Haier AU142AAERA User manual

ROOM AIR CONDITIONER
OUTDOOR UNIT
Before using the air conditioner,please read this manual carefully.
Please keep this manual properly for future use.
AU182AFERA
AU242AGERA
AU362AHERA
INSTALLATION INSTRUCTIONS
AU142AAERA
DC INVERTER
No.0010576506 B
   
http://splitoff.ru/tehn-doc.html
, ,  , .

CONTENTS
Name of Parts------------------------------------------------------------------1
Safety Cautions--------------------------------------------------------------2-7
Read Before Installation--------------------------------------------------8-12
Installation Procedure---------------------------------------------------13-22
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Name of Parts
Air inlet
Air outlet
(Inside of unit)
Compressor
Air inlet
Air outlet
(Inside of unit)
Compressor
AU362AHERA
1
AU182AFERA AU242AGERAAU142AAERA
Air inlet
Air outlet
(Inside of unit)
Compressor
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Be sure to conform with the following important Safety Cautions.
Safety Cautions
Carefully read the following information in order to operate the air conditioner
correctly.
WARNING!
If any abnormal phenomena is found
(e. g.smell of firing), please cut off the
power supply immediately, and contact
the dealer to find out the handling
method.
Don't dismantle the outlet of the
outdoor unit.
The exposure of fan is very dangerous
whichmay harm human beings.
Symbols used in the illustrations
:Indicates an action that must be avoided.
:Indicates that important instructions must be followed.
:Indicates a part which must be grounded.
:Beware of electric shock (This sumbol is displayed on the main unit label.)
After reading this handbook, hand it over to those who will be using the unit.
The user of the unit should keep this mamual at hand and make it available to those who will
be performing repairs or relocating the unit.
Also, make it available to the new user when the user changes hands.
Below are listed three kinds of Safety Cautions and Suggestions.
Incorrect operations may result in severe consequences of death or serious injuries.
WARNING!
CAUTION! Incorrect operations may result in injuries or machine damages; in some cases may
cause serious consequences.
INSTRUCTIONS:These information can ensure the correct operation of the machine.
switch
off
In such case, to continue using the
conditioner will damage the conditioner,
and may cause electrical shock or fire
hazard.
Incorrect maintenance and repairment
may cause water leak, electrical shock
and fire hazard.
When need maintenance and repairment,
call dealer to handle it.
After a long time use of air-conditioner
the base should be checked for any
damages.
If the damaged base is not repaired, the
unit may fall down and cause accidents.
2
!
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Air-conditioner can't be installed in
the environment with inflammable
gases because the inflammable gases
near to air-conditioner may cause fire
hazard.
Connect earthing wire.
Use discharge pipe correctly to ensure
efficient discharge.
Earthing wire should not be con-
nected to the gas pipe, water pipe,lightning rod or phone line, in-correct earthing may cause shock.
Incorrect pipe use may cause water
leaking.
Earthing
Safety Cautions
WARNING!
Installed electrical-leaking circuit
breaker.
It easily cause electrical shock without
circuit breaker.
Please let the dealer be responsible for
installing the conditioner.
Incorrect installation may cause water
leak, electrical shock and fire hazard.
Call the dealer to take measures to
prevent the refrigerant from leaking.
If conditioner is installed in a small
room be sure to take every measure in
order to prevent suffocation accident
even in case of refrigerant leakage.
When conditioner is deinstalled or
reinstalled dealer should be
responsible for them.
Incorrect installation may cause water
leaking, electrical shock and fire hazard.
No goods or nobody is permitted to
placed on or stand on outdoor unit.
The falling of goods and people may
cause accidents.
Don't operate the air-conditioner with
damp hands.
Otherwise will be shocked.
Only use correctly-typed fuse.
May not use wire or any other materials
replacing fuse, other-wise may cause
faults or fire accidents.
3
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Safety Cautions
Warning !
Have the unit professionally installed.
Improper installation by an unqualified person
may result in water leak, electric shock, or fire.
Be sure to carefully follow each step in this
handbook when installing the unit.
Improper installation may result in water leak,
electric shock, smoke or fire.
Have all electrical work performed by a
licensed electrician according to the local
regulations and the instructions given in
this manual. Secure a circuit designated
exclusively to the unit.
Place the unit on a stable, level surface that
withstands the weight of the unit to prevent
the unit from tipping over or falling causing
injury as a result.
Only use specified cables for wiring.Securely
connect each cable, and make sure that the
cables are not straining the terminals.
