Bradford White U-TW4-75S-76R-3N - Manual (Page 28)

Simulated
Resistive device
Step 1. Position power switch on gas control to the
“OFF” position.
Step 2. Disconnect simulated resistive device from
gas control.
Step 3. Using a multi-meter set to the ohms setting
check resistance of simulated resistive
device. Resistance must be within 25,000
ohms and 45,000 ohms. If outside of this
range replace the simulated resistive device.
If there is no continuity test the resettable
thermal switch by following SERVICE
PROCEDURE IX. If the resettable thermal
switch is closed replace the simulated
resistive device
Simulated Resistive Device Testing
Simulated
Resistive device
Electronic
“pin type”
Meter Probes
Multi-meter set to
ohms setting
Resettable Thermal
Switch
U TTW SERVICE PROCEDURE VIII
Simulated Resistive Device Testing
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