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WARNING
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Double Element, Non-Simultaneous,
Three Phase Operation (continued).
Tank Does Not Deliver Enough Hot Water
(continued).
7. Check voltage across terminal L1 of upper
thermostat & T2 of lower Thermostat.
(see illustration 44).
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 illustration 45).
A) Rated voltage NOT present,
Check wire connections between
thermostats & element.
B) Rated voltage IS present,
Repeat element testing
see page 15.
Illustration 44
Illustration 45
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 illustration 44 above. Check across terminal L1 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.
5. Check across terminal L4 & T2 of upper thermostat (see illustration 46).
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.
Illustration 46
Page 30
SERVICE PROCEDURE RE-IV
Light Duty Commercial
Thermostat Testing
30