No.
0010571036
C
Please read this manual carefully before using.
Please keep this manual carefully and safely.
Ceiling Concealed Duct type
INSTALLATION MANUAL
CONTENTS
Safety cautions
Choose installation location
Indoor unit installation
Refrigerant piping
Electrical wiring
Application control
Trial operation
Troubleshooting
1
2
3-6
7-8
9-11
12-13
14
15
MRV Intelligent Network
Indoor Air Conditioning
Caution
Auto Restart function for C-MRV models
Haier Auto Restart function: when the unit power drops down suddenly, the unit
microprocessor will store the previous working condition and when the power is on again,
the unit will run as this memory.
Auto Restart function is designed basically on the MRV whole system, but it is suitable
for each indoor unit individually.
If some of indoor units power cut down, but the outdoor unit and the other indoor units
still work, maybe problems will happen such as freezing at cooling mode and overload
protection at heating mode on those indoor units without power.
Reason
When one or some indoor units power drops down and the other indoor units are still
work, the indoor units without the power, will keep the previous working condition before
the power is off. And expansion valve keeps open at a kind of opening rate condition as
the previous requirement, so there is refrigerant flowing in the exchanger, but the indoor
fan stops working. If the units work at cooling mode, the indoor units without the power
will maybe make freezing. If the unit works at heating mode, maybe the outdoor unit
compressor will stop because of the pressure or temperature protection. This is our design
basically on Auto Restart function currently.
Haier, Herewith, solemnly informs our customers, installers, distributors, etc. when making
installation, please make sure when the power is shut down whether artificially or
accidentally, the whole system including outdoor unit and all the indoor units must
be off. If you do not make the installation as our indication, Haier will not be responsible
for any problem resulting from this.
Interpretation of four symbols:
:
WARNING : A potentially hazardous situation, which, if not avoided,could result
in serious injury or death
: Operation so marked must be avoided at all cost, or serious damage to
equipment or fatal injury to operator may result.
CAUTION : A potentially hazardous situation, which, if not avoided, may result in
minor or moderate injury or damage to the equipment
Operation so marked is not allowed, or serious damage to equipment
or fatal injury to operator may result.
The following instructions must be followed to avoid potential hazards.
Written instructions should be available at hand any time for convenient reference.
This operation manual should always be attached to this appliance even if the appliance is
transferred.
1
Safety cautions
Entrusted installation
Installation should be entrusted with after-sale
servicemen. Self-installation is likely to cause
water leakage, shock and fire, etc.
Installation should be done according to this
installation manual. Inappropriate installation
may lead to water leakage, shock and fire, etc.
Connection of the earth wire
The earth wire should not be connected to
gas pipes, water pipes, lightning rods or
telephone wires. Poor earth may lead to
shocks.
After-sale servicemen should take measures
to avoid refrigerant leakage.
Refrigerant leak may cause anoxia when
a certain density is reached. If the room
is small, make sure to have sound safety
measures to avoid anoxia accidents.
Installation site
The site must be firm enough to withstand the
weight of the air conditioner to prevent
falling.
During installation, if refrigerant leakage
occurs, ventilation measures must be taken.
When refrigerant meets with fire, hazardous
gas will be produced.
After installation, make sure that there is
no refrigerant leakage.
Refrigerant, if meeting with heaters and
stoves, etc in the room, may produce
hazardous gas.
The installation of the electric part should
be conducted by qualified professionals
and done according to the installation
manual. Special return circuit must be used.
Insufficient capacity return circuit and
inappropriate installation may lead to fire
accidents.
Specific cables should be used for the
wiring. To avoid external tension of the
cables, the terminals should be firmly fixed.
Inappropriate connection and fixture may
lead to fire accidents.
Electric leak breaker should be installed.
Without it, shock accidents may occur.
Do not install at places where inflammable gas
leak may occur.
Gas leakage may lead to fire accident.
In order to discharge the condensed water,
the installation of the drainpipe should be
done in accordance with the manual
instructions. The drainpipe should be treated
for heat isolation. Inappropriate treatment
may lead to water leakage in the room.
Test run
After indoor units are installed,all
cassettes hinded models should be
tested.when the units are confirmed
to be normal,other fitments can be
installed.
Caution
!
Warning
!
!
!
Choose installation location
The indoor unit shall be installed at locations where cold and hot air could evenly circulated.
The following locations should be avoided:
Places with rich saline matters (seaside regions).
