Hitachi RAS-34FSN Instruction Manual

Installation
&
Maintenance
Manual
INVERTER-DRIVEN
MULTI-SPLIT SYSTEM
HEAT PUMP
AIR CONDITIONERS
- SET-FREE FSN -
IMPORTANT:
READ AND UNDERSTAND
THIS MANUAL BEFORE
USING THIS HEAT-PUMP
AIR CONDITIONER.
KEEP THIS MANUAL FOR
FUTURE REFERENCE.
SET-FREE
Models:
Outdoor Units;
RAS-34FSN
RAS-36FSN
RAS-38FSN
RAS-40FSN
RAS-42FSN
P5414034

i
IMPORTANT NOTICE
GHITACHI pursues a policy of continuing improvement in design and performance of products. The right is
therefore reserved to vary specifications without notice.
GHITACHI cannot anticipate every possible circumstance that might involve a potential hazard.
GThis heat pump air conditioner is designed for standard air conditioning only. Do not use this heat pump
air conditioner for other purposes such as drying clothes, refrigerating foods or for any other cooling or
heating process.
GThe installer and system specialist shall secure safety against leakage according to local regulations or
standards. The following standards may be applicable, if local regulations are not available.
British Standard, BS4434 or Japan Standard, KHKS0010.
GNo part of this manual may be reproduced without written permission.
GSignal words (DANGER, WARNING and CAUTION) are used to identify levels of hazard seriousness.
Definitions for identifying hazard levels are provided below with their respective signal words.
:Immediate hazards which WILL result in severe personal injury
or death.
: Hazards or unsafe practices which COULD result in severe personal
injury or death.
:Hazards or unsafe practices which COULD result in minor personal injury
or product or property damage.
:Useful information for operation and/or maintenance.
GIt is assumed that this heat pump air conditioner will be operated and serviced by English speaking
people. If this is not the case, the customer should add safety, caution and operating signs in the native
language.
GIf you have any questions, contact your distributor or dealer of HITACHI.
GThis manual gives a common description and information for this heat pump air conditioner which you
operate as well as for other models.
GPerform installation work according to local codes and regulations.
GThis heat pump air conditioner has been designed for the following temperatures. Operate the heat pump
air conditioner within this range.
NOTE
Attention
This system has been designed for only cooling or heating operation.
Do not apply this system to the rooms where individual cooling and heating operation are required at
the same time. If applied, it will result in uncomfortable air conditioning due to big temperature changes
when the operation mode is changed.
This manual should be considered as a permanent part of the air conditioning equipment and should remain
with the air conditioning equipment.
Temperature (
o
C)
Maximum Minimum
Cooling Indoor 32 DB/25 WB 21 DB/15 WB
Operation Outdoor 43 DB -5 DB
Heating Indoor 27 DB 15 DB
Operation Outdoor 15 WB -20 WB
DB: Dry Bulb, WB: Wet Bulb

ii
CHECKING PRODUCT RECEIVED
GUpon receiving this product, inspect it for any shipping damage.
Claims for damage, either apparent or concealed, should be filed immediately with the shipping
company.
GCheck the model number, electrical characteristics (power supply, voltage and frequency) and
accessories to determine if they are correct.
The standard utilization of the unit shall be explained in these instructions.
Therefore, the utilization of the unit other than those indicated in these instructions is not recommended.
Please contact your local agent, as the occasion arises.
HITACHI’s liability shall not cover defects arising from the alteration performed by a customer without
HITACHI’s consent in a written form.

iii
TABLE OF CONTENTS
1. Safety Summary....................................................................................................................... 1
2. Structure................................................................................................................................... 2
2.1 Outdoor Unit & Refrigerant Cycle .................................................................................... 2
2.2 Necessary Tools and Instrument List for Installation ....................................................... 2
3. Transportation and Handling .................................................................................................... 3
3.1 Combination of Indoor Unit and Outdoor Unit ................................................................. 3
3.2 Transportation ................................................................................................................. 3
3.3 Handling of Outdoor Unit ................................................................................................. 3
4. Outdoor Unit Installation........................................................................................................... 4
4.1 Factory-Supplied Accessories ......................................................................................... 4
4.2 Initial Check ..................................................................................................................... 4
4.3 Foundation ...................................................................................................................... 5
4.4 Installation Work .............................................................................................................. 5
5. Refrigerant Piping Work ........................................................................................................... 6
5.1 Piping Materials ............................................................................................................... 6
5.2 Piping Connection ........................................................................................................... 8
5.3 Stop Valve ..................................................................................................................... 10
5.4 Additional Refrigerant Charge Calculation .................................................................... 11
5.5 Refrigerant Piping Work ................................................................................................ 12
5.6 Multi-Kit ......................................................................................................................... 14
6. Electrical Wiring ...................................................................................................................... 17
6.1 General Check .............................................................................................................. 17
6.2 Electrical Wiring Connection ......................................................................................... 18
6.2.1 For Outdoor Unit ....................................................................................................... 18
6.2.2 Electrical Wiring Between Indoor Unit and Outdoor Unit .......................................... 18
6.3 Dip Switch Setting of Outdoor Unit ................................................................................ 21
7. Test Run ................................................................................................................................. 26
8. Safety and Control Device Setting.......................................................................................... 31

