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.
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
|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|
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.
Jan 2011 - Present
Installation & Operation Manual
Jun 2010 - Present
Jun 2010 - Dec 2013
More advanced application drawings can be found in our Solutions section.