tekmar 374 Universal Reset Control User Manual

Page 21

21 of 36

DHW Demand

If a DHW demand is used, measure the voltage between the
DHW Dem and the Com Dem terminals (29 and 31). When the DHW
demand device calls for heat, between 20 and 260 V (ac) should be
measured at the terminals. When the DHW demand device is off,
less than 5 V (ac) should be measured.

Setpoint Demand

If a setpoint demand is used, measure the voltage between the
Setp Dem and the Com Dem terminals (28 and 31). When the
setpoint demand device calls for heat, between 20 and 260 V (ac)
should be measured at the terminals. When the setpoint demand
device is off, less than 5 V (ac) should be measured.

Mix 1 Demand

If a mix 1 demand is used, measure the voltage between the
Mix1 Dem and the Com Dem terminals (25 and 26). When the mix 1
demand device calls for heat, between 20 and 260 V (ac) should be
measured at the terminals. When the mix 1 demand device is off,
less than 5 V (ac) should be measured.

Mix 2 Demand

If a mix 2 demand is used, measure the voltage between the
Mix2 Dem and the Com Dem terminals (27 and 26). When the mix 2
demand device calls for heat, between 20 and 260 V (ac) should be
measured at the terminals. When the mix 2 demand device is off,
less than 5 V (ac) should be measured.

Test the Outputs

Primary Pump (Prim P1)

If a primary pump is connected to the

Prim P1 terminal (16), make sure that power

to the terminal block is off and install a jumper between the

Power L and Prim P1

terminals (14 and 16). When power is applied to the

Power L and Power N terminals (14

and 15), the primary pump should start. If the pump does not turn on, check the wiring
between the 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 jumper.

Mix 1 Pump (Mix 1 P2)

If a mix 1 pump is connected to the

Mix1 P2 terminal (13), make sure that power to the

terminal block is off and install a jumper between the

Power L and Mix1 P2 terminals

(14 and 13). When power is applied to the

Power L and Power N terminals (14 and

15), the mix 1 pump should start. If the pump does not turn on, check the wiring
between the 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 jumper.

Mix 2 Pump (Mix 2 P3)

If a mix 2 pump is connected to the

Mix2 P3 terminal (17), make sure that power

to the terminal block is off and install a jumper between the

Power L and Mix2 P3

terminals (14 and 17). When power is applied to the

Power L and Power N terminals

(14 and 15), the mix 2 pump should start. If the pump does not turn on, check the wiring
between the 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 jumper.

Stage 1 / Boil Enable Contact

If an on / off boiler or a Lo fire boiler stage is connected to the

Stage 1 / Boil Enbl.

terminals (21 and 22), make sure power to the boiler circuit is off, and install a jumper
between the terminals. When the boiler circuit is powered up, the boiler should fire.
If the boiler does not turn on, refer to any installation or troubleshooting information
supplied with the boiler. (The boiler may have a flow switch that prevents firing until
the primary pump (

Prim P1) is running). If the boiler operates properly, disconnect the

power and remove the jumper.

Boil

Dem

Com

Dem

DHW

Dem

20 to 260 V (ac)

Com

Dem

Mix1

Dem

115 V (ac)

Prim

Power

115 V (ac)

Mix1

Power

Prim

Mix2

115 V (ac)

Power

Stage 1/

Boil Enbl.