Mitsubishi PU(H)Y-P-YEM-A Installation Manual
Air-Conditioners For Building Application
OUTDOOR UNIT
PUHY-P-YEM-A
PUY-P-YEM-A
GB
D
F
INSTALLATION MANUAL
For safe and correct use, please read this installation manual thoroughly before installing the air-conditioner unit.
INSTALLATIONSHANDBUCH
Zum sicheren und ordnungsgemäßen Gebrauch der Klimageräte das Installationshandbuch gründlich durchlesen.
MANUEL D’INSTALLATION
Veuillez lire le manuel d’installation en entier avant d’installer ce climatiseur pour éviter tout accident et vous assurer d’une utilisation correcte.
MANUAL DE INSTALACIÓN
Para un uso seguro y correcto, lea detalladamente este manual de instalación antes de montar la unidad de aire acondicionado.
MANUALE DI INSTALLAZIONE
Per un uso sicuro e corretto, leggere attentamente questo manuale di installazione prima di installare il condizionatore d’aria.
INSTALLATIEHANDLEIDING
Voor een veilig en juist gebruik moet u deze installatiehandleiding grondig doorlezen voordat u de airconditioner installeert.
MANUAL DE INSTALAÇÃO
Para segurança e utilização correctas, leia atentamente este manual de instalação antes de instalar a unidade de ar condicionado.
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Для осто ожного и п авильного использования п ибо а необходимо тщательно ознакомиться с данным уководством по
установке до выполнения установки кондиционе а.
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MONTAJ ELK‹TABI
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4
AAFA
B
A
[Fig. 4.0.1]
(1)
(3)
B
<A>
>
L2
=
>
L1
=
A
<A> : Top view
<B> : Side view
<C> : When there is little space up to an obstruc-
tion
A : Front
B : No restrictions on wall height (left and right)
C : Air outlet guide (Procured at the site)
<B>(2)
>
45°
=
>
1000
>
300
=
=
<C>
(5)
>
L2
E
=
DD
AA
>
>
1000
=
E
D
AAAAA
>
>
>
L
1
L
1
=
=
>
L
1
L
=
=
E
E
>
1
L
1
=
L1
=
E
>
L
2
=
>
L
2
=
C
>
900
=
>
L
2
=
>
2
L
=
D
>
900
=
<A>
DD
>
1000
<B>
>
L
1
=
>
L
2
=
=
AA
E
E
>
L
2
=
A
A
>
L
1
=
Hh
>
=
1000
A
D
>
=
A
1000
(4)
<A>
>
=
L
2
<B>
>
L
1
=
>
L
2
=
A
>
L
1
=
650
Hh
h
325
H
A
5 6
[Fig. 5.0.1]
<
40°
=
<
7m
=
D : Must be open
E : Wall height (H)
F : No restrictions on wall height
(mm)
L1 L2
450 250
[Fig. 6.1.1]
<
7m
=
A : M10 anchor bolt procured at the site.
B : Corner is not seated.
2
7
L
M
1
3
7.2
8
8.2
[Fig. 7.2.1]
A
A
B C D
a b c d
B
C
CCC
e
C
A
A
A : Outdoor Unit
B
b
a
c d
CC
D
e
CCC
C
A (mm)
Å Liquid pipe ı Gas pipe
PU(H)Y-P200 ø12.7 ø25.4
PU(H)Y-P250 ø12.7 ø28.58
PU(H)Y-P315 ø12.7 ø31.75
B, C, D (mm)
Ç Total capacity of indoor units Å Liquid pipe ı Gas pipe
~ 80 ø9.52 ø15.88
81 ~ 160 ø12.7 ø19.05
161 ~ 330 ø12.7 ø25.4
331 ~ ø12.7 ø31.75
a, b, c, d, e (mm)
Î Model number Å Liquid pipe ı Gas pipe
20,25,32,40 ø6.35 ø12.7
50,63,71,80 ø9.52 ø15.88
100,125,140 ø9.52 ø19.05
200 ø12.7 ø25.4
250 ø12.7 ø28.58
‰ Downstream Unit Model Total Ï Branch Kit Model
~ 160 CMY-Y102S-F
161 ~ 330 CMY-Y102L-F
331 ~ CMY-Y202-F
Ì 4-Branching Header Ó 7-Branching Header È 10-Branching Header
CMY-Y104-F CMY-Y107-F CMY-Y1010-F
B : First Branch
C : Indoor unit
D : Cap
[Fig. 8.2.1]
[Fig. 8.2.2]
A
B
C
D
[Fig. 8.2.3]
<A> [Ball valve (gas side)]
(This figure shows the valve
in the fully open state.)
