tekmar 552 Thermostat Installation User Manual

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552_D - 09/14

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A Watts Water Technologies Company

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 front.

2. 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.

3. Connect the thermostat to the tN2 wires connected to a zone on a House Control,

Wiring Center, or Zone Manager.

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.

Testing the Heat Zone Output Wiring

1. Touch the

button and set the heating temperature above the current room

temperature. Make sure the display does not show “WWSD” or “Floor Max”.

2. When the “Heat On” symbol appears on the display, use an electrical meter to

check for voltage on the House Control, Wiring Center, or Zone Manager relay.
The voltage is 24 V (ac) for zone valves, and 120 V (ac) for zone pumps when
operating correctly.

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Testing the Thermostat Wiring

Testing tekmarNet

2 Wiring

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