tekmar Boiler Control 256

Boiler Control 256

Control Description The Boiler Control 256 is a microprocessor-based control designed to regulate the supply water temperature from a single boiler based on the outdoor temperature. To avoid boiler short cycling and large temperature swings, the 256 is able to continuously adjust the boiler differential. The 256 includes control functions such as Warm Weather Shut Down (WWSD) and Minimum Boiler setting. The control has a liquid crystal display (LCD) that normally displays the Boiler Supply temperature, but can display other temperatures and settings.

Literature	—	D 256, A 256's, D 001, D 070
Control	—	Microprocessor PID control; This is not a safety (limit) control
Packaged Weight	—	1.3 lb. (580 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 C US, meets ICES & FCC regulations for EMI/RFI
Ambient Conditions	—	Indoor use only, 32 to 104°F (0 to 40°C), < 90% RH non-condensing
Power Supply	—	24 V ±10% 50/60 Hz 3 VA
Relay	—	240 V (ac) 5 A 1/6 hp, pilot duty 240 VA
Demand	—	24 V (ac) 2 VA
Sensors Included	—	NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892 Outdoor Sensor 070 & Universal Sensor 071
Optional Devices	—	tekmar type #: 031, 032

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Literature

Control

Packaged Weight

Dimensions

Approvals

Ambient Conditions

Power Supply

Relay

Demand

Sensors Included

Optional Devices