48GS,GX Combination Gas Heating/ Electric Cooling Units
A Guide To Operating and Maintaining Your
Gas Heating/Electric Cooling Unit
NOTE TO INSTALLER
This manual should be left with the equipment owner.
FOR YOUR SAFETY
Do not store or use gasoline or other ¯ammable vapors and liquids in the vicinity of this or any other appliance.
Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information, consult a quali®ed installer, service agency, or the gas supplier.
FOR YOUR SAFETY
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.
·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 ®re department.
Before performing recommended maintenance, be sure gas supply and main power switch to unit are turned off. Electrical shock could cause personal injury.
Model 48GS with Standard Wire Grille |
Model 48GX with Optional Louvered Grille |
Manufacturer reserves the right to discontinue, or change at any time, speci®cations or designs without notice and without incurring obligations.
Book |
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4 |
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PC 111 |
Catalog No. 534-742 |
Printed in U.S.A. |
Form 48GS,GX-1SO |
Pg 1 |
3-99 |
Replaces: 48GS-1SO |
Tab |
1a |
6a |
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Your combination heating/cooling unit is equipped with an automatic direct spark ignition and power combustion blower.
Do not attempt to light by hand; personal injury may result.
TO LIGHT UNIT
1.Do not turn off the electrical power to unit without ®rst turning off the gas supply.
2.Before attempting to start the gas heating section, familiarize yourself with all the procedures that must be followed.
If you do not follow these instructions exactly, a ®re or explosion may result, causing property damage, injury, or loss of life.
Refer to Fig. 1. See Fig. 2 for location of gas valve. Refer to Fig. 3 while proceeding with the following steps.
Step 1 Ð Set the temperature selector on room thermostat to the lowest temperature setting and set system switch to HEAT.
Step 2 Ð Close the external manual shutoff valve.
Step 3 Ð Turn off the electrical supply to the unit.
Step 4 Ð Remove the front access panel with a 5¤16-in. nut driver.
Step 5 Ð Move the selector switch on the internal gas valve to the OFF position and wait 5 minutes.
Step 6 Ð Move the selector switch on the internal gas valve to the ON position.
Step 7 Ð Replace the front access panel.
Step 8 Ð Turn on the electrical supply to unit.
Step 9 Ð Open the external manual shutoff valve.
Step 10 Ð Set the temperature selector on room thermostat slightly above room temperature to start unit. The induceddraft combustion-air fan will start. Main gas valve will open and main burners should ignite within 5 seconds. If the burner does not light within 5 seconds, the ignition module will go into a Retry mode after a period of approximately 22 seconds (following the 5-second ignition period).
If the burners do not light within 15 minutes of the initial call for heat, there is a lockout.
Step 11 Ð Set the temperature selector on room thermostat to desired setting.
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 ¯ame. 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.
Failure to follow these requirements could result in serious personal injury.
FRONT
ACCESS
PANEL
Fig. 1 Ð Gas Heating/Electric Cooling Unit
(Unit 48GS Shown)
TO SHUT UNIT OFF
Do not turn off the electrical power to unit without ®rst turning off the gas supply.
Failure to follow these procedures can result in serious ®re or personal injury.
NOTE: If unit is being shut down because the heating season has ended, make sure to turn on power to cooling system.
If 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 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 quali®ed 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. 4 while proceeding with the following steps.
Step 1 Ð Set the temperature selector on room thermostat to lowest temperature setting and set system switch to OFF.
Step 2 Ð Close the external manual shutoff valve.
Step 3 Ð Turn off the electrical power supply to the unit.
Step 4 Ð Remove the front access panel.
Step 5 Ð Move the selector switch on the internal gas valve to the OFF position.
Step 6 Ð Replace the burner access panel.
Step 7 Ð Restore electrical power to the unit and set system switch to COOL to ensure operation of the cooling system during the cooling season.
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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 ¯ammable liquids and vapors.
To assure proper functioning of the unit, ¯ow of combustion and ventilating air must not be obstructed from reaching the unit. Clearance of at least 30 in. is required on all sides except the duct side.
MAINTENANCE AND CARE FOR THE
EQUIPMENT OWNER
Before proceeding with those things you might want to maintain yourself, please carefully consider the following:
1.TURN OFF GAS SUPPLY AND ELECTRICAL POWER TO YOUR UNIT BEFORE SERVICING OR PERFORMING MAINTENANCE.
2.Do not turn off electrical power to this unit without ®rst turning off the gas supply.
3.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.
Air Filters Ð Air ®lter(s) should be checked at least every 3 or 4 weeks and changed or cleaned whenever it becomes dirty. Dirty ®lters produce excessive stress on the blower motor and can cause the motor to overheat and shut down. Table 1 indicates the correct ®lter size for your unit. Refer to Fig. 5 to access the ®lter(s).
To replace or inspect ®lter(s) (or accessory ®lter rack when supplied):
1.Remove the ®lter access panel using a 5¤16-in. nut driver.
2.Remove the ®lter(s) by pulling the ®lter(s) out of the unit. If the ®lter(s) is dirty, clean or replace with new one.
When installing the new ®lter(s), note the direction of the air¯ow arrows on the ®lter frame.
If you have difficulty in locating your air ®lter(s), or if you have questions concerning proper ®lter maintenance, contact your dealer for instructions. When replacing ®lters, always use the same size and type of ®lter that was supplied originally by the installer.
Table 1 Ð Indoor-Air Filter Data*
UNIT SIZE |
FILTER SIZE |
48GS018-030 |
20x20 |
48GS036-042 |
20x24 |
48GS048-060 |
24x30 |
48GX024-030 |
20x20 |
48GX036 |
20x24 |
48GX042-060 |
24x30 |
*For ®lter grille installations only.
Never operate your unit without ®lters in place. Failure to heed this warning may result in damage to the blower motor and/or compressor. An accumulation of dust and lint on internal parts of your unit can cause loss of ef- ®ciency and, in some cases, ®re.
Heat Exchanger Ð To ensure dependable and efficient heating operation, the heat exchanger should be checked by a quali®ed 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. Checking and/or cleaning the heat exchanger involves removing the gas controls assembly and the ¯ue collector box cover and, when completed, reinstalling the gas controls assembly for proper operation. Also, the ¯ue collector box cover must be replaced correctly so that a proper seal is maintained. Contact your dealer for the required periodic maintenance.
Fans and Fan Motor Ð Periodically check the condition of fan wheels and housings and fan-motor shaft bearings. No lubrication of condenseror evaporator-fan bearings or motors is required or recommended.
Evaporator and Condenser Coils Ð Cleaning of the coils should only be done by quali®ed service personnel. Contact your dealer for the required annual maintenance.
Condensate Drain Ð 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 Ð All compressors are factory-shipped with a normal charge of the correct type refrigeration grade oil in them and should rarely require additional oil. The service person must be certain the proper oil level is maintained in the compressor when it is installed and running.
Condenser Fan
Do not poke sticks, screwdrivers, or any other object into revolving fan blades. Severe bodily injury may result.
The fan must be kept free of all obstructions to ensure proper cooling. Contact your dealer for any required service.
Fig. 2 Ð Gas Heating/Electric Cooling Unit
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STEP 1 |
STEP 2 |
STEP 3 |
STEP 4 |
STEP 5 |
STEP 6 |
STEP 7 |
STEP 8 |
STEP 9 |
STEP 10 |
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Fig. 3 Ð To Light Unit
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