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© 2016 tekmar 518
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D - 06/16
Switching Relay
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Testing the Thermostat Wiring
Testing the Power
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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 permanently off:
1. Remove the thermostat front.
2. Use an electrical meter to measure voltage between the R and C wiring terminals.
For AC power supplies the voltage should measure between 10 to 30 V (ac). For
DC power supplies the voltage should measure between 10 to 30 V (dc).
3. If the voltage on the R and C wire terminations is continuous and the thermostat
display is not on, the thermostat may have a fault. Contact your tekmar sales
representative for assistance.
If the thermostat display intially powers on but later shuts off intermittantly, there
may be a short circuit from the W wire to ground, or the power supply is too small to
power the load.
Testing the Heat Zone Output Wiring
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1. Touch the
button and set the heating temperature above the current room
temperature. Make sure the display does not flash “Max” if using a floor sensor.
2. When the “Heat On” symbol appears on the display, use an electrical meter to check
for voltage on the W and C wires connected to the zone valve, wiring center, relay
or switching relay. The electrical meter should read 10 to 30 V (ac) or (dc).
3. If the W and C wire have voltage, check the zone valve, wiring center, relay or pump
to determine if the heat device is operating correctly.
Thermostat Wiring
C
518
R Rh W1 S1 Com
No Power
RW
24 V
RW
HNXX HNHN NH
Com
Switching Relay
Zone 1 Zone 2 Zone 3
Class 2
Transformer
RW
Zone 1 Zone 2 Zone 3
C
518
R Rh W1 S1 Com
No Power
C
518
R Rh W1 S1 Com Away
No Power
Optional
Slab Sensor 079
LN
Pump
Do not over
tighten wiring
screws. Hand
tighten only.
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