System Adjustment (It Shall Be Done By Professional); Discharge Water To Water System; Check Before Trial Run; Trial Run - Gree HLR45SNa-M Installation And Operation Manual

9. System Adjustment (it shall be done by professional)

9.1 discharge water to water system

Fill water to the water pipe, meanwhile, conduct auto gas exhaust from exhaust valve till the whole pipe
filled with water, and confirm air in pipe had completely be exhausted.

9.2 Check Before Trial Run

Checking must be done by professional personnel.
9.2.1 Check indoor fan coil
1) Check if power cord connection of all indoor fan coils is correct, and rotation direction of fan motor is
correct.
2) Check if the valve on entrance and exit pipes of fan coil is completely open.
3) Exhaust it from exhaust valve when there is gas inside fan coil.
9.2.2 Check unit
1) Check if the outer appearance of unit and pipeline system is damaged during transportation.
2) Check if wiring terminals for electric components inside unit is loose, if phase sequence is correct.
3) Check if vane of fan motor would touch the outer case and grille when rotating.
4) Check if temperature sensor had inserted well.
9.2.3 Check pipeline system
1) Check if valves at pipeline system had open completely.
2) Check if water had filled the whole pipeline system, if air is exhausted completely.
3) Check if heat preservation to pipeline system is well.

9.3 Trial Run

Trial run can only be conducted after passing all above checking, then do it under the guideline of
professional personnel.
1) Switch on the power supply and turn on the unit. To the unit that uses 3-phase power, when power
sequence is reverse, phase sequence protection works, then fan motor, compressor and water pump will not
operate At that time, cut off power first, exchange the two phases among the 3-phase power, then switch on the
power supply again and turn on the unit.
2) During operation, circle water pump should operates steadily. If it operates unsteadily, and indicator
of pressure meter swings a lot, it means there is air inside water system. At that time, exhaust air completely
through exhaust valve and then turn on the unit. After turning on the unit for 3 minutes, fan and compressor
start automatically.
3) After compressor had started, when abnormal sound is heard, stop the unit immediately and check.
4) When cooling in summer, when temperature of water-out Tout≥15 ℃ , compressor starts; when Tout≤7 ℃ ,
compressor stops, and water pump keeps on running.
5) To heat pump unit, when it is operating heating in winter, and if water-out temperature Tout≤45 ℃ ,
compressor starts running; when Tout≥50 ℃ , compressor stops, and water pump continues running.
6) Obverse if water temperature for in and out is normal, when the temperature difference between
water in and out ∆T>5 ℃ , it means water flow in the system is small, at this time, check that whether there is
blockage in water filter, air in the pipe had not been exhausted, resistance in pipeline system is too great etc.
when ∆T is between 3 ～ 5 ℃ , it can achieve best performance.
7) After trial run, clean the filter on pipeline first, and then the unit can begin normal operation. It is
Household (Townhouse) Central Air Conditioning Unit
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