SERVICE PROCEDURE
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 9).
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 10).
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 |
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
4.Check across terminals L4 and T2 of upper thermostat (see illustration 6 on page 10).
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 9).
5.Check across terminals L4 and 2 of lower thermostat (see illustration 10).
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 9).
Page 11
Illustration 9
Illustration 10
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