Friedrich M24YJ User manual

Installation Manual
TYPE : WALL MOUNTED
Applied Models :
M24YJ
M30YJ
M36YJ
ENGLISH FRANÇAIS ESPAÑOL
960-911-02

2
ENGLISH
• Do not cool excessively indoors. This may be harmful for your health and may consume more
electricity.
• Block sunlight with blinds or curtains while you are operating the air conditioner.
• Keep doors or windows closed tightly while you are operating the air conditioner.
• Adjust the direction of the air flow vertically or horizontally to circulate indoor air.
• Speed up the fan to cool or warm indoor air quickly, in a short period of time.
• Open windows regularly for ventilation as the indoor air quality may deteriorate if the air
conditioner is used for many hours.
• Clean the air filter once every 2 weeks. Dust and impurities collected in the air filter may block the
air flow or weaken the cooling / dehumidifying functions.
For your records
Staple your receipt to this page in case you need it to prove the date of purchase or for warranty
purposes. Write the model number and the serial number here:
Model number :
Serial number :
You can find them on a label on the side of each unit.
Dealer’s name :
Date of purchase :
Here are some tips that will help you minimize the power consumption when you use the air
conditioner. You can use your air conditioner more efficiently by referring to the instructions
below:
TIPS FOR SAVING ENERGY

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IMPORTANT SAFETY INSTRUCTIONS
READ ALL INSTRUCTIONS BEFORE USING THE APPLIANCE.
Always comply with the following precautions to avoid dangerous situations and ensure peak
performance of your product.
WARNING
It can result in serious injury or death when the directions are ignored.
CAUTION
It can result in minor injury or product damage when the directions are ignored.
WARNING
• Installation or repairs made by unqualified persons can result in hazards to you and others.
• Air conditioner Shall be installed in accordance with national wiring regulations.
• If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or
similary qualified persons in order to avoid a hazard.
• The information contained in the manual is intended for use by a qualified service technician familiar
with safety procedures and equipped with the proper tools and test instruments.
• Failure to carefully read and follow all instructions in this manual can result in equipment malfunction,
property damage, personal injury and/or death.
Installation
• Always perform grounding.
- Otherwise, it may cause electrical shock.
• Don’t use a power cord, a plug or a loose socket which is damaged.
- Otherwise, it may cause a fire or electrical shock.
• For installation of the product, always contact the service center or a professional installation agency.
- Otherwise, it may cause a fire, electrical shock, explosion or injury.
• Securely attach the electrical part cover to the indoor unit and the service panel to the outdoor unit.
- If the electrical part cover of the indoor unit and the service panel of the outdoor unit are not
attached securely, it could result in a fire or electric shock due to dust, water, etc.
• Always install an air leakage breaker and a dedicated switching board.
- No installation may cause a fire and electrical shock.
• Do not keep or use flammable gases or combustibles near the air conditioner.
- Otherwise, it may cause a fire or the failure of product.
• Ensure that an installation frame of the outdoor unit is not damaged due to use for a long time.
- It may cause injury or an accident.
• Do not disassemble or repair the product randomly.
- It will cause a fire or electrical shock.
• Do not install the product at a place that ther is concern of falling down.
- Otherwise, it may result in personal injury.
• Use caution when unpacking and installing.
- Sharp edges may cause injury.
• Thickness of copper pipes used are as shown “Flaring work” Table.
- Never use copper pipes thinner than that in the table even when it is available on the market
• Do not use copper pipes having a collapsed.
!
!
!

