Hitachi RUA-NP5ATS User manual

Installation, Operation and
Maintenance
INSTRUCTIONS MANUAL
SELF-CONTAINED
AIR CONDITIONERS
Models ：
RUA-NP5ATS
RUA-NP8ATS
RUA-NP10ATS
RUA-NP15ATS
REFRIGERANT:
R410A
IMPORTANT:
READ AND UNDERSTAND
THIS
INSTRUCTION MANUAL
BEFORE
USING THIS AIR
CONDITIONER.
KEEP THIS MANUAL FOR
FUTURE
REFERENCE.
65MP3212

Model
M
a
x
i
m
u
m
Min
i
m
u
m
M
a
x
i
m
u
m
M
in
i
m
u
m
All
Models
43°C
109°F
21°C
70°F
32°C /
22.5°C
90°F /
72.5°F
21°C /
15.5°C
70°F /
60°F
IMPORTANT NOTICE
 HITACHI pursues a policy of continuing improvement in design and performance of products.
The
right is therefore reserved to vary specification without
notice.
 HITACHI cannot anticipate every possible circumstance that might involve a potential hazard.
 No part of this manual may be reproduced without written
permission.
 Signal 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.
:
:
:
NOTE :
Immediate hazards which WILL result in severe personal injury
or
death.
Hazards or unsafe practices which COULD result in severs
personal
injury or
death.
Hazards or unsafe practices which COULD result in minor
personal
injury or product or property
damage.
Useful information for this operation and/or
maintenance.
 If you have any questions, contact your contractor or dealer of HITACHI
.
 This manual gives a common description and information for this air conditioner which you
operate as well as for other models.
 This air conditioner has been designed for the following temperatures. Operate the air conditioner
within this range
.
Condenser Air Inlet Temperature and Evaporator Air Inlet
Temperature
This manual should be considered as a permanent part of the air conditioning equipment and should
remain with the air conditioning equipment
Hitachi’s air conditioners are designed and manufactured based on using the specified refrigerants. The applicable
refrigerants are specified to each unit models. However, in the global sites, it is revealed that charging different type
of refrigerants instead of the specified refrigerants. This action may cause mechanical troubles, malfunction and
failure, and in the worst case, it endangers
safety
seriously and may cause a fire or an explosion.
Therefore, do not charge the non-specified refrigerants or others in the refrigerant cycle of the unit as follows:
 Hydrocarbon Refrigerants such as Propane or etc.
 Oxygen, Flammable Gases such as Acetylene or etc.
 Poisonous Gases.
The types of charging refrigerants are indicated in the Installation and Maintenance Manuals, Technical Catalogs,
Service Manuals and the
specification
label in the each unit. Be aware that Hitachi does not take any
responsibility
for unit failure, troubles of malfunction, and any accidents caused by charging the
non-specified refrigerants or others such as above.
Condenser Air Inlet Temperature
-Dry Bulb-
Evaporator Air Inlet Temperature
-Dry/Wet Bulb-

— CONTENTS —
No. Item .................................................................................................. Page
Operation Instructions.......................................................................... Ⅰ
1. PREPARATION ................................................................................... 1
1.1 Initial Check........................................................................................................... 1
1.2 Transportation ....................................................................................................... 1
1.3 Placing the Unit ..................................................................................................... 2
2. INSTALLATION .................................................................................. 3
2.1 Ducting Arrangement ............................................................................................ 3
2.2 Condensate Drain Piping ...................................................................................... 3
3. ELECTRICAL WIRING ....................................................................... 4
3.1 Main Power W iring P rocedures ............................................................................. 4
3.2 Control W iring ....................................................................................................... 4
4. FAN SPEED ADJUSTMENT ............................................................... 5
5. REMOVING SHIPPING WASHERS ................................................... 6
6. TEST RUNNING ................................................................................. 7
6.1 Final Installation Check ......................................................................................... 7
6.2 Preparation............................................................................................................ 7
6.3 Test Running ......................................................................................................... 7
6.4 Test Running Record ............................................................................................ 8
6.5 Safety and Control Device Setting......................................................................... 9
7. MAINTENANCE................................................................................... 10
8. WINTER SHUTDOWN......................................................................... 11
9. REPLACEMENT OF PARTS ............................................................... 11
10. TROUBLESHOOTING......................................................................... 13

