Double Element, Simultaneous, Single Phase, 4 wire Service. Bradford-White Corp RE130L6, LD-65R3-3, RE120L6, LD-50S3-3, RE230LN6, LD-120R3-3, RE230L6, LD-80R3-3, RE240LN6, LE130L3-3

18

SERVICE PROCEDURE RE-III

Residential Thermostat Testing

Double Element, Non-Simultaneous, Single Phase

Operation (continued).

WARNING

High voltage exposure. Use caution to avoid personal injury during this procedure.

Not Enough Hot Water (continued).

7. Check voltage across terminal L4 of upper

thermostat and terminal 1 of lower thermostat

(see illustration 11).

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 of upper

thermostat and terminal 2 of lower thermostat (see illustration 12).

A) Rated voltage NOT present, replace lower thermostat.

B) Rated voltage IS present, thermostat is ok.

WARNING

Be sure thermostats are reset to their original temperature settings as found prior to thermostat testing

Illustration 11

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 illustration 8 on page 17).

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 2 of lower thermostat (see illustration 12).

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).

Page 18

Illustration 12