Hitachi RAI-25NH5A Installation Manual

FOR SERVICE PERSONNEL ONLY
HITACHI CEILING CASSETTE-UNIT AIR
CONDITIONER INSTALLATION MANUAL
RAI-25NH5A
Indoor Unit HFC
RAI-35NH5A
R410A
RAI-50NH5A

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.
!
●
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 specified wire for the connection 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 R-410A. Otherwise, this may result in broken copper pipes or faults.
●
When installing or removing an air conditioner, only specified refrigerant (R410A) shall be allowed, 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.
!
●
A circuit breaker or fuse (16A time delay) 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 3.5mm has to be installed in the power supply line to the outdoor unit.
●
Piping shall be suitable supported with a maximum spacing of 1m between the supports.
●
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.
●
For installation of front panel RAI-ECPM, please follow exactly the instruction in the manual.
●
Please ensure smooth flow of water when installing the drain hose.
1 Opening on ceiling and suspension bolt
650 (Panel)
600 (Opening on ceiling)
64
580 (Indoor unit)
400 (Suspension bolt)
Narrow pipe Ø6.35
Panel (Optional part RAI-ECPM)
Ceiling
● Need a connecting work for refrigerant pipe, drain pipe and F cable in the ceiling after
suspending the indoor unit. Arrange drain pipe, refrigerant pipe and F cable in their installation
position.
● For finishing of opening on ceiling, arrange with builder in detail.
If ceiling is already completed, connecting cables between indoor and outdoor, piping and
●
drain piping must be done before fitting indoor unit.
2

Preparation for installing indoor unit

Installation of suspension bolts

● Be sure to reinforce furring of ceiling (frame : ceiling joints and supporter) to maintain level
of ceiling and prevent vibration of ceiling plate.
● Suspension bolts should be purchased in the field.
● Refer to diagrams shown below for length of suspension bolts.
● In case of wooden frame ● In case of steel frame
Insert 980 ~ 1470N
60 ~ 90mm square piece of lumber
150 ~ 160mm
(100 ~ 150kgf)
Reinforcing
bar
Suspension bolt (M10)
Nut
Angle
Angle
Nut
Angle
Suspension
bolt (M10)
Ceiling
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 Outdoor
Seal with putty
2 ~ 5mm
Seal with
putty
Protection
pipe
Sleeve of
protection
pipe
WALL

Drain pipe installation

● Use PVC pipe VP20 (O.D. 26mm) for drain pipe.
● Be sure to roll an insulation (thickness 10mm or more) for the drain pipe at indoor side.
● Always draw the drain pipe downward so that water flows smoothly. Fix it (ex. by hanger)
to prevent a peak and trap.
Downward 1/25 ~ 1/100
Seal
Ditch
Insulation (Thickness
10mm or more)
< >
IA370: A
●
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
● ●
ø 65mm Power Drill Hexagonal Wrench Key (
● ●
Wrench (14, 17, 19, 22, 26, 27mm) Gas Leakage Detector
● ● ●
Pipe Cutter Vinyl Tape Pliers
WARNING
CAUTION
● In case drain piping cannot be done smoothly due to obstacles, it can also be arranged
outside of the main unit as shown in the drawing below.
(Unit : mm)
Use PVC pipe VP20
3

