INVENTOR V7KI-18WiFiR/U7RS-18 User manual

• INSTALLATION MANUAL
• ΕΓΧΕΙΡΙΔΙΟ ΕΓΚΑΤΑΣΤΑΣΗΣ
• MANUAL DE INSTALARE
• INSTALLATIONSHANDBUCH
ENGLISH | ΕΛΛΗΝΙΚΑ | ROMANA | DEUTSCH
FLOOR/CEILING TYPE
AIR CONDITIONING SYSTEMS
MODELS:
V7KI-18WiFiR/U7RS-18
V7KI-24WiFiR/U7RS-24
V7KI-36WiFiR/U7RS-36
V7KI-50WiFiR/U7RT-50
V7KI-60WiFiR/U7RT-60

Table of Contents
Installation Manual
Accessories ..................................................... 04
Safety Precautions .......................................... 05
Installation Overview...................................... 08
Indoor Unit Installation ........................... 09
a. Indoor Unit Parts................................ 09
b. Indoor Unit Installation Instructions 10
Drainpipe Installation .............................17
Outdoor Unit Installation.................................. 11
a. Outdoor Unit Installation Instructions .......14
b. Outdoor Unit Types and Specications .....15
c. Notes on Drilling Hole in Wall......................16
1
4
6
5
2
3

MC MC
L N
Indoor Unit Installation ........................... 09
a. Indoor Unit Parts................................ 09
b. Indoor Unit Installation Instructions 10
Wiring ....................................................23
a. Outdoor Unit Wiring .....................23
b. Indoor Unit Wiring .........................24
c. Power Specications......................25
Refrigerant Piping Connection ................................. 19
A. Notes on Pipe Length and Elevation ................ 19
B. Refrigerant Piping Connection Instructions ..... 21
Air Evacuation.....................................................27
a. Evacuation Instructions...............................27
b. Note on Adding Refrigerant .......................28
Test Run.............................................................29
European Disposal Guidelines .......................30
Information servicing.......................................31
8
7
9
10
11
12
Caution: Risk of re
(R32/R290 refrigerant)

◄ Page 4 ►
Remote controller
Fixing screw for
remote controller
holder
Remote controller
holder
Manual
2
Name of Accessories
Q‘ty(pc) Shape
1
11
Name of Accessories
Q‘ty(pc) Shape
1
2
1
2
Battery
Outlet pipe sheath
Drain joint
Seal ring
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.)
S1&S2(P&Q&E)
Copper nut 2Varies
by model
1
1
Accessories
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.

◄ Page 5 ►
Remote controller
Fixing screw for
remote controller
holder
Remote controller
holder
Manual
2
Name of Accessories
Q‘ty(pc) Shape
1
11
Name of Accessories
Q‘ty(pc) Shape
1
2
1
2
Battery
Outlet pipe sheath
Drain joint
Seal ring
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.)
S1&S2(P&Q&E)
Copper nut 2Varies
by model
1
2
Safety Precautions
WARNING
CAUTION
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 classied 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
•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.
• Only trained and certied technidans should install, repair and service this air conditioning
unit.
Improper installation may result in electrical shock, short circuit, leaks, re or other damage to the
equipment and personal property.
• Strictly follow the installation instruct ions set forth in this manual.
Improper installation may result in electrical shock, short circuit, leaks, re or other damage to the
equipment.
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 accor-
dance with the wiring rules.
• 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. Refriger-
ant is both toxic and ammable and poses a serious health and safety risk.
• 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.

