Technibel CAFM75R, CAFM1V124R, CAFM1V94R, CAFM1V74R, CAFM1VS94R Technical Data Manual

TECHNICAL DATA

MINI MULTISET V.R.F. DC INVERTER R410A

OUTDOOR UNITS

April 2008

CAFM1V

CAFM1VS

CAFM2V

CAFM

MAFM

SPAFM

DSAFM

DSAFMHP

KFM

KFMNC

GRFMI
GRFM

K

Models R410A
Indoor units

Indoor unit type

CAFM1V**

CAFM1VS**

CAFM2V**

CAFM*

MAFM

SPAFM

DSAFM

DSAFMHP

**

KFM**

KFMNC**

KPAFM*

SDAFM*

1-Way Air Discharge

semi-concealed

Wall-mounted

Ceiling-mounted

Concealed-Duct

Floor standing

Concealed-Floor

Floor standing

Slim Ducted l

7 9 12 16 18 22 25 36 48

CAFM1V74R CAFM1V94R CAFM1V124R

CAFM1VS94R CAFM1VS124R CAFM1VS184R CAFM1VS254R

CAFM1VS74R CAFM2V94R CAFM2V124R CAFM2V184R CAFM2V254R

CAFM75R CAFM95R CAFM125R CAFM165R CAFM185R CAFM255R CAFM365R CAFM485R

MAFM75R MAFM95R MAFM125R MAFM185R MAFM255R

SPAFM124R** SPAFM184R** SPAFM255R SPAFM365R SPAFM485R

DSAFM75R* DSAFM95R* DSAFM125R* DSAFM165R* DSAFM185R* DSAFM225R* DSAFM255R DSAFM365R DSAFM485R

DSAFMHP254R DSAFMHP364R DSAFMHP484R

KFM74R KFM94R KFM124R KFM184R KFM254R

KFMNC74R KFMNC94R KFMNC124R KFMNC184R KFMNC254R

KPAPM75R KPAFM95R KPAPM125R KPAFM165R KPAFM185R KPAFM225R

SDAFM76R SDAFM96R SDAFM126R SDAFM166R SDAFM186R SDAFM226R

Outdoor units

Optional controllers

Refrigerant R410A is used in the Outdoor units .

Wired Remote Controller K70D036Z
Wireless Remote Controller (for CAFM type) K70D037Z
Wireless Remote Controller (for KPAFM type) K70D038Z
Wireless Remote Controller (for SP

AFM type)

K70D040Z

Wireless Remote Controller+receiver for all types of Indoor units

K70D039Z
Wireless Remote Controller (for MAFM type) K70D041Z
Simplified Remote Controller K70D042Z
Remote sensor K70D050Z

System Controller K70D043Z
Schedule timer K70D046Z

K

* For these types of Indoor unit, please see the Installation Instructions accompanying the unit
** These types of Indoor unit are not available

MINI-MULTISET System - DC Inverter

Line-up

1-Way Air Discharge
semi-concealed slim

2-Way Air Discharge

semi-concealed

4-Way Air Discharge

semi-concealed

Concealed-Duct
high static pressure

standing

GRFMI

DC Inverter Unit

GRFMI306R5I, GRFMI406R5I, GRFMI506R5I

i

IMPORTANT!
Please Read Before Starting

This air conditioning system meets strict safety and operat­ing standards. As the installer or service person, it is an
important part of your job to install or service the system so it
operates safely and efficiently.

For safe installation and trouble-free operation, you must:

●

Carefully read this instruction booklet before beginning.

●

Follow each installation or repair step exactly as shown.

●

Observe all local, state, and national electrical codes.

●

This product is intended for professional use.
Permission from the power supplier is required when
installing an outdoor unit that is connected to a 16 A
distribution network.

●

Pay close attention to all warning and caution notices
given in this manual.

This symbol refers to a hazard or
unsafe practice which can result
in severe personal injury or death.

This symbol refers to a hazard or
unsafe practice which can result
in personal injury or product or
property damage.

If Necessary, Get Help

These instructions are all you need for most installation
sites and maintenance conditions. If you require help for a
special problem, contact our sales/service outlet or your
certified dealer for additional instructions.

In Case of Improper Installation

The manufacturer shall in no way be responsible for
improper installation or maintenance service, including fail­ure to follow the instructions in this document.

SPECIAL PRECAUTIONS

When Wiring

ELECTRICAL SHOCK CAN CAUSE
SEVERE PERSONAL INJURY OR DEATH.
ONLY A QUALIFIED, EXPERIENCED
ELECTRICIAN SHOULD ATTEMPT TO
WIRE THIS SYSTEM.

• Do not supply power to the unit until all wiring and tubing
are completed or reconnected and checked.

• Highly dangerous electrical voltages are used in this sys­tem. Carefully refer to the wiring diagram and these
instructions when wiring. Improper connections and inad­equate grounding can cause accidental injury or death.

• Ground the unit following local electrical codes.

• Connect all wiring tightly. Loose wiring may cause over­heating at connection points and a possible fire hazard.

When Transporting

Be careful when picking up and moving the indoor and outdoor
units. Get a partner to help, and bend your knees when lifting
to reduce strain on your back. Sharp edges or thin aluminum
fins on the air conditioner can cut your fingers.

When Installing…

…In a Room

Properly insulate any tubing run inside a room to prevent
“sweating” that can cause dripping and water damage to
walls and floors.

…In Moist or Uneven Locations

Use a raised concrete pad or concrete blocks to provide a
solid, level foundation for the outdoor unit. This prevents
water damage and abnormal vibration.

…In an Area with High Winds

Securely anchor the outdoor unit down with bolts and a
metal frame. Provide a suitable air baffle.

…In a Snowy Area (for Heat Pump-type Systems)

Install the outdoor unit on a raised platform that is higher
than drifting snow. Provide snow vents.

When Connecting Refrigerant Tubing

• Ventilate the room well, in the event that is refrigerant
gas leaks during the installation. Be careful not to allow
contact of the refrigerant gas with a flame as this will
cause the generation of poisonous gas.

• Keep all tubing runs as short as possible.

• Use the flare method for connecting tubing.

• Apply refrigerant lubricant to the matching surfaces of

the flare and union tubes before connecting them, then
tighten the nut with a torque wrench for a leak-free con­nection.

• Check carefully for leaks before starting the test run.

When Servicing

• Turn the power OFF at the main power box (mains)
before opening the unit to check or repair electrical parts
and wiring.

• Keep your fingers and clothing away from any moving
parts.

• Clean up the site after you finish, remembering to check
that no metal scraps or bits of wiring have been left
inside the unit being serviced.

• Ventilate any enclosed areas when installing or testing
the refrigeration system. Escaped refrigerant gas, on
contact with fire or heat, can produce dangerously toxic
gas.

• Confirm after installation that no refrigerant gas is leak­ing. If the gas comes in contact with a burning stove, gas
water heater, electric room heater or other heat source,
it can cause the generation of poisonous gas.

WARNING

CAUTION

WARNING

CAUTION

ii

2. The standards for minimum room volume are as
follows.

(1) No partition (shaded portion)

(2) When there is an effective opening with the adja-

cent room for ventilation of leaking refrigerant gas
(opening without a door, or an opening 0.15% or
larger than the respective floor spaces at the top
or bottom of the door).

(3) If an indoor unit is installed in each partitioned

room and the refrigerant tubing is interconnected,
the smallest room of course becomes the object.
But when mechanical ventilation is installed inter­locked with a gas leakage detector in the smallest
room where the density limit is exceeded, the vol­ume of the next smallest room becomes the object.

3. The minimum indoor floor space compared with the
amount of refrigerant is roughly as follows: (When
the ceiling is 2.7 m high)

Check of Density Limit

The room in which the air conditioner is to be
installed requires a design that in the event of
refrigerant gas leaking out, its density will not
exceed a set limit.

The refrigerant (R410A), which is used in the air condi­tioner, is safe, without the toxicity or combustibility of
ammonia, and is not restricted by laws imposed to pro­tect the ozone layer. However, since it contains more
than air, it poses the risk of suf focation if its density
should rise excessively . Suffocation from leakage of
refrigerant is almost non-existent. With the recent
increase in the number of high density buildings, how­ever, the installation of multi air conditioner systems is
on the increase because of the need for effective use
of floor space, individual control, energy conservation
by curtailing heat and carrying power, etc.
Most importantly, the multi air conditioner system is
able to replenish a large amount of refrigerant com­pared to conventional individual air conditioners. If a
single unit of the multi air conditioner system is to be
installed in a small room, select a suitable model and
installation procedure so that if the refrigerant acci­dentally leaks out, its density does not reach the limit
(and in the event of an emergency, measures can be
made before injury can occur).
In a room where the density may exceed the limit,
create an opening with adjacent rooms, or install
mechanical ventilation combined with a gas leak
detection device. The density is as given below.