EE
S
O
J
<B> [Ball valve (liquid side)]
S
O
I
A : Valve stem
B : Stopper pin
C : Packing (Accessory)
K
D : Connecting pipe (Accessory)
E : Open (Operate slowly)
F : Cap, copper packing
G : Service port
H : Flare nut
I : ø12.7
J : ø25.4 (PU(H)Y-P200)
ø28.58 (PU(H)Y-P250)
ø31.75 (PU(H)Y-P315)
K : Field piping
L : Close-packed packing
M : Hollow packing
F
G
H
[Fig. 8.3.1]
A
C
[Fig. 8.3.3]
8.3
[Fig. 8.3.2]
LO
B
A
HI
G
H
I
J
A : Nitrogen gas
B : To indoor unit
C : System analyzer
D : Lo Knob
E : Hi Knob
F : Ball valve
G : Liquid pipe
H : Gas pipe
I : Outdoor unit
J : Service port
F
B
C
LO
D
HI
E
In case of the cylinder having no syphon pipe.
D
E
F
C
G
H
I
K
J
L
A
A : Syphon pipe
M
A : System analyzer
B : Lo Knob
C : Hi Knob
D : Ball valve
E : Liquid pipe
F : Gas pipe
G : Service port
H : Three-way joint
I : Valve
J : Valve
K : Cylinder
L : Scale
M : Vacuum pump
3
8.4
C
A
B
D
E
BA
C
3N~380–415V
L
1, L2, L3, N, PE
BA
~220–240V
L, N, PE
E EDE E
A B C
E
D
M1 M2
M1 M2 S
TB7
TB3
IC
(51)
M1 M2 S
TB5
RC
(01)
IC
M1 M2 S
TB5
(02)
IC
M1 M2 S
TB5
(04)
IC
M1 M2 S
TB5
(03)
IC
M1 M2 S
TB5
(05)
IC
M1 M2 S
TB5
(07)
IC
M1 M2 S
TB5
(06)
L
2
L
1
(101)
RC
(105)
RC
(103)
RC
(155)
OC
M1 M2
M1 M2 S
TB7
TB3
(52)
OC
r
3
M1M2S
Power Supply
Unit
M1M2S
MJ103
L
3
L
6
L
7
L
4
L
5
r
2
r
4
r
1
AB AB AB
AB
A B C
E
D
M1 M2
M1 M2 S
TB7
TB3
IC
(51)
M1 M2 12S
TB5 TB15
12
TB15
12
TB15
12
TB15
12
TB15
12
TB15
MA
(01)
IC
M1 M2 S
TB5
(02)
IC
M1 M2 S
TB5
(04)
IC
M1 M2 S
TB5
(03)
IC
M1 M2 S
TB5
(05)
IC
M1 M2 S
TB5
(07)
IC
M1 M2 S
TB5
(06)
L
2
L
1
MAMAMA
OC
M1 M2
M1 M2 S
TB7
TB3
(52)
OC
c
1
c
4
c
3
S
Power Supply
Unit
S
MJ103
L
3
L
6
L
7
L
4
c
2
ABABAB
AB
M1M2
M1M2
c
2
c
1
c
1
c
2
[Fig. 8.4.1]
A : Steel wire B : Piping
C : Asphaltic oily mastic or asphalt
D : Heat insulation material A
E : Outer covering B
9
[Fig. 9.2.1]
[Fig. 9.3.1]
9.2
L1 L2 L3 N M1M2 M1M2 S
TB1
TB3 TB7
AB
9.3
A : Power source
B : Transmission line
[Fig. 8.4.2]
A
B
C
D
E
E
B
E
A
D
A : Liquid pipe B : Gas pipe
C : Electric wire D : Finishing tape
E : Insulater
[Fig. 8.4.3]
[Fig. 8.4.4]
<A> Inner wall (concealed)
A B
<B> Outer wall
D
C
[Fig. 9.3.2]
A B
<C> Outer wall (exposed)
E
I
<E> Roof pipe shaft
G
<D> Floor (waterproofing)
B
<F> Penetrating portion on fire
limit and boundary wall
I
D
D
B
H
A
F
A : Sleeve B : Heat insulating material
C : Lagging D : Caulking material
E : Band F : Waterproofing laye
G : Sleeve with edge H : Lagging material
I : Mortar or other incombustible caulking
J : Incombustible heat insulation material
4
F
A : Group 1
B : Group 3
C : Group 5
G
B
[Fig. 9.4.1]
A : Switch (Breakers for Wiring and Current Leakage)
B : Breakers for Current Leakage
C : Outdoor Unit
9.4
J
1m1m
D : Shielded Wire
E : Sub Remote
Controller
D : Pull Box
E : Indoor Unit
Contents
1. Safety precautions ...................................................................................... 5
1.1. Before installation and electric work .......................................... 5
1.2. Precautions for devices that use R407C refrigerant .................. 5
1.3. Before installation ...................................................................... 6
1.4. Before installation - electrical work ............................................ 6