Cables not connected securely and properly may
generate heat and cause fire.
Take necessary safety measures against
typhoons and earthquakes to prevent the
unit from falling over.
Do not make any changes or modifications
to the unit. In case of problems, consult the
dealer.
If repairs are not made properly, the unit may
leak water and present a risk of electric shock, or
it may produce smoke or cause fire.
Improper installation or a lack of circuit capacity
may cause the unit to malfunction or present a
risk of electric shock, smoke,and fire.
Securely attach the terminal cover(panel)
on the unit.
If installed improperly, dust and/or water may
enter the unit and present a risk of electric shock,
smoke, or fire.
Only use refrigerant R410Aas indicated
on the unit when installing or relocating
the unit.
The use of any other refrigerant or an
introduction of air into the unit circuit may
cause the unit to run an abnormal cycle and
abnormal cycle and cause the unit to burst.
4
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Safety Cautions
In the event of a refrigerant gas leak,
provide adequate ventilation to the room.
Do not touch the fins on the heat exchanger
with bare hands:they are sharp and
dangerous.
If leaked refrigerant gas is exposed to a heat
source, noxious gases may form.
Direct expesure to outdoor air may present a
health hazard, and it may also cause food items
to deteriorate.
Do not try to defeat the safety features of
the devices, and do not change the settings.
Defeating the safety features on the unit such as
the pressure switch and temperature switch or
using parts other than the dealer or specialist
may result in fire or explosion.
When installing the unit in a small room,
safeguard against hypoxia that results from
leaked refrigerant reaching the threshold
level.
When relocating the air conditioner,
consult the dealer or a specialist.
Consult the dealer for necessary measures to take.
Improper installation may result in water leak,
electric shock, or fire.
After completing the service work, check
for a refrigerant gas leak.
If leaked gas refrigerant is exposed to a heat
source such as fan heater,stove,and electric grill,
noxious gases may form.
Only use specified parts.
Have the unit professionally installed.
Improper installation may cause water leak,
electric shock,smoke, or fire.
Precautions for handling Units for Use with R410A
Caution!
Do not use the existing refrigerant piping
The old refrigerant and refrigerator oil in the
existing piping contain a large amount of
chlorine, which will cause the refrigerator oil in
the new unit to deteriorate.
R410A is a high-pressure refrigerant,and the use
of the existing piping may result in bursting.
Keep the inner and outer surfaces of the
pipes clean and free of contaminants such
as sulfur, oxides, dust/dirt shaving particles,
oils,and moisture.
Contaminants inside the refrigerant piping will
cause the refrigerant oil to deteriorate.
Do not use the following tools that have
been used with the conventional
refrigerants. prepare tools that are for
exclusive use with R410A.
(Gauge manifold, charging hose, gas leak
detector,reverse-flow check valve,
refrigerant charge base,vacuum gauge,
and refrigerant recovery equipment.)
If refrigerant and/or refrigerant oil left on these
tools are mixed in with R410, or if water is
mixed with R410A, it will cause the refrigerant
to deteriorate.
Since R410A does not contain chlorine, gas-leak
detectors for conventional refrigerators will not
work.
WithAll-Fresh type air cinditioners, outdoor
air may be directly blown into the room
upon thermo off. Take this into consideration
when installing the unit.
Use a vacuum pump with a reverse-flow-
check valve.
If other types of valves are used, the vacuum
pump oil will flow back into the refrigerant cycle
and cause the refrigerator oil to deteriorate.
Warning !
5
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Safety Cautions
Caution!
Store the piping to be used during
installation indoors, and keep both ends of
the piping sealed until immediately before
brazing.(keep elbows and other joints
wrapped in plastic.)
A large amount of mineral oil will cause the
refrigerating machine oil to deteriorate.
Do not use a charging cylinder.
Exercise special care when handling the
tools.
An introduction of foreign objects such as dust,
dirt, or water into the refrigerant cycle will cause
the refrigerating machine oil to deteriorate.
Only use R410A refrigerant.
The use of refrigerants containing chlorine(i.e.
R22) will cause the refrigerant to deteriorate.
Before Installing the Unit
Warning!
Do not install the unit in a place where there
is a possibility of flammable gas leak.
Leaked gas accumulated around the unit may
start a fire.
When installing the unit in a hospital,take
necessary measures against noise.
High-frequency medical equipment may interfere
with the normal operation of the air conditioning
unit or the air conditioning unit may interfere
with the normal operation of the medical
equipment
Do not use the unit to preserve food,
animals, plants,artifacts, or for other special
purposes.
