York Single Package Air Conditioner ZXG12E2A3AA1A111A2

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?

Loosen the three nuts (A and B on side and C on back) of motor mount slide plate.

Adjust tension by placing a flat head screwdriver into the belt tightening slots and applying pressure against the motor mounting plate.

Tighten the three loosened nuts (A, B and C).

Determine the deflection distance from normal position using a straight edge from sheave to sheave as reference line.

Use belt tension checker to apply a perpendicular force to the belt at the midpoint of the span and measure deflection distance.

Is the deflection distance 4mm (5/32")?

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 disconnected from the gas supply piping system?

Is the pressure testing conducted at pressures in excess of 1/2 PSIG?

Ensure the furnace is isolated from the gas supply piping system during pressure testing at pressures equal to or less than 1/2 PSIG

Close main manual shut-off valve

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

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

Disconnect wiring to the gas valve

Remove the manifold & gas valve assembly

Inspect orifices for wear or damage

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

Remove cover screws covering HI and LO pressure adjustment screws

Set thermostat to call for second stage heat and start furnace

Enter the manifold pressure for the second stage

Is the second stage manifold pressure within the specified range?