c. The water outlet cant be placed in water in order to drain
smoothly.(As show in Fig.27)
VACUUM PUMPING AND LEAK
DETECTION
1. Use Vacuum Pump
• Remove valve caps from liquid valve and gas valve and form
the nut of refrigerant charging vent.
• Connect charging hose of piezometer to the refrigerant
charging vent of the gas valve. Then connect the other
charging hose to the vacuum pump.
• Open piezometer completely and operate unit for 10-15
minutes in order to check pressure level of piezometer. Should
remain at -0.1MPa.
• Close vacuum pump and keep closed for 1-2 minutes to verify
pressure of piezometer remains at -0.1MPa. If the pressure
decreases, there MAY be leakage.
• Remove piezometer, completely open both the valve core of
the liquid valve and gas valve with an inner hexagon spanner.
• Tighten screw caps of valves and refrigerant charging vent
(Shown in Figure #28 below).
2. Leakage Detection
• Check for leaks using leak detector.
• Use soapy water if leak detector is unavailable. Apply soapy
water to the area in question. Leave soap & water solution on
for 3 minutes. Watch for air bubbles coming from solution to
detect leak.
59
Installation and Maintenance
Service Manual
(3) The water outlet cant be placed in water in order to drain
smoothly.(As show in Fig.27)
Liquid valve
Gas valve
Refrigerant charging
vent
Nut of refrigerant
Charging vent
Vacuum pump
Piezometer
Valve cap
Lo
Hi
Inner hexagon
spanner
Open
Close
The drain hose can't be fluctuant
The drain hose
can't be fluctuant
The water
outlet can't be
fluctuant
The water outlet
can't be placed
in water
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 -14.5ISP.
(4) Close the vacuum pump and maintain this status for 1-2min
to check if the pressure of piezometer remains in -14.5ISP. 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)
1. Check after Installation
Check according to the following requirement after finishing
installation.
2. Test Operation
(1) Preparation of test operation
● The client approves the air conditioner installation.
● Specify the important notes for air conditioner to the client.
(2) Method of test operation
● Put through the power, press ON/OFF button on the remote
controller to start operation.
● Press MODE button to select AUTO, COOL, DRY, FAN and
HEAT to check whether the operation is normal or not.
● If the ambient temperature is lower than 16
℃
, the air
conditioner cant start cooling.
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, theres a leakage.
8.7 Vacuum Pumping and Leak Detection
8.8 Check after Installation and Test
Operation
Fig.26
Fig.27
Fig.28
NO.
Items to be checked
Possible malfunction
1
Has the unit been
installed firmly?
The unit may drop, shake or
emit noise.
2
Have you done the
refrigerant leakage test?
It may cause insufficient cooling
(heating) capacity.
3
Is heat insulation of
pipeline sufficient?
It may cause condensation and
water dripping.
4
Is water drained well?
It may cause condensation and
water dripping.
5
Is the voltage of power
supply according to the
voltage marked on the
nameplate?
It may cause malfunction or
damage the parts.
6
Is electric wiring and
pipeline installed
correctly?
It may cause malfunction or
damage the parts.
7
Is the unit grounded
securely?
It may cause electric leakage.
8
Does the power cord
follow the specification?
It may cause malfunction or
damage the parts.
9
Is there any obstruction
in air inlet and air outlet?
It may cause insufficient cooling
(heating) capacity.
10
The dust and
sundries caused
during installation are
removed?
It may cause malfunction or
damaging the parts.
11
The gas valve and liquid
valve of connection pipe
are open completely?
It may cause insufficient cooling
(heating) capacity.
12
Is the inlet and outlet
of piping hole been
covered?
It may cause insufficient cooling
(heating) capacity or waster
eletricity.
59
Installation and Maintenance
Service Manual
(3) The water outlet cant be placed in water in order to drain
smoothly.(As show in Fig.27)
Liquid valve
Gas valve
Refrigerant charging
vent
Nut of refrigerant
Charging vent
Vacuum pump
Piezometer
Valve cap
Lo
Hi
Inner hexagon
spanner
Open
Close
The drain hose can't be fluctuant
The drain hose
can't be fluctuant
The water
outlet can't be
fluctuant
The water outlet
can't be placed
in water
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 -14.5ISP.
