SERVICE PROCEDURE RE-III
Residential Thermostat Testing
Double Element, Simultaneous, Three 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
5.Check across terminals L4 and T2 of upper thermostat (see illustration 22).
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 terminals L4 and T2 of lower thermostat (see illustration 23).
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).
WARNING
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Illustration 22
Illustration 23
Page 22
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