1
1. Safety Summary
Use refrigerant R410A in the refrigerant cycle. Do not charge oxygen, acetylene
or other flammable and poisonous gases into the refrigerant cycle when performing a
leakage test or an air-tight test. These types of gases are extremely dangerous and
can cause an explosion. It is recommended that compressed air, nitrogen or
refrigerant be used for these types of tests.
Do not pour water into the indoor or outdoor unit. These products are equipped with
electrical parts. If poured, it will cause a serious electrical shock.
Do not touch or adjust safety devices inside the indoor or outdoor units. If these
devices are touched or readjusted, it may cause a serious accident.
Do not open the service cover or access panel for the indoor or outdoor units without
turning OFF the main power supply.
Refrigerant leakage can cause difficulty with breathing due to insufficient air. Turn OFF
the main switch, extinguish any naked flames and contact your service contractor, if
refrigerant leakage occurs.
The installer and system specialist shall secure safety against refrigerant leakage
according to local regulations or standards.
Use an ELB (Electric Leakage Breaker). In the event of a fault, there is danger of an
electric shock or a fire if it is not used.
Do not install the outdoor unit where there is a high level of oil mist, flammable gases,
salty air or harmful gases such as sulphur.
Do not install the indoor unit, outdoor unit, remote control switch and cable within
approximately 3 meters from strong electromagnetic wave radiators such as medical
equipment.
Supply electrical power to the system to energize the oil heater for 12 hours before
start-up after a long shutdown.
Do not step or put any material on the product.
Provide a strong and correct foundation so that;
a. The outdoor unit is not on an incline.
b. Abnormal sound does not occur.
c. The outdoor unit will not fall down due to a strong wind or earthquake.
Do not use any sprays such as insecticide, lacquer, hair spray or other flammable
gases within approximately one (1) meter from the system.
If circuit breaker or fuse is often activated, stop the system and contact your service
contractor.
Do not perform installation work, refrigerant piping work, drain piping and electrical
wiring connection without referring to our installation manual. If the instructions are
not followed, it may result in a water leakage, electric shock or a fire.
Check that the ground wire is securely connected. If the unit is not correctly grounded,
it lead electric shock. Do not connect the ground wiring to gas piping, water piping,
lightning conductor or ground wiring for telephone.
Connect a fuse of specified capacity.
Do not put any foreign material on the unit or inside the unit.
Make sure that the outdoor unit is not covered with snow or ice, before operation.
Before performing any brazing work, check to ensure that there is no flammable
material around.
When using refrigerant be sure to wear leather gloves to prevent cold injuries.
Protect the wires, electrical parts, etc. from rats or other small animals.
If not protected, rats may gnaw at unprotected parts and which may lead to a fire.
Fix the cables securely. External forces on the terminals could lead to a fire.

2
2.2 Necessary Tools and Instrument List for Installation
Use tools and measuring instruments only for the new refrigerant which is directly touch to refrigerant.
No. Tool No. Tool No. Tool No. Tool
1 Handsaw 6 Copper Pipe Bender 11 Spanner 16 Leveller
2Phillips
Screwdriver 7Manual Water Pump 12 Charging Cylinder 17 Clamper for Solder-
less Terminals
3 Vacuum Pump 8 Pipe Cutter 13 Gauge Manifold 18 Hoist
(for Indoor Unit)
4Refrigerant Gas
Hose 9 Brazing Kit 14 Cutter for Wires 19 Ammeter
5 Megohmmeter 10 Hexagon Wrench 15 Gas Leak Detector 20 Voltage Meter
: Interchangeability is available with current R22 : only for Refrigerant R410A (No Interchangeability with R22)
: Prohibited : only for Refrigerant R407C (No Interchangeability with R22)
R410A R407C
Pipe Cutter
Chamfering Reamer  -Cutting Pipe
Removing Burrs
Flaring Tool    *The flaring tools for R407C are applicable to R22. Flaring for Tubes
*If using flaring tube, make dimension of tube
larger for R410A.
*In case of material 1/2H, flaring is not available.
Pipe Bender  *In case of material 1/2H, bending is not available.
Use elbow for bend and braze.
Bending
Expanding Tool  *In case of material 1/2H, expanding of tube is not
available. Use socket for connecting tube.
Expanding Tubes
*For φ12.7, φ15.88, spanner size is up 2mm.

*For φ6.35, φ9.53, φ19.05, spanner size is
the same.
Brazing Tool *Perform correct brazing work. Brazing for Tubes
Nitrogen Gas

*Strict Control against Contamin
(Blow nitrogen during brazing.)
Prevention from
Oxidation during
Brazing
Lubrication Oil
(for Flare Surface)
*Use a synthetic oil which is equivalent to the oil
used in the refrigeration cycle.
Applying Oil to the
Flared Surface
*Synthetic oil absorbs moisture quickly.
*Check refrigerant cylinder color. Refrigerant Charging
Liquid refrigerant charging is required regarding
zeotoropic refrigerant.
Vacuum Pump 
Vacuum Pumping
Adapter for
Vacuum Pump 
Manifold Valve  *No interchangeability is available due to higher
pressures when compared with R22.
Charging Hose

Do not use current ones to the different refrigerant.
If used, mineral oil will flow into the cycle and cause
sludges, resulting in clogging or compressor failure.
Connection diameter is different; R410A: UNF1/2,
R407C: UNF7/16.
Charging Cylinder *Use the weight scale. -
Weight Scale
 -
Measuring
Instrument for
Refrigerant Charging
Refrigerant Gas
Leakage Detector 
*The current gas leakage detector (R22) is not
applicable due to different detecting method.
Gas Leakage Check
: Interchangeability with R407C.
Vacuum Pumping,
Vacuum Holding,
Refrigerant Charging
and Check of
Pressures


Measuring Instrument and Tool
Interchangeability
with R22 Reason of Non-Interchangeability and Attention
(: Strictly Required)
Torque Wrench
Vacuum
Drying
.
Refrigerant
Charge
Refrigerant
Cylinder
The current ones are applicable. However, it is
required to mount a vacuum pump adapter which
can prevent from reverse flow when a vacuum
pump stops, resulting in no reverse oil flow.
Use
Refrigerant
Pipe
Extrusion
Adjustment Gauge -
Connection of
Flare Nut
Dimensional Control
for Extruded Portion
of Tube after Flaring


2. Structure
2.1 Outdoor Unit & Refrigerant Cycle
Regarding structure drawings and refrigerant cycle diagram, please refer to Technical Catalogue II.
The pressure of refrigerant R410A is 1.4 times higher than that of conventional refrigerant,
impurities such as moisture, oxide film, and grease affect easily R410A. Therefore, if the specified
materials are not used, it may cause explosion, injury, leakage, electrical shock or fire.

