155
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Discontinued - Replaced By: 156
Part of the Setpoint Controls Series
Ordering Code: 155
UPC: 779655015508
Difference Setpoint Control
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
- 24 V (ac) or 24 V (dc) power supply
- Monitor minimum and maximum temperatures for source and storage
- Displays Delta-T hours to perform energy calculation
- CSA and UL certified for use in the USA and Canada
| Specifications | |
|---|---|
| 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 IN H x 2 7/8 IN W x 7/8 IN 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 |