HITACHI RAS-08KH2 Split Unit Air Conditioner Instruction Manual
- July 17, 2024
- Hitachi
Table of Contents
HITACHI RAS-08KH2 Split Unit Air Conditioner
Product Information
Specifications:
- Indoor Unit Model: RAS-08KH2 (8,000 BTU), RAS-10KH2 (10,000 BTU)
- Outdoor Unit Model: RAC-08KH2, RAC-10KH2
- Refrigerant Type: R410A
- Installation Type: Split Unit Air Conditioner
Product Usage Instructions:
1. Safety Precautions:
Read the safety precautions carefully before operating the unit. Incorrect methods of installation may cause death or serious injury. Improper installation may result in serious consequences.
2. Installation Guidelines:
Before starting the installation work, carefully read through the procedures outlined in the installation manual.
The sales agent should inform customers about the correct operation of installation.
3. Tools Needed For Installation Work:
Ensure you have all the necessary tools required for installation work.
4. Electrical Work:
Observe the rules and regulations of electrical installation and follow the methods described in the installation manual when dealing with electrical work.
Use power cables approved by the authorities of your country.
5. Connection and Piping:
Use the specified wire for connecting the indoor and outdoor units. Ensure tight connections to prevent over-heating and fire.
Use the specified piping set for R410A to avoid broken copper pipes or faults.
6. Refrigerant Handling:
Ensure no air or moisture remains in the refrigeration cycle during
installation or removal of the air conditioner to prevent
abnormal pressure buildup.
Ventilate fully in case of a refrigerant gas leak to avoid poisonous gas formation.
7. Post-Installation Checks:
After completion of installation work, check for refrigerant gas leakage to prevent exposure to poisonous gas in case of a fire.
FAQs
- Can I install the air conditioner myself?
- No, please request your sales agent or a qualified technician to install the unit to avoid water leakage, short circuit, or fire hazards.
- What should I do if there is a refrigerant gas leak?
- If a refrigerant gas leak occurs, ensure proper ventilation as contact with fire may lead to poisonous gas formation.
FOR SERVICE PERSONNEL ONLY
SPLIT UNIT AIR CONDITIONER INSTALLATION MANUAL
Indoor Unit
Outdoor Unit
RAS-08KH2 RAS-10KH2
RAC-08KH2 RAC-10KH2
Carefully read through the procedures of proper installation before starting
installation work.
The sales agent should inform customers regarding the correct operation of
installation.
Tools Needed For Installation Work
+ Screwdriver Measuring Tape Knife Saw ø 65mm Power Drill Hexagonal Wrench
Key ( 4mm) Wrench (14, 17, 22mm) Gas Leakage Detector Pipe Cutter Putty Vinyl
Tape Pliers Flare Tool
SAFETY PRECAUTION
Read the safety precautions carefully before operating the unit. The contents
of this section are vital to ensure safety. Please pay special attention to
the following sign.
! WARNING …….. Incorrect methods of installation may cause death or serious
injury. ! CAUTION ……… Improper installation may result in serious consequence.
Be sure that the unit operates in proper condition after installation. Explain
to customer the proper way of operating the unit as described in the user’s
guide.
! WARNING
Please request your sales agent or qualified technician to install your unit.
Water leakage, short circuit or fire may occur if you do the installation work
yourself.
Please observe the instructions stated in the installation manual during the
process of installation. Improper installation may cause water leakage,
electric shock and fire.
Make sure that the units are mounted at locations which are able to provide
full support to the weight of the units. If not, the units may collapse and
impose danger.
Observe the rules and regulations of the electrical installation and the
methods described in the installation manual when dealing with the electrical
work. Use power cables approved by the authorities of your country.
Be sure to use the specified wire for connecting the indoor and outdoor units.
Please ensure that the connections are tight after the conductors of the wire
are inserted into the terminals. Improper insertion and loose contact may
cause over-heating and fire.
Please use the specified components for installation work. Otherwise, the
units may collapse or water leakage, electric shock and fire may occur.
Be sure to use the specified piping set for R410A. Otherwise, this may result
in broken copper pipes or faults.
