ClimateMaster Geo-Thermal: Heating
Re: Water Lines Sweating
The well piping from the geo-thermal unit is cold and sweating.
It is not unusual for the well loop temperature to get cold when running in the heating mode.
- As the geo-thermal unit runs in heating it absorbs heat from the loop water and transfers it into the conditioned space.
- Long run cycles can cause the water to fall below freezing temperatures. Therefore, it is necessary to add an anti-freeze solution to the well water and make sure that the piping is adequately insulated.
| Qty |
Possible Causes: |
| 1 |
Insulation Loose |
|
Low Water Flow |
|
Under-Sized Wells |
| 1 |
Unit Over-Worked |
|
Under-Sized Unit |
|
Cold Water on HWG |
CHECKOUT:
1. Check Operating Conditions
- Set the thermostat to call for heat and ensure that the unit is running at full capacity (Y1 & Y2 Energized).
- Unplug the 3-wire heater connector from the control board to temporarily prevent aux heater operation.
- Allow the unit to operate for at least 5 minutes.
- Check and record the HWG Inlet and Outlet Temperatures (if present).
- Cold HWG temperatures drastically affect operating conditions and can cause excessive unit operation.
- Make sure bottom heating element of water heater is operational and thermostat is set for approx. 120 deg.
- Unplug the HWG pump motor power (if the HWG piping is hooked-up and active).
- Check and record the Water Pressure Drop through the geo-thermal unit.
- Check and record the Entering Water Temperature and the Leaving Water Temperature.
- Check and record Refrigerant Pressures.
- Check and record the Air Temperature Rise through the unit.
2. Compare to Unit Performance Chart
- Use Flow Sheet to convert pressure drop to GPM and then GPM per Ton
- Compare actual operating conditions to Unit Performance Chart.
3. Check Auxiliary Heaters
- Plug the 3-wire heater plug back into the control board.
- Ensure that the thermostat is calling for Aux Ht.
- Check for 24VAC between "W" and "C" on the LTB.
- No Voltage = No Call form Thermostat
- Voltage = Heaters should be active.
- Check output from the CXM board to the heater board. (DC Voltage)
- Check for 18-24VDC on the 3-wire heater plug between Black & Red and Black & White.
- Check for 230V to the heater breakers and ensure that the breakers are turned on.
- Use an Amp Probe to check heater amperage.
- No amperage = Bad Heater Board
4. Check Insulation
- Ensure that the loop piping is insulated and that the insulation is properly secured.