Daikin RWEYQ144PCYD user guide manual

INSTALLATION MANUAL

System air conditioner

MODEL

RWEYQ72PCYD
RWEYQ84PCYD
RWEYQ144PCYD
RWEYQ168PCYD
RWEYQ216PCYD
RWEYQ252PCYD

Read these instructions carefully before installation.
Keep this manual in a handy place for future reference.
This manual should be left with the equipment owner.

Lire soigneusement ces instructions avant I’installation.
Concerver ce manuel à portée de main pour référence ultérieure.
Ce manuel doit être donné au propriétaire de l’équipement.

RWEYQ72PCTJ
RWEYQ84PCTJ
RWEYQ144PCTJ
RWEYQ168PCTJ
RWEYQ216PCTJ
RWEYQ252PCTJ

English

Français

Español

Lea cuidadosamente estas instrucciones antes de instalar.
Guarde este manual en un lugar a mano para leer en caso de tener alguna duda.
Este manual debe permanecer con el propietario del equipo.

1

2

figure 1

2

figure 3

1

≥13/16 (20)

1

(350)

≤13-3/4

[3]

30-11/16 (780)

2 (PCYD)

2 (PCTJ)

≥13/16 (20)

1

2

A

B

5

3

BB

4

A

A

A

A: ≥60 in. (1500 mm)
B: ≥40 in. (1000 mm)

[4]

6

≥35-7/16

(900)

≥13-3/4

≤9-13/16

(250)

(350)

8

≥15-3/8

(390)

21-5/8

≥3-15/16 (100)

(550)

9

5

8

9

≥19-11/16

(500)

(300)

≥11-13/16

39-3/8 (1000)

75

≥13/16

(20)

7 7

5 5

9

8

6 6

≥13/16

(20)

∗10

8

Unit: in. (mm)

9

≥35-7/16 (900) ≥19-11/16 (500)

≥13/16

(20)

figure 2

3

1

4

2

(100)

3-15/16

2

15-3/4 (400)

29-5/16 (744)

3

(100)

3-15/16

12

13

7

14

6

8

2-3/8

(60)

5

11

9

10

[1]

≤15-3/4

(400)

15

Unit: in. (mm)

figure 6

2

4

Unit: in. (mm)

figure 4 figure 5 figure 7

[Heat recovery system][Heat pump system]

3

3

1

2

4

6

1

2

9

3
4

8

3

4

5

1

2

4

3

5

7

6

8

9

10

11

4

6

7

9

2

1

3

8

5

figure 8

figure 9

<RWEYQ-PCYD>

7

[Heat recovery system][Heat pump system]

7

A B C

1

3

<RWEYQ-PCTJ>

F1 F1F2 F2 Q1 Q2

TO IN/D UNIT

TO OUT/D UNIT TO MULTI UNIT

2

12

A1P

AB BC

F1 F2 F1 F2 F1 F2

A5P

ABC

C/H SELECTOR

4

5

F1 F2 F1 F2 F1 F2

F1 F2 F1 F2 F1 F2

6

7

[Heat recovery system][Heat pump system]

F1 F1F2 F2

IN/D OUT/D.BS

6

A1P

1F F F2 1Q

8

F1 F2

F1 F2

4

2

F1 F1F2 F2

IN/D OUT/D.BS

9

F1 F2

F1 F1F2 F2 Q1 Q2

TO IN/D UNIT

TO OUT/D UNIT TO MULTI UNIT

12

A5P

ABC

C/H SELECTOR

F1 F1F2 F2

IN/D OUT/D.BS

10

F1 F2

7

F1 F2

F1 F2

11

A B C

1

figure 10

A1P

BCF1F2 12QQ

A B C F1 F1F2 F2 Q1 Q2

C/H SELECTOR

TO IN/D UNIT

TO OUT/D UNIT TO MULTI UNIT

A1P

ABC1FF F21Q

2

3

4

F1 F2 F1 F2 F1 F2

5

6

4

F1 F1F2 F2

IN/D OUT/D.BS

8

F1 F2

ABCF1 F1F2 F2 Q1 Q2

C/H SELECTOR

TO IN/D UNIT

2

F1 F1F2 F2

IN/D OUT/D.BS

9

F1 F2

F1 F1F2 F2

IN/D OUT/D.BS

10

F1 F2

TO OUT/D UNIT TO MULTI UNIT

F1 F2

F1 F2

F1 F2 F1 F2 F1 F2

F1 F2 F1 F2 F1 F2

6

F1 F2

11

<RWEYQ-PCYD>

1

A1P

4

F1 F2 F1 F2 Q1 Q2 Q1 Q2 Q1 Q2

8

23

56 6 6

A5P

A BC

9

7

<RWEYQ-PCYD>

1 4

X2M

12

A1P

2

X1M

F1 F2 F1 F2 Q1 Q2

5

A5P

X3M

ABC

43

3

3

<RWEYQ-PCTJ>

1

23

A1P

4

A B C F1 F2 F1 F2 Q1 Q2 Q1 Q2 Q1 Q2

7

56 6 6

9

8

1 23

4

LOW NOISE

TO OUT/D UNIT TO OUT/D UNIT TO OUT/D UNIT

F1 F2

F1

F2

F1 F2 F1 F2

6

5

7

<RWEYQ-PCTJ>

A1P

A B C F1 F2 F1 F2 Q1 Q2

1

12

X1M

X2M

2

X3M

43

3

figure 12figure 11

12

F1 F2 F1 F2

F1 F2

4

F1 F2

F1 F2

figure 13

1

figure 15

figure 14

11

10

2

12

13

14

A1P

TO IN/D

UNIT

F1 F2

ON

OFF

O
U
T

1

I

N

DS1

234

6

3

8

5

F1 F2 P1 P2

P1 P2

9

7

4

1

figure 16

<RWEYQ-PCYD>

A1P

ON

OFF

O
U

T

1234

I

N

DS1

A5P

A B C

<RWEYQ-PCTJ>

O

ON

OFF

1

U
T

1234

I

N

DS1

12

3

4

5

6

3

A1P

A B C

2

A B C

figure 17

<RWEYQ-PCTJ>

5

3

A B C

1

figure 18

<RWEYQ-PCYD>

2

1

4

6

7

8

9

5

3

10

11

1

4

6

2

7

8

9

10

11

figure 19

figure 20

1

figure 21

[Heat pump system]

2

3

[Heat recovery system]

1
2

3

4

78 9

10

[13]

4

14

5

11

5

15

16

∗6

12

∗17

4

1

2

A

3

B

5

[A-arrow view] [B-arrow view]

figure 22

(Fig. A) (Fig. B) (Fig. C)

C

figure 23

1

≤ ±15˚

2

[C-arrow view] [D-arrow view]

[Heat pump system]

1

2

[Heat recovery system]

R410A

1

5

D

3

3

4

11

10 10

12

9

7

3

4

15

5

6

16

18

14

figure 24

5

figure 25

13

1

9

10 10

12

R410A

7

3

2

4

8

15

17

5

4

3

2

[Heat pump system] [Heat recovery system]

1

2

5

3

6

4

1

figure 26 figure 27

6

18

1

2

1

2

4

3

4

3

RWEYQ72PCYD
RWEYQ84PCYD
RWEYQ144PCYD

RWEYQ168PCYD
RWEYQ216PCYD
RWEYQ252PCYD

RWEYQ72 PCTJ
RWEYQ84 PCTJ
RWEYQ14 4PCTJ

RWEYQ168PCTJ
RWEYQ216PCTJ
RWEYQ252PCTJ

VRV-WIV System

air conditioner

Installation

manual

CONTENTS

1. SAFETY CONSIDERATIONS ...................................................... 1

2. INTRODUCTION.......................................................................... 3

2-1 Combination......................................................................... 3

2-2 Standard operation limit ....................................................... 3

2-3 Standard supplied accessories ............................................ 3

2-4 Option accessories............................................................... 3

2-5 Technical specifications ....................................................... 4

2-6 Electrical specifications ........................................................ 4

3. SELECTION OF LOCATION........................................................ 5

4. INSPECTING AND HANDLING THE UNIT.................................. 6

5. UNPACKING AND PLACING THE UNIT ..................................... 6

6. WATER PIPING WORK............................................................... 6

7. HANDLING OF THE BRAZED PLATE-TYPE HEAT

EXCHANGER............................................................................... 7

7-1 When designing the equipment............................................ 7

7-2 Before starting a test run...................................................... 7

7-3 Daily service and maintenance ............................................ 7

7-4 Water quality ........................................................................ 7

7-5 Maintenance of plate-type heat exchanger .......................... 8

8. FIELD WIRING............................................................................. 8

8-1 Optional parts....................................................................... 8

8-2 Power supply circuit and wire requirements......................... 8

8-3 General ................................................................................ 9

8-4 Examples ............................................................................. 9

8-5 In case of a local setting..................................................... 11

9. REFRIGERANT PIPING ............................................................ 11

9-1 Selection of piping material ................................................ 11

9-2 Protection against contamination when installing pipes..... 12

9-3 Pipe connection.................................................................. 12

9-4 Connecting the refrigerant piping ....................................... 12

9-5 Example of connection....................................................... 14

9-6 Air tight test and vacuum drying......................................... 15

9-7 Pipe insulation.................................................................... 15

9-8 Checking of device and installation conditions................... 15

9-9 Additional refrigerant charge .............................................. 15

9-10 Stop valve operation procedure ......................................... 16

10. CHECKS AFTER INSTALLATION ............................................. 17

11. TEST RUN ................................................................................. 17

11-1 Air discharge ...................................................................... 17

11-2 Before turn on the power supply ........................................ 17

11-3 Check operation ................................................................. 17

11-4 Check of normal operation ................................................. 18

12. ONSITE SETTINGS ................................................................... 18

12-1 Energy saving and optimum operation............................... 18

13. CAUTION FOR REFRIGERANT LEAKS ................................... 21

1. SAFETY CONSIDERATIONS

Read these SAFETY CONSIDERATIONS for Installation carefully
before installing air conditioning equipment. After completing the instal­lation, make sure that the unit operates properly during the startup oper­ation.
Instruct the customer on how to operate and maintain the unit. Inform
customers that they should store this Installation Manual with the Oper­ation Manual for future reference.
Always use a licensed installer or contractor to install this product.
Improper installation can result in water or refrigerant leakage, electrical
shock, fire, or explosion.
Meanings of DANGER, WARNING, CAUTION, and NOTE Symbols:

DANGER .....................Indicates an imminently hazardous situa-

tion which, if not avoided, will result in
death or serious injury.

WARNING................... Indicates a potentially hazardous situation

which, if not avoided, could result in death
or serious injury.

CAUTION.................... Indicates a potentially hazardous situation

which, if not avoided, may result in minor or
moderate injury. It may also be used to
alert against unsafe practices.

NOTE.......................... Indicates situations that may result in

equipment or property-damage accidents
only.

DANGER

• Refrigerant gas is heavier than air and replaces oxygen. A
massive leak can lead to oxygen depletion, especially in base­ments, and an asphyxiation hazard could occur leading to se­rious injury or death.

• Do not ground units to water pipes, gas pipes, telephone
wires, or lightning rods as incomplete grounding can cause a
severe shock hazard resulting in severe injury or death. Addi­tionally, grounding to gas pipes could cause a gas leak and
potential explosion causing severe injury or death.

• If refrigerant gas leaks during installation, ventilate the area
immediately. Refrigerant gas may produce toxic gas if it
comes in contact with fire. Exposure to this gas could cause
severe injury or death.

• After completing the installation work, check that the refriger­ant gas does not leak throughout the system.

• Do not install unit in an area where flammable materials are
present due to risk of explosions that can cause serious injury
or death.

• Safely dispose all packing and transportation materials in ac­cordance with federal/state/local laws or ordinances. Packing
materials such as nails and other metal or wood parts, includ­ing plastic packing materials used for transportation may
cause injuries or death by suffocation.

WARNING

• Only qualified personnel must carry out the installation work.
Installation must be done in accordance with this installation
manual. Improper installation may result in water leakage,
electric shock, or fire.

• When installing the unit in a small room, take measures to keep
the refrigerant concentration from exceeding allowable safety
limits. Excessive refrigerant leaks, in the event of an accident in
a closed ambient space, can lead to oxygen deficiency.

• Use only specified accessories and parts for installation work.
Failure to use specified parts may result in water leakage,
electric shocks, fire, or the unit falling.

• Install the air conditioner on a foundation strong enough that it
can withstand the weight of the unit. A foundation of insuffi­cient strength may result in the unit falling and causing injuries.

• Take into account strong winds, typhoons, or earthquakes
when installing. Improper installation may result in the unit
falling and causing accidents.

• Make sure that a separate power supply circuit is provided for
this unit and that all electrical work is carried out by qualified
personnel according to local, state and national regulations.
An insufficient power supply capacity or improper electrical
construction may lead to electric shocks or fire.

• Make sure that all wiring is secured, that specified wires are
used, and that no external forces act on the terminal connec­tions or wires. Improper connections or installation may re­sult in fire.

• When wiring, position the wires so that the control box cover
can be securely fastened. Improper positioning of the control
box cover may result in electric shocks, fire, or the terminals
overheating.

• Before touching electrical parts, turn off the unit.

• This equipment can be installed with a Ground-Fault Circuit
Interrupter (GFCI). Although this is a recognized measure for
additional protection, with the grounding system in North
America, a dedicated GFCI may not be necessary.

• Securely fasten the outside unit terminal cover (panel). If the
terminal cover/panel is not installed properly, dust or water
may enter the outside unit causing fire or electric shock.

• When installing or relocating the system, keep the refrigerant
circuit free from substances other than the specified refriger­ant (R410A) such as air. Any presence of air or other foreign
substance in the refrigerant circuit can cause an abnormal
pressure rise or rupture, resulting in injury.

• Do not change the setting 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 Daikin are used, fire or explosion may occur.

• Indoor and outside units are for indoor installation only.

• Do not install the air conditioner in the following locations:
(a) Where a mineral oil mist or oil spray or vapor is produced,

for example, in a kitchen.
Plastic parts may deteriorate and fall off or result in water
leakage.

(b) Where corrosive gas, such as sulfurous acid gas, is pro-

duced.
Corroding copper pipes or soldered parts may result in
refrigerant leakage.

(c) Near machinery emitting electromagnetic waves.

Electromagnetic waves may disturb the operation of the
control system and cause the unit to malfunction.

(d) Where flammable gas may leak, where there is carbon fiber,

or ignitable dust suspension in the air, or where volatile
flammables such as thinner or gasoline are handled. Operat­ing the unit in such conditions can cause a fire.

• Take adequate measures to prevent the outside unit from be-

ing used as a shelter by small animals. Small animals making
contact with electrical parts can cause malfunctions, smoke,
or fire. Instruct the customer to keep the area around the unit
clean.

CAUTION

• Do not touch the switch with wet fingers. Touching a switch
with wet fingers can cause electric shock.

• Do not allow children to play on or around the unit to prevent
injury.

• Do not touch the refrigerant pipes during and immediately af­ter operation as 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. To avoid injury, give the pipes time to re­turn to normal temperature or, if you must touch them, be sure
to wear proper gloves.

• Heat exchanger fins are sharp enough to cut.
To avoid injury wear glove or cover the fins when working
around them.