3
Do not hang the unit by the ropes at the
wooden base.
3. Transportation and Handling
3.1 Combination of Indoor Unit and
Outdoor Unit
•Various Indoor/Outdoor Unit Combinations
The following indoor units can be combined
with the HITACHI SET-FREE FSN outdoor unit.
Table 3.1 Indoor Unit Type List
3.2 Transportation
Transport the product as close to the installation
location as practical before unpacking.
•A maximum total capacity of 130% and a
minimum total capacity of 50% can be obtained
by combination of the indoor units when
compared with the nominal outdoor unit
capacity.
Table 3.2 System Combination
Do not step or put any material on the product.
Apply four lifting wires onto the outdoor unit,
when lifting it by crane.
INCORRECT
Wire Rope
Wooden Base
Nominal Capacity (HP)
0.8 1.0 1.5 2.0 2.5 3.0 3.5 4.0 5.0
In-the-Ceiling
4-Way Cassette
2-Way Cassette
Wall
Floor
Floor Concealed
Ceiling
Indoor Unit Type
•Hanging Method
When hanging the unit, ensure a balance of the
unit, check safety and lift up smoothly.
Minimum
Combina-
tion
Capacity
(HP)
Maximum
Combina-
tion
Capacity
(HP)
Combina-
tion
Quantity
Minimum
Individual
Operation
Capacity
(HP)
RAS-34FSN 17.0 44.2 2 to 32 0.8
RAS-36FSN 18.0 46.8 2 to 32 0.8
RAS-38FSN 19.0 49.4 2 to 32 0.8
RAS-40FSN 20.0 52.0 2 to 32 0.8
RAS-42FSN 21.0 54.6 3 to 32 0.8
Indoor Unit
Outdoor
Unit
Model
(1) Do not remove any packing materials.
(2) Hanging Method
Hang the unit under packing condition with
four (4) wire ropes. Push through the wire
ropes into the hang hole and clamp the
wires by using shackle as shown in
Fig. 3.1.
Wire Rope
more than 1.5m
Lead the wire ropes through
the hanging hole and clamp
the wire ropes by using
shackles.
Apply ropes on
the cushions
more than
15mm thickness.
Wooden Base
Do not apply any force
to this plate.
(Both Sides)
Do not remove
wooden frame
and plastic band.
Fig. 3.1 Hanging Work for Transportation
(3) For Installation
A. Remove the wooden base.
B. Apply four (4) wire ropes and hang the
unit as shown in Fig. 3.2.
In case of transportation after unpacking, protect
the unit with the splints or cloth.
3.3 Handling of Outdoor Unit
NOTE
Fig. 3.2 Hanging Work without Wooden Base
Do not put any foreign material into the
outdoor unit and check to ensure that none
exists in the outdoor unit before the
installation and test run. Otherwise, a fire or
failure, etc. may occur.
Wire Rope
more than 1.5m
Lead the wire ropes through
the hanging hole and clamp
the wire ropes by using
shackles.
Apply ropes on
the cushions
more than
15mm thickness.
Do not apply any force
to this plate.
(Both Sides)
Do not remove
wooden frame
and plastic band.

4
4.2 Initial Check
•Install the outdoor unit with a sufficient space
around the outdoor unit for operation and
maintenance as shown in Fig. 4.1.
Aluminum fins have very sharp edges. Pay
attention to the fins to avoid any injury.
Install the outdoor unit on a roof or in an area
where people except service engineers can not
touch the outdoor unit.
Front
Side
Rear
Side *H
(mm)
Min.
1500
500
500
750 300 1/2H
4. Outdoor Unit Installation
4.1 Factory-Supplied Accessories
Check to ensure that the following accessories
are packed with the outdoor unit.
If any of these accessories are not packed with
the unit, please contact your contractor.
Table 4.1 Factory-Supplied Accessories
NOTE
•When there are obstacles above the unit, the
four (front, rear, right and left) sides of the unit
shall be open in principle.
•Install the outdoor unit in a dry well ventilated
environment.
•Install the outdoor unit where the sound or the
discharge air from the outdoor unit does not
affect neighbors or surrounding ventilation.
The operating sound at the rear or right/left
sides is 3 to 6dB(A) higher than the value in
the catalog at the front side.
•Check to ensure that the foundation is flat,
level and sufficiently strong.
•Do not install the outdoor unit where there is a
high level of oil mist, flammable gases, salty air
or harmful gases such as sulphur.
•Do not install the outdoor unit where the
electromagnetic wave is directly radiated to the
electrical box.
•Install the outdoor unit as far as practical, being
at least 3 meters from the electromagnetic
wave radiator.
•When installing the outdoor unit in snow-
covered areas, mount the field-supplied hoods
on the top of the outdoor unit and the inlet side
of the heat exchanger.
•Install the outdoor unit where it is in the shade
or it will not be exposed to direct sunshine or
direct radiation from high temperature heat
source.
•Do not install the outdoor unit where dust or
other contamination could block the outdoor
heat exchanger.
•Install the outdoor unit in a space with limited
access to general public.
•Do not install the outdoor unit in a space where
a seasonal wind directly blows to the outdoor
heat exchanger or a wind from a building
space directly blows to the outdoor fan.
NOTE
Fig. 4.1 Installation and Service Space
Add the half of dimension H to 300mm for air intake
space of rear side, when the wall of rear side is
higher than 500mm.
•In case of no walls at the front and the rear
side of the unit, the space of 500mm for the
front side and 300mm for the rear side is
required.
•When there are walls around the unit, make
the vent hole on the wall.
Accessory Q'ty Purpose
Compressed Sheet 1
Pipe Flange of
Refrigerant Gas Piping 1
Pipe with Flare Nut of
Refrigerant Liquid Piping
(φ19.05)
1
Connection
for Refrigerant
Liquid Piping
Rubber Bush 4 For Connection Hole of
Operation Wiring
1For Connection Hole of
Power Source Wiring
Screw 3 Spare
Connection
for Refrigerant
Gas Piping

