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Difference Setpoint Control 157 - Variable Speed

The Difference Setpoint Control 157 is designed to use a variable speed pump to transfer heat from an intermittent heat source to a storage tank. It can be used in many different solar applications, including closed systems, drainback, or heat dump installations. Two sensors are used to measure the temperature at the source and at the storage location, and begin heat transfer when there is a positive difference between them. This product uses variable speed technology to operate a permanent capacitor wet rotor circulator to vary the rate at which heat transfer occurs.

How do I purchase this product?

Contact your Local Representative for details.

Features & Specs

Features (definitions)

120 V (ac) powered pump outputs
Certified to CSA and UL standards for use in the USA and Canada
Displays and logs total amount of energy transfer in BTU or kWh
Drainback capability
External heat exchanger mode
Freeze Protection
Heat Dump operation
Heat supplement mode
Optional auxiliary sensor input to be used in heat dump and heat supplement modes
Second On/Off pump

Specifications

Control	Microprocessor control. This is not a safety (limit) control
Packaged weight	1.5 lb. (670 g)
Dimensions	4-3/4" H x 2-7/8" W x 7/8" D (120 x 74 x 22 mm)
Enclosure	White PVC plastic, NEMA type 1
Approvals	CSA C US, meets class B: ICES & FCC Part 15
Ambient conditions	Indoor use only, 32 to 104°F (0 to 40°C), RH ≤90% Non-condensing
Power supply	24 V (ac) ±10%, 50/60 Hz, 3 VA
Var. pump	120 V (ac) 2.4 A (FLA), 5 A (LRA), 1/6 hp
Pump 2	120 V (ac) 5 A, 1/6 hp
Demand	24 V (ac) 2 VA
Sensors	NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892
-Included	Universal Sensor 071 and Solar Sensor 085
-Optional	tekmar type #: 071, 078, 082, 085
Warranty	Limited 3 Year Warranty

Technical