Total amount of refrigerant (kg)

Min. volume of the indoor unit installed room (m3)

≤ Density limit (kg/m

3

)

The density limit of refrigerant which is used in multi air con­ditioners is 0.3 kg/m

3

(ISO 5149).

1. If there are 2 or more refrigerating systems in a sin­gle refrigerating device, the amount of refrigerant
should be as charged in each independent device.

For the amount of charge in this example:

The possible amount of leaked refrigerant gas in rooms
A, B and C is 10 kg.
The possible amount of leaked refrigerant gas in rooms
D, E and F is 15 kg.

NOTE

Outdoor unit

Refrigerant tubing

Refrigerant tubing

Very
small
room

Small
room

Mechanical ventilation device – Gas leak detector

Medium
room

Large room

Indoor unit

Outdoor unit

Indoor unit

Outdoor unit

e.g., charged
amount (10 kg)

e.g., charged
amount (15 kg)

Indoor unit

Room A Room B Room C Room D Room E Room F

40

m

Range below the

2

35

density limit
of 0.3 kg/m

30

(countermeasures
not needed)

25
20
15

10

5

Min. indoor floor space

0

3

10 20 30

Total amount of refrigerant

Range above
the density limit
of 0.3 kg/m
(countermeasures
needed)

3

kg

iii

Contents

1. Line-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

1. Model Selecting and Capacity Calculator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

2. System Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

3. Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25

4. Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

Mini Multiset VRF DCI

1. Outiline of Mini Multiset

2. Design of Mini Multiset

3. Mini Multiset unit specifications

1. Outdoor Unit

1-1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

1-2. Major Component Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

1-3. Dimensional Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

1-4. Refrigerant Flow Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

1-5. Sound Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

4. Test Run and Others

1. Air Purging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2

2. Test Run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

2-1. Preparing for Test Run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

2-2. Test Run Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6

2-3. Outdoor Unit PCB Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7

2-4 Auto Address Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9

2-5. Caution for Pump Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-16

2-6. Meaning of Alarm Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-16

3. Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-18

3-1. General Precautions on Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-18

3-2. Recommended Wire Length and Wire Diameter for Power Supply System . . . . . . . . . . . . . . . . . . . .4-18

3-3. Wiring System Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-19

4. Installation Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-22

4-1. Check of Density Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-22

4-2. Precautions for Installation Using New Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-23

Outline of Mini Multiset

Contents

1. Outiline of Mini Multiset

1. Line-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

1

1 - 1

Outline of Mini Multiset

1. Line-up

Outdoor units

Type

GRFMI306R5I

DC inverter unit

GRFMI406R5I

GRFMI506R5I

Capacity:
kW (BTU/h)

Cooling /
Heating

Outdoor

Unit

340

11.2 (38,200)

/ 12.5 (42,700) / 17.6 (60,000)

170

70

296

1230

66

219

150

Wind direction

13 13

Wind
direction

940

1313

14.0 (47,800) 15.5 (52,900)

/ 16.0 (54,600)

110

10380

20

405

10

15

Wind
direction

81

99
20

1

Wind
direction

18

GRFMI306R5I

60

GRFMI406R5I

71

120

140

167

197

173

573

600

141

GRFMI506R5I

36

60
110
130

72

121

198

168

1 -2

Design of Mini Multiset

2. Design of Mini Multiset

1. Model Selecting and Capacity Calculator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

2. System Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

3. Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25

4. Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

2

2 - 1

2

2 - 2

Design of Mini Multiset

1. Model Selecting and Capacity Calculator

1-1. Operating Range

Cooling

45

43

40

Heating

25

20

35

30

25

14

Operating
range

15

20 25 30

20

15

10

5

Outdoor air intake temp. °C (DB)

0

–5

–10

–15

10

Indoor air intake temp. °C (WB)

15

10

5

0

–5

–10

Outdoor air intake temp. °C (WB)

–15

–20

10

Operating
range

15 20 25 30 35

Indoor air intake temp. °C (DB)

2

2 - 3

Design of Mini Multiset

1. Model Selecting and Capacity Calculator

1-2. Procedure for Selecting Models and Calculating Capacity

■ Model Selection Procedure

Select the model and calculate the capacity for each refrigerant system according to the procedure shown below.

Calculation of the indoor air-conditioning load

● Calculate the maximum air-conditioning load for each room or zone.

Selection of an air conditioning system

● Select the ideal air conditioning system for air conditioning of each room or zone.

Design of the control system

● Design a suitable control system for the selected air conditioning system.

Preliminary selection of indoor and outdoor units

● Make preliminary selections that are within the allowable range for the system. .................. 2-2

Check of the tubing length and elevation difference

● Check that the length of refrigerant tubing and the elevation difference are within the allowable

ranges. ................................................................................................................ 2-4, 2-15 – 2-16

Calculation of the corrected outdoor unit capacity

● Capacity correction coefficient for outdoor temperature conditions ..........................2-4, 2-6 – 2-7

● Capacity correction coefficient for tubing length and elevation difference ........................ 2-4, 2-8

● Heating capacity correction coefficient for frosting/defrosting ............................................2-4, 2-7

Calculation of the corrected capacity for each indoor unit

● Capacity correction coefficient for indoor temperature conditions ......................................2-4, 2-8

● Capacity distribution ratio based on the tubing length and elevation difference....2-4, 2-15 – 2-16

Calculation of the actual capacity for each indoor unit

● Calculate the corrected indoor/outdoor capacity ratio, based on the corrected outdoor unit

capacity and the total corrected capacity of all indoor units in the same system. Use the result to

calculate the capacity correction coefficient for the indoor units. ....................................2-4 – 2-8

● Multiply the corrected capacity of each indoor unit by the capacity correction coefficient to calcu-

late the actual capacity for each indoor unit. ............................................................................ 2-6

Recheck of the actual capacity for each indoor unit

● If the capacity is inadequate, reexamine the unit combinations.

Example 1: Increasing the outdoor unit capacity ........................................................ 2-17 – 2-18

Example 2: Increasing the indoor unit capacity .......................................................... 2-17 – 2-18

Design of tubing

● Create a tubing design which minimizes the amount of additional refrigerant charge as much as

possible. ......................................................................................................................2-14 – 2-15

● If tubing extension is expected in the future, create the tubing design with adequate considera-

tion for this extension.

● Select the tubing size for the main tube (LA) up to the No. 1 distribution joint based on the rated

cooling capacity of the outdoor unit. Select tubing sizes after the distribution point based on the
total rated cooling capacity of the connected indoor units.

Calculation of additional refrigerant charge amount

● Calculate the additional refrigerant charge from the diameters and lengths of the refrigerant tub-

ing. Even if the gas tubing diameter was increased, determine the additional refrigerant charge

based only on the liquid tubing size. ...................................................................................... 2-21

● Check the minimum indoor capacity (limit density) with respect to the amount of refrigerant. If the

limit density is exceeded, be sure to install ventilation equipment or take other corrective steps. 2-22

Design of electrical wiring capacity

● Select a wiring capacity according to the method of power supply. ...................................... 2-32

2

2 - 4

Design of Mini Multiset

1. Model Selecting and Capacity Calculator

1-3. Calculation of Actual Capacity of Indoor Unit

■ Calculating the actual capacity of each indoor unit

Because the capacity of a multi air-conditioner changes according to the temperature conditions, tubing length,
elevation difference and other factors, select the correct model after taking into account the various correction val­ues. When selecting the model, calculate the corrected capacities of the outdoor unit and each indoor unit. Use the
corrected outdoor unit capacity and the total corrected capacity of all the indoor units to calculate the actual final
capacity of each indoor unit.

1. Outdoor unit capacity correction coefficient

Find the outdoor unit capacity correction coefficient for the following items.

(1) Capacity correction for the outdoor unit temperature conditions

From the graph of capacity characteristics on page 2-6, use the outdoor temperature to find the capacity cor­rection coefficient.

(2) Capacity correction for the outdoor unit tubing length and elevation difference

From the graph of capacity change characteristics on page 2-7, use the tubing length and elevation difference
to find the capacity correction coefficient.
The outdoor unit correction coefficient is the value which corresponds to the most demanding indoor unit.

(3) Capacity correction for outdoor unit frosting/defrosting during heating

From the table on page 2-7, find the capacity correction coefficient.

2. Indoor unit capacity correction coefficients

Find the indoor unit capacity correction coefficient for the following items.

(1) Capacity correction for the indoor unit temperature conditions

From the graph of capacity characteristics on page 2-8, use the indoor temperature to find the capacity correc­tion coefficient.

