Mitsumi electronic PQHY-P7296TGMU-A User Manual

Air-Conditioners For Building Application
HEAT SOURCE UNIT

PQHY-P72·96TGMU-A

For use with R410A

INSTALLATION MANUAL

For safe and correct use, please read this installation manual thoroughly before installing the air-conditioner unit.

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.

GB

F

5

[Fig. 5.0.1]

>

8 m

=

[26 ft]

6

6.1

[Fig. 6.1.1]

45

<

40°

=

>

8 m

=

[26 ft]

[1-25/32]

990 [39]

900 [35-7/16]

B

A

550 [21-21/32]

570 [22-15/32]

602 [23-23/32]

7

[Fig. 7.1.1]

[Fig. 7.4.1]

Side piping

Top piping

7.1

D

B

A

C

F

G

A

G

C

B

F

A Water circulation pipe
B Close valve
C Close valve
D Water outlet

7.4

A Heat source unit
B 4-ø14 [9/16] (Anchoring hole)
C (Top view)

C

16

[21/32]

[Fig. 6.1.2]

E

D Anti-vibration pad etc.
E Concrete base

D

E

6.2

E

H

D

H

E Refrigerant piping
F Y-type strainer
G Water inlet
H Drain pipe

[Fig. 6.2.1]

550

600

A Piping space (for side piping)
B Heat source unit
C Service space (front side)
D (Top view)

[Fig. 6.2.2]

[21-21/32]

[23-5/8]

A

400

[15-3/4] 990 [39]

D

400

[15-3/4]

990 [39]

E

B

C

400

[15-3/4]

TB8

3
4

A Short-circuit wire (Connected before delivery from manufacturer)
B Pump interlock circuit connection

A

63PW

B

2

F

E Piping space (for top piping)
F Piping space (for side piping)
G Heat source unit
H (Front view)

G

H

8

A

B

1

3

[Fig. 8.2.1]

8.2

A

A

B C D

a

B

b c d

C

CCC

1

234

e

A (Unit: mm [in])

Å Heat source model

P72
P96

ı Liquid pipe

ø9.52 [3/8]

* ø9.52 [3/8]

Ç Gas pipe
ø19.05 [3/4]

ø22.2 [7/8]

* ø12.7 [1/2] for over 90m [295 ft]

B, C, D (Unit: mm [in])

Î Total capacity of indoor units

~ 54
55 ~ 72
73 ~

ı Liquid pipe

ø9.52 [3/8]
ø9.52 [3/8]
ø9.52 [3/8]

Ç Gas pipe
ø15.88 [5/8]
ø19.05 [3/4]

ø22.2 [7/8]

a, b, c, d, e (Unit: mm [in])

‰ Model number

06,08,12,15,18

24,27,30,36,48,54

72
96

ı Liquid pipe

ø6.35 [1/4]
ø9.52 [3/8]
ø9.52 [3/8]
ø9.52 [3/8]

Ç Gas pipe

ø12.7[1/2]
ø15.88 [5/8]
ø19.05 [3/4]

ø22.2 [7/8]

A

C

5

Ï Downstream unit model total

Ó 4-Branching header

(Downstream unit

model total

CMY-Y104-G

A

B

a

1

~ 72

73 ~ 400

<
=

200)

b

c d e

CC

2

CC

345

¬ 8-Branching header

(Downstream unit

model total

CMY-Y108-G

D

C

<
=

400)

A Heat source unit
B First branch
C Indoor unit
D Cap

Ì Branch kit model

CMY-Y102S-G
CMY-Y102L-G

Ô

10-Branching header

(Downstream unit

model total

CMY-Y1010-G

<
=

650)

9

[Fig. 9.2.1]

[Fig. 9.2.3]

A Close-packed packing
B Hollow packing

9.2

[Fig. 9.2.2]

<A> [Ball valve (Low press. side/flanged type)] <B> [Ball valve (High press. side/flared type)]

<C> This figure shows the valve

in the fully open state.

