Equipment Start-Up Process
Check the following before power is applied to the equipment
Caution: Do not start-up the unit until the new structure is ready to be occupied
Electrical:
o Geothermal unit high voltage wiring
is installed correctly
o Geothermal unit high voltage wiring
and breaker are the correct size
o Auxiliary electric heaters are wired
and installed correctly
o Circulating pumps are wired and
fused (if necessary) correctly
Desuperheater pump is NOT wired,
unless piping is complete and all air
is purged
o Low voltage wiring is correct and
completely installed
Plumbing:
o Pipe and pump sizes are correct
o Air is purged from all lines
o Antifreeze is installed
o All valves are open, including those
on the flow center
o Condensate is trapped and piped
to the drain
Ductwork:
o Filter is installed and clean
o Packaging is removed
from the blower assembly
o Blower turns freely
o Canvas connections
installed on supply plenum
& return drop
Equipment Start-Up:
1. Energize geothermal unit with high voltage.
2. Set the thermostat to “Heat” or “Cool.” Adjust set point to energize the unit.
System will energize after delays expire (typically a five minute delay).
3. Check water flow with a flow meter (non-pressurized) or pressure drop
conversion (pressurized). Pressure drop tables must be used to convert the
pressure drop to GPM. The pressure drop can be obtained by checking
water pressure in and water pressure out at the P/T ports. ON UNITS WITH
INTERNAL LOOP CIRCULATION PUMPS, USE THE INTERNAL SOURCE SIDE INPUT PT
PORT. DO NOT USE ANY EXTERNAL SOURCE SIDE INPUT PT PORT. Output test
readings may be taken at any external PT port.
4. Check the geothermal unit’s electrical readings listed in the Unit Electrical
Data table.
5. Check the source water temperature in and out at the P/T ports (use
insertion probe). Allow 10 minutes of operation before recording
temperature drop.
6. Calculate the heat of extraction or heat of rejection.
7. Check the temperature difference of the load coax (water-to-water) or air
coil (water-to-air). P/T ports are recommended for use on the load side, but
the line temperatures can be used to check the temperature difference.
8. Change the mode of the thermostat and adjust the set point to energize the
unit. Check the data in opposite mode as the previous tests. Amp draws as
well as temperature differences and flow rate should be recorded.
9. Check auxiliary heat operation by adjusting the thermostat set point 5°F
above the room temperature in “Heat” mode or set thermostat to
“Emergency." Record voltage, amperage, and air temperature difference.
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