Western Airconditioning SCVH12A-A1NA I Operating manual

Content
This marking indicates that this product should not be disposed with other
household wastes throughout the EU. To prevent possible harm to the
environment or human health from uncontrolled waste disposal, recycle it
responsibly to promote the sustainable reuse of material resources. To return
your used device, please use the
return and collection systems or contact the
retailer where the product was purchased.
They can take this product for
environmental safe recycling.
Safety Precautions ..........................................................................................1
Outline of the Unit and Main Parts.................................................................4
Preparative for Installation .............................................................................5
Standard Accessory Parts ...........................................................................5
Selection of the Installation Location...........................................................6
Installation of the Unit.....................................................................................7
Installation of the Indoor Unit.......................................................................7
Installation of the Connection Pipe............................................................10
Installation of the Drain Hose ....................................................................13
Electrical Wiring.........................................................................................16
The Panel Installation................................................................................19
Test Running..................................................................................................21
Trial Operation and Testing........................................................................21
Working Temperature Range.....................................................................22
Troubleshooting and Maintenance ..............................................................23
Troubleshooting .........................................................................................23
Routine Maintenance.................................................................................24

1
Safety Precautions
WARNING!
CAUTION!
This mark indicates procedures which, if improperly performed,
might lead to the death or serious injury of the user.
This mark indicates procedures which, if improperly performed,
might possibly result in personal harm to the user, or damage to
property.
WARNING!
This appliance is not intended for use by persons (including
children) with reduced physical, sensory or mental capabilities,
or lack of experience and knowledge, unless they have been
given supervision or instruction concerning use of the appliance
by a person responsible for their safety.
Children should be supervised to ensure that they do not play
with the appliance.
Installation should be left to the dealer or another professional.
Improper installation may cause water leakage, electrical shock,
or re.
Install the air conditioner according to the instructions given in
this manual. Incomplete installation may cause water leakage,
electrical shock, or re.
Be sure to use the supplied or specied installation parts.
Use of other parts may cause the unit to come to lose, water
leakage, electrical shock, or re.
Install the air conditioner on a solid base that can support the
weight of the unit. An inadequate base or incomplete installation
may cause injury in the event the unit falls off the base.
Electrical work should be carried out in accordance with the
installation manual and the national electrical wiring rules or
code of practice. Insufcient capacity or incomplete electrical
work may cause electrical shock or re.
The appliance shall be installed in accordance with national
wiring regulations

2
Be sure to use a dedicated power circuit. Never use a power
supply shared by another appliance.
For wiring, use a cable length enough to cover the entire
distance with no connection. Do not use an extension cord. Do
not put other loads on the power supply, use a dedicated power
circuit. (Failure to do so may cause abnormal heat, electric
shock or re.)
Use the specied types of wires for electrical connections
between the indoor and outdoor units. Firmly clamp the
interconnecting wires so their terminals receive no external
stresses. Incomplete connections or clamping may cause
terminal overheating or re.
After connecting interconnecting and supply wiring be sure
to shape the cables so that they do not put undue force on
the electrical covers or panels. Install covers over the wires.
Incomplete cover installation may cause terminal overheating,
electrical shock, or re.
If any refrigerant has leaked out during the installation work,
ventilate the room. (The refrigerant produces a toxic gas if
exposed to ames.)
After all installation is complete, check to make sure that no
refrigerant is leaking out. (The refrigerant produces a toxic gas
if exposed to ames.)
When installing or relocating the system, be sure to keep the
refrigerant circuit free from substances other than the specied
refrigerant (R410A), such as air. (Any presence of air or other
foreign substance in the refrigerant circuit causes an abnormal
pressure rise or rupture, resulting in injury.)
During pump-down, stop the compressor before removing the
refrigerant piping. If the compressor is still running and the stop
valve is open during pump-down, air will be sucked in when the
refrigerant piping is removed, causing abnormal pressure in the
freezer cycle which will lead to breakage and even injury.
Safety Precautions

3
Safety Precautions
During installation, attach the refrigerant piping securely before
running the compressor. If the compressor is not attached and
the stop valve is open during pump-down, air will be sucked in
when the compressor is run, causing abnormal pressure in the
freezer cycle which will lead to breakage and even injury.
Be sure to establish an earth. Do not earth the unit to a utility
pipe, arrester, or telephone earth. Incomplete earth may cause
electrical shock, or re. A high surge current from lightning or
other sources may cause damage to the air conditioner.
Be sure to install an earth leakage breaker. Failure to install an
earth leakage breaker may result in electric shocks, or re.
If the supply cord is damaged, it must be replaced by the
manufacturer, its service agent or similarly qualied persons in
order to avoid a hazard.
CAUTION!
Do not install the air conditioner in a place where there is
danger of exposure to inammable gas leakage. If the gas leaks
and builds up around the unit, it may catch re.
Establish drain piping according to the instructions of this
manual. Inadequate piping may cause ooding.
Tighten the are nut according to the specied method such
as with a torque wrench. If the are nut is tightened too hard,
the are nut may crack after a long time and cause refrigerant
leakage.

