Bradford White RE3 Service Manual page 26

SERVICE PROCEDURE RE-IV
Light Duty Commercial
Thermostat Testing
Double Element, Non-Simultaneous,
Single Phase Operation (continued)
Tank Does Not Deliver Enough Hot
Water (continued).
7. Check voltage across terminal L3 of upper
thermostat & T2 of lower Thermostat.
(see Figure 32).
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 33).
A) Rated voltage NOT present,
Check wire connections between
thermostats & element.
B) Rated voltage IS present,
repeat element testing
see page 15.
WARNING
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 thermostat to the lowest setting.
3. Turn power "ON" to water heater and Set multi-meter to "Volts AC."
4. See Figure 32 above. Check across terminal L3 of upper thermostat
& T2 of lower thermostat.
A) Rated voltage IS present, replace lower thermostat.
B) Rated voltage NOT present, okay, go to step 5 below.
C) Lower than rated voltage IS present, recheck for grounded lower
element see page 15.
5. Check across terminal L4 & T2 of upper thermostat (see Figure 34).
A) Rated voltage IS present, replace upper thermostat.
B) Rated voltage NOT present, upper thermostat is okay.
C) Lower than rated voltage IS present, recheck for grounded upper
element see page 15.
26
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Figure 32
Page 26
WARNING
Figure 33
Figure 34