(2) Capacity distribution ratio based on the indoor unit tubing length and elevation difference

First, in the same way as for the outdoor unit, use the tubing length and elevation difference for each indoor unit
to find the correction coefficient from the graph of capacity change characteristics on page 2-8. Then divide the
result by the outdoor unit correction coefficient to find the capacity distribution ratio for each indoor unit.

3. Calculating the corrected capacities for the outdoor unit and each indoor unit

The corrected capacities for the outdoor unit and each indoor unit are calculated form the formula below.

<Cooling>

● Outdoor unit corrected cooling capacity (5) = Outdoor unit rated cooling capacity × Correction coefficient for out-

door temperature conditions ((1) Page 2-6) × Correction coefficient
for tubing length and elevation difference ((2) Page 2-8)

* However, if the outdoor unit corrected cooling capacity [5] is greater than 100%, then the outdoor unit corrected cooling

capacity [5] is considered to be 100%.

● Corrected cooling capacity of each indoor unit (5) = Rated cooling capacity for that indoor unit × Correction coef-

ficient for indoor temperature conditions at that indoor unit ((1) Page 2-7) × Distribution ratio based on tubing
length and elevation difference at that indoor unit ((2) Page 2-8)

However, the corrected cooling capacity of each indoor unit is found as shown below.
If (1) < 100% and (1) × (2) > 100%: Corrected cooling capacity for that indoor unit [5] = Rated cooling capacity for that indoor unit
If (1) ≥ 100%: Corrected cooling capacity for that indoor unit (5) = Rated cooling capacity for that indoor unit × (1)

Capacity distribution ratio for each indoor unit (2) = Correction coefficient for that indoor unit / Correction coefficient for the outdoor unit

2

2 - 5

Design of Mini Multiset

1. Model Selecting and Capacity Calculator

<Heating>

● Outdoor unit corrected heating capacity (5) = Outdoor unit rated heating capacity × Correction coefficient for out-

door temperature conditions ((1) Page 2-6) × Correction coefficient
for tubing length and elevation difference ((2) Page 2-8) × Correc­tion coefficient for frosting/defrosting ((2) Page 2-7)

* However, if the outdoor unit corrected heating capacity [5] is greater than 100%, then the outdoor unit corrected heating

capacity is considered to be 100%.

● Corrected heating capacity of each indoor unit (5) = Rated heating capacity for that indoor unit × Correction coef-

ficient for indoor temperature conditions at that indoor unit ((1) Page 2-6) × Distribution ratio based on tubing
length and elevation difference at that indoor unit ((2) Page 2-8).

length and elevation difference at that indoor unit ((3) Page 2-72)

* Characteristic graphs are shown on the pages listed above next to each correction item.

Find each correction coefficient from the appropriate conditions.

4. Calculating the actual indoor unit capacity based on the indoor/outdoor corrected capacity ratio

Calculate the actual capacity of each indoor unit from the values (found in (3)) for the corrected outdoor unit capac­ity and the corrected capacity of each indoor unit.

<Cooling capacity>

Corrected indoor/outdoor capacity ratio during cooling (Ruc) = Total corrected cooling capacity of all indoor units in
that system / Corrected outdoor unit cooling capacity

If the corrected outdoor unit cooling capacity is greater than or equal to the total corrected unit cooling capacity of
all indoor units in that system (Ruc ≤ 1), then:

Actual cooling capacity of each indoor unit (7) = Corrected cooling capacity of each indoor unit (5)
(In other words, the correction coefficient (6), based on the corrected indoor/outdoor capacity ratios for each
indoor unit, is 1.)

If the corrected outdoor unit cooling capacity is less than the total corrected unit cooling capacity of all indoor units
in that system (Ruc > 1), then:

(Actual cooling capacity of each indoor unit (7)) = (Corrected cooling capacity of each indoor unit (5)) × (0.25

×

Ruc + 0.75) / Ruc
(In other words, the correction coefficient (6), based on the corrected indoor/outdoor capacity ratios for each
indoor unit, is the underlined part in the formula above.)

<Heating capacity>

Corrected indoor/outdoor capacity ratio during heating (Ruh) = Total corrected heating capacity of all indoor units in
that system / Corrected outdoor unit heating capacity

If the corrected outdoor unit heating capacity is greater than or equal to the total corrected unit heating capacity of
all indoor units in that system (Ruh ≤ 1), then:

Actual heating capacity of each indoor unit (7) = Corrected heating capacity of each indoor unit (5)
(In other words, the correction coefficient (6), based on the corrected indoor/outdoor capacity ratios for each
indoor unit, is 1.)

If the corrected outdoor unit heating capacity is less than the total corrected unit heating capacity of all indoor units
in that system (Ruh > 1), then:

(Actual heating capacity of each indoor unit (7)) = (Corrected heating capacity of each indoor unit (5)) × (0.1

×

Ruh + 0.9) / Ruh
(In other words, the correction coefficient (6), based on the corrected indoor/outdoor capacity ratios for each
indoor unit, is the underlined part in the formula above.)

However, the corrected heating capacity of each indoor unit is found as shown below.
If (1) < 100% and (1) × (2) > 100%: Corrected heating capacity for that indoor unit (5) = Rated heating capacity for that indoor unit
If (1) ≥ 100%: Corrected heating capacity for that indoor unit (5) = Rated heating capacity for that indoor unit × (1)

Design of Mini Multiset

1. Model Selecting and Capacity Calculator

Refer to the graph below for the correction coefficients for Ruc and Ruh.

Indoor unit capacity correction coefficient for Ruc (cooling)
Indoor unit capacity correction coefficient for Ruh (heating)

1.0

0.9

0.8

0.7

2

0.6

0.5

Indoor unit capacity correction coefficient

0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9
Corrected indoor/outdoor capacity ratio (Ruc or Ruh)

Note:

When Ruc or Ruh is less than or equal to 1.0, the indoor unit capacity correction coefficient for both Ruc and Ruh is 1.0.

5. Graph of capacity correction coefficients

■ Graph of outdoor unit capacity characteristics (1 – (1))

Outdoor unit cooling capacity characteristics

120

100

80

Capacity ratio (%)

22WB

19WB

16WB

104
100
90

80

(1) GRFMI306R5I

(1)
(2)

(1)

(2)

GRFMI406R5I

(2) GRFMI506R5I

2.0

–10

35 38

Outdoor air intake temp. (°C DB)

43

2 - 6

Design of Mini Multiset

1. Model Selecting and Capacity Calculator

Outdoor unit heating capacity characteristics

GRFMI306R5I

130
120
110
100

90
80
70
60

Capacity ratio (%)Capacity ratio (%)

50

0

4

0
–20 –15 –10 –5 0 5 10 15

Outdoor air intake temp. ( C DB)

GRFMI506R5I

130
120
110
100

90
80
70
60
50
40

0
–20 –15 –10 –5 0 5 10 15

Outdoor air intake temp. ( C DB)

( C DB)

15

20

25

( C DB)

15

20

25

GRFMI406R5I

130
120
110
100

90
80
70
60

Capacity ratio (%)

50

0

40

–20 –15 –10 –5 0 5 10 15

Outdoor air intake temp. ( C DB)

( C DB)

15

20

25

2

■ Outdoor unit heating capacity correction coefficient during frosting/defrosting (1 – (2))

Outdoor intake air
temp.

(°C WB RH 85%)

Correction

coefficient

–20 –15 –10 –8 –6 –5 –4 –2 –10123456

0.97 0.97 0.97 0.96 0.94 0.91 0.89 0.87 0.87 0.87 0.88 0.89 0.91 0.92 0.95 1.0

* To calculate the heating capacity with consideration for frosting/defrosting operation, multiply the heating capacity

found from the capacity graph by the correction coefficient from the table above.

2 - 7

2

2 - 8

Design of Mini Multiset

1. Model Selecting and Capacity Calculator

■ Graph of indoor unit capacity characteristics (2 – (1))

■ Graph of capacity change characteristics resulting from tubing length and elevation difference (1 • 2 – (2))

The positive side for the elevation difference indicates that the outdoor unit is installed at a higher position than the
indoor units. The negative side indicates the opposite.

Indoor unit cooling capacity characteristics Indoor unit heating capacity characteristics

120

110

100

90

80

14 15 16 17 18 19 20 21 22 23 24 25 15 16 17 18 19 20 21 22 23 24 25 26

Indoor air intake temp. (°C WB)

Rate of cooling capacity change (%)

Base capacity
change rate (%)

50

40

30

20

100

10

0

-10

-20

-30

Elevation difference (m)

-40
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150

94

96

98

%

indicates the rating point. indicates the rating point.