Ⅰ
HITACHI SELF-CONTAINED AIR
COND
I
T
I
ONERS
OPERATION INSTRUCTIONS Models：RUA-NP5ATS
RUA-NP8ATS
RUA-NP10ATS
RUA-NP15ATS
Starting
Procedures
1. Switch ON the main power source to the
unit.
2. Set the operation switch of the room
thermostat
to the desired operation
position.
FAN – Ventilation
Operation
COOL – Cooling
Operation
3. Set the thermostat knob of the room
thermostat
to the desired
temperature.
4. Set the system switch of the room thermostat
to
the ON
positions.
Stopping
Procedures
1. Set the system switch to the OFF
position.
2. Switch OFF the main power source to the
unit.
Troubleshooting
Unit Does Not
Start
1. Is the main power source switch to the unit
ON?
2. Is the main fuse
normal?
3. Is the phase of main power source
right?
Poor Cooling
Operation
1. Are there any obstacles, which hamper
sufficient
air to the
condenser?
2. Check to ensure that the thermostat is set at
the
desired
position.
3. Check the air filter for
clogging.
4. Are there any obstacles, which hamper free
air
flow to the room
thermostat?
Please contact your service shop if
the
trouble is still not
solved.
Maintenance
1. Clean or replace the
filter.
2. Clean the cabinet with
cleaner.
3. Clean the condensate drain pan and the
drain
piping.
4. Clean the condenser. It is recommended that
a
specialist be contacted for this type of
work.
5. Check for abnormal sounds and vibration.
Stop
the unit and contact your service shop,
if
observed.

1
1.
PREPARATION
1.1 Initial
Check
Required Materials – Measure,
Archi t ec t ural
Information Regarding Installation
Loca t ion .
Installation Location – Confirm that the
f inal
Installation location is provided with
convenien t
piping and wiring work. Strong water runoff
should
be
avoided .
Installation Space – Check for obstacles,
which
restrict condenser airflow or hamper
maintenance
work in the space specified in Fig.
1 .
Foundation – Check to ensure that the
f ounda t ion
is flat, level, and sufficiently strong, taking
in t o
account the maximum foundation gradient (Fig.
2)
and the unit weight balance. Confirm
eleva t ion
provision for the unit on a solid base with an
iron
frame or concrete curbs shown in Fig. 3, in
order
to obtain proper clearance beneath the unit
f or
PREPARATION
either rooftop or on-the-ground
ins t alla t ion .
Additionally, for on-the-ground installation,
provide
a
gravel or concrete space around the
condenser
air
intake, in order to avoid airflow obstruction
due
to
grass or other
vege t a t ion .
Unit – Check to ensure that the unit has
been
transported without damage. File a damage
claim
with the transportation c ompanies if
mishandling
due to transportation company negligence
is
suspec t ed .
1.2
Transportation
Secure the route to the final installation location
by
confirming the packing dimensions (see
" Uni t
General Data" in Technical Catalog I
.)
(mm)
Model
Unit
Dimensions
Minimum
Maintenance
Space
Minimum
Air
Intake
Space
Maximum
Height
of
Wall
a b h
A B C D E H
RUA-NP5ATS 1 , 020 1 , 475 1 , 070 1 , 000 1 , 000 1 , 000 1 , 200 1 , 200 1 , 070
RUA-NP8ATS 1 , 020 1 , 475 1 , 070 1 , 000 1 , 000 1 , 000 1 , 200 1 , 200 1 , 070
RUA-NP10ATS 1 , 360 1 , 750 1 , 070 1 , 000 1 , 000 1 , 000 1 , 000 1 , 200 1 , 070
RUA-NP15ATS 1 , 430 2 , 140 1 , 070 1 , 000 1 , 000 1 , 000 1 , 000 1 , 200 1 , 070
NOTE :
Fig. 1. Operation
Space
When the unit is installed at a location, which is encircled with walls and obstruction to free
air
circulation is suspected, consult HITACHI regarding the operation
space .

