• INSTALLATION MANUAL
ENGLISH
FLOOR/CEILING TYPE
MODELS:
V4MKI-24UR/U4MRS-24
V4MKI-36UR/U4MRS-36
Accessories .................................................... 04
a. Indoor Unit Parts ........................................ 09
b. Indoor Unit Installation Instructions ....... 10
Safety Precautions ..................................... 05
Outdoor Unit Installation ......................... 11
a. Outdoor Unit Installation Instructions ..... 14
b. Outdoor Unit Types and Specifications ... 15
c. Notes on Drilling Hole in Wall .................... 16
Drainpipe Installation ............................... 17
Table of Contents
Installation Manual
Indoor Unit Installation
........................... 09
Installation Overview ............................... 08
1
2
5
3
4
6
Page 3
Refrigerant Piping Connection ...................... 19
A. Notes on Pipe Length and Elevation ............... 19
B. Refrigerant Piping Connection Instructions ... 20
Wiring ................................................. 22
a. Outdoor Unit Wiring ................... 22
b. Indoor Unit Wiring ...................... 23
c. Power Specifications .................... 24
Air Evacuation
................................................ 26
a. Evacuation Instructions ............................... 26
b. Note on Adding Refrigerant ...................... 27
Test Run .......................................................................................... 2829
MC MC
7
8
9
10
L N
(R32/R290 refrigerant )
C au t i o n : R isk of fire
European Disposal Guidelines .......................................................
11
Information servicing...................................................................... 30
12
Page 4
Accessories
1
The air conditioning system comes with the following accessories. Use all of the installation parts
and accessories to install the air conditioner. Improper installation may result in water leakage,
electrical shock and re, or equipment failure.
Name Shape Quantity
Refrigeration
Fittings
Soundproof/insulation
sheath (some models)
1
Drainpipe
Fittings
Outlet pipe sheath (some
models)
1
Outlet pipe clasp (some
models)
1
Drain joint (some models)
1
Seal ring (some models)
1
EMC Magnetic
Ring (some
models)
Remote
controller & Its
Frame (some
models)
Magnetic ring (wrap the
electric wires S1 & S2
( P & Q & E ) around
the magnetic ring twice)
Magnetic ring (Hitch it on
the connective cable
between indoor unit and
outdoor unit after
installation.)
1
1
1
2
1
1
1
1
2
Remote controller
Fixing screw for remote
controller holder ST2.9 x 10
Remote controller holder
Dry battery AAA
Owner’s manual
Installation manual
Remote controller illustration
S1&S2(P&Q&E)
Page 5
Safety Precautions
2
Read Safety Precautions Before Installation
Incorrect installation due to ignoring instructions can cause serious damage or injury.
The seriousness of potential damage or injuries is classified as either a WARNING or CAUTION.
Failure to observe a warning may result in death. The appliance must be installed in
accordance with national regulations.
Failure to observe a caution may result in injury or equipment damage.
WARNING
CAUTION
WARNING
• Carefully read the Safety Precautions before installation.
• In certain functional environments, such as kitchens, server rooms, etc., the use of specially
designed air-conditioning units is highly recommended.
• This appliance can be used by children aged from 8 years and above and persons with reduced
physical, sensory or mental capabilities or lack of experience and knowledge if they have been
given supervision or instruction concerning use of the appliance in a safe way and understand
the hazards involved. Children shall not play with the appliance. Cleaning and user
maintenance shall not be made by children without supervision.
• Do not use means to accelerate the defrosting process or to clean, other than those
recommended by the manufacturer.
• Only trained and certified technicians should install, repair and service this air
conditioning unit.
Improper installation may result in electrical shock, short circuit, leaks, fire or other damage to
the equipment and personal property.
• Strictly follow the installation instructions set forth in this manual.
Improper installation may result in electrical shock, short circuit, leaks, fire or other damage to
the equipment.
• Before you install the unit, consider strong winds, typhoons and earthquakes that might aect
your unit and locate it accordingly. Failure to do so could cause the equipment to fail.
• After installation, ensure there are no refrigerant leaks and that the unit is operating properly.
Refrigerant is both toxic and flammable and poses a serious health and safety risk.
An all-pole disconnection device which has at least 3mm clearances in all poles , and have a
leakage current that may exceed 10mA, the residual current device (RCD) having a rated residual
operating current not exceeding 30mA, and disconnection must be incorporated in the xed
wiring in accordance with the wiring rules.
Page 6 Page 6
Amount of refrigerant
to be charged (kg)
maximum installation
height (m)
Minimum room
area (m²)
≤2.048 1.8m 4
≤2.048 0.6m 35
2.048-3.0 1.8m 8
2.048-3.0 0.6m 80
>3.0 1.8m 9
>3.0
Model
(Btu/h)
≤30000
≤30000
30000-48000
30000-48000
>48000
>48000 0.6m 80
WARNING
• Appliance shall be installed, operated and stored in a room with a oor area larger than X m²,
installation of pipe-work shall be kept to a minimum X m²(Please see the following form ).
The appliance shall not be installed in an unventilated space, if that space is smaller than X m²
(Please see the following form ).Spaces where refrigerant pipes shall be compliance with
national gas regulations.
•
Any person who is involved with working on or breaking into a refrigerant circuit should hold a
current valid certicate from an industry-accredited assessment authority, which authorises their
competence to handle refrigerants safely in accordance with an industry recognised assessment
specication.
•
Servicing shall only be performed as recommended by the equipment manufacturer.
Maintenance and repair requiring the assistance of other skilled personnel shall be carried out
under the supervision of the person competent in the use of ammable refrigerants.
•
Appliance shall be stored in a well-ventilated area where the room size corresponds to the room
area as specied for operation.
•
Appliance shall be stored in a room without continuously operating open ames (for example
an operating gas appliance) and ignition sources (for example an operating electric heater).
• The appliance shall be stored in a room without continuously operating ignition sources
(for example: open ames, an operating gas appliance or an operating electric heater).
• Do not pierce or burn.
•
The appliance shall be stored so as to prevent mechanical damage from occurring.
•
•
Be aware that the refrigerants may not contain an odour.
• Keep ventilation openings clear of obstruction.
Compliance with national gas regulations shall be observed.
• A warning that the appliance shall be stored in a well-ventilated area where the room size
corresponds to the room area as specied for operation.
Note about Fluorinated Gasses
1. This air-conditioning unit contains fluorinated gasses. For specific information on the type of gas
and the amount, please refer to the relevant label on the unit itself.
2.
Installation, service, maintenance and repair of this unit must be performed by a certified technician.
3. Product uninstallation and recycling must be performed by a certified technician.
4. If the system has a leak-detection system installed, it must be checked for leaks at least every 12
months.
5.
When the unit is checked for leaks, proper record-keeping of all checks is strongly recommended.
CAUTION
CAUTION
CAUTION
This symbol shows that a service personnel should be handling this
equipment with reference to the installation manual.
This symbol shows that information is available such as the operating
manual or installation manual.
This symbol shows that this appliance uses a ammable refrigerant. If the
refrigerant is leaked and exposed to an external ignition source, there is a
risk of re.
This symbol shows that the operation manual should be read carefully.
