Description
Tekmar 257 Control - Domestic Hot Water - Two Stage
Features:
- 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" x 2-7/8" x 7/8" (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
Installation Manual
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