tekmar 553 Thermostat Installation User Manual

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553_D - 09/14

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A Watts Water Technologies Company

Testing tekmarNet

2 Wiring

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Testing the Power
If the thermostat display turns on, this indicates that the thermostat is operating
correctly and there are no electrical issues. In the event that the display is off, or the
display is cycling on and off:
1. Remove the thermostat wiring cover.
2. Check to ensure that the tN2 wires on the thermostat are connected to a zone on a

House Control, Wiring Center, or Zone Manager.

3. Use an electrical meter to measure DC voltage between the tN2 terminals.

If the DC voltage is 0 V (dc) for at least 20 seconds, then there is an open or
short circuit in the tN2 wires.
If the DC voltage is 0 V (dc) for 10 seconds and then is 23 to 24 V (dc) for 5
seconds, this indicates the wiring is correct.

4. If the thermostat display is off, or is cycling on and off, move the thermostat to the

next available zone on the House Control, Wiring Center, or Zone Manager.

If the thermostat display remains permanently on, there may be a fault with the
previously tried zone on the House Control, Wiring Center, or Zone Manager.
If the thermostat display continues to be off, or is cycling on and off, there may
be a fault on the thermostat.

If a fault is suspected, contact your tekmar sales representative for assistance.

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Testing the Thermostat Wiring

Only qualified personnel should perform testing procedures. A licensed electrician
is recommended.