4
Outline of the Unit and Main Parts
Indoor
Display
Drain pipe Connect pipe
Air outlet Air outlet
Air inlet panel
NOTE
● The connection pipe and duct for this unit should be prepared by the user.
● The unit is standard equipped with rectangular duct.
Remote controller
TIMERTIMER
ON
LIGHTECO
QUIET
CLOCK
I FEEL
OFF
HEALTH
CLEANTEMP
MODE FAN
TURBO SLEEP
Temp.indicator
Power indicator

5
Preparative for Installation
Standard Accessory Parts
The standard accessory parts listed below are furnished and should be used as required.
Table 1
Indoor
Unit
Name Appearance Q’ty Usage
Remote controller 1 To control the indoor uint
Drain pipe 1 To connect with the hard
PVC drain pipe
Nut 2 To connect the pipe
Nut 4 To install the indoor unit
Insulation 1 To insulate the gas pipe
Insulation 1 To insulate the liquid pipe
Fastener 4 To fasten the sponge
Installation
paperboard 1 used for ceiling drilling
Screw 4 To x the installation
paperboard
Others Instructions、bar code
TIMERTIMER
ON
LIGHTECO
QUIET
CLOCK
I FEEL
OFF
HEALTH
CLEANTEMP
MODE FAN
TURBO SLEEP

6
Preparative for Installation
Selection of the Installation Location
WARNING!
CAUTION!
The unit must be installed where strong enough to withstand the weight of the unit and xed
securely, otherwise the unit would topple or fall off.
● Do not install where there is a danger of combustible gas leakage.
● Do not install the unit near heat source, steam, or ammable gas.
● Children under 10 years old must be supervised not to operate the unit.
1. Obstruct should be put away from the intake or outlet vent of the indoor unit so that the
airow can be blown through all the room.
2. Make sure that the installation meets the requirement of the schematic diagram of
installation spaces.
3. Select the place where can stand 4 times of the weight of the indoor unit and would not
increase the operating noise and vibration.
4. The horizontality of the installation place should be guaranteed.
5. Select the place where is easy to drain out the condensate water, and connect with
outdoor unit.
6. Make sure that there are enough space for care and maintenance, and the height fall
between the indoor unit and ground is above 2300mm.
7. When installing the suspension bolt, check if the installation place can stand 4 times of the
weight of the unit. If not, reinforce it before installation.
Note:
There will be large amount of greasy
dirt accumulated on the fan, heat
exchanger and water pump located in
the dinning room and kitchen, which
would reduce the capacity of the
heater exchanger, lead to leakage
and abnormal operation of the water
pump.
Decide the installation location with the customer as follows:
Indoor Unit
≥20mm
≥1500mm≥1500mm ≥2300mm
Fig.1

7
Installation of the Unit
Installation of the Indoor Unit
1. Indoor unit dimension
WARNING!
● Install the indoor unit in a location which can withstand a load of at least ve times the
weight of the main unit and which will not amplify sound or vibration.
● If the installation location is not strong enough, the indoor unit may fall and cause injuries.
● If the job is done with the panel frame only, there is a risk that the unit will come loose.
Please take care.
A
E
G
C
BF
H
D
Fig.2
Table 2 Units: mm
Installation Dimension The Ceiling
Dimension Panel Dimentsion
A B C D E F G H
769 698 766 766 900 900 950 950