When installing or removing an air conditioner, do not allow air or moisture
to remain in the refrigeration cycle. Otherwise, pressure in the refrigeration
cycle may become abnormally high so that a rupture may be caused.
Be sure to ventilate fully if a refrigerant gas leak while at work. If the
refrigerant gas comes into contact with fire, a poisonous gas may occur.
After completion of installation work, check to make sure that there is no
refrigeration gas leakage. If the refrigerant gas leaks into the room, coming
into contact with fire in the fan-driven heater, space heater, etc., a
poisonous gas may occur.
Unauthorized modifications to the air conditioner may be dangerous. If a
breakdown occurs please call a qualified air conditioner technician or
electrician. Improper repairs may result in water leakage, electric shock and
fire, etc.
! CAUTION
A circuit breaker or fuse must be installed. Without a circuit breaker or fuse
the danger of electric shock exists. A main switch with a contact gap of more
than 3mm has to be installed in the power supply line to the outdoor unit.
Do not install the unit near a location where there is flammable gas. The
outdoor unit may catch fire if flammable gas leaks around it.
Please ensure smooth flow of water when installing the drain hose. Piping
shall be suitable supported with a maximum spacing of 1m between the supports.
THE CHOICE OF MOUNTING SITE (Please note the following matters and obtain permission from customer before installation).
! WARNING
! WARNING
The unit should be mounted at stable, non-vibratory location which can provide full support to the unit.
The Outdoor unit must be mounted at a location which can support heavy weight. Otherwise, noise and vibration will increase.
INDOOR UNIT OUTDOOR UNIT
! CAUTION
No nearby heat source and no obstruction near the air outlet is allowed.
The clearance distances from top, right and left are specified in figure
below.
The location must be convenient for water drainage and pipe connection with
the Outdoor unit.
To avoid interference from noise please place the unit and its remote
controller at least 1m from the radio, television and inverter type
fluorescent lamp.
To avoid any error in signal transmission from the remote controller, please
put the controller far away from high-frequency machines and high-power
wireless systems.
The installation height of indoor unit must be 2.3m or more in a non public
area.
! CAUTION
Do not expose the unit under direct sunshine or rain. Besides, ventilation
must be good and clear of obstruction.
The air blown out of the unit should not point directly to animals or plants.
The clearances of the unit from top, left, right and front are specified in
figure below. At least 3 of the above sides must be open air. Be sure that the
hot air blown out of the unit and noise do not disturb the
neighbourhood. Do not install at a location where there is flammable gas,
steam, oil and
smoke. The location must be convenient for water drainage. Place the Outdoor
unit and its connecting cord at least 1m away from the
antenna or signal line of television, radio or telephone. This is to avoid
noise interference. Do not install outdoor unit facing strong wind direction.
It may damage the fan motor.
Names of Indoor Components
No.
Item
Qty
Hanger
1
1
The Length of Indoor Unit Connecting Cord
0.8m
1.5m
Figure showing the Installation of Indoor and Outdoor Unit.
! CAUTION
· The installation height
of indoor unit must be 2.3m or more in a non public area.
Screw for Hanger
2
6
(4.1×32)
Holder for Remote
3 Controller
1
AAA Size Battery
4
2
Screw for holder of
5 Remote Controller
2
(3.1×16)
Remote Controller
6
1
Direction of Piping
Horizontally perpendicular to the unit
Connection
There are 4 directions allowed, namely, horizontally perpendicular to the
unit, vertically down from right, horizontally out from right and horizontally
out to left. Don’t form the piping downward at the left of the unit.
Dimension of Mounting Stand of the Outdoor unit
(unit : mm)
mounting stand
35 12
Be sure to completely seal any gap with putty.
8 225
Purifying Filter
7
1
35 500
100
Holder
8
1
Names of Outdoor Components
No.
Item
Qty
Drain Pipe
9
1
Bush
0
2
above 200mm above 50mm when installed on the ceiling of balcony
above 100mm
above 300mm
above 300mm above
must not bend 0.45m
Maximum pipe length 10m Minimum pipe length 5m
above 50mm above 100mm
2 1
above 100mm 2,300mm or more
6 54
3 Plug
The indoor piping should be insulated with the enclosed insulation pipe. (If the insulator is insufficient, please use commersial products).
above 100mm
give clearance as wide as possible
The difference in height between the indoor and outdoor unit should be kept
max 5m.
