Hitachi RAS-35YH6 How to remove the front cover, How to Attach the Front Cover, Unit, Removal

Tighten the two screws.

•Please mount the Outdoor unit of stable ground to prevent vibration and increase of noise level.

•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. Reinstall the side cover in the reverse order of the removal.

REMOVAL

1Preparation of Pipe

•Use a pipe cutter to cut the copper pipe and remove burr.

Trimming tool

3Remove of Air From The Pipe And Gas Leakage Inspection

Procedures of using Vacuum Pump for Air Removal

When the meter reaches - 101KPa

As shown in right figure, remove the cap (-76cmHg) during pumping fully

UNIT

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

CAUTION

•Do not touch the suction port, bottom surface, or aluminum fin of the outdoor unit.

Failure to do so may cause an injury.

PIPES AND AIR

Copper pipe

CAUTION

•Remove burr and 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 for
		Copper piperefrigerant R410.
Outer	A (mm) Rigid Flaring Tool
Diameter (Ø)	For R410A tool	For R22 tool

	1	of valve core. Then, connect the charge	tighten the shuttle.
		hose. Remove the cap of valve head.	Meter showing
		Connect the vacuum pump adapter to the
			pressure
		vacuum pump and connect the charge
				Closed
		hose to the adapter.	Charge	R410A
			hose	Manifold
				valveVacuum
REMOVAL
		Fully tighter the "Hi" shuttle of the manifold	Valve	pump
		valve and completely unscrew the "Lo"
		shuttle. Run the vacuum pump for about		Vacuum
		10-15 minutes, then completely tighten the
				pump
		"Lo" shuttle and switch off the vacuum
	2		Valve	adapter
		pump.
			When pumping starts, slightly
		• Loosen the spindle of the service valve	loosen the flare nut to check of
		with small diameter by 1/4 turn and	air sucked in. Then tighten the
		tighten the spindle immediately after 5	flare nut.
			The body of service
AIR		to 6 seconds.
		• Remove the charging hose from the	valve

OUTDOOR

CONDENSED WATER DISPOSAL OF OUTDOOR UNIT

•There is 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.

•Cover the drain hole with a bush. To install the bush, put it on the drain hole as shown in the figure and press the both sides of the bush to fit into the hole. After installation, check whether the drain pipe and bush cling to the base firmly.

		BASE
	DRAIN HOLE	above
		100mm
Push	Push 9 BUSH	9 BUSH
		DRAIN HOLE
		0 DRAIN PIPE

Outer diameter: 16 mm or more

•Install the outdoor unit horizontally and make sure that condensate drains away.

•In case of using in chilly area

Especially, in case that there are many snows by very cold in chilly area, condensed water freezes on the base and may result not to drain. In this case, please remove the bush and the drain pipe at the bottom of unit. (Left and center near discharge portion of air, each 1 place). It becomes smooth drain.

Ensure that the distance from the drain hole to the ground is 250 mm or more.

INSTALLATION OF REFRIGERATING

6.35 (1/4")	0 - 0.5	1.0
9.52 (3/8")	0 - 0.5	1.0

2 Pipe Connection

•In case of removing flare nut of a indoor unit, first remove a nut of small diameter side, or a seal cap of big diameter side will fly out. Free from water into the piping when

CAUTION	working.
	• Be sure to tighten the flare nut to the specified torque with
	a torque wrench.
	If the flare nut is overtightened, the nut may be split after a
	long period has passed, and may cause a refrigerant leak.

•Please be careful when bending the copper pipe.

•Screw in manually while adjusting the center. After that, use a torque wrench to tighten the connection.

	Flare nut		Outer diameter	Torque N·m
			of pipe (ø)	(kgf·cm)
	Small diameter side		6.35 (1/4")	13.7 – 18.6 (140 – 190)
	Large diameter side		9.52 (3/8")	34.3 – 44.1 (350 – 450)
Wrench	Valve	Small diameter side	6.35 (1/4")	19.6 – 24.5 (200 – 250)
	Torque head cap	Large diameter side	9.52 (3/8")	19.6 – 24.5 (200 – 250)
	wrench	Valve core cap		12.3– 15.7 (125 – 160)

	service valve.
	Completely unscrew the spindle of the	Cap of
3	service valve (at 2 places) in anticlockwise	valve core
	direction to allow the flow of refrigerant
			Cap of valve
	(using Hexagonal Wrench key).
		Hexagonal	head
		wrench Key
4	Tighten the cap of valve head. Check the
	cap's periphery if there is any gas leakage.		Cap of valve
	The task is then completed.		head

Gas leakage inspection

Please use gas leakage detector to check if leakage occurs at connection of Flare nut as shown on the right.

If gas leakage occurs, further tighten the connection to stop leakage.

CORD

WARNING	• THIS APPLIANCE MUST BE
	EARTHED.
Procedures of Wiring
When power supplies to Indoor Unit		Detail of cutting the connecting cord
Indoor Unit		Indoor Unit
	Outdoor Unit	Green + Yellow	30mm	30mm
Line cord			10mm	10mm
		10mm		Strip wires
	ø2.0	70mm
		Outdoor Unit
	Connecting Cord		30mm	30mm
		10mm		10mm
	ø1.6 or ø2.0
		Green + Yellow		Strip wires

Wiring of The Indoor Unit

•For wire connection of the Indoor unit, you need to remove the front cover, the low cover under the body of the unit and terminal cover.

When power supplied to outdoor unit

•Power cannot be turned off using power switch.

Always keep the switch "off" and put the switch cover on the power switch so that the power cannot be turned on.

