HEAT CONTROLLER, INC.
Wall Mounted Multi-Zone Split System
MMC18DA-1 MMH18DA-1
MMC24DA-1 MMH24DA-1
MMC36TA-1 MMH36TA-1
Air Conditioning / Heat Pump
2 Wall Mounted Multi-Zone Split System Air Conditioner
Wall Mounted Multi-Zone Split System Air Conditioner Installation Manual
TABLE OF CONTENTS
Installation Parts Provided.........................................3
Safety Precautions......................................................4
Installation of Indoor, Outdoor Unit...........................7
Select the best location ...........................................7
Seaside Applications and Installation.......................8
Piping length and elevation ......................................9
Mounting Installation Plate .....................................10
Drilling the hole in the wall .....................................10
Flaring Work and Connection of Piping..................11
Flaring work............................................................11
Connecting the Piping ............................................12
Connecting the Cable between Indoor Unit
and Outdoor Unit.......................................................18
Connect the cable to the Indoor unit. .....................18
Connect the cable to the Outdoor unit. ..................19
Methods of connecting the cable ...........................20
Connect the cable to the indoor unit ......................21
Checking the Drainage, Insulating the pipe and
Special piping applications......................................22
Checking the drainage............................................22
Insulating the pipe and Special piping applications.
................................................................................23
Air Purging and Evacuation.....................................24
Leak Checking........................................................24
Evacuation..............................................................25
Charging.....................................................................26
Test Running..............................................................27
❏ Level gauge
❏ Screw driver
❏ Electric drill
❏ Hole core drill (ø 70 mm/ø 1.97 inch)
❏ Flaring tool set
❏ Specified torque wrenches
1.8 kg.m, 4.2 kg.m, 5.5 kg.m, 6.6 kg.m
(13 lbf.ft, 30 lbf.ft, 47.7 lbf.ft)
(different depending on model No.)
❏ Adjustable wrench
❏ A glass of water
❏ Hexagonal wrench(4 mm/0.16 inch)
❏ Refrigerant Gas Leak Detector
❏ Vacuum pump
❏ Gauge manifold
❏ Owner's manual
❏ Thermometer
❏ Remote Control Holder
Installation Requirements
Required Tools
Installation Manual 3
Installation Parts Provided
Installation Parts Provided
Type "A" screws and plastic anchors
Type "B" screws
Remote Control Holder
Installation plate
Standard Type
more than
70 cm
(27.6 inch)
more than
30 cm
(11.8 inch)
more than
30 cm
(11.8 inch)
Air Outlet
Air Intake
(side, rear)
Connection pipe
Drain hose
Connecting wire
Control cover
more than 30 cm
(11.8 inch)
more than
70 cm
(27.6 inch)
more than
60 cm
(23.6 inch)
more than
60 cm
(23.6 inch)
18/24K BTU/h
36K BTU/h
more than
30 cm
(11.8 inch)
more than
30 cm
(11.8 inch)
Air Outlet
Air Intake
(side, rear)
Connection pipe
Drain hose
Connecting wire
Control cover
more than 30 cm
(11.8 inch)
4 Wall Mounted Multi-Zone Split System Air Conditioner
Do not use a defective or
underrated circuit breaker.
Use this appliance on a
dedicated circuit.
• There is risk of fire or electric
shock.
For electrical work, contact
the dealer, seller, a qualified
electrician, or an Authorized
Service Center.
• Do not disassemble or repair
the product. There is risk of
fire or electric shock.
Always electrically ground
the product.
• There is risk of fire or electric
shock.
Install the panel and the
cover of control box securely.
• There is risk of fire or electric
shock.
Always install a dedicated
circuit and breaker.
• Improper wiring or installation
may cause fire or electric
shock.
Use the correctly rated
breaker or fuse.
• There is risk of fire or electric
shock.
Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions
must be followed.
■ Incorrect operation due to ignoring instructions will cause harm or damage. The seriousness
is classified by the following indications.
■ Meanings of symbols used in this manual are as shown below.
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage.
WARNING
Be sure not to do.
Be sure to follow the instruction.
Safety Precautions
■ Installation
WARNING
CAUTION
Installation Manual 5
Safety Precautions
Do not modify or extend the
power cable.
• There is risk of fire or electric
shock.
Be cautious when
unpacking and installing
the product.
•
Sharp edges could cause
injury. Be especially careful of
the case edges and the fins on
the condenser and evaporator.
For installation, always
contact the dealer or an
Authorized Service Center.
• There is risk of fire, electric
shock, explosion, or injury.
Do not install the product
on a defective installation
stand.