E

B

OS

SO

A

C

D

J

K

A Valve stem
B Stopper pin
C Packing (Accessory)
D Connecting pipe (Accessory)
E Open (Operate slowly)
F Cap
G Service port

E

G

F

H

I

H Flare nut
I ø9.52 [3/8] (PQHY-P72)

ø9.52 [3/8] (PQHY-P96)

J ø19.05 [3/4] (PQHY-P72)

ø22.2 [7/8] (PQHY-P96)

K Field piping

3

C

A

B

D

E

9.3

[Fig. 9.3.1]

A

C

[Fig. 9.3.3]

G

H

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 Heat source unit
J Service port

F

B

B

C

LO

D

B In case of the cylinder having no syphon pipe.

HI

E

I

[Fig. 9.3.2]

9.4

D

EN

F

A

LO

B

HI

C

O

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 R410A cylinder
L Scale
M Vacuum pump
N To indoor unit
O Heat source unit

[Fig. 9.4.1]

A Steel wire B Piping
C Asphaltic oily mastic or asphalt
D Heat insulation material A
E Outer covering B

[Fig. 9.4.4]

<A> Inner wall (concealed)

A B

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

<B> Outer wall

D

C

A B

A

B

C

D

E

E

B

E

A

D

A Liquid pipe B Gas pipe
C Electric wire D Finishing tape
E Insulator

<C> Outer wall (exposed)

E

<D> Floor (waterproofing)

B

I

[Fig. 9.4.3][Fig. 9.4.2]

<E> Roof pipe shaft

D

F

G

<F> Penetrating portion on fire

limit and boundary wall

D

I

J

B

G

B

H

F

A

1m1m

[3.28 ft][3.28 ft]

10

10.2

[Fig. 10.2.1]

A : Power source

L1 L2 L3 M1M2 M1M2 S

TB1

AB

TB3 TB7

C

B : Transmission line
C : Ground screw

4

10.3

BA

C

~208–230 V

BA

~208–230 V

E EDE E

[Fig. 10.3.1]

<A> Change the jumper connec-

tor from CN41 to CN40

<B> SW2-1:ON

<C> Keep the jumper connector

on CN41

<B> SW2-1:ON

[Fig. 10.3.2]

<A> Change the jumper connec-

tor from CN41 to CN40

<B> SW2-1:ON

<C> Keep the jumper connector

on CN41

<B> SW2-1:ON

A : Group 1
B : Group 3
C : Group 5
D : Shielded wire
E : Sub remote

controller

( ) Address

L1

OC

CN40

(51)

TB3
M1 M2

M1 M2 S

TB7

D

L2

OC

CN40

(52)

TB3

M1 M2

M1 M2 S

TB7

System

L6

controller

M1M2S

A B C

IC

(01)

TB5

M1 M2 S

r1

AB AB AB

(101)

RC

L3

IC

(02)

TB5

M1 M2 S

IC

(04)

TB5

M1 M2 S

IC

(03)

TB5

M1 M2 S

L5

r4

AB

(103)

RC

IC

(05)

TB5

M1 M2 S

r3

r2

(105)

(155)

RC

M1 M2 S

E

IC

(07)

TB5

L4

IC

(06)

TB5

M1 M2 S

RC

L1

OC

CN40

(51)

TB3

M1 M2

M1 M2 S

TB7

D

L2

OC

CN40

(52)

TB3

M1 M2

M1 M2 S

TB7

System

L6

controller

M1M2

S

A B C

IC

(01)

TB5 TB15

M1 M2 12S

c2

MA

L3

IC

(02)

TB15

TB5

12

M1 M2 S

IC

(04)

TB5

M1 M2 S

c1

IC

(03)

TB5

TB15

M1 M2 S

12

AB

IC

(05)

TB15

TB5

12

M1 M2 S

ABABAB

c2

MAMAMA

E

L4

IC

(07)

TB15

TB5

12

M1 M2 S

IC

(06)

c2

TB15

TB5

12

M1 M2 S

c1

c4

c3

c1

[Fig. 10.4.1]

A : Switch (breakers for wiring and current leakage)
B : Breakers for current leakage
C : Heat source unit
D : Pull box
E : Indoor unit