5
(5) When installing the outdoor unit, fix the unit
by anchor bolts. Refer to Fig. 4.3
regarding the location of fixing holes.
4.3 Foundation
•Concrete Foundations
(1) The height of the foundation should be
100 to 300mm higher than the ground
level.
(2) Install a drainage around foundation for
smooth drain.
(3) Install the outdoor unit in the front-rear and
right-left direction horizontally.
Check to ensure that the gradient in four
directions (front, rear, right and left) is
within 10mm.
Right Side
and Left Side Front Side
and Rear Side
Fig. 4.2 Foundations
4.4 Installation Work
(1) Secure the outdoor unit with the anchor
bolts.
IncorrectCorrect
FoundationFoundation
Fig. 4.3 Position of Anchor Bolts
(4) Provide a strong and correct foundation so
that;
a. The outdoor unit is not on an incline.
b. Abnormal sound does not occur.
c. The outdoor unit will not fall down due to
a strong wind or earthquake.
Unit: mm
Outdoor
Unit
Drainage
Mortar Hole
100 x Depth 20
Vibration
Proof Mat
P
more than 100
more than
100
Drainage
(Width 100 x Depth 20)
125
Less than 300
590
17
90
17
90
(760)
(614)
794
17
Details of P
Anchor Bolt
100mm
Anchor Bolt
M12
Washer
Filled Mortar
Nut
Concrete
782 10-38x16
Hole of Anchor Bolt
760
782782
782
(2) When installing the unit on a roof or a
veranda, drain water sometimes turns to
ice on a cold morning. Therefore, avoid
draining into an area where people often
use because it is slippery.
(3) When drain piping is necessary for the
outdoor unit, use the drain kit (DBS-26).
(1) Provide a open space above the unit.
(2) Keep a wall height as shown below.
Front Side: Max. 1,500mm
Rear Side: Max. 500mm
Right and Left Side: No Limit
(3) If the wall height exceeds the above value,
add a h1/2 or h2/2 dimension to the service
space of the front or rear side.
(4) The maximum outdoor unit quantity should
be 2 in one block.
(mm)
Min. 300
Min. 10
Min. 600 to 900 Front Side
Min. 20 Min. 10
Max. 1500
h2
h1
500
Min. (600 to 900)+h2/2
(mm)
Min. 300+h1/2
Wall Height: No Limit

6
5. Refrigerant Piping Work
Use refrigerant R410A in the refrigerant
cycle.
Do not charge oxygen, acetylene or other
flammable and poisonous gases into the
refrigerant cycle when performing a leakage
test or an air-tight test. These types of
gases are extremely dangerous and can
cause an explosion. It is recommended that
compressed air, nitrogen or refrigerant be
used for these types of tests.
Check to ensure that no pressure exists
inside the stop valve before removing the
flange.
NOTE
See the items 5.4, 5.5 and 5.6 before
refrigerant piping work.
For connecting φ31.75 pipe to RAS-34FSN
unit, cut off the section which is used for
connecting with the longer pipe size.
29
116
100
ID 32.0
ID 35.2
5.1 Piping Materials
(1) Prepare locally-supplied copper pipes.
(2) Select the piping size from the Table 5.1
and Table 5.2.
(3) Select clean copper pipes. Make sure
there is no dust and moisture inside of the
pipes. Blow the inside of the pipes with
nitrogen or dry air, to remove any dust or
foreign materials before connecting pipes.
Do not use any tools which produce a lot of
swarf such as a saw or a grinder.
Ensure to connect the piping among the units
in the same refrigerant cycle.
For connecting φ38.1 pipe to RAS-36FSN to
RAS-42FSN unit, use the pipe flange (factory-
supplied).
Factory Supplied Pipe Flange
for RAS-36FSN to RAS-42FSN
Factory Supplied Pipe Flange for RAS-34FSN
167
29
100
ID 38.3