• It may cause injury, accident,
or damage to the product.
Do not let the air conditioner
run for a long time when the
humidity is very high and a
door or a window is left open.
• Moisture may condense and
dampen or damage furniture.
Be sure the installation area
does not deteriorate with age.
•
If the base collapses, the air
conditioner could fall with it,
causing property damage, product
failure, and personal injury.
Install the indoor unit on the wall where the
height from the floor is more than 8 ft. (2.4m).
•
There are sharp moving parts that could cause
personal injury.
Do not handle the pipe by yourself(customer)
• High-Pressure refrigent may cause personal
injury.
8ft(2.4m)
6 Wall Mounted Multi-Zone Split System Air Conditioner
Safety Precautions
CAUTION
■ Installation
Always check for gas
(refrigerant) leakage after
installation or repair of
product.
• Low refrigerant levels may
cause failure of product.
Install the drain hose to
ensure that water is drained
away properly.
• A bad connection may cause
water leakage.
Keep level even when
installing the product.
• To avoid vibration or water
leakage.
Do not install the product
where the sound or hot air
from the outdoor unit could
be offensive to neighbors.
• It may cause a problem for
your neighbors.
Use two or more people to
lift and transport the
product.
• Avoid personal injury.
Do not install the product
where it will be exposed to
salt spray directly.
• It may cause corrosion on the
product. Corrosion,
particularly on the condenser
and evaporator fins, could
cause product malfunction or
inefficient operation.
Do not store or use flammable gas or
combustibles near the product.
• There is risk of fire or failure of product.
■ Operation
Gasolin
90°
Installation Manual 7
Installation of Indoor, Outdoor Unit
Installation of Indoor, Outdoor Unit
Read completely, then follow step by step.
Indoor unit
1. Does not have any heat or steam near the
unit.
2. Select a place where there are no obstacles
in front of the unit.
3. Make sure that condensation drainage can be
conveniently routed away.
4. Do not install near a doorway.
5. Ensure the unit is unobstructed, allow proper
space on all sides according to the arrows
and distance measurements in the figures.
6. Use a stud finder to locate studs to prevent
unnecessary damage to the wall.
Outdoor unit
1. If an awning is built over the unit to prevent
direct sunlight or rain exposure, make sure
that heat radiation from the condenser is not
restricted.
2. Ensure the unit is unobstructed, allow proper
space on all sides according to the arrows
and distance measurements in the figures.
3. Do not place animals and plants in the path
of the warm air.
4. Take the air conditioner weight into account
and select a place where noise and vibration
are minimum.
5.
Select a place so that the warm air and sound
from the air conditioner does not disturb
neighbors.
Rooftop Installations:
If the outdoor unit is installed on a roof
structure, be sure to level the unit. Ensure the
roof structure and anchoring method are
adequate for the unit location. Consult local
codes regarding rooftop mounting.
Select the best location
More than 20 cm
(7.9 inch)
More than 10 cm
(3.9 inch)
More than 10 cm
(3.9 inch)
More than 2.4m
(8 ft)
CAUTION: Install the indoor unit
on the wall where the height from
the floor is more than 2.4 m (8 ft).
18/24K BTU/h
Indoor Unit
36K BTU/h
more than 30 cm
(11.8 inch)
more than 70 cm
(27.6 inch)
more than 30 cm
(11.8 inch)
more than 70 cm
(27.6 inch)
more than 30 cm
(11.8 inch)
more than 60 cm
(23.6 inch)
more than 30 cm
(11.8 inch)
more than 60 cm
(23.6 inch)
Seaside Applications and Installation
8 Wall Mounted Multi-Zone Split System Air Conditioner
Installation of Indoor, Outdoor Unit
1.
Air conditioners should not be installed in areas where corrosive gases, such as acid or alkaline gas, are
produced.
2. Do not install the product where it could be exposed to sea wind (salty wind) directly. It can result
in corrosion to the product. Particularly on the condenser and evaporator fins, could
cause product malfunction or inefficient performance.
3.
If the outdoor unit is installed close to the seaside, ensure that it is not exposed directly to
the sea wind.
1) If the outdoor unit is to be installed close to the seaside, direct exposure to the sea wind should be avoided.
Install the outdoor unit on the opposite side of the sea wind direction.
2) To install the outdoor unit on the seaside, set up a windbreaker/barrier, to lessen the unit's exposure to sea air
3) Select a well-drained place.
• It should be strong enough (like concrete) to obstruct
the wind from the sea.
• The height and width should be more than 150% of
the outdoor unit.
• A minimum of 70cm (27.6inches)
of space between outdoor unit and the windbreaker/
barrier for easy air flow.