110

105

100

95

90

Indoor air intake temp. (°C DB)

Rate of heating capacity change (%)

<Cooling>

<Heating>

Base capacity

92 90 88 86 84 82 80 78 76

Equivalent length (m)

change rate (%)

50

40

30

99

20

100

10

%

0

-10

-20

-30

Elevation difference (m)

-40
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150

97 96 95 94 93 92 91

98

Equivalent length (m)

27

Design of Mini Multiset

1. Model Selecting and Capacity Calculator

1-4. Capacity Correction Graph According to Temperature Condition

■ Capacity characteristics

(The corrected capacity for specific temperature conditions can be found from the graphs below and next page.)

<COOLING>

120

100

80

Capacity ratio (%)

100

50

Capacity ratio (%)

–10

63

50

33

22WB

19WB

16WB

Outdoor air intake temp. (°C DB)

112

92

100104

22WB

19WB

16WB

35 38

43

104
100

90
80

124
118
114
108
100

(1) GRFMI306R5I

(1)
(2)

(1)

(2)

(1)
(1)
(2)
(2)
(2)

GRFMI406R5I

(2) GRFMI506R5I

(1) GRFMI306R5I

GRFMI406R5I

(2) GRFMI506R5I

2

–10

35 38 43

Outdoor air intake temp. (°C DB)

2 - 9

Design of Mini Multiset

1. Model Selecting and Capacity Calculator

<HEATING>

2

GRFMI306R5I

130
120
110
100

90
80
70
60

Capacity ratio (%)

50
40

130
120
110
100

90
80
70

Input ratio (%)Capacity ratio (%)Input ratio (%)

60
50

–20 –15 –10 –5 0 5 10 15

Outdoor air intake temp. ( C DB)

GRFMI506R5I

130
120
110
100

90
80
70
60
50
40

( C DB)

15

20

25

15

20

25

( C DB)

15

20

25

GRFMI406R5I

130
120
110
100

90
80
70
60

Capacity ratio (%)Input ratio (%)

50
40

130
120
110
100

90
80
70
60
50

–20 –15 –10 –5 0 5 10 15

Outdoor air intake temp. ( C DB)

( C DB)

15

20

25

15

20

25

130
120
110
100

90
80
70
60
50

–20 –15 –10 –5 0 5 10 15

Outdoor air intake tem

p. ( C DB)

15

20

25

NOTE

For model combinations (inverter model + constant-speed model) of 22 HP or higher, the lower limit for the out­door air intake temperature is 5°C.

However, when the inverter model (GRFMI306-406-506R5I) is used separately, the lower limit for the outdoor air

intake temperature is –5°C.

2 - 10

Design of Mini Multiset

1. Model Selecting and Capacity Calculator

● Inverter model rated performance values

Cooling HeatingItem

Cooling

capacity

Model (SPW-)

GRFMI306R5I
GRFMI406R5I
GRFMI506R5I

(kW)

11.2

14.0

15.5

■ Outdoor unit heating capacity correction coefficient during frosting/defrosting (1 – (3))

Power

consumption

(kW)

2.76

3.83

4.57

Heating

capacity

(kW)

12.5

16.0

17.6

Power

consumption

(kW)

2.88

3.90

4.58

Outdoor intake air
temp.

(°C WB RH 85%)

Correction

coefficient

–20 –15 –10 –8 –6 –5 –4 –2 –10123456

0.97 0.97 0.97 0.96 0.94 0.91 0.89 0.87 0.87 0.87 0.88 0.89 0.91 0.92 0.95 1.0

* To calculate the heating capacity with consideration for frosting/defrosting operation, multiply the heating capacity

found from the capacity graph by the correction coefficient from the table above.

1-5. Capacity Correction Graph According to Tubing Length and Elevation Difference

■ Capacity change characteristics

<Cooling>

Base capacity
change rate (%)

50

40

30

20

100

10

0

–10

Elevation difference (m)

–20

–30

–40

0 10 20 30 40 50 60 70 80 90 100 110

96

98

%

92 90 88 86 84 82 80 78 76

94

*1

Equivalent length (m)

120 130

140 150

2

<Heating>

Base capacity
change rate (%)

50

40

30

20

10

0

–10

–20

Elevation difference (m)

–30

–40

99

100

%

0 10 20 30 40 50 60 70 80 90 100 110

97 96 95 94 93 92 91

98

*1

Equivalent length (m)

120 130

140 150

2 - 11

Design of Mini Multiset

1. Model Selecting and Capacity Calculator

For GRFMI306-406R5I units

■ If the maximum tubing length (L1) exceeds 90 m (equivalent length), increase the tubing size of the main gas
tube (LM) by one rank.

* The size increase is applied to the gas tube only. In addition, for a 6 HP unit it is not necessary to increase the

tubing size.

■ Increasing the tubing size of the gas tubes can reduce the loss of capacity caused by longer tubing lengths.
Refer to Table 1 to increase the tubing size. However, the maximum allowable tubing length must not be exceeded.

* The size increase is applied to the LM gas tube (main tube with the largest diameter) only, and is limited to the

cases shown in Table 1. In addition, the amount of additional refrigerant charge is determined from the liquid­tube size only.

* In case of 6PS, increasing the size of the gas tube is not possible.

2

Table 1 Correction coefficient for equivalent length when the size of the gas tube (LM) is increased

Standard tube diameter (gas tube, mm)

Tube diameter after change (gas tube, mm)

Equivalent length correction coefficient

* When increasing the size of the gas tubing (LM), multiply by the correction coefficient from Table 1 and calculate the

equivalent length for section LM.

Tubing equivalent length after size increase = Standard tubing equivalent length × Equivalent length correction coefficient

WARNING

The upper limit for tubing size is ø19.05. Tubing above that size cannot be used.

ø15.88

ø19.05

0.4

2 - 12

2

2 - 13

Design of Mini Multiset

2. System Design

2-1. Tools Required for Installation (not supplied)

1. Standard screwdriver

2. Phillips head screwdriver

3. Knife or wire stripper

4. Tape measure

5. Carpenter’s level

6. Sabre saw or key hole saw

7. Hacksaw

8. Core bits

9. Hammer

10. Drill

11. Tube cutter

12. Tube flaring tool

13. Torque wrench

14. Adjustable wrench

15. Reamer (for deburring)

2-2. Accessories Supplied with Outdoor Unit

2-4. Additional Materials Required for Installation

1. Refrigeration (armored) tape

2. Insulated staples or clamps for connecting wire
(See your local codes.)

3. Putty

4. Refrigeration tubing lubricant

5. Clamps or saddles to secure refrigerant tubing

6. Scale for weighing

2-3. Type of Copper Tube and Insulation Material

If you wish to purchase these materials separately
from a local source, you will need:

1. Deoxidized annealed copper tube for refrigerant
tubing.

2. Foamed polyethylene insulation for copper tubes as
required to precise length of tubing. Wall thickness
of the insulation should be not less than 8 mm.

3. Use insulated copper wire for field wiring. Wire
size varies with the total length of wiring. Refer to

5. ELECTRICAL WIRING for details.

Check local electrical codes
and regulations before
obtaining wire. Also, check
any specified instructions
or limitations.

Table 2-1 (Outdoor Unit)

Part name

Figure

365 Model

(4 hp)

CAUTION

Quantity

485 Model

(5 hp)

605 Model

(6 hp)

Tube Discharge
Assy

Instruction manual

paper

0

1

0

1

hp = horsepower

1

1

2

2 - 14

Design of Mini Multiset

2. System Design

Material O

Copper tubing

Outer diameter 6.35 9.52 12.7 15.88

Wall thickness 0.8 0.8 0.8 1.0 1.0

19.05

Table 2-6 Required Copper Tubing Dimensions Unit: mm

Gas tubing size (mm)

90° elbow

45° elbow

U-shape tube bend (R60 100 mm)

Trap bend

12.7

0.30

0.23

0.90

2.30

15.88

0.35

0.26

1.05

2.80

19.05

0.42

0.32

1.26

3.20

Y-branch distribution joint Equivalent length conversion not needed.

Ball valve for service Equivalent length conversion not needed.

2-6. Straight Equivalent Length of Joints

Design the tubing system by referring to the following table for the straight equivalent length of joints.

Table 2-5 Straight Equivalent Length of Joints

Table 2-4 Indoor Unit Tubing Connection (1, 2...

n–1

)

2-5. Tubing Size

Table 2-2 Main Tubing Size (LA)

Table 2-3 Main Tubing Size After Distribution (LB, LC...)

