tekmar 260 Boiler Control User Manual

Page 13

03/09

13 of 20

Test The Sensors

In order to test the sensors, the actual temperature at each sensor
location must be measured. A good quality digital thermometer with a
surface temperature probe is recommended for ease of use and
accuracy. Where a digital thermometer is not available, a spare sensor
can be strapped alongside the one to be tested, and the readings
compared. Test the sensors according to the instructions in the Data
Brochure D 070.

Test The Power Supply

Make sure exposed wires and bare terminals are not in contact with
other wires or grounded surfaces. Turn on the power and measure
the voltage between the

Power L and Power N terminals (5 and 6)

using an AC voltmeter. The reading should be between 108 and 132
V (ac).

Test The Powered Inputs

Boiler Demand

Measure the voltage between the

Boiler Demand terminals (1 and

2). When the boiler demand device calls for heat, you should
measure between 20 and 260 V (ac) at the terminals. When the
boiler demand device is off, you should measure less than 5 V (ac).

DHW Demand

If a DHW demand is used, measure the voltage between the

DHW

Demand terminals (3 and 4). When the DHW demand device calls
for heat, you should measure between 20 and 260 V (ac) at the
terminals. When the DHW demand device is off, you should measure
less than 5 V (ac).

Test The Outputs

Boiler Pump (

Boil P1)

If the boiler pump is connected to the

Boil P1 terminal (7) and N

terminal (8), make sure power to the terminal block is off, and install
a jumper between the

Power L and the Boil P1 terminals (5 and 7).

Install a second jumper between

Power N and N terminals (6 and

8). When power is applied to the

Power L and Power N terminals (5

and 6), the boiler pump should start. If the pump does not turn on,
check the wiring between terminal block and pump, and refer to
any installation or troubleshooting information supplied with the
pump. If the pump operates properly, disconnect the power and
remove the jumpers.

DHW Pump or Valve (

DHW Pmp / Vlv)

If a DHW pump or DHW valve is connected to the

DHW Pmp / Vlv terminals (9 and

10), make sure power to the pump or valve circuit is off and install a jumper between
those terminals. When the DHW circuit is powered up, the DHW pump should turn on
or the DHW valve should open completely. If the DHW pump or valve fails to operate,
check the wiring between the terminals and the pump or valve, and refer to any
installation or troubleshooting information supplied with these devices. If the DHW
pump or valve operates properly, disconnect the power and remove the jumper.

Ω

Power

108 to 132 V (ac)

Ω

Boiler

Demand

20 to 260 V (ac)

Ω

DHW

Demand

20 to 260 V (ac)

DHW

Pmp/Vlv

24 to 240 V (ac)

120 V (ac)

Power

Boil
P1

Boiler
pump

Ω

14 15

Com Boil

Ω