York Gas Furnace: PM9 Modulating PSC

Re: Control Board Replacement

The PM9 furnace is a modulating gas furnace with a standard, PSC blower motor.

• The original control board had a differential pressure transducer built into the bottom of the board.
• The new control board utilizes an external pressure transducer and uses a different modulating signal for the gas valve.

If the original control board must be replaced, a control board kit is required.

The new kit consists of the following:

• New Control Board
• New Gas Valve
• New Transducer
• Wiring Harnesses
• Wiring Diagram
• Configuration Plugs
  • The correct plug must be installed to match the furnace model#.