48/50PG and PM
Condensate Drain Pan (48/50PM16−28 Units)
Check and clean each year at the start of the cooling season. An access panel is located above the condensate connection to allow easy clean out of the condensate pan. The first time the panel is removed, the insulation behind the access panel will need to be cut away. Carefully cut the insulation with a knife or blade on three sides so the insulation can be folded out of the way during cleaning. Be careful not to damage components behind the insulation while cutting. Once cleaning is completed, fold the insulation back into place and secure the access panel in the original position.
Filters
Clean or replace at start of each heating and cooling season, or more often if operating conditions require. Refer to unit Installation Instructions for type and size.
Outdoor−Air Inlet Screens
Clean screens with steam or hot water and a mild detergent. Do not use throwaway filters in place of screens. See unit installation instructions for quantity and size.
Main Burner (48PG and PM)
At the beginning of each heating season, inspect for deterioration or blockage due to corrosion or other causes. Observe the main burner flames. Refer to Main Burners section.
Flue Gas Passageways (48PG and PM)
The flue collector box and heat exchanger cells may be inspected by opening heat section access door (Fig. 5), flue box cover, and main burner assembly. (See Fig. 50.) Refer to Main Burners section for burner removal sequence. If cleaning is required, clean tubes with a wire brush. Use Caution with ceramic heat exchanger baffles. When installing retaining clip, be sure the center leg of the clip extends inward toward baffle. (See Fig. 49.)
CERAMIC
BAFFLE
CLIP
NOTE: One baffle and clip will be in each upper tube of the heat exchanger.
C07260
Fig. 49 − Removing Heat Exchanger Ceramic
Baffles and Clips
Combustion−Air Blower
Clean periodically to assure proper airflow and heating efficiency. Inspect blower wheel every fall and periodically during heating season. For the first heating season, inspect blower wheel
To inspect blower wheel, open heat section door. Using a flashlight, look into the flue exhaust duct to inspect. If cleaning is required, remove motor and wheel assembly by removing the screws holding the flue box cover to the flue box. (See Fig. 50 or 51.) Remove the screws holding the inducer housing to the inlet plate. The wheel can then be removed from the motor shaft and cleaned with a detergent or solvent. Replace the wheel onto the motor shaft in the correct position and reassemble the flue cover onto the flue box.
Lubrication
Compressors
Each compressor is charged with the correct amount of oil at the factory.
!CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in damage to unit components.
The compressor is in a Puron refrigerant system and uses a polyolester (POE) oil. This oil is extremely hygroscopic, meaning it absorbs water readily. POE oils can absorb 15 times as much water as other oils designed for HCFC and CFC refrigerants. Avoid exposure of the oil to the atmosphere.
Polyolester (POE) compressor lubricants are known to cause long term damage to some synthetic roofing materials. Exposure, even if immediately cleaned up, may cause roofing materials to become brittle (leading to cracking) within a year. When performing any service which may risk exposure of compressor oil to the roof, take appropriate precautions to protect roofing. Procedures which risk oil leakage include compressor replacement, repairing refrigerant leaks, and replacing refrigerant components. To prepare rooftop:
1.Cover extended roof work area with an impermeable plastic dropcloth or tarp. Make sure a 10 x 10 ft area around the work area is covered.
2.Cover area in front of the unit service panel with a terry cloth shop towel to absorb lubricant spills and prevent
3.Place terry cloth shop towel inside the unit directly under components to be serviced to prevent spills through the bottom of the unit.
4.Perform the required service.
5.Remove and dispose of any oil contaminated material per local codes.
Indoor Fan Shaft Bearings (Sizes 03−14)
The indoor fan has permanently sealed bearings. No field lubrication is necessary.
Indoor Fan Shaft Bearings (Sizes 16−28)
Lubricate bearings at least every 6 months with suitable bearing grease. Typical lubricants are given below:
MANUFACTURER | LUBRICANT |
Texaco | Regal AFB‐2* |
Mobil | Mobilplex EP No. 1 |
Sunoco | Prestige 42 |
Texaco | Multifak 2 |
* Preferred lubricant because it contains rust and oxidation inhibitors.
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