CAUTION: Prior to any of the following maintenance procedures, shut off all power to the unit. Failure to do so could cause personal injury.
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.
Periodic maintenance normally consists of changing or cleaning filters and (under some conditions) cleaning the main burners.
Indoor Fan Motors
CAUTION: Damage can occur if the bearings are over lubricated. Use grease sparingly.
To go to bypass mode, the bypass VFD as installed in this unit must be switched by hand on the front of the bypass enclosure in the fan cabinet of the rooftop unit. It does not automatically go to bypass mode if the drive fails.
The switches on the front of the bypass box control its run mode. For normal running:
CAUTION: If the unit is operated with the manual bypass switch in the LINE (BYPASS) position and there are VAV boxes present, the boxes must be driven to the full-open position using a customer-supplied power source to prevent over-pressuring the ductwork
WARNING! Perform all maintenance operations on the blower motor with power disconnected from the unit. Do not attempt to lubricate bearings with the unit in operation.
TABLE 59: INDOOR BLOWER BEARING LUBRICATION SCHEDULE
If desired, every three years remove both pipe plugs at each end shell and clean out any hardened grease or foreign matter
NOTE: Exercise care when cleaning the coil so that the coil fins are not damaged.
Do not permit the hot condenser air discharge to be obstructed by overhanging structures or shrubs.
TO CLEAN BURNERS
COMBUSTION AIR DISCHARGE
CLEANING FLUE PASSAGES AND HEATING ELEMENTS
With proper combustion adjustment, the heating element of a gas fired furnace will seldom need cleaning. If the element should become sooted, it can be cleaned as follows:
FIGURE 48 - TYPICAL FLUE BAFFLE
The restrictor plate must also be sealed to furnace tube sheet.
SECURE OWNERS APPROVAL
When the system is functioning properly, secure the owner’s approval. Show him the location of all disconnect switches and the room temperature sensors. Teach him how to start and stop the unit and how to adjust the temperature settings within the limitat