York Single Package Cooling Unit ZD-04H00A2A1AAA1A1

Close main manual shut-off valve and shut off all electric power to the unit

Remove screws holding either end of the manifold to the burner supports

Open the union fitting in the gas supply line just upstream of the unit gas valve and downstream from the main manual shut-off valve

Remove the gas piping closure panel

Disconnect wiring to the gas valves and spark ignitors

Remove the manifold-burner gas valve assembly by lifting up and pulling back

Remove the adjustment screw cap(s) on the regulator

Enter the current manifold pressure reading

Is the manifold pressure set to the factory standard of 3.50 IWG?

Describe any deviations from the expected manifold pressure

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

Enter the deflection force applied

Is the deflection distance within the recommended range?

Is the deflection force within the recommended range?

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

Ensure installation complies with local, state, and national codes

Is the furnace disconnected from the gas supply piping system?

Check that all filters are in place and clean

Are the filters clean and in good condition?

Do the filters need replacement?

Replace filters with the same size and type

Ensure panel latches are properly positioned for an airtight seal

Is the unit operating with filters properly installed?