10.4

5

Contents

1. Safety precautions ...................................................................................... 6

1.1. Before installation and electric work .......................................... 6

1.2. Precautions for devices that use R410A refrigerant .................. 6

1.3. Before getting installed .............................................................. 7

1.4. Before installation electrical work .............................................. 7

1.5. Before starting the test run ........................................................ 7

2. About the product ....................................................................................... 7

3. Specifications .............................................................................................. 7

4. Confirmation of parts attached ................................................................... 8

5. Lifting method ............................................................................................. 8

6. Installation of unit and service space .......................................................... 8

6.1. Installation ................................................................................. 8

6.2. Service space ............................................................................ 8

7. Water pipe installation ................................................................................. 8

7.1. Precautions during installation .................................................. 8

7.2. Insulation installation ................................................................. 8

7.3. Water processing and water quality control............................... 8

7.4. Pump interlock........................................................................... 9

1. Safety precautions

GB

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-

D

garding safety. Make sure you follow them.

Symbols used in the text

FINL EPGRRUTR

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 in 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 rain and other moisture and earthquakes and install the unit
at the specified place.

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

• Always use an filter and other accessories specified b y 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.

• 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.

6

8. Refrigerant piping installation ..................................................................... 9

8.1. Caution ...................................................................................... 9

8.2. Refrigerant piping system .......................................................... 9

9. Additional refrigerant charge ..................................................................... 10

9.1. Calculation of additional refrigerant charge ............................. 10

9.2. Precautions concerning piping connection and

valve operation ........................................................................ 10

9.3. Airtight test, evacuation, and refrigerant charging ................... 11

9.4. Thermal insulation of refrigerant piping ................................... 11

10. Wiring ........................................................................................................ 12

10.1. Caution .................................................................................... 12

10.2. Control box and connecting position of wiring ......................... 12

10.3. Wiring transmission cables ...................................................... 12

10.4. Wiring of main power supply and equipment capacity ............ 14

11. Test run ..................................................................................................... 14

11.1. The following phenomena do not represent trouble

(emergency) ............................................................................ 14

12.Information on rating plate ......................................................................... 14

- If the power source capacity is inadequate or electric work is performed im­properly, electric shock and fire may result.

• Securely install the heat source unit terminal cover (panel).

- If the terminal cover (panel) is not installed properly, dust or water may enter
the heat source 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 (R410A) 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
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 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 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. Precautions for devices that use R410A

refrigerant

Caution:

• Do not use the 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.

- R410A is a high-pressure refrigerant and can cause the existing piping to

burst.

• 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 an y 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 refriger­ant in the cylinder will change and performance may drop.

• Do not use a refrigerant other than R410A.

- If another refrigerant (R22, etc.) is mixed with R410A, 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 c heck valve,
refrigerant charge base, refrigerant recovery equipment)

- If the conventional refrigerant and refrigerator oil are mixed in the R410A,

the refrigerant may deteriorated.

- If water is mixed in the R410A, the refrigerator oil may deteriorate.

- Since R410A 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 in the refrigerant cycle, the refrigerant may deteriorate.

1.3. 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 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.

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

equipment, 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.

- 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 heat source unit, as required.

1.4. Before installation electrical work

Warning

When installing or relocating the unit, make sure that no substance other
than the specified refrigerant (R410A) enters the refrigerant circuit.
Any presence of foreign substance such as air can cause abnormal pres­sure rise or explosion.

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.

2. About the product

• The reverse phase of L lines (L1, L2, L3) can be detected (Error cord: 4103),
but the reverse phase of L lines and N line can be not be detected.

- The some electric parts should be damaged when power is supplied under

the 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.

• 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 or 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 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 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

[45 LBS].

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

means of transportation. It is dangerous.

- When transporting the heat source unit, support it at the specified positions

on the unit base. Also support the heat source unit at four points so that it
cannot slip side ways.

• 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.

- Star ting operation immediately after turning on the main power switch can

result in severe 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 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.

- 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

compressor is operating.

GB

D

FINL EPGRRUTR

• This unit uses R410A-type refrigerant

• Piping for systems using R410A may be different from that for systems using
conventional refrigerant because the design pressure in systems using R410A
is higher. Refer to Data Book for more information.

• Some of the tools and equipment used for installation with systems that use
other types of refrigerant cannot be used with the systems using R410A. Refer
to Data Book for more information.