• Install drain piping to proper drainage. Improper drain piping
may result in water leakage and property damage.

• Insulate piping to prevent condensation.

• Be careful when transporting the product.

• Do not turn off the power supply immediately after stopping
operation. Always wait for at least 5 minutes before turning off
the power supply. Otherwise, water leakage may occur.

• Do not use a charging cylinder. Using a charging cylinder may
cause the refrigerant to deteriorate.

• Refrigerant R410A in the system must be kept clean, dry, and
tight.

(a) Clean and Dry -- Foreign materials (including mineral oils

such as SUNISO oil or moisture) should be prevented from
getting into the system.

(b) Tight -- R410A does not contain any chlorine, does not

destroy the ozone layer, and does not reduce the earth’s pro­tection again harmful ultraviolet radiation. R410A can con­tribute to the greenhouse effect if it is released. Therefore
take proper measures to check for the tightness of the refrig­erant piping installation. Read the chapter Refrigerant Pip­ing and follow the procedures.

• Since R410A is a blend, the required additional refrigerant
must be charged in its liquid state. If the refrigerant is charged
in a state of gas, its composition can change and the system
will not work properly.

• The indoor unit is for R410A. See the catalog for indoor mod­els that can be connected. Normal operation is not possible
when connected to other units.

• Remote controller (wireless kit) transmitting distance can be
shorter than expected in rooms with electronic fluorescent
lamps (inverter or rapid start types). Install the indoor unit far
away from fluorescent lamps as much as possible.

NOTE

• Install the power supply and transmission wires for the indoor
and outside units at least 3.5 feet (1 m) away from televisions
or radios to prevent image interference or noise. Depending
on the radio waves, a distance of 3.5 feet (1 m) may not be suf­ficient to eliminate the noise.

• Dismantling the unit, treatment of the refrigerant, oil and addi­tional parts must be done in accordance with the relevant lo­cal, state, and national regulations.

• 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, vacuum
gauge, or refrigerant recovery equipment.

• If the conventional refrigerant and refrigerator oil are mixed in
R410A, the refrigerant may deteriorate.

• This air conditioner is an appliance that should not be acces­sible to the general public.

• The wall thickness of field-installed pipes should be selected
in accordance with the relevant local, state, and national reg­ulations.

Codes and Regulations

This product is designed and manufactured to comply with national
codes. Installation in accordance with such codes and/or prevailing
local codes/regulations is the responsibility of the installer. The manu­facturer assumes no responsibility for equipment installed in violation of
any codes or regulations. Rated performance is achieved after charge
adjustment (sub-cooling of 14±1°F (8±0.5°C) and superheat of 3±1°F
(1.7±0.5°C)) and 72 hours of operation.

2. INTRODUCTION

This installation manual concerns VRV inverters of the Daikin
RWEYQ-PC series. These units are designed for indoor installation and
used for cooling and heat pump applications.

The RWEYQ-PC units can be combined with Daikin VRV series indoor
units for air conditioning purposes.
The present installation manual describes the procedures for unpack­ing, installing and connecting the RWEYQ-PC units. Installation of the
indoor units is not described in this manual. Always refer to the installa­tion manual supplied with these units for their installation.

2-1 Combination

The indoor units can be installed in the following range.

• Always use appropriate indoor units compatible with R410A.

To learn which models of indoor units are compatible with
R410A, refer to the product catalogs.

• The Branch Selector units that combined with RWEYQ-PC units for
changing the refrigerant flow to indoor units are T type (BSQ-TVJ,
BS-Q54TVJ) only, or P type (BSVQ-PVJU, BSV-Q36PVJU) only. Do
not combine the T type and P type in the system. Combination of T
type and P type cause malfunction.

• Total capacity/quantity of indoor units
〈Outside unit〉〈Total capacity index of indoor units〉〈Total quantity of indoor units〉
RWEYQ72PCYD/CTJ
RWEYQ84PCYD/CTJ
RWEYQ144PCYD/CTJ
RWEYQ168PCYD/CTJ
RWEYQ216PCYD/CTJ
RWEYQ252PCYD/CTJ

2-2 Standard operation limit

The figures below assume following operating conditions for indoor and
outside units:

Equivalent pipe length ........................................25 ft. (7.6 m)

Level difference..................................................................... 0

Cooling Heating

120

110

100

90

80

70

60

50

6050 70 80 90 6050 70 80 90

〈In case of antifreeze usage〉
Cooling Heating

120

110

100

90

80

70

60

50

40

30

20

6050 70 80 90 6050 70 80 90

A Entering water temperature (°F)
B Indoor temperature (°FWB)
C Indoor temperature (°FDB)

Range for continuous operation
Range for operation
Range for pull down operation
Range for warming up operation

......... 36-93.5 12 units

......... 42-109 14 units

....... 72-187 24 units

....... 84-218 29 units

..... 108-280 36 units

..... 126-327.5 36 units

AA

120

110

100

90

80

70

60

50

CB

AA

110

100

90

80

70

60

50

40

30

20

10

CB

• Operation range of water flow rate is 13.2-39.6 gpm (50-150 L/min).
(21.2-39.6 gpm (80-150 L/min) in case of antifreeze usage.)

• The unit is designed for the following operation range;

Entering water temperature: 67-95°F (20-35°C)
Water flow rate: 15.9gpm (60L/min) or more

• During cooling operation when the outside temperature is very low, it
is possible that the thermostat switches off automatically in order to
protect the unit from freezing.

• Hold ambient temperature at 35-104°FDB (2-40°CDB).
Heat release from the unit (approx.): RWEYQ72: 2200 Btu/h
(0.64kW), RWEYQ84: 2450 Btu/h (0.71kW)
It is therefore recommended to always ventilate the room.

2-3 Standard supplied accessories

• Make sure that the following accessories are included.
(Check by removing the front panel.)

Name

For discharge

gas

For suction

Quantity 1 pc. 1 pc. 1 pc. 7 pcs. 2 pcs.

(Note)

Shape

Name Conduit mounting plate

Quantity 2 pcs. 2 pcs.

Shape

gas (1)

Accessory pipes

For suction

gas (2)

[Others]

•

Installation manual

•

Operation manual

Clamp (A) Clamp (B)

White

Black

(Refer to figure 1)

1. • Operation manual

• Installation manual

•Clamp (A)

•Clamp (B)

• Conduit mounting plate

2. Accessory pipes

• For discharge gas

• For suction gas (1)

• For suction gas (2)

NOTE

The accessory pipe for discharge gas is used for the heat recovery sys­tem. (Not used for the heat pump system.)

2-4 Option accessories

To install the above outside units, the following optional parts are also
required.

• Refrigerant branch kit
(For R410A only: Always use an appropriate kit dedicated for your
system.)

〈Heat pump system〉

REFNET header
REFNET joint

〈Heat recovery system ..... For 3-tube piping〉

REFNET header
REFNET joint

〈Heat recovery system ..... For 2-tube piping〉

REFNET header
REFNET joint

• Outside unit multi connection piping kit
(For R410A only: Always use an appropriate kit dedicated for
your system.)

Number of outside units
connected

Heat pump system BHFP22MA56U BHFP22MA84U

Heat recovery system BHFP26MA56U BHFP26MA84U

∗ To select an optimum kit, refer to 9. REFRIGERANT PIPING

KHRP26M22H9 KHRP26M33H9 KHRP26M72H9
KHRP26A22T9 KHRP26A33T9

KHRP26M72TU9 KHRP26M73TU9

KHRP25M33H9 KHRP25M72H9

KHRP25A22T9 KHRP25A33T9

KHRP26M22H9 KHRP26M33H9
KHRP26A22T9 KHRP26A33T9

KHRP25M72TU9 KHRP25M73TU9

KHRP26M72H9 KHRP26M73HU9

KHRP26M72TU9 KHRP26M73TU9

2 units 3 units

KHRP26M73HU9

KHRP25M73HU9

2-5 Technical specifications

General

Nominal cooling capacity (2)

Nominal heating capacity (3) (MBH)

Nominal input cooling / heating (4)

Dimensions HxWxD

Weight (YDN/TJU)

Connections

refrigerant liquid pipe (in.) 3/8 3/8

refrigerant gas pipe (in.) 3/4 7/8

refrigerant discharge gas pipe (5)

Water piping connections

Inlet pipe (in.)

Outlet pipe (in.)

Drain pipe (in.)

General

Nominal cooling capacity (2)

Nominal heating capacity (3) (MBH)

Nominal input cooling / heating (4)

Dimensions HxWxD

Weight (YDN/TJU)

Connections

refrigerant liquid pipe (in.) 1/2 5/8

refrigerant gas pipe (in.) 1-1/8 1-1/8

refrigerant discharge gas pipe (5)

Water piping connections

Inlet pipe (in.)

Outlet pipe (in.)

Drain pipe (in.)

General

Nominal cooling capacity (2)

Nominal heating capacity (3)

Nominal input cooling / heating (4)

Dimensions HxWxD

Weight (YDN/TJU)

Connections

refrigerant liquid pipe (in.) 5/8 3/4

refrigerant gas pipe (in.) 1-1/8 1-1/4

refrigerant discharge gas pipe (5)

Water piping connections

Inlet pipe (in.)

Outlet pipe (in.)

Drain pipe (in.)

(1)

Refer to the engineering data book for the complete list of specifications.

(2)

The

normal cooling capacities are based on:

–

Indoor temperature:

–Entering

water temperature:
–Equivalent pipe length: 25 ft. (7.6 m)
–Level difference: 0

(3)

The

normal heating capacities are based on:

–

Indoor temperature:

–

Entering water temperature:
–Equivalent pipe length: 25 ft. (7.6 m)
–Level difference: 0

(4)

The nominal input includes total input of the unit: compressor and control circuit.

(5) In case of heat recovery system

(MBH)

(kW) 4.20 / 4.00 5.60 / 5.40

(in.

(mm))

(lbs.

(kg))

(in.) 5/8 3/4

(MBH)

(kW) 8.40 / 8.00 11.20 / 10.80

(in.

(mm))

(lbs.

(kg))

(in.) 7/8 7/8

(MBH)

(MBH)

(kW) 12.60 / 12.00 16.80 / 16.20

(in.

(mm))

(lbs.

(kg))

(in.) 1 1-1/8

80.6°FDB / 67°FWB (27°CDB / 19°CWB)
86°F (30°C)

68°FDB / 59°FWB (20°CDB / 15°CWB)
68°F (20°C)

(1)

RWEYQ72PCYD/CTJ RWEYQ84PCYD/CTJ

72 84

81 94.5

39-3/8×30-3/4×21-11/16

(1000×780×550)

343/330

(156/150)

1-1/4FPT

female Thread

1-1/4FPT

female Thread

1/2FPS

female Thread

RWEYQ144PCYD/CTJ RWEYQ168PCYD/CTJ

144 168

162 189

(39-3/8×30-3/4×21-11/16)×2

(1000×780×550)×2

343×2/330×2

(156×2/150×2)

(1-1/4FPT)×2

female Thread

(1-1/4FPT)×2

female Thread

(1/2FPS)×2

female Thread

RWEYQ216PCYD/CTJ RWEYQ252PCYD/CTJ

216 252

243 283.5

(39-3/8×30-3/4×21-11/16)×3

(1000×780×550)×3

343×3/330×3

(156×3/150×3)

(1-1/4FPT)×3

female Thread

(1-1/4FPT)×3

female Thread

(1/2FPS)×3

female Thread

343/330

(156/150)

1-1/4FPT

female Thread

1-1/4FPT

female Thread

1/2FPS

female Thread

343×2/330×2

(156×2/150×2)

(1-1/4FPT)×2

female Thread

(1-1/4FPT)×2

female Thread

(1/2FPS)×2

female Thread

343×3/330×3

(156×3/150×3)

(1-1/4FPT)×3

female Thread

(1-1/4FPT)×3

female Thread

(1/2FPS)×3

female Thread

Compressor

Oil type

Crankcase heater (W) 33 33

Refrigerant type R410A R410A

Refrigerant charge

Compressor

Oil type

Crankcase heater (W) (33)×2 (33)×2

Refrigerant type R410A R410A

Refrigerant charge

Compressor

Oil type

Crankcase heater (W) (33)×3 (33)×3

Refrigerant type R410A R410A

Refrigerant charge

RWEYQ72PCYD/CTJ RWEYQ84PCYD/CTJ

Synthetic (ether) oil Synthetic (ether) oil

(lbs.

(kg))

(lbs.

(kg))

(lbs.

(kg))

9.9 (4.5) 11.5 (5.2)

RWEYQ144PCYD/CTJ RWEYQ168PCYD/CTJ

Synthetic (ether) oil Synthetic (ether) oil

(9.9)×2 ((4.5)×2) (11.5)×2 ((5.2)×2)

RWEYQ216PCYD/CTJ RWEYQ252PCYD/CTJ

Synthetic (ether) oil Synthetic (ether) oil

(9.9)×3 ((4.5)×3) (11.5)×3 ((5.2)×3)

2-6 Electrical specifications

Model

Power supply

Phase 3~ 3~

Frequency (Hz) 60 60

Voltage (V) 460 460

Voltage tolerance (%) ±10 ±10

Recommended fuses (A) 15 15

Compressor

Phase 3~ 3~

Frequency (Hz) 60 60

Voltage (V) 460 460

Nominal running current (A) 5.3 7.0

Model

Power supply

Phase 3~ 3~

Frequency (Hz) 60 60

Voltage (V) 460 460

Voltage tolerance (%) ±10 ±10

Recommended fuses (A) (15)×2 (15)×2

Compressor

Phase 3~ 3~

Frequency (Hz) 60 60

Voltage (V) 460 460

Nominal running current (A) (5.3)×2 (7.0)×2

Model

Power supply

Phase 3~ 3~

Frequency (Hz) 60 60

Voltage (V) 460 460

Voltage tolerance (%) ±10 ±10

Recommended fuses (A) (15)×3 (15)×3

Compressor

Phase 3~ 3~

Frequency (Hz) 60 60

Voltage (V) 460 460

Nominal running current (A) (5.3)×3 (7.0)×3

RWEYQ72PCYD RWEYQ84PCYD

RWEYQ144PCYD RWEYQ168PCYD

RWEYQ216PCYD RWEYQ252PCYD

Model

Power supply

Phase 3~ 3~

Frequency (Hz) 60 60

Voltage (V) 208/230 208/230

Voltage tolerance (%) ±10 ±10

Recommended fuses (A) 30 30

Compressor

Phase 3~ 3~

Frequency (Hz) 60 60

Voltage (V) 208/230 208/230

Nominal running current (A) 11.6 15.4

Model

Power supply

Phase 3~ 3~

Frequency (Hz) 60 60

Voltage (V) 208/230 208/230

Voltage tolerance (%) ±10 ±10

Recommended fuses (A) (30)×2 (30)×2

Compressor

Phase 3~ 3~

Frequency (Hz) 60 60

Voltage (V) 208/230 208/230

Nominal running current (A) (11.6)×2 (15.4)×2

Model

Power supply

Phase 3~ 3~

Frequency (Hz) 60 60

Voltage (V) 208/230 208/230

Voltage tolerance (%) ±10 ±10

Recommended fuses (A) (30)×3 (30)×3

Compressor

Phase 3~ 3~

Frequency (Hz) 60 60

Voltage (V) 208/230 208/230

Nominal running current (A) (11.6)×3 (15.4)×3

RWEYQ72PCTJ RWEYQ84PCTJ

RWEYQ144PCTJ RWEYQ168PCTJ

RWEYQ216PCTJ RWEYQ252PCTJ

3. SELECTION OF LOCATION

This unit does not have specifications for outdoor installation. The
unit must be installed indoors (example: machine room, …).

