Tekmar DHW Control - Two Stage

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 — Control — Microprocessor control; This is not a safety (limit) control Packaged Weight — 0.78 lb. (355 g) — Enclosure C, White PVC plastic Dimensions — 4-3/4" H x 2-7/8" W x 7/8" D (120 x 74 x 22 mm) Approvals — CSA certified to CSA C22.2 #24 and UL # 508 Ambient Conditions — Indoor use only, 32 to 122°F (0 to 50°C), < 90% RH non-condensing Power Supply — 24 V ±10% 50/60 Hz 2 VA Relay — 240 V (ac) 10 A 1/3 hp, pilot duty 240 VA Sensors Included — NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892 One Universal Sensor 071 Optional — tekmar type #078,082