York Single Package Air Conditioner ZJ150S24R4B5EAA1A1

Clean all piping of dirt and scale by hammering on the outside of the pipe.

Blow out loose particles from the piping.

Have all gas lines external to the unit been purged of air?

Inspect the unit for possible damage during transit

Is there any evident damage on the unit?

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

Request inspection by the carrier’s agent in writing

Ensure installation complies with all applicable codes

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.

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 similar?

Is the scroll compressor producing a high noise level?

Ensure main manual shut-off valve is closed and all power to the unit is shut off

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

Remove the screws holding each end of the manifold to the manifold supports

Disconnect wiring to the gas valves and spark igniters

Remove the manifold & gas valve assembly

Inspect and/or replace orifices

Remove the heat shield on top of the manifold supports to access burners

Ensure burners are level and seated at the rear of the gas orifice