8
Washer nut
Plain washer
Nut
Spring washer
(2) Insert the expansion bolts into the hole until it
is reliable, then t the lifting screw into the
expansion bolt.
Notice: Please adjust the length of the lifting
screw according to the height of the
ceiling when installation.
The length of the lifting screw = The height of the ceiling - The height of the lifting frame + L
(the remaining length L usually is 1/2 the length of the lifting screw.)
The height of the ceiling
15-25mm
L
The height of the lifting frame
The ceiling
Installation of the Unit
2. Installing the Main Body Unit
● Installation of the unit with old ceiling (The ceiling must be level.)
1. Please punching holes in the ceiling with the instruction on the installation model paper.
Notice:
(1) Holes in the ceiling must has the same center with the air conditioning main body.
(2)
Before installation, please complete all pipes and wires connection to the indoor machine.
(3) To maintain the ceiling level and prevent vibration, please strengthen the intensity of
the ceiling if necessary.
2. Fit boom on the ceiling according to the hole position on the installation model paper.
(1) Punch 4 holes in the hole position after putting the installation model paper on the
ceiling as the picture shows. The diameter of holes refers to the expansion bolt’s, and
it's 60mm to 70mm depth.
3. Installing the air conditioner main body
(1) Fit the air conditioner main body on the lifting screw with the special nuts.
(2) Adjust the position of the main body, ensure the ceiling edges evenly spaced and the
underside of the main body is recessed the ceiling 15 to 25 mm.
60-70mm
Punch
position
Installation
model paper
Fig.3
Fig.4
Fig.5

9
Washer nut
Plain washer
Nut
Spring washer
Screw
Installation
model paper
4. Ensure the air conditioner is level
Ensure the four angles of the unit are level
one by one with a spirit level.
(If products tilt the xed pump to the
opposite direction, oat switch failure may
occur, resulting in drop of water.)
5. Ensure the air conditioner is level and t the air conditioner main body by fastening nuts to
the lifting screws.
a spirit level
Fig.8
Fig.6
Installation of the Unit
● Installation of the unit with the new ceiling
1. Fit boom on the ceiling according to the hole position on the installation model paper.
(Bolts can be pre-embedded in the new ceiling, if it can bear the weight of the indoor
machine when the concrete shrinks.)
(1) Punch 4 holes in the hole position after putting the installation model paper on the
ceiling. The diameter of holes refer to the expansion bolt’s, and it's 60mm to 70mm
depth.
(2) Insert the expansion bolts into the hole until it is reliable, then t the lifting screw into
the expansion bolt.
2. Installing the air conditioner main body
(1) Fit the air conditioner main body on the lifting screw with the special nuts.
(2) Predetermine the opening size and location on the ceiling for the installation of the air
conditioner main body by xing the installation model paper on the air conditioner main
body with screws.
60-70mm
Punch
position
Installation
model paper
Fig.7
Fig.9

10
ĸh
Installation of the Unit
1. Flare Processing
2. Bending Pipes
(1). Cut the connection pipe with the pipe cutter and remove the burrs.
(2). Hold the pipe downward to prevent cuttings from entering the pipe.
(3). Remove the are nuts at the stop valve of the outdoor unit and inside the accessory bag
of the indoor unit, then insert them to the connection pipe, after that, are the connection
pipe with a aring tool.
(4). Check if the are part is spread evenly and there are no cracks (see Fig.11).
(1). The pipes are shaped by your hands. Be careful not to collapse them.
Installation of the Connection Pipe
Fig.11
Fig.12
Extend the pipe by unwinding it
Fig.10
3. Remove the installation model paper after ceiling installation.
4. Adjustment
Adjust the position of the main body, ensure
the ceiling edges evenly spaced and the
underside of the main body is recessed the
ceiling 5 to 25 mm.
(If products tilt the xed pump to the
opposite direction, oat switch failure may
occur, resulting in drop of water.)
5. Ensure the air conditioner is level and t the air conditioner main body by fastening nuts to
the lifting screws.
a spirit level

11
Installation of the Unit
(2). Do not bend the pipes in an angle more than 90°.
(3). When pipes are repeatedly bent or stretched, the material will harden, making it difcult
to bend or stretch them any more. Do not bend or stretch the pipes more than three
times.
(4). When bending the pipe, do not bend it as is. The pipe will be collapsed. In this case, cut
the heat insulating pipe with a sharp cutter as shown in Fig.13, and bend it after exposing
the pipe. After bending the pipe as you want, be sure to put the heat insulating pipe back
on the pipe, and secure it with tape.
3. Connecting the Pipe at the Indoor Unit Side
Fig.13
Pipe
Cutter
Cutt line
Heat insulating pipe
CAUTION!
CAUTION!
● To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of
curvature of 150 mm or over.
● If the pipe is bent repeatedly at the same place, it will break.
● Be sure to apply the pipe against the port on the indoor unit correctly. If the centering is
improper, the are nut cannot be tightened smoothly. If the are nut is forced to turn, the
threads will be damaged.
● Do not remove the are nut until the connection pipe is to be connected so as to prevent
dust and impurities from coming into the pipe system.
Detach the caps and plugs from the pipes.
CAUTION!
Hold the torque wrench at its grip, keeping it in the right angle with the pipe as shown in
Fig.14, in order to tighten the are nut correctly.
Centering the pipe against port on the indoor unit, turn the are nut with your hand.

