Mitsubishi PUHY-YSMF-B Installation Manual

Air-Conditioners OUTDOOR UNIT

PUHY-YSMF-B

FOR INSTALLER FÜR INSTALLATEURE POUR L’INSTALLATEUR VOOR DE INSTALLATEUR PER L’INSTALLATORE

INSTALLATION MANUAL

For safe and correct use, please read this installation manual thoroughly before installing the air-conditioner unit. ∗ Remote controller (PAR-F25MA) is available as an optional remote controller.

INSTALLATIONSHANDBUCH

Zum sicheren und ordnungsgemäßen Gebrauch der Klimageräte das Installationshandbuch gründlich durchlesen. ∗ Fernbedienung (PAR-F25MA) ist als Zubehör wahlweise erhältlich.

ENGLISH

DEUTSCH

FRANÇAIS

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. ∗ La télécommande (PAR-F25MA) est disponible en option.

INSTALLATIEHANDLEIDING

Voor een veilig en juist gebruik moet u deze installatiehandleiding grondig doorlezen voordat u de airconditioner installeert. ∗ De afstandsbedieningseenheid (PAR-F25MA) is verkrijgbaar als een optioneel toe te voegen afstandsbediening.

MANUALE DI INSTALLAZIONE

Per un uso sicuro e corretto, leggere attentamente questo manuale di installazione prima di installare il condizionatore d’aria. ∗ Il comando a distanza (modello PAR-F25MA) disponibile in opzione.

NEDERLANDS

ITALIANO

Contents

1. Safety precautions ...................................................................... 3

1.1. Before installation and electric work.............................3

1.2. Before getting installed.................................................3

1.3. Before getting installed (moved) - electrical work ......... 4

1.4. Before starting the test run ........................................... 4

2. Combination with indoor units..................................................... 5

3. Confirmation of parts attached ................................................... 5

4. Outdoor unit configuration .......................................................... 6

5. Selection of installation site ........................................................ 6

6. Space required around unit ........................................................ 7

6.1. Individual installation .................................................... 7

6.2. Collective installation and continuous installation......... 8

7. Lifting method and weight of product.......................................... 8

8. Installation of unit........................................................................ 9

8.1. Location of anchor bolt ................................................. 9

8.2. Installation .................................................................... 9

8.3. Connecting direction for refrigerant piping.................. 10

8.4. Noise level.................................................................. 10

9. Caution for snow and seasonal wind ........................................ 11

ENGLISH

9.1. Snow and seasonal wind............................................ 11

9.2. Countermeasure to seasonal wind............................. 11

10. Refrigerant piping installation.................................................. 12

10.1. Areas of caution ......................................................... 12

10.2. Refrigerant piping system........................................... 13

10.3. Precautions concerning piping connection and valve

operation .................................................................... 15

10.4. Oil balance pipe connection method .......................... 18

10.5. Distributor (gas) connection method .......................... 19

10.6. How to install branch pipe .......................................... 20

10.7. Airtight test and evacuation........................................ 21

10.8. Thermal insulation of refrigerant piping ...................... 22

11. Electrical work ......................................................................... 24

11.1. Caution....................................................................... 24

11.2. Control box and connecting position of wiring ............ 25

11.3. Wiring transmission cables......................................... 27

11.4. Wiring of main power supply and equipment

capacity ...................................................................... 33

12. Test run.................................................................................... 34

12.1. Checking before getting test run................................. 34

12.2. Test run method.......................................................... 34

12.3. How to cope with test run abnormality ....................... 35

12.4. Coping with remote controller abnormality ................. 37

12.5. The following phenomena do not represent

abnormality (emergency)............................................ 38

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” pro vide very important points

regarding 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. : Indicates that caution should be taken with rotating parts. (This

symbol is displayed on the main unit label.) <Color: Yellow>

: Indicates that the main switch must be turned off before servicing.

(This symbol is displayed on the main unit label.) <Color: Blue>

: Beware of electric shock (This symbol is displayed on the main

unit label.) <Color: Yellow>

: Beware of hot surface (This symbol is display ed on the main unit

label.) <Color: Yellow>

: Please pay attention to electric shock fully because this is

ELV

not Safety Extra Low-Voltage (SELV) circuit. And at servicing, please shut down the power supply for both of Indoor Unit and Outdoor Unit.

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 ma y result in water leakage, elec-

tric shock, or fire.