1.5. Before starting the test run ........................................................ 6
2. Specifications .............................................................................................. 6
3. Confirmation of par ts attached ................................................................... 6
4. Space required around unit ........................................................................ 7
5. Lifting method and weight of product .......................................................... 7
6. Installation of unit ........................................................................................ 7
6.1. Installation ................................................................................. 7
7. Refrigerant piping installation ..................................................................... 7
7.1. Caution ...................................................................................... 7
7.2. Refrigerant piping system .......................................................... 8
1. Safety precautions
1.1. Before installation and electric work
s Before installing the unit, make sure you read all the “Safety
precautions”.
s The “Safety precautions” provide very important points re-
garding safety. Make sure you follow them.
Symbols used in the text
Warning:
Describes precautions that should be observed to prevent danger of injury
or death to the user.
Caution:
Describes precautions that should be observed to prevent damage to the
unit.
Symbols used in the illustrations
: Indicates an action that must be avoided.
: Indicates that important instructions must be followed.
: Indicates a part which must be grounded.
: Beware of electric shock. (This symbol is displayed on the main unit label.)
<Color: yellow>
Warning:
Carefully read the labels affixed to the main unit.
Warning:
• Ask the dealer or an authorized technician to install the air conditioner.
- Improper installation by the user may result in water leakage, electric shock,
or fire.
• Install the unit at a place that can withstand its weight.
- Inadequate strength may cause the unit to fall down, resulting in injuries.
• Use the specified cables for wiring. Make the connections securely so
that the outside force of the cable is not applied to the terminals.
- Inadequate connection and fastening may generate heat and cause a fire.
• Prepare for strong winds and earthquakes and install the unit at the specified place.
- Improper installation may cause the unit to topple and result in injury.
• Always use an filter and other accessories specified by Mitsubishi Electric.
- Ask an authorized technician to install the accessories. Improper installation
by the user may result in water leakage, electric shock, or fire.
• Never repair the unit. If the air conditioner must be repaired, consult the
dealer.
- If the unit is repaired improperly, water leakage, electric shock, or fire may
result.
• Do not touch the heat exchanger fins.
- Improper handling may result in injury.
• If refrigerant gas leaks during installation work, ventilate the room.
- If the refrigerant gas comes into contact with a flame, poisonous gases will
be released.
