SERVICE PROCEDURE RE-IV
Light Duty Commercial
Thermostat Testing
Double Element,
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.
WARNING
Be sure thermostats are reset to their original temperature settings as found prior to thermostat testing
WARNING
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Illustration 44 |
| Illustration 45 |
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
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.
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Illustration 46
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