York Single Package Air Conditioner ZR090N10A2AAA50124A

Adjust blower speed to specific static and CFM requirements

Adjust belt tension as required

Tighten blower pulley set screws

Tighten motor sheave set screws

Have the set screws been re-checked after 10-12 hours of run time?

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.

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

Remove cover screws covering HI and LO pressure adjustment screws

Set thermostat to call for second stage heat and start furnace

Record the manifold pressure for second stage (100% input)

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

Use a straight edge from sheave to sheave as reference line to determine the deflection distance from normal position

Record the recommended deflection force for the belt section

Check the belt tension at least two times during the first 24 hours of operation

Review installation for errors, leaks, or undesirable system effects

Are there any installation errors, leaks, or undesirable system effects?

Describe the installation errors, leaks, or undesirable system effects found

Enter the measured CFM at unit start-up

Enter the existing datum diameter (DD) of the variable pitch motor sheave

Calculate the new datum diameter (DD) using the formula: (Required CFM/Measured CFM)*Existing DD

Is the new datum diameter (DD) adjusted correctly?