• Install the air 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 gener ate heat and cause

a fire.

• Prepare for typhoons and other strong winds and earthquakes and install the unit at the specified place.

- Improper installation may cause the unit to topple and result in in-

jury.

• Always use an air cleaner, humidifier, electric heater, 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.

- If the power source capacity is inadequate or electric work is per-

formed improperly, electric shock and fire may result.

• Securely install the cover of control box and the panel.

- If the cover and panel are 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 the it with a refrigerant different from the refrigerant (R22) specified on the unit.

- If a different refrigerant or air is mixed with the original refrigerant,

the refrigerant 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 even 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 de vice 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 a special attention to the place, such as a basement, etc. where refrigeration gas can stay, since refrigeration is heavier than the air.

1.2. Before getting installed

Caution:

• Do not install the unit where combustible gas may leak.

- 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.

- Oil, steam, sulfuric smoke, etc. can significantly reduce the per-

formance 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.

- The inverter equipment, private power generator, high-frequency

medical equipment, or radio communication equipment may cause the air conditioner to operate erroneously , or f ail 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.

- 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.

ENGLISH

1.3. Before getting installed (moved) electrical work

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 cord: 4103), but the reverse phase of L lines and N line can be not be detected.

- The some electric parts should be dameged when power is sup-

plied under the miss wiring.

• Install the power cable so that tension is not applied to the cable.

- T ension ma y cause the cable to break and generate heat and cause

a fire.

• Install an leak circuit breaker, as required.

- If an 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 or a steel or copper

wire may result in a general unit failure or fire.

• Do not wash the air conditioner units.

ENGLISH

- Washing them may cause an electric shock.

• Be careful that the installation base is not damaged by long use.

- If the damage is left uncorrected, the unit may fall and cause per-

sonal 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 and damage to

furniture and other possessions.

• Be very careful about product transportation.

- Only one person should not carry the product if it weighs more than

20 kg.

- Some products use PP bands for packaging. Do not use any PP

bands for a means of transportation. It is dangerous.

- Do not touch the heat exchanger fins. Doing so may cut your fin-

gers.

- When transporting the outdoor unit, suspend it at the specified po-

sitions 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 aw ay plastic packaging bags so that children

will not play with them. If children pla y with a plastic bag which w as not torn apart, they face the risk of suffocation.

1, L2, L3) can be detected (Error

1.4. 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 severe damage to internal parts. Keep the pow er 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 are

may be hot and may be 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.

- Alwa ys wait at least five minutes before turning off the power. Oth-

erwise, water leakage and trouble may occur.

2. Combination with indoor units

The indoor units connectable to this unit are shown below.

Outdoor unit model

name

Note:

1. The total capacity of connected indoor unit models represents the total sum of the figures expressed in the indoor model name.

2. Combinations in which the total capacity of the connected indoor units exceeds the capacity of the outdoor unit will reduce the capacity of each indoor unit below the rated capacity during simultaneous operation. Therefore, if circumstances allows, combine indoor units within the capacity of the outdoor unit.

3. A transmission booster (RP) is required when the number of connected indoor unit models in a cooling system exceeds the number of models specified in the chart below. * The maximum number of units that can be controlled is determined by the indoor unit model, the type of remote controller and their

capabilities.

(*1) Capability of the connected indoor units

*1 If even one unit that is higher than 200 exists in the cooling system, the maximum capacity will be “200 or higher”.

Total capacity of

connected indoor unit

models

300 to 780PUHY-600

325 to 845PUHY-650

350 to 910PUHY-700

375 to 975PUHY-750

Number of connected indoor units that can be connected without a RP

200 or lower

200 or higher

Quantity of connectable

indoor unit

PMFY-P25 · 32 · 40 · 63 VBM PLFY- P32· 40 · 50 · 63 · 80 · 100 · 125 VKM PLFY- P20· 25 · 32 · 40 · 50 · 63 · 80 · 100 · 125 VLMD PEFY- P20· 25 · 32 VML PEFY- P40· 50 · 63 · 71 · 80 · 100 · 125 · 140 · 200 · 250 VMH

3 to 32

Remote controller type

The number of indoor units and the total number of remote controllers is displayed within the parenthesis ( ).