Installation of indoor unit

● Set nut and washer on suspension bolt and hook it to suspension clamp by lifting the indoor
97 (Drain)
unit.
65
42 Drain outlet
● Suspension bolt must have play of 20-30 mm on its right and left. If cannot have enough
Wide pipe Ø12.7
play, fix lifting lug to suspension bolt without attaching nut underneath the suspension bolt,
then attach nut and install indoor unit.
● Make sure that indoor unit is kept level using a level.
Air outlet Air inlet Air outlet
The space between bottom surfaces of ceiling and indoor unit
● Be sure to install the indoor units as follow position (1).
● Do not install the indoor units as follows position (2) (3).
(Unit : mm)
(1) Same level (draw in 0~2mm)
Bend slip-
● Be sure that bottom face
preventive metal
of indoor main unit is the
C type
same height (or expected
metal
Concrete
height if the ceiling is new
Long nut
construction.) as lower
Suspension
surface of the ceiling.
bolt (M10)
Hanger bolt
If constructing the ceiling after installation
●
of air conditioner, be sure to attach a
pattern paper for installation that shows
ceiling opening dimension.
H beam
Suspension
Suspension Pattern paper for
bolt (M10)
installation plate
bolt (M10)
Ceiling
610mm (Suspension bolt)
PATTERN PAPER FOR INSTALLATION
! CAUTION
Be sure that the wire is not
Marking hole for
opening on ceiling
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 580mm (Indoor unit shape)
damaged by mouse.
600mm (Opening on ceiling)
! WARNING
NOTE
Please using this pattern paper, decide the suspension
Be sure to use protection pipe
bolt. Position by putting this reverse side on ceiling surface.
(commercial product).
If connecting cables are touching
Drawing of bottom view of ceiling
metal lath inside the wall or inside
the wall is hollow where mouse

Selecting the Mounting Position

can bite cables, it can cause
The installation place is very important for the air conditioner because it is very difficult to
electrical shock or fire.
move from one place to another after the first installation.
If sealing is not complete, high
Decide the mounting position together with the customer.
humid air from inside the wall or
The discharge direction can be selected as shown below.
outside of the room can come in
and cause water dripping.
Pipe
4 Directions
Since 2-way outlet as shown below causes performance problems, do not set it.
Trap
No insulation
Stagnant
water

THE CHOICE OF MOUNTING SITE

●
The unit should be mounted at stable, non-vibratory location which can provide full support to the unit.
●
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.
●
● ●
Knife Saw 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.
4mm)
●
The installation height of indoor unit must be 2.3m or more.
●
Flare Tool

Names of Indoor Components

No. Item
Insulation pipe for flare section
1
Binder
2
Holder for Remote Controller
3
AAA Size Battery
4
Screw for holder of Remote
Controller
5
(3.1x16)
Insulation pipe for drain pipe
6
Insulation pipe
7
Remote Controller
8
Pattern paper for positioning
plate
11
Pattern paper for installation
plate
12
Installation plate fixing screw
13
(M5 X 16)
Blower cover
14
Corner Seal
16
150mm or less
Downward pitch 1/25 ~ 1/100
Insulation (Thickness 10mm or more)
VP20
VP20
Suspension bolt (M10)
(Local purchase)
Hexagon nut (M10)
(Local purchase)
Washer (Local
purchase)
Drawing of
bottom view of
ceiling
Pattern paper for positioning plate 11
Indoor unit
(2) Stick out above 0mm (3) Draw in above 3mm
! CAUTION
● Be sure to install the indoor unit level. If the indoor unit is
inclined, water may leak.
● If space between bottom surfaces of indoor unit and ceiling
is not correct, there may be a gap between the panel and
indoor unit, with consequence dropping of condensed water.

Selecting the switch

Turn power off.
1
Remove cover of the electrical box.
2
When install the indoor unit 2500mm
3
or more from the floor, select the
"STATIC PRESSURE SW" on the main
Installation plate
12
13
fixing screw PWB to HIGH PRESSURE.
When install the indoor unit below than
2500mm from the floor, select the
"STATIC PRESSURE SW" on the main
PWB to NORMAL.
Center of
indoor unit
Fixing hole
for panel
Pipes
Drain Pipe
STATIC PRESSURE SW
HIGH PRESSURE
This is used for increasing fan speed
according to the situation of the trial
NORMAL
operation inside the room with ceiling
height of 2.5m and above.
However noise gets slightly higher.
600mm or more 600mm or more 600mm or more
3 Directions 3 Directions 2 Directions
! CAUTION
Pipe Pipe
(Please note the following matters and obtain permission from customer before installation).
! WARNING
CAUTION
!
Qty
2
Air inlet
Air Air
outlet outlet
1000 mm 1000 mm
4
or more or more
1
2
Air inlet
Air Air
outlet outlet
1000 mm 1000 mm
or more or more
2
1
Be sure to
completely
1
seal any
gap with
putty.
1
1
1
4
RAI-50NH5A
2
No. Item Qty
Insulator
3
17 1
Blower cover installation
Install the blower cover only to the air outlet direction which is not in use.
Install the blower cover at the diffuser position shown. Fix the blower cover certainly.
Corner seal installation
Install the corner seal at position shown. Fix the corner seal certainly. Shall be installed
disregard to 2 directions, 3 directions or 4 directions.
2 direction example
Corner seal 16
A
Corner seal 16
A
Selecting the switch
Turn power off.
1
Remove cover of the electrical box.
2
When selecting discharge direction of 2 directions or 3 directions, select
3
the "AIR FLOW SELECTION" on the main PWB to 3 way.
When selecting discharge direction of 4 directions, select the "AIR FLOW
SELECTION" on the switch PWB to NORMAL.
NOTE:
During 2 directions or 3 directions, sound level will increase.
Connecting the pipe
4

