WARNING
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Double Element, Non-Simultaneous,
Single Phase Operation (continued)
Tank Does Not DeliverEnough Hot
Water (continued).
7. Check voltageacross terminal L3 of upper
thermostat & T2 of lower Thermostat.
(see illustration 32).
A) Rated voltageNOT present,
Replace lower thermostat.
B) Rated voltageis present, okay,
go to step 8.
8. Check voltageacross lower element
(see illustration 33).
A) Rated voltageNOT present,
Check wire connections between
thermostats & element.
B) Rated voltageIS present,
Repeat element testing
see page 15.
Illustrat ion 32 Illustration 33
WARNING
Be sure thermostats are reset to
their original temperature settings
as found prior to thermostat
testing
Illustration 34
Water Temperature In Tank Is Above Thermostat Setting.
1. This procedureassumes 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 32 above. Check across terminal L3 of upper thermostat
& T2 of lower thermostat.
A) Rated voltageIS present, replace lower thermostat.
B) Rated voltageNOT present, okay, go to step 5 below.
C) Lower than rated voltage IS present,recheck for grounded lower
element seepage 15.
5. Check acrossterminal L4 & T2 of upper thermostat (seeillustration 34).
A) Rated voltageIS present, replace upper thermostat.
B) Rated voltageNOT present, upper thermostat is okay.
C) lowerth an rated voltage IS present, recheckfor grounded upper
element seepage 15.
Page 26
SERVICE PROCEDURE RE-IV
Light Duty Commercial
Thermostat Testing
26