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257 | DHW Control - Two Stage | Tekmar

Brand: TekmarSKU: 257

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Overview Details for 257

DHW Control - Two Stage

The DHW Control 257 is designed to operate multiple boilers for volume water heating. It can be used in hotels, apartments, and laundromats to control multiple boilers and provide quick recovery for domestic hot water. This control regulates a single hot water temperature through DHW control. It is capable of controlling up to 2 on/off boilers using a sensor to maintain a tank setpoint temperature.

Features

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

Specifications

Item Number	257
Brand	Tekmar
Category	Boiler / DHW Controls
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