Comfort-aire B-VMH24DU-1 Indoor Ducted Unit Instruction Manual

B-VMH24DU-1 Indoor Ducted Unit

Product Information

The product is a ducted unit air conditioning system. It is
available in four models: B-VMH09DU-1, B-VMH12DU-1, B-VMH18DU-1,
and B-VMH24DU-1. The installation manual provides detailed
instructions and guidelines for installing the system.

Accessories

• Soundproof / insulation sheath – 2 pieces

• Tubing & Fittings

• Seal sponge (some models) – 1 piece

• Orifice (some models) – 1 piece

• Drainpipe Fittings

• Drain joint (some models) – 1 piece

• Seal ring (some models) – 1 piece (for cooling &
  heating)

• EMC Magnetic Ring – 1 piece (wrap the electric wires S1 &
  S2 (P & Q & E) around the magnetic ring twice)

• S1 & S2 (P & Q & E) Magnetic Ring – 1 piece (hitch
  on the connective cable between the indoor unit and outdoor unit
  after installation)

• Owner’s manual

• Installation manual

• Transfer connector(12.7-15.9) / (0.5in-0.63in) – Packed with
  the indoor unit (Note: Pipe size may differ from appliance to
  appliance. To meet different pipe size requirements, sometimes the
  pipe connections need a transfer connector installed on the outdoor
  unit.)

• Transfer connector(6.35-9.52) / (0.25in-0.375in) – Packed with
  the indoor unit (Note: Pipe size may differ from appliance to
  appliance. To meet different pipe size requirements, sometimes the
  pipe connections need a transfer connector installed on the outdoor
  unit.)

• Transfer connector(9.52-12.7) / (0.375in-0.5in) – Packed with
  the indoor unit, used for multi-type models only (Note: Pipe size
  may differ from appliance to appliance. To meet different pipe size
  requirements, sometimes the pipe connections need a transfer
  connector installed on the outdoor unit.)

Product Usage Instructions

Follow the steps below to install the ducted unit air
conditioning system:

Safety Precautions

1. Read and understand all safety precautions mentioned in the
   installation manual before starting the installation process.

Installation Overview

1. Refer to the installation manual for a detailed overview of the
   installation process.

Indoor Unit Installation

1. Refer to the indoor unit parts section in the installation
   manual to identify the components.

2. Follow the indoor unit installation instructions provided in
   the manual.

Outdoor Unit Installation

1. Refer to the outdoor unit installation instructions mentioned
   in the manual.

2. Take note of the outdoor unit types and specifications.

3. Read the notes on drilling a hole in the wall for
   installation.

Drainpipe Installation

1. Follow the drainpipe installation instructions provided in the
   manual.

Refrigerant Piping Connection

1. Read the notes on pipe length and elevation mentioned in the
   manual.

2. Follow the refrigerant piping connection instructions provided
   in the manual.

Wiring

1. Refer to the outdoor unit wiring section in the manual for
   wiring instructions.

2. Follow the indoor unit wiring instructions provided in the
   manual.

3. Ensure the power specifications mentioned in the manual are
   met.

Air Evacuation

1. Follow the evacuation instructions mentioned in the
   manual.

2. Take note of the information regarding adding refrigerant.

Test Run

1. Perform a test run of the installed air conditioning system
   following the instructions provided in the manual.

INSTALLATION MANUAL
Ducted Unit
Models B-VMH09DU-1 B-VMH12DU-1 B-VMH18DU-1 B-VMH24DU-1
517.787.2100 · www.marsdelivers.com

THIS PAGE INTENTIONALLY LEFT BLANK.

Installation Manual – B-VMH09,12,18,24DU-1

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Installation Manual – B-VMH09,12,18,24DU-1
Table of Contents
Installation Manual

1 Accessories …………………………………………….

05

2 Safety Precautions ………………………………. 06

3 Installation Overview …………………………. 07

4 Indoor Unit Installation ……………………… 08

a. Indoor Unit Parts ………………………………….