• Install the air conditioner according to this Installation Manual.
- If the unit is installed improperly, water leakage, electric shock, or fire may
result.
• Have all electric work done by a licensed electrician according to “Electric Facility Engineering Standard” and “Interior Wire Regulations”and
the instructions given in this manual and always use a special circuit.
8. Additional Refrigerant Charge .................................................................... 8
8.1. Calculation of Additional Refrigerant Charge ............................ 8
8.2. Precautions concerning piping connection and
valve operation .......................................................................... 8
8.3. Airtight test, evacuation, and refrigerant charging ..................... 9
8.4. Thermal insulation of refrigerant piping ................................... 10
9. Wiring ........................................................................................................ 10
9.1. Caution .................................................................................... 10
9.2. Control box and connecting position of wiring ......................... 10
9.3. Wiring transmission cables ...................................................... 10
9.4. Wiring of main power supply and equipment capacity ............ 11
10. Test run ..................................................................................................... 12
10.1. The following phenomena do not represent trouble
(emergency) ............................................................................ 12
- If the power source capacity is inadequate or electric work is performed improperly, electric shock and fire may result.
• Securely install the outdoor unit terminal cover (panel).
- If the terminal cover (panel) is not installed properly, dust or water may enter
the outdoor unit and fire or electric shock may result.
• When installing and moving the air conditioner to another site, do not
charge it with a refrigerant different from the refrigerant specified on the
unit.
- If a different refrigerant or air is mixed with the original refrigerant, the refrig-
erant cycle may malfunction and the unit may be damaged.
• If the air conditioner is installed in a small room, measures must be taken
to prevent the refrigerant concentration from exceeding the safety limit if
the refrigerant should leak.
- Consult the dealer regarding the appropriate measures to prevent the safety
limit from being exceeded. Should the refrigerant leak and cause the safety
limit to be exceeded, hazards due to lack of oxygen in the room could result.
• When moving and reinstalling the air conditioner, consult the dealer or
an authorized technician.
- If the air conditioner is installed improperly, water leakage, electric shock, or
fire may result.
• After completing installation work, make sure that refrigerant gas is not
leaking.
- If the refrigerant gas leaks and is exposed to a fan heater, stove, oven, or
other heat source, it may generate noxious gases.
• Do not reconstruct or change the settings of the protection devices.
- If the pressure switch, thermal switch, or other protection device is shorted
and operated forcibly, or parts other than those specified by Mitsubishi Electric are used, fire or explosion may result.
• To dispose of this product, consult your dealer.
• The installer and system specialist shall secure safety against leakage
according to local regulation or standards.
- Following standards may be applicable if local regulation are not available.
• Pay special attention to the place of installation, such as a basement, etc.
where refrigeration gas can accumulate, since refrigeration is heavier
than the air.
1.2. Precautions for devices that use R407C
refrigerant
Caution:
• Do not use existing refrigerant piping.
- The old refrigerant and refrigerator oil in the existing piping contains a large
amount of chlorine which may cause the refrigerator oil of the new unit to
deteriorate.
• Use refrigerant piping made of phosphorus deoxidized copper and copper alloy seamless pipes and tubes. In addition, be sure that the inner
and outer surfaces of the pipes are clean and free of hazardous sulphur,
oxides, dust/dirt, shaving particles, oils, moisture, or any other contaminant.
- Contaminants on the inside of the refrigerant piping may cause the refriger-
ant residual oil to deteriorate.
• Store the piping to be used during installation indoors and keep both
ends of the piping sealed until just before brazing. (Store elbows and
other joints in a plastic bag.)
- If dust, dirt, or water enters the refrigerant cycle, deterioration of the oil and
compressor trouble may result.
• Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator
oil to coat flares and flange connections.
- The refrigerator oil will degrade if it is mixed with a large amount of mineral
oil.
• Use liquid refrigerant to fill the system.
- If gas refrigerant is used to seal the system, the composition of the refriger-
ant in the cylinder will change and performance may drop.