3. Specifications

Model
Noise level
Net weight
Allowable pressure
Refrigerant

Indoor units

Operation temperature
Maximum water pressure
Rated water volume
Allowable water volume

Total capacity
Model / Quantity

PQHY-P72TGMU-A PQHY-P96TGMU-A

46 dB <A> 47 dB <A>

266 kg [588 LBS] 269 kg [594 LBS]

R410A: 7.0 kg [15 LBS 7 oz] R410A: 8.0 kg [17 LBS 11 oz]

P06 ~ P96 / 1 ~ 13 P06 ~ P96 / 1 ~ 16

3

/h [1204 G/h] 5.76 m3/h [1521 G/h]

4.56 m

3

3.9 ~ 6.8 m

/h [1030 ~ 1795 G/h] 4.5 ~ 7.2 m3/h [1181 ~ 1901 G/h]

• Do not use the existing piping, as it contains chlorine, which is found in con­ventional refrigerating machine oil and refrigerant. This chlorine will deteriorate
the refrigerant machine oil in the new equipment. The existing piping must not
be used as the design pressure in systems using R410A is higher than that in
the systems using other types of refrigerant and the existing pipes may burst.

HP: 4.15 MPa [601 psi], LP: 2.21 MPa [320 psi]

50 ~ 130 %

Water temperature: 10˚C ~ 45˚C [50˚F ~ 113˚F]

1.0 MPa [145 psi]

7

4. Confirmation of parts attached

1 Connecting pipe × 1 (Connecting pipe is fixed with the unit.) 2 Packing (inside ø23 [29/32 in], outside ø35 [1-13/32 in]) × 1
3 Bushing × 2

5. Lifting method

[Fig. 5.0.1] (P.2)

Caution:

Be very careful when carrying the product.

- Do not have only one person to carry product if it is more than 20 kg [46 LBS].

- PP bands are used to pack some products. Do not use them as a mean for transportation because they are dangerous.

- 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 the heat source unit, be sure to support it at four points. Carrying with 3-point support may make the heat source unit unstable, resulting in it falling.

6. Installation of unit and service space

6.1. Installation

• Using the anchoring holes shown below, firmly bolt the unit to the base.

GB

[Fig. 6.1.1] (P.2)

A Heat source unit B 4-ø14 [9/16] (Anchoring hole)
C (Top view)

Bases and anti-vibration

D

• Be sure to install unit in a place strong enough to withstand its weight. If the
base is unstable, reinforce with a concrete base.

• The unit must be anchored on a level surface. Use a level to check after
installation.

• Anti-vibration pads must be placed under the base of the unit.

FINL EPGRRUTR

• If the unit is installed near a room where noise is a problem, using an anti­vibration stand on the base of the unit is recommended.

[Fig. 6.1.2] (P.2)

D Anti-vibration pad etc. E Concrete base

7. Water pipe installation

• City Multi WY Series pipes are similar to other air-conditioning pipes, however,
please observe the following precautions during installation.

7.1. Precautions during installation

• Use the reverse-return method to insure proper pipe resistance to each unit.

• To insure easy maintenance, inspection, and replacement of the unit, use a
proper joint, valve, etc. on the water intake and outlet port. In addition, be sure
to install a strainer on the water intake pipe. (In order to maintain the heat
source unit, a strainer on the circulating water inlet is necessary.)
* An example of the heat source unit installation is shown in the diagram be-

low.

• Install a suitable air vent on the water pipe. After sending water through the
pipe, be sure to vent the excess air.

• Compressed water may form in the low-temperature sections of heat source
unit. Use a drainage pipe connected to the drain valve at the base of the unit to
drain the water.

• There is a water vent plug in the center of the heat exchanger water inlet head
at the middle of the unit. Use this for maintenance, etc.
In addition, do not allow any of the unit’s electrical parts (such as the solenoid
valve coil or compressor power supply) to become wet.

• Install a back flow-prevention valve on the pump and a flexible joint to prevent
excess vibration.

• Use a sleeve to protect the pipes where they go through a wall.

• Use metal fittings to secure the pipes, and install them so that they have maxi­mum protection against breakage and bending.

• Do not confuse the water intake and outlet valves.

• This unit doesn’t have any heater to prevent freezing within tubes. When the
water flow is stopped on low ambient, take out the water from tubes.