(4) Close the vacuum pump and maintain this status for 1-2min
to check if the pressure of piezometer remains in -14.5ISP. 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)
1. Check after Installation
Check according to the following requirement after finishing
installation.
2. Test Operation
(1) Preparation of test operation
● The client approves the air conditioner installation.
● Specify the important notes for air conditioner to the client.
(2) Method of test operation
● Put through the power, press ON/OFF button on the remote
controller to start operation.
● Press MODE button to select AUTO, COOL, DRY, FAN and
HEAT to check whether the operation is normal or not.
● If the ambient temperature is lower than 16
℃
, the air
conditioner cant start cooling.
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, theres a leakage.
8.7 Vacuum Pumping and Leak Detection
8.8 Check after Installation and Test
Operation
Fig.26
Fig.27
Fig.28
NO.
Items to be checked
Possible malfunction
1
Has the unit been
installed firmly?
The unit may drop, shake or
emit noise.
2
Have you done the
refrigerant leakage test?
It may cause insufficient cooling
(heating) capacity.
3
Is heat insulation of
pipeline sufficient?
It may cause condensation and
water dripping.
4
Is water drained well?
It may cause condensation and
water dripping.
5
Is the voltage of power
supply according to the
voltage marked on the
nameplate?
It may cause malfunction or
damage the parts.
6
Is electric wiring and
pipeline installed
correctly?
It may cause malfunction or
damage the parts.
7
Is the unit grounded
securely?
It may cause electric leakage.
8
Does the power cord
follow the specification?
It may cause malfunction or
damage the parts.
9
Is there any obstruction
in air inlet and air outlet?
It may cause insufficient cooling
(heating) capacity.
10
The dust and
sundries caused
during installation are
removed?
It may cause malfunction or
damaging the parts.
11
The gas valve and liquid
valve of connection pipe
are open completely?
It may cause insufficient cooling
(heating) capacity.
12
Is the inlet and outlet
of piping hole been
covered?
It may cause insufficient cooling
(heating) capacity or waster
eletricity.
CHECK AFTER INSTALLATION AND
TEST OPERATION
1. Check after Installation
Use chart below
No. Check Following
Possible Malfunction
1
Was unit installed firmly/
securely?
Unit may shake or emit
rattling noise.
2
Was refrigerant leakage
test performed?
This may cause insufficient
cooling heating) capacity.
3
Is heat insulation of
pipeline sufficient?
May cause condensation
and water leakage.
4
Does water drain well?
May cause leakage.
5
Does voltage of power
supply match voltage
listed on nameplate?
Malfunction and damage to
the unit may result.
6
Was electric wiring
and pipeline installed
correctly?
Malfunction and damage to
the unit may result.
7
Was the unit properly
grounded?
May experience electric
leakage.
8
Does the power cord
meet specification?
Malfunction and damage to
the unit may result.
9
Are there obstructions in
the air inlet/outlet?
This may cause insufficient
cooling heating) capacity.
10 Was unit free of dust and
packing material prior to
installation?
Malfunction and damage to
the unit may result.
11
Are both the gas valve
and liquid valve open
completely?
This may cause insufficient
cooling heating) capacity.
12 Have both the inlet and
outlet piping hole been
covered?
This may cause insufficient
cooling heating) capacity.
May waste electricity.
2. Test Operation
• Prep test operation
o Client approves air conditioner installation.
o Specify the important notes of the air conditioner to the
client.
• Method of test
o Turn on power. Press ON/OFF button on the remote
controller to start operation.
o Press MODE button to select AUTO, COOL, DRY, FAN
and HEAT to check if the operation(s) is functioning.
o If the ambient temperature is lower than 60.8OºF – the
air conditioner cannot begin the cooling cycle.