Places with plenty of gas sulfides (mainly in warm spring areas where the copper tube and
braze weld is prone to corrosion).
Locations with much oil (including mechanical oil) and steam.
Locations using organic solvents.
Places where there are machines generating HF electromagnetic waves.
Positions adjacent to door or window in contact with high-humidity external air. (Easy to
generate dew).
Locations frequently using special aerosols.
Indoor unit
1. Select suitable places the outlet air can be sent to the
entire room, and convenient to lay out the connection
pipe, connection wire and the drainage pipe to outdoor.
2. The ceiling structure must be strong enough to support
the unit weight.
3. The connecting pipe, drain pipe and connection wire
shall be able to go though the building wall to connect
between the indoor and outdoor units.
4. The connecting pipe between the indoor and outdoor units as well as the drain pipe shall be
as short as possible. (See Figure 1)
5. If its necessary to adjust the filling amount of the refrigerant, please refer to the installation
manual attached with the outdoor unit.
6. The connecting flange should be provided by the user himself.
7. The indoor unit has two water outlets one of which is obstructed at the factory (with a rubber
cap). Only the outlet not obstructed (liquid inlet and outlet side) will be generally used during
installation. If applicable, both the outlets should be used together.
Important
An access port must be provided during installation of indoor unit for maintenance.
Fig 1
Please do not install the unit in places where flammable gases may be leaked. In case
that gas is leaked and accumulated around the unit, it may cause dangers of fire etc.
! Caution
When install the AE072~242FEAHA/AE072~242FEBIA units, need connect the
corresponding PMV Box to the liquid pipe and fasten the PMV Box,When the distance
between PMV Box and indoor unit longer than 1m,please use 8m signal wires (accessory).
15
Troubleshooting
When
failure
occurs, use the remote controller to display the corresponding
failure
code.
Confirm and verify
1. Press the " Check " switch on the remote controller for 1-2 seconds, "Check " will appear,
and the unit number and the
failure
code will be displayed on the remote controller.
2. The displayed number is the
failure
unit number.
3. Example is listed as follows:
Check
Normal
:
One
failure:
Two
failure:
OC
14
OC
OC
The signs will be displayed for
a very short time. If not seen
clearly, press the " Check "
switch again.
All stop
Running continues
All stop
93/94
11
12
14
17
18
1C
1d
1F
21
b5
b6
97
98
99
Indoor heat exchanger & sensor circuit (TC1/TC2), including indoor heat
exchanger & sensor (TC1/TC2) and indoor PC board
Indoor fan system, including revolution detecting circuit, indoor fan motor
and indoor PC board
Outdoor defrosting sensor circuit, including outdoor defrosting sensor
(TE) and outdoor converter PC board
Compressor system, including compressor lock and phase absence
External abnormal input, including external machine and indoor PC board
External interlocked input, including external machine and indoor PC board
Connecting wire, indoor PC board and wire controller
Setting of indoor unit number and wire controller
Current detecting circuit, including power Pressure and overload of
refrigerant circulation
Center controlled communication circuit, including communication wire,
centralized controller, indoor power and indoor PC board
Center controlled address setting, including address setting (SW02),
central wire controller and indoor PC board
Fault codes and failure place
Fault code
Reacons
Phenomenon
Running continues
0C
Room-temperature sensor(TA)circuit,including Room-temperature
sensor(TA),indoor PC board.
All stop
All stop
All stop
All stop
All stop
All stop
Running continues
All stop
Stops
Runs
Running continues
Running continues
Running continues
2
Outdoor unit, including outdoor interface control (I/F) PC board
Converter overcurrent protection circuit, including G-Tr, outdoor PC board,
converter wiring and compressor
Current sensor circuit, including current detecting circuit and outdoor
converter PC board
Indoor unit, including PC board (EEPROM and peripheral circuit)
High pressure switch circuit, including high pressure switch and overload
of refrigerant circulation
14
Trial operation
Before the unit is turned on, test the resistance between the power block terminal (L, N terminals) and
the earth. If it is below 1M , it can't allowed running.
Turn on the outdoor unit. To protect the compressor during start-up, it should be switched on 12 hours
before the trial run.
Never operate the electromagnetic contactor manually for forced trial run.
Before operation
Trial operationing method
(it is dangerous when the protection device does not work.)
Refer to the service manual for the running procedure.
When the unit fails to start under room temperature, try forced trial run by the following steps.
