York Single Package Air Conditioner ZJ078E24R4B5EAA1A1

Ensure no open flames are present in the area.

Use only approved pipe dope for assembling pipes.

Ensure the main shut-off valve is open to admit normal gas pressure.

Prepare a commercially available soap solution for leak detection.

Apply the soap solution to all joints and connections.

Check each joint for bubbles indicating a leak.

Loosen six nuts (top and bottom) A

Ensure nuts (C) are not loosened

Use belt tension checker to apply perpendicular force to one belt at midpoint of the span

Enter the deflection distance obtained

Use a straight edge from sheave to sheave as reference line to determine deflection distance from normal position

Record the recommended deflection force for the belt section

Was the belt tension checked at least two times during the first 24 hours of operation?

Verify that the ZJ078-150 unit is properly phased at the factory.

Is the electrical connection to the unit correctly phased?

Is the compressor rotating in the correct direction?

Check for signs of misphasing in the scroll compressor

Is the supply air blower rotating in the correct direction?

Is the line voltage at the unit point of power connection correctly phased?

Check that all filters are installed ahead of the evaporator coil

Inspect filters for dirt and debris

Clean or replace dirty filters with the same size and type

Ensure the unit is not operated without properly installed filters

Verify panel latches are properly positioned to maintain an airtight seal

Connect a manometer to the outlet pressure port on the gas valve

Remove plastic cap covering HI and LO pressure adjustment screws

Second Stage Pressure Adjustment

Set thermostat to call for second stage heat and start furnace

Adjust second stage (HI) manifold pressure using a screwdriver

Is the second stage manifold pressure within 3.5 IWG ± 0.3?