Gree GRS-CQ12Pd/NhG-K, Owner'S Manual

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Air-to-water Heat Pump
31
MONOBLOC TYPE
Pressure Meter
Vacuum pump
Connection Pipe
Note
when vacuuming is finished, pressure inside the unit should be kept lower than 80Pa for at least 30 minutes to
make sure there is no leak. Either charging valve 1 or charging valve 2 can be used for vacuuming.
Charging : when vacuuming is finished and it is certain that there is no leak, charging can be done.
Leak Detection Methods
：
The following leak detection methods are deemed acceptable for systems containing flammable refrigerants.
Electronic leak detector shall be used to detect flammable refrigerant, but the sensitivity may not be adequate,
or may need re-calibration(Detection equipment shall be calibrated in a refrigerant-free area).
Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used.
Leak detection equipment shall be set at a percentage of the LFL of the refrigerant and shall be calibrated to the
refrigerant employed and the appropriate percentage of gas (25% maximum) is confirmed.
Leak detection fluids are suitable for us with most refrigerant but the use of detergents containing chlorine shall
be avoided as the chlorine may react with the refrigerant and corrode the copper pipe-work.
If a leak is suspected, all naked flames shall be removed / extinguished. If a leakage of refrigerant is found
which requires brazing, all of the refrigerant shall be recovered from the system, or isolated (by means of shut off
valves) in a part of the system remote from the leak. Oxygen free nitrogen (OFN) shall then be purged through the
system both before and during the brazing process.
Note
Before and during operation, use an appropriate refrigerant leak detector to monitor the operation area and
make sure the technicians can be well aware of any potential or actual leakage of inflammable gas. Make sure the
leak detecting device is applicable to inflammable refrigerant. For example, it should be free of sparks, completely
sealed and safe in nature.
16. Installation of Insulated Water Tank
16.1 Installation measure
The insulated water tank should be installed and keep levelly within 5m and vertically within 3m from the indoor
unit. It can be installed in the room.
Standing water tank must be installed vertically with the bottom on the ground, never suspended. Installation
place must be firm enough and the water tank should be fixed on the wall with bolts to avoid vibration, as shown in
the following figure. Weight capacity of water tank during installation should also be considered.