York Rooftop Unit Y12FC05C1LABAB

The indoor blower motor features ball bearings that do not require periodic lubrication

Periodic lubrication of the motor bearings can extend the life but is optional

Damage can occur if the bearings are over lubricated

To go to bypass mode, the bypass VFD 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

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.

FILTERS: Inspect once a month. Replace disposable or clean permanent type as necessary. The dimensional size of the replacement filter must be the same as the replaced filter. Refer to Table 9;

All wires labeled prior to disconnection?

Disposable filters replaced or permanent type cleaned as necessary?

Replacement filter of the same dimensional size as the replaced filter?

Sign off on the monthly filters maintenance

Check if the system is fully factory charged with R-22.

Verify if the correct charge appears on the unit nameplate.

Check the Thermal Expansion Valves.

Check if the superheat on each valve is adjustable.

Check the moisture/liquid sight glass.

Check if a clear flow of liquid indicates the unit is properly charged.

Check if any bubbles indicate the system is undercharged or noncondensables may exist.

Check if a change in color of the moisture indicator shows the approximate moisture content of the system in parts per million.

Check if each system is equipped with a filter drier.

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.

Power disconnected from the unit?

If desired, every three years remove both pipe plugs at each end shell and clean out any hardened grease or foreign matter.

Both pipe plugs removed and cleaned?

Replace one plug on each end with a clean grease fitting.

One plug on each end replaced with a clean grease fitting?

Using a low pressure grease gun, pump grease (Chevron SRI-2 or equivalent) into the bearing cavity until new grease shows at the open port. Do not over-lubricate.

Grease pumped into the bearing cavity until new grease shows at the open port?

CAUTION: This procedure requires trained personnel with PPE!

Is the unit equipped with power exhaust fans or a return air fan?

If yes, check belt tension and adjust as necessary

Loosen the four bolts holding the motor base to the channels

Adjust the belt by turning nuts 'A'

Enter the deflection distance from the normal position

Use the recommended deflection force per the Belt Adjustment Table

Tension new belts at the maximum deflection force recommended

Check the belt tension at least two times during the first 24 hours of operation