Note: In case the total capacity of connected indoor units exceeds the total capacity of the outdoor units, select the main

tubing size for the total capacity of the outdoor units.

kW

System
horsepower

Gas tubing
(mm)

Liquid tubing
(mm)

Total capacity
after distribution

Tubing size

11.2

4

Below kW

Over kW

Gas tubing

Liquid tubing

Indoor unit type

Gas tubing

Liquid tubing

(mm)

(mm)

ø15.88

22 28

14.0

5

ø9.52

(mm)

(mm)

15.5

6

ø19.05

Unit: mm

7.1

(2.5 hp)

–

ø12.7

ø9.52

36

ø12.7
ø6.35

11. 2

(4 hp)

ø15.88

14.0

(5 hp)

7.1

(

2.5

ø9.52

hp)

15.5

(6 hp)

ø19.05

Unit: mm
hp = horsepower

45 56 73 106

ø15.88

ø9.52

140

--

Unit: mm

Design of Mini Multiset

2. System Design

2-7. Additional Refrigerant Charge

Additional refrigerant charge amount is calculated from the liquid tubing total length as follows.

Table 2-7 Amount of Refrigerant Charge Per Meter, According to Liquid Tubing Size

Liquid tubing size Amount of refrigerant

charge/m (g/m)

ø6.35 26

ø9.52 56

Required amount of charge = (Amount of refrigerant
charge per meter of each size of liquid tube × its tube
length) + (...) + (...)

*Always charge accurately using a scale for weighing.

Table 2-8 Refrigerant Charge Amount at Shipment (for outdoor unit)

Heat pump unit GRFMI306R5I

(kg)

Cooling only unit

(kg)

GRFMI306R5I

3.5

3.5

GRFMI406R5

3.5

GRFMI406R5

3.5

GRFMI506R5

3.5

GRFMI506R5

3.5

2-8. System Limitations

Table 2-9 System Limitations

Outdoor units (Type)
Number of max. connectable indoor units

Max. allowable indoor/outdoor capacity ratio

306

6

50 130%

406

8

506

9

2-9. Tubing Length

Select the installation location so that the length and size of refrigerant tubing are within the allowable range shown
in the figure below.

2

LA

Main tube of unit

1st branch

1

L3

Unit distribution tube

Note: Do not use commercially available T-joints for the liquid tubing.
* Be sure to use special R410A distribution joints (purchased separately) for outdoor

unit connections and tubing branches.

L1
L2

LCLB

2 3

LD

n

n-1

2 - 15

H1

H2

R410A distribution joint
K70A056Z (for indoor unit)

2

2 - 16

Design of Mini Multiset

2. System Design

Minimum indoor volume & floor area as against the
amount of refrigerant is roughly as given in the follow­ing table.

Pay special attention to
any location, such as a
basement, etc., where leak­ing refrigerant can accu­mulate, since refrigerant
gas is heavier than air.

Table 2-10 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights

Always check the gas den­sity limit for the room in
which the unit is installed.

2-10. Check of Limit Density

When installing an air conditioner in a room, it is nec­essary to ensure that even if the refrigerant gas acci­dentally leaks out, its density does not exceed the
limit level for that room.

If the density could exceed the limit level, it is neces­sary to provide an opening between the unit and the
adjacent room, or to install mechanical ventilation
which is interlocked with the leak detector.

(Total refrigerant charged amount: kg)

(Min. indoor volume where the indoor unit is installed: m3)

≤ Limit density 0.3 (kg/m3)

The limit density of refrigerant which is used in this
unit is 0.3 kg/m3(ISO 5149).

The shipped outdoor unit comes charged with the
amount of refrigerant fixed for each type, so add it to
the amount that is charged in the field. (For the refrig­erant charge amount at shipment, refer to the unit’s
nameplate.)

Allowable tubing
length

Allowable elevation
difference

Items Marks Contents Length (m)

L1 Max. tubing length

Actual length 150

Equivalent length 175

L (L2 – L3)

1, 2~ n

+2+~

1

n–1

Difference between max. length and min.
length from the No.1 distribution joint

Max. length of each distribution tube 30

Total max. tubing length including length of

+L1

each distribution tube (only liquid tubing)

When outdoor unit is installed higher than indoor unit 50

H1

When outdoor unit is installed lower than indoor unit 40

H2 Max. difference between indoor units 15

>

>

>

>

>

>

>

>

40

200

L = Length, H = Height

WARNING

2

m
100

95
90
85
80
75
70
65
60
55
50
45
40

Min. indoor floor area

(when the ceiling is 2.7 m high)

35
30
25
20
15

3

m

270.0

256.5

243.0

229.5

216.0

202.5

189.0

175.5

162.0

148.5

135.0

Min. indoor volume

121.5

108.0

94.5

81.0

67.5

54.0

40.5

Range below the
density limit of

0.3 kg/m
(Countermeasures
not needed)

20 30 40 50 60 70 80 kg

Total amount of refrigerant

3

Range above the
density limit of

0.3 kg/m
(Countermeasures
needed)

3

CAUTION

Design of Mini Multiset

2. System Design

2-11. System Example

(1) Below are the tables created using the “Sanyo PAC/GHP System Diagram Software.”

Details of the calculations are shown in (2).

Outdoor

unit

50 m

Elevation
difference: 10 m

Indoor

unit 1

10 m

10 m

20 m 20 m

10 m

Indoor

unit 2

Indoor

unit 3

10 m

Indoor

unit 4

Selection conditions

Assumes that installation is in a 50 Hz region.

Outdoor unit

Room 1

(indoor unit 1)

Room 2

(indoor unit 2)

Room 3

(indoor unit 3)

Room 4

(indoor unit 4)

Selected model GRFMI306R5 Type 18 Type 7 Type 7 Type 7

Air condition

Cooling

(DB/WB)
Max. load (kW)

Air condition

Heating

(DB/WB)
Max. load (kW)

Actual tubing length

Equivalent length (with
consideration for curves,

etc.)

33.0 / 22.5

26.0 / 18.0

26.0 / 18.0 26.0 / 18.0 26.0 / 18.0

5.4 1.8 2.1 2.1

3.0 / 2.0 21.0 / 13.0 21.0 / 13.0 21.0 / 13.0 21.0 / 13.0

2.32.32.35.6

100 m

100 m90 m70 m60 m

120 m 72 m 84 m 108 m 120 m

Preliminary selection

Selected model
Load (cooling/heating) (kW)

Rated capacity
(cooling/heating) (kW)

(5) Corrected capacity

(cooling/heating) (kW)

(7) Actual capacity

(cooling/heating) (kW)

Outdoor unit

GRFMI406R5 Type 18 Type 7 Type 7 Type 7

Room 1

(indoor unit 1)

5.4 / 5.6 1.8 / 2.3 2.1 / 2.3 2.1 / 2.3

14.0 / 16.0

11.17 / 13.20

5.6 / 6.3

5.60 / 5.96

5.32 / 5.96 2.09 / 2.35 2.00 / 2.31

Room 2

(indoor unit 2)

2.2 / 2.5

2.20 / 2.35

Room 3

(indoor unit 3

2.2 / 2.5

2.11 / 2.31

Room 4

)

(indoor unit 4)

2.2 / 2.5

2.05 / 2.29

1.95 / 2.29

Total corrected capacity of indoor units (cooling/heating) = 11.96 / 12.91
Ruc = 11.96 / 11.17 = 1.071 > 1 Ruh = 12.91 / 13.20 = 0.978 < 1

Outdoor unit changes

During heating, the corrected outdoor unit capacity is less than the total corrected capacity of all indoor units
in the system. As a result, the actual capacity of each indoor unit is less than the maximum load. Therefore
the outdoor unit is increased by one rank.

Selected model
Maximum load

(cooling/heating) (kW)
Rated capacity

(cooling/heating) (kW)
(5) Corrected capacity

(cooling/heating) (kW)

(7) Actual capacity

(cooling/heating) (kW)

Outdoor unit

GRFMI506R5

16.0 / 18.0

12.77 / 14.85

Room 1

(indoor unit 1)

Type 18 Type 7 Type 7 Type 7

5.4 / 5.6 1.8 / 2.3 2.1 / 2.3 2.1 / 2.3

5.6 / 6.3

5.60 / 5.96

5.60 / 5.96

Room 2

(indoor unit 2)

2.2 / 2.5

2.20 / 2.35

2.20 / 2.35

Room 3

(indoor unit 3)

2.2 / 2.5

2.11 / 2.31

2.11 / 2.31

Room 4

(indoor unit 4)

2.2 / 2.5

2.05 / 2.29

2.05 / 2.29

Total corrected capacity of all indoor units (cooling/heating) = 11.96 / 12.91
Ruc = 11.96 / 12.77 = 0.937 < 1 Ruh = 12.91 / 14.85 = 0.869 < 1

2

2 - 17

2

Design of Mini Multiset

2. System Design

Indoor unit changes

The indoor unit in room 4, where the corrected indoor unit capacity is less than the maximum load, is
increased by one rank.