08

b.Indoor Unit Installation Instructions ……. 08

5 Outdoor Unit Installation ……………………. 13
a. Outdoor Unit Installation Instructions …… 13 b. Outdoor Unit Types and Specifications …. 14 c. Notes on Drilling Hole in Wall ……………….. 15
6 Drainpipe Installation …………………………. 16
3

Installation Manual – B-VMH09,12,18,24DU-1

7 Refrigerant Piping Connection………………….. 18
A. Notes on Pipe Length and Elevation ………….. 18 B. Refrigerant Piping Connection Instructions …20

LN

8 Wiring………………………………………….

23

a. Outdoor Unit Wiring ……………… 23 b. Indoor Unit Wiring ………………… 24 c. Power Specifications ………………. 26

9 Air Evacuation…………………………………………..

28

MC

MC

a. Evacuation Instructions ………………………….. 28 b. Note on Adding Refrigerant ………………….. 29

10 Test Run………………………………………

30

4

Installation Manual – B-VMH09,12,18,24DU-1

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 fire, or equipment failure.

NAME

SHAPE

QUANTITY

Soundproof / insulation sheath

2

Tubing & Fittings

Seal sponge (some models)

1

Orifice (some models)

1

Drainpipe Fittings

Drain joint (some models)

1

(for cooling & heating) Seal ring (some models)

1

EM C M agnetic Ring

Magnetic ring

1

(some models)

(wrap the electric wires S1 & S2 ( P & Q & E )

around the magnetic ring twice)

S1&S2(P&Q&E)

Magnetic ring

1

(Hitch on the connective cable between the indoor

unit and outdoor unit after installation.)

Others

Owner`s manual
Installation manual
Transfer connector(12.7-15.9)/ ( 0.5in-0.63in)(Packed with the indoor unit ) NOTE: Pipe size may differ from appliance to appliance. To meet different pipe size requirements, sometimes the pipe connections need a transfer connector installed on the outdoor unit .
Transfer connector(6.35-9.52)/ ( 0.25in-0.375in )(Packed with the indoor unit) NOTE: Pipe size may differ from appliance to appliance. To meet different pipe size requirements, sometimes the pipe connections need a transfer connector installed on the outdoor unit .
Transfer connector(9.52-12.7)/ ( 0.375in-0.5in ) (Packed with the indoor unit, used for multi-type models only ) NOTE: Pipe size may differ from appliance to appliance. To meet different pipe size requirements, sometimes the pipe connections need a transfer connector installed on the outdoor unit .
Connecting wire for display (2m)

1 1
1 (on some models)
1 (on some models)
1 (on some models) 1(on some models)

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.
5

Safety Precautions

Installation Manual – B-VMH09,12,18,24DU-1
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.

WARNING

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.

CAUTION

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 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 affect 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.

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Installation Manual – B-VMH09,12,18,24DU-1

Installation Overview

INSTALLATION ORDER

1

2

3
3

Install the indoor unit (Page 8)

6

MC

MC

Install the outdoor unit (Page 13)

Install the drainpipe (Page 16)

5

4

LN

Evacuate the refrigeration system (Page 28)

Connect the w ires (Page 23)

Connect the refrigerant pipes (Page 18)

7

Perform a test run (Page 30)
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Installation Manual – B-VMH09,12,18,24DU-1

Indoor Unit Installation

4

Indoor Unit Parts

Air inlet

Electric control cabinet Air filter(on selected models)

Air outlet Safety Precautions

Fig. 4.1

Drain hose Refrigerant connecting pipe

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. It is embeded installation. Models with a cooling capacity of 9000Btu to
18000Btu only apply to one room.

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 fluctuations Enclosed spaces
Areas with strong electromagnetic waves Areas that store flammable materials or gas Rooms with high humidity, such as bathrooms or laundry rooms

8

8.2in(250cm) (When no ceiling)

Installation Manual – B-VMH09,12,18,24DU-1

Installation place

Strong and durable ceiling

Indoor unit Left side

Right side

4in(10cm)
M aintenance space

11.8in(30cm)

0.8in(2cm) B >0.8in(2cm)

11.8in(30cm)

Service access

Ceiling

Floor

7.9in (20cm)

Air outlet

11.8in(30cm)

Air inlet

23.6inx23.6in (60cmx60cm) checking orifice

Fig. 4.2
Step 2: Hang 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 paces where you will drill ceiling hook holes.
Air outlet dimensions