The unit is not designed to provide adepuate
conditions to preserve the quality of these items.
When humidity level exceeds 80% or when the
drainage system is clogged, indoor units may drip
water.
Installation of a centralized drainage system for
the outdoor unit may also need to be considered
to prevent water drips from the outdoor units.
If dust, dirt, or water enters the refrigerant cycle,
it may cause the oil in the unit to deteriorate or
may cause the compressor to malfunction.
Use a small amount of ester oil,ether oil, or
alkylbenzene to coat flares and flange
connections.
Use lipuid refrigerant to charge the system.
Charge the unit with gas refrigerant will cause
the refrigerant in the cylinder to change its
composition and will lead to a drop in
performance
The use of charging cylinder will change the
composition of the refrigerant and lead to power
loss.
Do not use the unit in an unusual
environment
The use of the unit in the presence of a large
amount of oil, steam,acid, alkaline solvents,or
special types of sprays may lead to a remarkable
drop in performance and/or malfunction and
presents a risk of electric shock, smoke, or fire.
The presence of organic solvents, corroded gas
(such as ammonia,sulfur compounds,and acid
may cause gas or water leak.)
Do not place the unit on or over things that
may not get wet.
6
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Safety Cautions
Caution!
If the wires are too taut, they may break or
generate heat and/or smoke and cause fire.
Use breakers and fuses (electrical current
breaker, remote switch<switch+Type-B
fuse>,molded case circuit breaker) with a
proper current capacity.
The use of large-capacity fuses, steel wire, or
copper wire may damage the unit or cause smoke
or fire.
Do not spray water on the air conditioners
or immerse the air conditioners in water.
Water on the unit presents a risk of electric shock.
When installing draining pipes, follow the
instructions in the manual, and make
sure that they properly drain water so as
to avoid dew condensation.
Things such as nails may be included in the
package. Dispose of them properly to prevent
injury.
Plastic bags present a choking hazard to children.
Tear up the plastic bags before disposing of them
to prevent accidents.
Make sure the wires are not subject to
tension.
Install a breaker for current leakage at the
power source to avoid the risk of electric
shock.
Without a breaker for current leakage, there is a
risk of electric shock, smoke, or fire.
Properly dispose of the packing materials.
Ground the unit.
Before installing(Relocating) the Unit or Performing Electric Work
Do not connect the grounding on the unit to gas
pipes,water pipes, lightning rods,or the
grounding terminals of telephones. Improper
grounding presents a risk of electric shock,
smoke, fire, or the noise caused by improper
grounding may cause the unit to malfunction.
Periodically check the platform on which
is placed for damage to prevent the unit
from falling.
If the unit is left on a damaged plarform, it may
topple over, causing injury.
If not installed properly, they may cause water
leaks and damage the furnishings.
Before the Test Run
Do not operate switches with wet hands to
avoid electric.
Do not touch the refrigerant pipes with
bare hands during and immediately after
operation.
Depending on the state of the refrigerant in the
system, certain parts of the unit such as the pipes
and compressor may become very cold or hot
and may subject the person to frost bites or
burning.
Allow for at least five minutes before turning off
the unit; otherwise, the unit may leak water or
experience other problems.
Do not turn off the power immediately
after stopping the unit.
Dust particles in the air may clog the system and
cause malfunction.
Do not operate the unit without air filters.
Do not operated the unit without panels
and safety guards in their proper places.
They are there to keep the users from injury from
accidentally touching rotating, high-tempreture
or high-voltage parts.
7
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Read Before Installation
Tools/Materials Use Notes
Gauge Manifold Evacuating,refrigerant charging 5.09MPa on the High-pressure side.
Charging Hose Evacuating, refrigerant charging Hose diameter larger than the
concentional ones.
Refrigerant Recovery
Equipment Refrigerant recovery
Refrigerant Cylinder Refrigerant charging Write down the refrigerant type.
Pink in color at the top of the cylinder.
Refrigerant Cylinder
Charging Port Refrigerant charging Hose diameter larger than the conventional ones.
Flare Nut Connecting the unit to piping Use Type-2 Flare nuts.
8
CAUTION!
Items to Be Checked
<1>. Verify the type of refrigerant used by the unit to be serviced.
Refrigerant Type: R410A
<2>. Check the symptom exhibited by the unit to be serviced.
Look in this sercice handbook for sympeoms relating to the refrigerant cycle.
<3>. Be sure to carefully read the Safety cautions at the beginning of this document.