Cooling
Heating
Set the running mode to "Cooling"
Press the ON/OFF button till an "L" blinks at the "Setting temp" area of the wire controller LCD
and "Auto" is displayed at the fan speed area. Now the unit enters into cooling trial run.
Set the running mode to "Heating"
Press the ON/OFF button till a blinking "H" and an "Auto" sign appear on the wire controller. Now
the unit enters into heating trial run.
During forced trial run, working modes cannot be changed through the remote controller.
After trial run, press the ON/OFF button to stop the unit.
Indoor unit installation
The unit shall be installed according to the
specifications to resist to strong wind and earthquake.
Improper installation may cause dangers of unit
falling down etc.
After selecting the unit installation location, proceed the following steps:
1. Drill a hole in the wall and insert the connecting pipe and wire through a PVC wall-through tube
purchased locally. The wall hole shall be with a outward down slope of at least 1/100. (See
Figure 2)
2. Before drilling check that there is no pipe or reinforcing bar just behind the drilling position.
Drilling shall avoid at positions with electric wire or pipe.
3. Mount the unit on a strong and horizontal building roof. If the base is not
firm, it will cause noise, vibration or leakage.
4. Support the unit firmly.
5. Change the form of the connection pipe, connection wire and
drain pipe so that they can go through the wall hole easily.
The unit shall be installed at locations enough
to support the unit. If not, the air conditioner
may fall down and cause personal injury.
! Warning
AE242FEBHA
AE072FEBHA AE142FEBHA
AE092FEBHA AE162FEBHA
AE122FEBHA AE182FEBHA
Installation dimension: (Unit: mm)
h
a
i
e
f
g
b
c
d
Fig 2
During the installation,please make sure PMV
Box should be put on in horizontal or side A
upside vertical.(See the figure)
PMV Box
TYPE
AE072FEAHA
a b c d e f g h i
765 900 450 225 80 225 123 22 100
500 830 450 225 80 225 123 22 100
AE092FEAHA
900 450 225 80 225 123 22 100
AE122FEAHA
1065 1200 450 225 53 225 112 22 100
AE162FEAHA
1065 1200 450 225 53 225 112 22 100
AE182FEAHA
1215 1350 450 225 53 225 112 22 100
AE242FEAHA
765
AE072FEBIA,
AE092FEBIA,
AE122FEBIA,
AE162FEBIA,
AE182FEBIA,
AE242FEBIA,
3
Each of the air sending duct and air return duct shall be fixed on the prefabricated panel of the floor
by the iron bracket.
The recommended distance between the edge of the air return duct and the wall is over 150mm.
The gradient of the condensate water pipe shall keep over 1%.
The condensate water pipe shall be thermal insulated.
When installing the ceiling Concealed type indoor unit, the air return duct must be designed and
installed (as figure shown).
The sketch map of short duct
Air distributary
Air return duct
Air return blind
Suspending hook
Drain pipe
Transition duct
Air out duct
Note: When connecting the long ducts, use the middle static terminals, which color is red.
The sketch map of long duct
Tie-in of air
distributary
L
Ceiling
Air sending
Air returned
Air return box
Air conditioner
Air outlet
Top surface of the building installed
Air sending
Air outlet grille
Air return box
Air returned
Air conditioner
M8 wide expansion bolt
M8 suspender screw
M8 wide lock washer
M8 screw nut
Air conditioner
Note: When connecting the short ducts, use the low static terminals, which color is white.
The distance L from the air outlet of the duct to the air outlet of the sir conditioner shall
be no more than 1 m.
The distance L from the air outlet of the duct to the air outlet of the sir conditioner shall
be no more than 5 m.
If the remote controller is not connected or the remote controller
will not be used to change the group setting, the switch SW02
on the indoor control board can be used to set the group number.
Important:Switch on the centralized controller
or press the reset button of the centralized
controller after the group number is changed.
(1) Turn off the power
(2) Set SW02 7 to ON. (Group number setting by the remote
controller is prohibited.)
(3) Through setting SW02 1 ~ 6 , the corresponding group
number will be set.
Group number setting (setting of SW02)
1
2 345 6
Network address settings (SW02 setting)
:ON x:OFF(OFF for 5 and 6)
01
x x x x x x
02
x x x x x
03
x x x x
x
04
x x x x
05
x x x
x
x
06
x x x
x
07
x x
x
x
08
x x x
09
x x
xx x
10
x x
x
x
11
x x
x
x
12
x x
x
13
x x
x
x
14
x x
x
15
x x
x
16
x x
If the heating effect is not satisfactory due to reasons of installation location and room
structure, etc, the heating temperature can be corrected and heating efficiency can be improved
through the following measures.