•Power cord is not necessary, store it in the lower-side space on the rear side of indoor unit. When storing, warp the power plug with the vinyl bag for the parts, etc. and seal with adhesive tape to prevent dust or dirt.

•Terminal A and B of indoor unit do not need to be connected.

•When power supplied to outdoor unit, power is not turned off by switching the power of indoor unit to "off". In that case, please cut the breaker.

•Remove the cover from the terminal base and screw the cable.

Method to remove the low cover

•Pull at the ¡ and ™ in the directions as shown by arrows to remove the cover.

Wiring of the Outdoor Unit

•Please remove the side cover for wire connection.

CONNECTION OF POWER

When power supplies to Outdoor Unit		Detail of cutting the connecting cord
Indoor Unit	Outdoor Unit	Indoor Unit
				30mm
		Green + Yellow
				10mm
ø1.6 or
ø2.0			70mm
		10mm
Connecting Cord		Outdoor Unit
				50mm	50mm
			10mm		10mm
		Green + Yellow			Green + Yellow
					Strip wires

WARNING

•	The naked part of the wire core should be 10mm 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 wire specified for the use of air-conditioner.

Connecting cord DC

Connecting cord BA

	Earth
After remove the screw
and terminal cover, and	Terminal cover
put the connecting cords
and fix the terminal cover	Screw
with screw.

•Wiring for the horizontal piping from the right side.

Securely screw in the power cord and connecting cord so that it will not get loose or disconnect.

Tightening torque reference value:

1.2to 1.6 N·m (12 to 16 kgf·cm) Excessive tightening may damage the interior of the cord requiring replacement.

When putting two connecting cords through the band.

Screw

Insulating plate

Cord band

Connecting cord

WARNING

After wiring the indoor unit, make sure to reattach the terminal cover.

•If you cannot attach the side plate due to the connection cord, please

	press the connecting cord in the direction to the front panel to fix it.
WARNING	• Be sure that the hooks of the side cover 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 gauge list below for the wiring from house distribution fuse box to the outdoor unit in consideration of the blocked rotor current.

IMPORTANT		cover
Wire length	Wire gauge
up to 6m	1.6mm2	Earth terminal
up to 15m	2.5mm2

•	Please refer to the manual for wire connection and the wiring technique should
	meet the standard of the electrical installation.
•	There is an AC voltage drop between the LN terminal if the power is on. Therefore,
	be sure to remove the plug from its socket.

WARNING

• Leave some space in the connecting cord for maintenance purpose and be sure to secure it with the cord band.

• Secure the connecting cord along the coated part of the wire using the cord band. Do not exert pressure on the wire as this may cause overheating or fire.

Not to interfere with the drain hose, fold the cable at the drain hose side of the electric box as shown in the left figure, and pass the cable just over the electric box and pull it out.

Cable

			Piping and drain hose layout
		Pipe	Cable
		Drain	Pipe
Power	Electric box	hose
			Drain
cord	Form the cable properly so that the
	low cover won’ t touch the cable in		Power cord
	installation.

up to 20m 4.0mm2

• Investigate the power supply capacity and other	IMPORTANT
electrical conditions at the installing location.
Depending on the model of room air conditioner to be		Fuse Capacity
installed, request the customer to make arrangements
		16A time delay fuse
for the necessary electrical work etc.
The electrical work includes the wiring work up the
outdoor unit. In localities where electrical conditions
are poor, use of a voltage regulation is recommended.
• Install outdoor for the room air conditioner within the
reaching range of the line cord.

1 Power Source And Operation Test

2 Installation of Remote Controller How to remove the front cover How to Attach the Front Cover

	Power Source
INSTALLATION	WARNING
	• Never remodel the power plug nor extend the long-distance
	cord.
	• 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.
	• The power cable easily generates heat. Do not bring the
	cable together with a wire or vinyl tie.

		Operation test
OF	•	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.
STAGE
	•	If the indoor unit won't operate, check the cable for correct
		connection.
	•	Turn on the lamp in the room where the indoor unit is installed
		and check the remote controller for normal operation.

•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.

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)

Holder for Remote

Controller

Remote controller

Force-cooling operation

¡ Remove the front panel	¡ Check that the drain pan is securely attached.
• Please remove and attach the front panel by both hands.	™ 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.

£

• After opening the front panel by both hands.
1 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.
™ Remove the filters.	¢ Install the filter.
£ After removing two screws, pull the center of the front cover
	∞ Slide the shafts of the right and left arms on the front panel
towards you and release the claws.
¢ Pull the side faces (lower sections) of the front cover towards	along the steps to insert the shafts into the holes till they stop.
	After checking that the shafts are securely inserted, close the
you as shown in the figure and remove the cover.	panel.
	Shaft

FINAL	After completing the service switch
	operation, be sure to keep the
	switch pressed for one or more
	seconds and stop the force-cooling
	operation.

< S735 : A >

• When the service switch			Screw
of the indoor		unit is		Hole	Step
pressed for 1 or more Cover
seconds,	the	force-
cooling operation starts.
Use this mode when			Service switch (If the switch is	HOW TO REMOVE INDOOR UNIT
performing the failure
			pressed for one or more seconds, the
diagnosis or collecting
			force-cooling operation starts. If the	• Push up the [PUSH] sections at the bottom of the indoor unit and
refrigerant	into the
			switch is pressed for additional one or	pull the bottom plate towards you. Then the claws are released
outdoor unit.
			more seconds, the operation stops.)	from the stationary plate.
CAUTION		• Do not operate the unit for more than 5 minutes		(The [PUSH] sections are indicated by 2 arrows in the right figure)
		while the spindle of the service valve is closed.		[PUSH] mark positions

06K108_RAS-35_YH6_English.p65 2 11/9/06, 10:58 AM