tekmar Boiler Control 275

Boiler Control 274

Control Description The Boiler Control 274 operates up to four on/off boilers to provide outdoor reset operation, domestic hot water and setpoint operation with priority. When operating as a tN4 System Control, the 274 can connect with up to 24 tN4 devices on a single boiler bus. The 274 has primary pump sequencing capabilities along with a flow proof or combustion air damper proof demand.

Literature	—	D 274, A 274, D 001, D 070, SB050
Control	—	Microprocessor PID control; This is not a safety (limit) control
Packaged Weight	—	3.5 lb. (1600 g), Enclosure A, blue PVC plastic
Dimensions	—	6-5/8" H x 7-9/16" W x 2-13/16" D (170 x 193 x 72 mm)
Approvals	—	Certified to CSA C22.2 Nº 24-93
Ambient Conditions	—	Indoor use only, 32 to 122°F (0 to 50°C), < 90% RH non-condensing
Power Supply	—	115 V (ac) ±10% 50/60 Hz 7 VA, 1150 VA max
Relays	—	230 V (ac) 5 A 1/3 hp
Demands	—	20 to 260 V (ac) 2 VA
Sensors Included	—	NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892 Outdoor Sensor 070 and 2 of Universal Sensor 082

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Literature

Control

Packaged Weight

Dimensions

Approvals

Ambient Conditions

Power Supply

Relays

Demands

Sensors Included