Pioneer RAB Series User manual

DUCTED CONCEALED (CEILING RECESSED) MINI SPLIT SYSTEM
AIR CONDITIONER/HEAT PUMP
MEDIUM EXTERNAL STATIC PRESSURE TYPE
IMPORTANT NOTICE:
Please read this manual carefully before installing
or operating your new air conditioning system.
Be sure to save this manual for future reference.
Installation
Manual
RAB/RYB Series
RAB: Cooling Only Version
RYB Cooling and Heating Version
Inverter+ and Inverter++ Models
9,000-48,000 BTU/hr

If your indoor unit is a part of a MULTI-SPLIT system set, refer to the installation manual
that is packed with your outdoor unit as well.

Accessories.......................................................................05
a. Indoor Unit Parts.........................................................08
b. Indoor Unit Installation Instructions............09
Safety Precautions....................................................06
Outdoor Unit Installation....................................13
a. Outdoor Unit Installation Instructions..........13
b. Outdoor Unit Types and Specifications........14
c. Notes on Drilling Wall Hole....................................15
Drainpipe Installation...........................................16
Table of Contents
Installation Manual
Indoor Unit Installation.......................................08
Installation Overview............................................07
1
2
5
3
4
6

Page 3 
Refrigerant Piping Connection...............................18
A. Notes on Pipe Length and Elevation......................18
B. Refrigerant Piping Connection Instructions.....20
Wiring...................................................................23
a. Outdoor Unit Wiring.............................23
b. Indoor Unit Wiring.................................24
c. Power Specifications.............................26
Air Evacuation....................................................................28
a. Evacuation Instructions..............................................28
b. Note on Adding Refrigerant...................................29
Test Run.............................................................30
MC MC
7
8
9
10
L1 L2
Impedance Information 31
11 ..................

Page 5 
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.
Connecting Wire for Display (2m)
Cord Protection Rubber Ring
QUANTITY
SHAPE
NAME
Soundproof/Insulation Sheath 2
1
1
1
Tubing & Fittings
Others
Installation Manual
Transfer Connector (Φ12.7-Φ15.9)/
( )(Packed with the indoor unit )
NOTE: Pipe size may dier from appliance to
appliance. To meet dierent pipe size requirements,
sometimes the pipe connections need a transfer
connector installed on the outdoor unit .
Transfer Connector (Φ6.35-Φ9.52)/
( )(Packed with the indoor unit)
NOTE: Pipe size may dier from appliance to
appliance. To meet dierent pipe size requirements,
sometimes the pipe connections need a transfer
connector installed on the outdoor unit .
Transfer Connector (Φ9.52-Φ12.7)/
( ) (Packed with the indoor unit,
used for multi-type models only )
NOTE: Pipe size may dier from appliance to
appliance. To meet dierent pipe size requirements,
sometimes the pipe connections need a transfer
connector installed on the outdoor unit .
1
Owner‘s Manual
Drain Joint (some models)
Seal Ring (some models)
Drainpipe Fittings
(for cooling & heating)
Seal Sponge (some models)
EMC Magnetic Ring
(some models)
Magnetic Ring
(wrap the electric wires S1 & S2 ( P & Q & E )
around the magnetic ring twice)
Magnetic Ring
(Hitch on the connective cable between the indoor
unit and outdoor unit after installation.)
1
1
Orice (some models) 1
Φ0.5in-Φ0.63in
Φ0.25in-Φ0.375in
Φ0.375in-Φ0.5in
1
(on some models)
1
(on some models)
1
(on some models)
1(on some models)
1(on some models)
1
Optional accessories
There are two types of remote controls: wired and wireless.
Select a remote controller based on customer preferences and requirements, and install in an
appropriate place.
Refer to catalogues and technical literature for guidance on selecting a suitable remote controller.
•
S1&S2(P&Q&E)
Display Panel
*For testing purposes only
1(on some models-
KJR-120G,KJR-120H)

Safety Precautions 2
Read and Understand Safety Precautions Prior to Installation
Improper installation due to negligence of instructions may result in serious damage or injury.
The magnitude of potential damages or injuries is classified as either a WARNING or a CAUTION.
WARNING
• Read the Safety Precautions carefully before installation.
• In certain functional environments, such as kitchens, server rooms, etc., the use of specially
designed air-conditioning units is highly recommended.
• Only trained and certied technicians should install, repair, and service this air
conditioning unit.
• Attempts to self-install can lead to inecient performance, and risk of equipment damage over
time.
• 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 aect
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.
Note about Fluorinated Gases
1.
This air-conditioning unit contains fluorinated gases. 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.
Failure to observe a warning may result in death. The product must be installed by
installers or contractors who are licensed HVAC professionals and in compliance with
all local, state, and provincial laws.
Failure to observe a caution may result in injury or equipment damage.
WARNING
CAUTION
Page 6 