7
Cautions for Refrigerant Pipe Ends
When installing pipe through
the wall, secure a cap at the
end of the pipe.
Correct CorrectIncorrect Incorrect
Correct Incorrect
HoleHole
Attach a cap
or vinyl tape.
Attach a cap
or vinyl tape.
Attach a cap
or vinyl bag with
rubber band.
Do not place the pipe
directly on the ground.
Rain water can
enter.
Table 5.1 Piping Size of Outdoor Unit
Table 5.2 Piping Size of Indoor Unit
•Flaring Dimension
Perform the flaring work as shown below.
•Piping Thickness and Material
Use the pipe as below.
•Joint Selection
If you use 1/2H material, you can not perform
the flaring work. In this case, use a joint
selected from the chart below.
()It is impossible to perform the flaring
work with 1/2H material. In this case,
use an accessory pipe (with a flare).
0.4 ~ 0.8R
φA
φd
90
o
+2
o
45
o
+2
o
B
Flare Nut
(mm)
+0
-0.4
R410A R407C
6.35 9.1 9.0
9.53 13.2 13.0
12.7 16.6 16.2
15.88 19.7 19.4
19.05 ()23.3
Diameter
φd
A
(mm)
R410A R407C
Thickness Material Thickness Material
φ6.35 0.8 O material 0.8 O material
φ9.53 0.8 O material 0.8 O material
φ12.7 0.8 O material 0.8 O material
φ15.88 1.0 O material 1.0 O material
φ19.05 1.0 1/2H material 1.0 O material
φ22.2 1.0 1/2H material 1.15 O material
φ25.4 1.0 1/2H material 1.0 1/2H material
φ28.6 1.0 1/2H material 1.0 1/2H material
φ31.75 1.1 1/2H material 1.1 1/2H material
φ38.1 1.35 1/2H material 1.15 1/2H material
Diameter
<Minimum Thickness of Joint (mm)>
Diameter R410A R407C
φ
6.35 0.5 0.5
φ
9.53 0.6 0.6
φ
12.7 0.7 0.7
φ
15.88 0.8 0.8
φ
19.05 0.8 0.8
φ
22.2 0.9 0.9
φ
25.4 0.95 0.95
φ
28.6 1.0 1.0
φ
31.75 1.1 1.05
φ
38.1 1.35 1.25
<Flare Nut Dimension B (mm)>
Diameter R410A R407C
φ
6.35 17 17
φ
9.53 22 22
φ
12.7 26 24
φ
15.88 29 27
φ
19.05 36 36
Unit: mm (in.)
Outdoor Unit Models Gas Piping Liquid Piping
RAS-34FSN φ31.75 (1-1/4) φ19.05 (3/4)
RAS-36FSN φ38.1 (1-1/2) φ19.05 (3/4)
RAS-38FSN φ38.1 (1-1/2) φ19.05 (3/4)
RAS-40FSN φ38.1 (1-1/2) φ19.05 (3/4)
RAS-42FSN φ38.1 (1-1/2) φ19.05 (3/4)
Unit: mm (in.)
Indoor Unit Models Gas
Piping
Liquid
Piping
RPI-0.8FSN, 1.0FSN, 1.5FSN
RCI-1.0FSN, 1.5FSN
RCD-1.0FSN, 1.5FSN
RPK-0.8FSNSM1, 1.0FSNSM1, 1.5FSNSM1
RPF-1.0FSN(E), 1.5FSN(E)
RPFI-1.0FSN(E), 1.5FSN(E)
RPI-2.0FSN, RCI-2.0FSN, RCD-2.0FSN,
RPK-2.0FSNSM, RPC-2.0FSN
RPI-2.5FSN, 3.0FSN, 4.0FSN, 5.0FSN
RCI-2.5FSN, 3.0FSN, 4.0FSN, 5.0FSN
RCD-2.5FSN, 3.0FSN, 4.0FSN, 5.0FSN
RPK-2.5FSNSM, 3.0FSNSM,
3.5FSNSM, 4.0FSNSM
RPC-2.5FSN, 3.0FSN, 4.0FSN, 5.0FSN
φ15.88
(5/8)
φ9.53
(3/8)
φ12.7
(1/2)
φ6.35
(1/4)
φ15.88
(5/8)
φ6.35
(1/4)

8
•Piping Connection
(1) Confirm that the valve is closed.
(2) Prepare a field-supplied bend pipe for
liquid line. Connect it to the liquid valve by
flare nut through the square hole of bottom
base.
(3) For Gas Piping Connection
Prepare a fild-supplied bend pipe for gas
line. Solder it and the factory-supplied pipe
flange at the outside of the unit.
(4) Remove the flange and the gasket
attached to the unit before shipping, and
attach the new gasket (factory-supplied)
before connecting the pipe flange to the
gas valve.
(5) Solder the bend pipes and field piping.
Bolt (Q'ty: 2)
Flange
Gas Valve
Closing Flange
Compressed
Sheet
Compressed
Sheet
(Accessory)
(Accessory)
Redundant
Fig. 5.3 Piping Connection
Field-Supplied Bend Pipe
Factory-Supplied Pipe Flange
Solder by Bottom Side Up
Pay attention to the followings to run through the
cables under the unit using conduit for piping
and wiring works. (The pipe cover is required to
remove before performing piping and wiring
works.)
1. Attach the pipe cover to avoid entering rats or
other small animals into the unit.
2. Completely seal the conduit inlet with sealing
materials.
3. Make a drain hole at the lowest part of the
conduit.
Cable
Pipe
Pipe Cover Seal Conduit
5.2 Piping Connection
•Position of Connecting Pipes to the Outdoor Unit
Connect the pipes with the liquid line stop valve
and the gas line stop valve of the outdoor unit as
shown in Fig. 5.1.
Fig. 5.1 Refrigerant Piping Connection
Fig. 5.2 Piping Direction
Refrigerant Gas
Piping Connection
(φa with Flange)
Refrigerant Liquid
Piping Connection
(φb with Flare Nut)
171 (Refrigerant Liquid
Piping Connection)
274 (Refrigerant Liquid Piping Connection) 247 (Refrigerant Gas Piping Connection)
159 (Refrigerant Gas
Piping Connection)
138
234
Front Side
Bottom Side
Rear Side
Bottom Base
(mm)
Model a b
RAS-34FSN 31.75 19.05
RAS-36FSN 38.1 19.05
RAS-38FSN 38.1 19.05
RAS-40FSN 38.1 19.05
RAS-42FSN 38.1 19.05
Nut
Foot of
Compressor
Vibration-proof
Rubber
Vibration-proof
Rubber
Shipping Washer
(Yellow-Painted)
After piping and wiring work are
completed, remove two yellow
shipping washers for compressor(s).
Do not remove silver washers.