Paying attention to the conditions mentioned below, select the place for
installation with a prior approval of customer.

1.

The foundation is strong enough to support the weight of the unit and
the floor is flat to prevent vibration and noise generation.

2.

Consider the space required for refrigerant piping work when install­ing. Refer to [Necessary Space].

3.

There is no danger of fire due to leakage of inflammable gas.

4.

The piping length between the outside unit and the indoor unit may
not exceed the allowable piping length. 9. REFRIGERANT PIPING.

5.

Locations where the noise of the unit operating will not disturb
nearby houses, etc.

6.

Locations with airflow and ventilation holes capable of dissipating
heat from the machine and where the ambient temperature around
the outside unit is between 35 and 104°F (0 and 40°C) and the
humidity does not exceed 80%.

[Necessary Space]

When installing, secure the space mentioned below without fail.

(Refer to figure 2)

1. In case of a single installation

2. In case of series installations

3. Top view

4. Side view

5. Outside unit

6. Service Space (front side)

7. Service Space (back side)

8. Space for installing water piping

∗Secure an enough space for removing the front panel.

9. Ventilation Space

∗above the area ( ) of the outside unit.

10. Secure spaces in the front, back and top sides as same as
the case of single installation.

DANGER

• Do not install unit in an area where flammable materials are

present due to risk of explosion resulting in serious injury or death.

• Refrigerant is heavier than air and replaces oxygen. A massive leak
could lead to oxygen depletion, especially in basements, and an as­phyxiation hazard could occur leading to serious injury or death. Re­fer to the chapter “Caution for refrigerant leaks”.

NOTE

1.

An inverter air conditioner may cause electronic noise generated
from AM broadcasting. Examine where to install the main air con­ditioner and electric wires, keeping proper distances away from
stereo equipment, personal computers, etc.

(Refer to figure 3)

1. Indoor unit

2. Branch switch, overcurrent breaker

3. Remote controller

4. Cool/Heat selector

5. Personal computer or radio

If the electric wave of AM broadcasting is particularly weak, keep dis­tances of 10 ft. (3 m) or more and use conduit tubes for power supply
and transmission wiring.

2.

Water quality
Water containing high level of foreign materials may cause the
corrosion of heat exchanger and piping or scale accumulation.
Use water satisfying “7-4 Water quality”.

3.

Cooling tower
Use a closed type cooling tower without fail. (Open type tower
cannot be used.)

4.

Strainer
Install a strainer (50 mesh or more) without fail at the inlet of water
piping. (If sands, wastes, rust particles, etc. are mixed in the water
circulation system, damage to the plate-type heat exchanger may
be caused by the corrosion of metal materials and clogging of the
heat exchanger.)

WARNING

Do not install in the following locations.

•

Locations such as kitchens which contain a lot of mineral oil or steam
in the atmosphere or where oil may splatter on the unit.
Resin parts may deteriorate, causing the unit to fall or leak.

• Locations where sulfurous acids and other corrosive gases may be
present in the atmosphere.
Copper piping and soldered joints may corrode, causing refrigerant
to leak.

• Locations where equipment that produces electromagnetic waves is
found.
The electromagnetic waves may cause the control system to mal­function, preventing normal operation.

4. INSPECTING AND HANDLING THE UNIT

At delivery, the package should be checked and any damage should be
reported immediately to the carrier claims agent.

When handling the unit, take into account the following:

1.

Fragile, handle the unit with care.

Keep the unit upright in order to avoid compressor damage.

2.

Choose the path along which the unit is to be brought in ahead of
time.

3.

In order to prevent any damage to the unit during installation, use
slings (cloth) or patch plates and lift the unit referring to figure 4.

4.

Lift the unit preferably with a crane and 2 belts of at least 27 ft. (8 m)
long.

5.

When lifting the unit with a crane, always use protectors to prevent
belt damage and pay attention to the position of the unit’s center of
gravity.

6.

Be sure use the standard supplied accessories and dedicated parts
as installation parts.

(Refer to figure 4)

1. Patch plates or clothes

2. Belt sling

NOTE

• Use belt sling of 13/16 in. (20 mm) width or less which adequately

bears the weight of the product.

5. UNPACKING AND PLACING THE UNIT

• Make sure the area around the machine drains properly by setting up
drainage grooves around the foundation.

• Make sure the unit is installed level on a sufficiently strong base to
prevent vibration and noise.

• Secure the unit to its base using foundation bolts. (Use four commer­cially available 7/16 in. (M12) foundation bolts, nuts, and washers.)

• The foundation bolt should protrude 13/16 in.
(20 mm) from the foundation surface.

• Fix 4 foundation bolts.

• Support the unit with the foundation which is
larger than the hatched area shown in figure 5.

(Refer to figure 5)

1. Front side

2. Position of foundation bolts

3. Hole for a foundation bolt

(φ11/16 in. (17 mm) holes at 4 corners)

4. Avoid such a foundation where the unit is supported by
4 corner points.

NOTE

• In unavoidable circumstances, where the unit has to be installed

either touching or close to a wall; place the unit such that transmis­sion of vibration can be restricted or minimized. Vibrations can be
dampened by using cushions, foam etc.

13/16 in.

(20 mm)

NOTE

• Prepare a water drainage channel around the foundation to con-

densate waste water from around the unit.

• If the unit is to be installed on a roof, check the strength of the roof
and its drainage facilities first.

• Make sure the area around the machine drains properly by setting up
drainage grooves around the foundation.
(Condensate water is sometimes discharged from the outside unit
when it is running.)

• Use a nut with a resin clip plate to protect the nut tightening part from
rusting.

Resin clip plate

6. WATER PIPING WORK

• The water pressure resistance of water piping of this outside unit is
285 psig.

• The connection port for water piping is located in the front. The con­nection ports for drain piping are located in the front and back. When
using the back port, change the cast iron plug from the back to the
front and securely close it.

• In indoor use, piping work should be such that now water drops on
the outer plate.

• The lateral protruding section of the drain piping should be short
(within 15-3/4 in. (400 mm)) and installed in a downward direction.
The diameter of drain pipe should be the same as the diameter of
unit connection (1/2 in.) or more.

• The diameter of water pipe should be the same as the diameter of
unit connection (1-1/4 in.) or more.

• Install an air purge valve in the midway of the water piping to prevent
cavitation.

• After completing the drain piping work, make sure that the water runs
smoothly without any clogging by dust.

• Do not connect the drain outlet to the water outlet.

• Install a strainer (50 mesh or more) in the inlet of water piping within
a distance of 4.9 ft. (1.5 m) from the outside unit.
(If sand, waste or rust particles are mixed in the water circulation
system, metal materials will become corrosive.)

• Install insulation on the inlet/outlet of water piping to prevent conden­sation and freezing.
At installing insulation on water in/outlet pipe, use Polyurethane form
thickness 3/16 in. (5 mm) for insulation of water piping socket on heat
exchanger.

• Install insulation up to the base of heat exchanger as shown in the
figure 6.

• Install a gate valve for chemical cleaning in an easy position to han­dle.

• Use water pipes compliant with the local and national codes.

• Run the water pump to flush inside of water piping.
Then, clean the strainer.

• If there is a possibility of freezing, take measures to prevent freezing.

• Tighten securely the connection of water piping and socket with
tightening torque of 220 ft.·lbf. (300 N·m) or less.
(If a large torque is applied, the unit may be damaged.)

(Refer to figure 6)

1. Air purge

2. Outlet of water

3. Inlet of water

4. Gate valve

5. Water piping socket

6. Water piping

7. Insulation

8. Heat exchanger

9. Strainer

10. Drain valve

11. Connection port to draining piping

12. Insulation cover

13. 3-1/8 in. (80 mm) or less

14. Insulation of water piping socket

15. Drain piping

7. HANDLING OF THE BRAZED PLATE­TYPE HEAT EXCHANGER

CAUTION

A brazed plate-type heat exchanger is used for this unit. Because
its structure is different from a conventional type heat exchanger, it
must be handled in a different manner.

7-1 When designing the equipment

1.

Install a strainer (50 mesh or more) at the water inlet side adjacent to
the outside unit in order to prevent any foreign materials such as
dust, sand, etc. from entering.

2.

Depending on the water quality, scale may stick to the plate-type
heat exchanger. In order to remove scale, it is necessary to use
chemicals to clean it at regular intervals. To this end, install a gate
valve in the water piping. Set up a piping connection port on the pip­ing between this gate valve and the outside unit for cleaning by
chemicals.

3.

For the purpose of cleaning and water drain-off from the outside unit
(water draining during a long period of non-use in winter, draining
upon starting of season-off), install an “air discharge valve” and a
“water draining plug” at the inlet/outlet ports of water piping. In addi­tion, install an “automatic air discharging valve” at the top of riser pip­ing or at the top of a portion where air tends to stay.

4.

Independent of the piping inlet of the outside unit, install a cleanable
strainer at a portion close to the pump piping inlet.

5.

Carry out complete cooling/thermal insulation of water piping and
outdoor dehumidification. If complete cooling or thermal insulation
has not been carried out, any damage may be caused during severe
winter due to freezing, in addition to thermal loss.

6.

When you stop operation during night or winter, it is necessary to take
measures to prevent water-related circuits from natural freezing in the
area the ambient temperature drops below 32°F (0°C) (by water drain
off, keeping the circulation pump running, warming up by a heater,
etc.) Freezing of water related circuits may result in any damage to
the plate-type heat exchanger. Therefore, take appropriate measures
depending on the circumstances of use.

(Refer to figure 7)

1. Example of piping

2. Water inlet piping

3. Strainer

4. Air discharge valve (for joint use with cleaning port)

5. Cleaning device

6. Strainer for pump

7. Automatic air discharge valve

8. Water outlet piping

9. Joint use with water draining plug

10. Plate-type heat exchanger

11. Outside unit

7-2 Before starting a test run

1.

Before starting a test run, please make sure that the piping work has
been carried out in a proper manner. Especially, make sure that the
strainer, air discharge valve, automatic water supply valve, expansion
tank and cistern are positioned at their places correctly.

2.

After water has been completely filled in, first run the pump only, and
then make sure that no air has been caught in the water circulation
system and that the water flow rate is correct. If any air has been
caught or the flow rate is not enough, the plate-type heat exchanger
may freeze. Measure any water pressure loss before and after the
outside unit and make sure that the flow rate is as designed. In case
of any abnormality, stop the test run immediately and carry out trou­ble shooting to resolve the trouble.

3.

Following the installation manual, carry out a test run of the outside
unit.

4.

After the test run has been completed, inspect the strainer at the inlet
piping of the outside unit. Clean it if it is dirty.

7-3 Daily service and maintenance

1.

Management of water quality
The plate-type heat exchanger has a structure that does not permit
dismantling and cleaning, or replacing any parts. Please pay attention
carefully to the quality of water to be used for the plate-type heat
exchanger in order to prevent corrosion and sticking of scale.
The water to be used for the plate-type heat exchanger should have at
least the quality as specified in the table below.
When using any corrosion prevention agent, scale depressant agent,
etc., such agent should have no corrosive features against stainless
steel and copper.

2.

Management of condenser water flow rate
If the condenser water flow rate is not enough, it will result in freezing
damage to the plate-type heat exchanger. Check for any clogging of
the strainer, any air being caught, any reduction in the flow rate due
to failure of the circulation pump by measuring the temperature and
pressure differences at the inlet and outlet ports of the plate-type
heat exchanger. If the aged difference in the temperature or pressure
has increased beyond the proper range, the flow rate should have
decreased. Stop the operation and remove the cause before restart­ing the operation.

3.

Steps to be taken if a freeze-protection device is activated
If the freeze-protection device is activated during operation, be sure
to remove the cause before restarting the operation. If the freeze-pro­tection device has been once activated, a partial freezing has already
occurred. If you restart the operation without removing the cause, the
plate-type heat exchanger will be closed and the ice cannot be
melted, and in addition, the freezing process will be repeated, result­ing in any damage to the plate-type heat exchanger, and this can lead
to refrigerant leaking or water entering the refrigerant circuit.

7-4 Water quality

Water quality standards for condenser water, hot water and
makeup water (4) (6)

Item (5)

pH (77°F (25°C))

Electrical Conductivity
(mS/ft. (mS/m))
(77°F (25°C))

Chloride ions

–

/L)

(mgcl

Sulfate ions

2-

/L)

(mgSO

4

Acid consumption
(pH4.8) (mgCaCO

Total hardness
(mgCaCO

Calcium hardness
(mgCaCO

Ionic-state silica
(mgSiO

Iron (mgFe/L)

Copper (mgCu/L)

Sulfate ion
(mgS

Ammonium ion
(mgNH

Residual chlorine
(mgCl/L)

Free carbon dioxide
(mgCO

Stability index

3

/L)

3

/L)

3

/L)

2

/L)

2-

/L)

+

4

/L)

2

/L)

Cooling water system (3)

Circulation system

Circulation

6.5 to 8.2 6.0 to 8.0 7.0 to 8.0 7.0 to 8.0

Less than

24.4 (80)

Less than

Less than

Less than

Less than

Less than

Less than 50Less than 30Less than 30Less than

Less than

Less than

Shall not be

detected

Less than

Less than

Less than

6.0 to 7.0 — — —

Makeup

water

Less than

9.1 (30)

Less than 50Less than 50Less than

200

Less than 50Less than 50Less than

200

Less than 50Less than 50Less than

100

Less than 70Less than 70Less than

200

Less than 50Less than 50Less than

150

Less than

1.0

Less than

0.3

Shall not be

Less than

1.0

Less than

0.3

Less than

4.0

Hot water system (2) Tendency (1)

Circulation

water

1.0

1.0

0.3

0.25

0.4

Makeup

water

Less than

9.1 (30)

50

50

50

70

50

30

Less than

0.3

Less than

0.1

Shall not be

detected

Less than

0.1

Less than

0.3

Less than

4.0

water

Standard items

Reference items

0.3

0.1

detected

0.1

0.3

4.0

(68 to 140°F
(20 to 60°C))

Less than

9.1 (30)

Less than

Less than

Shall not be

detected

Less than

Less than

Less than

Corrosion Scale

{{

{{

{

{

{{

{

{

{

{

{

{{

{

{

{

{

[NOTES]
(1) The circle marks in the columns for corrosion or scale to develop.
(2) Corrosion has a tendency to occur when water temperature is high

(104°F (40°C) or more), and if metals with no protective coating
whatever are directly exposed to water, it would be a good idea to
take effective measures against corrosion such as adding a corro­sion inhibitor or deterioration treatment.

(3) In a condenser water circuit that uses a closed cooling tower, the

closed circuit circulating water and makeup water must satisfy its
water quality standards for the hot water system, and passing water
and makeup water must satisfy those for the circulation type cooling
water system.

