Install Instructions

8 of 20

A Watts Water Technologies Company

Testing the Thermostat Wiring

Only qualified personnel should perform testing procedures. A licensed electrician

is recommended.

Testing tN2 Wiring

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It is normal for the thermostat to take up to 20 seconds to power on once connected to

a tN2 system. If the thermostat display does not turn on after 20 seconds, try moving

the thermostat tN2 wire connections to another zone on the tN2 Wiring Center or tN2

Zone Manager. If the thermostat display does not power on, contact your tekmar sales

representative for assistance.

Testing tN4 and Stand Alone Wiring

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Power

If the thermostat display does not power on, remove the thermostat front and test for

24 V(ac) ±10% between the R and C wiring terminals. If the voltage is incorrect, check

the voltage at the transformer. If the transformer measures 24 V(ac) ±10% between the

R and C, then there may be an open circuit along the wires. If the thermostat display

turns off when powering the heat relay and the load, then the transformer VA capacity

is too small and a larger transfomer is required.

Heat Relay

Push the button and set the temperature below the current room or floor temperature.

There should be no "Heat On" symbol on the display. Measure the voltage on the heating

equipment (wiring center, zone valve or relay). The voltage measure 0 V(ac). Then push

the button and set the temperature above the current room or floor temperature. The

"Heat On" symbol should appear. Make sure that the display does not show "WWSD"

or "Max" which limit the operation of the heat relay. Measure the voltage on the heating

equipment (wiring center, zone valve or relay). The voltage should measure 24 V (ac).

If there is no voltage check to insure that any necessary jumper wires are installed and

check the wires for open or short circuits.

tN4 Communication

The symbol is shown on the display when communication is present. If the thermostat

is connected in a network and the communication is missing, there may be an open or

short circuit on the tN4 and C bus wires.