◄ Page 6 ►
WARNING
• The appliance shall be stored in a room without continuously operating ignition sources (for exam-
ple: 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.
• Compliance with national gas regulations shall be observed.
• Keep ventilation openings clear of obstruction.
• A warning that the appliance shall be stored in a well-ventilated area where the room size corre-
sponds to the room area as specied for operation.
• Any person who is involved with working on or breaking into a refrigerant circuit should hold a
current valid certicate from an industry-accredited assessment authority, which authorises their
competence to handle refrigerants safely in accordance with an industry recognised assessment
specication.
• 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 supervi-
sion 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 specied 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).
• Appliance shall be installed, operated and stored in a room with a oor area larger than X m2, instal-
lation 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.
Model (Btu/h) Amount of refrigerant
to be charged (kg)
maximum installation
height (m)
Minimum room area
(m2)
<30000 <2.048 1.8m 4
<30000 <2.048 0.6m 35
30000-48000 2.048-3.0 1.8m 8
30000-48000 2.048-3.0 0.6m 80
>48000 >3.0 1.8m 9
>48000 >3.0 0.6m 80

◄ Page 7 ►
Note about Fluorinated Gasses
1. This air-conditioning unit contains uorinated gasses. For specic 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 certied techni-
cian.
3. Product uninstallation and recycling must be performed by a certied 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.
Explanation of symbols displayed on the indoor unit or outdoor unia (applicable to
the unit adoptsR32/R290 Refrigerant only):
WARNING
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.
CAUTION This symbol shows that the operation manual should be read carefully.
CAUTION This symbol shows that a service personnel should be handling this
equipment with reference to the installation manual.
CAUTION
CAUTION This symbol shows that information is available such as the operating
manual or installation manual.

◄ Page 8 ►
3
Installation Overview
INSTALLATION ORDER
Install the indoor unit
(Page 10)
Evacuate the refrigeration
system (Page 27)
Install the outdoor unit
(Rage 14)
Connect the wires
(Page 24)
Perform a test run
(Page 29)
Install the drainpipe
(Page 17)
Connect the refrigerant
pipes (Page 19)
L N
123
4
5
MC MC
6
7

◄ Page 9 ►
4
Indoor Unit Installation
Indoor Unit Parts
Safety Precautions
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 and cause person-
al 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 1 m (3.2’) from televisions
and radios to prevent static or image distor-
tion. Depending on the appliances, a 1 m
(3.2’) distance may not be sucient.
• If the indoor unit is installed on metal, it must
be electrically grounded.
Installation part
Air outlet
Louver
grille
Air inlet Display panel

◄ Page 10 ►
Indoor Unit Installation Instructions
NOTE: Panel installation should be performed
after piping and wiring have been completed.
RECOMMENDED DISTANCES BETWEEN THE INDOOR UNIT
The distance between the mounted indoor unit should meet the specications illlustrated in
the following diagram. (See Fig. 4.2)
Step 1:Select installation location
The indoor unit should be installed in a loca-
tion 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 airow can ll the entire room.
☑ There is no direct radiation from heaters.
CAUTION
DO NOT install the unit in the following
locations:
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 ammable materials or gas
Rooms with high humidity, such as bathrooms
or laundry rooms
Fig. 4.2
≥35mm ≥35mm
≥1000mm
≥35mm

◄ Page 11 ►
Table 4.1: Indoor parts installation size
Fig. 4.3
Refrigerant pipe connection
(D. gas side)
A
D
E
Hook
C
B
Refrigerant pipe connection
(E. Liquid side)
Drain point
MODEL(Btu/h) Length of A
(mm/inch)
Length of B
(mm/inch)
Length of C
(mm/inch)
Length of D
(mm/inch)
Length of E
(mm/inch)
18K-24K 1068/42 675/26.6 235/9.3 983/38.7 220/8.7
30K~48K 1285/50.6 675/26.6 235/9.3 1200/47.2 220/8.7
36K~48K 1650/65 675/26.6 235/9.3 1565/61.6 220/8.7
60K 1650/65 675/26.6 235/9.3 1565/61.6 220/8.7