(4) The supply water must be clean tap water, industrial water or clean

underground water.
Do not use purified or softened water.

(5) The fifteen items in the table above represent typical causes of cor-

rosion and scale.

(6) Once-through water may cause corrosion.

Do not use once-through water.

7-5 Maintenance of plate-type heat exchanger

The performance of a plate-type heat exchanger may decline due to
scale accumulation. It may be damaged by freezing due to the drop of
flow rate. For this reason, it is necessary to carry out programmed main­tenances at a regular interval in order to prevent the scale from being
generated.

1.

Before entering the season for use, carry out the following
inspections:

1) Conduct a water quality test and make sure that it is within the
standard.

2) Clean the strainer.

3) Make sure that the flow rate is correct.

4) Make sure that the operational conditions (pressure, flow rate,
outlet temperature, etc.) are normal.

2.

Because the plate-type heat exchanger has a structure which does
not permit disassembling and cleaning, follow the following proce­dures for cleaning:

1) For maintenance purposes it is required to provide for a connec­tion port on the water inlet and on the water outlet. You must con­nect a circulation pump in between these 2 connection por ts when
cleaning the plate-type heat exchanger with chemicals.
For cleaning the scale in the plate-type heat exchanger it is rec­ommended to use a solution with 5% diluted formic, citric, oxalic,
acetic or phosphoric acid.
Never use hydrochloric, sulfuric or nitric acid because such solu­tions have a strong corrosive feature.

2) Make sure to provide for a stop valve in front of that inlet water
pipe connection port and for a stop valve after the outlet water
pipe connection port.

3) Connect the piping for circulation of cleaning chemicals to the
inlet and outlet piping of plate-type heat exchanger. Fill the clean­ing solution of 122-144°F (50-62°C) for a while in the plate-type
heat exchanger. Then, circulate the cleaning solution by a pump
for 2-5 hours.
The time for cleaning depends on the temperature of cleaning
solution or the degree of scale accumulation. Therefore, please
watch the change of the dirtiness (color) of cleaning solution to
determine the level of removal of scale.

4) After circulating the cleaning solution, discharge the solution from
the plate-type heat exchanger, fill the heat exchanger with a solu­tion of 1-2% sodium hydroxide (NaOH) or sodium bicarbonate
(NaHCO

ization purpose.

5) After the process of neutralization has been completed, rinse the
inner part of the plate-type heat exchanger with care using fresh
and clean water.

6) When using any cleaning agent sold in the market, check in
advance that such agent has no corrosive features against stain­less steel and copper.

7) For details of cleaning method, ask the manufacturer of related
cleaning agent.

3.

After cleaning has been completed, make sure that the unit can be
operated in a normal fashion.

). Circulate this solution for 15-20 minutes for neutral-

3

8. FIELD WIRING

NOTE

• All field wiring and components must be installed by a licensed elec­trician and must comply with relevant local and national regulations.

• The field wiring must be carried out in accordance with the wiring
diagrams and the instructions given below.

• Be sure to use a dedicated power supply circuit. Never use a power
supply shared by another appliance.

• Do not operate until refrigerant piping work is completed.
(If operated before complete the piping work, the compressor may
be broken down.)

• Never remove thermistor, sensor or etc. when connecting power
supply and transmission wiring.
(If operated with thermistor, sensor or etc. removed, the compressor
may be broken down.)

• This equipment can be installed with a Ground-Fault Circuit Inter­rupter (GFCI). Although this is a recognized measure for additional
protection, with the grounding system in North America, a dedicated
GFCI may not be necessary.

• This product have reversed phase protection detector only works
when the product started up.

• Replace two of the three phases (L1, L2, and L3) during reverse­phase protection circuit operation.
Reversed phase detection is not performed while the product is
operating.

• Do not run the unit by short cutting the protection device (S1PH).
If there exists the possibility of reversed phase, lose phase, momen­tary blackout or the power supply goes on and off while the product
is operating, attach a reversed phase protection circuit locally. Run­ning the product in reversed phase may break the compressor and
other parts.

• Attach the power supply wiring securely.

8-1 Optional parts

Cool/Heat selector

S1S .............................. Selector switch (fan, cool/heat)

S2S .............................. Selector switch (cool/heat)

NOTE

• Use copper conductors only.

• When using the adaptor for sequential start, refer to chapter “Exam-

ples”.

• For transmission wiring to outside-outside transmission F1-F2,
outside-indoor transmission F1-F2, refer to chapter “Examples”.

• For transmission wiring to the central remote controller, refer to the
installation manual of the central remote controller.

• Use insulated wire for the power supply.

8-2 Power supply circuit and wire requirements

A power supply circuit (see table below) must be provided for connec­tion of the unit. This circuit must be protected with the required safety
devices, i.e. a main switch, a slow blow fuse on each phase and/or a cir­cuit breaker.

Phase and
frequency

RWEYQ72/84PCYDφ3, 60 Hz 460 V 10.2 A 15 A AWG18-16

RWEYQ144/168PCYDφ3, 60 Hz 460 V 10.2+10.2 A 15+15 A AWG18-16

RWEYQ216/252PCYDφ3, 60 Hz 460 V 10.2+10.2+10.2 A 15+15+15 A AWG18-16

RWEYQ72/84PCTJφ3, 60 Hz 208/230 V 22.4 A 30 A AWG18-16

RWEYQ144/168PCTJφ3, 60 Hz 208/230 V 22.4+22.4 A 30+30 A AWG18-16

RWEYQ216/252PCTJφ3, 60 Hz 208/230 V 22.4+22.4+22.4 A 30+30+30 A AWG18-16

Vol ta ge

Minimum

circuit amp.

Recommended

fuses

NOTE

• Select the power supply wire in accordance with relevant local and

national regulations.

• Wire size must comply with the applicable local and national code.

• Specifications for local power supply and branch wiring are in com-

pliance with local cord.

Transmission

wiring

selection

8-3 General

• Make sure to connect the power supply wire to the power supply ter­minal block and to clamp it as shown in figure 8, chapter “Field wiring
connection”.

• As this unit is equipped with an inverter, installing a phase advancing
capacitor will not only reduce the power factor improvement effect,
but also may cause the capacitor to overheat due to high-frequency
waves. Therefore, never install a phase advancing capacitor.

• Keep power supply imbalance within 2% of the supply rating.

1.

Large imbalance will shorten the life of the smoothing capacitor.

2.

As a protective measure, the product will stop operating and an
error indication will be made, when power supply imbalance
exceeds 4% of the supply rating.

• Follow the “wiring diagram” when carrying out any electrical wiring.

• Only proceed with wiring work after blocking off all power supply.

• Always ground wires. (In accordance with national regulations of the
pertinent country.)

• This unit uses an inverter, and therefore generates noise, which will
have to be reduced to avoid interfering with other devices. The outer
casing of the product may take on an electrical charge due to leaked
electrical current, which will have to be discharged with the ground­ing.

• This unit has a negative phase protection circuit. (If it operates, only
operate the unit after correcting the wiring.)

WARNING

• Do not ground units to gas pipes, sewage pipes, lightning rods, or

telephone ground wires because incomplete grounding could
cause a severe shock hazard resulting in severe injury or death.

Gas pipes: can explode or catch fire if there is a gas leak.
Sewage pipes: no grounding effect is possible if hard plastic pip-

ing is used.
Telephone ground wires and lightning rods: dangerous when
struck by lightning due to an abnormal rise in electrical potential in
the grounding.

8-4 Examples

System example (Refer to figure 8)

Picking power supply and transmission wiring

1. Field power supply

2. Main switch

3. Disconnect switch

4. Fuse

5. Remote controller

6. Outside unit

7. Branch Selector unit

8. Indoor unit

9. Cool/Heat selector

power supply wiring (sheathed wire)
transmission wiring (sheathed wire)

CAUTION

• Use a conduit for the power supply wiring.
Outside the unit, make sure the low-voltage electric wiring (i.e. for the

•
remote controller, transmission, etc.) and the high-voltage electric wir­ing do not pass near each other, keeping them at least 5 in. apart. Prox­imity may cause electrical interference, malfunctions, and breakage.

• Be sure to connect the power supply wiring to the power supply ter­minal block and secure it as described in Field wiring connection.

• Transmission wiring should be secured as described in Field wiring

connection.

• Secure the wiring with the accessory clamps so that it does not touch
the piping.

• Make sure the wiring and the control box cover do not stick up above
the structure, and close the cover firmly.

WARNING

• Never connect power supply wiring to the terminal block for remote

controller wiring as this could damage the entire system.

(Refer to figure 9)

1. Power supply wiring and wiring for pump operation

(High voltage)

2. Transmission wiring
(Low voltage)

3. Set apart

Connect the wire to the terminal block on printed circuit board with care
since too much pressure may cause breakage of the printed circuit board.
Field wiring connection: transmission wiring, interlock circuit, pump
operation output and Cool/Heat selector.
Power supply and transmission wiring: Connect it using conduit
mounting plates.

Top plate

Conduit
mounting
plate
(accessory)

Conduit
(field supply)

Top plate

Lock nut
(field supply)

[In case of single outside unit]

(Refer to figure 10)

1. Cool/Heat selector

2. Printed circuit board (A1P)

3. Take care of the polarity

4. Use the conductor of sheathed wire (2 wire) (no polarity)

5. Terminal board (field supply)

6. Indoor unit

7. Never connect the power supply wire.

8. Branch Selector unit A

9. Branch Selector unit B

10. Last Branch Selector unit

11. Cooling only unit

12. ABC I/P printed circuit board (A5P)

[In case of multiple outside units]

(Refer to figure 11)

1. Unit A (Master unit)

2. Unit B

3. Unit C

4. TO IN/D UNIT

5. TO OUT/D UNIT

6. TO MULTI UNIT

7. To Cool/Heat selector (only Heat pump system)

8. To indoor unit

9. To other systems

• The transmission wiring between the outside units in the same pipe
line must be connected to the Q1/Q2 (TO MULTI UNIT) terminals.
Connecting the wires to the F1/F2 (TO OUT/D UNIT) terminals
results in system malfunction.

• The wiring for the other pipe line must be connected to the F1/F2 (TO
OUT/D UNIT) terminals of the printed circuit board in the outside unit
to which the transmission wiring for the indoor units is connected.

• The outside unit to which the transmission wiring for the indoor units
is connected is master unit.

• The transmission wiring between the outside units must be 98 ft.
(30 m) in length at maximum.

NOTE

• Be sure to keep the power supply and transmission wiring apart from
each other.
Be careful about polarity of the transmission wiring.
Make sure that the transmission wiring is clamped as shown in the
figure in chapter “Field wiring connection”.
Check that wiring does not make contact with refrigerant piping.
Firmly close the cover and arrange the electric wires so as to prevent
the cover or other parts from coming loose.

[Setting the interlock circuit and pump operation output.]

〈Pump operation output [high voltage]〉

• Use insulated wires of the size as mentioned below having rated volt­age of 250 V or more:
For single core: AWG16 or larger (conduit pipe work)
For multiple cores: AWG18 or larger

*The wiring for pump operation output is to be procured locally.

(Refer to figure 12)

1. Pump operation output terminal (X2M).

When water pump is linked with system operation, water
pump operation circuit shall be set between terminals (1)
and (2).
Contact specification --- 220 VAC, 3 mA-0.5 A

2. Printed circuit board (A1P)

3. Mount an insulation sleeve.

4. Connection of interlock circuit

Do not forget to connect an interlock circuit (an auxiliary a­contact of electromagnetic switch for the water pump) to
each outside unit.
(Select without fail an auxiliary a-contact able to switch min­imum load of DC15 V, 1 mA.)

〈When connecting for each outside unit〉
Connect to the terminal block (X3M) as shown in the bottom
right of the sketch.

〈When connecting multiple outside units as 1 single unit
(centralized interlock)〉
For this unit, it is possible to make a centralized interlock of
multiple outside units using an adapter (sold separately as
an accessory) for external control of outside units.
For details of wiring connection, refer to How to central-

ized interlock wiring.

5. ABC I/P printed circuit board (A5P)

〈How to the centralized interlock wiring〉

• When centralized interlock is done, see 8-5 In case of a local set­ting -(3).

• No wiring to terminal block X3M is necessary when centralized inter­lock is employed.

• For multiple outside units, external/external transmission wiring shall
be done for master unit only.

(Refer to figure 13)

1. Outside unit A

2. Outside unit B

3. Outside unit C

4. Adapter for external control

5. Interlock circuit of water pump

6. Out-Out transmission wiring

7. Use the conductor of sheathed wire (2 wire) (no polarity)

[Setting the cool/heat operation type]

1. Performing cool/heat setting with the remote controller con-

nected to the indoor unit.
Keep the Cool/Heat selector switch (DS1) on the printed circuit
board (A1P) at the factory setting position OFF.

(Refer to figure 16)

1. Remote controller

2. Performing cool/heat setting with the Cool/Heat selector.

Connect the Cool/Heat selector (optional) to the A/B/C termi­nals and set the Cool/Heat selector switch (DS1) on the printed
circuit board (A1P) to ON.

(Refer to figure 17)

1. Cool/Heat selector

2. ABC I/P printed circuit board (A5P)

• The wiring from the indoor units must be connected to the F1/F2 (In­Out) terminals on the printed circuit board in the outside unit.

• For the above wiring, always use sheathed vinyl wire with AWG18-16
(2 core wire). (3 core wire is allowable for the Cool/Heat selector
only.)

NOTE

• All transmission wire is field supply.

• Be sure to follow the limits below. If the transmission wiring is beyond
these limits, it may result in malfunction of transmission.
Maximum wiring length: 3280 ft. (1000 m)
Total wiring length: 6560 ft. (2000 m)
Max. branches No. of branches: 16
Wire length between outside units: 98 ft. (30 m)

Up to 16 branches are possible for transmission wiring. No branch­ing is allowed after branching.

Never connect the power supply to transmission wiring terminal
block. Otherwise the entire system may break down.

(Refer to figure 14)

1. Branch

2. Subbranching

For low-noise operation, it is necessary to get the optional “Exter­nal control adaptor for outside unit”.
For details, see the installation manual attached to the adaptor.

Field wiring connection:

L1, L2, L3, phase of the power supply wiring should be clamped to the
safety catch using the included clamp material.
The green and yellow striped wrapped wires should be used for ground­ing.
Make sure to connect the power supply wire to the power supply termi­nal block and fix it using attached clamp as shown in figure 15 and 19.

(Refer to figure 15)

1. Power supply

2. Branch switch, overcurrent breaker

3. Grounding wire

4. Attach insulation sleeves.

5. Power supply terminal block

6. Grounding terminal

7. Retain the ground wires along with the power supply wires

using the accessory clamp (A).

8. Grounding wire

9. When wiring, do not allow the ground wires to contact the

compressor lead wires. If the wires contact each other,
adverse effects may occur to other units.

10. When connecting two wires to one terminal, ensure that the
crimp-style terminals face with each other back to back.
Moreover, make sure that the wire of the smaller gauge is
located above.

11. Terminal block

12. Crimp-style terminal

13. Wire gauge: Small

14. Wire gauge: Large

(Refer to figure 19)

1. Intake for power supply wiring, pump operation output (high

voltage) and ground wiring.