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- Otherwise, the expansion valve or capillary tube may become blocked with contaminants.
• For R410A model, use piping, flare nut and tools which is specified for R410A refrigerant.
- Using of (R22) piping, flare nut and tools may cause abnormally high pressure in the refrigerant
cycle (piping), and possibly result in explosion and injury.
• It is desirable that the amount of residual oil less than 40 mg/10m.
Operation
• Do not share the outlet with other appliances.
- It will cause an electric shock or a fire due to heat generation.
• Do not use the damaged power cord.
- Otherwise, it may cause a fire or electrical shock.
• Do not modify or extend the power cord randomly.
- Otherwise, it may cause a fire or electrical shock.
• Take care so that the power cord may not be pulled during operation.
- Otherwise, it may cause a fire or electrical shock.
• Unplug the unit if strange sounds, smell, or smoke comes from it.
- Otherwise, it may cause electrical shock or a fire.
• Keep the flames away.
- Otherwise, it may cause a fire.
• Take the power plug out if necessary, holding the head of the plug and do not touch it with wet hands.
- Otherwise, it may cause a fire or electrical shock.
• Do not use the power cord near the heating tools.
- Otherwise, it may cause a fire and electrical shock.
• Do not open the suction inlet of the indoor/outdoor unit during operation.
- Otherwise, it may electrical shock and failure.
• Do not allow water to run into electrical parts.
- Otherwise, it may cause the failure of machine or electrical shock.
• Hold the plug by the head when taking it out.
- It may cause electric shock and damage.
• Never touch the metal parts of the unit when removing the filter.
- They are sharp and may cause injury.
• Do not step on the indoor/outdoor unit and do not put anything on it.
- It may cause an injury through dropping of the unit or falling down.
• Do not place a heavy object on the power cord.
- Otherwise, it may cause a fire or electrical shock.
• When the product is submerged into water, always contact the service center.
- Otherwise, it may cause a fire or electrical shock.
• Take care so that children may not step on the outdoor unit.
- Otherwise, children may be seriously injured due to falling down.

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CAUTION
Installation
• Install the drain hose to ensure that drain can be securely done.
- Otherwise, it may cause water leakage.
• Install the product so that the noise or hot wind from the outdoor unit may not cause any damage to
the neighbors.
- Otherwise, it may cause dispute with the neighbors.
• Always inspect gas leakage after the installation and repair of product.
- Otherwise, it may cause the failure of product.
• Keep level parallel in installing the product.
- Otherwise, it may cause vibration or water leakage.
Operation
• Avoid excessive cooling and perform ventilation sometimes.
- Otherwise, it may do harm to your health.
• Use a soft cloth to clean. Do not use wax, thinner, or a strong detergent.
- The appearance of the air conditioner may deteriorate, change color, or develop surface flaws.
• Do not use an appliance for special purposes such as preserving animals vegetables, precision ma-
chine, or art articles.
- Otherwise, it may damage your properties.
• Do not place obstacles around the flow inlet or outlet.
- Otherwise, it may cause the failure of appliance or an accident.
!

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TABLE OF CONTENTS
2TIPS FOR SAVING ENERGY
3IMPORTANT SAFETY INSTRUCTIONS
7INSTALLATION PARTS
7INSTALLATION TOOLS
8INSTALLATION MAP
9INSTALLATION
9 Select the best Location
10 Fixing Installation Plate
10 Drill a Hole in the Wall
10 Flaring Work
11 Connecting the Piping
15 Connecting the Cables
18 Checking the Drainage
19 Forming of the Piping
19 Air Purging
23 Test Running
24 Installation guide at the seaside
25 Piping Length and Elevation
25 Operation ranges

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INSTALLATION TOOLS
Name Quantity Shape
Installation plate 1 EA
Type "A" screw
Type "B" screw
8 EA
2 EA
Remote control
holder
1 EA
The feature can be changed according a type of model.
Screws for fixing panels are attached to decoration panel.
Figure FigureName
Screw driver
Electric drill
Measuring tape, Knife
Hole core drill
Spanner
Torque wrench
Multi-meter
Hexagonal wrench
Ammeter
Gas-leak detector
Thermometer,
Level
Flaring tool set
Name
INSTALLATION PARTS

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INSTALLATION MAP
Vinyl tape (Wide)
• Apply after carrying out a
drainage test.
• To carry out the drainage
test, remove the air filters
and pour water into the heat
exchanger.
Saddle
Sleeve
Bushing-Sleeve
Putty(Gum Type Sealant)
Bend the pipe as closely
on the wall as possible,
but be careful that it
doesn't break.
Installation plate
Forced Operation Button
Air Discharge
Operation Indication Lamps/
Signal Receptor
Base Plate
Air Outlet
Air Inlet
Tubing Cover
Connecting cable (*)
Gas side piping (*)
Liquid side piping (*)
Additional drain pipe (*)
Vinyl tape (Narrow) (*)
Drain Hose
NOTE
!
• You should purchase the installation parts.
* The feature can be changed according to the type of model.