9

Air inlet dimensions

Installation Manual – B-VMH09,12,18,24DU-1

Air filter Descending ventilation opening and mounted hook

Air filter

Electric control box

Fig. 4.3

Table.4-1

M ODEL (Btu/h)
9K/12K 18K 24K

A 700/27.6 880/34.6 1100/43.3

Outline dimension

B 200/7.9 210/8.3 249/9.8

C 506/19.9 674/26.5 774/30.5

(unit: mm/inch)

air outlet opening size air return opening size Size of mounted lug

D 450/17.7 600/23.6 700/27.6

E 152/6 136/5.4 175/6.9

F 537/21.1 706/27.8 926/36.5

G 186/7.3 190/7.5 228/8.9

H 599/23.6 782/30.8 1001/39.4

I 741/29.2 920/36.2 1140/44.9

J 360/14.2 508/20 598/23.5

W ood
Place the wood mounting across the roof beam, then install the hanging screw bolts.(See Fig.4.4)

New concrete bricks Inlay or embed the screw bolts. (See Fig. 4.5)

Wood mounting

Roof beam Ceiling

Hanging screw bolts
Original concrete bricks

Fig. 4.4

Use an embedding screw bolt, crock, and stick harness.(See Fig.4.6)

Steel bar Embedding screw bolt (Pipe hanging and embedding screw bolt)
Fig. 4.6

(Blade shape insertion)

(Slide insertion)

Fig. 4.5

Steel Roof beam structure
Install and use the supporting steel angle. (See Fig.4.7)

Hanging screw bolt

Hanging bolts

Supporting steel angle
Fig. 4.7

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Installation Manual – B-VMH09,12,18,24DU-1

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 fit pipes and wires after you have finished 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.
Cut off the roof beam.
Strengthen the point at which the cut was made. Consolidate the roof beam. 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 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 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).

Shockproof cushion

Screw nut

Washer

Overhang part

Hanging screw bolt

Fig. 4.9

NOTE: Confirm the minimum drain tilt is 1/100 or more.
Step 3: Duct and accessories installation

1. Install the filter (optional) according to the size

of the air inlet. 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 enough to a avoid air passage short-circuit.

4. Connect the duct according to the following

diagram:

Canvas tie-in Canvas tie-in

Isolation booth

Air outlet Isolation booth checking orifice

Air inlet Air dust filter

Fig. 4.10 5. Refer to the following static pressure guidelines
when installing the indoor unit.
Table.4-2

MODEL (Btu/h)

Static Pressure (Pa/in.wg)

9K

0~50/0~0.2

12K

0~50/0~0.2

18K

0~100/0~0.4

24K

0~160/0~0.64

Fig. 4.8
9. Mount the indoor unit onto the hanging screw bolts with a block. Position the indoor unit flat using a level indicator to prevent leaks. (See Fig. 4.9).

Change the fan motor static pressure according to external duct static pressure.
NOTE: 1. Do not place the connecting duct weight on the indoor unit. 2. When connecting the duct, use
nonflammable canvas tie-in to prevent vibrating. 3. Insulation must be wrapped outside the duct to avoid condensate. An internal duct underlayer can be added to reduce noise, if the end-user requires.
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Installation Manual – B-VMH09,12,18,24DU-1

Step 4: Adjust the air inlet direction (from rear side to under-side). 1. Take off the ventilation panel and flange.
Air return flange

Step 5: Fresh air duct installation Dimension :
Duct joint for fresh air

Ventilation panel

Fig. 4.11

2. Change the mounting positions of the ventilation panel and air return flange. Ventilation panel

Air return flange

Fig. 4.12

3. When installing the filter mesh, fit it into the flange as illustrated in the following figure.

Ø125mm(4.92″)

MODLE 18-60
Ø160mm(6.3″)

Fig. 4.14 Step 6: M otor and drain pump maintenance
(the rear ventilated panel is used as an example)
Motor maintain:
1. Take off the ventilated panel. 2. Take off the blower housing. 3. Take off the motor.

Fig. 4.13
NOTE: All the figures in this manual are for demonstration purposes only. The air conditioner you have purchased may be slightly different in design, though similar in shape.

Motor
Blower housing Ventilated panel
Fig. 4.15
Pump maintainance: 1. Remove four screws from the drain pump. 2. Unplug the pump power supply and water
level switch cable. 3. Detach the pump.