12
Installation of the Unit
When the are nut is tightened properly by your hand, use a torque wrench to nally tighten it.
Holding spanner
Torque wrench
Fig.14
Fig.15
Table 3 Flare nut tightening torque
Pipe Diameter (Inch) 1/4˝ 3/8˝ 5/8˝ 1/2˝ 3/4˝ 7/8˝
Tightening Torque (N·m) 15-30 35-40 60-65 45-50 70-75 80-85
CAUTION!
Be sure to connect the gas pipe after connecting the liquid pipe completely.
Stick coupler heat insulation (large and small) to the place where connecting pipes.
Fig.16
4. Heat Insulation on the Pipe Joints (Indoor Side Only)

13
Installation of the Unit
Installation of the Drain Hose
● Installation of Drain Piping
CAUTION!
Install the drain hose in accordance with the instructions in this installation manual and keep
the area warm enough to prevent condensation. Problems with the piping may lead to water
leaks.
1. Keep piping as short as possible and slope it downwards at a gradient of at least 1/100 so
that air may not remain trapped inside the pipe.
2. Keep pipe size equal to or greater than that of the connecting pipe.
3. Install the drain piping as shown and take measures against condensation. Improperly
rigged piping could lead to leaks and eventually wet furniture and belongings.
1. Insert the drain pipe to the drain outlet of the unit and then tighten the clamp securely with
tape.
2. Connect the extension drain pipe to the drain pipe and then tighten the clamp with tape.
Indoor unit
drain hose
Insulating tape
(accessory)
Insulating tube
(commercially
available)
Extension drain piping
(commercially available)
Fig.17
1
2
≤ 4mm
1 2
3
Tighten the clamp until the screw head is less
then 4mm from the hose.
Metal clamp
Drain hose (accessory)
Grey tape (accessory)
Insulate the pipe clamp and the drain hose using heat
insulation sponge.
Metal clamp (accessory)
Insulation sponge (accessory)
Fig.18 Fig.19
● Installing the Drain Pipes

14
Indoor unit Indoor unit Indoor unit
Joint
Joint
100 mm
T-joint converging drain pipes
T-joint converging drain pipes
mm0001~0
Installation of the Unit
Fig.20
3. When unifying multiple drain pipes,
install the pipes as Fig.20. Select
converging drain pipes whose
gauge is suitable for the operating
capacity of the unit.(take the cass-
ette type unit for example)
Fig.21
3-way connection of
drainage pipe joint
Connection of
drain elbow
Connection of
horizontal pipe
4. When the drain hose cannot keep a sufcient gradient, it is necessary to t a riser pipe
(eld supplied) to it.
5. If the air ow of indoor unit is high, this might cause negative pressure and result in return
suction of outdoor air. Therefore, U-type water trap shall be designed on the drainage side
of each indoor unit.(Fig.21)
6. Install one water trap for each unit.
7. Installation of water trap shall consider easy cleaning in the future.
8. Connection of drainage branch pipe to the stand pipe or horizontal pipe of drainage main
pipe
The horizontal pipe cannot be connected to the vertical pipe at a same height. It can be
connected in a manner as shown below:
NO.1: Attach the 3-way connection of the drainage pipe joint as shown in Fig.22.
NO.2: Attach the drain elbow as shown in Fig.23.
NO.3: Attach the horizontal pipe as shown in Fig.24.
Fig.22 Fig.23 Fig.24

15
Drain hose
<Immiting water from the rest hole>
Plastic water pot (The length of
the pipe should be about 100mm.)
<Immiting water from the outlet vent terminal>
Above
100mm
Installation of the Unit
● Precautions When Doing Riser Piping Work
● Testing of Drain Piping
1. Make sure that heat insulation work is executed on the following 2 spots to prevent any
possible water leakage due to dew condensation.
1). Connect the drain hose to the drain lift pipe, and insulate them.
2). Connect the drain hose to the drain outlet on the indoor unit, and tighten it with the
clamp.
2. Make sure the lift pipe is at most 280mm.
3. Stand the lift pipe vertically, and make sure it is not further than 300mm from the base of
the drain outlet.
4. Secure a downward gradient of 1/100 or more for the drain pipe. To accomplish this,
mount supporting brackets at an interval of 1 -1.5 m.
After piping work is nished, check if
drainage ows smoothly. Shown in the
Fig.26, Add approximately 1liter of
water slowly into the drain pan and
check drainage ow during COOL
running.
Drain lift pipe
Ceiling Clamp (attachment)
Roof
Drain hose
(attachment)
Hoisting
stand
1-1.5m
≤300mm
Fig.25
Fig.26