Adjust the TA corrections by the
following table (SW03 1.2).
To improve warm air circulation, other
ventilation appliances may be used.
Heating temp compensation setting (setting of SW03)
Emergency switch (setting of SW04)
After installation, set the emergency switch to ìONî
for trial run of the drain pump and the indoor fan.
Indoor unit capacity (setting of SW05)
The capacity has been set in the factory. If the circuit board
is changed, it can be set according to the following table.
Setting of
horsepower
1
2
3
4
Set capacity
(SW05 setting)
SW05
setting of
horsepower
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
0.2HP
0.8HP
0.5HP
1.0HP
1.25HP
1.5HP
1.7HP
2.0HP
x
x
x
x
x
x
x
x
x
x
x
x
2.5HP
3.0HP
3.2HP
4.0HP
5.0HP
6.0HP
8.0HP
10.0HP
:ON x:OFF
setting
(Only 1 and 2
Factory setting
SW03
4 6
ON ON ON
1 1 12 2 23 3 3
2
Indoor unit installation
4
13
Application control
The table on the right gives the corresponding network address
settings.
Group number setting by the
remote controller is prohibited
ON
OFF
1 2 3 4 5 6 7
ON
Group number setting
ON
1 2 3 4 5 6 7
An example
Group number16
Toggle SW02
ON
OFF
Set capacitySW05
Choice of unit
Installation of indoor unit duct
1. Installation of air sending duct
This unit uses rounded duct, the diameter of the duct is 180mm.
The rounded duct needs to add a transition duct to connect with the air-sending duct
of indoor unit, then connect with respective separator. As Fig. 1 shown, all the fan speed
of any of the separator's air outlet shall be adjusted approximately the same to meet
the requirement for the room air conditioner.
2. Installation of air return duct
Use rivet to connect the air return duct on the air return inlet of the indoor unit, then
connect the other end with the air return blind. As Fig. 2 shown.
Indoor unit
Soft connection
or static box
Transition duct
Rounded duct
Unit: mm
3. Thermal insulation of duct
Air-sending duct and air return duct shall be thermally insulated. First stick the gluey
nail on the duct, then attach the heat preservation cotton with a layer of tinfoil paper
and use the gluey nail cap to fix. Finally use the tinfoil adhesive tape to seal the
connected part. As Fig. 3 shown.
Fig. 1
Fig. 2
Fig. 3
Air distributary
Tie-in of air
distributary
Indoor unit
rivet
Air return duct
Air return blind
gluey
nail
gluey
nail cap
adhesive tape
tinfoil
heat preservation
cotton
Indoor unit installation
Group control method
One remote controller can control as many as 16 indoor units.
Please refer to the item " Electric wiring" for wire connection between indoor and outdoor units.
Wire connection between the remote controller and indoor units shall be performed in the
following sequence.
(1)It's necessary to operate the unit number set switch on indoor PC board to set the first unit
as " 1 " , the second unit as " 2" ...... (the indoor unit connecting the remote controller shall
be set as No.1unit).No.1 unit is the master and others are slaves.
(2)Connect terminals A, B and C of the remote controller with those on the indoor unit
(the numbers shall be matched).
(3)Connect terminals B and C on No.1 indoor unit with terminals B and C on No.2 indoor
B and C (the numbers shall be matched).
(4)Connect terminals B and C on No.2 indoor unit with terminals B and C on No.3 indoor unit
(the numbers shall be matched).
(5)Repeat in the same way until terminals B and C of No.16 unit have been connected (a maximum
of 16 units could be connected).
(6)To avoid fault due to wrong wiring, the short connection wire at terminal CN12 on control
board of No.2 - No.16 indoor units shall be detached.
When several units are controlled by one remote controller, trial run can be done for each unit
by pressing " Setting temp" button. Each time the " Setting temp" button is pressed, the address
of the unit will be changed and displayed and trial run will be triggered. (If there is no display
of the unit number, the trial run will be for all the units.)
Requirement
The remote controller connecting wires between indoor units shall be of an cross-sectional
area of more than 1mm2 and a maximum length of 500m (the length form remote controller
to No.16 unit).