Sea wind Sea wind
Sea wind
Windbreaker/Barrier
Periodic ( more than once/year ) cleaning of the dust or salt particles stuck on the heat exchanger
using water is recommended.
1. Selecting the location(Outdoor Unit)
Installation Manual 9
Installation of Indoor, Outdoor Unit
Multi-Zone Piping Recommendations:
Piping length and elevation
18K BTU/h 30 m (100 ft) 15 m (50 ft) 3 m (10 ft) 7.5 m (25 ft) 7.5 m (25 ft)
24K BTU/h 30 m (100 ft) 15 m (50 ft) 3 m (10 ft) 7.5 m (25 ft) 7.5 m (25 ft)
36K BTU/h 45 m (150 ft) 15 m (50 ft) 3 m (10 ft) 7.5 m (25 ft) 7.5 m (25 ft)
Capacity
Max total length
of all pipes
(A+B/A+B+C)
Max length of
each pipe
(A/B/C)
Min length of
each pipe
(A/B/C)
Max Elevation
between each
indoor unit and
outdoor unit (h1)
Max elevation
between indoor
units (h2)
h2
h2
h1
A
B
B
C
h2
h1
A
B
h1
h1
h1
CAUTION: Capacity is based on standard length and maximum allowance
length based on reliability.
9K BTU/h 9.52 mm (3/8") 6.35 mm (1/4") 7.5 m (25 ft) 20 g/m (0.22 oz/ft)
12K BTU/h 9.52 mm (3/8") 6.35 mm (1/4") 7.5 m (25 ft) 20 g/m (0.22 oz/ft)
Gas (Flare) Liquid (Flare) Standard Length
Additional
Refrigerant
Indoor Capacity
Pipe Size
18/24K BTU/h
36K BTU/h
• Drill the piping hole with a Ø 70 mm (Ø 2.75 inch) hole core drill. Drill the piping hole at either
the right or the left with the hole slightly slanted to the outdoor side.
Drilling the hole in the wall
5-7 mm
(0.2"~0.3")
Indoor
WALL
Outdoor
10 Wall Mounted Multi-Zone Split System Air Conditioner
Installation of Indoor, Outdoor Unit
The wall you select should be strong and solid
enough to prevent vibration
1. Mount the installation plate on the wall with
type "A" screws. If mounting the unit on a
concrete wall, use anchor bolts.
• Mount the installation plate horizontally by
aligning the centerline using a level.
2. Measure the wall and mark the centerline. It
is also important to use caution concerning
the location of the installation plate-routing
of the wiring to power outlets is through the
walls typically.
Mounting Installation Plate
Installation Plate
Type "A" screw
Chassis
Hook
ABCD
9K BTU/h 50 (1.97) 105 (4.13) 59 (2.32) 105 (4.13)
12K BTU/h 65 (2.56) 110 (4.33) 85 (3.35) 110 (4.33)
CHASSIS
(Grade)
Distance mm (inch)
D
C
Ø 70 mm
Ø 2.75 inch
Left rear piping Right rear piping
Installation plate
A
B
Ø 70 mm
Ø 2.75 inch
Installation Manual 11
Flaring Work and Connection of Piping
Flaring Work and Connection of Piping
Flaring work
Main cause for gas leakage is due to defect in flaring work. Carry out the correct flaring work by
using the following procedures.
Cut the pipes
1. Use the piping kit accessory or the pipes
purchased locally.
2. Measure the distance between the indoor and
the outdoor unit.
3. Cut the pipes a little longer than measured
distance.
4. Cut the cable 1.5 m (5.0 ft) longer than the pipe
length.
Burrs removal
1. Completely remove all burrs from the cut cross
section of pipe/tube.
2. Put the end of the copper tube/pipe in a
downward direction as you remove burrs in
order to avoid dropping burrs into the tubing.
Putting flare nuts on
1. Remove flare nuts attached to indoor and
outdoor unit, then put them on pipe/tube having
completed burr removal.
(not possible to put them on after flaring work)
Flaring work
1. Carry out flaring work using flaring tool as
shown below.
2. Firmly hold copper pipe in a bar in the
dimension shown in the table below.
Copper
pipe
90°
Slanted Uneven Rough
mm inch mm inch
Ø6.35 1/4 1.1~1.3 0.4 - 0.5
Ø9.52 3/8 1.5~1.7 0.6 - 0.7
Outside diameter A
Bar
Copper pipe
Clamp handle
Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Pipe
Reamer
Point down
Flare nut
Copper tube
12 Wall Mounted Multi-Zone Split System Air Conditioner
Flaring Work and Connection of Piping
Check
1. Compare the flared work with the figure on
the right.
