Bradford White RE3 Service Manual page 24

SERVICE PROCEDURE RE-III
Residential Thermostat Testing
Double Element, Non-Simultaneous,
Single Phase, Off Peak Operation.
(continued)
N
ot Enough Hot Water (continued).
7. Check voltage across terminal T4 of upper
thermostat & T2 of lower thermostat.
(see Figure 27).
A) Rated voltage NOT present,
replace lower thermostat.
B) Rated voltage is present, okay,
go to step 8.
8. Check voltage across lower element
(see Figure 28).
A) Rated voltage NOT present,
check wire connections between
thermostats & element.
B) Rated voltage IS present,
repeat element testing
see page 15.
Be sure thermostats are reset to their original
temperature settings as found prior to
thermostat testing
Water Temperature In Tank Is Above Thermostat Setting.
1. This procedure assumes line voltage, ECO and elements are in working order.
2. Adjust upper and lower thermostats to the lowest setting.
3. Turn power "ON" to water heater and set multi-meter to "Volts AC."
4. Check across terminals L4 and T2 of upper thermostat (see Figure 24 on page 23).
A) Rated voltage IS present, replace upper thermostat.
B) Rated voltage NOT present, upper thermostat is okay. Go to step 5 below.
C) Lower than rated voltage IS present, recheck for grounded upper element (see page 15).
5. Check across terminals T4 of upper thermostat and T2 of lower thermostat (see Figure 27 above).
A) Rated voltage IS present, replace lower thermostat.
B) Rated voltage NOT present, lower thermostat is okay.
C) Lower than rated voltage IS present, recheck for grounded lower element (see page 15).
24
WARNING
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Figure 27
Page 24
WARNING
Figure 28