Circulating Air Source Heat Pump Water Heater
22
6 Debugging, daily operation and maintenance
6.1 Before debugging
（
1
）
Check the unit
1
）
Check whether the appearance of the unit or the pipeline system is damaged during the
transportation.
2
）
Check whether the wiring terminals of the electric parts inside the unit are loose.
3
）
Check whether blades of the unit are interfering with outer case and grille.
4
）
Check whether all temperature sensor is inserted tightly.
5
）
Check whether the electronic expansion valve is installed tightly.
（
2
）
Check the pipeline system
1
）
Check whether all valves needed to be opened are opened and whether all valves needed to be
closed are closed.
2
）
Check whether water tank is full of water and whether the water-level switch is installed correctly.
3
）
Check whether the thermal insulation for the water pipeline system is in good condition.
（
3
）
Check the electrical system.
1
）
Check whether the power supply is consistent with the power required on instruction manual and
nameplate on the unit.
2
）
Check whether the specification of the power cord is consistent with that required on the
instruction manual.
3
）
Check whether the wire connection for the power cord is correct.
4
）
Check whether the power supply and the control wiring are connected correctly and tightly,
whether the grounding is reliable and whether all wiring terminals are fixed tightly.
6.2 Test run
Note: Test run must be conducted when all above checkup items are qualified and guided by
professional persons.
（
1
）
Energize the unit and then turn on the unit. As for the unit adopting three-phase power, if the
power cord is connected reversely, the phase protector will be activated. The main board inside the
electric box is not energized. Therefore, the fan, the compressor and the water pump won’t operate.
Please cut off the power at first, re-connect the three-phase power cord and then energize and turn on
the unit.
（
2
）
During operation, the circulating water pump should operate placidly. If the water pump can’t
operate placidly and the swing fluctuation for the needle pointer of manometer is large, it indicates
there’s still air inside the water system. Please dischar
ge all air and then turn on the unit.
（
3
）
If there’s abnormal sound when the compressor is started up, please stop operation
immediately and check it. When there’s no abnormal sound any more, please resume the operation.
（
4
）
Observe whether the inlet water temperature and the outlet water temperature for the unit are
normal. If the temperature difference between outlet water temperature and inlet water temperatureΔT
＞
5
℃
, it indicates the water flow volume inside the system is small. Please check whether the water
