257

Part of the 257 Series

Ordering Code: 257

UPC: 779655025701

DHW Control, Two Stage

 

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  • 2 stage control
  • Proportional or PID staging
  • Equal runtime rotation
  • Cumulative boiler run time hours
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" 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 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