Pump

Fig. 4.16

12

Installation Manual – B-VMH09,12,18,24DU-1

Outdoor Unit Installation

5

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 (3.2 ft.) 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 Step 2: Install outdoor unit.
Fix the outdoor unit with anchor bolts (M10)

Fig. 5.2

Strong wind

60cm / 23.6″ Fix with bolts
Fig. 5.3

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.
13

Split Type Outdoor Unit (Refer to Fig 5.4, 5.5, 5.6, 5.10 and Table 5.1)

Fig. 5.4

H
W W

H
Fig. 5.5

Installation Manual – B-VMH09,12,18,24DU-1

Table 5.1: Length Specifications of Split Type Outdoor Unit (unit: mm/ inch)

Outdoor Unit Dimensions M ounting Dimensions

W xHxD

Distance A Distance B

770x555x300 (30.3×21.85×11.81)

487 (19.2) 298 (11.73)

810x558x310 (31.9x22x12.2)

549 (21.6) 325 (12.8)

845x700x320 (33.27×27.5×12.6)

560 (22)

335 (13.2)

900x860x315 (35.4×33.85×12.4)

590 (23.2) 333 (13.1)

945x810x395 (37.2×31.9×15.55)

640 (25.2) 405 (15.95)

990x965x345 (38.98x38x13.58)

624 (24.58) 366 (14.4)

938x1369x392 (36.93×53.9×15.43) 900x1170x350 (35.4x46x13.8)

634 (24.96) 404 (15.9) 590 (23.2) 378 (14.88)

800x554x333 (31.5×21.8×13.1) 845x702x363 (33.27×27.6×14.3) 946x810x420 (37.24×31.9×16.53)

514 (20.24) 540 (21.26) 673 (26.5)

340 (13.39) 350 (13.8) 403 (15.87)

946x810x410 (37.24×31.9×16.14) 952x1333x410 (37.5×52.5×16.14)

673 (26.5) 634 (24.96)

403 (15.87) 404 (15.9)

952x1333x415 (37.5×52.5×16.34)

634 (24.96) 404 (15.9)

A

D

B

Fig. 5.6

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Installation Manual – B-VMH09,12,18,24DU-1

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 (B,C,D) (See Fig. 5.10)

60 cm / 23.6″ above

(D)
M 30 cm / 11.8″ on left

(E)

30

cm

/

11.8″

(A) from

back

wall

(B)

(C)

Fig60. c5m ./1230.6″ P

on

right

N 200

cm

/

78″

in

froAnt B

4″ Clearance (Min. allowed) 1%-2% efficiency and capacity Loss 5″ Clearance with no efficiency or capacity loss
12″ on right

C 79″ in front

D 12″ on left E 24″ above

Fig. 5.10

Row s of series installation

Table 5.3 The relations betw een H, A and L are as follow s.

L H L > H

L L 1/2H

A 25 cm / 9.8″ or more

1/2H < L H 30 cm / 11.8″ or more

Can not be installed

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.
NOTE: Make sure the water drains to a safe location where it will not cause water damage or a slipping hazard.
Base pan hole of outdoor unit Seal Seal

Drain joint

(A)

(B)

Fig. 5.12

o2r5mcomre/ 9.8″

o2r5mcmore/ 9.8″

H

L A

300 cm / 118″ or more

150 ocrmm/o5r9e”

60

cm or

m/ 2o3r.e6″

Fig. 5.11

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.

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 cuff in the hole. This protects the edges of the hole and will help seal it when you finish the installation process.

15

Installation Manual – B-VMH09,12,18,24DU-1

Drainpipe Installation

6

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 the drainpipe forcefully. This could disconnect it.
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. 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. (See Fig 6.1)
Drain hose

Drainpipe connecting port

Pipe clasp
Fig. 6.1
Ceiling

Insulation

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.
· To prevent air bubbles, keep the drain hose level or slightly tilted up (<75mm / 3″).

Drainpipe installation for units w ith a pump

Ceiling

<20cm (7.9″)

1-1.5m (39-59″) Lean over 1/50

<55cm (21.7″)

0 – 75mm (3″)
Fig. 6.3 NOTE: When connecting multiple drainpipes, install the pipes as illustrated in Fig 6.4.
0-53cm (20.8″)

Fig. 6.2

1-1.5m (39-59″)
Lean over 1/50

10cm (4″)

16

Fig. 6.4

Installation Manual – B-VMH09,12,18,24DU-1

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. 6.5). Place the protective wall cuff in the hole. This protects the edges of the hole and will help seal it once you finish installation.
Wall

Units w ith a pump.
1. Remove the test cover. Fill the water pan with 2 liters of water.