WARNING
CAUTION
Explanation of symbols displayed on the indoor unit or outdoor unia
(applicable to the unit adopts R32/R290 Refrigerant only):
Page 7
Page 8
Unit Installation
Overview
Installation Overview
3
L N
1
2
3
4
5
MC MC
6
7
Install the indoor unit
(Page 9)
INSTALLATION ORDER
Install the outdoor unit
(Page 14)
Install the drainpipe
(Page 17)
Evacuate the refrigeration
system
(Page 26)
Connect the wires
(Page 22)
Connect the refrigerant
pipes
(Page 19)
Perform a test run
(Page 28)
Page 9
Indoor Unit
Installation
Air inlet
Display panel
Air outlet
grille
Louver
Installation part
Indoor Unit Installation
4
Indoor Unit Parts
Fig. 4.1
Safety Precautions
WARNING
• Securely install the indoor unit on a
structure that can sustain its weight. If the
structure is too weak, the unit may fall and
cause personal injury, unit and property
damage, or death.
• DO NOT install the indoor unit in a
bathroom or laundry room as excessive
moisture can short the unit and corrode the
wiring.
CAUTION
• Install the indoor and outdoor units, cables,
and wires at least 1m (3.2’) from televisions
and radios to prevent static or image
distortion. Depending on the appliances,
a 1m (3.2’) distance may not be sucient.
•
If the indoor unit is installed on metal,
it must be electrically grounded.
Page 10
Indoor Unit
Installation
Indoor Unit Installation Instructions
NOTE: Panel installation should be performed
after piping and wiring have been completed.
Step 1: Select installation location
The indoor unit should be installed in a location
that meets the following requirements:
Enough room exists for installation and
maintenance.
Enough room exists for the connecting the
pipe and drainpipe.
The ceiling is horizontal and its structure can
sustain the weight of the indoor unit.
The air inlet and outlet are not blocked.
The airflow can fill the entire room.
There is no direct radiation from heaters.
CAUTION
DO NOT install the unit in the following
Areas with oil drilling or fracking
Coastal areas with high salt content in the
air
Areas with caustic gases in the air, such as
hot springs
Areas that experience power uctuations,
such as factories
Enclosed spaces, such as cabinets
Kitchens that use natural gas
Areas with strong electromagnetic waves
Areas that store flammable materials or gas
Rooms with high humidity, such as
bathrooms or laundry rooms
RECOMMENDED DISTANCES BETWEEN THE INDOOR UNIT
The distance between the mounted indoor unit should meet the specications illlustrated in the
following diagram. (See Fig. 4.2)
Fig. 4.2
≥35mm
≥1000mm
≥ 35mm
≥ 35mm
locations:
Page 11
Indoor Unit
Installation
Fig. 4.3
Refrigerant pipe
connection
(D. gas side)
Refrigerant pipe
connection
(E. Liquid side)
Drain point
Hook
A
C
D
E
B
Table 4.1: Indoor parts installation size
MODEL(Btu/h) Length of A (mm/inch) Length of B (mm/inch)
18K~24K 1068/42 675/26.6
30K~48K 1285/50.6 675/26.6
36K~48K 1650/65 675/26.6
60K 1650/65 675/26.6
Length of C (mm/inch) Length of D (mm/inch) Length of E (mm/inch)
235/9.3 983/38.7 220/8.7
235/9.3 1200/47.2 220/8.7
235/9.3 1565/61.6 220/8.7
235/9.3 1565/61.6 220/8.7
Page 12
Indoor Unit
Installation
Cut o the roof beam.
Strengthen the area at which the cut was
made and consolidate the roof beam.
Fig. 4.6
Fig. 4.7
Fig. 4.8
Original concrete bricks
Steel roof beam structure
Install and use the supporting angle steel
directly. (See Fig.4.8)
Fig. 4.4
Wood
Place the square timber traversely over the roof
beam, then install the hanging screw bolts.
(See Fig.4.4)
Timber over the beam
Roof beam
Hanging screw bolts
Ceiling
Fig. 4.5
New concrete bricks
Inlaying or embedding the screw bolts.
(Blade shape insertion)
(Slide insertion)
Steel bar
Embedding screw bolt
(Pipe hanging and embedding screw bolt)
Hanging screw bolt
Hanging
bolts
Supporting
angle steel
CAUTION
The unit body should align perfectly with the
hole. Ensure that the unit and the hole are the
same size before moving on.
2.
Install the pipes and lines in the ceiling after
installing the main body. When choosing
where to start the, determine the direction of
the pipes to be drawn out. In cases where
there is a ceiling, position the refrigerant pipes,
drain pipes, and indoor and outdoor lines to
the connection points before mounting the
machine.
3.
The installation of hanging screw bolts.
4. After the selection of installation location,
position the refrigerant pipes, drain pipes,
and indoor and outdoor wires to the
connection points before mounting the
machine.
5.
Drill 4 holes 10cm (4”) deep at the ceiling
hook positions in the internal ceiling. Be sure
to hold the drill at a 90° angle to the ceiling.
6.
Secure the bolt using the included washers
and nuts.
7.
Install the four suspension bolts.
8.
Mount the indoor unit. You will need two
people to lift and secure it. Insert suspension
bolts into the unit’s hanging holes. Fasten
them using the included washers and nuts.
(See Fig. 4.9).
Fig. 4.9
Step 2: Hang indoor unit
Install the hanging hook with expansible
bolt into the concrete to a depth of
45~50mm to prevent loosening.
Page 13
Indoor Unit
Installation
Fig. 4.10
Fig. 4.12
Fig. 4.13
Fig. 4.14
9. Remove the side board and the grille.
(See Fig. 4.10).
Fig. 4.11
Screw nut
Washer
Hanging screw bolt
Overhang part
Shockproof cushion
NOTE: Conrm the minimum drain tilt is 1/100 or
more.
10. Mount the indoor unit onto the hanging
screw bolts with a block.
Position the indoor unit on a at level by
using a level to prevent leaks.
(See Fig. 4.11).
Wall Mounting Installtion
Ceiling Installation
20mm
D. Refrigerant pipe
connection
(D.gas side)
Drain point
Downward slope between(1-2)/100
E. Refrigerant pipe
connection
(E. Liquid side)
Side board
Grille
Hanging arm
Hanging
screw bolt
Page 14
Outdoor Unit
Installation
Outdoor Unit Installation
Outdoor Unit Installation Instructions
Step 1: Select installation location.
The outdoor unit should be installed in the
location that meets the following requirements:
Place the outdoor unit as close to the indoor
unit as possible.
Ensure that there is enough room for
installation and maintenance.
The air inlet and outlet must not be
obstructed or exposed to strong wind.
Ensure the location of the unit will not be
subject to snowdrifts, accumulation of leaves
or other seasonal debris. If possible, provide
an awning for the unit. Ensure the awning
does not obstruct airflow.
The installation area must be dry and well
ventilated.
There must be enough room to install the
connecting pipes and cables and to access
them for maintenance.
The area must be free of combustible gases
and chemicals.
The pipe length between the outdoor and
indoor unit may not exceed the maximum
allowable pipe length.
If possible, DO NOT install the unit where it
is exposed to direct sunlight.
If possible, make sure the unit is located far
away from your neighbors’ property so that
the noise from the unit will not disturb them.
If the location is exposed to strong winds (for
example: near a seaside), the unit must be
placed against the wall to shelter it from the
wind. If necessary, use an awning.
(See Fig. 5.1 & 5.2)
Install the indoor and outdoor units, cables
and wires at least 1 meter from televisions or
radios to prevent static or image distortion.
Depending on the radio waves, a 1 meter
distance may not be enough to eliminate all
interference.
Strong wind
Strong wind
Fig. 5.1
Fig. 5.2
Step 2: Install outdoor unit.
Fix the outdoor unit with anchor bolts (M10)
>60cm / 23.6”
Fix with bolts
CAUTION
• Be sure to remove any obstacles that
may block air circulation.
• Make sure you refer to Length
Specifications to ensure there is
enough room for installation and
maintenance.
