Hitachi RAC-35NH5 Installation Manual page 2

1 Preparation of Pipe
Use a pipe cutter to cut the copper pipe.
G
Copper pipe
CAUTION
!
Jagged edge will cause leakage.
G
G 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.
G
Die
Die
Copper pipe
Outer
Diameter (mm)
For R410A tool
~
6.35 0.0 0.5mm
0.0 ~ 0.5mm
9.52
12.7 0.0 ~ 0.5mm
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 Outdoor Unit
Indoor Unit
C D
1.6 or
2.0
Connecting Cord
Strip wires
25mm
25mm
10mm
Outdoor
10mm
Unit
10mm
GRN + YEL
35mm
Power line
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.
G Be sure to use only power cables approved from the authorities in your country.
For example in Germany: Cable type: NYM 3x1.5mm
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.
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I867: A
(EN) INS RAC-25/35/50NH5 2
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
Trimming tool out. Prevent water from entering into the piping when working.
Flare nut
Wrench Torque
wrench
A
G Recommend to use
R410A flaring tool.
Gas Leakage Inspection
A (mm)
Please use gas leakage detector to check if
leakage occurs at the connection of Flare
For R22 tool
nut as shown on the right.
1.0mm
1.0mm
If gas leakage occurs, further tighten the
connection to stop leakage. (Use the detector
1.0mm
provided for R410A)
Wiring of The Outdoor Unit
Please remove the side cover for wire connection.
G
G
!
G
WARNING
Outdoor Unit
G
L N C D
Checking for the electric source and the
voltage range
Connecting Cord
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
2.0
of fuse box to the main switch and outdoor unit in consideration of the locked rotor
AC 220 - 230V
current.
IMPORTANT
Cable length
up to 16m
up to 15m
Control line
up to 25m
G 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
2 .
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.
Outer Torque N·m
dia.of pipe (kgf · cm)
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)
6.35 (1/4") 19.6 – 24.5 (200 ~ 250)
Valve Small dia. side
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
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.)
Wire cross-section
2
1.5mm
2
2.5mm
2
4.0mm
Use 16A Time
N C D
L
Delay Fuse
Earth terminal
20/10/05, 9:14 AM
3 Removal Of Air From The Pipe And Gas Leakage Inspection
Procedures of using Vacuum Pump for Air Removal
When the meter reaches - 101KPa
(-76cmHg) during pumping, fully
tighten the shuttle.
As shown in right figure, remove the cap
of valve core. Then, connect the charge
hose. Remove the cap of valve head.
1
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
2
for about 10–15 minutes, then completely
tighten the "Lo" shuttle and switch off
When pumping starts, slightly loosen the
the vacuum pump. flare nut to check of air sucked in. Then
tighten the flare nut.
Completely unscrew the spindle of the
service valve (at 2 places) in anti-
3
clockwise direction to allow the flow of
coolant (using Hexagonal Wrench key).
Remove the charge hose and tighten the
Cap of valve head
cap of valve head. Check the cap's
4
periphery if there is any gas leakage.
The task is then completed.
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.
G To enchance the heat insulation and to prevent water condensation, please
cover the outdoor part of the drain hose and pipe with insulation pipe.
G Completely seal any gap with putty.
Sleeve of
protection pipe
Insulation material for pipe connection
2 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.
G 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.
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.
Operation Test
G Please ensure that the air conditioner is in normal operating condition during
the operation test.
G Explain to your customer the proper operation procedures as described in the
user's manual.
Meter showing pressure
Closed
R410A
Lo Hi
Manifold valve
Charge hose
Valve
Vacuum
Valve
pump
Vacuum pump
adapter
The body of
service valve
Cap of
valve core
Hexagonal
Wrench Key
Cap of valve head
Putty
Putty