tekmar 260 Boiler Control User Manual

Page 12

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DHW Pump / Valve Contact

The

DHW Pmp / Vlv terminals (9 and 10) are an isolated output in the 260. There is no

power available on these terminals from the control. These terminals are to be used
as a switch to either make or break power to the DHW pump or DHW valve. Since this
is an isolated contact, it may switch a voltage between 24 V (ac) and 240 V (ac).

Boiler Contact

The

Boiler terminals (11 and 12) are an isolated output in the 260. There is no power

available on these terminals from the control. These terminals are to be used as a
switch to either make or break the boiler circuit. When the 260 requires the boiler to
fire, it closes the contact between terminals 11 and 12.

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 (14 and 16). The outdoor sensor is used by the

260 to measure the outdoor air temperature.

Boiler Sensor

Connect the two wires from the Boiler Sensor 0

82 to the Com and

Boil terminals (14 and 15). The boiler sensor is used by the 260 to
measure the supply (outlet) water temperature from the boiler.

Indoor Sensor

If an indoor sensor is used, connect the two wires from the sensor
to the

Com and Indr terminals (17 and 18). The indoor sensor is

used by the 260 to measure the room air temperature.

Unoccupied Switch

If an external timer (tekmar Timer 03

2) or switch is used, connect the two wires from

the external switch to the

UnO Sw and Com terminals (13 and 14). When these two

terminals are shorted together, the control registers an unoccupied signal.

STEP FIVE

TESTING THE WIRING

Each terminal block

must be unplugged from its header on the control before power is applied for testing. To remove a terminal

block, pull it straight down from the control.

The following tests are to be performed using standard testing practices and procedures, and should only be carried out by properly
trained and experienced persons.

A good quality electrical test meter, capable of reading from at least 0 - 300 V (ac) and at least 0 - 2,000,000 Ohms, is essential to
properly test the wiring and sensors.

DHW

Pmp/Vlv

24 to 240 V (ac)

11 12

Boiler

Com

Boil

Out

17 18

Com Indr

Boiler
sensor

14 15

Com Boil

13 14

Timer Switch

UnO
Sw

Com