Hitachi RAS-14KH2 Outdoor Unit, Refrigerating Pipes and AIR Removal, Power Cord, Connection

● Please mount the Outdoor unit on stable ground to prevent vibration

and increase of noise level.

1 Preparation of Pipe

3 Removal Of Air From The Pipe And Gas Leakage Inspection

OUTDOOR UNIT

● Decide the location for piping after sorting out the different types of

pipe available.

● When removing side cover, please pull the handle after undoing the

hook by pulling it downward.

Please face this side (suction side) of the unit to the wall.

Please remove side cover when connecting the piping and connecting cord.

Pull downward

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	ABOVE
BASE
	100 mm
DRAIN PIPE
	11 BUSH

OF REFRIGERATING PIPES AND AIR REMOVAL

● Use a pipe cutter to cut the copper pipe.

Trimming tool

Copper pipe

!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
Outer	A (mm)
Diameter (mm)	For R410A tool	For R22 tool
6.35	0.0 ~ 0.5mm	1.0mm
9.52	0.0 ~ 0.5mm	1.0mm

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

AIR REMOVAL

Procedures of using Vacuum Pump for Air Removal

As shown in right figure, remove the cap of valve core. Then, connect the charge

1hose. 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

2the “Lo” shuttle. Run the vacuum pump for about 10–15 minutes, then completely tighten the “Lo” shuttle and switch off the vacuum pump.

Completely unscrew the spindle of the

3service valve (at 2 places) in anti- clockwise direction to allow the flow of coolant (using Hexagonal Wrench key).

Remove the charge hose and tighten the cap of valve head. Check the cap’s

4periphery if there is any gas leakage. The task is then completed.

When the meter reaches - 101KPa (-76cmHg) during pumping, fully tighten the shuttle.

Meter showing pressure

		Closed
Lo	Hi	R410A
Charge hose		Manifold valve
Valve		Vacuum
Valve		pump

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

9 BUSH

10 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.

INSTALLATION

tighten the connection.

				Outer			Torque N·m
	Flare nut			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)
Wrench	Torque	Valve	Small dia. side	6.35	(1/4")	19.6	– 24.5	(200	~ 250)
	wrench	head cap	Large dia. side	9.52	(3/8")	19.6	– 24.5	(200	~ 250)
		Valve core cap				12.3	– 15.7	(125	~ 160)

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.

POWER CORD

!WARNING ● THIS APPLIANCE MUST BE EARTHED.

Procedures of Wiring

In case that power is supplied from Indoor Unit

Line Cord

Indoor Unit

Outdoor Unit

L

N

A

B

C

D

A

B

C

D

AC 220-240V

2.0

Connecting Cord

1.6 or 2.0

Power line

Control line

30mm

30mm

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 1and 2in the directions as shown by arrows to remove the cover.

Wiring of The Outdoor Unit

After remove the screw and cover, and put the connecting cords and fix the cover with screw.

CONNECTION OF

						10mm			10mm
	Indoor
	Unit
				10mm			GRN + YEL
					70mm
							Strip wires
						25mm
							25mm
Outdoor			10mm					10mm
		Unit

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.

●Please remove the side cover for wire connection.

●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 WARNING 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.

A B C D

Earth terminal

●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.

● Be sure to use only power cables approved from the authorities in your country. For example in Germany:

Cable type: NYM 3x1.5mm2.

● 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.

IMPORTANT

Cable length	Wire cross-section	IMPORTANT
up to 16m	1.6mm2
up to 15m	2.5mm2		Fuse Capacity
up to 25m	4.0mm2		15A time delay fuse

FINAL STAGE OF INSTALLATION

1Insulation And Maintenance Of Pipe Connection 2 Installation Of Remote Controller

● The connected terminals should be completely sealed with

● The remote controller can be placed in its holder which is

heat insulator and then tied up with rubber strap.

fixed on wall or beam.

●

Please tie the pipe and power line together with vinyl tape as

● To operate the remote controller at its holder, please ensure

shown in the figure showing the installation of Indoor and

that the unit can receive signal transmitted from the controller

Outdoor units. Then fix their position with holders.

at the place where the holder is to be fixed. The unit will beep

● To enchance the heat insulation and to prevent water

when signal is received from the remote controller. The signal

condensation, please cover the outdoor part of the drain hose

transmission is weaken by the fluorescent light. Therefore,

and pipe with insulation pipe.

during the installation of the remote control holder, please

● Completely seal any gap with putty.

switch on the light, even during day time, to determine the

Insulation material for pipe connection

mounting location of the holder.

The controller must

Sleeve of

be hooked onto the

hook

at

the lower

protection pipe

Screw (2 pieces)

part

of

the

holder.

Putty

Push in the remote

controller

in

the

direction as

shown

Holder for

in figure below.

Remote Controller

Putty

Remote

Controller

3

Power Source And Operation Test

Power Source

Operation Test

! CAUTION

●

Please ensure that the air conditioner is in normal

operating condition during the operation test.

● Please use a new socket. Accident may occur due to the use of old

● Explain to your customer the proper operation

socket because of poor contact.

procedures as described in the user’s manual.

●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.

How to Remove The Front Cover

1Remove the front panel.

●Please remove and attach the front panel by both hands.

1● After opening the front panel by both hands.

2Undo the right arm while pushing it inside.

Slide the front panel to right as shown in figure. Then remove while pulling it to front.

2Remove the filters.

3After removing two screws, pull the center of the front cover towards you and release the claws.

4Pull 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

1Check that the drain pan is securely attached.

2After 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.

3Tighten the two screws.

4Install the filter.

5Slide 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

HoleStep

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