The connecting pipe, no matter big or small, should all be insulated with
insulation pipe and then wrapped with vinyl tape. (The insulator will
deteriorate if it is not wrapped with tape).
above 200mm
The connection of insulated drain hose.
inner diameter ø 16mm
Please use insulated drain hose for the indoor piping (commercial product).
INDOOR UNIT
1 Installation of Hanger, Wall Penetration and Installation of Protection Pipe
! CAUTION
The draining of the water container inside the indoor unit can be done from
the left. Therefore the hanger must be fixed horizontally or slightly tilted
towards the side of drain hose. Otherwise, condensed water may overflow the
water container.
Installation of the Indoor Unit
VERTICALLY DOWNWARD PIPING
Preparation Connect connecting cord. Pull out the pipe, connecting cord and
drain hose.
Direct Mounting On The Wall
Please use hidden beams in the wall to hold the hanger.
200mm
125mm
Installation The upper part of the Indoor unit is hanged on the hanger.
Connecting cords, pipe and drain hose must be laid together with Vinyl tape.
The projection at the lower part of the Indoor unit is hooked onto the hanger.
Hanger
1 Hanger
125mm
45mm 60mm
80mm 780mm
280mm
45mm
115mm Level
Refrigerating Pipe
Lift the body of the unit upwards and then force it downwards.
Protection
Pipe
Drain Hose Connecting
Cord
2 Projection
! CAUTION
Please pull the lower part of the Indoor unit outwards to check if the unit is
hooked onto the hanger. Improper installation may cause vibration and noise.
Mark
450mm
Hanger
HOW TO REMOVE INDOOR UNIT
Screw for Hanger
Please use more than 4 screws.
Line Weight
Hole for pipe
Procedures of Installation and Precautions
Procedures to fix the hanger.
1. Drill holes on wall. 2. Push plug into the holes.
(As shown below)
(As shown below)
3. Fix the hanger on wall with 4.1 x 32 screw (As shown in figure below)
Push up the (PUSH) sections at the bottom of the indoor unit and pull the
bottom plate towards you. Then the claws are released from the stationary
plate. (The (PUSH) sections are indicated by 2 arrows in the right figure)
HORIZONTAL PIPING
[Push] mark positions
Ceiling
Preparation
Wall
1 Hanger
Plug
above 50mm
Change of Drain Hose and Installation Procedures.
2 Screw
Exchange the location of drain hose and drain cap during horizontal piping as shown in
figure below. Be sure to plug in the drain hose until the insulating material folds upon itself.
32mm
Wall
4.1 x 32 Screw
Please use pliers to pull out the drain cap. (This is an easier way to remove the drain cap).
Procedures to fix the holder of remote control.
1. Drill holes on wall. 2. Push plug into the holes.
(As shown below)
(As shown below)
Wall
20mm
3 Remote Control Holder
5 Screw Plug
Wall Penetration and Installation of Protection Pipe
Drill a ø 65mm hole on wall which is slightly tilted towards the outdoor side.
Drill the wall at a small angle.
Cut the protection pipe according to the wall thickness.
Empty gap in the sleeve of protection pipe should be completely sealed with
putty to avoid dripping of rain water into the room.
Indoor Seal with putty
Protection pipe
WALL
Outdoor 2 ~ 5mm
Seal with putty
Sleeve of protection pipe
! WARNING
Be sure that the wire is not in contact with any metal in the wall. Please use
the protection pipe as wire passing through the hollow part of the wall so as
to prevent the possibility of damaged by mouse. Unless it seals completely,
any air with high humidity flows from outdoor and any dew may drop.
Drain cap
Drain hose
Drain cap
Please insert until here
Drain hose
Please insert until here
! CAUTION Condensed water may leak out if not inserted properly.
HORIZONTAL & DOWNWARD PIPING MAKING OPENINGS
During horizontal or downward piping, use a knife to cut openings as shown in figure. Then smoothen the edges of openings with a file.
