Bryant 581A operation manual II. Lubrication, III. Evaporator FAN Service and Replacement

F. Flue Gas Passageways

The flue collector box and heat exchanger cells may be inspected by removing heat section access panel (Fig. 4), flue box cover, and main burner assembly (Fig. 30). Refer to Main Burners section on page 41 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. 31.

G. Combustion-Air Blower

Clean periodically to assure proper airflow and heating effi- ciency. Inspect blower wheel every fall and periodically dur- ing heating season. For the first heating season, inspect blower wheel bi-monthly to determine proper cleaning frequency.

To inspect blower wheel, remove heat section panel. Using an inspection mirror and flashlight, look into the flue exhaust duct to inspect the wheel. If cleaning is required, remove motor and wheel assembly by removing the screws holding the flue box cover to the flue box. See Fig. 30. 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.

II. LUBRICATION

A. Compressors

Each compressor is charged with the correct amount of oil at the factory. Conventional white oil (Zerol 150T or Sontex SA32) is used. White oil is compatible with 3GS oil, and 3GS oil may be used if the addition of oil is required. See compres- sor nameplate for original oil charge. Oil recharge amount is shown in Table 1. When a compressor is exchanged in the field it is possible that a major portion of the oil from the replaced compressor may still be in the system. While this will not affect the reliability of the replacement compressor, the extra oil will add rotor drag and increase power usage. To remove this excess oil, an access valve may be added to the lower portion of the suction line at the inlet of the compres- sor. The compressor should then be run for 10 minutes, shut down and the access valve opened until no oil flows. This should be repeated twice to make sure the proper oil level has been achieved.

B. Fan Shaft Bearings

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.

C. Condenser and Evaporator-Fan Motor Bearings

The condenser and evaporator-fan motors have permanently sealed bearings, so no field lubrication is necessary.

III. EVAPORATOR FAN SERVICE AND REPLACEMENT

The 581A units feature a slide-out fan deck for easy servic- ing of the indoor-fan motor, pulleys, belt, and bearings. To service components in this section, perform the following procedure:

HEAT EXCHANGER SECTION

IGC BOARD (HIDDEN)

COMBUSTION

FAN HOUSING

INDUCED

DRAFT

MOTOR

MAIN GAS

VALVE

MAIN BURNER

SECTION

1.	Turn off unit power.
2.	Open the fan section access panel.
3.	Remove three no. 10 screws at front of slide-out fan
	deck. Save screws. See Fig. 32.
4.	Disconnect the electrical plugs and wires connected
	to the slide-out fan deck (evaporator fan plug, supply
	air thermistor, and fan status switch if installed).
	Wires may be damaged if not disconnected.
5.	Fan deck can now be slid out to access serviceable

LEGEND

IGC — Integrated Gas Controller

Fig. 30 — Typical Gas Heating Section

CERAMIC

BAFFLE

CLIP

NOTE: One baffle and clip will be in each upper tube of the heat exchanger.

Fig. 31 — Removing Heat Exchanger Ceramic Baffles

and Clips

components.

CAUTION: DO NOT SLIDE FAN DECK OUT PAST THE STOP BRACKET. If further access is required, the fan deck must be supported. Make sure plugs and wiring are not pinched between fan housing and unit center post. Damage to unit may result.

6.To replace fan deck to operating position, slide fan deck back into the unit. Secure with the three no. 10 screws removed in Step 3.

7.Re-attach electrical plugs and wires.

8.Close fan section access door.

9.Restore power to unit.

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