York Single Package Air Conditioner ZR090N15A2AAA50124A

Gas Connection and Pressure Check

Open the main shut-off valve to admit normal gas pressure to the mains.

Check all joints for leaks using soap solution or other suitable material. NEVER USE A FLAME.

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

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

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 disconnected from the gas supply piping system?

Is the gas valve replaced if subjected to pressure greater than 1/2 PSIG?

Is the furnace isolated from the gas supply piping system?

Check that all filters are in place

Inspect filters for dirt and debris

Do the filters need replacement?

Replace filters with the same size and type

Ensure filters are installed ahead of evaporator coil

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

Remove cover screws covering HI and LO pressure adjustment screws

Set thermostat to call for second stage heat and start furnace

Enter the current manifold pressure for second stage (100% input)