Difference Setpoint Control 155

The Difference Setpoint Control 155 is designed to transfer heat from an intermittent heat source to a storage tank. It 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 energize a pump when there is a positive difference between the two respectively. This product uses 2 relays to accomplish this; relay 1 is a dry contact that can operate a pump (240 V (ac) dry contact), and relay 2 can be used for drain down solar installations.

Features & Specs

Features (definitions)

• 24 V (ac) or 24 V (dc) power supply

• CSA and UL certified for use in the USA and Canada

• Displays ΔT• hours to perform energy calculation

• Monitor minimum & maximum temperatures for source & storage

Specifications

Control	Microprocessor control. This is not a safety (limit) control
Packaged weight	1.0 lb. (450 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, -20 to 120°F (-30 to 50°C), RH ≤90% Non-condensing
Power supply	24 V (ac) ±10%, 50/60 Hz, 3 VA, 24 V (dc) ±10%, 0.03 A
Relays	240 V (ac) 10 A max, 1/3 hp
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

In most cases the current version of literature will work, otherwise use the piece of literature most closely matching the date code of your product.

Current Literature

Product Submittal	Jan 2011 - Present	155_C
Installation & Operation Manual	Jun 2010 - Present	155_D

Applications

Product Application Drawings

Application Brochure

Jun 2010 - Current

155_A

More advanced application drawings can be found in our Solutions section.