Carrier 48ES---A, 48VL-A manual Operating Your Unit, Maintenance and Service

!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.

Flue Hood

Burners Gas Valve

A09043

Fig. 4 - Gas Heating/Electric Cooling Unit with Access Panel

Removed

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. 6 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. 3.)

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. 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 ON the electrical power supply to the unit.

4.Set system switch to COOL.

5.Set the temperature selector on room thermostat slightly be- low the room temperature to start unit.

To shut off unit electric cooling:

Refer to Fig. 8 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.

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