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WARNING
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Illustration 47
Illustration 48
Double Element, Simultaneous, Three Phase
Operation.
Water In Tank Is Cold Or Not Enough Hot
Water With Power ON.
1. This procedure assumes line voltage,
ECO and elements are in working order.
2. Adjust temperature setting for both
thermostats to the highest setting.
3. Turn power “ON” to water heater.
4. Set multi-meter to “Volts AC”
5. Check across terminals L4 and T2 of
upper thermostat (see illustration 47).
A) Rated voltage NOT present,
Recheck upper ECO
(see page 14). If ECO
is okay, replace upper thermostat.
B) Rated voltage IS present,
proceed to next step.
6. Check across upper element terminals
(see illustration 48).
A) Rated voltage NOT present,
check wire connections from
thermostat to upper element.
B) Rated voltage IS present,
Repeat element testing
see page 15
7. Check across terminal L4 of upper thermostat
and T2 of lower thermostat (see illustration 49).
A) Rated voltage NOT present,
Check ECO (see page 14) & wire
connections at upper & lower
thermostats. If okay, replace
lower thermostat.
B) Rated voltage IS present,
proceed to next step.
8. Check across lower element terminals
(see illustration 50).
A) Rated voltage NOT present,
check lower element wire
connections to thermostat.
B) Rated voltage IS present,
Repeat lower element testing
see page 15.
Illustration 49
WARNING
Be sure thermostats are reset to
their original temperature settings
as found prior to thermostat
testing
Illustration 50
Page 31
SERVICE PROCEDURE RE-IV
Light Duty Commercial
Thermostat Testing
31