York Single Package Air Conditioner ZXGA7E2A3AA1A111A2

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?

Ensure ZX units are properly phased at the factory

Is the blower rotating in the correct direction at start-up?

Is the electrical connection to the unit correctly phased?

Change the phasing of the Field Line Connection if necessary

High-Leg Delta Power Supply Precautions

Ensure high-leg conductor is not attached to X13 or ECM motors

Measure voltage of A or L1 phase to ground

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")?

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

Adjust blower speed to specific static and CFM requirements

Adjust belt tension to specific static and CFM requirements

Tighten blower pulley set screws

Tighten motor sheave set screws

Re-check set screws after 10-12 hours run time