2. Stop valve for discharge gas (high temperature part)

3. Insert the accessory clamp (B) in the hole of the fixing plate

for stop valves.

4. Power supply wiring, pump operation output (high voltage)
and ground wiring.

5. Retain the power supply wiring, pump operation output
(high voltage) and ground wiring with the accessory clamp
(B) to prevent them from touching with the stop valve for dis­charge gas.

6. Insert the accessory clamp (B) in the hole of the bottom of
control box.

7. Intake for transmission wiring. (low voltage)

8. Make sure to provide for a downward loop in the transmis-

sion wiring right in front of the location where the wiring is to
be fixed over the top plate of the control box. This in order to
prevent that condensate drips off the wiring into the control
box.

9. Fix the transmission wiring to resin clamps with the acces­sory clamps (A).

10. Pass the transmission wiring (low voltage) through the wire
clip.

11. Retain the power supply wiring, pump operation output
(high voltage) and ground wiring to the bottom of control
box with the accessory clamp (B).

WARNING

• Use only specified wire and connect wires to terminals tightly. Be
careful that wires do not place external stress on terminals. Keep
wires in neat order so as not to obstruct other equipment. Incom­plete connections could result in overheating, and in worse cases,
electric shock or fire.

CAUTION

〈Precautions when laying power supply wiring

Use round pressure terminals for connections to the power supply
terminal block.

terminal

When none is available, follow the instructions below.

• Do not connect wiring of different thicknesses to the power supply
terminal block. (Slack in the power supply wiring may cause
abnormal heat.)

• When connecting wiring which is the same thickness, do as
shown in the figure below.

Connect same­thickness wiring
to both sides.

• For wiring, use the designated power supply wire and connect
firmly, then secure to prevent outside pressure being exerted on
the terminal board.

• Use an appropriate screwdriver for tightening the terminal
screws. A screwdriver with a small head will strip the head and
make proper tightening impossible.

• Over-tightening the terminal screws may break them.

• See the table below for tightening torque for the terminal screws.

M5 (Power supply terminal block)
M5 (Ground)

M3 (Transmission wiring terminal block)

〈Precautions when connecting the ground

When pulling the ground wire out, wire it so that it comes through the
cut out section of the cup washer. (An improper ground connection
may prevent a good ground from being achieved.)

Round pressure terminal

It is forbidden to
connect two to
one side.

Power supply wireRound pressure

Cup washer

〉

It is forbidden to
connect wiring of
different thicknesses.

Tightening torque

(ft.·lbf. (N·m))

2.21-3.02
(3.0-4.1)

0.59-0.72

(0.80-0.96)

〉

Cut out section

8-5 In case of a local setting

If necessary, do the local settings as mentioned in the table below. For
setting, refer to the plate “Cares to be taken in servicing” attached to the
cover of control box.

Typical local settings
∗ For other settings than mentioned in the table below, refer to the

equipment design materials and service manual.

(1) Setting of switching between

cooling and heating

(2) Setting to prohibit sequenced

start

(3) Setting of centralized interlock

Setting of external demand

(4) Setting of abnormal display

when interlock contact is OFF

CAUTION

A separate adapter (sold separately as an accessory) for external
control of an outside unit is necessary when doing a demand oper­ation from an external instruction, setting of cooling and heating
through a centralized remote controller for cooling and heating
(sold separately as an accessory) and setting of centralized inter­lock. For details, refer to the manual attached to the adapter.

This setting is done when switching between cooling and
heating is performed by a switching remote controller (sold
separately as an accessory) installed on the outside unit.

This setting is done when the outside units are not started in
a sequenced order.

These settings are done when the interlocks are connected
in a lump-sum manner or when performing a demand opera­tion by external instruction.

This setting is done when making an abnormal display (HJ)
on a remote controller when the interlock contact is OFF
(when the heat source water pump is not operated).

9. REFRIGERANT PIPING

CAUTION

After completing installation, be sure to open the valves.
(See 9-9 Additional refrigerant charge for details) (Operating the
unit with the valves shut will break the compressor.)
Use R410A to add refrigerant. (The R410A refrigerant cylinder has
a pink stripe painted around it.)
All field piping must be installed by a licensed refrigeration techni­cian and must comply with relevant local and national regulations.

CAUTION TO BE TAKEN WHEN BRAZING REFRIGERANT PIPING

Do not use flux when brazing copper-to copper refrigerant piping.
(Particularly for the HFC refrigerant piping) Therefore, use the
phosphor copper brazing filler metal (B-Cu93P-710/795: ISO

3677) which does not require flux.
Note: Flux has an extremely negative effect on refrigerant piping

systems. For instance, if the chlorine based flux is used, it
will cause pipe corrosion or, in particular, if the flux contains
fluorine, it will damage the refrigerant oil.

NOTE

• Installation tools:

Gauge manifold, charge hose, etc.

Make sure to use installation tools that are exclusively used for
R410A installations to withstand the pressure and to prevent for­eign materials (e.g. mineral oils such as SUNISO and moisture)
from mixing into the system.
(The screw specifications differ for R410A and R407C.)

Vacuum pump

1.

Use a 2-stage vacuum pump with a non-return valve.

2.

Make sure the pump oil does not flow oppositely into the system
while the pump is not working.

3.

Use a vacuum pump which can evacuate to 500 microns.

9-1 Selection of piping material

1.

Foreign materials inside pipes (including oils for fabrication) must be
9 mg/10 ft or less.

2.

Use the following material specification for refrigerant piping:

• Construction material: Phosphoric acid deoxidized seamless
copper for refrigerant.

• Size: Determine the proper size referring to chapter “Example of
connection”.

• The wall thickness of the refrigerant piping should comply with
relevant local and national regulations. For R410A the design
pressure is 450 psig (3.1 MPa).

3.

Make sure to use the particular branches of piping that have been
selected referring to chapter “Example of connection”.

4.

Refer to chapter “Stop valve operation procedure” in 9-10 about the
stop valve operation procedure.

5.

Make sure to perform the piping installation within the range of the
maximum allowable pipe length, allowable level difference and allow­able length after branching as indicated in chapter “Example of con­nection”

6.

For installation of the refrigerant branch kit, refer to the installation
manual delivered with the kit.
And follow the conditions listed below.

• Mount the REFNET joint so that it branches either horizontally or
vertically.

• Mount the REFNET header so that it branches horizontally.

(Refer to figure 22)

1. Horizontal connections

2. Up to ± 30° or vertically

7.

Restriction for the installation of the outside unit multi connection
piping kit

3. Horizontal connections

To connect the piping between outside units, an optional piping kit
(multi connection piping kit) is always required. When installing the
piping, follow the instructions in the installation manual that comes
with the kit.

• Install the joint horizontally within a lean of ±15° with caution name­plate on top. Refer to figure 23 (Fig. A).
Do not connect it vertically. Refer to figure 23 (Fig. B).

• Reserve the straight part of 19-11/16 in. (500 mm) or more to the
branch pipe and do not bend the local pipe in that area. Straight part
of 19-11/16 in. (500 mm) or more can be reserved if a local pipe

(straight pipe) of 4-3/4 in. (120 mm) or more is connected to the joint.
Refer to figure 23 (Fig. C).

• Incorrect installation may cause breakage of outside unit.

(Refer to figure 23)

1. Caution nameplate

2. Horizontal line

3. Ground

4. Straight part of 19-11/16 in. (500 mm) or more

5. Local pipe

(4-3/4 in. (120 mm) length or more)

Precautions when selecting branch piping.

• If the overall equivalent length of piping between the outside units
and indoor units is 262.5 ft. (80 m) or more, be sure to enlarge the
main pipe in the liquid-side branch piping.
Depending on the length of the refrigerant piping, the cooling/heat­ing capacity may drop, but even in such cases it is ok to enlarge the
main pipe.

(Refer to figure 21)

1. Outside unit

2. Main pipe

3. Enlarge

4. The first refrigerant branch kit.

5. Indoor unit

[Liquid side]

RWEYQ72/84P type: ...................................................φ3/8”→ φ1/2”

RWEYQ144P type: ......................................................φ1/2”→ φ5/8”

RWEYQ168/216P type: ...............................................φ5/8”→ φ3/4”

RWEYQ252P type: ......................................................φ3/4”→ φ7/8”

9-2 Protection against contamination when install-

ing pipes

• Take measures to prevent foreign materials like moisture and

contamination from mixing into the system.

Place Installation period Protection method

Outdoor

Indoor Regardless of the period

More than a month Pinch the pipe
Less than a month

Pinch or tape the pipe

• Great caution is needed when passing copper tubes through

walls.

9-3 Pipe connection

• Only use the flare nuts included with the unit.

Using different flare nuts may cause the refrigerant to leak.

• Be sure to perform a nitrogen blow when brazing.

(Brazing without performing nitrogen replacement or releasing
nitrogen into the piping will create large quantities of oxidized film
on the inside of the pipes, adversely affecting valves and com­pressors in the refrigerating system and preventing normal oper­ation.)

• Do not use a flux when brazing the refrigerant pipe joints.

Use phosphor copper brazing (B-Cu93P-710/795: ISO 3677)
which does not require flux.
(Flux has an extremely negative effect on refrigerant piping sys­tems. For instance, if chlorine based flux is used, it will cause pipe
corrosion. If the flux contains fluorine, it will damage the refriger­ant oil.)

DANGER

• Use of oxygen could cause an explosion resulting in severe injury

or death. Only use nitrogen gas.

• Refrigerant gas may produce toxic gas if it comes in contact with fire

such as from a fan heater, stove or cooking device. Exposure to this
gas could cause severe injury or death.

NOTE

• The pressure regulator for the nitrogen released when doing the

brazing should be set to 2.9 psig (0.02 MPa) or less.

(Refer to figure 18)

1. Refrigerant piping

2. Location to be brazed

3. Nitrogen

4. Taping

5. Manual valve

6. Regulator

Precautions when connecting pipes

• See the following table for flare part machining dimensions.

• When connecting the flare nuts, apply refrigerant oil to the inside of
the flares and turn them three or four times at first.
(Use ester oil or ether oil.)

• See the following table for tightening torque.
(Applying too much torque may cause the flares to crack.)

• After all the piping has been connected, check the gas leak with
nitrogen.

pipe size

(in.)

φ

3/8

φ

1/2

φ

5/8

tightening torque

(ft.·lbf. (N·m))

24.1 - 29.4
(32.7-39.9)

36.5 - 44.5
(49.5-60.3)

45.6 - 55.6
(61.8-75.4)

A

(in. (mm))

0.504 - 0.520
(12.8-13.2)

0.638 - 0.654
(16.2-16.6)

0.760 - 0.776
(19.3-19.7)

flare shape

(in. (mm))

90˚±2

45˚±2

A

R=0.016-0.031
(0.4-0.8)

Not recommendable but in case of emergency

You must use a torque wrench but if you are obliged to install the unit
without a torque wrench, you may follow the installation method men­tioned below.

After the work is finished, make sure to check that there is no gas
leak.

When you keep on tightening the flare nut with a spanner, there is a
point where the tightening torque suddenly increases. From that posi­tion, further tighten the flare nut the angle shown below:

(Unit: in. (mm))

Pipe size Further tightening angle Recommended arm length of tool

φ

3/8

φ

1/2

φ

5/8

φ

3/4

60 to 90 degrees Approx. 7-7/8 (200)

30 to 60 degrees Approx. 9-13/16 (250)

30 to 60 degrees Approx. 11-13/16 (300)

20 to 35 degrees Approx. 17-3/4 (425)

9-4 Connecting the refrigerant piping

Connect piping to outside unit by using accessory pipes

(Refer to figure 20)

1. Gas side piping

2. (field supply)

3. Gas side accessory pipe (for suction gas (1))

4. Liquid side pipe (field supply)

5. Flare nut (Included in the unit)

6. Accessory pipes (for discharge gas and suction gas (2))

is not used.

7. Piping on discharge gas side (field supply)

8. Piping on suction gas side (field supply)

9. Cut off the hatched area and use it as a cover for the drilled.

10. Hatched area

11. Accessory pipe (for discharge gas)

12. Accessory pipe (for suction gas)

13. Guideline for pipe machining

14. Accessory pipe (for suction gas (2))

15. Brazing

16. Accessory pipe (for suction gas (1))

17. Before fitting to the product, apply brazing.

NOTE

• Be sure to use the attached pipe when carrying out piping work in

the field.

• Be sure that the local piping does not touch other pipes, the bottom
panel or side panel. Especially for the bottom and side connection, be
sure to protect the local piping with the provided insulation, to prevent
it from coming into contact with the casing.

Precautions for installation of units

NOTE

• The outside unit multi connection piping kit that is sold separately as

an option (BHFP22MA56U + 84U, BHFP26MA56U + 84U) is neces­sary for the multi installation of outside units.

• See the installation manual attached to the kit with attention to instal-

lation restrictions described in “connecting the refrigerant piping”
when installing.

〈Cautions for installation of multiple outside units〉

1.

The piping between the outside units must be routed level or slightly
upward to avoid the risk of oil detention to the piping side.

Pattern 1

Pattern 2

to indoor
unit

to indoor
unit

Piping between outside units

3.

If the piping length between the outside unit connection piping kit or
between the outside units exceeds 80 in. (2m), create a rise of 8 in.
(200mm) or more in the gas piping within a length of 80 in. (2m) from
the kit.

If 80 in. (2 m) or less

Piping between outside unit

80 in. (2 m)

to indoor
unit

or less

Change to pattern 1 or pattern 2

Prohibited pattern

to indoor
unit

2.

The gas piping (both discharge and suction gas piping in case of the
heat recovery system) after branched, install without fail a trap of 8
in. or more using the piping included in the piping kit for connecting
the outside unit. Otherwise, the refrigerant may stay within the pip­ing, causing any damage to the outside unit.

Downward
inclination

Oil remains in piping

Downward
inclination

8 in. (200 mm)
or more

Prohibited pattern

No trap has been installed in the gas piping.

to indoor unit

If 80 in. (2 m) or more

to indoor
unit

80 in. (2 m)

or less

Rising height:
8 in. (200 mm)
or more

★Oil may remain in the farthest outside unit.

Change to pattern 1 or pattern 2

9-5 Example of connection

∗ In case of a system of switching between cooling and heating, all systems use 2-tube piping (for suction gas piping and liquid piping). No Branch

Selector unit is required.