Fig. 5.3
5
√
√
√
√
√
√
√
√
√
√
√
√
Page 15
Outdoor Unit
Installation
>120cm / 47”
Air Outlet
(Wall or obstacle)
H
D
W
>30cm / 11.8”
Air inlet
Air inlet
Air inlet
Air inlet
(Wall or obstacle)
>30cm / 11.8”
>30cm / 11.8”
>30cm / 11.8”
Table 5.1: Length Specifications of Split Type
Outdoor Unit (unit: mm/inch)
Table 5.2: Length Specifications of Vertical
Discharge Outdoor Unit (unit: mm/inch)
MODEL
DIMENSIONS
W H D
18 633/25 554/21.8554/21.8
24 633/25 554/21.8554/21.8
36 759/29.8 554/21.8554/21.8
36 633/25 600/23.6600/23.6
48 759/29.8 710/28710/28
60 843/33 710/28710/28
Split Type Outdoor Unit
(Refer to Fig 5.4, 5.5, 5.6, 5.10 and Table 5.1)
Vertical Discharge Type Outdoor Unit
(Refer to Fig 5.7, 5.8, 5.9 and Table 5.2)
Fig. 5.7
Fig. 5.8
Fig. 5.9
Fig. 5.6
Fig. 5.5
A
B
D
W
H
W
H
Fig. 5.4
Outdoor Unit Dimensions
W x H x D
Mounting Dimensions
Distance A Distance B
760x590x285 (29.9x23.2x11.2) 530 (20.85) 290 (11.4)
810x558x310 (31.9x22x12.2) 549 (21.6) 325 (12.8)
845x700x320 (33.27x27.5x12.6) 560 (22) 335 (13.2)
900x860x315 (35.4x33.85x12.4) 590 (23.2) 333 (13.1)
945x810x395 (37.2x31.9x15.55) 640 (25.2) 405 (15.95)
990x965x345 (38.98x38x13.58) 624 (24.58) 366 (14.4)
946x810x420 (37.24x31.9x16.53) 673 (26.5)
403 (15.87)
946x810x410 (37.24x31.9x16.14) 673 (26.5)
403 (15.87)
952x1333x410 (37.5x52.5x16.14) 634 (24.96)
404 (15.9)
952x1333x415 (37.5x52.5x16.34) 634 (24.96)
404 (15.9)
845x702x363 (33.27x27.6x14.3)
540 (21.26)
350 (13.8)
938x1369x392 (36.93x53.9x15.43) 634 (24.96) 404 (15.9)
900x1170x350 (35.4x46x13.8) 590 (23.2) 378 (14.88)
800x554x333 (31.5x21.8x13.1) 514 (20.24) 340 (13.39)
Page 16
Outdoor Unit
Installation
NOTE:
The minimum distance between the
outdoor unit and walls described in the
installation guide does not apply to airtight
rooms. Be sure to keep the unit unobstructed
in at least two of the three directions (M, N, P)
(See Fig. 5.10)
M
N
P
30 cm / 11.8” from back wall
60 cm / 23.6” on right
60 cm / 23.6” above
30 cm / 11.8” on left
200 cm / 78” in front
Fig. 5.10
Drain Joint Installation
NOTE: Make sure the water drains to a safe
location where it will not cause water damage
or a slipping hazard.
Seal
Drain joint
(A) (B)
Base pan hole of
outdoor unit
Seal
Fig. 5.12
Notes On Drilling Hole In Wall
You must drill a hole in the wall for the
refrigerant piping, and the signal cable that will
connect the indoor and outdoor units.
1.
Determine the location of the wall hole
based on the location of the outdoor unit.
2.
Using a 65-mm (2.5”) core drill, drill a hole
in the wall.
NOTE: When drilling the wall hole, make
sure to avoid wires, plumbing, and other
sensitive components.
3.
Place the protective wall cu in the hole.
This protects the edges of the hole and will
help seal it when you nish the installation
process.
Fig. 5.11
L
H
300 cm / 118” or more
A
60 cm / 23.6”
or more
150 cm / 59”
or more
25 cm / 9.8”
or more
25 cm / 9.8”
or more
Rows of series installation
L ≤ H
L ≤ 1/2H
L A
25 cm / 9.8” or more
1/2H < L ≤ H
30 cm / 11.8” or more
L > H
Can not be installed
Table 5.3 The relations between H, A and L
are as follows.
If the drain joint comes with a rubber seal
(see Fig. 5.12 - A ), do the following:
1. Fit the rubber seal on the end of the drain joint
that will connect to the outdoor unit.
2. Insert the drain joint into the hole in the base
pan of the unit.
3. Rotate the drain joint 90° until it clicks in place
facing the front of the unit.
4. Connect a drain hose extension (not included)
to the drain joint to redirect water from the
unit during heating mode.
If the drain joint doesn’t come with a rubber
seal (see Fig. 5.12 - B ), do the following:
1. Insert the drain joint into the hole in the base
pan of the unit. The drain joint will click in
place.
2. Connect a drain hose extension (not included)
to the drain joint to redirect water from the
unit during heating mode.
Page 17
Drainpipe
Installation
NOTE ON DRAINPIPE INSTALLATION
•
When using an extended drainpipe, tighten
the indoor connection with an additional
protection tube to prevent it from pulling
loose.
• The drainpipe should slope downward at a
gradient of at least 1/100 to prevent water
from flowing back into the air conditioner.
• To prevent the pipe from sagging, space
hanging wires every 1-1.5m (39-59”).
• Incorrect installation could cause water to
flow back into the unit and flood it.
The drainpipe is used to drain water from the
unit. Improper installation may cause unit and
property damage.
CAUTION
•
Insulate all piping to prevent condensation
and water damage.
• If the drainpipe is bent or installed
incorrectly, water may leak and cause a
malfunction of the water-level switch.
• In HEAT mode, the outdoor unit will
discharge water. Ensure that the drain hose
is placed in an appropriate area to avoid
water damage and slippage due to frozen
drain water.
• DO NOT pull the drainpipe forcefully as this
could cause it to disconnect.
NOTE ON PURCHASING PIPES
This installation requires a polyethylene tube
(outside diameter = 3.7-3.9cm, inside diameter
= 3.2cm), which can be obtained at your local
hardware store or dealer.
Indoor Drainpipe Installation
Install the drainpipe as shown in Figure 6.2.
1.
2.
Drainpipe
connecting port
Drain hose
Pipe clasp
Insulation
Fig. 6.1
Drainpipe Installation
Fig. 6.2
6
Cover the drainpipe with heat insulation to
prevent condensation and leakage.
Attach the mouth of the drain hose to the
unit’s outlet pipe. Sheath the mouth of the
hose and clip it rmly with a pipe clasp.
(Fig 6.1)
Downward slope
1/100
1-1.5m
(39-59”)
NOTE: When connecting multiple drainpipes,
install the pipes as shown in Fig 6.3.
≥10cm
(4”)
Fig. 6.3
Page 18
Drainpipe
Installation
3. Using a 65-mm (2.5”) core drill, drill a hole in
the wall. Make sure that the hole is drilled at
a slight downward angle, so that the outdoor
end of the hole is lower than the indoor end
by about 12mm (0.5”). This will ensure proper
water drainage (See Fig. 6.4). Place the
protective wall cu in the hole. This protects
the edges of the hole and will help seal it
when you nish the installation process.
Wall
IndoorOutdoor
≈ 12mm / 0.5 inch
Fig. 6.4
NOTE: When drilling the hole in the wall, make
sure to avoid wires, plumbing, and other
sensitive components.
4. Pass the drain hose through the hole.
Make sure the water drains to a safe location
where it will not cause water damage or a
slippage.