Application control
CN02 CN12 CN01
Indoor control board
A
B C
A
B C
A
B C
A
B C
remote controller
indoor unit
(unit 1)
(unit2-16)
indoor unit
indoor unit
12
D
(setting of SW01)
5
Installing the suspension screw:
Use M8 or M10 suspension screws (4,prepared in the field)(when the suspension screw
height exceeds 0.9m,M10 size is the only choice).These screws shall be installed as
follows with space adapting to air conditioner overall dimensions according to the original
building structures.
Wooden structure
A square wood shall be supported by the beams and then set the suspension screws.
New concrete slab
To set with embedded parts,foundation bolts etc.
Original concrete slad
Use hole hinge,hole plunger or hole bolt.
Steel reinforcement structure
Use steel angle or new support steel angle directly.
Hanging of the indoor unit
Fasten the nut on the suspension screw and then hang the suspension screw in the T
slot of the suspension part of the unit.
Aided with a level meter,adjust level of the unit within 5mm
2
Hanging bolt
Suspension screw
Support steel angle
Guide plate embedded part
Knife embedded part
Foundation bolt
Pipe suspension foundation bolt
Iron reinforcement
Square wood
Beam
Suspension screw
specially used by the power
(centralized controller)
P
Q
Y
X
A
B
C
L
N
outdoor unit
outdoor power
leak breaker
manual switch
communication wire
centralized control
signal wire
remote controller
shielding layer should be connected together
junction box
indoor unit
(remote control grouped control)
centralized controller
indoor unit
earth
indoor power
(shielding layer as isolation)
(shielding layer as isolation)
(shielding layer as isolation)
communication wire
shield layer earth
centralized control signal wire earth
The shielding layer should be
connected together
(shielding layer as isolation)
leak breaker
manual switch
(remote controller)
indoor unit
OK NO
BCB
C
BCB
C
(Fig. 2)
OK OK
PQP
Q
PQP
Q
(Fig.1)
OK OK
XYX
Y
XYX
Y
Indoor unit installation
6
The indoor and outdoor units should use separate special power lines.
The leak breaker and indoor switch using the same outdoor unit
should use the same power.
Indoor power
The remote controller wire is polarized 3-core wires.
The grouped remote controller wire (between the indoor
and indoor units) is polarized 2-core wires. (Fig. 2)
Central controller communication wiring
The centralized controller communication wire are nonpolarity 2-core wires.
To prevent electromagnetic disturbance, please use
shielded wires.
Remote controller wiring
(Fig.1)
The remote controller wire is low voltage circuit, which should not be connected to 220-230V
or 380-400V power line. It should not share the same wire pipe with the power cable.
The wire is round 3-core chielded wire, which can be extended to 200m if the diameter is
0.75mm2 and extended to 500m if the diameter is 1mm2.
Remote controller wiring
Wiring should be done according to the number of the block terminal
.....
11
Electrical wiring
Refrigerant piping
In order to drain water normally, the drain pipe shall be processed as specified in the installation
manual and shall be thermal insulated to avoid dew generation. Improper hose connection may
cause indoor water leakage.
Requirements
The indoor drain pipe shall be thermal insulated.
The connection part between the drain pipe and the indoor unit shall be insulated so as to
prevent dew generation.
The drain pipe shall be slant downwards (greater than 1/100). The middle part shall not be of
S type elbow, otherwise abnormal sound will be produced.
The horizontal length of the drain pipe shall be less than 20 m. In case of long pipe, supports
shall be provided every 1.5 - 2m to prevent wavy form.
Central piping shall be laid out according to the following figure.
Take care not to apply external force onto the drain pipe connection part.
Pipe and insulation material
Rigid PVC pipe VP31.5mm (internal diameter)
Foamed PE with thickness above 7 mm
Pipe
Insulation
Hose
Drain pipe size: 19.05mm (3/4") PVC pipe
The hose is used for adjusting the off-center and angle of the rigid PVC pipe.
Directly stretch the hose to install without making any deformation.
The soft end of the hose must be fastened with a hose clamp.
Please apply the hose on horizontal part
Insulation treatment:
Wrap the hose and its clamp until to the
indoor unit without any clearance with
insulating material, as shown in the figure.
Drain confirmation
During trial operation, check that there is no leakage at the pipe connection part during water
draining even in winter.