8 )

·
Indoor un ts

( 1 - 8 )

Branch Se ector unts

( B1 - B6 )

Coo ng on y

( 7

o

8

H1

H2

n

l

m

REFNET header

j

Heat recovery system

( 1 - 6 )

h

34567

f

gi k

2

a

e

d

1

B1 B2 B3 B4 B5 B6

c

b

Outs de unt

Indoor un ts

( 1 - 8 )

( B1 - B6 )

Branch Se ector unts

Example 3

6 )

·

Coo ng on y

( 5

H2

8

7

o

B

n p

l

B5

m

k

Heat recovery system

( 1 - 4 , 7 · 8 )

j

i

REFNET ont (A·B)

b

A

g

h

23456

B2 B3 B4

f

e

1

B1

Indoor un ts

( 1 - 8 )

c

d

a

H1

REFNET header

Outs de unt

Branch Se ector unts ( B1 - B5 )

Example 2

s

8 )

8

·

Coo ng on y

( 7

H2

H1

r

qom

p

REFNET ont (A-G)

de

B3 B4

n

CDE

c

B2

l

Heat recovery system

( 1 - 6 )

k

234567

b

j

G

i

1

h

Indoor un ts

( 1 - 8 )

B1

g

f

Outs de unt

AB

a

Branch with REFNET joint Branch with REFNET joint and REFNET header Branch with REFNET header

( B1 - B4 )

Branch Se ector unts

Example 1

n

l

m

REFNET header

B6B5B4B3B2B1

j

k

h

f

g

e

d

b

a

Example 6

Indoor un ts

( 1 - 8 )

Branch Se ector unts

( B1 - B5 )

H2

8

p

o

B

REFNET header

n

l

B5

k

j

i

b

A

g

h

B2 B3 B4

f

e

B1

c

d

am

Example 5

s

r

e

q

p

d

REFNET ont (A-G)

o

n

c

l

m

k

j

b

i

1234567

h

FG

B1 B2 B3 B4

g

f

A CD

F rst outsde

a

Example 4

Heat recovery

system ( 1 - 6 )

Coo ng on y

o

8

H1

H2

Outs de

4567

i

123

c

Heat recovery system

( 1 - 4 , 7 · 8 )

H1

7

456

REFNET ont (A·B)

Outs de unt

t

3

2

s

1

r

u

8

H1

H2

H3

Outs de unt

branch

8 )

·

( 7

H3

un t

6 )

·

Coo ng on y

( 5

H3

8 )

·

Coo ng on y

( 7

Heat recovery

system ( 1 - 6 )

Indoor un ts

( 1 - 8 )

( B1 - B4 )

Branch Se ector unts

(Example 3,6) unit 8 : a + o ≤ 390 ft. (120 m)

(Example 2,5) unit 6 : a + b + l ≤ 390 ft. (120 m), 8 : a + m + n + p ≤ 390 ft. (120 m)

Pipe length between outside (∗2) and indoor units ≤ 390 ft. (120 m)

(Example 1,4) unit 8 : a + b + c + d + e + s ≤ 390 ft. (120 m)

Equivalent pipe length between outside (∗2) and indoor units ≤ 459 ft. (140 m) (assume equivalent pipe length of REFNET joint to be 1.6 ft. (0 5 m), hat of REFNET header to be 3.3 ft. (1 m), that of BS(V)Q36,60 is 13 ft. (4 m) and BS(V)Q96 is 19 t. (6 m), that of BS(V)4,6Q is 19 ft. (6 m) and BS8,10,12Q is 33 ft. (10 m) for calculation purposes.)

r ≤ 33 ft. (10 m) (Equivalent length ≤ 43 ft. (13 m))

t

u

Piping length from outside branch to outside unit ≤ 33 ft. (10 m) Equivalent length: max 43 ft. (13 m)

Total piping length from outside unit (∗2) to all indoor units ≤ 980 ft. (300 m)

s

r

Equivalent length ≤ 43 ft. (13 m))

Equivalent length ≤ 43 ft. (13 m))

u+t ≤ 33 ft. (10 m) (

u+s ≤ 33 ft. (10 m) (

Difference in height between outside and indoor units (H1) ≤ 164 ft. (50 m) (Max 130 ft. (40 m) if the outside unit is below)

Difference in height between indoor units (H2) ≤ 49 ft. (15 m)

BHFP22MA56U

KHRP26M33H9

KHRP26M72H9

KHRP26M73HU9

BHFP22MA84U

KHRP26M22H9, KHRP26M33H9

Outside unit

Refrigerant branch kit name

(Example 3,6) unit 8 : o ≤ 130 ft. (40 m) (Example 2,5) unit 6 : b + l ≤ 130 ft. (40 m), 8 :m + n + p ≤ 130 ft. (40 m)

KHRP25M33H9

KHRP25M72H9

KHRP25M73HU9

In case of 3-tube piping In case of 2-tube piping

Indoor

<72

72≤x<111

111≤x<246

246≤

capacity index

down stream of REFNET header.

How to select REFNET header

• Select suitable one from the table below according to the total capacity of indoor units to be connected to the

KHRP26A33T9

KHRP26M72TU9

KHRP26M73TU9

Refrigerant branch kit name

)

KHRP25A33T9

A

KHRP25M72TU9

KHRP25M73TU9

Heat recovery system Heat pump system

Outside unit

capacity type

Choose from the following table in accordance with the capacity of the outside unit.

(Example 1,2,4,5 : REFNET joint

RWEYQ72, 84

RWEYQ144, 168

(Example 1,4) unit 8 : b + c + d + e + s ≤ 130 ft. (40 m)

Difference in height between outside unit (main) and outside unit (sub) (H3) ≤ 6.5 ft. (2 m)

Pipe length from first refrigerant branch kit (either REFNET joint or REFNET header ) to indoor unit ≤ 130 ft. (40 m)

How to select REFNET joint:

• When using REFNET joints at the first branch counted from the outside unit side.

RWEYQ216, 252

BHFP26MA56U

BHFP26MA84U

Heat recovery system Heat pump system

2 units

3 units

of outside unit

Number of units

• Select from the table below according to the number of outside units.

How to select an outside branch kit (Needed when the outside unit type is RWEYQ144 or more.)

KHRP26A22T9

KHRP26A33T9

KHRP26M72TU9

Refrigerant branch kit name

KHRP25A22T9

KHRP25A33T9

KHRP25M72TU9

In case of 3-tube piping In case of 2-tube piping

Indoor

<72

72≤x<111

111≤x<246

capacity index

For REFNET joints other than the first branch, select the proper branch kit model based on the total capacity index.

•

(Unit: in.)

φ 1/4

Liquid pipe

φ 3/8

φ 1/2

Discharge gas pipe

Piping size (outer diameter)

φ 1/2

φ 5/8

Suction gas pipe

Indoor unit

be connected to downstream.

(Example 3,6) In case of REFNET Header,

For the gas piping size in case of 2-tube piping between refrigerant branch kit/Branch

indoor units of 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8

Piping between refrigerant branch kit and refrigerant branch kit/Branch Selector unit

Piping between Branch Selector unit and refrigerant branch kit

• Select one from the table below according to the total capacity of indoor units to

•

(Unit: in.)

Liquid pipe

, indoor units of 7 + 8

B

Discharge gas pipe

capacity type

Selector unit and refrigerant branch k t, select the size of suction gas piping.

under the generic term of the system.

The size of connection piping should not exceed the refrigerant piping size selected

Indoor unit connection piping size

•

<24

φ 3/8

φ 5/8

φ 3/4

24≤x<72

Piping size (outer diameter)

φ 3/4

φ 7/8

Suction gas pipe

KHRP26M73TU9

KHRP25M73TU9

Capacity type

(Example 2,5) In case of REFNET Joint

of outside unit

(Example 2,5) In case of REFNET Header, indoor units of 1 + 2 + 3 + 4 + 5 + 6

Piping between outside branch and outside unit (part C)

(Unit: in.)

Liquid pipe

, indoor units of 5 + 6 + 7 + 8

C

Discharge gas pipe

increase the size of the main pipe of liquid piping side.

RWEYQ72

φ 3/8

φ 5/8

the sizes of discharge and suction gas pipes.

RWEYQ84

Piping size increase in case of long piping

• When the equivalent length is 262.5 ft. (80 m) or more, it is necessary to

• When the equivalent length is 262.5 ft. (80 m) or more, do not increase

φ 1/2

φ 5/8

φ 3/4

φ 3/4

φ 7/8

φ 1-1/8

Piping size (outer diameter)

φ 3/4

φ 7/8

φ 1-1/8

φ 1-3/8

Suction gas pipe

246≤

Capacity type

of outside unit

RWEYQ72

RWEYQ84

RWEYQ144

RWEYQ168

RWEYQ216

Piping between outside unit and refrigerant branch kit (part A)

• Match to the size of connection piping of outside unit

(Example 1,4) In case of REFNET Joint

RWEYQ252

φ 3/8

φ 3/4

φ 7/8

72≤x<111

(Unit: in.) Indoor unit connection piping size

φ 1/2

φ 5/8

φ 3/4

φ 1/4

φ 3/8

Liquid pipeGas pipe

φ 1-1/8

Piping size (outer diameter)

φ 1/2

φ 5/8

φ 1-1/8

φ 1-1/4

Indoor unit

111≤x<162

162≤x<246

capacity type

246≤

07-18 type

Piping between Branch Selector unit (refrigerant branch kit) and indoor unit

• Match to the size of the connection piping on the indoor unit.

24-48 type

(Unit: in.)

φ 1/2

φ 5/8

φ 3/4

φ 7/8

When increasedStandard size

Piping size (outer diameter)

φ 3/8

φ 1/2

φ 5/8

φ 3/4

Capacity type

of outside unit

RWEYQ72,84

RWEYQ144

RWEYQ168,216

(Unit: in.)

RWEYQ252

φ 1/2

φ 5/8

Liquid pipe

Diameter of liquid pipe (main pipe portion)

φ 7/8

Discharge gas pipe

Piping size (outer diameter)

φ 1-1/8

Suction gas pipe

Capacity type

of outside unit

of the outside unit to be connected to upstream

RWEYQ144

Piping between outside branches (part B)

• Select the size from the following table based on the total capacity

RWEYQ168

r:φ 3/8× 3 ft.

t:φ 3/8× 3 ft.

s:φ 3/8× 3 ft.

: φ 1/4×10 ft.

n:φ 1/4×10 ft.

o:φ 1/4×10 ft.

m

i:φ 1/2×10 ft. j:φ 1/4×10 ft.

k:φ 1/4×10 ft.

f:φ 3/8×10 ft.

g:φ 1/4×10 ft.

e:φ 3/8×10 ft.

a:φ 3/4×30 ft.

b:φ 5/8×10 ft.

c:φ 3/8×10 ft.

(Heat recovery system)

If the outside unit is

RWEYQ252 and the

piping lengths are as

Example for refrigerant branch using REFNET joint and REFNET header for RWEYQ252

×0.074 lbs./ft.

(0.12 N·m)

(Unit: lbs. (kg))



φ1/2

iquid piping size at

Total length (ft. (m)) of



Heat recovery system Heat pump system

×0.114 lbs./ft.

(0.18 N·m)



φ5/8

System name

Total length (ft. (m)) of

liquid piping size at



+ +

Corrected

×0.168 lbs./ft.

(0.26 N·m)



3/4

φ

Total length (ft. (m)) of

liquid piping size at



×0.235 lbs./ft.

(0 37 N·m)



7/8

φ

iquid piping size at

Total length (ft. (m)) of



R= +

u:φ 5/8× 1 ft.

p:φ 1/4×10 ft.

23.3 (lbs.)

l:φ 1/4×10 ft.

h:φ 1/4×20 ft.

d:φ 3/8×10 ft.

b+ua c+d+e+f+r+s+t g+h+j+k+l+m+n+o+pi

R= 30 0.168 + 11 0.114 + 10 0.074 + 49 0.036 + 100 0.015 + 13 = 23.298

at right

13 (6)

6.6 (3)

9.9 (4.5)

13 (6)

6.6 (3)

9.9 (4.5)

1 unit (72 / 84)

2 unit multi (144 / 168)

3 unit multi (216 / 252)

volume by

outside unit

+

×0.015 bs./ft.

(0.022 N·m)



φ /4

iquid piping size at

Total length (ft. (m)) of



+

×0.036 lbs. ft.

(0.059 N·m)



φ3/8

Total leng h (ft. (m)) of

liquid piping size at



+

unit installed

Single outside

(RWEYQ72, 84)

Indoor

unit side

Gas p png

L qud p p ng

Discharge gas piping

Suction gas piping

Branch

Selector

unit

L qud p p ng

(3-tube p png) (2-tube p png)

D scharge gas pp ng

Example of connection

(Connection of 8 indoor units Heat pump system)

Outside

unit side

Suct on gas pp ng

(Thick line): 3-tube piping

• Piping between outside unit and Branch Selector unit

installed

outside units

When multiple

Liquid piping

Suction gas piping

Liquid piping

(Thin line): 2-tube piping

[∗]

• Piping between Branch Selector unit and indoor unit,

greater)

(RWEYQ144 or

Actual pipe length

Equivalent length

)

∗

(

and indoor units

Between outside

If the system capacity is RWEYQ144 or more,

re-read the [outside unit] as [the first outside branch

seen from the indoor unit side].

Maximum

allowable

Actual pipe length

Difference in height

Difference in height

Total extension length

length

Difference in height

Between outside branch and outside unit

(In case of RWEYQ144 or more)

Between outside and indoor units

Between indoor and indoor units

Between outside and outside units

Allowable

height

length

Actual pipe length

Refrigerant branch kits can only be

Refrigerant branch kit selection

Allowable length after the branch

used with R410A.

Example of downstream indoor units

For an outside unit multi installation (RWEYQ144, 168, 216, 252 type),

make the settings in accordance with the following figure.

Pipe size selection

Piping between outside branch and outside unit (part C)

Piping between outside branches (part B)

If a negative result is gotten for R from the formula at right,

Piping between outside unit and refrigerant branch kit (part A)

How to calculate the additional refrigerant

to be charged

Additional refrigerant to be charged R (lbs. (kg))

(R should be rounded off in units of 0.1 lbs. (kg))

NOTE:

no refrigerant needs to be added.

9-6 Air tight test and vacuum drying

The units were checked for leaks by the manufacturer.
Confirm that the valves are firmly closed before Air tight test or vacuum
drying.
To prevent entry of any impurities and ensure sufficient pressure resis­tance, always use the special tools dedicated for R410A.

• Air tight test: Make sure to use nitrogen gas.
(For the service port location, refer to the
“Caution” label attached on the front panel
[right] of the outside unit.)

(Refer to figure)

1. [Service Precautions] label

2. Control box cover

3. [Caution] label

Pressurize the liquid and gas pipes to
500 microns (do not pressurize more than
500 microns). If the pressure does not drop
within 24 hours, the system passes the test. If the pressure drops,
check where the nitrogen leaks from.

• Vacuum drying: Use a vacuum pump which can evacuate to
500 microns.

1.

Evacuate the system from the liquid and gas pipes by using a
vacuum pump for more than 2 hours and bring the system to
500 microns or less. After keeping the system under that condi­tion for more than 1 hour, check if the vacuum gauge rises or not.
If it rises, the system may either contain moisture inside or have
leaks.

2.

Following should be executed if there is a possibility of moisture
remaining inside the pipe (if piping work is carried out during the
raining season or over a long period of time rainwater may enter
the pipe during work).
After evacuating the system for 2 hours, pressurize the system to

7.25 psig (0.05 MPa) (vacuum break) with nitrogen gas and evac­uate the system again using the vacuum pump for 1 hour to
500 microns or less (vacuum drying). If the system cannot be
evacuated to 500 microns within 2 hours, repeat the operation of
vacuum break and vacuum drying.
Then, after leaving the system in vacuum for 1 hour, confirm that
the vacuum gauge does not rise.

NOTE

Make sure to perform air tight test and vacuum drying using the service
ports of the stop valve shown in the table below.

