York Single Package Air Conditioner ZR102N10A2AAA50124A

Close main manual shut-off valve

Open the union fitting upstream of the unit gas valve

Remove screws holding manifold to supports

Disconnect wiring to the gas valve

Remove manifold & gas valve assembly

Check that all filters are in place

Ensure filters are installed ahead of evaporator coil

Verify filters are of the correct size and type

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?

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)

Review installation for errors, leaks, or undesirable system effects

Check blower speed changes for substantial changes in static pressure and BHP

Ensure only qualified personnel make blower speed changes

Calculate the new datum diameter (DD)

Adjust the variable pitch motor sheave to the new DD

Verify the new blower speed adheres to fan laws