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Selectthe best Location
Indoor unit
- There should not be any heat or steam near
the unit.
- Select a place where there are no obstacles
around the unit.
- Make sure that condensation drainage can
be conveniently routed away.
- Do not install near a doorway.
- Ensure that the gap between a wall and the
left (or right) of the unit is more than 4in.
The unit should be installed as high as possi-
ble on the wall, allowing a minimum of 8in
from ceiling.
- Use a metal detector to locate studs to pre-
vent unnecessary damage to the wall.
* Recommended height 6.5ft from the floor
* The feature can be changed according to the
type of model.
Outdoor unit
- If an awning is built over the unit to prevent
direct sunlight or rain exposure, make sure
that heat radiation from the condenser is not
restricted.
- Ensure that the space around the back side
and other sides is more than 12in. The space
in front of the unit should be more than 28in.
- Do not place animals and plants in the path
of the warm air.
- Take the weight of the air conditioner into ac-
count and select a place where noise and vi-
bration are minimum.
- Select a place where the warm air and noise
from the air conditioner do not disturb neigh-
bors.
More than 8
More than 4
More than 4
(Unit : In)
More than
12in
More than
12in
Sunroof
Fence or
obstacles
More than
28in
More than
24in
(Unit : in)
NOTE
!
Remove obstructions to prevent blockage
of airflow path.
INSTALLATION

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Fixing Installation Plate
The wall you select should be strong and solid
enough to prevent vibration
1Mount the installation plate on the wall with
type "A" screws.
- Mount the installation plate horizontally by
aligning the centerline using Horizontal
meter .
2Measure the wall and mark the centerline.
It is also important to use caution
concerning the location of the installation
plate. Routing of the wiring to power outlets
is through the walls typically. Drilling the
hole through the wall for piping
connections must be done safely.
Drill aHole in the Wall
- Drill the piping hole with a ø65mm hole core
drill. Drill the piping hole at either the right or
the left with the hole slightly slanted to the
outdoor side.
Flaring Work
Main cause for gas leakage is due to defect of
flaring work. Carry out correct flaring work in
the following procedure.
1Use the piping kit accessory or the pipes
purchased locally.
2Measure the distance between the indoor
and the outdoor unit.
3Cut the pipes a little longer than measured
distance.
4Cut the cable 1.5m (4.9 ft) longer than the
pipe length.
CAUTION
Use the sleeve to prevent damage for
tube assembly.
!
Installation Plate
Chassis
Hook
Type "A" Screws
Installation plate
Left rear piping Right rear piping
43 Ø65 Ø65 43
110
120
5-7mm
(3/16"~5/16")
Indoor
WALL
Outdoor
Bushing
Sleeve
Copper
pipe
90°
Slanted Uneven Rough
Cut the pipesand the cable

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Bar
Copper pipe
Clamp handle Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Inclined
Inside is shiny without scratches
Smooth all round
Even length
all round
Surface
damaged Cracked Uneven thickness
= Improper flaring =
Pipe
Reamer
Point down
Flare nut
Copper tube
Outside diameter A Thickness
mm inch mm mm
Ø6.35 1/4" 1.1~1.3 0.7
Ø9.52 3/8" 1.5~1.7 0.8
Ø12.7 1/2" 1.6~1.8 0.8
Ø15.88 5/8" 1.6~1.8 1.0
1. Completely remove all burrs from the cut
cross section of pipe/tube.
2. While removing burrs put the end of the
copper tube/pipe in a downward direction
while removing burrs location is also
changed in order to avoid dropping burrs
into the tubing.
- Remove flare nuts attached to indoor and
outdoor units, then put them on the pipe/tube
which have completed its burr removal.
(not possible to put them on after finishing
flare work)
Flaring work
1Firmly hold copper pipe in a bar with the di-
mension shown in table below.
2Carry out flaring work with the flaring tool.
1Compare the flared work with the figures
given below.
2If a flared section is defective, cut it off and
do flaring work again.
Connecting the Piping
1Pull the screw cap at the bottom of the
indoor unit
2Remove the chassis cover from the unit by
loosing 5 screws (Be careful not to scratch
Horizontal Vane Main!)
Burrsremoval
Putting nut on
Check
Chassis cover

