York Single Package Air Conditioner ZJ078C24R4B5EAA1A1

Inspect unit for possible damage during transit

Note extent of damage on carrier’s freight bill if damage is evident

Request inspection by the carrier’s agent in writing

Compliance with installation instructions and codes

Ensure installation complies with enclosed instructions

Verify compliance with local, state, and national codes

Gas supply pressure testing precautions

Disconnect furnace and shut-off valve from gas supply piping system for pressures above 1/2 PSIG

Replace gas valve if subjected to pressure greater than 1/2 PSIG

Ensure no open flames are present in the area.

Use only approved pipe dope for assembling pipes.

Ensure the main shut-off valve is open to admit normal gas pressure.

Prepare a commercially available soap solution for leak detection.

Apply the soap solution to all joints and connections.

Check each joint for bubbles indicating a leak.

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

Check for proper compressor rotation

Inspect for low amperage, similar suction and discharge pressures, or high noise level in scroll compressors

Electrical Connection Verification

Verify electrical connection for correct phasing

Change the phasing of the Field Line Connection if necessary

Check for proper supply air blower rotation

Verify if the blower is rotating backwards

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

Remove plastic cap covering HI and LO pressure adjustment screws

Second Stage Pressure Adjustment

Set thermostat to call for second stage heat and start furnace

Adjust second stage (100% input) pressure using the HI adjustment screw

Enter the manifold pressure for second stage