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DHW Call (Terminals 12, 13)

If the DHW sensor option is not used, a call for indirect domestic hot water can come from an aquastat connected

to terminals 12 and 13. The DHW Call can be volt free or up to 24 V (ac).

• Connect the DHW Call terminals 12 and 13 to the DHW tank aquastat.

Setpoint Call (Terminals 14, 15)

The setpoint call operates the boiler system to maintain a fixed setpoint temperature. The setpoint call should

respond to loads that do not change with outdoor conditions. The setpoint call can be volt free or up to 24 V (ac).

• Connect the setpoint call terminals 14 and 15 to the output terminals on a setpoint control or thermostat.

Central Heat Call (Terminals 10, 11)

A central heat call is required whenever the building requires heating. The heat call can be volt free or up to 24 V (ac).

• Connect the Central Heat Call terminals 10 and 11 to a switched heat demand.

• Typical heat calls are from a switching relay, zone valve control or thermostat.

• A permanent heat call can be created by installing a jumper wire between terminals 10 and 11.

Heat

10 11

+ Call -

Setpoint

14 15

+ Call -

DHW

12 13

+ Call -

Watts tekmar 294 User Manual

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