◄ Page 12 ►
Step 2:Hang indoor unit
Wood
Place the square timber traversely over the
roof beam, then install the hanging screw
bolts. (See Fig.4.4)
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 mount-
ing the machine.
3. The installation of hanging screw bolts.
• Cut o the roof beam.
• Strengthen the area at which the cut was made
and consolidate the roof beam.
4. After the selection of installation location, po-
sition 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).
New concrete bricks
Inlaying or embedding the screw bolts.
Original concrete bricks
Install the hanging hook with expansible bolt
into the concrete to a depth of 45~50mm to
prevent loosening.
Steel roof beam structure
Install and use the supporting angle steel
directly. (See Fig.4.8)
Fig. 4.4
Fig. 4.5
Fig. 4.6
Fig. 4.7
Fig. 4.8 Fig. 4.9
Timber over the beam
(Blade shape insertion) (Slide insertion)
Embedding screw bolt
(Pipe hanging and embedding screw bolt)
Steel bar
Hanging screw bolt
Supporting
angle steel
Hanging
bolts
Hanging screw bolts
Roof beam
Ceiling
CAUTION
The unit body should align perfectly
with the hole. Ensure that the unit
and the hole are the same size before
moving on.

◄ Page 13 ►
Ceiling Installation
Wall Mounting Installation
9. Remove the side board and the grille.
(See Fig. 4.10).
10. Mount the indoor unit onto the hanging
screw bolts with a block.
Position the indoor unit on a at level by us-
ing a level to prevent leaks.
(See Fig. 4.11).
Fig. 4.10
Fig. 4.12
Fig. 4.13
Fig. 4.14
Fig. 4.11
Hanging arm
20mm
Side board
Screw nut
Shockproof cushion
Washer
Hanging screw bolt
Overhang part
Grille
Hanging
screw bolt
D. Refrigerant pipe connection
(D.gas side)
E. Refrigerant pipe connection
(E. Liquid side)
Drain point
Downward slope between(1-2)/100
NOTE: Conrm the minimum drain tilt is
1/100 or more.

◄ Page 14 ►
5
Outdoor Unit Installation
Outdoor Unit Installation Instructions
Step 1: Select installation location.
The outdoor u nit should be installed In the lo-
cation that meets the following requirements:
☑ Place the outdoor unit as close to the in-
door unit as possible.
☑ Ensure that there is enough room for In-
stallation and maintenance.
☑ The air Inlet and outlet must not be ob-
structed or exposed to strong wind.
☑ Ensure the location of the unit will not be
subject to snowdrifts, accumu lation 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 sun light.
☑ If possible, make sure the u nit is located
far away from your neigh bors’ 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 again st the wall to shelter it from
the wind. If necessary, use an awning.
(See Fig. 5.1 & 5.2)
☑ In stall the Indoor and outdoor units, cables
and wires at least 1 meter from televisbns 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.
Step 2: Install outdoor unit.
Fix the outdoor unit with anchor bolts (M10)
Strong wind
Strong
wind
>60cm / 23.6”
Fix with bolts
Strong wind Fig. 5.1
Fig. 5.2
Fig. 5.3
CAUTION
• Be sure to remove any obstacles that may
block air circulation.
• Make sure you refer to Length Specications
to ensure there is enough room for installa-
tion and maintenance.

◄ Page 15 ►
Fig. 5.4
Fig. 5.5
Split Type Outdoor Unit
(Refer to Fig 5.4,5.5,5.6,5.10 and Table 5.1)
Table 5.1: Length Specications of Split
Type Outdoor Unit (unit: mm/inch)
Outdoor Unit Dimensions
WxHxD
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)
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)
845x702x363 (33.27x27.6x14.3) 540 (21.26) 350 (13.8)
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)
890x673x342 (35x26.5x13.46) 663 (26.1) 354 (13.94)
DB
H
H
Fig. 5.6
W
W

