Precise Pressure Regulation: Features an internal regulator adjusted to factory standards for safe and efficient fuel combustion

Note that this updated model utilizes brazed stub tube connections (7/8” suction and 1/2” discharge) rather than the older rotolock style

the Nordyne 661055R is frequently utilized in natural gas applications or specialized high-altitude conversion kits where a #55 drill size is specified for derating

cycling the thermostat or main power supply will reset the internal logic once the pressure fault has cleared

Rheem-Ruud 42-100491-54 Start Relay L99H008 Precise Pressure Regulation: Features anStart Relay