2. If a flared section is defective, cut it off and
repeat the flaring process again.
Indoor
1. Prepare the indoor unit's piping and drain hose for installation through the wall.
2. Remove the plastic tubing retainer(see the
illustration on the right) and pull the tubing
and drain hose away from chassis.
1. Route the indoor tubing and the drain hose in
the direction of rear right.
2.
Insert the connecting cable into the indoor unit
from the outdoor unit through the piping hole.
• Do not connect the cable to the indoor unit.
• Make a small loop with the cable for easy
connection later.
3. Tape the tubing, drain hose, and the
connecting on cable. Be sure that the drain
hose is located on the lowest side of the
bundle. Locating on the upper side can cause
the condensation to overflow in the drain pan
inside the indoor unit.
If the drain hose is routed inside the room,
insulate the hose with an insulation material*
so that dripping from "sweating"(condensation)
will not damage furniture or floors.
*Foamed polyethylene or equivalent is
recommended.
Inclined
Inside is shiny without scratches
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =
Connecting the Piping
For right rear piping
Drain hose
Tape
Connecting
pipe
Drain hose
Connecting cable
Drain hose
Installation Manual 13
Flaring Work and Connection of Piping
4. Indoor unit installation
Hook the indoor unit onto the upper portion of
the installation plate.(Engage the two hooks
of the rear top of the indoor unit with the
upper edge of the installation plate.) Ensure
that the hooks are properly seated on the
installation plate by moving it left and right.
Press the lower left and right sides of the unit
against the installation plate until the hooks
engage into their slots(clicking sound).
Connecting the piping to the indoor unit and
drain hose to drain pipe.
1. Align the center of the pipes and sufficiently
tighten the flare nut by hand.
2. Tighten the flare nut with a wrench.
3. Next, extend the indoor unit's drain hose.
Then attach the drain pipe.
Wrap the insulation material around all
connections.
1. Overlap the connection pipe insulation
material and the indoor unit pipe insulation
material. Bind them together with vinyl tape
so that there is no gap.
2. Wrap the area which accommodates the rear
piping housing section with vinyl tape.
3. Bundle the piping and drain hose together by
wrapping them with vinyl tape for enough to
cover where they fit into the rear piping
housing section.
Drain hose
Connecting
cable
mm inch kgf.m (lbf-ft)
Ø6.35 1/4 1.8 ~ 2.5 (13)
Ø9.52 3/8 3.4 ~ 4.2 (20)
Outside diameter Torque
Indoor unit tubing Flare nut Pipes
Open-end wrench (fixed)
Flare nut
Wrench
Indoor unit tubing
Drain pipe
Connection pipe
Connection pipe
Vinyl tape (wide)
Connecting cable
Pipe
Drain hose
Indoor unit drain hose
Vinyl tape(narrow)
Adhesive
Plastic bands
Vinyl tape(narrow)
Wrap with vinyl tape
Insulation material
Wrap with vinyl tape
Vinyl tape(wide)
Indoor unit pipe
Pipe
14 Wall Mounted Multi-Zone Split System Air Conditioner
Flaring Work and Connection of Piping
1. Route the indoor tubing and the drain hose to
the required piping hole position.
2. Insert the piping, drain hose, and the
connecting cable into the piping hole.
3.
Insert the connecting cable into the indoor unit.
• Don't connect the cable to the indoor unit.
• Make a small loop with the cable for easy
connection later.
4. Tape the drain hose and the connecting
cables.
5. Indoor unit installation
• Hang the indoor unit from the hooks at the
top of the installation plate.
• Insert the spacer between the indoor unit
and the installation plate and separate the
bottom of the indoor unit from the wall.
Connecting the piping to the indoor unit and
the drain hose to drain pipe.
1. Align the center of the pipes and sufficiently
tighten the flare nut by hand.
2. Tighten the flare nut with a wrench.
3. Next, extend the indoor unit's drain hose.
Then attach the drain pipe.
For left rear piping
mm inch kgf.m (lbf-ft)
Ø6.35 1/4 1.8 ~ 2.5 (13)
Ø9.52 3/8 3.4 ~ 4.2 (20)
Outside diameter Torque
Indoor unit
Installation plate
8 cm
(3.15 inch)
Spacer
Connecting
cable
Drain pipe
Wrench
Indoor unit tubing
Indoor unit tubing Flare nut Pipes
Open-end wrench (fixed)
Flare nut
Connection pipe
Drain hose
Indoor unit drain hose
(narrow)
Vinyl tape
Adhesive
Installation Manual 15
Flaring Work and Connection of Piping
Wrap the insulation material around the
connecting portion.