Outdoor

Indoor

12mm / 0.5 inch
Fig. 6.5
NOTE: When drilling the hole, make 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.
Drainage test Check that the drainpipe is unhindered. This test should be performed on newly built houses before the ceiling is covered.
Units w ithout a pump.

CLOSED
Test cap

OPEN

CLOSED

OPEN
Fig.6.7

Stow tube
Fig.6.8
2. Turn on the unit in COOLING mode. You will hear the drain pump.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.

Stow tube

Fig.6.6

Fill the water pan with 2 liters of water. Check that the drainpipe is unhindered.

3. Turn off the air conditioner and put the cap back on.
17

Refrigerant Piping Connection

Installation Manual – B-VMH09,12,18,24DU-1
7

Safety Precautions
WARNING
· All field 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 your outdoor IOM.

18

Installation Manual – B-VMH09,12,18,24DU-1
CAUTION
· Oil traps If the indoor unit is installed higher than the outdoor unit: -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. An oil trap should be installed every 10m (32.8ft) of vertical suction line riser. (See Fig. 7.2)

CAUTION
If 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 below7.62m/s (1500fpm (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)

Fig. 7.2
The indoor unit is installed higher than the outdoor unit

Fig. 7.3
The outdoor unit is installed higher than the indoor unit

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Installation Manual – B-VMH09,12,18,24DU-1

Piping length
Drop height

Table 7.2

Permitted length

Total piping length

18K+18K 30m/98′

24K+24K 50m/164′ 30K+30K

(farthest distance from the line pipe branch)

15m/49′

(farthest distance from the line pipe branch)
Drop height between indoor and outdoor unit
Drop height between two indoor units

10m/32.8′ 20m/65.6′ 0.5m/1.6′

L+Max (L1, L2)
L1, L2 L1-L2
H1 H2

Size of joint pipes for indoor unit Table 7.3 Size of joint pipes for 410A indoor unit

Capacity of indoor unit (A)
18K 24K 30K

Size of main pipe(mm) Gas side Liquid side
12.7(0.5″) 6.35(0.25″) 15.9(0.626″) 9.5(0.375″) 15.9(0.626″) 9.5(0.375″)

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. 7.4 for examples of bad cuts

Size of joint pipes for outdoor unit
Base on the following tables, select the diameters of the outdoor unit connective pipes. In case of the main accessory pipe larger than the main pipe, take the larger one for the selection.

90°

Oblique

Rough

Warped

Table 7.4 Size of joint pipes for 410A outdoor unit

Model the size of main pipe(mm) Gas side Liquid side

36K 15.9(0.626″)

9.5(0.375″)

Fig. 7.4
Step2: Remove burrs.
Burrs can affect the air-tight seal of refrigerant piping connection. They must be completely removed.

Refrigerant Piping Connection Instructions
CAUTION

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.

· DO NOTinstall the connecting pipe until both indoor and outdoor units have been installed.
· Insulate both the gas and liquid piping to prevent water leakage.

Point dow n

Pipe Reamer

Fig. 7.5 20

Installation Manual – B-VMH09,12,18,24DU-1

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. 7.6
Flare nut
Copper pipe
Fig. 7.6 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

Table 7.5: PIPING EXTENSION BEYOND FLARE FORM

Pipe gauge

Tight ening t orque

Flare dimension (A) (Unit: mm/ Inch)

M in.

M ax.

Flare shape

1/4″

18-20 N.m

8.4/0.33 8.7/0.34

(183-204 kgf.cm)

3/8″

25-26 N.m

13.2/0.52 13.5/0.53

(255-265 kgf.cm)

90 °± 4 45 °±2
A

1/2″

35-36 N.m

16.2/0.64 16.5/0.65

(357-367 kgf.cm)

R0.4~0.8

5/8″

45-47 N.m

19.2/0.76 19.7/0.78

(459-480 kgf.cm)

Fig. 7.8

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.

Pipe
Fig. 7.7
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 7.5.

Indoor unit tubing

Flare nut

Pipe

Fig. 7.9

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.

21

Installation Manual – B-VMH09,12,18,24DU-1

NOTE:Use both a spanner and a torque wrench when connecting or disconnecting pipes to/from
the unit.

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.

Fig. 7.10
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.

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).