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3Pull back the tubing holder.
4Remove pipe port cover and positioning
the tubing
* The feature can be changed according to
type of model.
Good case
- Press on the tubing cover and unfold the
tubing to downward slowly. And then bend to
the left side slowly.
Bad case
- Following bending case from right to left di-
rectly may cause damage to the tubing.
* The feature can be changed according to
type of model.
1Hook the indoor unit onto the upper portion
of the installation plate.( engage the three
hooks at the top of the indoor unit with the
upper edge of the installation plate) Ensure
that the hooks are properly seated on the
installation plate by moving it left and right
Installation of Indoor Unit
CAUTION
Installation Information. For right piping.
Follow the instruction above.
!
Right
Back side view
Tubing holder
Backwards
Left
Pipe Port
1
2
Installation plate

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2Unlock the tubing holder from the chassis
and mount between the chassis and instal-
lation plate in order to separate the bottom
side of the indoor unit from the wall.
* The feature can be changed according to the
type of model.
1Raise the cover of terminal block.
2Insert the connecting cable through the
bottom side of indoor unit and connect the
cable. (You can see detail contents in
‘Connecting the cables’ section.)
Tubing Holder
Control Cover
1(L1) 2(L2) 3
1(L) 2(N)
3
Power connecting cable
Piping
<Left side piping>
Connecting pipe
Connecting
cable
Ta p e
Drain hose
Drain hose
3Tape the tubing pipe, drain hose and the
connection cable. Be sure that the drain
hose is located at the lowest side of the
bundle. Locating at the upper side can
cause overflow from the drain pan through
the inside of the unit.
* The feature can be changed according to
the type of model.
<Right side piping>
Connecting pipe
Connecting
cable
Tape
Drain hose
CAUTION
If the extension drain hose is routed inside
the room, insulate the hose with an insula-
tion material* so that dripping from sweat-
ing (condensation) could not damage fur-
niture or floors.
• Foamed polyethylene or equivalent is
recommended.
!
NOTE
!
Insert the drain hose at left side when you
use left side piping type.

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1Align the center of the pipes and sufficiently
tighten the flare nut by hand
2Tighten the flare nut with a wrench
3. When needed to extend the drain hose of
indoor unit, assembly the drain pipe as
shown on the drawing.
Indoor unit tubing Flare nut Pipes
Wrench
Indoor unit tubing
Open-end wrench
(fixed)
Connection
pipe
Flare nut
Vinyl tape(narrow)
Adhesive
Drain pipe
Indoor unit drain hose
Outside Diameter Torque
mm inch kgf·cm N·m
Ø6.35 1/4 180~250 17.6~24.5
Ø9.52 3/8 340~420 33.3~41.2
Ø12.7 1/2 550~660 53.9~64.7
Ø15.88 5/8 630~820 61.7~80.4
Connecting the installation pipe
and drain hose to the indoor unit.
Wrap the insulation material
around the connecting portion.
1Overlap the connection pipe insulation ma-
terial and the indoor unit pipe insulation
material. Bind them together with vinyl tape
so that there may be no gap.
2Set the tubing cutting line upward. Wrap
the area which accommodates the rear
piping housing section with vinyl tape.
3Bundle the piping and drain hose together
by wrapping them with vinyl tape sufficient
enough to cover where they fit into the rear
piping housing section.
Vinyl tape(narrow)
Connection pipe
Connecting cable
Vinyl tape (wide) Wrap with vinyl tape
Indoor unit pipe
Pipe
Gas Pipe Liquid Pipe
Cutting Line
Cutting Line
Good Case Bad Case
Wrap with vinyl tape
Drain hose
Pipe
Vinyl tape(wide)
Insulation material
* Tubing cutting line have to be upward.
Indoor Outdoor
Indoor Unit
Drain hose
Indoor Unit
Drain hose
Insulation
(More than 100~300mm
length and 7mm thickness)
Extension
drain hose