One outside unit installed

Multiple outside units installed

Liquid pipe stop valve
Discharge gas pipe stop valve
Suction gas pipe stop valve

Liquid pipe stop valve
Discharge gas pipe stop valve
Suction gas pipe stop valve
Oil-equalizing pipe stop valve

1

2

9-7 Pipe insulation

After finishing the leak test and vacuum drying, the piping must be insu­lated. Take into account the following points:

• Make sure to insulate the connection piping and refrigerant branch
kits entirely.

• Be sure to insulate the liquid-side, suction gas-side and discharge
gas-side piping for the inter-unit piping and the refrigerant branch kits.
Not insulating them may cause leaking. (The gas piping can reach
temperatures of 250°F (120°C). Be sure the insulation used can
withstand such temperatures.)

• If you think the humidity around the cooling piping might exceed
86°F (30°C) and RH80%, reinforce the insulation on the cooling pip­ing (at least 13/16 in. (20 mm) thick). Condensation might form on
the surface of the insulation.

• If there is a possibility that condensation on the stop valve might drip
down into the indoor unit through gaps in the insulation and piping
because the outside unit is located higher than the indoor unit, etc.,
this must be prevented by caulking the connections, etc.

WARNING

• Be sure to insulate connection piping, as touching them can cause

burns.

9-8 Checking of device and installation conditions

Be sure to check the followings.

1.

Make sure there is no faulty power supply wiring or loosing of a nut.
See 8. FIELD WIRING.

2.

Make sure there is no faulty transmission wiring or loosing of a nut.
See 8. FIELD WIRING.

3.

Make sure there is no faulty refrigerant piping.
See 9. REFRIGERANT PIPING.

4.

Make sure piping size is correct.
See 9-1 Selection of piping material.

5.

Make sure insulation work is done.
See 9-7 Pipe insulation.

6.

3

Make sure insulation resistance of main power supply circuit is not
deteriorated.
Using a megatester for 500 V, check that the insulation resistance of
2MΩ or more is attained by applying a voltage of 500 V DC between
power supply and ground terminals. Never use the megatester for
the transmission wiring (between outside and indoor unit, outside
and Cool/Heat selector and etc.).

9-9 Additional refrigerant charge

WARNING

• To avoid injury always use protective gloves and eye protection
when charging refrigerant.

• To avoid injury do not charge with unsuitable substances. Use only
the appropriate refrigerant.

NOTE

• Refrigerant cannot be charged until field wiring has been com-

pleted.
Refrigerant may only be charged after performing the leak test and
the vacuum drying (see above).
When charging a system, care shall be taken that its maximum per­missible charge is never exceeded, in view of the danger of liquid
hammer.
Refrigerant containers shall be opened slowly.

TO AVOID COMPRESSOR BREAKDOWN. DO NOT CHARGE THE
REFRIGERANT MORE THAN THE SPECIFIED AMOUNT TO RAISE
THE CONDENSING PRESSURE.

• This outside unit is factory charged with refrigerant and depending

on pipe sizes and pipe lengths some systems require additional
charging of refrigerant.

• Determine the amount of refrigerant to be added by referring to the

table, write it down on the included “Added Refrigerant” plate and
attach it to the rear side of the front cover.
Note: refer to the example of connection for the amount to be added.

Additional refrigerant charge procedure (1)-normally

• Charge the refrigerant to the liquid pipe in its liquid state. Since

R410A is a mixed refrigerant, its composition changes if charged in
a state of gas and normal system operation would no longer be
assured.

• Make sure to use installation tools you exclusively use on R410A

installations to withstand the pressure and to prevent foreign materi­als from mixing into the system.

1.

Before charging, check whether the tank has a siphon attached or not.

How to charge with the siphon tank.

Charge with the tank upright.

There is a siphon tube
inside, so there is no need
to turn the tank upside-down.

Other ways of charging with the tank.

Charge with the tank upside-down.

2.

After the vacuum drying is finished, charge the additional refrigerant
in its liquid state through the liquid pipe stop valve service port. Tak­ing into account following instructions:

• Check that gas and liquid pipe stop valves are closed.

• Stop the compressor and charge the specified weight of refriger-

ant.
(If the outside unit is not in operation and the total amount cannot be
charged, follow the Additional refrigerant charge procedure (2)
shown below.)

NOTE

• Procedures for charging additional refrigerant.
(Refer to figure 24)

1. Pressure reducing valve

2. Nitrogen

3. Refrigerant tank

4. With a siphon

5. Measuring instrument

6. Vacuum pump

7. Va l ve A

8. Va l ve B

9. Charge hose

10. Outside unit

11. Gas side

12. Liquid side

13. Discharge gas side

14. Suction gas side

15. Stop valve service port

16. To indoor unit

17. To indoor units / Branch Selector units

18. Dotted lines represent onsite piping

Additional refrigerant charge procedure (2)-by Additional refriger­ant charge operation

To learn the system settings for additional refrigerant charging, refer to
the [Service Precautions] label attached on the back of the control box
cover in the outside unit.

1.

Fully open all stop valves (valve A and valve B must be left
fully closed).

2.

After ten minutes, fully close liquid pipe stop valve and then, open
the valve by turning 180°.
Start the additional refrigerant charge operation.
See [Service Precautions] label for detail.
If it is difficult to charge the refrigerant additionally, decrease the
water temperature or warm the refrigerant tank.
(Warm the refrigerant tank with a stupe or a warm hot water of
104°F (40°C) or less.)

3.

After the system is charged with a specified amount of refrigerant,
press the RETURN button (BS3) on the printed circuit board (A1P)
in the outside unit to stop the additional refrigerant charge operation.

4.

Immediately open both liquid and gas pipe stop valve.
(If the stop valve is not opened immediately, liquid seal may
cause the pipes to burst.)

NOTE

• If the refrigerant cylinder is siphonal, set it upright while charging

additional refrigerant.

9-10 Stop valve operation procedure

CAUTION

Do not open the stop valve until 1-6 of “9-8 Checking of device and
installation conditions” are completed. If the stop valve is left open
without turning on power supply, it may cause refrigerant to buildup
in the compressor, leading to insulation degradation.

Opening stop valve

1.

Remove the cap and turn the valve counterclockwise with the hexa­gon wrench.

2.

Turn it until the shaft stops.
Do not apply excessive force to the stop valve. Doing so may break
the valve body, as the valve is not a backseat type. Always use the
special tool.

3.

Make sure to tighten the cap securely.

Closing stop valve

1.

Remove the cap and turn the valve clockwise with the hexagon
wrench.

2.

Securely tighten the valve until the shaft contacts the main body
seal.

3.

Make sure to tighten the cap securely.
∗ For the tightening torque, refer to the table on the below.

Tightening torque

Stop

valve size

Liquid

side

Gas
side

(Refer to figure 25)

〈Caution〉

• Do not damage the cap sealing.

• Always use a charge hose for service port connection.

• After tightening the cap, check that no refrigerant leaks are present.

• After working, securely tighten the cover of service port without fail
by specified torque.

• When loosening a flare nut, always use two wrenches in combina­tion. When connecting the piping, always use a spanner and torque
wrench in combination to tighten the flare nut.

• When connecting a flare nut, coat the flare (inner and outer faces)
with ether oil or ester oil and hand-tighten the nut 3 to 4 turns as the
initial tightening.

• Do not forget to open the stop valve before starting operation.

(Refer to figure 26)

Tightening torque (ft.·lbf. (N·m)) (Turn clockwise to close)

(valve body)

3.98-4.87
(5.4-6.6)

19.91-24.33
(27-33)

Shaft

Hexagonal

wrench

1/8 in. (4 mm)

Hexagonal

wrench

3/8 in. (10 mm)

Cap

(valve

cover)

9.95-12.17

(13.5-16.5)

26.54-32.44
(36-44)

Service port

8.48-10.25
(11.5-13.9)

8.48-10.25
(11.5-13.9)

Flare nut

24.1-29.4

(32.7-39.9)

_

Gas side

accessory

pipe (1)

_

16.22-20.65
(22-28)

1. Service port

2. Cap

3. Hexagon hole

4. Shaft

5. The main body seal

1. Remove the cap and turn the valve counterclockwise with

the hexagon wrenches until it stops.

2. Discharge gas side

3. Liquid side

4. Suction gas side

5. Never remove the partition flange for any reason.

6. Full close on the suction gas side

10. CHECKS AFTER INSTALLATION

WARNING

• Never connect power supply wiring to the terminal block for remote
controller wiring as this could damage the entire system.

• Attach the power supply wire securely.

• To avoid injury, always make sure that the circuit breaker on the power

supply panel of the installation is switched off before doing any work.

After the installation, check the following before switching on the circuit
breaker:

1.

The position of the switches that requires an initial setting
Make sure that switches are set according to your application needs
before turning the power supply on.

2.

Power supply wiring and transmission wiring
Use a designated power supply and transmission wiring and make
sure that it has been carried out according to the instructions
described in this manual, the wiring diagrams and local and national
regulations.

3.

Pipe sizes and pipe insulation
Make sure that correct pipe sizes are installed and that the insulation
work is properly executed.

4.

Additional refrigerant charge
The amount of refrigerant to be added to the unit should be written
on the included “Additional Refrigerant” label, and attach it to the
rear side of the front cover.

5.

Measurement of insulation in main power supply circuit
Using a megatester for 500 V, check that the insulation resistance of
2MΩ or more is attained by applying a voltage of 500 V DC between
power supply and ground terminals. Never use the megatester for
the transmission wiring.

6.

Installation date
Be sure to keep record of the installation date on the “Additional
Refrigerant” label.

11. TEST RUN

CAUTION

After completing installation, be sure to open the valves.
(Operating the unit with the valves shut will break the compressor.)

11-1 Air discharge

• Running the heat source water pump, carry out air discharge

process until the water comes out from the air discharge hole of local
piping.
(For the operation to be done for the first time after installation, you
need to perform a checking operation.)

11-2 Before turn on the power supply

• Close the control box cover securely before turning on power supply.

• Make settings for outside unit printed circuit board (A1P) after turn-

ing on the power supply and check the LED display from inspection
door that is on the control box cover.

11-3 Check operation

When running the unit for the first time after installation, be sure to per­form a test operation following these steps. (Not performing a test oper­ation when the unit is first installed may prevent the unit from operating
properly.)

• During the operation, monitor the outside unit operation status and

check for any incorrect wiring.

(1) Check the connection of interlock

circuit

(2)• As necessary, configure the system

settings onsite by using the
dipswitch (DS1) on the outside unit
printed circuit board (A1P) and push
button switches (BS1 to 5).

• When the system is in the multiple­outside unit configuration, perform
the configuration on the main unit.
(Any settings made on a sub unit
will be ignored.)

After this, close the control box cover.

(3) Turn ON the power supply to the out-

side units and indoor units.

(4) Star t the heat source water pump

and fill the heat source water in the
outside unit.

Make sure that the temperature of

(5)

heat source water is kept within the
operation range (50-113°F (10-45°C)).

(6) Check the LED on the printed circuit board (A1P) in the outside unit to see if the

data transmission is performed normally.

LED display
(Default status
before delivery)

One outside unit installed

When multiple
outside unit

∗

)

installed (

(∗) The base (main) unit is the outside unit to which the interconnecting wiring for the

indoor units is connected. The other outside units are sub units.

(7)• Using the push button switches

(BS1 - 5) on the pr inted circuit board
(A1P) of outside unit, carr y out a
local setting, if necessary.

• When the system is in the multiple­outside unit configuration, perform
the configuration on the main unit.
(Any settings made on a sub unit
will be ignored.)

(8) Check all stop valves are opened.

If some stop valve is closed, open
them.
(Refer to 9-10 Stop valve operation
procedure.)

(9)Perform the check operation following

the instructions printed on the
[Service Precautions] label.

Microcomputer
operation
monitor

Master station
Sub station 1
Sub station 2

HAP H1P H2P H3P H4P H5P H6P H7P H8P

The outside unit cannot be operated if the
interlock circuit has not been connected.

Always perform configuration after tur ning
ON the power supply. To learn the setting
method, refer to the [Service Precautions]
label attached at the position shown in the
figure on the right
(Control box cover in outside unit).
(Remember, the actual settings you have
made must be recorded on the [Service
Precautions] label.)

Make sure to turn ON the power supply
6 hours before starting the operation. This
is necessary to warm the crankcase prelim­inarily by the electric heater.

The outside unit cannot be operated if the
heat source water pump is not r unning.

The outside unit cannot be operated at a
temperature outside the operation range.

Ready/

Page

Cooler/heater changeover

Error

Bulk

Individual

Always perform configuration after tur ning
ON the power supply. To learn the setting
method, refer to the [Service Precautions]
label attached at the position shown in the
figure on the right
(Control box cover in outside unit).
(Remember, the actual settings you have
made must be recorded on the [Service
Precautions] label.)

[CAUTION]

Do not leave any stop valve closed.
Otherwise the compressor will fail.
For Heat recovery system of cooling and
heating:
Open all stop valves on the suction side,
discharge gas side and liquid side.
For cooling and heating switching operation
system:
Open the stop valves on discharge gas side
and liquid side. (Keep the stop valve on

suction side fully closed.)

If you push the test run button (BS4) on the
printed circuit board (A1P) of the outside
unit for 5seconds, the test run star ts.
If you want to interrupt the test run, push
the RETURN button (BS3) on pr inted circuit
board (A1P). The system continues resid­ual operation for about 1 minute (maximum
10 minutes) and then stops.
(During test run, you cannot stop it by a
command from a remote controller.)

You need to perform the above settings
on the printed circuit board by access­ing the printed circuit board through the
inspection door on the control box
cover.

Bulk

(main)

(sub)

LED display: OFF ON Blinking

Low
noise

Demand

Multi

(Refer to figure 27)

1. Control box

2. Control box cover

3. Inspection door

4. [Service Precautions] label

〈Cautions for check operation〉

• If the system is started within about 12 minutes after the outside/
indoor units are turned ON, the compressor will not run and H2P
lights up. Before starting an operation, always verify that the LED dis­play shows the contents of the table in 11-3 Check operation (6).

• The system may require up to 10 minutes until it can start the com­pressor after an operation start. This is a normal operation to equal­ize the refrigerant distribution.

• The check operation does not provide any means of checking the
indoor units individually. For that purpose, perform normal operation
using the remote controller after the check operation.
Check operation is not possible in other modes such as collection mode.

•

• If the setting of indoor remote controller is changed before the check
operation, it may not be performed correctly and malfunction code
“UF” may be displayed.

Remote controller displays malfunction code

Malfunc-

tion code

E3
E4
F3

F6
UF
U2

U1

U1
U2
U4

U7
UA

UF

E3

F6
UF
U2

E4

F3

U7
UF

UF

E4

HJ

U3

Installation error Remedial action

The stop valve of an out­side unit is left closed.

The phases of the power
supply to the outside
units are reversed.

No power is supplied to an
outside, Branch Selector
or indoor unit (including
phase interruption).

•

A model which cannot be
connected in a multi-out­side-unit system has
been connected in a
multi-outside-unit system.

• DIP switch setting of
Branch Selector unit is
incorrect.

• Combination with T
type (BSQ-TVJ, BS­Q54TVJ) and P
type(BSVQ-PVJU,
BSV-Q36PVJU) cause
error.