NOTE: The drainpipe outlet should be at least
5cm (1.9”) above the ground. If it touches the
ground, the unit may become blocked and
malfunction. If you discharge the water directly
into a sewer, make sure that the drain has a U
or S pipe to prevent unwanted odors from
entering the house.
Page 19
Refrigerant Piping
Connection
Refrigerant Piping Connection
Safety Precautions
WARNING
• All eld piping must be completed by a
licensed technician and must comply with
the local and national regulations.
• When the air conditioner is installed in a
small room, measures must be taken to
prevent the refrigerant concentration in
the room from exceeding the safety limit
in the event of refrigerant leakage. If the
refrigerant leaks and its concentration
exceeds its proper limit, hazards due to
lack of oxygen may result.
• When installing the refrigeration system,
ensure that air, dust, moisture or foreign
substances do not enter the refrigerant
circuit. Contamination in the system may
cause poor operating capacity, high
pressure in the refrigeration cycle,
explosion or injury.
• Ventilate the area immediately if there is
refrigerant leakage during the installation.
Leaked refrigerant gas is both toxic and
flammable. Ensure there is no refrigerant
leakage after completing the installation
work.
Notes On Pipe Length and Elevation
Ensure that the length of the refrigerant pipe, the
number of bends, and the drop height between
the indoor and outdoor units meets the
requirements shown in Table 7.1:
Table 7.1: The Maximum Length And Drop
Height Based on Models. (Unit: m/ft.)
Type of model Capacity
(Btu/h)
Length of
piping
Maximum drop
height
North America,
Australia and the
eu frequency
conversion Split
Type
<15K 25/82 10/32.8
≥15K - <24K 30/98.4 20/65.6
≥24K - <36K 50/164 25/82
≥36K - ≤60K 65/213 30/98.4
Other Split Type
12K 15/49 8/26
18K-24K 25/82 15/49
30K-36K 30/98.4 20/65.6
42K-60K 50/164 30/98.4
Refrigerant Piping with Twin Indoor Units
When installing multiple indoor units with a single outdoor unit, ensure that the length of the
refrigerant pipe and the drop height between the indoor and outdoor units meet the requirements
illustrated in the following diagram:
L
L1
L2
H2
The line branch pipe
Indoor unit
Outdoor unit
H1
Indoor unit
The drop height
between two
indoor units
must be less
than or equal to
50cm (19.6”)
The drop height
between indoor
unit
and outdoor unit
must be less than
or equal to 20m
(65.6’)
Fig. 7.1
7
Page 20
Refrigerant Piping
Connection
Table 7.2
Permitted length
Piping
length
Total piping length 18K+18K 30m/98’ L+Max
(L1, L2)
24K+24K
30K+30K
50m/164’
(farthest distance from
the line pipe branch)
15m/49’ L1, L2
(farthest distance from
the line pipe branch)
10m/32.8’ L1-L2
Drop
height
Drop height between
indoor and outdoor unit
20m/65.6’ H1
Drop height between
two indoor units
0.5m/1.6’ H2
Refrigerant Piping Connection Instructions
CAUTION
• The branching pipe must be installed
horizontally. An angle of more than 10° may
cause malfunction.
• DO NOT install the connecting pipe until
both indoor and outdoor units have been
installed.
• Insulate both the gas and liquid piping to
prevent water leakage.
Step1: Cut pipes
When preparing refrigerant pipes, take extra
care to cut and flare them properly. This will
ensure efficient operation and minimize the
need for future maintenance.
1.
Measure the distance between the indoor
and outdoor units.
2.
Using a pipe cutter, cut the pipe a little
longer than the measured distance.
CAUTION
DO NOT deform pipe while cutting. Be extra
careful not to damage, dent, or deform the pipe
while cutting. This will drastically reduce the
heating efficiency of the unit.
1.
Make sure that the pipe is cut at a perfect 90°
angle. Refer to Fig. 7.2 for examples of bad cuts
Oblique
Rough
Warped
90°
Fig. 7.2
Step 2: Remove burrs.
Burrs can aect the air-tight seal of refrigerant
piping connection. They must be completely
removed.
1. Hold the pipe at a downward angle to
prevent burrs from falling into the pipe.
2. Using a reamer or deburring tool, remove
all burrs from the cut section of the pipe.
Pipe
Reamer
Point down
Fig. 7.3
Step 3: Flare pipe ends
Proper flaring is essential to achieve an airtight
seal.
1. After removing burrs from cut pipe, seal
the ends with PVC tape to prevent foreign
materials from entering the pipe.
2. Sheath the pipe with insulating material.
3. Place flare nuts on both ends of pipe.
Make sure they are facing in the right
direction, because you can’t put them on
or change their direction after flaring. See
Fig. 7.4
Flare nut
Copper pipe
Fig. 7.4
4. Remove PVC tape from ends of pipe when
ready to perform flaring work.
5. Clamp flare form on the end of the pipe.
The end of the pipe must extend beyond
the flare form.
Flare form
Pipe
Fig. 7.5
Page 21
Refrigerant Piping
Connection
6. Place flaring tool onto the form.
7. Turn the handle of the flaring tool
clockwise until the pipe is fully flared. Flare
the pipe in accordance with the dimensions
shown in table 7.3.
Table 7.3: PIPING EXTENSION BEYOND FLARE
FORM
Pipe
gauge
Tightening
torque
Flare dimension (A)
(Unit: mm/Inch)
Flare shape
Min. Max.
Ø 6.4
R0.4~0.8
45
°
±
2
90
°
±
4
A
Fig. 7.6
Ø 9.5
Ø 12.7
Ø 15.9
Ø 19.1
8. Remove the flaring tool and flare form,
then inspect the end of the pipe for cracks
and even flaring.
Step 4: Connect pipes
Connect the copper pipes to the indoor unit first,
then connect it to the outdoor unit. You should
first connect the low-pressure pipe, then the highpressure pipe.
1.
When connecting the flare nuts, apply a
thin coat of refrigeration oil to the flared
ends of the pipes.
2.
Align the center of the two pipes that you
will connect.
Indoor unit tubing
Flare nut
Pipe
Fig. 7.7
3.
Tighten the flare nut as tightly as possible
by hand.
4. Using a spanner, grip the nut on the unit
tubing.
5. While firmly gripping the nut, use a torque
wrench to tighten the flare nut according
to the torque values in table 7.5.
NOTE: Use both a spanner and a torque wrench
when connecting or disconnecting pipes to/from
the unit.
Fig. 7.8
CAUTION
• Ensure to wrap insulation around the piping.
Direct contact with the bare piping may result
in burns or frostbite.
•
Make sure the pipe is properly connected.
Over tightening may damage the bell mouth
and under tightening may lead to leakage.
NOTE ON MINIMUM BEND RADIUS
Carefully bend the tubing in the middle
according to the diagram below. DO NOT bend
the tubing more than 90° or more than 3 times.
Bend the pipe with thumb
min-radius 10cm (3.9”)
Fig. 7.9
6.
After connecting the copper pipes to the
indoor unit, wrap the power cable, signal
cable and the piping together with
binding tape.
NOTE: DO NOT intertwine signal cable with
other wires. While bundling these items
together, do not intertwine or cross the signal
cable with any other wiring.
7. Thread this pipeline through the wall and
connect it to the outdoor unit.
8. Insulate all the piping, including the valves
of the outdoor unit.
9. Open the stop valves of the outdoor unit
to start the flow of the refrigerant between
the indoor and outdoor unit.
CAUTION
Check to make sure there is no refrigerant leak
after completing the installation work. If there is
a refrigerant leak, ventilate the area immediately
and evacuate the system (refer to the Air
Evacuation section of this manual).