Installation Overview 3
Unit Installation
Overview
L1 L2
123
4
5
MC MC
6
7
Install the Indoor Unit
(Page 8)
INSTALLATION ORDER
Install the Outdoor Unit
(Page 13)
Install the Drainpipe
(Page 15)
Evacuate the Refrigeration System
(Page 26)
Connect the Wires
(Page 23)
Connect the Refrigerant Pipes
(Page 18)
Perform a Test Run
(Page 28)
Page 7 

Indoor Unit Installation 4
Indoor Unit
Installation
Indoor Unit Parts
Fig. 4.1
WARNING
• Securely install the indoor unit on a structure
that can sustain its weight. If the structure is
too weak, the unit may fall, causing personal
injury, unit and property damage, or even
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
or radios, to prevent static or image
distortion. Depending on the appliances, a
1m (3.2’) distance may not be sufficient.
• If the indoor unit is installed on a metal
part of the building, it must be grounded.
Indoor Unit Installation Instructions
Step 1: Select installation location
The indoor unit should be installed in a location
that meets the following requirements:
 Enough room for installation and maintenance.
Enough room for the connecting 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 impeded.
The airflow can fill the entire room.
There is no direct radiation from heaters.
CAUTION
DO NOT install the unit in the following
locations:
Where oil drilling or fracking is taking place.
Coastal areas with high salt content in the air
Near geothermal activity and corrosive gas
Buildings that may experience power
uctuations
Enclosed spaces
Areas with strong electromagnetic waves
Areas that store ammable materials or gas
Rooms with high humidity, such as
bathrooms or laundry rooms
Air Outlet
Air Inlet
Air filter(on selected models)
Drain hose
Electric control cabinet
Refrigerant connecting pipe
√
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Safety Precautions
Page 8 
It is an embeded installation.
√
Models with a cooling capacity of 9000 BTU to
18000 BTU are only applicable to one room.
√

Indoor Unit
Installation
Air Outlet
Air Inlet
Step 2: Hang the Indoor Unit.
1. Please refer to the following diagrams to locate the four positioning screw bolt holes on the
ceiling. Be sure to mark the places where you will drill ceiling hook holes.
Maintenance Space
Installation Location
Left
Side
Right
Side
Strong, durable ceiling
Indoor Unit
>4in (10cm) >12in (30cm)
>0.8in (2cm)
>3/4 in(2cm)
>11.8in (30cm)
> 8’ (250cm)
Floor
Service Access Ceiling
(When no ceiling)
B
Fig. 4.2
Air Outlet dimensions
Page 9 
>(20cm)
8 in 12in
24inx24in (60cmx60cm)
inspection opening
>(30cm)

Fig. 4.3
Air Filter
Descending Ventilation Opening and Mounted Hook
Air Filter
Electric Control Box
Table.4-1 (unit: mm/inch)
MODEL
(Btu/h)
Outline dimension
ABC
Air Outlet Opening size
DEF
Air Return Opening size
Size of Mounted Lug
I J G H
18K 210/8.3 674/26.5880/34.6
24K 249/9.8 774/30.51100/43.3
30K~36K 249/9.8 774/30.51360/53.5
36K~60K 300/11.8 874/34.41200/47.2
136/5.4 706/27.8600/23.6
175/6.9 926/36.5700/27.6
175/6.9 1186/46.7700/27.6
227/8.9 1044/41.1800/31.5
190/7.5
228/8.9
228/8.9
280/11
920/36.2782/30.8
1140/44.91001/39.4
1400/55.11261/49.6
1240/48.81101/43.3
508/20
598/23.5
598/23.5
697/27.4
9K/12K 200/7.9 506/19.9700/27.6 152/6 537/21.1450/17.7 186/7.3 741/29.2599/23.6
360/14.2
Indoor Unit
Installation
Fig. 4.6 Fig. 4.7
Original Concrete Bricks
Use an embedding screw bolt, crock, and stick
harness. (See Fig. 4.6)
Steel Roof Beam Structure
Install and use the steel supporting angle.
(See Fig. 4.7)
Fig. 4.4
Wood
Place the wood mounting across the roof beam,
then install the hanging screw bolts. (See Fig. 4.4)
Wood Mounting
Roof Beam
Hanging Screw Bolts
Ceiling Fig. 4.5
New Concrete Bricks
Inlay or embed the screw bolts. (See Fig. 4.5)
(Blade shape insertion) (Slide insertion)
Steel Bar
Embedding Screw Bolt
(Pipe Hanging and Embedding Screw Bolt)
Hanging Screw bolt
Hanging
Bolts
Steel
Supporting Angle
Page 10 
Air Inlet dimensions