PCFY-P40· 63 · 100 · 125 VGM PKFY-P20· 25 VAM PKFY-P32· 40 · 50 VGM PFFY- P20· 25 · 32 · 40 · 50 · 63 VLEM PFFY- P20 · 25 · 32 · 40 · 50 · 63 VLRM PDFY-P20· 25 · 32 · 40 · 50 · 63 · 71 · 80 · 100 · 125 VM

Model name of connectable indoor unit

Remote controller PAR-F 25MA

Prior to Ver. E After Ver. F

16 (32) 20 (40) 16 (32) 16 (32)

ENGLISH

3. Confirmation of parts attached

This outdoor unit is attached with the parts below. Please check the quantity for each item.

Name 1 Conduit mounting plate 2 Conduit mounting plate 3 Conduit mounting plate 4 Tapping screw M4 × 12

Shape

PUHN-200YMF-B PUHN-250YMF-B

Model name

Name 5 Oil balance pipe 6 Connecting pipe 7 Packing 8 Seal

Shape

PUHN-200YMF-B PUHN-250YMF-B

Model name

ø40

1114

1112

ø33

ø27

insideø23 outsideø35

inside ø23, outside ø35

*6 Connecting pipe is fixed with the unit.

4. Outdoor unit configuration

The unit (PUHY-600/650/700/750YSMF-B) consists of a combination of variable capacity units (PUHY-400/500YMF-B) and constant capacity units (PUHN-200/250YMF-B). A CMC-30A (optional) is required when using a combination of these units.

Super Y Variable capacity unit Constant capacity unit PUHY-600YSMF-B PUHY-650YSMF-B PUHN-250YMF-B PUHY-700YSMF-B PUHY-750YSMF-B PUHN-250YMF-B

CMC-30A (optional)

Name 1 Distributer (gas) 2 Oil balance pipe 2 3 Distributer (liquid) 4 Connecting pipe

Shape

CMC-30A 1 1 1 1

Model name

Name 5 Connecting pipe 6 Connecting pipe 7 Connecting pipe 8 Elbow

PUHY-400YMF-B

PUHY-500YMF-B

PUHN-200YMF-B

ENGLISH

Model name

Shape

CMC-30A 1 1 1 2

5. Selection of installation site

Select space for installing outdoor unit, which will meet the following conditions:

• no direct thermal radiation from other heat sources

• no possibility of annoying neighbors by noise from unit

• no exposition to strong wind

• with strength which bears weight of unit

• note that drain flows out of unit when heating

• with space for air passage and service work shown below

Because of the possibility of fire, do not install unit to the space where generation, inflow, stagnation, and leak of combustible gas is expected.

• Avoid unit installation in a place where acidic solution and spra y (sulfur) are often used.

• When having cooling operation at an outside air temperature of below 10°C, in order to obtain steady operation of unit, select an installation site not exposed directly to rain and snow, or install air outlet and inlet ducts. (Refer to Page 11.) Install the outdoor unit at the same position on the same floor, or above, the indoor unit. (See the figure at the right.)

• Do not use unit in any special environment where oil, steam and sulfuric gas exist.

Installation restriction on outdoor unit when cooling operation is performed when the outdoor air temperature is 10°C or lower.

(Same floor as indoor unit, or floor above)

A 4 m or less

6. Space required around unit

650

325

6.1. Individual installation

Basic space required

A space of at least 250 mm is necessary at the back for inlet air. Taking servicing, etc. from the rear into account, a space of about 450 mm should be provided, the same as at the front.

A 250 mm or more B 450 mm or more C Front (outside of machine room) D Top discharge (open in principle) E Front inlet (open in principle) F Rear inlet (open in principle)

When unit is surrounded by walls

A L

1 or more

B L

2 or more

C Front D Front panel E Rear panel

Note:

• Wall heights (H) of the front and the back sides shall be within height of front panel and rear panel.

• If the panel height is exceeded, add the “h” dimension of the figure above to L

1 L2

1 and L2 in the table above.

ENGLISH

450 250

When inlet air enters from right and left sides of unit

A L1 or more B L

2 or more

C Front D No restrictions on wall height (left and right)

Note:

• Wall heights (H) of the front and the back sides shall be within overall height of unit.

• When the total height is exceeded, add the “h” dimension of the figure above to L1 and L2 in the table above.

L1 L2

450 250

Example: When h is 100

The L1 dimension becomes 450 + 100 = 550 mm.