Ø 22
65-67 N.m
(663-683 kgf.cm)
23.2/0.91 23.7/0.93
75-85N.m
(765-867 kgf.cm)
26.4/1.04 26.9/1.06
18-20 N.m
(183-204 kgf.cm)
8.4/0.33 8.7/0.34
25-26 N.m
(255-265 kgf.cm)
13.2/0.52 13.5/0.53
35-36 N.m
(357-367 kgf.cm)
16.2/0.64 16.5/0.65
45-47 N.m
(459-480 kgf.cm)
19.2/0.76 19.7/0.78
Page 22
Wiring
TAKE NOTE OF FUSE SPECIFICATIONS
The air conditioner’s circuit board(PCB) is
designed with a fuse to provide overcurrent
protection. The specications of the fuse are
printed on the circuit board, such as:
Indoor unit: T5A/250VAC, T10A/250VAC.
(applicable for unit adopts R32 refrigerant)
Outdoor unit: T20A/250VAC(for <24000Btu/h
unit), T30A/250VAC(for >24000Btu/h unit)
Wiring
Safety Precautions
WARNING
• Be sure to disconnect the power supply
before working on the unit.
• All electrical wiring must be done
according to local and national regulations.
• Electrical wiring must be done by a
qualied technician. Improper connections
may cause electrical malfunction, injury
and fire.
• An independent circuit and single outlet
must be used for this unit. DO NOT plug
another appliance or charger into the
same outlet.If the electrical circuit capacity
is not enough or there is a defect in the
electrical work, it can lead to shock, fire,
unit and property damage.
• Connect the power cable to the terminals
and fasten it with a clamp. An insecure
connection may cause fire.
• Make sure that all wiring is done correctly
and the control board cover is properly
installed. Failure to do so can cause
overheating at the connection points, fire,
and electrical shock.
• Ensure that main supply connection is
made through a switch that disconnects
all poles, with contact gap of a least 3mm
(0.118”).
• DO NOT modify the length of the power
cord or use an extension cord.
CAUTION
• Connect the outdoor wires before
connecting the indoor wires.
• Make sure you ground the unit. The
grounding wire should be away from gas
pipes, water pipes, lightning rods,
telephone or other grounding wires.
Improper grounding may cause electrical
shock.
• DO NOT connect the unit with the power
source until all wiring and piping is
completed.
• Make sure that you do not cross your
electrical wiring with your signal wiring, as
this can cause distortion and interference.
Follow these instructions to prevent distortion
when the compressor starts:
• The unit must be connected to the main
outlet. Normally, the power supply must
have a low output impedance of 32 ohms.
• No other equipment should be connected
to the same power circuit.
• The unit’s power information can be found
on the rating sticker on the product.
Outdoor Unit Wiring
WARNING
Before performing any electrical or wiring work,
turn o the main power to the system.
1. Prepare the cable for connection
a. You must first choose the right cable size
before preparing it for connection. Be sure
to use H07RN-F cables.
Table 8.1: Minimum Cross-Sectional Area
of Power and Signal Cables North America
Rated Current of
Appliance (A)
AWG
≤ 7 18
7 - 13 16
13 - 18 14
18 - 25 12
25 - 30 10
8
NOTE: The fuse is made of ceramic.
Page 23
Wiring
b. Using wire strippers, strip the rubber jacket
from both ends of a signal cable to reveal
about 15cm (5.9”) of the wires inside.
c.
Strip the insulation from the ends of the
wires.
d. Using a wire crimper, crimp u-lugs on the
ends of the wires.
NOTE: While connecting the wires, strictly
follow the wiring diagram (found inside the
electrical box cover).
2. Remove the electric cover of the outdoor unit.
If there is no cover on the outdoor unit,
disassemble the bolts from the maintenance
board and remove the protection board.
(See Fig. 8.1, 8.2)
Cover
Screw
Fig. 8.1
Protection Board
Fig. 8.2
3. Connect the u-lugs to the terminals
Match the wire colors/labels with the labels on
the terminal block and rmly screw the u-lug
of each wire to its corresponding terminal.
4. Clamp down the cable with the designated
cable clamp.
5. Insulate unused wires with electrical tape.
Keep them away from any electrical or metal
parts.
6. Reinstall the cover of the electric control box.
Indoor Unit Wiring
1. Prepare the cable for connection
a. Using wire strippers, strip the rubber jacket
from both ends of a signal cable to reveal
about 15cm (5.9”) of the wires inside.
b. Strip the insulation from the ends of the
wires.
c. Using a wire crimper, crimp the u-lugs to
the ends of the wires.
2. Open the front panel of the indoor unit. Using
a screwdriver,remove the cover of the electric
control box on your indoor unit.
3. Thread the power cable and the signal cable
through the wire outlet.
4. Connect the u-lugs to the terminals.
Match the wire colors/labels with the labels on
the terminal block and firmly screw the u-lug
of each wire to its corresponding terminal.
Refer to the Serial Number and Wiring Diagram
located on the cover of the electric control box.
Connective wiring diagram
Wiring diagram
Fig. 8.3
control box
wire outlet
Table 8.2: Other Regions
Rated Current of
Appliance (A)
Area (mm²)
Nominal Cross-Sectional
≤ 6 0.75
6 - 10 1
10 - 16 1.5
16 - 25 2.5
25- 32 4
32 - 45 6
Fig. 8.4
Magnetic ring
(if supplied and packed with the accessories)
1 2 3
Pass the belt through
the hole of the Magnetic
ring to fix it on the cable
Page 24
Wiring
Power Specifications
NOTE: Electric auxiliary heating type circuit breaker/fuse need to add more than 10 A.
Indoor Power Supply Specifications
MODEL
(Btu/h)
≤18K 19K~24K 25K~36K 37K~48K 49K~60K
POWER
PHASE 1 Phase 1 Phase 1 Phase 1 Phase 1 Phase
FREQUENCY
AND VOLT
208-240V 208-240V 208-240V 208-240V 208-240V
CIRCUIT BREAKER/
FUSE(A)
25/20 32/25 50/40 70/55 70/60
MODEL
(Btu/h)
≤36K 37K~60K ≤36K 37K~60K
POWER
PHASE 3 Phase 3 Phase 3 Phase 3 Phase
FREQUENCY
AND VOLT
380-420V 380-420V 208-240V 208-240V
CIRCUIT BREAKER/FUSE(A) 25/20 32/25 32/25 45/35
MODEL
(Btu/h)
≤18K 19K~24K 25K~36K 37K~48K 49K~60K
POWER
PHASE 1 Phase 1 Phase 1 Phase 1 Phase 1 Phase
FREQUENCY
AND VOLT
208-240V 208-240V 208-240V 208-240V 208-240V
CIRCUIT BREAKER/
FUSE(A)
25/20 32/25 50/40 70/55 70/60
MODEL
(Btu/h)
≤36K 37K~60K ≤36K 37K~60K
POWER
PHASE 3 Phase 3 Phase 3 Phase 3 Phase
FREQUENCY
AND VOLT
380-420V 380-420V 208-240V 208-240V
CIRCUIT BREAKER/FUSE(A) 25/20 32/25 32/25 45/35
Outdoor Power Supply Specifications
CAUTION
• While connecting the wires, please strictly follow the wiring diagram.
• The refrigerant circuit can become very hot. Keep the interconnection cable away from the
copper tube.
5. Clamp down the cable with the designated cable clamp to secure it in place. The cable should not
be loose and should not pull on the u-lugs.