Indoor Unit
Installation
Fig. 4.10
Step 3: Duct and Accessories Installation
NOTE: 1. Do not place the connecting duct
weight onto the indoor unit.
2. When connecting the duct, use a
nonammable canvas tie-in, to prevent
vibrating.
3. Insulation foam must be wrapped outside the
duct to avoid condensate. An internal duct
underlayer can be added to reduce noise,
if the end-user requires.
1. Install the lter (optional), according to the size
of the air inlet.
5. Refer to the following static pressure guidelines
when installing the indoor unit.
Change the fan motor static pressure
according to external duct static pressure.
2. Install the canvas tie-in between the body and
the duct.
3. The air inlet and air outlet duct should be far
enough apart to a avoid air passage
short-circuiting.
4. Connect the duct according to the following
diagram: Canvas Tie-In Canvas Tie-In
Air Outlet
Isolation Booth
Isolation booth
Checking Orice
Air Inlet
Air Dust Filter
Table.4-2
MODEL
(Btu/h)
Static Pressure
(Pa/in.wg)
0~100/0~3/8
18K
0~160/0~5/8
24K
0~160/0~5/8
30K~36K
0~160/0~5/8
42K~60K
0~50/0~1/4
9K
0~50/0~1/4
12K
Cut o the roof beam.
Strengthen the point at which the cut
was made. Consolidate the roof beam.
Fig. 4.9
Screw Nut
Washer
Hanging Screw Bolt
Overhang Part
Shockproof Cushion
NOTE: Conrm the minimum drain tilt is 1/100
or more.
CAUTION
The unit body must be completely aligned with
the hole. Ensure that the unit and the hole are
the same size before moving on.
2. Install and t pipes and wires after you have
nished installing the main body.When
choosing where to start, determine the
direction of the pipes to be drawn out.
Especially in cases where there is a ceiling
involved, align the refrigerant pipes, drain
pipes, and indoor and outdoor lines with their
connection points before mounting the unit.
3. Install hanging screw bolts.
4. After you select an installation location, align
the refrigerant pipes, drain pipes, as well as
indoor and outdoor wires, with their
connection points, before mounting the unit.
5. Drill 4 holes 10 cm (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 washers and nuts
provided.
7. Install the four suspension bolts.
8. Mount the indoor unit, with at least two
people to lift and secure it. Insert suspension
bolts into the unit’s hanging holes. Fasten
them using the washers and nuts provided.
(See Fig. 4.8).
9. Mount the indoor unit onto the hanging
screw bolts with a block. Position the
indoor unit atly, using a level indicator to
prevent leaks. (See Fig. 4.9).
Fig. 4.8
Page 11 

Indoor Unit
Installation
Step 4: Adjust the air inlet direction
(from rear side to under-side).
1. Take o the ventilation panel and ange.
2. Change the mounting positions of the
ventilation panel and air return ange.
Air Return Flange
Ventilation Panel
3. When installing the lter mesh, t it into the
ange, as illustrated in the following gure.
NOTE: All gures in this manual are for
explanatory purposes only. The air conditioner
you have purchased may slightly dier in
design, though it remains similar in shape.
Step 5: Fresh air duct installation
Dimension : Duct Joint for fresh air
Ø125mm(5”) Ø160mm (6-1/4”)
MODEL
18-60
Step 6: Motor and drain pump maintenance
Motor Maintenance:
Take o the ventilated panel.
Take o the blower housing.
Take o the motor.
1.
2.
3.
(The rear ventilated panel is used as an example)
Motor
Blower Housing
Ventilated Panel
Pump Maintenance:
Remove four screws from the drain pump.
Unplug the pump power supply and water
level switch cable.
Detach the pump.
1.
2.
3.
Pump
Fig. 4.11
Fig. 4.12
Fig. 4.13
Fig. 4.14
Fig. 4.15
Fig. 4.16
Air Return Flange
Ventilation panel
Page 12 

