Air-to-water Heat Pump
30
MONOBLOC
TYPE
Discharging: remove metal sheets of the outer casing, connect a hose to the charging valve and then discharge
refrigerant.
Charging valve 1
Charging valve 2
Notes
(a) Discharge is allowed unless the unit has been stopped. (Cut o the power and repower it 1 minutes later)
(b) Protective measures should be taken during discharging to avoid frost bites.
(c) When discharging is nished, if vacuuming cannot be done immediately, remove the hose to avoid air or
foreign matters entering the unit.
(d) Vacuuming: when discharging is finished, use hoses to connect the charging valve, manometer and
vacuum pump to vacuum the unit.
Pressure Meter
Vacuum pump
Connection Pipe
Note
When vacuuming is nished, 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 nished and it is certain that there is no leak, charging can be done.
Leak Detection Methods
：
(1) The following leak detection methods are deemed acceptable for systems containing flammable
refrigerants.
(2) 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).
(3) Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used.
(4) 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 conrmed.
(5) Leak detection uids 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.
To Next Page
Loading...