When there is an obstruction above the unit

When there is little space

up to an obstruction

A 45° or more B 300 mm or more C Front D 1000 mm or more E Air outlet guide (procured at the site) F Rear

6.2. Collective installation and continu-

D D

CCCC

FEFFF

ous installation

Space required for collective installation and continuous installation: When installing several units, leave the space between each block as shown below considering passage for air and people.

ENGLISH

A (Must be open) B Wall height (H) C Front D 1000 mm or more E 250 mm or more F 450 mm or more G 900 mm or more

Note:

• Open in the two directions.

• In case wall height (H) exceeds overall height of unit, add “h”

dimension (h = wall height <H> – overall height of unit) to marked dimension.

• If there is a wall at both the front and the rear of the unit, install up to three units consecutively in the side direction and provide a space of 1000 mm or more as inlet space/passage space for each three units.

7. Lifting method and weight of product

• When carrying the unit suspended, pass the ropes under the unit and use the two suspension points each at the front and rear.

• Always lift the unit with ropes attached at four points so that impact is not applied to the unit.

• Attach the ropes to the unit at an angle of 40° or less.

• Use two ropes at least A m long.

A 40° or less B Rope suspension part

7 ··· PUHN-200/250YMF-B

A =

8 ··· PUHY-400/500YMF-B

Dangerous!

Weight of product:

PUHY-400 PUHY-500 PUHN-200 PUHN-250

432 kg 472 kg 240 kg 255 kg

Caution:

Be very careful to carry product.

- Do not have only one person to carry product if it is 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 y our bare hands. Otherwise you may get a cut in your hands.

- Tear plastic packaging bag and scrap it so that children cannot play with it. Otherwise plastic pac kaging bag may suffocate children to death.

- When carrying in outdoor unit, be sure to support it at four points. Carrying in and lifting with 3-point support may make outdoor unit unstable, resulting in a fall of it.

8. Installation of unit

8.1. Location of anchor bolt

Mount the constant capacity unit on the left and variable capacity unit on the right of the same frame (as seen from the front of the unit). Allow

10 mm of clearance between the units.

• Individual installation (Unit: mm)

Constant capacity unit Variable capacity unit

Constant capacity unit

880±5

Variable capacity unit

Service side

• Example of collective installation

Constant capacity unit Variable capacity unit Constant capacity unit Variable capacity unit

Constant capacity unit

880±5

Variable capacity unit

780±2780±2440560±2

8.2. Installation

• Fix unit tightly with bolts as shown below so that unit will not fall down due to earthquake or gust.

• Use concrete or angle 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.).

Constant capacity unit

440 780±2780±2440560±2

Service side

Variable capacity unit

1010

For collective installation, provide a 10 mm gap between units.

ENGLISH

880±5

A Be sure that the cor ners are firmly seated. If the corners are not firmly

seated, the installation feet may be bent

B M10 anchor bolt procured at the site C Corner is not seated. D Unit

(Provide ample vibrationproofing between the unit and the foundation by using cushion pads, cushion frame, etc.)

E Piping and wiring space (bottom piping, bottom wiring) F Concrete foundation

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 str ong 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 150 mm high so that the piping can pass under the bottom of the unit.

<PUHN-200/250YMF-B>

8073

ENGLISH

584

160

A Bottom piping through hole B (bolt hole) C (bolt hole for old models) D (unit width) E (unit depth) F Bottom wiring through hole G (bolt hole for packing)

560 760 990

130

B G D

194

121

840E880

910

8.3. Connecting direction for refrigerant piping

Two connecting directions are available f or refrigerant piping of the outdoor unit, bottom piping and front piping,as shown below:

<PUHY-400/500YMF-B>

694

150230

111

8.4. Noise level

788280

840E880

910

73 90 80

780

1760 1990

G D

780

PUHY-400 PUHY-500 PUHN-200 PUHN-250

60/61 dB (A-weighted)

56 dB (A-weighted) 57 dB (A-weighted)

(50/60Hz)

A Knock-out hole B Bottom piping C Front piping D Connect piping (to constant capacity unit)

Note: In the case of bottom piping, build a 100 mm or higher foundation so that piping will go through the bottom of the unit.

A Front B Measuring point

Measuring location: a room free from echoes and reverberations

9. Caution for snow and seasonal wind

In cold and/or snowy areas, sufficient countermeasures to wind and snow damages should be taken for operating unit in normal and good condition in winter time. Ev en in the other areas, full consider ation is required for installation of unit in order to prevent abnormal operations caused by seasonal wind or snow. When rain and snow directly fall on unit in

the case of air-conditioning operations in 10 or less degrees centigrade outdoor air, mount inlet and outlet ducts on unit for assuring stable operations.

