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Your dealer can help you establish a standard procedure. *See base unit Installation Instructions if field-supplied or optional factory-supplied filters are used. When replacing filters, always use the same type and size originally supplied. 4 When replacing your unit filters, always use the same sizeand type of filter that was originally supplied by the installer. Units with outdoor air capability have a cleanable filter forthe outdoor air. This filter should be checked annually andcleaned as necessary. Remove by removing screws in outdoor- air filter retainer and sliding filters out of the unit. Never operate your unit without filters in place. Failure toheed this warning may result in damage to the blowermotor and/or compressor. An accumulation of dust and linton internal parts of your unit can cause loss of efficiencyand, in some cases, fire. Heat Exchanger — To ensure dependable and efficientheating operation, the heat exchanger should be checked by aqualified maintenance person before each heating season, andcleaned when necessary. This checkout should not be attempted by anyone not having the required expertise and equipmentto do the job properly. Checking and/or cleaning the heatexchanger involves removing the gas controls assembly andthe flue collector box cover and, when completed, reinstallingthe gas controls assembly for proper operation. Also, the fluecollector box cover must be replaced correctly so that a properseal is maintained. Contact your dealer for the required periodic maintenance. STEP 1 Run Status Service Test Temperature Pressures Setpoints Inputs Outputs Configuration Time Clock Operating Modes Alarms Alarm Status ENTER MODE ESCAPE STEP 2 STEP 3 LOCK-OUTTAG ON OFF MAIN STEP 4 STEP 5 STEP 6 STEP 7 Fig. 3 — To Shut Unit Off 5 SIZES 030-050 (040 SHOWN) SIZES 055-070 FILTER CONTROL BOX FLUE OUTLETS (FAR SIDE) ACCESS DOOR (BOTH SIDES) ACCESS DOOR (FAR SIDE ONLY) ACCESS DOOR (NEAR SIDE ONLY) ACCESS DOOR (FAR SIDE ONLY) POWER EXHAUST VFD (NEAR SIDE) POWER EXHAUST CONTROL BOX (FAR SIDE) ACCESS DOOR POWER EXHAUST ACCESS DOOR GAS SECTION ACCESS DOOR (FAR SIDE) ACCESS (BOTH SIDES) (BOTH SIDES) SIZES 075-105 Fig. 4 — Door Locations (48Z Series Units) 6 Fan and Belts — Periodically check the condition of fanwheels and housings and belt tension. When service is necessary, call your dealer. Evaporator-Fan Motor, Condenser-Fan Motor and Combustion-Fan Motor — Lubrication is not recommended. Bearings will not require lubrication for at least5 years of normal operation. After 5 years, motor life can beextended by having the motors serviced at an authorized motorservice shop. Fan Shaft Bearings — Charge fittings annually withShell Alvania No. 2 or equivalent grease. Evaporator and Condenser Coils — Cleaning of thecoils should only be done by qualified service personnel. Contact your dealer for the required maintenance as needed. Condensate Drain — The drain pan and condensatedrain line should be checked and cleaned at the same time the cooling coils are checked by your dealer. Compressors — All compressors are factory shippedwith a normal charge of the correct type refrigeration grade oilin them and should rarely require additional oil. The servicetechnician must be certain the proper oil level is maintained inthe 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. Cont...
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