Wiring Of The Indoor Unit; Procedures Of Wiring - Hitachi RAK-18NH6 Installation Manual

1 Preparation of Pipe
Use a pipe cutter to cut the copper pipe.
G
Trimming tool
Copper pipe
CAUTION
!
G Jagged edge will cause leakage.
G Point the side to be trimmed downwards during trimming to
prevent copper chips from entering the pipe.
G Before flaring, please put on the flare nut.
Die
Die
A
Copper pipe
G Recommend to use
R410A flaring tool.
A (mm)
Outer
Diameter (mm)
For R410A tool For R22 tool
~
6.35 0.0 0.5mm 1.0mm
~
9.52 0.0 0.5mm 1.0mm
~
12.7 0.0 0.5mm 1.0mm
! WARNING G THIS APPLIANCE MUST BE EARTHED.
Power supply shall be connected at the rated voltage, otherwise the unit will be broken or could not reach the
specified capacity.

Procedures of Wiring

In case that power is supplied from Indoor Unit
Indoor Unit
30mm
10mm
10mm
70mm
Strip wires
WARNING
!
G 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:
G
Cable type: NYM 3x1.5mm 2 .
G Please refer to the installation manual for wire connection to the terminals of the units. The cabling must
meet the standards of electrical installation.
G There is a AC voltage of 230V between the L and N terminals. Therefore, before servicing, be sure to
remove the plug from the AC outlet or switch off the main switch.
1 Insulation And Maintenance Of Pipe Connection
G The connected terminals should be completely sealed with
heat insulator and then tied up with rubber strap.
G 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
G
condensation, please cover the outdoor part of the drain hose
and pipe with insulation pipe.
G Completely seal any gap with putty.
Insulation material for pipe connection
Sleeve of
protection pipe
Putty
Putty
3 Power Source And Operation Test
Power Source
CAUTION
!
G 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
G
ensure that the plug is completely plugged into the socket.
G Keep additional length for the power cord and do not render the
plug under external force as this may cause poor contact.
G Do not fix the power cord with U-shape nail.
< >
IA194: A
2 Pipe Connection
In case of removing flare nut of an
Indoor unit, first remove a nut of small
diameter side, or a seal cap of big
CAUTION
!
diameter side will fly out. Prevent
water from entering into the piping
when working.
Flare nut
Wrench Torque
wrench
Outer
dia.of pipe
Small dia. side 6.35 (1/4") 13.7 – 18.6 (140 – 190)
Large dia. side
9.52 (3/8") 34.3 – 44.1 (350 – 450)
12.7 (1/2")
44.1 – 53.9 (450 – 550)
19.6 – 24.5 (200 ~ 250)
Valve Small dia. side 6.35 (1/4")
head cap
Large dia. side
9.52 (3/8")
19.6 – 24.5 (200 ~ 250)
12.7 (1/2") 29.4 – 34.3 (300 – 350)
12.3 – 15.7 (125 ~ 160)
Valve core cap
GRN + YEL
2 Installation Of Remote Controller
The remote controller can be placed in its holder which is
G
fixed on wall or beam.
G 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.
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.
Remote
Controller
Operation Test
Please ensure that the air conditioner is in normal
G
operating condition during the operation test.
G Explain to your customer the proper operation
procedures as described in the user's manual.
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 the
"Lo" shuttle. Run the vacuum pump for about 10–15 minutes, then completely
2
tighten the "Lo" shuttle and switch off the vacuum pump.
Completely unscrew the spindle of the service valve (at 2 places) in anti-clockwise
3
direction to allow the flow of coolant (using Hexagonal Wrench key).
Torque N·m
(kgf · cm) Remove the charge hose and tighten the cap of valve head. Check the cap's
4
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. (Use the detector provided for
R410A).

Wiring Of The Indoor Unit

G For wire connection of the Indoor unit, you need to remove front panel and electrical cover.
Method to remove front panel
G Refer to "FINAL STAGE OF INSTALLATION – How to Remove The Front Cover".
Method to remove the low cover
1 2
Pull the cover at and in the directions as shown by arrows to remove the cover.
G
Checking for the electric source and the voltage range
G 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
How to Remove The Front Cover
1 Remove the front panel.
Please remove and attach the front panel by both hands.
G
After opening the front panel by both hands.
G
1 1 1 1 1
Undo the right arm while pushing it inside.
2 2 2 2 2
Slide the front panel to right as shown in figure. Then
remove while pulling it to front.
Screw (2 pieces)
2 Remove the filters.
3 After removing two screws, pull the center of the front
cover towards you and release the claws.
Holder for
Remote Controller
4 Pull the side faces (lower sections) of the front cover
towards you as shown in the figure and remove the
cover.
Stop valve
D
C
After remove the screw
and cover, and put the
connecting cords and fix
the cover with screw.
Cable length Wire cross-section
2
up to 16m 1.5mm
2
up to 15m 2.5mm
2
up to 25m 4.0mm
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.
When the meter reaches -101KPa (-76cmHg) during
pumping, fully tighten the shuttle.
Meter showing pressure
Closed
Lo Hi
R410A Manifold valve
Charge hose
Vacuum pump
Stop
valve
Vacuum pump adapter
When pumping starts,
slightly loosen the flare
nut to check of air
sucked in. Then tighten
the flare nut.
The body of
service valve
Cap of
valve core
Hexagonal
Wrench Key
Cap of valve head
Cap of valve head
Connect the
earth cord
Shaft
Hole Step