Harman Stove Company PB 105 manual Pellet Boiler Outdoor Air Reset Operation

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Pellet Boiler Outdoor Air Reset Operation

When the outdoor sensor is installed, at 20° F. or below OAT (Outdoor Air Temperature), the boiler will operate at the temperature set on the Maximum Temperature knob. The boiler water temperature will decrease by 1 degree for every 1 degree in temperature rise of the Outside Air.

Example 1		OAT	Water Temp	Degree Change
Max set at 185o		65o	140o	-45°
Min set at 140o		60o	145o	-40°
		55o	150o	-35°
		50o	155o	-30°
		45o	160o	-25o
		40o	165o	-20o
		35o	170o	-15o
		30o	175o	-10o
		25o	180o	-5o
		20o	185o	0o
		15o	185o	0o
		10o	185o	0o
		5o	185o	0°
		0o	185o
	Example 2	OAT	Water Temp	Degree Change
	Max set at 180o	65o	150o	*
	Min set at 150o	60o	150o	*
		55o	150o	*
		50o	150o	-30o
		45o	155o	-25o
		40o	160o	-20o
		35o	165o	-15o
		30o	170o	-10o
		25o	175o	-5o
		20o	180o	0o
		15o	180o	0o
		10o	180o	0o
		5o	180o	0o
		0o	180o	0o

*No change in boiler temperature after reaching minimum setpoint temperature.

Operation