Testing the Thermostat Wiring. Watts 519, 300152S, ProMelt Patio Warming Control PM-519

Switching Relay ----------------------------------------------------

R

No Power

Rh W1 S1 Com

Floor

Sensor 079

24 V

Com

Class 2

Transformer

X X

R W R W

Zone 1 Zone 2

R W

Zone 3

Switching Relay

Zone 1

H N

Zone 2

H N

Zone 3

H N N H

Pump

N L

Testing the Thermostat Wiring

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 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

Watts Radiant sales representative for assistance.

If the thermostat display initially powers on but later shuts off intermittently, there may be a short circuit from the W1 wire to ground, or the power supply is too small to power the load.

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 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 W1 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 W1 and C wire have voltage, check the zone valve, wiring center, relay or pump to determine if the heat device is operating correctly.

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