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Multiple Pump Relay (A3080301)
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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 Uponor sales representative for
assistance.
If the thermostat display intially powers on but later shuts off intermittently, 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 wires 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
R W
24 V
R W
H N
X X
H N H N
N H
Com
Switching Relay
Zone 1 Zone 2 Zone 3
Class 2
Transformer
R W
Zone 1 Zone 2 Zone 3
C
R
Rh W1 S1
Com
No Power
Floor Sensor
(A3040079)
L
N
Pump