Incorrect transmission
between units

Refrigerant overcharge

Insufficient refrigerant

If the multi-outside-unit termi­nal is connected when there
is one outside unit installed.

The operation mode on
the remote controller was
changed before the check
operation.
The heat source water is
not circulating.

The check operation has
not been performed.

Open the stop valve.
Check referring to the table in

9-9 Additional refrigerant
charge.

Exchange two of the three
phases (L1, L2, L3) to make a
positive phase connection.
Check if the power supply wiring for the
outside units are connected correctly.
(If the power supply wire is not con­nected to L2 phase, no malfunction
display will appear and the com­pressor will not work.)
Check if the ground fault circuit
interrupter in the outside unit is ON.

Change to individual piping, and

•

disconnect the wiring from the
multi-outside-unit terminals (Q1,
Q2).

•

Set up a DIP switch referring to
service precautions of Branch
Selector unit.

•

Configure the system with only T
type, or only P type.

Check if the refrigerant piping
and the unit transmission wiring
are consistent with each other.

Recalculate the required
amount of refrigerant from the
piping length and correct the
refrigerant charge level by
recovering any excessive refrig­erant with a refrigerant recovery
machine.

• Check if the additional refrig­erant charge has been fin­ished correctly.

• Recalculate the required
amount of refrigerant from the
piping length and add an ade­quate amount of refrigerant.

Remove the wiring from the
multi-outside-unit terminals (Q1,
Q2).

Set the operation mode on all
indoor unit remote controllers to
“cooling.”

Make sure that the water pump
is running.

Perform the check operation.

E3 is activated, so On/Off but­ton is pressed on the remote
controller, but this does not

E2

tu r n E3 o ff. Or E 2 is act ivated .

E3

In case of above, there is a
malfunction of the compres­sor in the outside unit.

Measure the insulation resis­tance of the compressor to
check the condition of the com­pressor.

11-4 Check of normal operation

After the check operation is completed, operate the unit normally.
Check the below items.

Make sure the indoor and outside units are operating normally (If a

•

knocking sound can be heard in the liquid compression of the com­pressor, stop the unit immediately and then energize the heater for a
sufficient length of time before restarting the operation.)

• Run each indoor unit one at a time and make sure the corre­sponding outside unit is also running.

• Check to see if cold (or hot) air is coming out of the indoor unit.

• Press the fan direction and fan strength buttons on the indoor unit

to check if they operate properly.

NOTE

〈Cautions for normal operation check〉

• Once stopped, the compressor will not restart in about 5 minutes

even if the On/Off button of an indoor unit in the same system is
pressed.
When the system operation is stopped by the remote controller, the out-

•

side units may continue operating for further 5 minutes at maximum.

• If the system has not undergone any check operation by the test
operation button since it was first installed, an malfunction code
“U3” is displayed. In this case, perform check operation referring
to 11-3 Check operation.

• After the test operation, when handing the unit over to the cus­tomer, make sure the control box cover, the inspection door, and
the unit casing are all attached.

12. ONSITE SETTINGS

12-1 Energy saving and optimum operation

This VRV pump system is equipped with advanced energy saving func­tionality. Depending on the priority, emphasizes can be put on energy
saving or comfort level. Several parameters can be selected, resulting in
the optimal balance between energy consumption and comfort for the
particular application.

[2-8]= Te target temperature during cooling operation

Default value=5

Te setting (cooling operation)

2. 43°F (6°C)

3. 45°F (7°C)

hhkhhh

k

Change [2-8]=2-7 in function of required operation method dur­ing cooling.

[2-9]= Tc target temperature during heating operation

Default value=3

hhkhhh

k

Change [2-9]=1, 3 or 6 in function of required operation method
during heating.

4. 46°F (8°C)

5. 48°F (9°C)(default)

6. 50°F (10°C)

7. 52°F (11°C)

Tc setting (heating operation)

1. 106°F (41°C)

3. 109°F (43°C)(default)

6. 115°F (46°C)

hhhhkh

k

hhhh

k

hhhkhh

k

hhhkh

k

hhhkkh

k

hhh

k

k
k
k

kkk

hhhhh
hhhh
hhhkkh

kk

k

k

kk

∗

∗

[2-49]= Te target temperature during simultaneous operation

Default value=5

Te setting (simultaneous operation)

2. 43°F (6°C)

3. 45°F (7°C)

hhh

kkk

Change [2-49]=2-7 in function of required operation method
during simultaneous operation.

[2-51]= Cooling comfort setting

Default value=1

kkkhhkk

Change [2-51]=0, 1, 2 or 3 in function of required limitation.
This setting is used in conjunction with setting [2-8].

[2-52]= Heating comfort setting

Default value=1

kkkhk

Change [2-52]=0, 1, 2 or 3 in function of required limitation.
This setting is used in conjunction with setting [2-9].

Several patterns are available and explained below. Modify the param­eters to the needs of your building and to realize the best balance
between energy consumption and comfort.

4. 46°F (8°C)

k

5. 48°F (9°C)(default)

6. 50°F (10°C)

7. 52°F (11°C)

Cooling comfort setting

0. Eco

1. Mild (default)

2. Quick

3. Powerful

Heating comfort setting

0. Eco

1. Mild (default)

hh

2. Quick

3. Powerful

hhhhkh

k

hhhh

k

hhhkhh

k

hhhkh

k

hhhkkh

k

hhh

k

hhhhhh

k

hhhhh

k

hhhhkh

k

hhhh

k

hhhhhh

k

hhhhh

k

hhhhkh

k

hhhh

k

kk

k

kkk

k

kk

k

kk

12-1-1 Two main operation methods are available:

• Automatic
The refrigerant temperature is set by default to a certain start value
(defined by field setting). Depending on the load of the indoor units,
the refrigerant temperature is adjusted. When there is a big/small
load, according behaviour to match this load is executed.
Depending on the operation mode (cooling, heating or heat recov­ery), field settings are available to define the standard refrigerant
temperature start point. They are explained below.
E.g., when your system is operating in cooling, you do not need as
much cooling under low ambient temperatures (e.g., 77°F (25°C)) as
under high ambient temperatures (e.g., 95°F (35°C)).
Using this idea, the system automatically starts increasing its refrig­erant temperature, automatically reducing the delivered capacity
and increasing the system's efficiency based on indoor unit load
feedback.

• To define the start value during cooling operation, change field
setting [2-8] = 5 (default; corresponding to Te = 48°F (9°C) to the
required value).

E.g., when your system is operating in heating, you do not need as
much heating under high ambient temperatures (e.g., 59°F (15°C))
as under low ambient temperatures (e.g., 23°F (–5°C)).
Using this idea, the system automatically starts decreasing its refrig­erant temperature, automatically reducing the delivered capacity
and increasing the system’s efficiency.

• To define the start value during heating operation, change field
setting [2-9] = 3 (default; corresponding to Tc = 109°F (43°C) to
the required value).

When the system is used as a heat recovery system, the start refrig­erant temperature during heat recovery mode for cooling can be
selected differently than during cooling operation.
To define the start value for cooling operation during heat recovery
operation, change field setting [2-49] = 5 (default; corresponding to
Te = 48°F (9°C) to the required value).

• Hi-sensible/economic (cooling/heating)
The refrigerant temperature is set higher/lower (cooling/heating)
compared to basic operation. The focus under high sensible mode is
comfort feeling for the customer.
The selection method of indoor units is important and has to be con­sidered as the available capacity is not the same as under basic
operation. For details concerning to Hi-sensible applications, please

∗

∗

contact your dealer.

• To activate this setting under cooling operation, change field set­ting [2-8] to the appropriate value, matching the requirements of
the pre-designed system containing a high sensible solution.

Value [2-8] Te target

3 45°F (7°C)
4 46°F (8°C)
5 48°F (9°C)
6 50°F (10°C)
7 52°F (11°C)

• To activate this setting under heating operation, change field set­ting [2-9] to the appropriate value, matching the requirements of
the pre-designed system containing a high sensible solution.

Value [2-9] Tc target

1 106°F (41°C)
3 109°F (43°C)

To maintain the target settings, it is required to set the comfort setting to
Eco.
The comfort modes are explained below.

12-1-2 Several comfort settings are available

For each of above modes a comfort level can be selected. The comfort

∗

level is related to the timing and the effort (energy consumption) which
is put in achieving a certain room temperature by temporarily changing
the refrigerant temperature to different values in order to achieve
requested conditions more quickly.

• Powerful
Overshoot (during heating operation) or undershoot (during cooling
operation) is allowed compared to the requested refrigerant temper­ature, in order to achieve the required room temperature very fast.
The overshoot is allowed from the start up moment.
In case of cooling operation the evaporating temperature is allowed
to go down to 37°F (3°C) on temporary base depending on the situ­ation.
In case of heating operation the condense temperature is allowed to
go up to 120°F (49°C) on temporary base depending on the situa­tion.
When the request from the indoor units becomes more moderate,
the system will eventually go to the steady state condition which is
defined by the operation method above.

• To activate the powerful comfort setting under cooling operation,
change field setting [2-51]=3.
This setting is used in conjunction with setting [2-8].

• To activate the powerful comfort setting under heating operation,
change field setting [2-52]=3.
This setting is used in conjunction with setting [2-9].

• Quick
Overshoot (during heating operation) or undershoot (during cooling
operation) is allowed compared to the requested refrigerant temper­ature, in order to achieve the required room temperature very fast.
The overshoot is allowed from the start up moment.
In case of cooling operation the evaporating temperature is allowed
to go down to 43°F (6°C) on temporary base depending on the situ­ation.
In case of heating operation the condense temperature is allowed to
go up to 115°F (46°C) on temporary base depending on the situa­tion.
When the request from the indoor units becomes more moderate,
the system will eventually go to the steady state condition which is
defined by the operation method above.

• To activate the quick comfort setting under cooling operation,
change field setting [2-51]=2.
This setting is used in conjunction with setting [2-8].

• To activate the quick comfort setting under heating operation,
change field setting [2-52]=2.
This setting is used in conjunction with setting [2-9].

• Mild
Overshoot (during heating operation) or undershoot (during cooling
operation) is allowed compared to the requested refrigerant temper­ature, in order to achieve the required room temperature very fast.
The overshoot is not allowed from the start up moment. The start up
occurs under the condition which is defined by the operation mode
above.
In case of cooling operation the evaporating temperature is allowed
to go down to 43°F (6°C) on temporary base depending on the situ­ation.
In case of heating operation the condense temperature is allowed to
go up to 115°F (46°C) on temporary base depending on the situa­tion.
When the request from the indoor units becomes more moderate,
the system will eventually go to the steady state condition which is
defined by the operation method above.
The start up condition is different from the powerful and quick com­fort setting.

• To activate the mild comfort setting under cooling operation,
change field setting [2-51]=1.
This setting is used in conjunction with setting [2-8].

• To activate the mild comfort setting under heating operation,
change field setting [2-52]=1.
This setting is used in conjunction with setting [2-9].

• Eco
The original refrigerant temperature target, which is defined by the
operation method (see above) is kept without any correction, unless
for protection control.

• To activate the mild comfort setting under cooling operation,
change field setting [2-51]=0.
This setting is used in conjunction with setting [2-8].

• To activate the mild comfort setting under heating operation,
change field setting [2-52]=0.
This setting is used in conjunction with setting [2-9].

Example: Room temperature evolution during cooling

D

E

F

A

BC

A Indoor unit set temperature

B Operation start

C Operating time

D Mild

E Quick

F Power fu l

Example: Room temperature evolution during heating

A

EF

D

BC

A Indoor unit set temperature

B Operation start

C Operating time

D Mild

E Quick

F Power fu l

No matter which control is selected, variations on the behavior of the
system are still possible due to protection controls to keep the unit oper­ating under reliable conditions. The intentional target, however, is fixed
and will be used to obtain the best balance between energy consump­tion and comfort, depending on the application type.

13. CAUTION FOR REFRIGERANT LEAKS

DANGER

• Refrigerant gas is heavier than air and replaces oxygen. A massive

leak could lead to oxygen depletion, especially in basements, and
an asphyxiation hazard could occur leading to serious injury or
death.

Calculate the smallest room volume (ft.3 (m3))

2.

In case like the following, calculate the volume of (A), (B) as a single
room or as the smallest room.

Where there are no smaller room divisions

A.

(Points to note in connection with refrigerant leaks)

Introduction

The installer and system specialist shall secure safety against
leakage according to local regulations or standards. The following
standards may be applicable if local regulations are not available.

The VRV System, like other air conditioning systems, uses R410A as
refrigerant. R410A itself is an entirely safe non-toxic, non-combustible
refrigerant. Nevertheless care must be taken to ensure that air condi­tioning facilities are installed in a room which is sufficiently large. This
assures that the maximum concentration level of refrigerant gas is not
exceeded, in the unlikely event of major leak in the system and this in
accordance to the local applicable regulations and standards.

Maximum concentration level

The maximum charge of refrigerant and the calculation of the maximum
concentration of refrigerant is directly related to the humanly occupied
space in to which it could leak.

3

The unit of measurement of the concentration is lbs./ft.
weight in lbs. (kg) of the refrigerant gas in 1 ft.

occupied space).

Compliance to the local applicable regulations and standards for the
maximum allowable concentration level is required.

1. direction of the refrigerant flow

2. room where refrigerant leak has occurred (outflow of all the

refrigerant from the system)

Pay a special attention to the place, such as a basement, etc.
where refrigerant can stay, since refrigerant is heavier than air.

Procedure for checking maximum concentration

Check the maximum concentration level in accordance with steps 1 to 4
below and take whatever action is necessary to comply.

Calculate the amount of refrigerant (lbs. (kg)) charged to each sys-

1.

tem separately.

amount of refriger­ant in a single unit
system (amount of
refrigerant with
which the system
is charged before
leaving the factory)

NOTE

• Where a single refrigerant facility is divided into 2 entirely indepen-

dent refrigerant systems then use the amount of refrigerant with
which each separate system is charged.

additional charging
amount (amount of

+

refrigerant added
locally in accordance
with the length or
diameter of the refrig­erant piping)

3

(1 m3)

(kg/m3) (the

volume of the

1

2

total amount
of refriger-

=

ant (lbs. (kg))
in the system

Where there is a room division but there is an opening

B.

between the rooms sufficiently large to permit a free flow of
air back and forth.

1

2

1. opening between rooms

2. partition

(Where there is an opening without a door or where there are open­ings above and below the door which are each equivalent in size to

0.15% or more of the floor area.)
Calculating the refrigerant density using the results of the calcula-

3.

tions in steps 1 and 2 above.

total volume of refrigerant in the
refrigerant system

3 (m3

size (ft.
which there is an indoor unit
installed

If the result of the above calculation exceeds the maximum concen­tration level then make similar calculations for the second then third
smallest room and so until the result falls short of the maximum con­centration.

Dealing with the situations where the result exceeds the maximum

4.

concentration level.
Where the installation of a facility results in a concentration in excess
of the maximum concentration level then it will be necessary to
revise the system. Please consult your Daikin supplier.

)) of smallest room in

maximum concen-

≤

tration level
(lbs./ft.

3

(kg/m3))

3P365916-17C EM14A009A

(1503)

HT