Connecting the pipe to the indoor unit

Remove the flare nut and seal cap.
By loosening the flare nut at the pipe end, the refrigerant is discharged in a small amount.
The arrangement has been made for shipment, and the discharge of refrigerant is never a
trouble to the equipment.
When the flare nut is removed, never fail to remove the seal cap. If not removed, the refrigerant
will not be circulated, which result the compressor drive motor will possibly be burnt.
Apply refrigerator oil to the union and the flared portion of the pipe.
Wrap flare insulation, bind top and bottom flare insulation by binder.
When connecting pipes, if flare nut is over-tightened at the small diameter side, the screw
thread of the service valve may be broken making pipe connection impossible. Be sure to
tighten the nut with specified torque.
Flare nut
Union
Wrench
Torque
wrench
Wrapping
To be
Insulation pipe for
adhesion
flare section
Refrigerating pipes with insulation
Indoor unit
(purchased in the field)
Binder
2
Insulation at indoor unit

Connecting of drain pipe

● Securely glue connection part of drain
hose and PVC pipe, using PVC
adhesive.
● If gluing of drain hose and PVC pipe
is too weak, water leakage may occur.
Be sure to wrap generally-available
insulator (10mm or more of foamed
polyethylene) around drain hose,
inside the house, for insulation heat.
● Checking drain and water leakage.
Perform after connecting power.
● If checking of drainage is omitted,
water drop may occur.
1000mm or more
Add water to water pan of indoor unit
●
as shown below.
● Perform test running of drain pump to
check drainage operation.
● Test run method
Turn power on.
1
Remove cover of electric box and
2
set the drain pump test run switch
2 Directions
to TEST.
After checking the drainage, return
3
the switch to NORMAL.
! CAUTION
● If drain pump test run is right set
to TEST, drain pump may
malfunction.
Figure showing the Installation of Indoor Unit.
CAUTION
!
•
The installation height of indoor unit
must be 2.3m or more.
The indoor piping
should be insulated
with the enclosed
insulation pipe. (If the
insulator is insufficient,
please use commersial
products).
4
5 ●
The difference in height
between the indoor and
3
outdoor unit should be kept
below 10m.
●
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).
Drain Pipe
Must be installed separately.
Insulate indoor part of pipe to
prevent condensation.
Fit the blower cover.
Blower cover 14
Corner seal 16
Blower cover
A-A Section view
3WAY
NORMAL
AIR FLOW
SELECTION
! CAUTION
! CAUTION
● The rubber strap used for fixing the insulator
should not be tied with great force. Otherwise,
this will damage heat insulation and causes
water condensation.
1 Pipe Rubber strap tied with great force
Indoor unit
Insulation pipe
To be adhesion
(10mm or more of
encroach (2 ~ 4mm)
PVC adhesive
foamed polyethylene)
(purchased in the field)
PVC pipe
(purchased in the field)
Insulation pipe
for drain pipe 6
Evaporator
Air outlet
Water pan
Pitcher
(add water)
TEST
NORMAL
DRAIN PUMP
TEST SW