◄ Page 16 ►
NOTE: The minimum distance between the
outdoor unit and walls described in the instal-
lation 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)
NOTE: Make sure the water drains to a safe
location where it will not cause water damage
or a slipping hazard.
60 cm / 23.6” above
Base pan hole of
outdoor unit
Seal
Seal
Drain joint
A B
M
N
P
30 cm / 11.8” on left 60 cm / 23.6” on right
200 cm / 78” in front
300 cm / 118” or more
60 cm /59”
or more
150 cm /59”
or more
25 cm /9.8”
or more
25 cm /9.8”
or more
H
A
L
30 cm / 11.8” from back wall
Fig. 5.10
Fig. 5.11
Fig. 5.12
Rows of series installation
Table 5.3 The relations between H, A and L
are as follows.
L A
L≤H L < 1/2H 25 cm / 9.8" or more
1/2H < L < H 30 cm /11.8" or more
L>H Can not be installed
Drain Joint Installation
Notes On Drilling Hole In Wall
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.
You must drill a hole in the wall for the refriger-
ant piping, and the signal cable that will con-
nect the indoor and outdoor units.
1. Determine the location of the wall hole
based on the location of the outdoor unit.
2. Using a 65mm (2.5in) or 90mm (3.54in) 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 cuff in the hole.
This protects the edges of the hole and will
help seal it when you finish the installation
process.
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 includ-
ed) 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 includ-
ed) to the drain joint to redirect water from
the unit during heating mode.

◄ Page 17 ►
NOTE: When connecting multiple drainpipes,
install the pipes as shown in Fig 6.3.
Drain hose
≥10cm
(4”)
Pipe clasp Insulation
Drainpipe
connecting port
Downward
slope 1/100
1-1.5mm
(39-59”)
Fig. 6.1
Fig. 6.3
Fig. 6.2
The drainpipe is used to drain water from the
unit. Improper installation may cause unit and
property damage.
Indoor Drainpipe Installation
Install the drainpipe as shown in Figure 6.2.
1. Cover the drainpipe with heat insulation to
prevent condensation and leakage.
2. Attach the mouth of the drain hose to the
unit’s outlet pipe. Sheath the mouth of the
hose and clip it firmly with a pipe clasp.
(Fig 6.1)
6
Drainpipe Installation
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.
NOTE ON DRAINPIPE INSTALLATION
• When using an extended drainpipe, tighten
the indoor connection with an additional pro-
tection tube to prevent it from pulling loose.
• The drainpipe should slope downward at a
gradient of at least 1 /100 to prevent water
from owing 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
ow back into the unit and ood it.

◄ Page 18 ►
3. Using a 65mm (2.5in) or 90mm (3.54in) 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 cuff in the hole. This
protects the edges of the hole and will help
seal it when you finish the installation pro-
cess.
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.
Wall
IndoorOutdoor
=12mm/0.5 inch Fig. 6.4
NOTE: When drilling the hole in the wall,
make sure to avoid wires, plumbing, and oth-
er sensitive components.
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 direct-
ly into a sewer, make sure that the drain has a
U or S pipe to prevent unwanted odors from
entering the house.

◄ Page 19 ►
7
Refrigerant Piping Connection
Safety Precautions Notes On Pipe Length and Elevation
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 sub-
stances do not enter the refrigerant circuit.
Contamination in the system may cause poor
operating capacity, high pressure in the refrig-
eration cycle, explosion or injury.
• Ventilate the area immediately if there is
refrigerant leakage during the installation.
Leaked refrigerant gas is both toxic and am-
mable. Ensure there is no refrigerant leakage
after completing the installation work.
Ensure that the length of the refrigerant pipe,
the number of bends, and the drop height be-
tween 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

◄ Page 20 ►
Page 20 
Fig. 7.2
Oil traps
CAUTION
•
An oil trap should be installed every 6m (20ft)
or 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.
6m/20ft
(<36000Btu/h unit)
10m/32.8ft
(=>36000Btu/h unit)
6m/20ft
(<36000Btu/h unit)
10m/32.8ft
(=>36000Btu/h unit)