6. Reattach the electric box cover.
Page 25
Wiring
MODEL
(Btu/h)
≤18K 19K~24K 25K~36K 37K~48K 49K~60K
POWER
(indoor)
PHASE 1 Phase 1 Phase 1 Phase 1 Phase 1 Phase
FREQUENCY
AND VOLT
220-240V 220-240V 220-240V220-240V 220-240V
CIRCUIT BREAKER/
FUSE(A)
15/10 15/10 15/10 15/10 15/10
POWER
(outdoor)
PHASE 1 Phase 1 Phase 1 Phase 1 Phase 1 Phase
FREQUENCY
AND VOLT
208-240V 208-240V 208-240V
208-240V
208-240V
CIRCUIT BREAKER/
FUSE(A)
25/20 25/20 40/30 50/40 50/40
MODEL
(Btu/h)
≤36K 37K~60K ≤36K 37K~60K
POWER
(indoor)
PHASE 1 Phase 1 Phase 1 Phase 1 Phase
FREQUENCY
AND VOLT
208-240V 208-240V 208-240V 208-240V
CIRCUIT BREAKER/FUSE(A) 15/10 15/10 15/10 15/10
POWER
(outdoor)
PHASE 3 Phase 3 Phase 3 Phase 3 Phase
FREQUENCY
AND VOLT
380-420V 380-420V 208-240V 208-240V
CIRCUIT BREAKER/FUSE(A) 25/20 32/25 32/25 45/35
MODEL
(Btu/h)
≤36K 37K~60K ≤36K 37K~60K
POWER
(indoor)
PHASE 1 Phase 1 Phase 1 Phase 1 Phase
FREQUENCY
AND VOLT
220-240V 220-240V 220-240V 220-240V
CIRCUIT BREAKER/FUSE(A) 15/10 15/10 15/10 15/10
POWER
(outdoor)
PHASE 3 Phase 3 Phase 3 Phase 3 Phase
FREQUENCY
AND VOLT
380-420V 380-420V 208-240V 208-240V
CIRCUIT BREAKER/FUSE(A) 25/20 32/25 32/25 40/30
Inverter Type A/C Power Specifications
Independent Power Supply Specifications
MODEL
(Btu/h)
≤18K 19K~24K 25K~36K 37K~48K 49K~60K
POWER
(indoor)
PHASE 1 Phase 1 Phase 1 Phase 1 Phase 1 Phase
FREQUENCY
AND VOLT
208-240V 208-240V 208-240V208-240V 208-240V
CIRCUIT BREAKER/
FUSE(A)
15/10 15/10 15/10 15/10 15/10
POWER
(outdoor)
PHASE 1 Phase 1 Phase 1 Phase 1 Phase 1 Phase
FREQUENCY
AND VOLT
208-240V 208-240V 208-240V
208-240V
208-240V
CIRCUIT BREAKER/
FUSE(A)
25/20 32/25 50/40 70/55 70/60
Page 26
Air Evacuation
Air Evacuation
Safety Precautions
CAUTION
• Use a vacuum pump with a gauge reading
lower than -0.1MPa and an air discharge
capacity above 40L/min.
• The outdoor unit does not need vacuuming.
DO NOT open the outdoor unit’s gas and
liquid stop valves.
• Ensure that the Compound Meter reads
-0.1MPa or below after 2 hours. If after
three hours of operation and the gauge
reading is still above -0.1MPa, check if there
is a gas leak or water inside the pipe. If
there is no leakage, perform another
evacuation for 1 or 2 hours.
• DO NOT use refrigerant gas to evacuate the
system.
Evacuation Instructions
Before using a manifold gauge and a vacuum
pump, read their operation manuals to make
sure you know how to use them properly.
Manifold Gauge
Compound gauge
-76cmHg
Low pressure valve
High pressure valve
Charge hose
Charge hose
Vacuum pump
Pressure gauge
Low pressure valve
Fig. 9.1
1. Connect the manifold gauge’s charge hose
to the service port on the outdoor unit’s low
pressure valve.
2. Connect the manifold gauge’s charge hose
from the to the vacuum pump.
3. Open the Low Pressure side of the manifold
gauge.Keep the High Pressure side closed.
4. Turn on the vacuum pump to evacuate the
system.
5. Run the vacuum for at least 15 minutes, or
until the Compound Meter reads -76cmHG
(-1x105Pa).
6. Close the manifold gauge’s Low Pressure valve
and turn o the vacuum pump.
7. Wait for 5 minutes, then check that there has
been no change in system pressure.
NOTE: If there is no change in system pressure,
unscrew the cap from the packed valve (high
pressure valve). If there is a change in system
pressure, there may be a gas leak.
8. Insert hexagonal wrench into the packed valve
(high pressure valve) and open the valve by
turning the wrench 1/4 counterclockwise.
Listen for gas to exit the system, then close the
valve after 5 seconds.
Flare nut
Cap
Valve body
Valve stem
Fig. 9.2
9. Watch the Pressure Gauge for one minute to
make sure that there is no change in pressure. It
should read slightly higher than the atmospheric
pressure.
10.Remove the charge hose from the service port.
11.Using hexagonal wrench, fully open both the
high pressure and low pressure valves.
OPEN VALVE STEMS GENTLY
When opening valve stems, turn the hexagonal
wrench until it hits against the stopper. DO NOT
try to force the valve to open further.
12. Tighten valve caps by hand, then tighten it
using the proper tool.
9
Page 27
Air Evacuation
Note On Adding Refrigerant
CAUTION
• Refrigerant charging must be performed after wiring, vacuuming, and the leak testing.
• DO NOT exceed the maximum allowable quantity of refrigerant or overcharge the system.
Doing so can damage the unit or impact it’s functioning.
• Charging with unsuitable substances may cause explosions or accidents. Ensure that the
appropriate refrigerant is used.
• Refrigerant containers must be opened slowly. Always use protective gear when charging the
system.
• For the R290 or R32 refrigerant model, make sure the condtions within the area have been
made safe by control of ammable material when the refrigerant added into air conditioner.
• The maximum refrigerant charge amount of R32 is 305 grams.
• DO NOT mix refrigerants types.
Some systems require additional charging depending on pipe lengths. The standard pipe length
varies according to local regulations. For example, in North America, the standard pipe length is
7.5m (25’) In other areas, the standard pipe length is 5m (16‘). The additional refrigerant to be
charged can be calculated using the following formula:
Liquid Side Diameter
R32 :
(Total pipe length standard pipe length)x
12g(0.13oZ)/m(ft)
(Total pipe length standard pipe length)x
24g(0.26oZ)/m(ft)
(Total pipe length standard pipe length)x
40g(0.42oZ)/m(ft)
φ6.35(1/4”) φ9.52(3/8”) φ12.7(1/2”)
R22
(orifice tube in the indoor unit):
(Total pipe length standard pipe length)x
30g (0.32oZ)/m(ft)
(Total pipe length standard pipe length)x
65g(0.69oZ)/m(ft)
(Total pipe length standard pipe length)x
115g(1.23oZ)/m(ft)
R22
(orifice tube in the outdoor unit):
(Total pipe length standard pipe length)
x15g(0.16oZ)/m(ft)
(Total pipe length standard pipe length)
x30(0.32oZ)/m(ft)
(Total pipe length -
standard pipe length)
x60g(0.64oZ)/m(ft)
(Total pipe length -
standard pipe length)
x65g(0.69oZ)/m(ft)
R410A:
(orifice tube in the indoor unit):
(Total pipe length standard pipe length)
x30g(0.32oZ)/m(ft)
(Total pipe length standard pipe length)
x65g(0.69oZ)/m(ft)
(Total pipe length standard pipe length)
x115g(1.23oZ)/m(ft)
R410A:
(orifice tube in the outdoor unit):
(Total pipe length standard pipe length)
x15g(0.16oZ)/m(ft)
(Total pipe length standard pipe length)
x30g(0.32oZ)/m(ft)
Page 28
Test Run
Before Test Run
A test run must be performed after the entire
system has been completely installed. Confirm
the following points before performing the test:
a) Indoor and outdoor units are properly
installed.
b) Piping and wiring are properly connected.
c)
No obstacles near the inlet and outlet of
the unit that might cause poor performance
or product malfunction.
d) Refrigeration system does not leak.
e) Drainage system is unimpeded and
draining to a safe location.
f) Heating insulation is properly installed.
g) Grounding wires are properly connected.
h) Length of the piping and additional
refrigerant stow capacity have been
recorded.
i) Power voltage is the correct voltage
for the air conditioner.
