Difference Setpoint Control - On/Off

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 120¼F (-30 to 50¼C), < 90% RH non-condensing Power Supply: 24 V ¼10% 50/60 Hz 2 VA, 24 V (dc) ¼10% 0.04 A Relay: 240 V (ac) 10 A 1/3 hp, pilot duty 240 VA Sensors Included NTC thermistor, 10 komega @ 77¼F (25¼C ¼0.2¼C) +=3892 Two of Universal Sensor 071