16
Installation of the Unit
Electrical Wiring
1. Wiring Precautions
2. Electrical Wiring
WARNING!
● Before obtaining access to terminals, all supply circuits must be disconnected.
● Before turning on, verify that the voltage is within the 198~264V range (for single phrase
unit) or 342~457V range (for three-phrase unit).
● Always use a special branch circuit and install a special receptacle to supply power to the
air conditioner.
● Use a special branch circuit breaker and receptacle matched to the capacity of the air
conditioner.
● The special branch circuit breaker is installed in the permanent wiring. Always use a circuit
that can trip all the poles of the wiring and has an isolation distance of at least 3mm
between the contacts of each pole.
● Perform wiring work in accordance with standards so that the air conditioner can be
operated safely and positively.
● Install a leakage special branch circuit breaker in accordance with the related laws and
regulations and electric company standards.
CAUTION!
● The power source capacity must be the sum of the air conditioner current and the current
of other electrical appliances. When the current contracted capacity is insufcient, change
the contracted capacity.
● When the voltage is low and the air conditioner is difcult to start, contact the power
company to raise the voltage.
(1). For solid core wiring (Fig.27)
1). Cut the wire end with a wire cutter or wire-cutting pliers, then strip the insulation about
25mm (15/16") .
2). Using a screwdriver, remove the terminal screw(s) on the terminal board.
3). Using pliers, bend the solid wire to form a loop suitable for the terminal screw.
4). Shape the loop wire properly, place it on the terminal board and tighten securely with
the terminal screw using a screwdriver.
(2). For strand wiring (Fig.27)
1). Cut the wire end with a wire cutter or wire-cutting pliers, then strip the insulation about
10mm (3/8") .

17
Installation of the Unit
2). Using a screwdriver, remove the terminal screw (s) on the terminal board.
3). Using a round terminal fastener or pliers, securely clamp a round terminal to each
stripped wire end.
4). Position the round terminal wire, and replace and tighten the terminal screw with a
screwdriver.(Fig.28)
(3). How to x connection cord and power cord by cord clamp
After passing the connection cord and power cord through the insulation tube, fasten it with
the cord clamp.(Fig.29)
Solid wire Strand wire
Solderless terminal
Insulation laver
Fig.28
Fig.27
Fig.29
Screw with
special washer
Wire
Wire
Terminal
board
Round
terminal
Round
terminal
Insulation tube
Insulation tube
Cord clamp
CAUTION!
● Before starting work, check that power is not being supplied to the indoor unit and outdoor
unit.
● Match the terminal block numbers and connection cord colors with those of the indoor unit
side.
● Erroneous wiring may cause burning of the electric parts.
● Connect the connection cords rmly to the terminal block. Imperfect installation may cause
a re.
● Always fasten the outside covering of the connection cord with cord clamps. (If the
insulator is not clamped, electric leakage may occur.)
● Always connect the ground wire.

18
Installation of the Unit
(4). Electric wiring of indoor unit side
Remove the electric box cover from the electric box sub-assy and then connect the wire.
N(1) 23
electric box
cover
CAUTION!
● The power cord and the wire of the fresh air valve are high-voltage, while the
communication cord and connection wire of the wired controller are low-voltage. They
should run separately against electromagnetic interference.
● The high-voltage and low-voltage lines should pass through the rubber rings at different
electric box covers.
● Do not bundle the connection wire of the wired controller and the communication cord
together, or arrange them in parallel, otherwise improper operation would occur.
● The high-voltage and low-voltage lines should be xed separately and securely, with
internal big clamps for the former and small clamps for the latter.
● Tighten the indoor/outdoor connection cord and power cord respectively on the terminal
boards with screws. Faulty connection may cause a re.
● If the indoor unit connection cord (to the outdoor unit) and power supply are wired
incorrectly, the air conditioner may be damaged.
● Connect the indoor unit connection cord properly based on the corresponding marks.
● Ground both the indoor and outdoor units by attaching a ground wire.
● Unit shall be grounded in compliance with the applicable local and national codes.
Fig.30