Geothermal Heatpump Troubleshooting
Geothermal Heatpump Troubleshooting
Please use this site to assist you in troubleshooting most geothermal heatpumps.
These guide lines should help;
Although please note that I am not responsable for any damage to any equipment that you work on following these guide lines.
If operational difficulties are encountered, perform the preliminary checks below before referring to the troubleshooting charts.
Because some controls are mounted internally and high voltage connections are exposed if the cabinet is opened, only a qualified technician should access them.
I'll be constantly working on this site so check back.
General
* Check the air filter.
* Check the water supply.
* Verify that the unit is receiving electrical supply power.
* Verify that there is pressure in the loop.
* Verify that the loop pumps are running.
After completing the preliminary checks described above,
inspect for other obvious problems such as leaking connections,
broken or disconnected wires, etc.
Field Inputs
Be certain that the thermostat is set higher than the actual room temperature and the selector switch to heat if in heating mode, or that the thermostat is set lower than room temperature and the selector switch is on cool if air conditioning is desired. If the thermostat is programmable, make sure it has fresh batteries.
All inputs are 24VAC from the thermostat and can be verified using a volt meter between C and Y, G, O, W.
24VAC will be present at the terminal.
For example,
between Y and C if the thermostat is sending an input to the compressor;
between G and C if the thermostat is sending an input to the blower;
between O and C if the thermostat is sending an input to the reversing valve for cooling;
between W and C if the thermostat is sending an input to the auxillery or emergency heat (heat strip);
Outputs
The compressor relay input is 24VAC and can be verified using a voltmeter.
The fan signal is usually passed to an external fan relay and the input is 24VAC and can be verified using a voltmeter.
Performance Troubleshooting Chart available online.
Copyright 2007-2009 McCommons Construction
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