Bradford White RE3 Service Manual page 20

SERVICE PROCEDURE RE-III
Residential Thermostat Testing
Double Element, Non-Simultaneous,
Three Phase Operation (continued).
Tank Does Not Deliver Enough Hot Water (continued)
7. Check voltage across terminal L1 & L3 of lower thermostat (see Figure 16).
A) Rated voltage NOT present, check wire connection between thermostats.
B) Rated voltage is present, okay, go to step 8.
8. Adjust lower thermostat to highest setting. Water temperature in tank must be below
the lower thermostat setting for this test.
9. Check voltage across terminal L4 & T2 of lower thermostat (see Figure 17).
A) Rated voltage NOT present, recheck ECO (see page 14). If ECO okay,
replace lower thermostat.
B) Rated voltage IS present, thermostat is ok. Check wire connection to lower
element. If connection okay, recheck lower element (see page 15).
Be sure thermostats are reset to their original
temperature settings as found prior to
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 13 on page 19).
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 L4 and T2 of lower thermostat (see Figure 17).
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).
20
WARNING
thermostat testing
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Page 20
WARNING
Figure 16
Figure 17