Maritime Geothermal TF-45, Installation And Service Manual

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Page 44 001223MAN-05 1-Jul-2017
Unit Startup (Hydronic)
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 controlled by an aquastat. 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 all controls (including all zone thermostats) to OFF.
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 heating aquastat setpoints to activate Stage 1 and Stage 2. The compressor will start (allow 30-60 seconds for the
water valve to open for ground water systems) as well as the circulator pumps.
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. Indoor Loop In (Hot In) temperature
4. Indoor Loop Out (Hot Out) temperature
5. Indoor Delta T (should be between 8-12°F, 4-6°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 aquastat setpoint to the desired buffer tank temperature and let the unit run through a cycle. Record the setpoint,
suction, and discharge pressures when the unit shuts off.
5. Proceed to Final Inspection if the desuperheater has already been tested during the Air Startup.
6. Open a zone (or zones) and let the tank cool down until Stage 2. is activated. Close the zone(s) again.
7. Turn the power off to the unit. Connect the brown wire with the blue insulated terminal to the compressor contactor as shown in
the electrical box diagram. Turn the DHW Switch in the unit post on. Turn the power to the unit on.
8. Verify the DHW IN and DHW OUT temperatures (if applicable) by hand (caution: pipes get hot). If the DHW OUT line does
not become hotter than the DHW IN line the circulator is air locked. Bleed the air from the system and check the
temperature differential again to ensure there is flow from the circulator.
Final Inspection:
1. Turn the power off to the unit 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.
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. Set the aquastat to the final settings and record the values.
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.