Outdoor unit

Selected model
Maximum load

(cooling/heating) (kW)
Rated capacity

(cooling/heating) (kW)
(5) Corrected capacity

(cooling/heating) (kW)

(7) Actual capacity

(cooling/heating) (kW)

Total corrected capacity of all indoor units (cooling/heating) = 12.53 / 13.55
Ruc = 12.53 / 12.77 = 0.981 < 1 Ruh = 13.55 / 14.85 = 0.913 < 1

•For both cooling and heating in all rooms, actual capacity is now greater than or equal to the maximum
load. Selection is completed.

GRFMI506R5I

12.77 / 14.85

Room 1

(indoor unit 1)

Type 18 Type 7 Type 9Type 7

5.4 / 5.6 1.8 / 2.3 2.1 / 2.3 2.1 / 2.3

5.6 / 6.316.0 / 18.0

5.60 / 5.96

5.60 / 5.96

Room 2

(indoor unit 2)

2.2 / 2.5 2.2 / 2.5

2.20 / 2.35 2.11 / 2.31 2.62 / 2.93

2.20 / 2.35 2.11 / 2.31 2.62 / 2.93

Room 3

(indoor unit 3)

Room 4

(indoor unit 4)

2.8 / 3.2

(2) Calculate the final selection results according to the capacity calculation procedure.

[From calculation of the correction coefficient to calculation of actual capacity] (Cooling/heating)

Outdoor unit

Rated capacity
(cooling/heating) (kW)

(1) Model

(2) Temp. condition

(3) Tubing length,

elevation difference

Distribution ratio

(4) Frosting • defrosting

Correction coefficient
Result of (2) × (3)
Correction coefficient

applied to indoor unit *1

(5)

Corrected capacity (kW)
(6) Correction coefficient

for corrected capacity
ratio

(7) Actual capacity (kW)

*1: This varies depending on the values of (2) and (2) × (Distribution ratio in (3)).
*2: Corrected outdoor unit capacity = Rated outdoor unit capacity × (1) × (2) × (3) × (4)

*2

16.0 / 18.0

1.00 / 1.00

1.00 / 1.00 0.934 / 0.917

0.798 / 0.927 0.798 / 0.9270.882 / 0.956

— / 0.89

12.77 / 14.85

Room 1

(indoor unit 1)

5.6 / 6.3

0.944 / 1.198

1.032 / 0.964 1.008 / 0.940 0.959 / 0.924 0.934 / 0.917

1.000 / 0.946 1.000 / 0.940

5.60 / 5.96

1.00 / 1.00

5.60 / 5.96

Room 2

(indoor unit 2)

2.2 / 2.5

0.934 / 0.917 0.934 / 0.917 0.934 / 0.917

0.922 / 1.190 0.877 / 1.170 1.000 / 1.000

2.20 / 2.35

2.20 / 2.35 2.11 / 2.31 2.62 / 2.93

Room 3

(indoor unit 3)

2.2 / 2.5

0.819 / 0.9340.861 / 0.950

0.959 / 0.924 0.934 / 0.917

2.11 / 2.31 2.62 / 2.93

Room 4

(indoor unit 4)

2.8 / 3.2

The actual capacity is calculated as shown below.

Cooling: Ruc = (5.60 + 2.20 + 2.11 + 2.62) / 12.77 = 0.981 < 1
Therefore,
Actual cooling capacity of each indoor unit = Corrected cooling capacity of each indoor unit
(In other words, the correction coefficient [6] for the corrected capacity ratio is 1.)

Heating: Ruh = (5.96 + 2.35 + 2.31 + 2.93) / 14.85 = 0.913 < 1
Therefore,
Actual heating capacity of each indoor unit = Corrected heating capacity of each indoor unit
(In other words, the correction coefficient (6) for the corrected capacity ratio is 1.)

2 - 18

2

2 - 19

Design of Mini Multiset

2. System Design

2-12. Example of Tubing Size Selection and Refrigerant Charge Amount

Additional refrigerant charging

Based on the values in Tables 2-2, 2-3, 2-4 and 2-7, use the liquid tubing size and length, and calculate the
amount of additional refrigerant charge using the formula below.

= [56 × (a) + 26 × (b)] × 10

–3

(a): Liquid tubing Total length of ø9.52 (m) (b): Liquid tubing Total length of ø6.35 (m)

● Charging procedure

Be sure to charge with R410A refrigerant in liquid form.

1. After performing a vacuum, charge with refrigerant from the liquid tubing side. At this time, all valves must be
in the “fully closed” position.

2. If it was not possible to charge the designated amount, operate the system in Cooling mode while charging
with refrigerant from the gas tubing side. (This is performed at the time of the test run. For this, all valves
must be in the “fully open” position.)
Charge with R410A refrigerant in liquid form.
With R410A refrigerant, charge while adjusting the amount being fed a little at a time in order to prevent
liquid refrigerant from backing up.

● After charging is completed, turn all valves to the “fully open” position.

● Replace the tubing covers as they were before.

Required additional
refrigerant charge (kg)

1. R410A additional charging absolutely must be done through liquid charging.

2. The R410A refrigerant cylinder has a gray base color, and the top part is pink.

3. The R410A refrigerant cylinder includes a siphon tube. Check that the siphon
tube is present. (This is indicated on the label at the top of the cylinder.)

4. Due to differences in the refrigerant, pressure, and refrigerant oil involved in
installation, it is not possible in some cases to use the same tools for R22 and
for R410A.

1

Tightening torque for valve stem cap: 19~21 N·m

Tightening torque: 34~42 N·m

CAUTION

4

3

2

Tightening torque: 68~82 N·m

Tightening torque for valve stem cap: 28~32 N·m

Design of Mini Multiset

2. System Design

Example:

2

LA

Main tube of unit

L1
L2

LCLB

LN

n

1st branch

Unit distribution tube

1

2 3

n–1

model 7 model 9 model 12 model 16

● Example of each tubing length

Main tubing Distribution joint tubing

LA = 40 m Indoor side
LB = 5 m
LC = 5 m
LD = 15 m

● Obtain charge amount for each tubing size

= 5 m

1

= 5 m

2

= 2 m

3

= 6 m

4

= 5 m

5

Note that the charge amounts per 1 meter are different for each liquid tubing size.

ø9.52 → LA + LB + LC + LD : 65 m × 0.056 kg/m = 3.64 kg
ø6.35 →

1 + 2 + 3 + 4 + 5 : 23 m × 0.026 kg/m = 0.598 kg

Total 4.238 kg

Additional refrigerant charge amount is 4.238 kg.

model 18

Be sure to check the limit densi-

CAUTION

ty for the room in which the
indoor unit is installed.

Checking of limit density

Density limit is determined on the basis of the size of a
room using an indoor unit of minimum capacity. For
instance, when an indoor unit is used in a room (floor
area 7.43 m

20.06 m
room volume should be 14.1 m

2

× ceiling height 2.7 m = room volume

3

), the graph at right shows that the minimum

3

(floor area 5.2 m2) for
refrigerant of 4.238 kg. Accordingly, openings such as
louvers are required for this room.

<Determination by calculation>

Overall refrigerant charge amount for the air conditioner: kg

(Minimum room volume for indoor unit: m3)

4.238 (kg) + 3.5 (kg)

=

20.06 (m

3

= 0.39 (kg/m

)

3

) ≥ 0.3 (kg/m3)

Therefore, openings such as louvers are required for
this room.

3

m

108.0

94.5

81.0

67.5

54.0

40.5

27.0

13.5

40

35

2

m

30

25

20

15

10

(when the ceiling is 2.7 m high)

5

Min. indoor floor area

0

0

Range below the
density limit
of 0.3 kg/m
(countermeasures
not needed)

3

10 20 30

Total amount of refrigerant

Range above
the density limit
of 0.3 kg/m
(countermeasures
needed)

3

kg

2 - 20

2

2 - 21

Design of Mini Multiset

2. System Design

2-13. Installing Distribution Joint

(1) Refer to “HOW TO ATTACH DISTRIBUTION

JOINT” enclosed with the optional distribution

joint kit (K70A056Z).

(2) In order to prevent accumulation of refrigerant oil in

stopped units, if the main tubing is horizontal then
each branch tubing length should be at an angle
that is greater than horizontal. If the main tubing is
vertical, provide a raised starting portion for each
branch.

(3) If there are height differences between indoor units

or if branch tubing that follows a distribution joint is
connected to only 1 unit, a trap or ball valve must
be added to that distribution joint. (When adding
the ball valve, locate it within 40 cm of the distribu­tion joint.)

(Consult with ARGO separately concerning the

ball valve.)

If a trap or ball valve is not added, do not operate
the system before repairs to a malfunctioning
unit are completed. (The refrigerant oil sent
through the tubing to the malfunctioning unit will
accumulate and may damage the compressor.)

Tube branching methods (horizontal use)

15 to 30°

B

Horizontal

A

line

View as seen
from arrow

Arrow view

(If only 1 unit is connected, a ball
valve is also needed on this side.)

