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Description

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
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Specs
Application:

Two Stage

Width:

2-7/8"

Height:

4-3/4"

Stages:

2 Boiler

1 Two-Stage Boiler

User Interface:

LCD

Push Button

Voltage:

24v

Type:

DHW

Depth (Inches):

7/8"

Ambient Conditions:

Indoor Only: 32°-122°F < 90% RH non-condensing

Power Supply:

24V

Relays:

240 V (ac) 10 A-1/3 hp- pilot duty 240 VA

Temperature Range (F):

-60°F - 255°F

Min Temp (F):

-60°F

Max Temp (F):

255°F

Control:

Microprocessor Control

Weight (lbs):

.7 lbs

Sensors:

NTC Thermistor 10 k ohm @ 77°F

Enclosure Type:

C

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