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591 Models
Procedure 1: Insulation resistance of the water heater Neutral Circuit. (Reading not
to be below 0.66 Mega ohm).
1. Isolate power to the water heater by removing fuse(s) or switching off circuit
breaker(s). Confirm with multi-meter across terminal block Active A1 and Neutral,
then Active A1 and Earth, then Neutral and Earth that voltage is not present.
2. Confirm with multi-meter across terminal block Active A2 and Neutral, then
Active A2 and Earth that voltage is not present.
3. Once satisfied, mark and disconnect the Active and Neutral wires from the water heater
terminal block. Note: if two independent power supply circuits are provided, both Active
wires must be disconnected; one from terminal A1 and the other from terminal A2.
4. Remove the wiring loop fitted between terminals A1 and A2. Note: this loop will not be
fitted if two independent power supply circuits are provided.
5. Connect megger leads to the Neutral of the water heater wiring and Earth.
6. Operate megger. A reading above 0.66 Mega ohm should be obtained.
7. If a reading below 0.66 Mega ohm is indicated, all component parts will need to be
individually tested to locate the fault. Refer to Fault Finding Chart 1.4 on page 30.
Procedure 2: Insulation resistance of the water heater Active Circuit (reading not to
be below 0.66 mega-ohm).
9. Connect megger leads to the Active A1 terminal of the water heater wiring and Earth.
10. Operate megger. A reading above 0.66 Mega ohm should be obtained.
11. If a reading below 0.66 Mega ohm is indicated, all component parts of the solar circuit
will need to be individually tested to locate the fault. Refer to Fault Finding Chart 1.4 on
page 30.
12. Connect megger leads to the Active A2 terminal of the water heater wiring and Earth.
13. Operate megger. A reading above 1 Mega ohm should be obtained.
14. If a reading below 1 Mega ohm is indicated, all component parts of the booster circuit
will need to be individually tested to locate the fault. Refer to Fault Finding Chart 1.4 on
page 30.
Procedure 3: To check "Continuity" of the water heater electrical circuit.
12. Set megger to resistance scale or multimeter to x1 resistance scale.
13. Measure between the Active A1 and Neutral terminals on the power supply terminal
block located behind the upper electrical access cover. The resistance should be
approximately 1.82 kilo ohms. If a reading outside this resistance value is obtained, all
electrical component parts of the solar circuit will need to be individually tested to locate
the fault. Refer to Specifications table on page 4 for indicative resistance values of
components.
14. Measure between the Active A2 and Neutral terminals on the power supply terminal
block located behind the upper electrical access cover. The resistance should be
approximately 22 – 26 ohms for 2.4
15. kW element models, 15 – 17 ohms for 3.6kW element models and 11 – 13 ohms for
4.8kW element models. If a reading outside these resistance values is obtained, all
booster electrical component parts will need to be individually tested to locate the fault.
16. Reconnect Active cables to A1 & A2 terminals and Neutral cable to N terminal at heater
terminal block.
17. Replace wire loop between terminals A1 and A2 if previously removed in step 4.
18. Replace fuse(s) or switch on circuit breaker(s). Note: If continuing with any
diagnostic procedures do not perform this step.
TM024 Premier Loline Solar Drain back Service Instructions REV: A
D.O.I: 12/12/2007
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