• The unused knockout holes should be closed and the opening of refrigerant
pipes, water pipes, power source and transmission wires should be filled with
putty and so on to prevent from rain. (field construction)

Example of heat source unit installation (using left piping)

8

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 earthquake.
Any installation deficiency may cause unit to fall down, resulting in a
personal injury.

6.2. Service space

• Please allow for the following service spaces after installation.
(All servicing can be performed from the front of the unit)

[Fig. 6.2.1] (P.2)

A Piping space (for side piping) B Heat source unit
C Service space (front side) D (Top view)

[Fig. 6.2.2] (P.2)

E Piping space (for top piping) F Piping space (for side piping)
G Heat source unit H (Front view)

[Fig. 7.1.1] (P.2)

A Water circulation pipe B Close valve
C Close valve D Water outlet
E Refrigerant piping F Y-type strainer
G Water inlet H Drain pipe

7.2. Insulation installation

With City Multi WY Series piping, as long as the temperature range of the circulat­ing water is kept to average temperatures year-round (30 °C [86 °F] in the summer,
20 °C [68 °F] in the winter), there is no need to insulate or otherwise protect indoor
piping from exposure. You should use insulation in the following situations:

• Any heat source piping.

• Indoor piping in cold-weather regions where frozen pipes are a problem.

• When air coming from the outside causes condensation to form on piping.

• Any drainage piping.

7.3. Water pr ocessing and water quality con-

trol

To preserve water quality, use the closed type of cooling tower for WY. When the
circulating water quality is poor, the water heat exchanger can develop scales,
leading to a reduction in heat-exchange power and possible corrosion of the heat
exchanger. Please pay careful attention to water processing and water quality control
when installing the water circulation system.

• Removal of foreign objects or impurities within the pipes.
During installation, be careful that foreign objects, such as welding fragments,
sealant particles, or rust, do not enter the pipes.

• Water Quality Processing
1 Depending on the quality of the cold-temperature water used in the air-

conditioner, the copper piping of the heat exchanger may become corroded.
We recommend regular water quality processing.
Cold water circulation systems using open heat storage tanks are
particularly prone to corrosion.
When using an open-type heat storage tank, install a water-to-water heat
exchanger, and use a closed-loop circuit on the air conditioner side. If a
water supply tank is installed, keep contact with air to a minimum, and
keep the level of dissolved oxygen in the water no higher than 1mg/r.

2 Water quality standard

Lower mid-range

temperature water system

2-

/r)

/r)

3

/r)

2

2-

/r)

+

/r)

4

/r)

2

Recirculating

water
[20<T<60°C]
[68<T<140°F]

7.0 ~ 8.0

30 or less

[300 or less]

50 or less
50 or less

50 or less

70 or less
50 or less
30 or less

1.0 or less

1.0 or less
not to be
detected

0.3 or less

0.25 or less

0.4 or less

–

Make-up

water

7.0 ~ 8.0

30 or less

[300 or less]

50 or less
50 or less

50 or less

70 or less
50 or less
30 or less

0.3 or less

0.1 or less
not to be
detected

0.1 or less

0.3 or less

4.0 or less

Items

pH (25˚C) [77°F]
Electric conductivity

Chloride ion (mg Cl-/r)
Sulfate ion (mg SO4

Standard

Acid consumption (pH4.8)

items

Total hardness (mg CaCO
Calcium hardness (mg CaCO3/r)
Ionic silica (mg SiO

Refer-

Iron (mg Fe/r)

ence

Copper (mg Cu/r)

items

Sulfide ion (mg S

Ammonium ion (mg NH
Residual chlorine (mg Cl/r)
Free carbon dioxide (mg CO
Ryzner stability index

Reference : Guideline of Water Quality for Refrigeration and Air Conditioning

Equipment. (JRA GL02E-1994)

(mS/m) (25°C) [77°F]

(µ s/cm) (25°C) [77°F]

(mg CaCO3/r)

Tendency

Corrosive

–

8. Refrigerant piping installation

Scale-

forming

3 Please consult with a water quality control specialist about water quality

control methods and water quality calculations before using anti-corrosive
solutions for water quality management.

4 When replacing a previously installed air conditioning device (even when

only the heat exchanger is being replaced), first conduct a water quality
analysis and check for possible corrosion.
Corrosion can occur in cold-water systems even if there has been no prior
signs of corrosion.
If the water quality level has dropped, please adjust water quality suffi­ciently before replacing the unit.

