Compatible Sensors; Testing The Thermostat Wiring - Tekmar tekmarNet 557 Installation & Operation Manual

Compatible Sensors

The thermostat is compatible with Indoor Sensor type 076, 077, 084, Slab Sensor
type 072, 073, 079, Outdoor Sensor type 070, Duct Sensor type 083 and Humidity &
Temperature Sensor type 086.

Testing the Thermostat Wiring

Testing tekmarNet
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.
Testing tekmarNet
Testing the Power
1. Remove the front cover from the thermostat.
2. Use an electrical test meter to measure (ac) voltage between the R and C terminals.
The reading should be 24 V (ac) +/– 10%.
3. Install the front cover.
Testing the Relay Outputs
The thermostat includes a User Test to check if the thermostat's relays are operating
and that the thermostat is wired correctly to the HVAC equipment. The User Test setting
can be located in the Toolbox menu. Either Heat or Cool test can be selected.
Cancel button - Exits the user test and returns the Toolbox menu.
Hold button - Pauses the user test step for up to 5 minutes.
Next Item button - Advances the user test to the next test step.
A Watts Water Technologies Company
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4 and Stand Alone Wiring
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