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156 | Difference Setpoint Control - On/Off | Tekmar

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Overview

Details for 156

Difference Setpoint Control - On/Off

The Difference Setpoint Control 156 is designed to transfer heat from an intermittent heat source to a storage tank. This control can be used in applications ranging from solar thermal to wood boiler systems. 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 a single 240 V (ac) rated relay to accomplish this.

Features

Displays number of running hours of the relay
CSA and UL certified for use in the USA and Canada
24 V (ac) or 24 V (dc) power supply
Displays Delta-T hours to perform energy calculation
Monitor minimum and maximum temperatures for source and storage

Specifications

Item Number	156
Brand	Tekmar
Category	Setpoint and Pump Controls
Agency Approvals	CSA C US, meets class B: ICES & FCC Part 15
Ambient Conditions	Indoor use only, -20 to 120 degrees F (-30 to 50 degrees C), RH less than or equal to 90 percent Non-condensing
Control Type	Microprocessor control, this is not a safety (limit) control
Dimensions	4-3/4" H x 2-7/8" W x 7/8" D (120 x 74 x 22 mm)
Enclosure Material	White PVC plastic
Enclosure NEMA Rating	NEMA 1
Hydronic - HVAC Control Type	Difference Setpoint Control
Power Supply	24 V (ac) plus / minus 10 percent, 50/60 Hz, 3 VA, 24 V (dc) plus / minus 10 percent, 0.03 A
Relay	240 V (ac) 10 A max, 1/3 hp
Sensor	NTC thermistor, 10 k ohms at 77 degrees F (25 degrees C plus / minus 0.2 degrees C) Beta=3892