2
PREPARATION
Model
Dimensions
A B
deg . mm deg . mm
RUA-NP5ATS 0 . 4 10 0 . 6 11
RUA-NP8ATS 0 . 4 10 0 . 6 11
RUA-NP10ATS 0 . 4 12 0 . 6 14
RUA-NP15ATS 0 . 4 15 0 . 6 15
Fig. 2. Foundation
Gradient
Model
Dimension
(mm)
a b
RUA-NP5ATS
960 1 , 435
RUA-NP8ATS 960 1 , 435
RUA-NP10ATS 1 , 300 1 , 709
RUA-NP15ATS 1 , 370 2 , 102
Fig. 3. Recommended Concrete
Curbs
1.3 Placing the
Unit
Tools and Instruments – Pincers,
Wrenches,
Facilities to Transport and Place the
Uni t.
Transportation – Transport the unit as close
t o
the
final installation location as practical
be f ore
unpacking is performed. Keep the unit
uprigh t.
When transporting the unit after unpacking
has
been performed, take note of the
f ollowing .
Rolling – Place three equal - sized rollers
under
the base frames. Each roller must carry both of
t he
outer frames, and must be situated to balance
t he
unit (refer to the center of gravity in Fig.
4) .
Lifting by Forklift – Insert the forks under
t he
base frames from the indicated direction in
Fig . 4 .
Lift the unit, exercising care to catch both of
t he
outer
f rames .
Rigging –
Apply spreader bars to the top of the
unit, in order to prevent damage to the unit due to
cable scratches.
Unpacking – Follow the instructions marked on
the
packing
.

3
INSTALLATION
Model
Dimensions
(mm)
Weight
(kg)
A B C D
Fig. 4. Center of
Gravity
2.
INSTALLATION
2.1 Ducting
Arrangement
Tools and Instruments – General tools
f or duc t ing .
Connection – Pre-drilled duct flanges
are
provided
at the supply and return air
duc t
connections. A
field-supplied or optional filter
box
with filter must
be installed at a proper location
in
the return air
duct. It is recommended that
f lexible
duct
connections be installed to minimize
sound
and
vibration transmission. All ducts
running
outside
must be sufficiently insulated
and wea t herproo f ed .
2.2 Condensate Drain
Piping
Tools and Instruments – General piping
t ools .
Drain Trap – A female piping thread screw
connection is provided at side of the unit.
Dimension “L” in Fig. 5 should be sufficiently longer
than the negative fan pressure at the drain
connection (50mm to 100mm, depending on the
return air duct design). Always fill the trap with
water.
Fig. 5. Condensate Drain
Connection
RUA-NP15ATS
800 625
780 1300 450
RUA-NP10ATS 810 550 690 1000
40
0
RUA-NP8ATS 615 405 685 730 250
RUA-NP5ATS 615 405 685 730 240

4
ELECTRICAL
WIRING
3. ELECTRICAL
WIRING
Tools and Instruments – One set of wiring
t ools ,
electrical tester (Clamp
me t er) .
Schedule Check – Confirm that the field
selec t ed
electrical components (main power switch,
f uses ,
wires, conduit connections, wire terminals)
are
properly selected according to "Electrical Data"
in
Technical Catalog Ⅰ, and ensure that they
comply
with national and local codes. It is
recommended
that the main power switch be locked at the
OFF
position, to prevent against accidental supply
o f
the power during unit
servicing .
Service Panel – Access to the magnetic
swi t ch
box is provided from the service panel, which
is
fixed with screws (see the panel location in
t he
Operation
I ns t ruc t ions . )
3.1 Main Power Wiring
Procedures
Confirm that electrical power is not
being
supplied to the installation location prior to
any
electrical installation
work .
1. Install the field-supplied main switch box at
t he
properly selected
loca t ion .
2. Install conduit connectors in the hole for
power
wiring (knockout
holes) .
3. Lead the main power wires and the
ear t hing
wire through the connector to the
screw
terminals for main power and earthing in
t he
magnetic switch box. The neutral wire to
220V
power supplies should also be led
t hrough
the
connector. Firmly connect the wires
wi t h
wire terminals to the unit screw
t erminals
R(L1), S(L2) and T(L3) for 220V
power
supplies according to Fig. 6 or the wiring
label
attached to the magnetic switch
box .
A scroll compressor is equipped. Because
t ha t
the rotation direction of the orbiting scroll of
t he
HITACHI scroll type compressor is
f ixed ,
therefore a reverse & single phase
sequence
protection relay is equipped in this unit. If
each
phase R, S or T of t h e power source
is
incorrectly connected, the compressor does
no t
start due to the activation of the reverse &
single
phase sequence protection relay. Therefore,
in
order to check the correct wiring connection,
t he
utilization of a phase sequence indicator
is
recommended when the unit is started
a ft er
installation of the
uni t.
(1) If the phase is wrong, exchange two of
t he
three wires connected from the main
power
source to the main terminals of the unit
as
indicated with dotted lines, and then check
t he
rotation direction of the phase
sequence
indicator once again. Do not exchange the
wires in the unit in order to protect
t he
compressor against the reversal
ro t a t ion .
Unit
Side
R S
T
(2) Do not operate the compressor by
depressing
the button of the magnetic switch for
t he
compressor .
A three-phase condenser fan motor is equipped;
therefore, the fan motor rotation should be
checked. Interchange two of the three main power
source wires, if incorrect rotation is detected during
initial start-up.
3.2 Control
Wiring
Install the optional room thermostat at a
sui t able
location in the space to be
air-condi t ioned .
Connect
the control wires between the
uni t
terminals and the
thermostat terminals
according
to Fig. 6 or the
wiring
label .
Fig. 6. Field Wiring
Connection
Power Source

