York Rooftop Unit Y12DC04C1LABAB

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?

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.

Check the motor for accumulations of dust that may block the cooling slots in the motor shell.

Check for loose, damaged or misaligned drive components.

Check that all mounting bolts are tight.

List any defective parts found.

Sign off on the blower motor check.

CAUTION: Before making any blower speed changes review the installation for any installation errors, leaks or undesirable systems effects that can result in loss of air flow. Even small changes in blower speed can result in substantial changes in static pressure and BHP.

BHP or AMP draw of the blower motor will increase by the cube ratio of the blower speed. Static pressure will increase by the square ratio of the blower speed.

Tables 24 and 25 are for reference only. All blower speed changes must be made by qualified personnel with strict adherence to the fan laws.

Measured CFM based on Figures 58 and 59

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

Verify 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

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