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Connecting the Cables
Connect the cable to the indoor unit by con-
necting the wires to the terminals on the con-
trol board individually according to the outdoor
unit connection. (Ensure that the color of the
wires of the outdoor unit and the terminal No.
are the same as those of the indoor unit.)
CAUTION
- The circuit diagram is a subject to
change without notice.
- The earth wire should be longer than the
common wires.
- When installing, refer to the circuit dia-
gram on the chassis cover.
- Connect the wires firmly so that they
may not be pulled out easily.
- Connect the wires according to color
codes, referring to the wiring diagram.
!
- Finally, tighten the flare nut with torque
wrench until the wrench clicks.
When tightening the flare nut with torque
wrench, ensure the direction for tightening
follows the arrow on the wrench.
Outdoor unit
Torque wrench
Liquid side piping
(Smaller diameter)
Gas side piping
(Bigger diameter)
Outside Diameter Torque
mm inch kgf·cm N·m
Ø6.35 1/4 180~250 17.6~24.5
Ø9.52 3/8 340~420 33.3~41.2
Ø12.7 1/2 550~660 53.9~64.7
Ø15.88 5/8 630~820 61.7~80.4
Connecting the Piping
- Remove the tubing cover from the unit by
loosening the screw.
- Align the center of the pipings and sufficiently
tighten the flare nut by hand.
Tubing
Cover
Cover
control
Terminal Block
Outdoor unit

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CAUTION
The power cord connected to the outdoor
unit should be complied with the following
specifications (UL recognized or CSA cer-
tified).
!
CAUTION
- Assemble it with conduit.
!
10±3mm
20mm
GN/YL
AWG_“A”
Power
Capacity(Btu/h)
24k,30k,36k
"A" 12
Power supply cable
10±3mm
20mm
GN/YL
AWG_“B”
The power connecting cable connected to the
indoor and outdoor unit should be complied
with the following specifications (UL recog-
nized or CSA certified).
Connecting
Cable
Capacity(Btu/h)
24k,30k,36k
"B" 18
Connecting cable
Indoor unit
1Insert the connecting cable through the
bottom side of indoor unit and connect the
cable (You can see detail contents in 'Con-
necting the cables' section)
2Secure the cable onto the control board
with the cable retainer.
3Tape the tubing pipe, drain hose and the
connection cable. Be sure that the drain
hose is located at the lowest side of the
bundle. Locating at the upper side can
cause overflow from the drain pan through
the inside of the unit.
Control Cover
1(L1) 2(L2) 3
1(L) 2(N)
3
Power connecting cable

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CAUTION
According to the confirmation of the above con-
ditions, prepare the wiring as follows.
1Never fail to have an individual power circuit
specifically for the air conditioner. As for the
method of wiring, be guided by the circuit
diagram posted on the inside of control
cover.
2The screw which fasten the wiring in the
casing of electrical fittings are liable to be-
come loose from vibrations to which the unit
is subjected during the transportation.
Check them and make sure that They all
are tightly fastened. (If they are loose, it
could cause burn-out of the wires.)
3Specification of power source.
4Confirm that electrical capacity is sufficient.
5See that the starting voltage is maintained
at more than 90 percent of the rated voltage
marked on the name plate.
6Confirm that the cable thickness is as speci-
fied in the power source specification.
(Particularly note the relation between cable
length and thickness.
7Always install an earth leakage circuit
breaker in a wet or moist area.
8The following would be caused by voltage
drop.
- Vibration of a magnetic switch, which will
damage the contact point, fuse breaking,
disturbance of the normal function of the
overload.
9The means for disconnection from a power
supply shall be incorporated in the fixed
wiring and have an air gap contact separa-
tion of at least 3mm in each active(phase)
conductors.
!
CAUTION
Provide the circuit breaker between power
source and the unit as shown by
!
Outdoor unit
- Connect the wires to the terminals on the
control board individually.
- Secure the cable onto the control board with
the cord clamp.
- Use a recognized circuit breaker between
the power source and the unit.
A disconnecting device to adequately discon-
nect all supply lines must be fitted.
*The feature can be changed according a type
of model.
Circuit Breaker(A)
Capacity(Btu/h)
24k,30k,36k
25
Air
Conditioner
Main power source
Circuit Breaker
Use a circuit breake
or time delay fuse.
Outdoor unit
Terminal block
Over 5mm
(0.2")
Cover control
Conduit panel
Connecting
cable
Power supply
cord
1(L1) 2(L2) 1(L1) 2(L2) 3

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* The feature can be changed according to the
type of model.
Checking the Drainage
1Pour a glass of water on the evaporator.
2Ensure the water flows through the drain
hose of the indoor unit without any leakage
and goes out the drain exit.
Tocheck the drainage.
Drain pan
Connecting area
drain hose
Leakage
checking
Drain hose
Leakage
checking
2Do not set the drain hose like the
following.
*The feature can be changed according a type
of model.
1The drain hose should point downward for
easy drain flow.
Do not raise
Water
leakage
Accumulated
drain water
Air
Waving
Water
leakage
Tip of drain hose
dipped in water
Water
leakage Ditch
Less than
50mm gap
Drain piping
Downward slope