5
4. FAN SPEED
ADJUSTMENT
The unit is equipped with an adjustable motor
pulley. The fan speed can be varied through a given
range by adjustment of the pulley. Table
1 .
shows
the setting speed and the variable speed range.
To change the speed, adjust the motor pulley as
follows (refer to Fig.
7) .
1. Loosen the two bolts on the adjusting
bracke t
for the fan belt tension and loosen the belt
by
pushing the motor
upward .
2. Loosen the set screw in the movable pulley
f lange .
FAN SPEED
ADJUSTMENT
3. Turn the movable pulley flange toward the
f ixed
flange to increase the speed, and turn it
away
from the fixed flange to decrease the speed
.
Each turn of the movable flange will increase
or
decrease the fan speed by 40 to 45
rpm .
4. Tighten the set screw in the movable pulley
,
which is positioned over the flat surfaces of
t he
fixed
pulley .
5. Adjust the belt tension (approximately 20
mm
deflection with one finger) by pushing the
mo t or
downward and tightening the bolts on
t he
adjusting
bracket .
Fig. 7. Adjustable Motor
Pulley
Table 1-1. Fan Speed
Adjustment
Models
X
：
Regulation Space of Motor Pulley
(mm)
PD：Pitch Diameter of Motor Pulley
(mm)
Factory Set
Poin t
RPM / Turn**
X 0 1 2 3 4 5 6 7 X
RPM PD*
PD 112 109 106 103 99 96 93 90
RUA-NP5ATS
RPM 1,120 1,090 1,060 1,025 995 960 930 900 7 900 90 45
RUA-NP8ATS
RPM 1,120 1,090 1,060 1,025 995 960 930 900 7 900 90 45
RUA-NP10ATS
RPM 1,120 1,090 1,060 1,025 995 960 930 900 6 930 93 45
Models
X
：
Regulation Space of Motor Pulley
(mm)
PD：Pitch Diameter of Motor Pulley
(mm)
Factory Set
Poin t
RPM / Turn**
X 17 18 19 20 21 22 23 24 X
RPM PD*
PD 112 109 106 103 99 96 93 90
RUA-NP5ATS
RPM 1,120 1,090 1,060 1,025 995 960 930 900 21.5 970 99 45
RPM: Fan Speed
(rpm)
PD*: Pitch Diameter of Motor Pulley
(mm)
RPM/Turn**: Fan Speed Change per One Turn of Movable Motor
Pulley
Flange (RPM per Turn)

6
REMOVING SHIPPING
WASHERS
5. REMOVING SHIPPING
WASHERS
Compressor is mounted on rubber isolators, and is held rigidly during shipment by two sets of shipping
washers. Before starting the compressor, remove the yellow-painted shipping washers, the compressor should
float freely on the rubber isolators.
Fig. 10. Removing Shipping Washers