1. Overlap the connection pipe insulation and
the indoor unit pipe heat insulation material.
Bind them together with vinyl tape so that
there is no gap.
2. Wrap the area which accommodates the rear
piping housing section with vinyl tape.
3. Bundle the piping and drain hose together by
wrapping them with vinyl tape over the range
within which they fit into the rear piping
housing section.
Reroute the piping and the drain hose
across the back of the chassis.
Indoor unit installation
1. Remove the spacer.
2. Ensure that the hooks are properly seated on
the installation plate by moving it left and
right.
3. Press the lower left and right sides of the unit
against the installation plate until the hooks
engage into their slots(clicking sound).
Plastic bands
Insulation material
Connection
pipe
Vinyl tape
(wide)
Connecting cable
Wrap with vinyl tape
Pipe
Vinyl tape(narrow)
Indoor
unit piping
Drain hose
Piping for
passage through
piping hole
Pipe
Vinyl tape(narrow)
Wrap with
vinyl tape(wide)
Connecting
cable
Drain hose
16 Wall Mounted Multi-Zone Split System Air Conditioner
Flaring Work and Connection of Piping
Installation Information. For left piping. Follow the instruction below.
Best Practice
• Press on the upper side of clamp and unfold the tubing to slowly downward.
Worst Practice
• Bending the pipe from right to left may cause damage to the tubing.
Installation Manual 17
Flaring Work and Connection of Piping
Outdoor
Align the center of the piping and sufficiently
tighten the flare nut by hand.
Finally, tighten the flare nut with a torque
wrench until the wrench clicks.
• When tightening the flare nut with the torque
wrench, ensure the direction for tightening
follows the arrow on the wrench.
Outdoor unit
36K BTU/h
Outdoor unit
18/24K BTU/h
Outside diameter Torque
mm inch kgf.m (lbf-ft)
Ø6.35 1/4 1.8 ~ 2.5 (13)
Ø9.52 3/8 3.4 ~ 4.2 (20)
A-UNIT
Gas side piping
B-UNIT
Liquid side piping
Torque wrench
A-UNIT
Gas side piping
B-UNIT
Liquid side piping
C-UNIT
Torque wrench
18 Wall Mounted Multi-Zone Split System Air Conditioner
Connecting the Cable between Indoor Unit and Outdoor Unit
Connecting the Cable between Indoor Unit and Outdoor Unit
Connect the cable to the indoor unit by connecting the wires to the terminals on the control
board individually according to the outdoor unit connection. (Ensure that the color of the wires
of the outdoor unit and the terminal No. are the same as those of the indoor unit.)
The ground wire should be longer than the common wires.
The circuit diagram is subject to change without notice.
When installing, refer to the electrical diagram behind the front panel of Indoor Unit.
The wiring for the outdoor unit can be found on the inside of the Outdoor Unit control cover.
Connect the cable to the Indoor unit
RECOMMENDATION:
• The circuit diagram is subject to change without notice.
• Be sure to connect wires according to the wiring diagram.
• Connect the wires firmly, so that they can not be pulled out easily.
• Connect the wires according to color codes by referring to the wiring diagram.
RECOMMENDATION:
Provide a
circuit breaker between power
source and the outdoor unit as
shown below.
RECOMMENDATION:
The power cord connected to the outdoor unit should
comply with the following specifications: ETL recognized and CSA certified.
The power connecting cable connected to the indoor and outdoor unit
should be comply with the following specifications: ETL recognized and
CSA certified.
Air
Conditioner
Main power source
Circuit Breaker
Use a circuit breaker
or time delay fuse.
RECOMMENDATION: When using the separate wires as the power cord, please secure
the separate wires into the control box panel using tie wraps to hold all wires
together in place.
18 / 24K BTU/h 36K BTU/h
Line voltage (208~230V)
AWG14
GN/YL
20 mm
(0.79 inch)
Line voltage (208~230V)
AWG12 (Allowable temperature
to the wire rated at least 90C˚)
Low voltage (below 40V)
AWG18
GN/YL
20 mm
(0.79 inch)
GN/YL
20 mm
(0.79 inch)
Installation Manual 19
Connecting the Cable between Indoor Unit and Outdoor Unit
Connect the cable to the Outdoor unit
1. Remove the control cover from the unit by
loosening the screws.
Connect the wires to the terminals on the
control board individually per the following.
2. Secure the cable onto the control board with
the holder (clamper).
3. Re-attach the control cover to the original
position using the screws.
