Vacuum Pumping And Leak Detection - Gree GWH07QA-K6DNC4A Service Manual

5. Connect Outdoor Electric Wire
(1) Remove the wire clip; connect the power connection wire and
signal control wire (only for cooling and heating unit) to the wiring
terminal according to the color; fix them with screws.(As show in
Fig.23)
GWH07QA-K6DNC4A/O
GWH09AGA-K6DNA1A/O
GWH12AGB-K6DNA1A/O
N(1) 2
N
blue black
Indoor unit connection
GWH18QD-K6DNA1D/O
GWH24QE-K6DNA1E/O
N(1)
yellow-
blue black
Fig.23
green
Indoor unit connection
Note: the wiring connect is for reference only,please refer to the
actual one.
(2) Fix the power connection wire and signal control wire with wire
clip (only for cooling and heating unit).
Note:
(1) After tightening the screw, pull the power cord slightly to check
if it is firm.
(2) Never cut the power connection wire to prolong or shorten the
distance.
6. Neaten the Pipes
(1) The pipes should be placed along the wall, bent reasonably and
hidden possibly. Min. semidiameter of bending the pipe is 10cm.
(2) If the outdoor unit is higher than the wall hole, you must set
a U-shaped curve in the pipe before pipe goes into the room, in
order to prevent rain from getting into the room.(As show in Fig.24)
Wall
U-shaped curve
Drain hose
Fig.24
Note:
(1) The through-wall height of drain hose shouldnt be higher than
the outlet pipe hole of indoor unit.(As show in Fig.25)
(2) Slant the drain hose slightly downwards. The drain hose cant
be curved, raised and fluctuant, etc.(As show in Fig.26)
(3) The water outlet cant be placed in water in order to drain
smoothly.(As show in Fig.27)
96
GWH09AFC-K6DNA2F/O
GWH12AFC-K6DNA2F/O
GWH18AFD-K6DNA2I/O
GWH18ALD-K6DNA1A/O
3
GWH24ALD-K6DNA1B/O
GWH24AFE-K6DNA2I/O
L
yellow-green
N(1) 2 L(3)
brown(black)
L
blue
N
yellow- yellow-
brown brown
POWER
green
green blue black brown blue
(black)
N
Indoor unit connection
2 3 L N
brown blue yellow-
(black) green
brown
L N
POWER
The drain hose
can't raise
upwards.
Fig.25
The drain hose can't be fluctuant
The drain
hose can't
be fluctuant
Fig.26
yellow-
green
L
POWER

8.7 Vacuum Pumping and Leak Detection

1. Use Vacuum Pump
(1) Remove the valve caps on the liquid valve and gas valve and
the nut of refrigerant charging vent.
(2) Connect the charging hose of piezometer to the refrigerant
charging vent of gas valve and then connect the other charging
hose to the vacuum pump.
(3) Open the piezometer completely and operate for 10-15min to
check if the pressure of piezometer remains in -0.1MPa.
(4) Close the vacuum pump and maintain this status for 1-2min
to check if the pressure of piezometer remains in -0.1MPa. If the
pressure decreases, there may be leakage.
(5) Remove the piezometer, open the valve core of liquid valve
and gas valve completely with inner hexagon spanner.
(6) Tighten the screw caps of valves and refrigerant charging
vent.(As show in Fig.28)
Liquid valve
Gas valve
Refrigerant charging
vent
Nut of refrigerant
Charging vent
2. Leakage Detection
(1) With leakage detector:
Check if there is leakage with leakage detector.
(2) With soap water:
If leakage detector is not available, please use soap water for
leakage detection. Apply soap water at the suspected position and
keep the soap water for more than 3min. If there are air bubbles
coming out of this position, there's a leakage.
The water outlet
can't be placed
in water
The water
outlet can't
be fluctuant
Fig.27
Piezometer
Valve cap
Vacuum pump
Inner hexagon
spanner
Close
Open
Fig.28
Installation and Maintenance
Service Manual
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