Bradford White RE3 Service Manual page 28

SERVICE PROCEDURE RE-IV
Light Duty Commercial
Thermostat Testing
Double Element, Simultaneous, Single Phase
Operation (continued)
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 thermostat to the lowest setting.
3. Turn power "ON" to water heater.
4. Set multi-meter to "Volts AC."
5. Check across terminals L4 and T2 of
upper thermostat (see Figure 39).
A) Rated voltage IS present,
replace upper thermostat.
B) Rated voltage NOT present,
upper thermostat is okay. Go to step 6 below.
C) Lower than rated voltage IS present,
recheck for grounded upper element
see page 15.
6. Check across terminal L3 of upper thermostat and
T2 of lower thermostat (see Figure 40).
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.
28
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Figure 39
Figure 40
Page 28
WARNING