:
1. Separately wire the high and low voltage lines.
2. Use heat resistant electrical wiring capable of withstanding temperatures up to 75°C(167°F).
3. Use outdoor waterproof connection cable rated for at least 300V for the connection between
indoor and outdoor unit. (For example, Type SJO-WA)
WARNING:
• Be sure to comply with local and national codes while running the wire from the
indoor unit to the outdoor unit(size of wire and wiring method, etc).
• Every wire must be connected firmly.
• No wire should be allowed to touch refrigerant tubing, the compressor or any
moving parts.
NOTICE
Outdoor unit
Over 5 mm
(0.2 inch)
Holder for
power supply
cord
Connecting
cable
Control cover
Terminal block
Power supply
cable
18K BTU/h
Teminal on the Indoor Unit
A-UNIT
43
Teminal on the Indoor Unit
B-UNIT
4321
Connecting cable(Low voltage)
4321L1 L2
Teminal on the Indoor Unit
43
43
B-UNIT
Teminal on the Outdoor Unit
B IndoorA Indoor
Teminal on the Indoor Unit
B-UNIT
Teminal on the Outdoor Unit
B IndoorA Indoor
4321
Connecting cable(Low voltage)
4321
Teminal on the Indoor Unit
4321
4321
C-UNIT
Teminal on the Outdoor Unit
C Indoor
4321
Connecting cable(Low voltage)
4321
Teminal on the Outdoor Unit Teminal on the Outdoor Unit
Power Source
208/230V AC
(High voltage)
L2L1
Teminal on the Outdoor Unit
Power Source
208/230V AC
(High voltage)
L2L1
Teminal on the Outdoor Unit
Power Source
208/230V AC
(High voltage)
432121
A Indoor B Indoor
24K BTU/h
Teminal on the Indoor Unit
A-UNIT
Teminal on the Outdoor Unit
Teminal on the Indoor Unit
Teminal on the Outdoor Unit
432121
36K BTU/h
A-UNIT
432121
20 Wall Mounted Multi-Zone Split System Air Conditioner
Connecting the Cable between Indoor Unit and Outdoor Unit
(1) Remove two-caps on the conduit panel.
(for low voltage line)
(2) Pull the connection cable through conduit.
(3) After conduit is through the panel, secure the nut
on the opposite side of panel.
(4) Pass the connection cable through the hole.
(5) Properly connect the cable onto the terminal
block.
(6) Secure the connection cable with cord clamp
provided on the unit to reduce strain at the
terminal when the connection cable is pulled
outside up to a 35 pound weight
WARNING: Loose wiring may cause
the terminal to overheat or result in
unit malfunction. A fire hazard may
also exist. Therefore, be sure all
wiring is tightly connected.
When connecting each power wire to the
corresponding terminal, follow instructions "How
to connect wiring to the terminals" and fasten the
wire tightly using the screw on of the terminal
plate.
How to connect wiring to the terminals
For strand wiring
(1) Cut the wire end with a wire cutter or wire-
cutting pliers, then strip the insulation to
expose the strand wiring about 10 mm(3/8").
(2) Using a screwdriver, remove the terminal
screw(s) on the terminal plate.
(3) Using a round terminal fastener or pliers,
securely clamp each stripped wire end with a
round terminal.
(4) Position the round terminal wire, and replace
by tightening the terminal screw using a
screwdriver.
Methods of connecting the cable
High voltage
Low voltage
Strip 10 mm(3/8")
Round
terminal
Connecting cable
Loosening the
terminal block
screw
Fastening the
wire tightly
Strand wire
G
Terminal
block
Lock nut
Power supply line
(1ø, 230/208V)
Conduit panel
Cap(Reuse)
Cord clamp
Hole
(for low voltage line)
Cap(Remove)
Taping
(for sealing)
Low voltage line
(connecting cable)
Installation Manual 21
Connecting the Cable between Indoor Unit and Outdoor Unit
Connect the cable to the indoor unit
CAUTION: Provide a circuit breaker between power source and the unit
as shown below.
Air
Conditioner
Circuit Breaker
Use a circuit
breaker or time
delay fuse.
Main power source
Model Power source
Fuse or breaker
Capacity
1Ø, 230 / 208V
20 A
1Ø, 230 / 208V
25 A
1Ø, 230 / 208V
40 A
18K BTU/h
24K BTU/h
36K BTU/h
1. Connect the wires to the terminals on the
control board individually according to the
outdoor unit connection.
• Ensure that the color of the wires of outdoor
unit and the terminal No. are the same as
those of indoor unit respectively.
2. Attach the Grille onto the cabinet.
• Grasp the lower left and right side of the
Grille and engage four tabs on the top inside
edge of the chassis.
