York Single Package Air Conditioner ZF150N24R2A1BAA1A3

Use special pipe dope for assembly

Clean piping of dirt and scale by hammering on the outside of the pipe

Blow out loose particles from the pipe

Ensure all gas lines external to the unit have been purged of air

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?

Measure deflection distance using belt tension checker

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

Record the deflection force applied

Number of times belt tension checked in first 24 hours

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

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

Ensure compliance with installation instructions and applicable codes

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

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

Isolate furnace from gas supply piping system by closing manual shut-off valve for pressure testing at or below 1/2 PSIG