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In cases where the outdoor unit is installed
above the Indoor unit perform the following.
1Tape the piping and connecting cable from
down to up.
2Secure the taped piping along the exterior
wall. Form a trap to prevent water entering
the room.
3Fix the piping onto the wall using saddle or
equivalent
Air Purging
The air and moisture remaining in the refriger-
ant system have undesirable effects as indi-
cated below.
- Pressure in the system rises.
- Operating current rises.
- Cooling(or heating) efficiency drops.
- Moisture in the refrigerant circuit may freeze
and block capillary tubing.
- Water may lead to corrosion of parts in the
refrigeration system.
Therefore, after evacuating the system, take a
leak test for the piping and tubing between the
indoor and outdoor unit.
Seal a small opening
around the pipings
with gum type sealant.
Trap
Trap
Taping
Saddle
Drain hose
Pipings
Connecting cable
Seal small openings
around pipings with a
gum type sealant.
Trap is required to prevent water
from entering into electrical parts.
Drain hose Vinyl tape(narrow)
Pipe
Wrap with
vinyl tape(wide)
Forming of the Piping
Form the piping by wrapping the connecting
portion of the indoor unit with insulation mate-
rial and secure it with two kinds of vinyl tapes.
- If you want to connect an additional drain
hose, the end of the drain outlet should be
routed above the ground. Secure the drain
hose appropriately.
In cases, where the outdoor unit is installed
below the Indoor unit, perform the following.
1Tape the piping, drain hose and connecting
cable from down to up.
2Secure the tapped piping along the exterior
wall using saddle or equivalent.
In cases, where the outdoor unit is installed
above the Indoor unit, perform the following.

20
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- Preparation
Check that each tube(both liquid and gas
side tubes) between the indoor and outdoor
units have been properly connected and all
wiring for the test run has been completed.
Remove the service valve caps from both the
gas and the liquid side on the outdoor unit.
Note that both the liquid and the gas side
service valves on the outdoor unit are kept
closed at this stage.
- Leak test
Connect the manifold valve(with pressure
gauges) and dry nitrogen gas cylinder to this
service port with charge hoses.
Air purging with vacuum pump
CAUTION
Be sure to use a manifold valve for air
purging. If it is not available, use a stop
valve for this purpose. The knob of the
3-way valve must always be kept close.
- Pressurize the system to maximum
250 P.S.I.G. (17.6 kgf/cm2G) (R-22
model) or 400 P.S.I.G. (28.1 kgf/cm2G)
(R-410A model) with dry nitrogen gas
and close the cylinder valve when the
gauge reading reaches 250 P.S.I.G.
(17.6 kgf/cm2G) (R-22 model) or 400
P.S.I.G. (28.1 kgf/cm2G) (R-410A model).
Next step is leak test with liquid soap.
!
CAUTION
To avoid nitrogen entering the refrigerant
system in a liquid state, the top of the
cylinder must be higher than its bottom
when you pressurize the system. Usually,
the cylinder is used in a vertical standing
position.
!
WARNING
!
There is a risk of fire and explosion.
Inert gas (nitrogen) should be used
when you check plumbing leaks, cleaning
or repairs of pipes etc.
If you are using combustible gases includ-
ing oxygen, product may have the risk of
fires and explosions.
- Do a leak test of all joints of the tubing(both
indoor and outdoor) and both gas and liquid
side service valves.
Bubbles indicate a leak. Be sure to wipe off
the soap with a clean cloth.
- After the system is found to be free of leaks,
relieve the nitrogen pressure by loosening
the charge hose connector at the nitrogen
cylinder. When the system pressure is re-
duced to normal, disconnect the hose from
the cylinder.
*The feature can be changed according a type
of model.
- Remove the caps from the 2-way and 3-way
valves.
- Remove the service-port cap from the 3-way
valve.
- Apply a soap water or a liquid neutral deter-
gent on the indoor unit connection or outdoor
unit connections by a soft brush to check for
leakage of the connecting points of the pip-
ing.
- If bubbles come out, the pipes have leakage
Lo Hi
Outdoor unit
Manifold valve
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
Pressure
gauge
Indoor unit
Soap water method