CAUTION
Failure to perform the test run may result in unit
damage, property damage, or personal injury.
Test Run Instructions
1. Open both the liquid and gas stop valves.
2. Turn on the main power switch and allow the
unit to warm up.
3. Set the air conditioner to COOL mode.
4. For the Indoor Unit
a. Ensure the remote control and its buttons
work properly.
b. Ensure the louvers move properly and can
be changed using the remote control.
c. Double check to see if the room
temperature is being registered correctly.
d. Ensure the indicators on the remote
control and the display panel on the indoor
unit work properly.
e. Ensure the manual buttons on the indoor
unit works properly.
f. Check to see that the drainage system is
unimpeded and draining smoothly.
g. Ensure there is no vibration or abnormal
noise during operation.
5. For the Outdoor Unit
a. Check to see if the refrigeration system is
leaking.
b. Make sure there is no vibration or
abnormal noise during operation.
c. Ensure the wind, noise, and water
generated by the unit do not disturb your
neighbors or pose a safety hazard.
6. Drainage Test
a. Ensure the drainpipe flows smoothly. New
buildings should perform this test before
finishing the ceiling.
b. Remove the test cover. Add 2,000ml of
water to the tank through the attached
tube.
c. Turn on the main power switch and run
the air conditioner in COOL mode.
d. Listen to the sound of the drain pump to
see if it makes any unusual noises.
e. Check to see that the water is discharged.
It may take up to one minute before the
unit begins to drain depending on the
drainpipe.
f. Make sure that there are no leaks in any of
the piping.
g. Stop the air conditioner. Turn o the main
power switch and reinstall the test cover.
NOTE: If the unit malfunctions or does not
operate according to your expectations, please
refer to the Troubleshooting section of the
Owner’s Manual before calling customer service.
Test Run
10
Page 29
European Disposal
Guidelines
11
Users in European Countries may be required to properly dispose of this unit. This appliance contains
refrigerant and other potentially hazardous materials. When disposing of this appliance, the law
requires special collection and treatment.
DO NOT
dispose of this product as household waste or
unsorted municipal waste.
When disposing of this appliance, you have the following options:
• Dispose of the appliance at designated municipal electronic waste collection facility.
• When buying a new appliance, the retailer will take back the old appliance free of charge.
• The manufacturer will also take back the old appliance free of charge.
• Sell the appliance to certified scrap metal dealers.
NOTE: Disposing of this appliance in the forest or other natural surroundings endangers your health
and is bad for the environment. Hazardous substances may leak into the ground water and enter
the food chain.
European Disposal Guidelines
Page 30
12
1. Checks to the area
3. General work area
4. Checking for presence of refrigerant
5. Presence of re extinguisher
If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate
fire extinguishing equipment shall be available to hand. Have a dry power or CO2 fire extinguisher
adjacent to the charging area.
7. Ventilated area
Ensure that the area is in the open or that it it adequately ventilated before breaking into the system
or conducting any hot work. A degree of ventilation shall continue during the period that the work is
carried out. The ventilation should safely disperse any released refrigerant and preferably expel it
externally into the atmosphere.
8. Checks to the refrigeration equipment
Where electrical components are being changed, they shall be fit for the purpose and to the correct
specification. At all times the manufacturer s maintenance and service guidelines shall be followed.
If in doubt consult the manufacturer s technical department for assistance. The following checks shall
be applied to installations using flammable refrigerants:
6. No ignition sources
No person carrying out work in relation to a refrigeration system which involves exposing any pipe
work that contains or has contained flammable refrigerant shall use any sources of ignition in such a
manner that it may lead to the risk of fire or explosion. All possible ignition sources, including cigarette
smoking, should be kept sufficiently far away from the site of installation, repairing, removing and
disposal, during which flammable refrigerant can possibly be released to the surrounding space. Prior
to work taking place, the area around the equipment is to be surveyed to make sure that there are
no flammable hazards or ignition risks. NO SMOKING signs shall be displayed.
2. Work procedure
All mintenance staff and others working in the local area shall be instructed on the nature of work
being carried out. work in confined sapces shall be avoided. The area around the work space shall
be sectioned off. Ensure that the conditions within the area have been made safe by control of
flammable material.
Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary
to ensure that the risk of ignition is minimised. For repair to the refrigerating system, the following
precautions shall be complied with prior to conducting work on the system.
Works shall be undertaken under a controlled procedure so as to minimise the risk of a
flammable gas or vapour being present while the work is being performed.
The area shall be checked with an appropriate refrigerant detector prior to and during work,
to ensure the technician is aware of potentially flammable atmospheres. Ensure that the leak
detection equipment being used is suitable for use with flammable refrigerants, i.e. no sparking,
adequately sealed or intrinsically safe.
,,
,,
,
,
Information
Servicing
Information Servicing
(Required for the units adopt R32/R290 Refrigerant only)
Page 31
Information
Servicing
,
9. Checks to electrical devices
10. Repairs to sealed components
the charge size is in accordance with the room size within which the refrigerant containing
parts are installed;
the ventilation machinery and outlets are operating adequately and are not obstructed;
if an indirect refrigerating circuit is being used, the secondary circuits shall be checked
for the presence of refrigerant; marking to the equipment continues to be visible and
legible.
marking and signs that are illegible shall be corrected;
refrigeration pipe or components are installed in a position where they are unlikely to be
exposed to any substance which may corrode refrigerant containing components, unless
the components are constructed of materials which are inherently resistant to being
corroded or are suitably protected against being so corroded.
Repair and maintenance to electrical components shall include initial safety checks and
component inspection procedures. If a fault exists that could compromise safety, then no
electrical supply shall be connected to the circuit until it is satisfactorily dealt with. If the fault
cannot be corrected immediately but it is necessary to continue operation, and adequate
temporary solution shall be used. This shall be reported to the owner of the equipment so all
parties are advised.
Initial safety checks shall include:
that capacitors are discharged: this shall be done in a safe manner to avoid possibility of
sparking
that there no live electrical components and wiring are exposed while charging, recovering
or purging the system;
that there is continuity of earth bonding.
10.1 During repairs to sealed components, all electrical supplies shall be disconnected from the
equipment being worked upon prior to any removal of sealed covers, etc. If it is absolutely
necessary to have an electrical supply to equipment during servicing, then a permanently
operating form of leak detection shall be located at the most critical point to warn of a
potentially hazardous situation.
10.2 Particular attention shall be paid to the following to ensure that by working on electrical
components, the casing is not altered in such a way that the level of protection is affected.
This shall include damage to cables, excessive number of connections, terminals not made
to original specification, damage to seals, incorrect fitting of glands, etc.
Ensure that apparatus is mounted securely.
