Double Element, Non-Simultaneous,
Three Phase Operation(continued).
Tank Does Not DeliverEnough Hot Water (continued)
7. Check voltageacross terminal L1 & L3 of lower thermostat (see illustration 16).
A) Rated voltageNOT present, check wire connection between thermostats.
B) Rated voltageis present, okay, go to step 8.
8. Adjust lower thermostatto highest setting. Water temperature in tank must be below
the lower thermostat setting for this test.
9. Check voltageacross terminal L4 & T2 of lower thermostat (see illustration 17).
A) Rated voltageNOT present, recheck ECO (see page 14). If ECO okay,
replace lower thermostat.
B) Rated voltageIS pres ent, thermostatis ok. Check wire connection to lower
element. If connection okay, recheck lowerelement (see page 15).
Illustration 16
Illustration 17
WARNING
High voltage exposure. Use caution to avoid
personal injury during this procedure.
WARNING
Be sure thermostats are reset to their original
temperature settings as found prior to
thermostat testing
Page 20
SERVICE PROCEDURE RE-III
Residential Thermostat Testing
Water Temperature In TankIs 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 heaterand set multi-meter to “Volts AC”.
4. Checka cross terminals L4 and T2 of upperthermostat
(see illustration 13 on page 19).
A) Rated voltage IS present, replaceupper 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 15).
5. Checkacross terminals L4 and T2 of lower thermostat (see illustration 17).
A) Rated voltage IS present, replacelower 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).
20