Heating Tekmar Setpoint Controls | 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) S=3892 One Universal Sensor 071

Optional

Tekmar Type #078,082