York Rooftop Unit Y12EC04C1LABAB

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?

Type of filter maintenance performed

Replacement filter of the same dimensional size?

Sign off on the monthly filters maintenance

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.

MOTORS: Outdoor fan motors are permanently lubricated and require no maintenance. Lubrication, if desired, is to be performed by a qualified service agency. Ventor motors are factory lubricated for an estimated 10-year life.

All wires labeled prior to disconnection?

Verified proper operation after servicing?

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 the color of the moisture indicator

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.

Enter the measured CFM based on Figures 58 and 59

Enter the PD of standard sheave

Use the equation (Specified CFM/Measured CFM) X PD of standard sheave = PD of new sheave to calculate the PD of new sheave.

Enter the PD of new sheave calculated from the equation

Use the 30 ton Table 35 to select a Browning 2B5V74 which will increase the speed of the unit's drive and its supply air CFM 108.7%.

CAUTION: Damage can occur if the bearings are over lubricated. Use grease sparingly.

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. For normal running:

If the drive fails, switch the BYPASS/OFF/DRIVE switch to BYPASS. If there is a call for the fan, it will go to full speed. If there are VAV boxes, connect them to the circuit at TB1/6 and they will be driven open in bypass mode.

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.

Indoor Blower Bearing Lubrication Schedule

Sign off on the blower bearing lubrication