• Press the Grille toward the chassis until it
goes back into place.
Connecting cable
22 Wall Mounted Multi-Zone Split System Air Conditioner
Checking the Drainage, Insulating the Pipe and Special Piping Applications
Checking the Drainage, Insulating the Pipe and Special Piping Applications
Checking the drainage
To check the drainage.
1. Pour a glass of water into the evaporator.
2. Ensure the water flows through the drain
hose of the indoor unit without any leakage
and goes out through the drain exit.
Drain piping
1. The drain hose should point downward for
optimum drainage.
2. Incorrect Installation Examples:
Water
leakage
Accumulated
drain water
Air
Kinking
Water
leakage
Do not raise
Water
leakage
Tip of drain hose
dipped in water
Ditch
Downward slope
Less than
50mm gap
Installation Manual 23
Checking the Drainage, Insulating the Pipe and Special Piping Applications
Insulating the Pipe and Special Piping Applications
Insulate the piping by wrapping the
connecting portion of the indoor
unit with insulation material and
secure it with two kinds of vinyl
tape.
• If you want to connect an additional drain
hose, the end of the drain outlet should be
routed above the ground. Secure the drain
hose appropriately.
In cases where the outdoor unit is
installed below the indoor unit
perform the following:
1. Tape the piping, drain hose and connecting
cable from down to up.
2. Secure the taped piping along the exterior
wall using saddle or equivalent.
In cases where the Outdoor unit is
installed above the Indoor unit
perform the following.
1. Tape the piping and connecting cable from
down to up.
2. Secure the taped piping along the exterior
wall. Form a trap to prevent water entering
the room.
3. Secure the piping onto the wall using a
saddle or equivalent.
Seal a small opening
around the pipings
with gum type sealant.
Trap
Trap
• Trap is required to prevent water from entering
into electrical parts.
Plastic
band
Taping
Drain hose
Pipings
Connecting
cable
Power supply
cord
Seal a small
opening around
the pipings with
gum type sealant.
24 Wall Mounted Multi-Zone Split System Air Conditioner
Air Purging and Evacuation
Air Purging and Evacuation
Air and moisture remaining in the refrigerant system have undesirable effects as indicated below.
1. Pressure in the system rises.
2. Operating current rises.
3. Cooling(or heating) efficiency drops.
4. Moisture in the refrigerant circuit may freeze and block capillary tubing.
5. Water may lead to corrosion of parts in the refrigeration system.
Therefore, the indoor/outdoor unit and connecting tube must be checked for leaks and vacuumed
to remove incondensible gas and moisture in the system.
Preparation
• Check that each tube(both liquid and gas side
tubes) between the indoor and outdoor units have
been properly connected and all wiring for the test
run has been completed. Remove the service
valve caps from both the gas and the liquid sides
on the outdoor unit. Check that both the liquid and
the gas side service valves on the outdoor unit
are kept closed at this stage.
Leakage test
• Connect the manifold valve(with pressure gauges)
and dry nitrogen gas cylinder to this service port
with charge hoses.
CAUTION: Be sure to use a
manifold valve for leak testing.
The high side manifold valve must
always be kept closed.
• Pressurize the system to no more than 150
P.S.I.G. with dry nitrogen gas and close the
cylinder valve when the gauge reading
reached 150 P.S.I.G. Next, test for leaks with
liquid soap.
CAUTION:
To avoid nitrogen
entering the refrigerant system in a
liquid state, the top of the cylinder must be
higher than its bottom when you pressurize
the system. Usually, the cylinder is used in
a vertical standing position.
:
Leakage testing should be done
for each indoor unit connection set,
separately.
1. Do a leakage test of all joints of the
tubing(both indoor and outdoor) and both gas
and liquid side service valves with soap
bubbles.
Bubbles indicate a leak. Be sure to wipe off
the soap with a clean cloth.
2. After the system is found to be free of leaks,
relieve the nitrogen pressure by loosening the
charge hose connector at the nitrogen
cylinder. When the system pressure is
reduced to normal, disconnect the hose from
the cylinder.
NOTICE
Leak Checking
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
Indoor unit
Outdoor unit
Lo Hi
Manifold valve
Pressure
gauge
Installation Manual 25
1. Connect the charge hose end described in
the preceding steps to the vacuum pump to
evacuate the tubing and indoor unit.
Confirm the "Lo" knob of the manifold valve is
open. Then, run the vacuum pump.
The operation time for evacuation varies with
tubing length and capacity of the pump.
[Each Room] The vacuum pump must be
operated less than 0.8torr (0.015 psi) of the
gage pressure.
