Bradford White RE3 Service Manual page 16

SERVICE PROCEDURE RE-III
Residential Thermostat Testing
Single Element Operation or Double Element,
4 Wire, Simultaneous, Single Phase Operation
Water In Tank Is Cold With Power ON
1. This procedure assumes line voltage, ECO and
elements are in working order.
2. Turn power "ON" to water heater.
3. Set multi-meter to "Volts AC."
4. Check across terminals L4 and T2 of
thermostat (see Figure 6).
A) Rated voltage NOT present,
Recheck ECO. If ECO is okay,
replace thermostat.
B) Rated voltage IS present,
proceed to next step.
5. Check across element terminals
(see Figure 7).
A) Rated voltage NOT present,
check wire connections from
thermostat to element.
B) Rated voltage IS present,
Repeat element testing
see page 15.
Water Temperature In Tank Is Above Thermostat Setting
1. This procedure assumes line voltage, ECO and
elements are in working order.
2. Turn power "ON" to water heater.
3. Set multi-meter to "Volts AC."
4. See Figure 6 above, check across terminals L4 and T2
of thermostat.
A) Rated voltage IS present,
replace thermostat.
B) Rated voltage NOT present,
thermostat is okay.
C) Lower than rated voltage IS present,
recheck for grounded element
(see page 15).
16
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Figure 6
Reference 4 Wire, Simultaneous, Single Phase
NOTE: Wiring consists of two single element configurations
Page 16
WARNING
Figure 7
Wiring diagram.
operating independently.