9.1. Snow and seasonal wind

■ Prevention of wind and snow damages in cold or snowy areas:

Refer to the figure of snow hood shown below:

• Snow hood

<PUHY-400/500YMF-B>

1093

1888

Note:

1. Height of frame base for snow damage prevention (H) shall be twice as high as expected snowfall. Width of frame base shall not exceed that of the unit. The frame base shall be made of angle steel, etc., and designed so that sno w and wind slip through the structure. (If frame base is too wide, snow will be accumulated on it.)

2. Install unit so that seasonal wind will not directly lash against openings of inlet and outlet ducts.

3. Build frame base at customer referring to this figure. Material : Galvanized steel plate 1.2T Painting: Overall painting with polyester powder Color : Munsell 5Y8/1 (same as that of unit)

4. When the unit is used in a cold region and the heating operation is continuously performed for a long time when the outside air temperature is below freezing, install a heater to the unit base or take other appropriate measures to prevent water from freezing on the base.

<PUHN-200/250YMF-B>

1093

888

ENGLISH

1145

A Outlet B Inlet

500(840)500

(670) 821 903

(1990)

1145

500(840)500

(670) 821 903

9.2. Countermeasure to seasonal wind

Referring to the figure shown below, take appropriate measures which will suit the actual situation of the place for installation.

(990)

A Seasonal wind

10. 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, oil balance piping. Note that the branched sections are brazed.

Warning:

Always use extreme care to prevent the refrigerant gas (R22) from leaking while using fire or flame. If the refrigerant gas comes in contact with the flame from any source, such as a gas sto ve, it breaks do wn and generates a poisonous gas which can cause gas poisoning. Ne ver weld in an unventilated room. Al wa ys conduct an inspection f or gas leakage after installation of the refrigerant piping has been completed.

10.1. Areas of caution

1 Use the following materials for refrigeration piping.

• Material: Seamless phosphorous deoxidized copper pipe, C1220T-OL or C1220T-O (Note: C1220T-OL is preferred.)

• Size: Refer to pages 13 to 14.

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 bending radius as big as possible. 5 Always use the branch piping set shown below , which are sold separ ately. This unit requires a CMC-30A (optional).

Branch pipe set name

Line branching Header branching

Total of units down-

ENGLISH

stream less than 160

CMY-Y102S-F CMY-Y102L-F CMY-Y202-F CMY-Y302-F CMY-Y104-E CMY-Y107-E CMY-Y1010-E

Total of units down-

stream 161 to 330

Total of units down-

stream 331 to 630

Total of units down-

stream more than 631

4 branching 7 branching 10 branching

6 If the diameters of the branch piping of the designated refrigerant piping differs, use a pipe cutter to cut the connecting section and then use an

adapter for connecting different diameters to connect the piping.

7 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.

8 A second branch cannot be made after a header branch. (These are shown by ×.)

A To outdoor unit B Capped piping

9 Always use good-quality materials for brazing. 0 The City Multi Series Super Y will stop due an abnormality due to excessive or insufficient coolant. At such a time, alw a ys 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. (Refer to pages 13 to 14.)

A Never perform a pump down. This will damage the compressor. B Never use refrigerant to perform an air purge. Always evacuate using a vacuum pump. C Always insulate the piping properly. Insufficient insulation will result in a decline in heating/cooling perf ormance, water drops from condensation and

other such problems. (Refer to pages 22 to

D When connecting the refrigerant piping, make sure the ball valve of the outdoor unit is completely closed (the factory setting) and do not operate it

until the refrigerant piping for the outdoor and indoor units has been connected, a refrigerant leakage test has been performed and the evacuation process has been completed.

E Always use a non-oxidizing brazing material for brazing the parts. If a non-oxidizing br azing material is not used, it could cause clogging or damage

to the compressor unit. (Details of the piping connections and valve operation can be found on pages 15 to 19.)

Warning:

When installing and moving the air conditioner to another site, do not charge the it with a refrigerant different from the refrigerant (R22) specified on the unit.

- If a different refrigerant or air is mixed with the original refrigerant, the refrigerant cycle may malfunction and the unit may be damaged.

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