Outdoor Unit Installation
Outdoor Unit Installation Instructions
Step 1: Select Installation Location.
The outdoor unit should be installed in a
location that meets the following requirements:
The location is as close to the indoor unit as
possible.
Ensure that there is enough room for
installation and maintenance.
The air inlet and outlet are not
obstructed, or exposed to strong wind.
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 is 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
will be exposed to direct sunshine.
If possible, make sure the unit is located far
away from the property of neighbors, so that
the unit noise will not cause disturbances.
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 Winds
Strong Winds
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.
• Refer to Length Specications
to ensure there is enough room
for installation and maintenance.
Fig. 5.3
Outdoor Unit Installation
5
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Page 13 

Outdoor Unit
Installation
Table 5.1: Length Specications of Split
Type Outdoor Unit (unit: mm/inch)
Split Type Outdoor Unit
(Refer to Fig 5.4, 5.5, 5.6, 5.10 and Table 5.1)
Fig. 5.6
Fig. 5.5
A
B
D
W
H
W
H
Fig. 5.4
Page 14 
Outdoor Unit Dimensions
W x H x D
Mounting Dimensions
Distance A Distance B
770x555x300 (30.3x21.9x11.8) 549 (21.6) 325 (12.8)
946 x810x410 (37.24x31.9x16.14) 673 (26.5) 403 (15.87)
952 x1333x415 (37.5x52.5x16.34) 634 (24.96) 404 (15.9)
845x702x363 (33.27x27.6x14.3) 540 (21.26) 350 (13.8)
800x554x333 (31.5x21.8x13.1) 514 (20.24) 340 (13.39)
YN048GMFI17RUD:
YN036GMFI17RUD:
946 x810x410 (37.24x31.9x16.14) 673 (26.5) 403 (15.87)
YN024GMFI22RPD:
YN018GMFI22RPD:
YN012GMFI22RPD:
YN009GMFI22RPD:

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 dimensions (M, N, P)
(See Fig. 5.10)
M
N
P
30 cm / 12” from back wall
If using brackets, 10cm / 4”
60 cm / 24” on right
60 cm / 24” above
30 cm / 12” on left
200 cm / 78” in front
Fig. 5.10
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 Wall Hole
You must drill a hole into 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
into the wall.
NOTE: When drilling the wall hole, be
sure to avoid wires, plumbing, and other
sensitive components.
3. Place the protective wall cu into the hole.
This protects the edges of the hole, and will
help seal it when you nish the installation
process.
Outdoor Unit Installation
Fig. 5.11
L
H
300 cm / 118” or more
A
60 cm / 24”
or more
150 cm / 5’
or more
25 cm / 10”
or more
25 cm / 10”
or more
Rows of Series Installation
L ≤H L ≤1/2H
LA
25 cm / 10” or more
1/2H < L ≤H 30 cm / 12” or more
L >H Cannot be installed
Table 5.3 The relations between H, A, and L
are as follows.
Drain Joint Installation
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 into place
facing the front side 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 into
place.
2. Connect a drain hose extension (not included)
to the drain joint, to redirect water from the
unit during heating mode.
Page 15 

Fig. 6.3
(39-59”)
(8”)
<20cm
(21.7”)
<55cm
Lean over 1/50
1-1.5m
Drainpipe installation, for units with a pump
Ceiling
0 - 75mm
(3”)
NOTE ON DRAINPIPE INSTALLATION
• When using an extended drainpipe, tighten
the indoor connection with an additional
protection tube. This prevents 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”).
• If the outlet of the drainpipe is higher than
the body’s pump joint, provide a lift pipe for
the exhaust outlet of the indoor unit. The
lift pipe must be installed no higher than
55cm (21.7”) from the ceiling board. the
distance between the unit and the lift pipe
must be less than 20cm (7.9”). Incorrect
installation could cause water to flow back
into the unit and flood.
The drainpipe is used to drain water away from
the unit. Improper installation may cause unit
and property damage.
CAUTION
• Insulate all piping to prevent condensation,
which could lead to water damage.
• If the drainpipe is bent, or installed
incorrectly, water may leak and cause a
water-level switch malfunction.
• 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.
• DO NOT pull on the drainpipe forcefully. This
could disconnect it and cause damage.
NOTE ON PURCHASING PIPES
Installation requires a polyethylene tube
(exterior diameter = 3.7-3.9cm, interior diameter
= 3.2cm), which can be obtained at your local
hardware store or dealer.
Indoor Drainpipe Installation
Install the drainpipe as illustrated in Figure 6.2.
1.
2.
Drainpipe
Connecting Port
Drain Hose
Pipe Clasp Insulation
Fig. 6.1
Drainpipe Installation
Fig. 6.2
6
Drainpipe
Installation
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.
(See Fig 6.1)
NOTE: When connecting multiple drainpipes,
install the pipes as illustrated in Fig 6.4.
(39-59”)
1-1.5m
Lean over 1/50
Ceiling
• To prevent air bubbles, keep the drain hose
level, or slightly tiled up (<75mm / 3”).
0-53cm
(20.8”)
≥10cm
(4”)
Fig. 6.4
Page 16 