Pipe support
Openings
Pull up the pipe after Turn the piping while holding down the lower
bending downward
portion of pipe-support by hand.
INSTALLATION OF REFRIGERATING PIPES AFTER CONNECTION
The refrigerating pipes should be adjusted to fit into the hole on the wall
and then ready for further connection.
The terminals of 2 connected pipes must be covered with insulator used for
terminal connection. Then the pipes are wrapped with insulation pipe.
Connect the connecting cord after removing electrical cover. (Refer to
“CONNECTION OF POWER CORD”)
After adjustment, fit the connecting cord and pipes into the space available
under the indoor unit. Use holder to hold them tight.
Drain hose
Pipe
Connecting cord
! CAUTION
The rubber strap used for
fixing the insulator should
8 Holder Insulation pipe (must be wrapped with vinyl tape at every 120mm).
not be tied with great force. Otherwise, this will damage heat insulation and causes water condensation.
Holder can be attached at the either of 2 places. Please select the easier position.
Pipe
Rubber strap tied with great force
THE CONNECTION OF REFRIGERATING PIPE DURING THE INSTALLATION OF INDOOR UNIT
Preparation To Install Refrigerating Pipes
The refrigerating pipes and connecting cord transform and are attached.
The end of the refrigerating pipes are at locations marked with ” ” symbol.
! CAUTION
Please fix in the plastic core after flaring to avoid plastic chips entering
the pipes.
0.85m
Please bend at a small radius to form an arc
below 5mm
Installation
Hang the Indoor unit onto the hanger. Use the temporary stand at the back of
the Indoor unit to push its lower part 15cm forwards. Place the drain hose
through the hole on the wall. Wrap the refrigerating pipes with insulation
pipe after
connecting refrigerating pipe. Connect the connecting cord after removing
electrical cover.
(Refer to “Connection of Power Cord”) After adjustment, the connecting cord
and refrigerating pipes
are placed into the space available under the Indoor unit. The projection of
Indoor unit must hook to the hanger.
Projection
Hook about 15cm
Heat insulation pipe
Connecting cord Refrigerating pipe
Pull this to the front during the connection of refrigerating pipes to ease task.
Protection pipe Drain hose
Connecting cord
Holder Connected section
3 Installation of Drain Hose
! CAUTION
Bending upwards
Condensed water pond
Ditch
Condensed water pond
Be sure that the drain hose is not loosely connected or bend.
!
You are free to choose the side (left or right) for the installation of drain
hose. Please ensure the smooth flow of condensed water of the Indoor
CAUTION unit during installation. (Carelessness may result in water leakage.)
OUTDOOR UNIT
100 mm ABOVE
INSTALLATION OF REFRIGERATING PIPES AND AIR REMOVAL
Mount the outdoor unit on stable ground to prevent vibration and increase of
noise level.
Decide the location for piping after sorting out the different types of pipe
available.
Procedure to remove the cover of wiring terminals
Remove the screw (1 piece).
Hold the projected part at the lower left of the cover and push the cover
upwards to remove it.
To close the cover,
Hook
insert the upper part of the cover into the body of outdoor unit, then be sure
that the hook below the cover is plugged in before screwing.
Please face this side (suction side) of the unit to the wall
Please remove the cover for wire connection.
CONDENSED WATER DISPOSAL OF OUTDOOR UNIT There are holes on the base of
Outdoor unit for condensed water to exhaust. In order to flow condensed water
to the drain, the unit is installed on a stand or a block so that the unit is
100mm above the ground as shown figure. Join the drain pipe to one hole. At
first insert one portion of the hook to the base (Portion A), then pull the
drain pipe in the direction shown by the arrow while inserting the hook into
the base. After installation, check whether the drain pipe cling to the base
firmly.
A
BASE
DRAIN PIPE
10 Bush
9 Drain Pipe
When using in cold region, etc.
In cold region with severe cold climate and heavy snow, water discharged from
heat exchanger freeze on the base surface and this may affect drainage. In
such a region, remove bush on the bottom face of outdoor unit for better
drainage. When using drainpipe, consult our dealer.
1 Preparation of Pipe
Use a pipe cutter to cut the copper pipe.