<4>. If there is a gas leak or if the remaining refrigerant is exposed to an open flame, a
noxious gas hydrofluoric acid may form. Keep workplace well ventilated.
Install new pipes immediately after removing old ones to keep moisture out of the
refrigerant circuit.
Chloride in some types of refrigerants such as R22 will cause the refrigerating
machine oil to deteriorate.
Necessary Tools and Materials
Prepare the following tools and materials necessary for installing and servicing the unit.
[Necessary tools for use with R410A(Adaptability of tools that are for use with R22 and
R407C)]
1. To be used exclusively with R410A ( Not to be used if used with R22 or R407C )
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Tools/Materials Use Notes
Gas leak detector Detection of gas leaks The ones for HFC type refrigerant
may be used.
Vacuum Pump Vacuum drying May be used if a reverse flow check
adaptor is attached.
Refrigerant Recovery
Equipment Recovery of refrigerant May be used if designed for use with R410A.
Flare Tool Flare machining of piping Chages have been made in the flare
machining dimension.Refer to the
next page.
Tools/Materials Use Notes
Vacuum Pump with a
Check valve Vacuum drying
Bender Bending pipes
Pipe Cutter Cutting pipes
Torque Wrench Tightening flare nuts Only 12.70 (1/2'') and 15.88(5/8'')
have a larger flare machining
dimension.
Welder and Nitrogen
Cylinder Welding pipes
Refrigerant Charging
Meter Refrigerant charging
Vacuum Gauze Checking vacuum degree
Tools/Materials Use Notes
Charging Cylinder Refrigerant Charging
Must not be used with R410-type units.
Maximum Operation Pressure Applicable Refrigerants
3.4MPa R22, R407C
4.15MPa R410A
* Use pipes that meet the local standards.
Read Before Installation
9
2. Tools and materials that may be used with R410 with some restrictions
3. Tools and materials that are used with R22 or R407C that can also be used with
R410A
4. Tool and materials that must not used with R410A
Tools for R410A must be handled with special care; keep moisture and dust from
entering the cycle.
Piping Materials
<Types of Copper Pipes (Reference)>
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Use pipes made of phosphorus deoxidized copper.
Since the operation pressure of the units that use R410A is higher than that of the units for
use with R22, use pipes with at least the radial thickness specified in the chart below.
(Pipes with a radial thickness of 0.7mm or less may not be used.)
* Although it was possible to use type-O for pipes with a size of up to 19.05(3/4") with
conventional refrigerants, use type-1/2H pipes for units that use R410A.(Type-O pipes may
be used if the pipe size is 19.05 and the radial thickness is 1.2t.)
* The table shows the standards in Japan .using this table as a reference,choose pipes that
meet the local standards.
The flare machining dimensions for units that use R410A is larger than those for units that
use R22 in order to increase air tightness.
If a clutch type flare tool is used to machine flares on units that use R410A, make the
protruding part of the pipe between 1.0 and 1.5mm .Copper pipe gauge for adjusting the
length of pipe protrusion is useful.
Read Before Installation
10
<Piping Materials/Radial Thickness>
<Flare Machining(type-O and OL only)>
Flare Machining Dimension(mm)
External dimension
of pipes Size Dimension A
R410A R22
6.35
9.52
12.7
15.88
19.05
1/4"
3/8"
1/2"
5/8"
3/4"
9.1
13.2
16.6
19.7
24.0
9.0
13.0
16.2
19.4
23.3
<Flare Nut>
Type-2 flare nuts instead of type-1 s are used to increase the strength. The size of some of
the flare nuts have also been changed.
Flare nut dimension(mm)
External dimension
of pipes Size Dimension B
R410A(Type2) R22(Type1)
6.35
9.52
12.7
15.88
19.05
1/4"
3/8"
1/2"
5/8"
3/4"
17.0
22.0
26.0
29.0
36.0
17.0
22.0
24.0
27.0
36.0
Size(mm) Radial Thickness(mm)Size(inch) Type
Type-O pipes
Type-1/2H or Hpipes
6.35
9.52
12.7
15.88
1/4''
3/8''
1/2''
5/8''
0.8t
0.8t
0.8t
1.0t
19.05 3/4'' 1.0t
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1. Pressurize the equipment with nitrogen up to the design pressure and then judge the
equipment's air tightness, taking temperature variations into account.
