TTHERM GEO TVA series, Installation & Operating Instructions Manual

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12/06/2012 35 GI202
Power On Startup
Before applying power to the heat pump, check the following items:
1. All plumbing and ductwork to the heat pump is complete and operational.
2. Low voltage wiring of the thermostat and any additional control wiring is complete.
3. Set thermostat to the
OFF
position.
4. All high voltage wiring is correct including disconnect and wire sizes.
5. The heat pump is located in a warm area above 50°F [10°C]. Starting the system with low ambient
temperature conditions is more difficult.
6. You may now apply power to the unit. A 3 minute delay on power up is programmed into the GEO
Logic board before the compressor will operate. This delay prevents short cycling of the unit. Note
there may be additional time delays caused by the thermostat.
7. Verify source water flow – specification page.

Open loop systems - manually open water solenoid valve on well system to check flow.

Closed loop systems – operate earth loop pumps to verify flow of antifreeze protected loop
fluid.
The following steps will assure that your system is heating and cooling properly. After the initial time delay is
completed the heat pump is now ready for operation. It is during these steps the information is collected to
complete the
‘Forced Air Heat Pump Operational Statistics’
sheet. This sheet is the top page of this manual.
It should be removed, filled out and kept with the manual for future reference.
1.
Do not
connect refrigerant gauges to this unit unless the data collected indicates there is a problem.
2. Place the thermostat to the “HEAT” position. Turn the thermostat up to activate a 1
st
stage call for heat.

Pumps have an initial purge cycle, then compressor and blower will start.

Check and record source water flow rate in GPM, see specification chart at the beginning of this
manual for minimum water flow requirement.

Check and record antifreeze protection level.
3. After the unit has run for about 3 minutes.

Check and record the source side supply and return water temperatures.

Check and record the supply and return air temperatures.

Check and record the running voltage.

Check and record the total amp draw.

Check and record the compressor amp draw.
4. Raise the thermostat only enough to call 2
nd
stage (if applicable). Again wait 3 minutes.

Check and record the source side supply and return water temperatures.

Check and record the supply and return air temperatures.

Check and record the running voltage.

Check and record the total amp draw.

Check and record the compressor amp draw.
5. Raise the thermostat to call for AUX electric heat. Wait 3 minutes.

Check and record the supply and return air temperatures

Check and record the amp draw on the electric module.
6. Turn the thermostat to the off position. The compressor will shut down in a few seconds. Blower will
continue to the end of the purge cycle.