Copper pipe
Trimming tool
! CAUTION
Jagged edge will cause leakage. Point the side to be trimmed downwards during
trimming to prevent copper
chips from entering the pipe.
Before flaring, please put on the flare nut.
Die
Die
A
Please use exclusive
tool
Copper pipe
3 Removal Of Air From The Pipe And Gas Leakage Inspection
Procedures of using Vacuum Pump for Air Removal
As shown in right figure, remove the cap of valve core. Then, connect the
charge
1 hose. Remove the cap of valve head.
Connect the vacuum pump adapter to the vacuum pump and connect the charge hose
to the adapter.
Fully tighten the “Hi” shuttle of the
manifold valve and completely unscrew
2
the “Lo” shuttle. Run the vacuum pump for about 1015 minutes, then completely
tighten the “Lo” shuttle and switch off
the vacuum pump.
When the meter reaches – 101KPa (-76cmHg) during pumping, fully tighten the
shuttle.
Meter showing pressure
Closed
Lo Hi Charge hose Valve
Valve
R410A Manifold valve
Vacuum pump
Vacuum pump adapter
When pumping starts, slightly loosen the flare nut to check of air sucked in. Then tighten the flare nut.
AIR REMOVAL
Outer Diameter (mm)
6.35 9.52
A (mm)
For R410A tool
0.0 ~ 0.5mm 0.0 ~ 0.5mm
For R22 tool 1.0mm 1.0mm
Completely unscrew the spindle of the
3
service valve (at 2 places) in anticlockwise direction to allow the flow of
coolant (using Hexagonal Wrench key).
2 Pipe Connection
In case of removing flare nut of an Indoor unit, first remove a nut
! CAUTION of small diameter side, or a seal cap of big diameter side will fly
out. Prevent water from entering into the piping when working.
Please be careful when bending the copper pipe.
Screw in manually while adjusting the center. After that, use of torque wrench to
tighten the connection.
Outer
Torque N·m
dia.of pipe
(kgf · cm)
Flare nut
Small dia. side Large dia. side
6.35 (1/4″) 13.7 18.6 (140 190) 9.52 (3/8″) 34.3 44.1 (350 450)
Wrench
Torque wrench
Valve Small dia. side head cap Large dia. side
Valve core cap
6.35 (1/4″) 19.6 24.5 (200 ~ 250) 9.52 (3/8″) 19.6 24.5 (200 ~ 250)
12.3 15.7 (125 ~ 160)
Remove the charge hose and tighten the
4
cap of valve head. Check the cap’s periphery if there is any gas leakage.
The task is then completed.
Gas Leakage Inspection
Please use gas leakage detector to check if leakage occurs at the connection
of Flare nut as shown on the right.
If gas leakage occurs, further tighten the connection to stop leakage.
The body of service valve
Cap of valve head
Cap of valve core
Hexagonal Wrench Key
Cap of valve head
! WARNING THIS APPLIANCE MUST BE EARTHED.
Procedures of Wiring
In case that power is supplied from Indoor Unit
Line Cord
Indoor Unit
L N
ABCD
AC 220-240V
Outdoor Unit
ABCD 2.0 Connecting Cord
Wiring Of The Indoor Unit
For wire connection of the Indoor unit, you need to remove low cover and front
cover. Method to remove front cover. Refer to “FINAL STAGE OF INSTALLATION
How to Remove The Front Cover”.
Method to remove the low cover
Pull the cover at 1 and 2 in the directions as shown by arrows to remove the
cover.
1.6 or 2.0
Indoor Unit
Outdoor Unit
Power line 30mm 10mm
Control line 30mm 10mm
10mm 70mm 25mm
10mm
GRN + YEL
Strip wires
25mm 10mm
GRN + YEL
10mm 35mm
! WARNING
The naked part of the wire core should be 10 mm and fix it to the terminal
tightly. Then try to pull the individual wire to check if the contact is
tight. Improper insertion may burn the terminal.
Be sure to use only power cables approved from the authorities in your
country. For example in Germany: Cable type: NYM 3×1.5mm2.
Please refer to the installation manual for wire connection to the terminals
of the units. The cabling must meet the standards of electrical installation.
There is an AC voltage drop between the L and N terminals if power is on.