2. When investigating leakage locations using a refrigerant, be sure to use R410A.
3. Ensure that R410A is in a liquid state when charging.
1. Use of oxygen as the pressurized gas may cause an explosion.
2. Charging with R410A gas will lead the composition of the remaining refrigerant in the
cylinder to change and this refrigerant can then not be used.
Read Before Installation
11
*The table shows the standards in Japan. Using this table as a reference, choose pipes that
meet the local standards.
Airtightness Test
No changes from the conventional method .Note that a refrigerant leakage detector for R22 or
R407C cannot detect R410A leakage.
3. Required accuracy of the vacuum gauge
Use a vacuum gauge that can measure up to 650Pa. Do not use a general gauge manifold
since it cannot measure a vacuum of 650Pa.
Halide torch R22 or R407C leakage detector
NO NO
Items to be strictly observed :
Vacuuming
Reasons :
1. Vacuum pump with check valve
A vacuum pump with a check valve is required to prevent the vacuum pump oil from flowing
back into the refrigerant circuit when the vacuum pump power is turned off (power failure).
It is also possible to attach a check valve to the actual vacuum pump afterwards.
2. Standard degree of vacuum for the vacuum pump
Use a pump which reaches 65Pa or below after 5 minutes of operation.
In addition, be sure to use a vacuum pump that has been properly maintained and oiled using
the specified oil. If the vacuum pump is not properly maintained, the degree of vacuum may
be too low.
4. Evacuating time
*Evacuate the equipment for 1 hour after 650Pa has been reached.
*After envacuating, leave the equipment for 1 hour and make sure the that vacuum is not lost.
5. Operating procedure when the vacuum pump is stopped
In order to prevent a backflow of the vacuum pump oil, open the relief valve on the vacuum
pump side or loosen the charge hose to drawn in air before stopping operation.
The same operating procedure should be used when using a vacuum pump with a check valve.
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1. R410A is a pseudo-azeotropic refrigerant (boiling point R32= -52*, R125= -49*) and can
roughly be handled in the same way as R22; however, be sure to fill the refrigerant from the
liquid side, for doing so from the gas side will somewhat change the composition of the
refrigerant in the cylinder.
Read Before Installation
12
Charging Refrigerant
R410A must be in a liquid state when charging.
Reasons :
Note :
* In the case of a cylinder with a syphon, liquid R410A is charged without turning the cylinder
up side down. Check the type of cylinder before charging.
When refrigerant leaks, additional refrigerant may be charged. (Add the refrigerant from the
liquid side)
Remedies to be taken in case of a refrigerant leak
* Because R410A is a simulated azeotropic refrigerant, it can be handled in almost the same
mammer as a single refrigerant such as R22. Howerver,if the refrigerant is removed in the
vapor phase , the composition of the refrigerant in the cylinder will somewhat change.
* Remove the refrigerant in the liquid phase. Additional refrigerant may be added in case of
a refrigerant leak.
Characteristics of the Conventional and the New Refrigerants
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Note :
(1) Fix the parts with screws
(2) Don't intake the strong wind directly to the
outlet air-flow hole.
(3) A one meter distance should be kept from the
unit top
(4) Don't block the surroundings of the unit with
sundries
Installation Procedure
2. Selection of the place of installation
1. Accessories
"Edging" for protection of electric wires from an
opening edge.
Select the place of installation satisfying the following conditions and, at the
same time, obtain a consent from the client or user.
Edging
Place where air circulates.
Place free from heat radiation from other heat sources.
Place where drain water may be discharged.
Place where noise and hot air may not disturb the neighborhood.
Place where there is not heavy snowfall in the winter time.
Place where obstacles do not exist near the air inlet and air outlet .
Place where the air outlet may not be exposed to a strong wind.
Place surrounded at four sides are not suitable for installation. A 1m or more
of overhead space is needed for the unit.
Mount guide-louvers to place where short-circuit is a possibility.
When installing several units, secure sufficient suction space to avoid short
circuiting.
Wind direction
NO
(2) Installation where the area with strong winds.
Install the unit so that the air outlet section of the unit must NOT be faced
toward wind direction.
(1) Open space requirement around the unit
L2
L3
L1
500
(Servicing
space)
Air outlet
Air inlet
Air
inlet
Case
Distance
Unit: mm
open open
open
500
150
150 300
300 0
L1
L2
L3
III III
Installation of outdoor unit
13
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(2) Installation sketch of outdoor unit
(a) Concrete foundation
3. Installation of outdoor unit
Fix the unit in a proper way according to the condition of a place where it is
installed by referring to the following .
(1) Installation
Install the unit so that the angle of inclination must be less than 3 degrees.
