Automatic operation of the controller can be determined only if the solar tank is 15°F
warmer than the bottom of the standard water heater. For a cold system test, refer to
the trouble shooting section in the Appendix for testing Delta-T controllers.
Appendix 1
. Troubleshooting
Before troubleshooting the system, make sure there really is a problem. Sometimes
circuits do not work because a temperature limit is satisfied or the circuit control is off.
Make sure all circuits have power. In many cases, tracing the steps in the installation
section will reveal an error. Proper trouble shooting requires the right tools. In addition
to hand tools, a digital voltmeter and temperature sensor resistance chart are needed
for electrical testing. Asking the right questions is very important in pinpointing a
problem quickly.
The different electrical circuits of a HoloTech
tm
solar system are all independent and can
be treated separately. This simplifies the procedure considerably. The circuits are
• Collectors
• Domestic Hot Water
• Space Heating
• Pool/Spa
A1.1
Collector System
Table A1.1 Collector System Troubleshooting
Problem
Cause
1. Sunny Day - System not operating
1. Solar control OVT sensor satisfied
2. Power OFF / controller OFF
3. Controller failure
4. Broken lead to collector COL sensor
5. Shorted lead to tank STO sensor
6. Shorted lead to tank OVT sensor
7. High sensor not insulated
8. Bad collector pump(s)
9. Tank out of water
2. Pump runs at night
1. Outside temp is warmer than tank temp
(Very rare -only on new system in summer)
2. Controller failure
3. Broken lead to tank STO sensor
4. Shorted lead to collector COL sensor
Check all sensor lead wires for short circuits due to staples driven into the wire, or for
cut wires, or for wire connections which have become corroded or loose.
HoloTech
tm
Solar Installation Manual
20