Ensure that seals or sealing materials have not degraded such that they no longer serve
the purpose of preventing the ingress of flammable atmospheres. Replacement parts shall
be in accordance with the manufacturer s specifications.
NOTE: The use of silicon sealant may inhibit the effectiveness of some types of leak detection
equipment. Instrinsically safe components do not have to be isolated prior to working on them.
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11. Repair to intrinsically safe components
Do not apply any permanent inductive or capacitance loads to the circuit without ensuring
that this will not exceed the permissible voltage and current permitted for the equipment in
use. Intrinscially safe components are the only types that can be worked on while live in the
presence of a flammable atmosphere. The test apparatus shall be at the correct rating.
Replace components only with parts specified by the manufacturer. Other parts may result
in the ignition of refrigerant in the atmosphere from a leak.
12. Cabling
Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp
edges or any other adverse environmental effects. The check shall also take into account the
effects of aging or continual vibration from sources such as compressors or fans.
15. Removal and evacuation
When breaking into the refrigerant circuit to make repairs of for any other purpose
conventional procedures shall be used, However, it is important that best practice is followed
since flammability is a consideration. The following procedure shall be adhered to:
remove refrigerant;
purge the circuit with inert gas;
evacuate;
purge again with inert gas;
open the circuit by cutting or brazing.
The refrigerant charge shall be recovered into the correct recovery cylinders. The system shall be
flushed with OFN to render the unit safe. This process may need to be repeated several times.
Compressed air or oxygen shall not be used for this task.
Flushing shall be achieved by breaking the vacuum in the system with OFN and continuing to
fill until the working pressure is achieved, then venting to atmosphere, and finally pulling down
to a vacuum. This process shall be repeated until no refrigerant is within the system.
13. Detection of ammable refrigerants
Under no circumstances shall potential sources of ignition be used in the searching for or
detection of refrigerant leaks. A halide torch(or any other detector using a naked flame)
shall not be used.
14. Leak detection methods
The following leak detection methods are deemed acceptable for systems containing flammable
refrigerants. Electronic leak detectors shall be used to detect flammable refrigerants, but the
sensitivity may not be adequate, or may need re-calibration.(Detection equipment shall be
calibrated in a refrigerant-free area.) Ensure that the detector is not a potential source of ignition
and is suitable for the refrigerant. Leak detection equipment shall be set at a percentage of the
LFL of the refrigerant and shall be calibrated to the refrigerant employed and the appropriate
percentage of gas (25% maximum) is confirmed. Leak detection fluids are suitable for use with
most refrigerants but the use of detergents containing chlorine shall be avoided as the chlorine
may react with the refrigerant and corrode the copper pipe-work.
If a leak is suspected ,all naked flames shall be removed or extinguished. If a leakage of refrigernat
is found which requires brazing, all of the refrigerant shall be recovered from the system, or
isolated(by means of shut off valves) in a part of the system remote from the leak . Oxygen free
nitrogen(OFN) shall then be purged through the system both before and during the brazing process.
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17. Decommissioning
Before carrying out this procedure, it is essential that the technician is completely familiar
with the equipment and all its detail. It is recommended good practice that all refrigerants
are recovered safely. Prior to the task being carried out, an oil and refrigerant sample shall
be taken.
In case analysis is required prior to re-use of reclaimed refrigerant. It is essential that
electrical power is available before the task is commenced.
a) Become familiar with the equipment and its operation.
b) Isolate system electrically
c) Before attempting the procedure ensure that:
mechanical handling equipment is available, if required, for handling refrigerant cylinders;
all personal protetive equipment is available and being used correctly;
the recovery process is supervised at all times by a competent person;
recovery equipment and cylinders conform to the appropriate standards.
d) Pump down refrigerant system, if possible.
e) If a vacuum is not possible, make a manifold so that refrigerant can be removed from
various parts of the system.
f) Make sure that cylinder is situated on the scales before recovery takes place.
g) Start the recovery machine and operate in accordance with manufacturer s instructions.
16. Charging procedures
In addition to conventional charging procedures, the following requirements shall be followed:
Ensure that contamination of different refrigerants does not occur when using charging
equipment. Hoses or lines shall be as short as possible to minimize the amount of
refrigerant contained in them.
Cylinders shall be kept upright.
Ensure that the refrigeration system is earthed prior to charging the system with refrigerant.
Label the system when charging is complete(if not already).
Extreme care shall be taken not to overfill the refrigeration system.
Prior to recharging the system it shall be pressure tested with OFN. The system shall be
leak tested on completion of charging but prior to commissioning. A follow up leak test
shall be carried out prior to leaving the site.
,
When the final OFN charge is used, the system shall be vented down to atmospheric pressure
to enable work to take place. This operation is absolutely vital if brazing operations on the
pipe-work are to take place.
Ensure that the outlet for the vacuum pump is not closed to any ignition sources and there
is ventilation available.
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18. Labelling
Equipment shall be labelled stating that it has been de-commissioned and emptied of
refrigerant. The label shall be dated and signed. Ensure that there are labels on the
equipment stating the equipment contains flammable refrigerant.
19. Recovery
When removing refrigerant from a system, either for service or decommissioning, it is
recommended good practice that all refrigerants are removed safely.
When tranferring refrigerant into cylinders, ensure that only appropriate refrigerant
recovery cylinders are employed. Ensure that the correct numbers of cylinders for holding
the total system charge are available. All cylinders to be used are designated for the
recovered refrigerant and labelled for that refrigerant(i.e special cylinders for the
recovery of refrigerant). Cylinders shall be complete with pressure relief valve and
associated shut-off valves in good working order.
Empty recovery cylinders are evacuated and, if possible, cooled before recovery occurs.
The recovery equipment shall be in good working order with a set of instructions
concerning the equipment that is at hand and shall be suitable for the recovery of
flammable refrigerants. In addition, a set of calibrated weighing scales shall be available
and in good working order.
Hoses shall be complete with leak-free disconnect couplings and in good condition. Before
using the recovery machine, check that it is in satisfactory working order, has been
properly maintained and that any associated electrical components are sealed to prevent
ignition in the event of a refrigerant release. Consult manufacturer if in doubt.
The recovered refrigerant shall be returned to the refrigerant supplier in the correct
recovery cylinder, and the relevant Waste Transfer Note arranged. Do not mix refrigerants
in recovery units and especially not in cylinders.
If compressors or compressor oils are to be removed, ensure that they have been
evacuated to an acceptable level to make certain that flammable refrigerant does not
remain within the lubricant. The evacuation process shall be carried out prior to retruning
the compressor to the suppliers. Only electric heating to the compressor body shall be
employed to accelerate this process. When oil is drained from a system, it shall be carried
out safely.
h) Do not overfill cylinders. (No more than 80% volume liquid charge).
i) Do not exceed the maximum working pressure of the cylinder, even temporarily.
j) When the cylinders have been filled correctly and the process completed, make sure that
the cylinders and the equipment are removed from site promptly and all isolation valves
on the equipment are closed off.
k) Recovered refrigerant shall not be charged into another refrigeration system unless it has
been cleaned and checked.
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1. Transport of equipment containing ammable refrigerants
Compliance with the transport regulations
2. Marking of equipment using signs
Compliance with local regulations
3. Disposal of equipment using ammable refrigerants
Compliance with national regulations
4. Storage of equipment/appliances
The storage of equipment should be in accordance with the manufacturer’s instructions.
5. Storage of packed (unsold) equipment
Storage package protection should be constructed such that mechanical damage to the
equipment inside the package will not cause a leak of the refrigerant charge.
The maximum number of pieces of equipment permitted to be stored together will be
determined by local regulations.
20. Transportation, marking and storage for units
FLOOR/CEILING TYPE
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