AU142AAERA AU182AFERA AU242AGERA AU362AHERA
Installation of outdoor unit
14
Installation Procedure
AU142AAERA
Anchor bolt
Concrete foundation
Unit
To fix by bolts
(b) Foundation anchor
Concrete foundation
Unit
Anchor bolt
550
310
52
780
640
Power Wiring Terminal
Power Wiring
Distribution Hole
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Installation of outdoor unit
15
Installation Procedure
AU182AFERA
Power Wiring Terminal
Power Wiring
Distribution Hole
810
680
580
288 315
AU242AGERA
Power Wiring Terminal
Power Wiring
Distribution Hole
860
730
630
308 335
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Installation of outdoor unit
16
Installation Procedure
Outdoor
unit
3-way stop valve
Gas pipe
Liquid
pipe
Flare connection
Indoor
unit
Outdoor
unit
Gas pipe
Liquid
pipe
Flare connection
Indoor
unit
3-way stop valve
3-way stop valve
Flare connection
(1) Outline piping
4. Refrigerant piping
2-way stop valve
AU362AHERA
580
340
380
Power Wiring Terminal
Power Wiring
Distribution Hole
25
948
840
AU142AAERA AU182AFERA
AU242AGERA AU362AHERA
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(2) Piping size
Liquid pipe
Gas pipe
9.52x0.8mm
15.88x1.0mm
(3) Limitations for one way piping length and vertical height difference.
Precautions for refrigerant piping
Do not twist or crush piping.
Be sure that no dust is mixed in piping.
Bend piping with as wide angle as possible.
Keep insulating both gas and liquid piping.
Check flare-connected area for gas leakage.
Connecting method (indoor unit)
Apply refrigerant oil at half union as large and flare nut.
To bend a pipe, give the roundness as possible not to crush
the pipe.
When connecting pipe, hold the pipe centre to centre then
screw nut on by hand, refer to Fig.
Be careful not to let foreign matters, such as sands enter
the pipe.
(4) Piping connection
Forced fastening without centering
may damage the threads and cause agas leakage.
Gas pipe 12.7x1.0mm
Liquid pipe 6.35x0.8mm
Pipe dia Fastening torque
Liquid pipe 6.35mm
Gas pipe 15.88mm
Liquid pipe 9.52mm 14.2-17.2N.m
61.8-75.4N.m
32.7-39.9N.m
Gas pipe 12.7mm 49.5-60.3N.m
Install the removed flare nuts to the pipes to be connected, then flare the pipes.
Model One way piping length Vertical height difference
(between indoor and outdoor)
less than 30 m
AU362AHERA
AU142AAERA
AU182AFERA
AU242AGERA
Refrigerant piping
17
AU242AGERA
AU362AHERA
Installation Procedure
AU142AAERA
AU182AFERA
less than 50 m
less than 15 m
less than 30 m
90+0.5
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After finishing connection of refrigerant pipe, it shall perform air tightness test.
The air tightness test adopts nitrogen tank to give pressure according to the pipe connection
mode as the following figure shown.
The gas and liquid valve are all in close state. In order to prevent the nitrogen entering the
circulation system of outdoor unit, tighten the valve rod before giving pressure (both gas
and liquid valve rods).
In the first to third test steps, if the pressure drops, check the leakage in each joint
use sense of hearing, feeling and soap water, etc. methods to find the leaking point.
After confirming the leaking point, welding it again or tighten the nut tightly again.
Checking the leaking point
First step: 0.3MPa (3.
0kg/cm2g) pressurizeover 3 minutes.
Second step: 1.5Mpa(15kg/cm2g) pressurize
over 3 minutes. Large
leakage will be found.
Third step: 3.0 MPa(30kg/cm2g)pressurizeabout 24 hours. Littleleakage will be found.
18
5. Air discharging method
Installation Procedure Refrigerant piping
From pressurizing to 24 hours later, each 1* difference of ambient temperature
will make 0.01MPa(0.1kg/cm2g) pressure change. It shall be corrected during test.
Check if the pressure drops
The pressure does not drop-passed
The pressure drops-check the leaking point.
Outdoor
Completely tightened
Completely tightened
Flare part
Outdoor units
Manhole
Discharging valve
3-way valve totally closed
(Gas side)
Low pressure peizometer
High pressure peizometer
Meter separator
Dropping valve
2-way valve totally closed
(Liquid side)
Nitrogen tank
VL VH
Indoor units
Indoor
Flare part
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