9
Double Spanner Work Tightening Work for Stop Valve
Do not apply the double
spanner work here.
Refrigerant leakage shall
occur.
•When tightening the flare nut, use two
spanners.
Table. 5.3 Tightening Work of Flare Nut
Check to ensure that no pressure increase is
observed one hour after vacuum pumping
completion.
Required Torque
Pipe Size
φ6.35 (1/4) (2 kg-m)
φ9.53 (3/8) (4 kg-m)
φ12.7 (1/2) (6 kg-m)
φ15.88 (5/8) (8 kg-m)
φ19.05 (3/4) (10 kg-m)
Bolt for Flange
(Factory-Supplied) (5.4 to 7.6 kg-m)53 to 75N-m
100N-m
Tightening Torque
20N-m
40N-m
60N-m
80N-m
•Evacuation and refrigerant charging procedure
should be performed according to the following
instructions and Fig. 5.5.
(1) The stop valve has been closed before
shipment, however, make sure that the
stop valves are closed completely.
(2) Connect the indoor unit and the outdoor
unit with field-supplied refrigerant piping.
Suspend the refrigerant piping at specified
points and prevent the refrigerant piping
from touching weak parts of the building
such as wall, ceiling, etc.
(Abnormal sound may occur due to the
vibration of the piping. Pay special
attention in case of short piping length.)
(3) Connect the gauge manifold using
charging hoses with a vacuum pump or a
nitrogen cylinder to the check joints of the
liquid line and the gas line stop valves.
Perform the air-tight test.
Connect a mani-fold gauge to the check
joints of the liquid and gas stop valves in
the outdoor unit. Do not open the stop
valves. Apply nitrogen gas pressure of
4.15MPa for FSN series.
Completion
of Ref.
Piping
Repairing
of Leakage
Part
Check of
Pressure
Decrease
Applying
Nitrogen
Gas
Pass
Procedure
(5) Connect a mani-fold gauge to the check
joints at the both sides.
Continue vacuum pumping work until the
pressure reaches -756mmHg or lower for
one to two hours.
After vacuum pumping work, stop the
mani-fold valve’s valve, stop the vacuum
pump and leave it for one hour. Check to
ensure that the pressure in the manifold
gauge does not increase.
NOTES:
1. If tools or measuring instruments come
into contact with the refrigerant, ensure
they are tools specified for use with
R410A.
2. If vacuum degree of -756mmHg is not
available, it is considered that there is a
gas leakage. Check for any gas leakage
once again. If no leakage exists,
operate the vacuum pump for one to two
hours.
(6) To charge refrigerant, connect the gauge
manifold using charging hoses with a
refrigerant charging cylinder to the check
joint of the liquid line stop valve.
(7) Fully open the gas line stop valve and
slightly open the liquid line stop valve.
(8) Charge refrigerant by opening the gauge
manifold valve.
(9) Charge the required refrigerant within the
difference range of ±0.5kg by operating the
system in cooling.
(10) Fully open the liquid line stop valve after
completing refrigerant charge.
(11) Continue cooling operation for more than
10 minutes to circulate the refrigerant.
(4) Check for any gas leakage at the flare nut
connections, or brazed parts by gas
leakage tester or by use of a foaming
agent.

10
•Insulate the refrigerant pipes as shown in
Fig. 5.4
5.3 Stop Valve
Operation of the stop valve should be performed
according to the following Table 5.4.
Stop Valve
Insulation
(Field-Supplied)
Refrigerant Piping
(Field-Supplied)
Do not apply an abnormal big force to
the spindle valve at the end of opening
(5.0N-m or smaller).
The back seat construction is not provided.
Do not loosen the stop ring. If the stop ring
is loosened, it is dangerous, since the
spindle will hop out.
At the test run, fully open the spindle.
If not fully opened, the devices will be
damaged.
Table 5.4 Stop Valve
Hexagonal Wrench
To open or close
spindle valve
Ref. Pressure Cap
Refrigerant Piping
O-Ring
(Rubber)
.....Open
.....Close
Spindle Valve
Check Joint
Counterclockwise
Clockwise
Tighten the cap with
a torque below.
(Attach this after work)
Only the charging hose
can be connected.
Tighten the cap with a
torque of 9.8N m
Closed before
shipment.
An excess or a shortage of refrigerant is the
main cause of trouble to the units.
Charge the correct refrigerant quantity as
shown in the item 5.4 and the item 5.5.
Check for refrigerant leakage in detail. If a
large refrigerant leakage occurs, it will
cause difficulty with breathing or harmful
gases would occur if a fire was being used
in the room.
Correct Incorrect
Attach a cap
or vinyl tape.
Do not place the pipe
directly on the ground.
Fig. 5.4 Insulation on Pipes
After connecting the refrigerant piping, seal the
refrigerant pipes by using the field-supplied
insulation material. Insulate the unions and flare-
nuts at the piping connections completely.
Insulate the liquid piping and gas piping
completely to avoid decreasing of performance
and dewing on the surface of the pipe.
Cap the end of the pipe when the pipe is to
be inserted through a hole.
Do not put pipes on the ground directly
without a cap or vinyl tape at the end of the
pipe.
(N

