tekmar Difference Setpoint Control 156

Difference Setpoint Control 155

Control Description The Difference Setpoint Control 156 is designed to operate an on/off pump to transfer heat from a heat source to a storage tank. The control operates based on a setpoint temperature difference (ΔT). The relay turns on when the ΔT rises above the setpoint and turns off when the ΔT falls below the setpoint less the differential. The Source Minimum and Storage Maximum settings turn off the relay when heat transfer is no longer desirable. Potential applications include using solar collectors or a wood boiler as a heat source.

Literature	—	D 156, A 156, D 001, D 070
Control	—	Microprocessor control; This is not a safety (limit) control
Packaged Weight	—	0.8 lb. (360 g)
	—	Enclosure C, White PVC plastic
Dimensions	—	4-3/4" H x 2-7/8" W x 7/8" D (120 x 74 x 22 mm)
Approvals	—	CSA certified to CSA 22.2 No 24 and UL 873
Ambient Conditions	—	Indoor use only, -20 to 120°F (-30 to 50°C), < 90% RH non-condensing
Power Supply	—	24 V ±10% 50/60 Hz 2 VA
		24 V (dc) ±10% 0.04 A
Relay	—	Relay 240 V (ac) 10 A 1/3 hp, pilot duty 240 VA
Sensors Included	—	NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892 Two of Universal Sensor 071

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Literature

Control

Packaged Weight

Dimensions

Approvals

Ambient Conditions

Power Supply

Relay

Sensors Included