York Single Package Air Conditioner ZT049S00A2A1AAA1A1

Verify that the unit is properly phased at the factory.

Is the blower rotating in the correct direction?

Is the compressor rotating in the correct direction?

Measure the amperage of the scroll compressor.

Are the suction and discharge pressures normal?

Is the noise level of the scroll compressor normal?

Inspect the unit for visible damage during transit

Note the extent of any damage on the carrier’s freight bill

Request inspection by the carrier’s agent in writing

Is the furnace and its individual shut-off valve disconnected from the gas supply piping system?

Is the furnace isolated from the gas supply piping system by closing its individual manual shut-off valve?

Verify the type and size of filters installed

Check that filters are installed ahead of evaporator coil

Inspect filters for dirt and debris

Do the filters need replacement?

Replace filters with the same size and type if necessary

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

Remove cover screws covering HI and LO pressure adjustment screws

Second Stage Pressure Adjustment

Set thermostat to call for second stage heat and start furnace

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

Loosen six nuts (top and bottom) A

Ensure nuts (C) are not loosened

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

Enter the deflection distance obtained (in mm)

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

Record the recommended deflection force for the belt section

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