5
GB
D
F
E
INL
PGRRUTR
• Do not use a refrigerant other than R407C.
- If another refrigerant (R22, etc.) is mixed with R407C, the chlorine in the
refrigerant may cause the refrigerator oil to deteriorate.
• Use a vacuum pump with a reverse flow check valve.
- The vacuum pump oil may flow back into the refrigerant cycle and cause the
refrigerator oil to deteriorate.
• Do not use the following tools that are used with conventional refrigerants.
(Gauge manifold, charge hose, gas leak detector, reverse flow check valve,
refrigerant charge base, refrigerant recovery equipment)
- If the conventional refrigerant and refrigerator oil are mixed in the R407C,
the refrigerant may deteriorated.
- If water is mixed in the R407C, the refrigerator oil may deteriorate.
- Since R407C does not contain any chlorine, gas leak detectors for conven-
tional refrigerants will not react to it.
• Do not use a charging cylinder.
- Using a charging cylinder may cause the refrigerant to deteriorate.
• Be especially careful when managing the tools.
- If dust, dirt, or water gets into the refrigerant cycle, the refrigerant may dete-
riorate.
1.3. Before installation
Caution:
• Do not install the unit where combustible gas may leak.
GB
- If the gas leaks and accumulates around the unit, an explosion may result.
• Do not use the air conditioner where food, pets, plants, precision instruments, or artwork are kept.
- The quality of the food, etc. may deteriorate.
• Do not use the air conditioner in special environments.
D
- Oil, steam, sulfuric smoke, etc. can significantly reduce the performance of
the air conditioner or damage its parts.
• When installing the unit in a hospital, communication station, or similar
place, provide sufficient protection against noise.
- Inverter equipment, private power generator, high-frequency medical equip-
F
ment, or radio communication equipment may cause the air conditioner to
operate erroneously, or fail to operate. On the other hand, the air conditioner
may affect such equipment by creating noise that disturbs medical treatment
or image broadcasting.
• Do not install the unit on a structure that may cause leakage.
E
- When the room humidity exceeds 80 % or when the drain pipe is clogged,
condensation may drip from the indoor unit. Perform collective drainage work
together with the outdoor unit, as required.
1.4. Before installation - electrical work
INL
Caution:
• Ground the unit.
- Do not connect the ground wire to gas or water pipes, lightning rods, or
telephone ground lines. Improper grounding may result in electric shock.
• The reverse phase of L lines (L
but the reverse phase of L lines and N line can not be detected.
- Some electric parts may be damaged when power is supplied during miss
wiring.
• Install the power cable so that tension is not applied to the cable.
- Tension may cause the cable to break and generate heat and cause a fire.
1, L2, L3) can detected (Error cord: 4103),
PGRRUTR
• Install a leak circuit breaker, as required.
- If a leak circuit breaker is not installed, electric shock may result.
• Use power line cables of sufficient current carrying capacity and rating.
- Cables that are too small may leak, generate heat, and cause a fire.
• Use only a circuit breaker and fuse of the specified capacity.
- A fuse or circuit breaker of a larger capacity, a steel or copper wire may result
in a general unit failure or fire.
• Do not wash the air conditioner units.
- Washing them may cause an electric shock.
• Be careful about that the installation base is not damaged by long use.
- If the damage is left uncorrected, the unit may fall and cause personal injury
or property damage.
• Install the drain piping according to this Installation Manual to ensure
proper drainage. Wrap thermal insulation around the pipes to prevent
condensation.
- Improper drain piping may cause water leakage causing damage to furniture
and other possessions.
• Be very careful about transporting the product.
- One person should not carry the product as it weighs more than 20 kg.
- Some products use PP bands for packaging. Do not use any PP bands as a
means of transportation. It is dangerous.
- Do not touch the heat exchanger fins. Doing so may cut your fingers.
- When transporting the outdoor unit, support it at the specified positions on
the unit base. Also support the outdoor unit at four points so that it cannot
slip sideways.