Drainage Test
Check that the drainpipe is unhindered.
This test should be performed on newly built
houses, before the ceiling is paved.
Units WITH a Pump.
Units WITHOUT a Pump
1. Remove the test cover.
Fill the water pan with 2 liters of water.
2. Turn on the unit, in COOLING mode. You will
hear the drain pump work . Check whether the
water is discharged properly (a 1-minute lag
is possible, depending on the length of the
drain pipe), Check whether water leaks from
the joints.
3. Turn o the air conditioner, and put the cap
back on.
3. Using a 65-mm (2.5”) core drill, drill a hole into
the wall. Be sure that the hole is drilled at
a slightly downward angle, so that the outdoor
end of the hole is lower than the indoor end
by about 12-mm (0.5”). This will ensure proper
water drainage (See Fig. 6.5). Place the
protective wall cu into the hole. This protects
the edges of the hole, and will help seal it
once installation is completed.
Wall
IndoorOutdoor
≈ 12mm / 0.5 inch
Fig. 6.5
NOTE: When drilling the hole, be sure to
avoid wires, plumbing, and other sensitive
components.
4. Pass the drain hose through the wall hole.
Make sure the water drains to a safe location
where it will not cause water damage, or a
slipping hazard.
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 catch odors that might otherwise
come back into the house.
Drainpipe Installation
Test cap
Fig.6.7
Fig.6.8
C
L
O
S
E
D
O
P
E
N
C
L
O
S
E
D
O
P
E
N
Stow tube
Fig.6.6
Stow tube
Fill the water pan with 2 liters of water.
Check that the drainpipe is unhindered.
Page 17 

Refrigerant Piping Connection
Safety Precautions
WARNING
• All eld piping must be completed by a
licensed technician, and must comply with
all relevant 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 Models
Inverter Split
Ty pe
<15K 25/82 10/33
15K - <24K 30/100 20/66
24K - <36K 50/164 25/82
36K - 60K 65/213 30/100
Other Split Type
12K 15/49 8/26
18K-24K 25/82 15/49
30K-36K 30/98.4 20/66
42K-60K 50/164 30/100
7
Refrigerant Piping Connection
Page 18 

Fig. 7.2 Fig. 7.3
Refrigerant Piping Connection
Oil traps
CAUTION
•
When the indoor unit is installed higher than
the outdoor unit:
An oil trap should be installed every 10m
(32.8ft) of vertical suction line riser.
(See Fig. 7.2)
-If oil flows back into the outdoor unit’s
compressor, this might cause liquid
compression, or deterioration of oil return.
Oil traps in the rising gas piping can prevent
this.
CAUTION
The indoor unit is installed higher than the
outdoor unit
When the outdoor unit is installed higher than
the indoor unit:
-It is recommended that vertical suction risers
not be upsized. Proper oil return to the
compressor should be maintained with suction
gas velocity. If velocities drop below 7.6 m/s
(1500 fpm (feet per minute)), oil return will be
decreased. An oil trap should be installed every
6m (20ft) of vertical suction line riser.
(See Fig. 7.3)
The outdoor unit is installed higher than the
indoor unit
Page 19 
••

Pipe
Reamer
Point down
Fig. 7.5
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/50’ L1, L2
(farthest distance from
the line pipe branch)
10m/33’ L1-L2
Drop
Height
Drop height between
indoor and outdoor unit
20m/66’ H1
Drop height between
two indoor units
0.5m/1.5’ H2
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. Ensure that the pipe is cut at a perfect
90° angle. Refer to Fig. 7.4 for examples
of bad cuts.
Oblique Rough Warped
90°
Fig. 7.4
Step 2: Remove burrs
Burrs can aect the air-tight seal of the 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.
Refrigerant Piping Connection
Step 1: 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 bit
longer than the measured distance.
Page 20 