Therefore, before servicing, be sure to remove the plug from the AC outlet or
switch off the main switch.
Wiring of The Outdoor Unit
Please remove the side cover for wire connection.
!
WARNING
If you cannot attach the side cover due to the connecting cord, press the
connecting cord in direction to the front panel to fix it.
Be sure that the hooks of the side cover is fixed in certainly. Otherwise
water leakage may occur and this causes short circuit or faults.
The connecting cord should not touch to service valve and pipes. (It becomes
high temperature in heating operation.)
Checking for the electric source and
the voltage range
Before installation, the power source must be checked and necessary wiring
work must be completed. To make the wiring capacity proper, use the wire
gauges list below for the lead-in from a pole transformer and for the wiring
from a switch board of fuse box to the main switch and outdoor unit in
consideration of the locked rotor current.
IMPORTANT
Cable length up to 16m up to 15m up to 25m
Wire cross-section 1.6mm2 2.5mm2 4.0mm2
After remove the screw and cover, and put the connecting cords and fix the cover with screw.
A
B
CD
Connection wire
Side cover
Connection wire is put under here
Screw for earth line
Investigate the power supply capacity and other electrical conditions at the installation location. Depending on the model of room air conditioner to be installed, request the customer to make arrangements for the necessary electrical work etc. The electrical work includes the wiring work up the outdoor. In localities where electrical conditions are poor, use of a voltage regulation is recommended.
IMPORTANT
Fuse Capacity 10A time delay fuse
CONNECTION OF POWER CORD
FINAL STAGE OF INSTALLATION
1 Insulation And Maintenance Of Pipe Connection
The connected terminals should be completely sealed with heat insulator and
then tied up with rubber strap.
Please tie the pipe and power line together with vinyl tape as shown in the
figure showing the installation of Indoor and Outdoor units. Then fix their
position with holders.
To enchance the heat insulation and to prevent water condensation, please
cover the outdoor part of the drain hose and pipe with insulation pipe.
Completely seal any gap with putty.
Insulation material for pipe connection
2 Installation Of Remote Controller
The remote controller can be placed in its holder which is fixed on wall or
beam.
To operate the remote controller at its holder, please ensure that the unit
can receive signal transmitted from the controller at the place where the
holder is to be fixed. The unit will beep when signal is received from the
remote controller. The signal transmission is weaken by the fluorescent light.
Therefore, during the installation of the remote control holder, please switch
on the light, even during day time, to determine the mounting location of the
holder.
Sleeve of protection pipe
Putty
Putty
3 Power Source And Operation Test
The controller must be hooked onto the hook at the lower part of the holder. Push in the remote controller in the direction as shown in figure below.
Screw (2 pieces)
Remote Controller
Holder for Remote Controller
Power Source
Operation Test
! CAUTION
Please use a new socket. Accident may occur due to the use of old socket
because of poor contact.
Please plug in and then remove the plug for 2 3 times. This is to ensure
that the plug is completely plugged into the socket.
Keep additional length for the power cord and do not render the plug under
external force as this may cause poor contact.
Do not fix the power cord with U-shape nail.
Please ensure that the air conditioner is in normal operating condition during
the operation test.
Explain to your customer the proper operation procedures as described in the
user’s manual.
How to Remove The Front Cover
1 Remove the front panel. Please remove and attach the front panel by both
hands.
1 After opening the front panel by both hands. Undo the right arm while
pushing it inside.
2 Slide the front panel to right as shown in figure. Then remove while pulling
it to front. 2 Remove the filters. 3 After removing two screws, pull the
center of the front cover towards you and release the claws. 4 Pull the side
faces (lower sections) of the front cover towards you as shown in the figure
and remove the cover.
How to Attach the Front Cover
1 Check that the drain pan is securely attached.
2 After installing the front cover onto the unit, hook three claws at upper
side of the cover securely. Then, push the center of the front cover to lock
the claws.
3 Tighten the two screws.
4 Install the filter.
5 Slide the shafts of the right and left arms on the washable panel along the
steps to insert the shafts into the holes till they stop. After checking that
the shafts are securely inserted, close the panel.
Shaft
Hole
Step