• Safely dispose of the packing materials.
- Packing materials, such as nails and other metal or wooden parts, may cause
stabs or other injuries.
- Tear apart and throw away plastic packaging bags so that children will not
play with them. If children play with a plastic bag which was not torn apart,
they face the risk of suffocation.
1.5. Before starting the test run
Caution:
• Turn on the power at least 12 hours before starting operation.
- Starting operation immediately after turning on the main power switch can
result in irreversible damage to internal parts. Keep the power switch turned
on during the operational season.
• Do not touch the switches with wet fingers.
- Touching a switch with wet fingers can cause electric shock.
• Do not touch the refrigerant pipes during and immediately after operation.
- During and immediately after operation, the refrigerant pipes may be hot or
cold, depending on the condition of the refrigerant flowing through the refrigerant piping, compressor, and other refrigerant cycle parts. Your hands may
suffer burns or frostbite if you touch the refrigerant pipes.
• Do not operate the air conditioner with the panels and guards removed.
- Rotating, hot, or high-voltage parts can cause injuries.
• Do not turn off the power immediately after stopping operation.
- Always wait at least five minutes before turning off the power. Otherwise,
water leakage and trouble may occur.
• Do not touch the surface of the compressor during servicing.
- If unit is connected to the supply and not running, crank case heater at com-
pressor base is operating.
2. Specifications
Model
Noise level
Net weight
Allowable pressure
External static pressure
Indoor units
Operation temperature
Total capacity
Model / Quantity
Cooling mode: – 5 °CDB ~ 43 °CDB (0 °CDB ~ 43 °CDB with outdoor unit at lower position)
Heating mode: – 12 °CWB ~ 15.5 °CWB
PU(H)Y-P200 PU(H)Y-P250 PU(H)Y-P315
56 dB <A> 57 dB <A> 60 dB <A>
PU(H)Y-P200, P250: 225 kg PU(H)Y-P315: 240 kg
2.94 MPa
0 Pa
50 ~ 130 %
20 ~ 250 / 1 ~ 13 20 ~ 250 / 1 ~ 16
3. Confirmation of parts attached
1 Wiring mounting board × 1 2 Conduit mounting plate (ø40) × 1 3 Conduit mounting plate (ø33) × 1
4 Conduit mounting plate (ø27) × 1 5 Tapping screw M4 × 6 6 Connecting pipe × 1 (Connecting pipe is fixed with the unit.)
7 Packing (inside ø23, outsideø35) × 1
6
4. Space required around unit
[Fig. 4.0.1] (P.2)
<A> Top view <B> Side view
<C> When there is little space up to an obstruction
A Front B No restrictions on wall height (left and right)
C Air outlet guide (Procured at the site) D Must be open
E Wall height (H) F No restrictions on wall height
(mm)
L1 L2
450 250
(1) Basic space required
A space of at least 250 mm is necessary at the back for inlet air. Taking ser vicing,
etc. from the rear into account, a space of about 450 mm should be provided, the
same as at the front.
(2) When there is an obstruction above the unit
(3) When inlet air enters from right and left sides of unit
• Wall heights (H) of the front and the rear sides shall be within overall height of
unit.
• When the total height is exceeded, add the “h” dimension of the Fig. 4.0.1 to L
and L2.
(4) When unit is surrounded by walls
Note:
• Wall heights (H) of the front and the back sides shall be within overall
height of unit.
• If the panel height is exceeded, add the “h” dimension of the Fig. 4.0.1 to
L
1 and L2.
(mm)
L1 L2
450 250
Example: When h is 100 mm,
(5) Collective installation and continuous installation
• Space required for collective installation and continuous installation:
• Open in two directions.
• In case wall height (H) exceeds overall height of unit, add “h” dimension (h =
1
• If there is a wall at both the front and the rear of the unit, install up to four units
the L
1 dimension becomes 450 + 100 = 550 mm.
