Nordic R-09, Installation And Service Manual, Page: 28 / 60

11-May-2021 Page 28 002512MAN-01
Unit Startup
The unit is now ready to be started. The steps below outline the procedure for starting the unit and verifying proper operation of
the unit. It is recommended that safety glasses be worn during the following procedures.
Preparation:
1. Remove the caps from the service ports and connect a refrigeration manifold set to the unit.
2. Turn the power on to the heat pump and set the thermostat to OFF. Set up the thermostat as per the instructions provided
with it so that it will function properly with the heat pump system (set for system type: heat pump). The O
signal should be set to active in cooling mode.
3. Measure the following voltages on the compressor contactor and record them on the startup sheet: L1-L2, L2-L3, L1-L3.
Heating Mode:
1. Set the thermostat to heating mode and adjust the setpoint to activate heat pump. The fan should slowly ramp up
to speed after the time delay of the thermostat expires (if applicable) and the compressor will start (allow 30-60 seconds for
the water valve to open for ground water systems)
2. Check the refrigeration gauges. The suction and discharge pressures will depend on the loop temperatures, but they should
be about 90-110PSIG and 260-360PSIG respectively for a typical start-up.
3. Monitoring the refrigeration gauges while the unit runs. Record the following after 10 minutes of runtime:
1. Suction pressure
2. Discharge pressure
3. Duct Return temperature (poke a small hole in the flex collar and insert probe in airstream)
4. Duct Supply temperature (poke a small hole in the flex collar and insert probe in airstream)
5. Duct Delta T (should be between 22-32°F, 12-18°C )
6. Outdoor Loop In (Supply In) temperature
7. Outdoor Loop Out (Supply Out) temperature
8. Outdoor Delta T (should be between 5-8°F, 3-4°C )
9. Outdoor flow (if available)
10. Compressor L1(C) current (black wire, place meter between electrical box and compressor)
4. Adjust the thermostat setpoint to the desired room temperature and let the unit run through a cycle. Record the setpoint,
suction pressure, and discharge pressure when the unit shuts off.
Cooling Mode:
1. Set the thermostat to cooling mode and adjust the setpoint to activate heat pump.
2. Monitoring the refrigeration gauges while the unit runs. Record the following after 10 minutes of runtime:
1. Suction pressure
2. Discharge pressure
3. Duct Return temperature
4. Duct Supply Out temperature
5. Duct Delta T
6. Outdoor Loop In (Supply In) temperature
7. Outdoor Loop Out (Supply Out) temperature
8. Outdoor Delta T
3. Adjust the thermostat setpoint to the desired room temperature if possible, otherwise set it just low enough to allow the unit
to run (i.e. 1°F / 0.5°C less than room temperature) and let the unit run through a cycle. Record the thermostat setpoint,
suction pressure and discharge pressure when the unit shuts off.
Final Inspection:
1. Turn the power off to the unit (and plenum heater if installed) and remove all test equipment.
2. Install the electrical box cover and the access panel on the heat pump. Install the service port caps securely to prevent
refrigerant loss. Install the electrical cover on the plenum heater if applicable.
3. Do a final check for leaks in the ground water / ground loop system and ensure the area is clean.
4. Turn the power on to the unit and the plenum heater if installed. Set the thermostat to the final settings.
Startup Record:
1. The installer shall sign and date the Startup Record and have the homeowner sign as well. The installer shall leave the Startup
Record with the homeowner, retain a copy for filing and send a copy to Maritime Geothermal Ltd. for warranty registration.