2. When the desired vacuum is reached, close
the "Lo" knob of the manifold valve and stop
the vacuum pump.
Finishing the job
1. With a service valve wrench, turn the valve
stem of liquid side valve counter-clockwise to
fully open the valve.
2. Turn the valve stem of gas side valve
counter-clockwise to fully open the valve.
3. Loosen the charge hose connected to the
gas side service port slightly to release the
pressure, then remove the hose.
4. Replace the flare nut and its bonnet on the
gas side service port and fasten the flare nut
securely with an adjustable wrench. This
process is very important to prevent leakage
from the system.
5. Replace the valve caps at both gas and liquid
side service valves and fasten them tight.
This completes air purging with a vacuum
pump.
The air conditioner is now ready for test
running.
: Repeat evacuation procedure for each
indoor unit.
NOTICE
Air Purging and Evacuation
Indoor unit
Outdoor unit
Lo Hi
Manifold valve
Vacuum pump
Pressure
gauge
Open
Close
Evacuation
26 Wall Mounted Multi-Zone Split System Air Conditioner
Charging
■
Each outdoor unit is factory charged (see rating plate) for the evaporator as well as a 7.5 m (25 ft) line
set for each indoor line.
Any time total line set is used either shorter or longer then the nominal, which is for Single Zone
= 7.5m, Dual Zone = 15m, and Tri-Zone = 22.5 (Single Zone = 25ft, Dual Zone = 50ft, and Tri
Zone = 75 ft), the line set length the refrigerant charge has to be adjusted.
■ Whether the line set is made shorter or longer you must adjust the charge based on how many ft
of tubing are either added or removed based on 20 g (0.22 oz) of R410A per meter(foot).
Example: A 80 ft line set is used for tri - zone 5 additional ft X 0.22 ounces per foot= add 1.1
ounces of R410A
Important:
If you are ever uncertain of the unit charge, reclaim, evacuate and weigh in the correct charge using
the charge amount specified on the unit's rating plate, adjusting for line sets longer or shorter than
7.5 m(25 ft) for each indoor unit.
Charging
18K BTU/h 30 m (100 ft) 15 m (50 ft) 3 m (10 ft) 7.5 m (25 ft) 7.5 m (25 ft) 20 g/m (0.22 oz/ft)
24K BTU/h 30 m (100 ft) 15 m (50 ft) 3 m (10 ft) 7.5 m (25 ft) 7.5 m (25 ft) 20 g/m (0.22 oz/ft)
36K BTU/h 45 m (150 ft) 15 m (50 ft) 3 m (10 ft) 7.5 m (25 ft) 7.5 m (25 ft) 20 g/m (0.22 oz/ft)
Capacity
Max total
length of all
pipes (A+B+C)
Max length of
each pipe
(A/B/C)
Min length of
each pipe
(A/B/C)
Max Elevation
between each
indoor unit and
outdoor unit (h1)
Max elevation
between
indoor units
(h2)
Additional
Refrigerant
Test Running
Installation Manual 27
1. Check that all tubing and wiring have been properly connected.
2. Check that the gas and liquid side service valves are fully open.
Prepare remote control
Remove the battery cover by pulling it according
to the arrow direction.
Insert new batteries making sure that the (+) and
(–) of battery are installed correctly.
Reattach the cover by pushing it back into
position.
:
• Use 2 AAA(1.5volt) batteries. Do not use
rechargeable batteries.
• Remove the batteries from the remote control if
the system is not going to be used for a long
time.
Evaluation of the performance
Operate all indoor units for 15~20 minutes, then
check the system refrigerant charge:
1.Measure the pressure of one of the gas side
service valves.
2. Measure the temperature of the intake and
discharge of air.
3. Ensure the difference between the intake air
temperature and the discharge air is more
than 8°C(14.4°F).
4. For reference, optimum gas pressure for
cooling is shown below.
:
If the actual pressure is higher than
shown, the system is most likely over-charged, and
charge should be removed. If the actual pressure is
lower than shown, the system is most likely
undercharged, and charge should be added.
NOTICE
NOTICE
Discharge
temperature
Discharge air
Intake temperature
R410A 35°C (95°F)
8.5 ~ 9.5 kg/cm2G (120 ~ 135 P.S.I.G)
Outside ambient
TEMP.
Refrigerant
The pressure of the gas side
service valve.
Important:
❏ Individual zones should be all in the same
operation mode (Heating or Cooling mode)
Test Running
Bolt
Tubing connection
P/No. : MFL3905950203-18-08
Specifications and performance data subject to change without notice.
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