NOTE ON M INIM UM 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. 7.11 6. After connecting the copper pipes to the
indoor unit, wrap the power cable, signal cable and the piping together with binding tape.
22

Installation Manual – B-VMH09,12,18,24DU-1

W iring

8

Safety Precautions
WARNING
· Disconnect the power supply before working on the unit.
· All wiring must be performed according to local and national regulations.
· Wiring must be done by a qualified technician. Improper connections may cause electrical malfunction, injury, or fire.
· An independent circuit must be used for this unit. DO NOT plug another appliance or charger into the same circuit. If the circuit cannot handle the load or there is a defect in the wiring, it can lead to shock, fire, and 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 power supply connection is made through a switch that disconnects all poles, with contact gap of at least 3mm (0.118″).
· DO NOT modify the length of the power
cord or use an extension cord.

To prevent distortion when the compressor starts (you can find the unit’s power information on the rating sticker):
· The unit must be connected to the main outlet. Normally, the power supply must have a impedance of 32 ohms.
· No other equipment should be connected to the same power circuit.
TAKE NOTE OF FUSE SPECIFICATIONS The air conditioner’s printed circuit board (PCB) is designed with a fuse that provides overcurrent protection. The specifications of the fuse are printed on the circuit board, examples of such are T5A/250VAC and T10A/250VAC.
Outdoor Unit Wiring
WARNING
Before performing any electrical or wiring work, turn off the main power to the system. 1. Prepare the cable for connection
a. You must first choose the right cable size. Be sure to use H07RN-F cables.
Table 8.1: M inimum Cross-Sectional Area of Pow er Cables in North America

CAUTION
· Connect the outdoor wires before connecting the indoor wires.
· Make sure you ground the unit. The grounding wire should be located away from gas pipes, water pipes, lightning rods, telephone wires or other grounding wires. Improper grounding may cause electrical shock.
· DO NOT connect the unit to the power source until all wiring and piping is completed.
· Make sure that you do not cross your electrical wiring with your signal wiring. This may cause distortion and interference.
23

Rated Current of Appliance (A)
7 7 – 13 13 – 18 18 – 25 25 – 30

AW G
18 16 14 12 10

Installation Manual – B-VMH09,12,18,24DU-1

Table 8.2: Other World Regions

Rated Current of Nominal Cross-Sectional

Appliance (A)

Area (mm²)

6

0.75

6 – 10

1

10 – 16

1.5

16 – 25

2.5

25- 32

4

32 – 45

6

b. Using wire strippers, strip the rubber jacket from both ends of the signal cable to reveal approximately 15cm (5.9″) of wire.
c. Strip the insulation from the ends.
d. Using a wire crimper, crimp u-lugs on the ends.
NOTE: When 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, take off the bolts from the maintenance board and remove the protection board. (See Fig. 8.1, 8.2)

Indoor Unit Wiring 1. Prepare the cable for connection
a. Using wire strippers, strip the rubber jacket from both ends of the signal cable to reveal about 15cm (5.9″) of the wire.
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. Remove the cover of the electric control box on your indoor unit.
3. Connect the u-lugs to the terminals. Match the wire colors/labels with the labels on the terminal block, 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.
Control box

Cover Screw

Fig. 8.1

3. Connect the u-lugs to the terminals Match the wire colors/labels with the labels on the terminal block, Firmly screw the u-lug of each wire to its corresponding terminal.
4. Clamp down the cable with the 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.

Wiring diagram

Connective wiring diagram
Fig. 8.3

Magnetic ring(if supplied and packed with the accessories)
1 2 3

Fig. 8.4

Pass the belt through the hole of the Magnetic ring to fix it on the cable

24

Installation Manual – B-VMH09,12,18,24DU-1
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.
4. Clamp down the cable with the cable clamp. The cable must not be loose or pull on the u-lugs.
5. Reattach the electric box cover.
Using the w ire controller to set external static pressure (some models)
· You can use the unit’s automatic airflow adjustment function to set external static pressure.
· Automatic airflow adjustment is the volume of blow-off air that has been automatically adjusted to the quantity rated. 1. Make sure the test run is done with a dry coil. If the coil is not dry, run the unit for 2 hours in FAN ONLY mode to dry the coil.
2. Check that both power supply wiring and duct installation have been completed Check that any closing dampers are open. Check that the air filter is properly attached to the air suction side passage of the unit.
3. If there is more than one air inlet and outlet, adjust the dampers so that the airflow rate of each air inlet and outlet conforms with the designed airflow rate. Make sure the unit is in FAN ONLY mode. Press and set the airflow adjustment button on the remote control to change the airflow rate from H or L.
4. Set the parameters for automatic airflow adjustment. When the air conditioning unit is off, perform the following steps:
– Press”COPY”. – Press “+” or “-” to select the AF.

