Tekmar Boiler Control 265 Data Brochure page 23

SENSOR AND UNPOWERED INPUT CONNECTIONS
Do not apply power to these terminals as this will damage the control.
Outdoor Sensor
Connect the two wires from the Outdoor Sensor 070 to the Com and Out terminals (1 and 4).
The outdoor sensor is used by the control to measure the outdoor air temperature.
Boiler Supply Sensor
Connect the two wires from the Boiler Supply Sensor 071 to the Com and Boil Sup
terminals (1 and 2). The boiler supply sensor is used by the control to measure the boiler
supply water temperature.
Boiler Return Sensor
Connect the two wires from the Boiler Return Sensor 071 to the Com and Boil terminals
(1 and 3). The boiler return sensor is used by the control to measure the boiler return
water temperature.
UnOccupied Switch
If an external timer (tekmar Timer 032) or switch is used, connect the two wires from the
external switch to the Com and UnO Sw terminals (1 and 5). When these two terminals
are shorted together, the control registers an unoccupied (UNOCC) signal.
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Timer Switch
© 2010 D 265 - 07/10