

If you have difficulty locating your air filter(s) or have questions concerning proper filter maintenance, contact your dealer for instructions. When replacing filters, always use the same size and type of filter that was supplied originally by the installer. See Table 1 for filter sizes supplied with accessory filter rack.
Fans and Fan Motors
Periodically check the condition of fan wheels and housings and fan motor shaft bearings. Contact your dealer for the required annual maintenance.
Heat Exchanger
To ensure dependable and efficient heating operation, the heat exchanger should be checked by a qualified maintenance person before each heating season, and cleaned when necessary. This checkout should not be attempted by anyone not having the required expertise and equipment to properly do the job. Contact your dealer for the required periodic maintenance.
Indoor and Outdoor Coils
Cleaning of the coils should only be done by qualified service personnel.
Contact your dealer for the required annual maintenance.
Condensate Drain
The drain pan and condensate drain line should be checked and cleaned at the same time the cooling coils are checked by your dealer.
Compressor
All compressors are factory shipped with a normal charge of the correct type of refrigeration grade oil.
Condenser (Outdoor) Fan

WARNING
PERSONAL INJURY AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal injury, death or property damage.
Do not insert sticks, screwdrivers, or any other objects into revolving fan blades.
The fan must be kept free of all obstructions to ensure proper cooling.
Contact your dealer for any required service.

Electrical Controls and Wiring
Electrical controls are difficult to check without proper instrumentation.
If there are any discrepancies in the operating cycle, contact your local dealer and request service.
Refrigerant Circuit
The refrigerant circuit is difficult to check for leaks without the proper equipment. If inadequate cooling is suspected, contact your local dealer for service.

WARNING
EXPLOSION AND ENVIRONMENTAL HAZARD
Failure to follow this warning could result in personal injury, death or property damage.
System under pressure. Relieve pressure and recover all refrigerant before system repair or final unit disposal. Use all service ports and open all flow- control devices, including solenoid valves.

Unit Panels
After performing any maintenance or service on the unit, be sure all panels are fastened securely in place to prevent rain from entering unit cabinet and to prevent disruption of the correct unit airflow pattern.
Combustion Area and Vent System
For proper and safe operation, the unit needs air for combustion and ventilation. The air openings, on the unit, the air openings to the area in which the unit is installed, and the spacing around the unit must not be blocked or obstructed.
The combustion air inlet area and vent hood should be inspected visually before each heating season. The normal accumulation of dirt, soot, rust, and scale can result in loss of efficiency and improper performance if allowed to build up. This inspection should be done by a trained service person.

WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death and/or property damage.
If your unit makes an especially loud noise when the main burners are ignited, shut down the heating section and call your dealer.
CAUTION
BURN HAZARD
Failure to follow this caution may result in personal injury.
Components in heating section may be hot after unit has been started up. When observing flame, be careful not to get close to or touch heating components.

Warranty Certificate
Your unit has a limited warranty. Be sure to read the warranty carefully to determine the coverage for your unit. Before you call for service……check for several easily-solved problems.
If insufficient heating or cooling is suspected:
( ) Check for sufficient airflow. Check the air filter for dirt. Check for blocked return-air or supply-air grilles. Be sure they are open and unobstructed. If these checks do not reveal the cause, call your servicing dealer.
If your unit is not operating at all, check the following list for easy solutions:
( ) Check to be sure that your thermostat temperature selector is set below the indoor temperature during the cooling season or above the indoor temperature during heating season. Be sure the SYSTEM switch or MODE control is in the COOL or HEAT position and not in the OFF position.
( ) If your unit still fails to operate, call your servicing dealer for troubleshooting and repairs. Specify the model and serial numbers of your unit. (Record them in this manual in the space provided.) If the dealer knows exactly which unit you have, he may be able to offer suggestions over the phone, or save valuable time through knowledgeable preparation for the service call.
In Case of Trouble
If you perform the steps above and unit performance is still unsatisfactory, shut off the unit and call your dealer.

Table 2 – Maintenance Checklist

Monthly maintenance items and outdoor unit rinsing may be performed by the consumer. All other maintenance items and all service work must be performed by a qualified service technician. Read all Warning labels.

Inspect, clean, or replace air filter if filter is located indoors in return air grill.| X|
Clear away debris and vegetation near unit.| X|
Dealer specific:| |
Inspect cabinet and basepan for damage. Replace panels, gaskets, and other components that are damaged or severely rusted. Make sure precipitation has not entered indoor section of unit.| | X
Inspect electrical disconnect for proper function. Repair or replace as necessary.| | X
Inspect electrical wiring and connections. Tighten loose connections. Inspect and perform functional test of equipment as needed to ensure proper function. Repair or replace damaged or overheated components and wiring.| | X
Inspect temperature and pressure safety controls for damage| | X
Inspect and clean if necessary, combustion air openings and vent hood| | X
Check combustion byproducts with calibrated analyzer| | X
Check gas piping and shutoff valve for leaks.| | X
Check refrigerant system subcooling and/or superheat (system dependent).| | X
Inspect inside of unit. Clean if debris is present.| | X
Inspect condenser coil. Clean if dust, dirt, or debris is present. Rinse unit with fresh water (see Note 2).| | X
Inspect condenser motor and fan for damage. Make sure fan spins freely.| | X
Inspect and clean blower assembly (includes blower housing, wheel, and motor).| | X
Inspect evaporator coil. Clean if dust, dirt, or debris is present (see Note 2).| | X
Clean condensate pan and drain lines (more frequent maintenance may be required in humid climates – consult your local HVAC dealer).| | X
Inspect airflow system (ductwork). Check for leaks and repair as needed.| | X

Notes:

1. The above list may not include all maintenance items. Inspection intervals may vary depending on climate and operating hours. Consult your HVAC dealer about a service contract for seasonal inspections.
2. Do not use harsh chemicals or high pressure water on coils.

Edition Date: 02/23
Catalog No: OM48VG-ULN-02
Replaces: NEW
© 2023 Carrier. All rights res
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

References

• Kidde Fire Safety Products and Education | Kidde

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