m)
Liquid Gas
44.1 58.8
Hexagonal Wrench Size (mm)
Liquid Valve Gas Valve
10 10

11
5.4 Additional Refrigerant Charge Calculation
2. Charging Work
3. Record of Additional Charge
Record the refrigerant charging quantity in order to facilitate maintenance and servicing activities.
Total refrigerant charge of this system is calculated in the following formula.
1.3 Calculation of Additional Charge (W kg)
1. Calculating Method of Additional Refrigerant Charge (W kg)
Although refrigerant has been charged into this unit, it is required that additional refrigerant be charged according
to piping length.
A. Determine an additional refrigerant quantity according to the following procedure, and charge it into the system.
B. Record the additional refrigerant quantity to facilitate service activities thereafter.
Additional Charge of Refrigerant R410A (FSN Series)
1.1 Additional Refrigerant Charge Calculation for Liquid Piping (W1kg)
1.2 Additional Refrigerant Charge Calculation for Indoor Unit (W2kg)
See Example for Model RAS-42FSN, and fill in the following table.
Example Additional Charge W1Total = 14.45 (kg)
Additional refrigerant charge is 1 kg/unit of 8HP and 10HP indoor unit.
Additional refrigerant charge of less than 8HP indoor units are not needed.
Put weight W1and weight W2calculated in items 1.1 and 1.2 into the following formula.
Total Volume of Additional Charge W = W1+ W2
(Example) W = 14.45 + 0.0 = 14.45 kg
This System W = + = kg
Total Ref. Charge of This System = W + W0
This System = + = kg
(Example) W2= 0 unit x 1.0 kg/unit = 0.0 kg
This System W2= unit x 1.0 kg/unit = kg
Charge refrigerant (R410A) into the system according to the instructions
described in the "Installation Manual".
<Table 1>
RAS-34FSN 28.5
RAS-36FSN 31.0
RAS-38FSN 31.0
RAS-40FSN 32.0
RAS-42FSN 32.0
Outdoor Unit W0Outdoor Unit
Ref. Charge (kg)
(Total Combination unit
of 8HP and 10HP.)
This System Additional Charge W1Total = (kg)
φ9.53x5m
φ19.05x20m
φ19.05x5m
φ9.53x5m
42HP No. 0
2.5HP
φ19.05x5m
φ19.05x5m φ12.7x5m
φ15.88x5m
No. 1
4.0HP
φ9.53x5m
φ9.53x5m
No. 2
5.0HP
No. 3
4.0HP
φ9.53x5m
φ9.53x5m
No. 4
5.0HP
No. 5
2.5HP
φ9.53x5m
φ9.53x5m
No. 6
2.5HP
No. 7
2.5HP
φ6.35x10m
No. 8
2.0HP
NOTE:
W0is outdoor unit ref. charge
before shipment.
Pipe Diameter Total Piping Length Additional Charge (kg)
φ22.2 ..... (0) x 0.390 = 0.00
φ19.05 ... (20 + 5 x 3) x 0.280 = 9.80
φ15.88 ... (5) x 0.190 = 0.95
φ12.7 ..... (5) x 0.120 = 0.60
φ9.53 ..... (5 x 8) x 0.07 = 2.80
φ6.35 ..... (10) x 0.03 = 0.30
Pipe Diameter Total Piping Length Additional Charge (kg)
φ22.2 ..... x 0.390 =
φ19.05 ... x 0.280 =
φ15.88 ... x 0.190 =
φ12.7 ..... x 0.120 =
φ9.53 ..... x 0.07 =
φ6.35 ..... x 0.03 =
kg
kg
Total Ref. Charge of This System
Date of Ref. Charge Work
Year Month Day
Total Additional Charge W
Table 5.5 Additional Refrigerant Charge Calculation

12
5.5 Refrigerant Piping Work
In the case that the selected multi-kit size is bigger than that of the first branch, use the same size as the first
branch.
In the case that the selected pipe size after the first branch is bigger than the pipe size before the first branch,
use the same size as before the branch.
If the pipe length from the O.U. to the first branch is more than 100m, the pipe size must be increased
(refer to *1)).
In this case, the pipe size from the first branch to the second branch should be selected according to the
original pipe size.
Table 5.6 Piping System
H1
H2
Indoor
Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit
L3
L2
L3 L3 L3 L3
L3
L1
Gas/Liquid
(φmm)
Indoor Unit Capacity
0.8 to 1.5HP
2.5 to 5HP
2HP
Pipe Size
*2): In the case that liquid piping length is longer
than 15m, use φ9.53 pipe and reducer
(field-supplied).
15.88/6.35
*2)
12.7/6.35
*2)
15.88/9.53
Max. Length
of Liquid Pipe
15m
15m
30m
Multi-Kit
E-302SN
Outdoor Unit
Capacity
34 to 42HP
< First Branch >
< Multi-kit to Indoor Unit >
Gas/Liquid
(φmm)
36~ 38.1/19.05
26~35.99 31.75/19.05
18~25.99 28.6/15.88 E-242SN
16~17.99 28.6/12.7
12~15.99 25.4/12.7
9~11.99 22.2/9.53 E-102SN
6~8.99 19.05/9.53 E-84HSN
*3)
lower than 6 15.88/9.53 E-108HSN
*3)
Multi-kit Model
Total I. U.
Capacity in HP
< Piping Size and Multi-kit after First Branch >
Ref. Pipe Length: L1 Actual within 150m
Equivalent within 175m
Lift between O. U. is Higher within 50m
I. U. and O. U.: H1 O. U. is Lower within 40m
Lift between Indoor Units: H2 within 15m
Total Actual Length of Liquid Pipes within 300m
Piping Length from
1st Branch to each I. U.: L2
Piping Length from
each Multi-kit to I. U.: L3
Applicable Range
within 40m
within 30m
Item
E-162SN
E-302SN
Number of
Branches
5~10 8 branches E-108HSN
5~8 4 branches E-84HSN
Multi-kit
*3)
Total I. U.
Capacity in HP
Gas/Liquid (φmm)
Outdoor Unit Capacity
31.75/19.05 38.1/22.2
38.1/19.05 38.1/22.2
Equivalent Piping Length < 100m Equivalent Piping Length ≥100m
*1)
< Outdoor Unit to First Branch >
34HP
36 to 42HP

