York Single Package Air Conditioner ZF150N24R5B1BAA1A1

Check that all filters are in place and clean

Are the filters clean and in good condition?

Clean or replace filters if necessary

Ensure filters are installed ahead of evaporator coil

Is the unit operating with filters properly installed?

Ensure the use of appropriate pipe dope

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

Blow out loose particles from the pipe

Purge all gas lines external to the unit of air before initial start-up

Verify that the ZF120-150 unit is properly phased at the factory.

Is the blower rotating in the correct direction?

Is the compressor rotating in the correct direction?

Check for signs of misphasing in the scroll compressor

Is the electrical connection to the unit misphased?

Change the phasing of the Field Line Connection at the factory or field supplied disconnect to obtain proper rotation.

Inspect the unit for possible damage during transit

Is there any evident damage on the unit?

Note the extent of the damage on the carrier’s freight bill

Request inspection by the carrier’s agent in writing

Ensure installation complies with all applicable codes

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

Reverse the procedure to replace the assemblies