Wall
Outside
Slant
Drain pipe (supplied
by the user)
VP30
To the largest (app. 10cm)
Down slope above 1/100
S type elbow
1.5m~2m
Support
Insulation
(supplied by the user)
Down slope
above 1/100
! Caution
Hose Hose clamp
Subsidiary insulation
Insulation
Rigid PVC pipe
The electric wiring work shall be conducted by qualified electricians according to the installation
instructions. A separate power circuit shall be used. Insuf ficient power cord amperage or improper
wiring will cause danger of electric shock or fire.
During wiring connection, the power cord shall be of the specified cable and reliably fastened
so that external forces applied to the cable wouldn't transfer to the terminals. Improper connection
or fastening will cause danger of heating, fire etc.The power cord must be fitted with a grounding
wire.
Grounding shall be made as specified. Unreliable grounding will cause electric shock. The
grounding wire shall not be connected to the gas pipeline, water pipeline, thunder arrestor and
telephone wire.
! Warning
Electrical wiring
The specifications are listed in the table below. Smaller capacity may cause overheat or burnout.
Item
Indoor unit
power
Connecting cable
Model
15A
H05RN-F
3G1.5mm
2
5A/
250V
AC
2
<500m
1.5mm
2
500m<
1000m
2.5mm
2
L 50m
Manual
switch
Fuse
Power wire
(L)
Group controller wire
Number
of cores
Core sectional
area
Number
of cores
Indoor & outdoor
communication wire
remote controller wire
<500m
1.5mm
2
2
3
<200m
0.75mm
2
200m<
500m
1mm
2
! Caution
Power supply specifications
AE072~242FEAHA
Core sectional
area
Number
of cores
Core sectional
area
-230
(
)
-400
AE072~242FEBHA
AE072~242FEBIA
7
10
In installation, if there is refrigerant gas leakage, please take ventilation measures immediately.
The refrigerant gas will generate poisonous gas upon contacting fire.
After installation, please verify that there is no refrigerant leakage. The leaked refrigerant gas
will produce poisonous gas when meeting fire source such as heater and furnace etc.
Allowable pipe length and drop
These parameters differ according to the outdoor unit. See the instruction manual attached
with the outdoor unit for details.
Pipe material and size
Pipe material
Model
Phosphorus deoxidized copper seamless pipe (TP2) for air conditioner
Pipe size
(mm)
Gas side
Liquid side
Recharge refrigerant
The refrigerant supplementation shall be as specified in the installation instructions attached with
the outdoor unit. R22:AE072~242FEAHA.
R407C:AE072~242FEBHA;AE072~242FEBIA.
The adding procedure shall be aided with a measuring meter for a specified amount of supplemented
refrigerant.
Requirement
Overfilling or underfilling of refrigerant will cause compressor fault. The amount of the
added refrigerant shall be as specified in the instructions.
Connection of refrigerant pipe
Conduct flared connection work to connect all refrigerant pipes.
The connection of indoor unit pipes must use double spanners.
The installing torque shall be as given in the following table.
Double-spanner
operation
Connecting pipe
O.D.(mm)
ÿ6.35
ÿ9.52
ÿ12.70
ÿ15.88
Installing torque
(N-m)
11.8 (1.2kgf-m)
24.5 (2.5kgf-m)
49.0 (5.0 kgf-m)
78.4(8.0 kgf-m)
Increased installing
torque (N-m)
13.7 (1.4 kgf-m)
29.4 (3.0 kgf-m)
53.9 (5.5 kgf-m)
98.0(10.0 kgf-m)
! Caution
Refrigerant piping
AE072-162FEAHA
AE072-162FEBHA
AE072-162FEBIA
AE182-242FEAHA
AE182-242FEBHA
AE182-242FEBIA
Electrical wiring
Vacuum pumping
Open all valves
Gas leakage detection
Insulation treatment
With a vacuum pump,create vacuum from the stop valve of the outdoor unit.
Emptying with refrigerant sealed in the outdoor unit is absolutely forbidden.
Open all the valves on the outdoor unit.
Check with a leakage detector or soap water that if there is gas leakage at the pipe
connections and bonnets.
Conduct insulation treatment on both the gas side and liquid side of pipes respectively.
During cooling operation,both the liquid and gas sides are cold and thus shall be insulated
so as to avoid dew generation.
The insulating material at gas side shall be resistant to a temperature above 120 C
The indoor unit pipe connection part shall be insulated.
The notch upward(Attached detail view)
Indoor unit
Subsidiary insulation tube
Field piping side
8
9
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