13
1. Maximum Permissible Concentration of HFC GAS R410A
The refrigerant R410A is an incombustible and non-toxic gas.
However, if leakage occurs and gas fills a room, it may cause suffocation. The maximum permissible
concentration of HFC gas, R410A in air is 0.3kg/m3, according to the refrigeration and air conditioning facility
standard (KHK S 0010) by the KHK (High Pressure Gas Protection Association) Japan. Therefore, some
effective measure must be taken to lower the R410A concentration in air below 0.3kg/m3, in case of leakage.
As for R410A, this consideration is applied similarly.
2. Calculation of Refrigerant Concentration
(1) Calculate the total quantity of refrigerant R (kg) charged in the system connecting all the indoor units of
objective rooms.
(2) Calculate the room volume V (m3) of each objective room.
(3) Calculate the refrigerant concentration C (kg/m3) of the room according to the following equation.
R: Total Quantity of Charged Refrigerant (kg)
V: Room Volume (m3)
= C: Refrigerant Concentration ≤0.3 (kg/m3)
If local codes or regulations are specified, follow them.
<Example>
British Standard BS4434 1989 Commercial office
Building Class D Occupancy C=0.17 (kg/m3)
Fig. 5.5 Evacuation and Refrigerant Charge
Special Attention Regarding Refrigerant Gas Leakage
Pay an attention to the critical gas concentration to avoid accidental refrigerant gas leakage before
installing air conditioning systems.
In the case that the calculated critical concentration is bigger than 0.3kg/m3, take the following actions.
1) Provide a gas leakage detector and exhaust fan(s) controlled by its gas leakage detector.
2) Provide each effective opening at the wall or door for ventilation to next door so that the critical gas
concentration can be maintained lower than the above value.
(Provide an opening more than 0.15% of floor surface at the lower part of a door.)
≤Critical Concentration (kg/m3)
Totally Charged Refrigerant Quantity in System (kg)
Room Space for each Indoor Unit (m3)
0.3 kg/m3
Weigher
(for Nitrogen Blow during Brazing
and Air Tight Test)
Gas Line
Liquid Line Indoor UnitIndoor Unit
Outdoor Unit
Stop Valve (Liquid Line)
Stop Valve (Gas Line)
Manifold Gauge
Vacuum Pump
Nitrogen Tank
Refrigerant Cylinder
(R410A)
Multi-Kit Insulation
Insulation
Cover the flare nut and
unit with thermal insulator.

14
5.6 Multi-Kit
Table 5.7 Multi-Kit for Line Branch (1/2)
Multi-Kit E-102SN
Gas
Line
Liquid
Line
Multi-Kit E-162SN
Gas
Line
Liquid
Line
Unit: mm, ID: Inner Diameter, OD: Outer Diameter
ID 22.2
ID 22.2
ID 19.05
ID 12.7
ID 15.88
ID 19.05
ID 15.88
ID 15.88
ID 12.7
φ25.4
φ19.05
φ22.2
Q'ty: 2
ID 9.53
ID 9.53
ID 9.53
ID 6.35
ID 6.35
ID 9.53 OD 6.35
φ12.7
φ9.53
φ9.53
ID 25.4
ID 28.6
ID 22.2
ID 19.05
ID 15.88
ID 12.7
ID 12.7
ID 19.05
ID 22.2
ID 28.6
ID 25.4 ID 15.88
ID 25.4
OD 28.6
φ22.2
φ25.4
φ22.2
ID 12.7
ID 12.7
ID 9.53
ID 6.35
ID 9.53
ID 9.53
ID 12.7 OD 6.35
φ12.7
φ9.53
φ9.53

15
Table 5.8 Multi-Kit for Line Branch (2/2)
Multi-Kit E-242SN
Gas
Line
Liquid
Line
Multi-Kit E-302SN
Gas
Line
Liquid
Line
Unit: mm, ID: Inner Diameter, OD: Outer Diameter
ID 25.4
ID 28.6
ID 22.2
ID 19.05
ID 15.88
ID 12.7
ID 28.6
ID 25.4
ID 25.4 ID 19.05
ID 22.2
ID 15.88
ID 12.7
OD 28.6
φ22.2
φ25.4
φ22.2
ID 9.53
ID 9.53
ID 12.7
ID 15.88
ID 15.88
ID 12.7
ID 9.53
ID 6.35
ID 15.88
OD 6.35
φ25.4
φ19.05
φ19.05
Q'ty: 2
φ38.1
ID 34.92
ID 32.0
ID 38.1
ID 28.6
ID 38.1
ID 32.0
ID 25.4
ID 28.6
ID 22.2
ID 25.4
ID 15.88
ID 12.7
ID 19.05
ID 22.2
OD 28.6
OD 31.75
φ31.75
φ31.75
φ28.6
ID 9.53
ID 9.53
ID 15.88
ID 19.05
ID 22.2
ID 12.7
ID 12.7
ID 15.88
ID 19.05
ID 22.2
ID 6.35
ID 9.53
OD 6.35
φ25.4
φ22.2
φ19.05

16
Table 5.9 Multi-Kit for Header Branch
Multi-Kit E-84HSN
Gas
Line
Liquid
Line
Multi-Kit E-108HSN
Gas
Line
Liquid
Line
Unit: mm, ID: Inner Diameter, OD: Outer Diameter
Q'ty: 10
Q'ty: 6
ID 9.53
ID 6.35
ID 9.53
ID 12.7
ID 6.35
ID 9.53
OD 6.35
OD 6.35
φ19.05
φ9.53
φ9.53 φ6.35
Q'ty: 2
Q'ty: 6
ID 15.88
ID 12.7
ID 19.05
ID 22.2
ID 15.88
ID 19.05
ID 15.88 ID 12.7
ID 15.88
ID 12.7
OD 12.7
OD 12.7
φ22.2
φ12.7
φ19.05
φ15.88
Q'ty: 7
ID 9.53
OD 6.35
OD 6.35
ID 9.53
ID 6.35ID 6.35
ID 9.53
φ19.05
φ9.53
φ6.35 φ9.53
φ9.53
Q'ty: 2
Q'ty: 2
Q'ty: 2
ID 15.88
ID 19.05
ID 15.88
ID 12.7
ID 15.88
ID 12.7
OD 12.7
OD 12.7
φ15.88
φ19.05
φ12.7