With the UI control set to HEAT, your unit will normally operate the electric heat pump until the room temperature is raised to the level you have selected. If the demand for heat cannot be met by the elec- tric heat pump, your UI control will automatically switch to gas heat until the call for heat is satisfied.
On colder days, your system may automatically switch to gas heat as the primary heating source to maximize the overall system effi- ciency and maintain your comfort level.
MAINTENANCE AND SERVICE
This section discusses maintenance that should be performed on your system. Most maintenance should be performed by your deal- er. 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.
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. Clearance of at least 36 in. is required on sides ex- cept the power entry side (42 in. clearance) and the duct side (12 in. minimum clearance).
Maintenance and Care for the Equipment Owner
Before proceeding with those things you might want to maintain yourself, please carefully consider the following:
!WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury, death or property damage.
BEFORE SERVICING OR PERFORMING MAINTE- NANCE ON YOUR UNIT:
1.TURN OFF GAS SUPPLY TO YOUR UNIT.
2.TURN OFF ELECTRICAL POWER TO YOUR UNIT.
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in death, personal injury and/or property damage.
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
The air filter(s) should be checked every 3 or 4 weeks and changed or cleaned whenever it becomes dirty. Dirty filters produce exces- sive 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 ap- plications, 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 re- placed.
The other typical application is an accessory filter rack installed in- side the unit itself. The following information is given to assist in changing filters used in these internal filter racks.
Table 1 indicates the correct filter size for your unit. Refer to Fig. 2 to access filters installed in the accessory filter rack.
Table 1—Indoor Air Filter Data
Unit Size | Filter Size |
20x24x1 | |
677B036 | 24x30x1 |
24x36x1 |
To replace or inspect filters in accessory filter rack (See Fig. 2):
1.Remove the filter access panel using a
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 ar- rows on the filter frame.
If you have difficulty locating your air filter(s) or have questions concerning proper filter maintenance, contact your dealer for in- structions. When replacing filters, always use the same size and type of filter that was supplied originally by the installer.
!WARNING
FIRE AND UNIT OPERATION HAZARD
Failure to follow this warning could result in personal injury, death or 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.
ACCESS PANEL
FILTER ACCESS
PANEL*
*For accessory filter rack
A06116
Fig. 2 - Accessory Filter Rack Access Panel
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.
Indoor and Outdoor Coils
Cleaning of the coils should only be done by qualified service per- sonnel. 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 deal- er.
Compressor
All compressors are factory shipped with a normal charge of the cor- rect type of refrigeration grade oil. A compressor should rarely re- quire additional oil.
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