Utica-Dunkirk Z99 Control 318973-401 It should be positioned as

It should be positioned as close to the compressor as possible

This genuine Johnson Controls component is the professional standard for technicians requiring exact specifications and reliable combustion system performance

Durable Round Profile: Rugged design withstands high ambient temperatures in condenser cabinets without performance degradation

Precise Negative Pressure Sensing: Fixed -1

Utica-Dunkirk Z99 Control 318973-401 It should be positioned asThe Utica Dunkirk Z99 Control (Main Control Relay Board) serves as the primary logic and distribution hub for specific gas fired boiler configurations. This OEM replacement part is engineered to manage critical sequencing, including circulator pump delays, inducer motor activation, and safety limit monitoring. For technicians troubleshooting intermittent ignition cycles or failure in the boiler control circuit, this board provides the necessary 24VAC