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while the SPST relay provides isolated control rated for 5A at 250VAC
Most failures in these units stem from bearing wear due to environmental debris or electrical issues like phase loss
The 5-second Trial for Ignition is the window the control allows for the flame to be sensed after the gas valve opens
this valve manages media temperatures up to 210°F with a consistent 5
You must purchase or provide a compatible Gold Ring coil separately
Carrier HH18HA170 Limit Switch 319825-402 while the SPST relay providesThe Carrier HH18HA170 Limit Switch is a critical safety component designed for precise thermal monitoring in residential and commercial HVAC furnaces. This genuine OEM replacement part features an L170 40F specification, meaning it is calibrated to open the electrical circuit when the internal temperature reaches 170F and automatically reset once the temperature drops by 40F (resetting at 130F). Engineered for high limit protection, this switch
