257
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Part of the Multi-Staging Controls Series
Ordering Code: 257
UPC: 779655025705
DHW Control, Two Stage
The DHW Control 257 is designed to operate multiple boilers for volume water heating. It can be used in hotels, apartments, and laundromats to control multiple boilers and provide quick recovery for domestic hot water. This control regulates a single hot water temperature through DHW control. It is capable of controlling up to 2 on/off boilers using a sensor to maintain a tank setpoint temperature.
- Equal runtime rotation
- Cumulative boiler run time hours
- Proportional or PID staging
- 2 stage control
| 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 | DHW Control |
| Power Supply | 24 V (ac) plus / minus 10 percent, 50/60 Hz, 3 VA |
| 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 |