When installing several units, leave the space between each block considering
passage for air and people.
wall height <H> – overall height of unit) to * marked dimension.
consecutively in the side direction and provide a space of 1000 mm or more as
inlet space/passage space for each four units.
5. Lifting method and weight of product
[Fig. 5.0.1] (P.2)
Caution:
Be very careful to carry product.
- Do not have only one person to carry product if it weighs more than 20 kg.
- PP bands are used to pack some products. Do not use them as a mean for transportation because they are dangerous.
- Do not touch heat exchanger fins with your bare hands. Otherwise you cut your hands.
- Tear plastic packaging bag and scrap it so that children cannot play with it. Otherwise plastic packaging bag may suffocate children to death.
- When carrying outdoor unit, be sure to support it at four points. Carrying with 3-point support may make outdoor unit unstable, resulting in it falling.
6. Installation of unit
GB
D
F
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6.1. Installation
[Fig. 6.1.1] (P.2)
A M10 anchor bolt procured at the site. B Cor ner is not seated.
• Fix unit tightly with bolts so that unit will not fall down due to earthquake or gust
of wind.
• Use concrete or angle bracket for foundation of unit.
• Vibration may be transmitted to the installation section and noise and vibration
may be generated from the floor and walls, depending on the installation conditions. Therefore, provide ample vibrationproofing (cushion pads, cushion
frame, etc.).
• Be sure that the corners are firmly seated. If the corners are not firmly seated,
the installation feet may be bent.
7. Refrigerant piping installation
Connecting the piping is a terminal-branch type in which refrigerant piping from
the outdoor unit is branched at the terminal and connected to each of the indoor
units.
The method of connection consists of flare connections at the indoor units, flange
connections for the piping of the outdoor unit and flare connections for the liquid
piping. Note that the branched sections are brazed.
Warning:
Always use extreme care to prevent the refrigerant gas from leaking while
using fire or flame. If the refrigerant gas comes in contact with the flame
from any source, such as a gas stove, it breaks down and generates a poisonous gas which can cause gas poisoning. Never weld in an unventilated
room. Always conduct an inspection for gas leakage after installation of the
refrigerant piping has been completed.
7.1. Caution
1 Use the following materials for refrigeration piping.
• Material: Use refrigerant piping made of phosphorus deoxidized copper.
In addition, be sure that the inner and outer surfaces of the pipes are clean
and free of hazardous sulphur, oxides, dust/dirt, shaving particles, oils,
moisture, or any other contaminant.
Warning:
• Be sure to install unit in a place strong enough to withstand its weight.
Any lack of strength may cause unit to fall down, resulting in a personal
injury.
• Have installation work in order to protect against a strong wind and earthquake.
Any installation deficiency may cause unit to fall down, resulting in a
personal injury.
When building the foundation, give full attention to the floor strength, drain water
disposal <during operation, drain water flows out of the unit>, and piping and wiring routes.
Down piping and down wiring precautions
When down piping and down wiring are performed, be sure that foundation and
base work does not block the base through holes. When down piping is performed,
make the foundation at least 100 mm high so that the piping can pass under the
bottom of the unit.
2 Commercially available piping often contains dust and other materials. Always
blow it clean with a dry inert gas.
3 Use care to prevent dust, water or other contaminants from entering the piping
during installation.
4 Reduce the number of bending portions as much as possible, and make bend-
ing radius as big as possible.
5 Always observe the restrictions on the refrigerant piping (such as rated length,
the difference between high/low pressures, and piping diameter). Failure to do
so can result in equipment failure or a decline in heating/cooling performance.
6 The City Multi Series Y will stop due to an abnormality due to excessive or
insufficient coolant. At such a time, always properly charge the unit. When
servicing, always check the notes concerning pipe length and amount of additional refrigerant at both locations, the refrigerant volume calculation table on
the back of the service panel and the additional refrigerant section on the labels for the combined number of indoor units.
7 Use liquid refrigerant to fill the system.
8 Never use refrigerant to perform an air purge. Always evacuate using a vacuum
pump.
7
INL
PGRRUTR
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