York Single Package Air Conditioner ZF120N24B7A1BAA1A1

Loosen six nuts (top and bottom) A

Ensure nuts (C) are not loosened

Use belt tension checker to apply perpendicular force and obtain 4mm deflection distance

Record the deflection force applied

Re-tighten nuts (A) after adjustment

Enter the number of times belt tension was checked in the first 24 hours

Ensure no open flames are present in the area.

Use only approved pipe dope for assembling pipes.

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

Check all joints for leaks using a soap solution or other suitable material.

Were any leaks detected during the inspection?

Close the main shut-off valve if leaks were detected.

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 adjustment screw to set manifold pressure

Is the second stage manifold pressure within 3.5 IWG ± 0.3?

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

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

Check for proper compressor rotation

Verify blower rotation direction

Inspect electrical connection for misphasing

Change the phasing of the Field Line Connection if necessary

Check if the scroll compressor is drawing low amperage

Check for similar suction and discharge pressures