DHW Control 257
Control Description The DHW Control 257 is used for dedicated domestic hot water systems. The control operates two on/off boilers, or one two-stage boiler to maintain the DHW Target temperature at the DHW Sensor. The control can operate in Proportional (P) mode, or Proportional, Integral, Derivative (PID) mode using solar collectors or a wood boiler as a heat source.
Literature |
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Control |
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Microprocessor control; This is not a safety (limit) control |
Packaged Weight |
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0.78 lb. (355 g) |
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Enclosure C, White PVC plastic |
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Dimensions |
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4-3/4" H x 2-7/8" W x 7/8" D (120 x 74 x 22 mm) |
Approvals |
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CSA certified to CSA C22.2 #24 and UL # 508 |
Ambient Conditions |
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Indoor use only, 32 to 122°F (0 to 50°C), < 90% RH non-condensing |
Power Supply |
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24 V ±10% 50/60 Hz 2 VA |
Relay |
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240 V (ac) 10 A 1/3 hp, pilot duty 240 VA |
Sensors Included |
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NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892 One Universal Sensor 071 |
Optional |
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tekmar type #078,082 |
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