Horizontal

Indoor unit

(Each unit is
connected to tubing
that is either level or
is directed
downward.)

Types of vertical trap specifications

Main tubing

Ball valve

(BV: purchased

separately)

Indoor unit (1)

Main tubing

B

(When using ball valve)

Indoor unit (more than 2 units)

(When not using ball valve)

Branch tubing is
directed upward.

More than
20 cm

A

Indoor unit is directed downward

Design of Mini Multiset

2. System Design

2-14. Optional Distribution Joint Kit

See the installation instructions packaged with the distribution joint kit for the installation procedure.

Table 2-11

Model name Cooling capacity after distribution Remarks

K70A056Z 22.4 kW or less For indoor unit

K70A056Z

Use: For indoor unit (Capacity after distribution joint is 22.4 kW or less.)

2

Example: (F below indicates inner diameter. below indicates outer diameter.)

• When creating a tube of diameter G,
use a tube cutter and cut between F
and H. Cut at a point as close to H
as possible.

F

HG

Insulator

F

145

Table 2-12 Dimension for Connections of Each Part

Gas tube Liquid tube

210 55

F

F

185

F

F

GH

F

G
H

103

H

I

J

Insulator

135

50

H

J

I

83

H

I
J

Unit: mm

Position A B C D E F G H I J

Dimension –– – – –ø19.05 ø15.88 ø12.7 ø9.52 ø6.35

2-15. Optional Ball Valve Kit (N.A.)

Table 2-13

Valve connecting tube size (mm) Indoor unit where used

Model No.

Gas tube Liquid tube

BV-RXP160AG 15.88
BV-RXP56AG 12.7

9.52

6.35

Total capacity of indoor units
after the valve

16.0 kW or less

5.6 kW or less

NOTE

1. Because the diameter of this ball valve is approximately the same as the inner diameter of the connecting cop­per tube, correction for pressure loss is not necessary.

2. Airtightness must be 3.6 MPa or more.
It is recommended that the ball valve is installed at each outdoor unit (gas tube and liquid tube), in order to
prevent refrigerant from being released into the atmosphere if the outdoor unit is eventually replaced.

2 - 22

2

2 - 23

Design of Mini Multiset

2. System Design

Ball Valve Installation (for refrigerant R410A only)

Check the size of the ball valve set you separately purchased.

1. Installing the ball valve

(1) If the ball valve is to be installed for indoor unit

extension, or near an indoor unit, install it so that
the service port faces the indoor unit side.
(This facilitates indoor unit leak testing and vacu­um procedures.)
Install the ball valve as close as possible to the
distribution joint.

This ball valve is for use
only in systems that utilize
refrigerant R410A. The ser­vice port connection size is
ø7.94. The face-to-face dis­tance between the ø12.7 or
ø15.88 flare nuts is 26 mm
or 29 mm, respectively.
Be sure to use only the
supplied flare nuts. Be
careful to use the correct
tools and materials.

2. Flare nut tightening

The flare nut on the service port side is fully tight­ened. Recommended tightening torque is
(8~10 N·m).

If the valve is used for extension, it can be used
as-is. In all other cases, use 2 monkey wrenches
in combination to loosen the flare nut.

Model name Size

BV-RXP56AG ø6.35 • ø12.7

BV-RXP160AG ø9.52 • ø15.88

Dimensions

Unit: mm

Note: Install the service port so that it faces the extension side.

Figure

Type with flare nut at each end

A

E

Insulator

(divided in 2)

Service port

30˚

Size

ø6.35 (1/4")

D

C

ø9.52 (3/8")
ø12.7 (1/2")
ø15.88 (5/8")

Dimensions

BCD

A

72

42

76

42

89

42
51

108

54
54
58
68

16
16
20
22

E

44
44
51
56

Outdoor unit

CAUTION

Ball valve

Service
port

Indoor unit

Indoor unit extension

Valve cap
Tightening torque (19~21 N

Fully tightened (this side only)

Indoor

Outdoor

•m)

Service port
Tightening torque (8~10 N

Plug
(this side only)

•m)

2

2 - 24

Design of Mini Multiset

2. System Design

2-14. Recommended Location of Ball Valves

● Select a valve location that allows service to be easily provided for each unit or each refrigerant system.

(1) When adding ball valve for indoor unit

1. Location: Install the ball valve at the distribution tube (not main tube).

2. Installation requirements

• Be sure to install the ball valve up-grade to prevent the inadvertent flow of oil.

• Install the ball valve at the shortest distance (within 40 cm) from the main tube. If the diameter of the ball valve
is smaller than that of the main tube, use a reducer or the like to reduce the size of the tubing at that location.

• Select a place where it is easy to operate, using careful consideration of the location in advance.

3. Opening and closing the valve

This valve is open at the time of shipment from the
factory. If the valve is used for extension, be sure
to close it.

4. Installing thermal insulation

The thermal insulation used for a flare-nut type
valve is in the form of a bag. When the valve is
used for extension, it can be used as-is. If the
valve is used for any other purpose, use a box
cutter or similar tool to cut away the part shown in
the figure at right.
The insulation is divided into 2 parts. After per­forming the leak test, use vinyl tape or other
means to temporarily fasten the 2 parts together.
Then carry out final finishing.

Valve opened

Spindle

Valve closed

Insulator

Spindle

Notch

Outdoor unit

Main tube

Less than 40 cm

Distribution joint

Distribution tube

Ball valve (for extension)

Indoor unit for extension

Distribution tube

Main tube

Ball valve (for extension)

Indoor unit for extension

2

3. Installation Instructions

3-2. Outdoor Unit

AVOID:

● heat sources, exhaust fans, etc. (Fig. 2-6)

● damp, humid or uneven locations

DO:

● choose a place as cool as possible.

● choose a place that is well ventilated and outside air temperature

does not exceed maximum 45°C constantly.

● allow enough room around the unit for air intake/

exhaust and possible maintenance. (Fig. 2-7)

● use lug bolts or equal to bolt down unit, reducing vibration and noise.

Design of Mini Multiset

Exhaust fan

Hot air

Heat source

Out­door
unit

Fig. 2-6

Installation space

Distance between obstructions and the unit air inlet and outlet must be
as shown below.

Air direction chamber

(field supply)

More than 1 cm

*3

Inlet side C

More than 1 cm

*2

Outlet side
More than
100 cm

*1

*4

Fig. 2-7

CAUTION

● Concerning inlet-side distance “C” (Fig. 2-7)

The minimum for distance “C” is 15 cm if there are no obstructions on the outlet side
(wall *1 side) and *2 or *4 is not present. In all other cases, the minimum for distance
“C” is 20 cm.

(Obstruction above unit)

*1

A

B

Inlet side
More than 20 cm

(Obstruction on
inlet side)

(Ground)

Fig. 2-8

● If the unit is installed with the outlet side facing wall *1, then there must be no obstruc-

tions on 2 of the remaining 3 sides: *2, *3, *4.

● If wall *1 is on the outlet side (Fig. 2-7), or if obstructions are present on all 3 sides *2,

*3, and *4 (Fig. 2-7), then the minimum distance for “A” and “B” is 2 m (Fig. 2-9). Even
if there is no wall on the outlet side, a minimum of 100 cm is required.

In case of multiple installations

● provide a solid base (concrete block, 10 × 40 cm

beams or equal), a minimum of 15 cm above
ground level to reduce humidity and protect the unit
against possible water damage and decreased ser­vice life. (Fig. 2-9)

● use lug bolts or equal to bolt down unit, reducing

vibration and noise.

Anchor bolts
(4 pieces)

Fig. 2-9

2 - 25

3. Installation Instructions

3-3. Air Discharge Chamber for Top Discharge

Be sure to install an air discharge chamber in the
field when:

● it is difficult to keep a space of min. 50 cm between

the air discharge outlet and an obstacle.

● the air discharge outlet is facing a sidewalk and

discharged hot air may annoy passers-by.
Refer to Fig. 2-10.

3-4. Installing the Unit in Heavy Snow Areas

In locations with strong wind, snow-proof ducting
should be fitted and direct exposure to the wind
should be avoided as much as possible.

■ Countermeasures against snow and wind

In regions with snow and strong wind, the following
problems may occur when the outdoor unit is not pro­vided with a platform and snow-proof ducting:

Design of Mini Multiset

Air discharge

2

Fig. 2-10

In regions with significant snowfall, the outdoor unit should
be provided with a platform and snow-proof duct.

a) The outdoor fan may not run and damage to the

unit may occur.
b) There may be no air flow.
c) The tubing may freeze and burst.
d) The condenser pressure may drop because of

strong wind, and the indoor unit may freeze.