– Press “CONFIRM”. The air conditioning unit will then start the fan for airflow automatic adjustment.
ON will flash during when the fan is on during automatic airflow adjustment.
CAUTION
· DO NOT adjust the dampers when automatic airflow adjustment is active.
After 3 to 6 minutes, the air conditioning unit stops operating once automatic airflow adjustment has finished.
CAUTION
· If there is no change after airflow adjustment in the ventilation paths, be sure to reset automatic airflow adjustment.
· If there is no change to ventilation paths after airflow adjustment,contact your dealer, especially if this occurs after testing the outdoor unit or if the unit has been moved to a different location.
· Do not use automatic airflow adjustment with remote control,if you are using booster fans, outdoor air processing unit, or a HRV via duct.
· If the ventilation paths have been changed, reset airflow automatic adjustment as described from step 3 onwards.

25

Installation Manual – B-VMH09,12,18,24DU-1
Pow er Specifications NOTE: Electric auxiliary heating type circuit breaker/fuse need to add more than 10 A.

Indoor Pow er Supply Specifications

M ODEL(Btu/h)

18K 19K~24K 25K~36K

POWER

PHASE VOLT

1 Phase 1 Phase 1 Phase 208-240V 208-240V 208-240V

CIRCUIT BREAKER/ FUSE(A)

25/20

32/25

50/40

Outdoor Pow er Supply Specifications

M ODEL(Btu/h)

POWER

PHASE VOLT

18K 19K~24K 25K~36K 1 Phase 1 Phase 1 Phase 208-240V 208-240V 208-240V

CIRCUIT BREAKER/ FUSE(A)

25/20

32/25

50/40

Independent Pow er Supply Specifications

M ODEL(Btu/h) POWER PHASE (indoor) VOLT

18K 19K~24K 25K~36K 1 Phase 1 Phase 1 Phase 208-240V 208-240V 208-240V

CIRCUIT BREAKER/ FUSE(A)
POWER PHASE (outdoor) VOLT

15/10 15/10 15/10 1 Phase 1 Phase 1 Phase 208-240V 208-240V 208-240V

CIRCUIT BREAKER/ FUSE(A)

25/20 32/25 50/40

26

Installation Manual – B-VMH09,12,18,24DU-1

Inverter Type A/ C Pow er Specifications

M ODEL(Btu/h)

POWER (indoor)

PHASE VOLT

18K 19K~24K 25K~36K 1 Phase 1 Phase 1 Phase 220-240V 220-240V 220-240V

CIRCUIT BREAKER/ FUSE(A)

POWER (outdoor)

PHASE VOLT

15/10 15/10 15/10 1 Phase 1 Phase 1 Phase 208-240V 208-240V 208-240V

CIRCUIT BREAKER/ FUSE(A)

25/20 25/20 40/30

27

Installation Manual – B-VMH09,12,18,24DU-1

Air Evacuation

9

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 to be vacuumed. 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 the gauge reading is still above -0.1MPa, check if there is a gas leak or water inside the pipe. If there is no leak, perform another evacuation for 1 or 2 hours.
· DO NOT use refrigerant gas to purge the system.

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 off 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.

Evacuation Instructions

Flare nut

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

Pressure gauge

-76cmHg
Low pressure valve Charge hose

High pressure valve Charge hose
Vacuum pump

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.

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 STEM S GENTLY When opening the 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.

28

Installation Manual – B-VMH09,12,18,24DU-1
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. · 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

6.35(1/4″)

9.52(3/8″)

12.7(1/2″)

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)

(Total pipe length standard pipe length) x65g(0.69oZ)/m(ft)

29

Test Run

Installation Manual – B-VMH09,12,18,24DU-1

THIS PAGE IS INTENTIONALLY LEFT BLANK

10

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 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 work 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 off 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.

30

Installation Manual – B-VMH09,12,18,24DU-1
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31

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References

• kgf.cm

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