7.4. Pump interlock

The heat source unit may become damaged if it is operated with no water circulat­ing through the pipes.
Be sure to interlock unit operation and the water-circuit pump. Use the terminal
blocks for interlocking (TB8-3, 4) that can be found on the unit.
In the case of a pump interlock circuit signal connection to the TB8-3, 4, remove
the short-circuit wire. Also, to prevent mistaken error detection, resulting from a
poor connection, in the pressure valve 63PW, use a low maintained current of 5mA
or less.

[Fig. 7.4.1] (P.2)

A Short-circuit wire (Connected before delivery from manufacturer)
B Pump interlock circuit connection

GB

D

Connecting the piping is a terminal-branch type in which refrigerant piping from
the heat source unit is branched at the terminal and connected to each of the
indoor units.
The method of pipe connection is as follows: flare connection for the indoor units, gas
pipes for heat source units, flare connection for P72 and brazed connection for P96 ~
P168; liquid pipes, flare connection. 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 a flame from
any source, such as a gas sto ve, 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.

8.1. Caution

This unit uses refrigerant R410A. Follow the local regulations on materials and
pipe thickness when selecting pipes.

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.

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 Either a lack or an excess of refrigerant causes the unit to make an emergency

stop. Charge the system with an appropriate amount of refrigerant. 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.

9 Always insulate the piping properly. Insufficient insulation will result in a de-

cline in heating/cooling performance, water drops from condensation and other
such problems.

0 When connecting the refrigerant piping, make sure the ball valve of the heat

source unit is completely closed (the factory setting) and do not operate it until
the refrigerant piping for the heat source and indoor units has been connected,
a refrigerant leakage test has been performed and the evacuation process has
been completed.

A Residues in commercially available antioxidants may have adverse effects on

the equipment. Braze only with non-oxide brazing material. The use of other
brazing material may result in compressor damage.
(Refer to item 9.2. for detailed information on pipe connections and valve op­erations.)

B Never perform heat source unit piping connection work when it is raining.

Warning

When installing and moving the unit, do not charge it with refrigerant other
than the refrigerant specified on the unit.

- Mixing of a different refrigerant, air, etc. may cause the refrigerant cycle to mal­function and result in severe damage.

Caution:

• Use a vacuum pump with a reverse flow check valve.

- If the vacuum pump does not have a reverse flow check valve, the vacuum
pump oil may flow back into the refrigerant cycle and cause deterioration of
the refrigerator oil and other trouble.

• Do not use the tools shown below used with conventional refrigerant.
(Gauge manifold, charge hose, gas leak detector, check v alve, refrigerant
charge base, vacuum gauge, refrigerant recovery equipment)

- Mixing of conventional refrigerant and refrigerator oil may cause the refrig-

erator oil to deteriorate.

- Mixing of water will cause the refrigerator oil to deteriorate.

- R410A refrigerant does not contain any chlorine. Therefore, gas leak detec-

tors for conventional refrigerants will not react to it.

• Manage the tools more carefully than normal.

- If dust, dirt, or water gets in the refrigerant cycle, the refrigerator oil will dete-

riorate.

• Never use existing refrigerant piping.

- The large amount of chlorine in conventional refrigerant and refrigerator oil

in the existing piping will cause the new refrigerant to deteriorate.

• Store the piping to be used during installation indoors and keep both
ends of the piping sealed until just before brazing.

- If dust, dirt, or water gets into the refrigerant cycle, the oil will deteriorate and

the compressor may fail.

• Do not use a charging cylinder.

- Using a charging cylinder may cause the refrigerant to deteriorate.

• Do not use special detergents for washing piping.

8.2. Refrigerant piping system

Connection Example

[Fig. 8.2.1] (P.3)

Å Heat source model ı Liquid pipe
Ç Gas pipe Î Total capacity of indoor units
‰ Model number Ï Downstream unit model total
Ì Branch kit model
Ó 4-Branching header (Downstream unit model total
¬ 8-Branching header (Downstream unit model total
Ô 10-Branching header (Downstream unit model total
A Heat source unit B First branch
C Indoor unit D Cap

<
=

<
=

200)

400)

<
=

650)

9

FINL EPGRRUTR