3-5. Precautions for Installation in Heavy Snow

Areas

(1) The platform should be higher than the max. snow

depth. (Fig. 2-11)

(2) The 2 anchoring feet of the outdoor unit should be

used for the platform, and the platform should be
installed beneath the air intake side of outdoor
unit.

(3) The platform foundation must be firm and the unit

must be secured with anchor bolts.

(4) In case of installation on a roof subject to strong

wind, countermeasures must be taken to prevent
the unit from being blown over.

Without snow­proof ducting
(Low platform)

Fig. 2-11

Outdoor
Unit

Duct

With snow­proof ducting
(High platform)

2 - 26

Air
intake

Fig. 2-12

3. Installation Instructions

3-6. Dimensions of Air-Discharge Chamber
Reference diagram for air-discharge chamber (field supply)

***A for GRFMI306-406-506R5I

1 Unit front, air discharge chamber

2 Unit left side, air discharge chamber

3 Unit light side, air discharge chamber

4 Reinforcement brackets, 4 locations

2

Design of Mini Multiset

300

2

24029.5

Rectangular
hole

Rectangular
hole

1

35537317 70

569
54425 25

4

3

250

250

310250

997

1090

3-7. Dimensions of Outdoor Unit with Air-Discharge Chamber (field supply)

GRFMI306-406-506R5I with ***

Wind direction

13

110660170

13

1015

2020

240

Rectangular
hole

Rectangular
hole

29.5

35317537 70

Unit: mm

W

direction

340

68

Wind
direction

1230

Wind
direction

ind

380

405

13

300

544

940

Wind
direction

Wind
direction

18

108997

300

Wind direction

Wind direction

Unit: mm

2 - 27

Design of Mini Multiset

3. Installation Instructions

Reference for air-discharge chamber (field supply)
Required space around outdoor unit

GRFMI306-406-506R5I with ***

If an air discharge chamber is used, the space shown below must be secured around the outdoor unit.
If the unit is used without the required space, a protective device may activate, preventing the unit from operating.

(1) Single-unit installation

The top and both sides must remain open.

CAUTION

If there are obstacles to the front and rear of the outdoor unit,
the obstacle at either the front or rear must be no taller than the
height of the outdoor unit.

(2) Multiple-unit installation

Installation in lateral rows (side-by-side)

More than 300

More than 200

CAUTION

The front and top must remain open.
The obstacles must be no taller than the height of the outdoor unit.

Min. 200

Min. 1000

More than 300

2

Unit: mm

More than 400

Unit: mm

Installation in front-rear rows

intakes or outlets facing outlets

More than 1500

CAUTION

The front and both sides must remain open.

Installation with intakes facing outletsInstallation with intakes facing

More than 400

More than 2000

Unit: mm

2 - 28

Design of Mini Multiset

3. Installation Instructions

3-8. Dimensions of Snow Ducting
Reference diagram for snow-proof vents (field supply)

*** for GRFMI306-406-506R5I

2

1 Unit top, snow-proof vent

2 Unit left side

3 Unit right side

4 Unit reverse side

5 Unit reverse side

6 Unit sides, reinforcement brackets for snow-proof vent

3

233

732

1209

Fastened by screws at
3 locations (also on reverse side)

Fastened by screw at
1 location (also on reverse side)

645

444

388

Fastened by screws at 13 locations

764

95

150

450

500

41

20

500

Unit anchor hole

(7 – ø 7 hole)

730

778

4

1

Unit: mm

302

101

338

500

16

46

2

233

732

1209

3-9. Dimensions of Outdoor Unit with Snow-Proof Vents (field supply)

GRFMI306-406-506R5I with ***

1230

Wind direction

645

Wind direction

1209

764

Wind direction

940

632

179

Wind direction

2020

380 1015

405

Unit: mm

Wind direction

302

732

Wind direction

2 - 29

Design of Mini Multiset

3. Installation Instructions

Reference diagram for snow-proof vents – 1

Space requirements for setting – (1)

GRFMI306-406-506R5I with ***

[Obstacle to the rear of unit]

● Top is open:
(1) Single-unit installation

(2) Obstacles on both sides

Min. A

Min. B

(3) Multiple-unit installation (2 or more units)

Min. E

Min. E Min. E

Min. C

[Obstacle to the front of unit]

● Top is open:

(1) Single-unit installation

Min. D

(2) Multiple-unit installation (2 or more units)

Min. I Min. I

Min. G

GRFMI306-406-506R5I

Outdoor unit

Min. H

Min. J

HI J

500 300 1000

2

Min. F

Outdoor unit

GRFMI306-406-506R5I

AB DCEFG

150

150

200300 300 150 200

Note: In cases 2 and 3 the height of the obstacle

must be no taller than the height of the outdoor
unit.

op is blocked by an obstacle:

● T

Min. L

Min. K

Outdoor unit

GRFMI306-406-506R5I

500 150

K

L

● T

op is blocked by an obstacle:

Min. M

Outdoor unit

GRFMI306-406-506R5I

1

Min. N

MN
000 1000

2 - 30

Unit: mm

Design of Mini Multiset

3. Installation Instructions

Reference diagram for snow-proof vents – 2

Space requirements for setting – (2)

GRFMI306-406-506R5I with ***

[Obstacles to the front and rear of unit]

• The top and both sides must remain open. Either the obstacle to the front or
the obstacle to the rear must be no taller than the height of the outdoor unit.

(1) Single-unit installation

2

Q

Min. P

Dimension Q
If a snow protection duct is

attached after the unit is

installed, verify that dimension Q is 500 mm or more.

Min. O

GRFMI306-406-506R5I

Outdoor unit

OP

1000 150

(2) Obstacles on both sides

Q

Min. 200

Min. 300

Min. 300

Min. 1000

[Installation in front-rear rows]

• The top and both sides must remain open. Either the obstacle to the front or the obstacle
to the rear must be no taller than the height of the outdoor unit.

Min. 300

Min. 1000 Min. 200

Min. 1500 Min. 2000

0

2 - 31

Unit: mm

Dimension Q
If a snow protection duct is

attached after the unit is
installed, verify that dimension
Q is 500 mm or more.

3. Installation Instructions

3-10. Installing the Outdoor Unit

● Use concrete or a similar material to create the base,

and ensure good drainage.

● Ordinarily, ensure a base height of 5 cm or more. If a

drain pipe is used, or for use in cold-weather regions,
ensure a height of 15 cm or more at the feet on both
sides of the unit.
(In this case, leave clearance below the unit for the
drain pipe, and to prevent freezing of drainage water
in cold-weather regions.)

● Refer to the Fig. 3-1 for the anchor bolt dimensions.

● Be sure to anchor the feet with the anchor bolts

(M10). In addition, use anchoring washers on the top
side. (Use large square 32 × 32 SUS washers with
JIS nominal diameters of 10.) (Field supply)

3-11. Drainage Work

Follow the procedure below to ensure adequate drain­ing for the outdoor unit.

● For the drain port dimensions, refer to the figure at

right.

● Ensure a base height of 15 cm or more at the feet on

both sides of the unit.

● When using a drain pipe, install the drain socket

(optional part STK-DS25T) onto the drain port. Seal

the other drain port with the rubber cap supplied with
the drain socket.

● For details, refer to the instruction manual of the

drain socket (optional part ***).

Drain port

Design of Mini Multiset

Drain port (2 locations)

171

219

341

296

13 13

660 111

150

1313

942

Fig. 3-1

20

405

19

15 10380

Anchor bolt (M10)

2

3-12. Routing the Tubing and Wiring

● The tubing and wiring can be extended out in 4 direc-

tions: front, rear, right, and down.

● The service valves are housed inside the unit. To

access them, remove the inspection panel. (To
remove the inspection panel, remove the 3 screws,
then slide the panel downward and pull it toward you.)

(1) If the routing direction is through the front, rear, or

right, use a nipper or similar tool to cut out the
knockout holes for the inter-unit control wiring outlet,
power wiring outlet, and tubing outlet from the
appropriate covers A and B.

(2) If the routing direction is down, use a nipper or simi-

lar tool to cut out the lower flange from cover A.

● Route the tubing so that it does not contact the com-

CAUTION

pressor, panel, or other parts inside the unit. Increased
noise will result if the tubing contacts these parts.

● When routing the tubing, use a tube bender to bend the

tubes.

Inter-unit control wiring outlet

Inspection panel

Cover A

Front

Power wiring outlet

Fig. 3-2

Rear

Cover B
Right

Down

Tubing outlet

2 - 32

2

4. Electrical Wiring

4-1. General Precautions on Wiring

(1) Before wiring, confirm the rated voltage of the unit

as shown on its nameplate, then carry out the
wiring closely following the wiring diagram.

(2) Provide a power outlet to be used exclusively for

each unit, and a power supply disconnect and cir­cuit breaker for overcurrent protection should be
provided in the exclusive line.

(3) To prevent possible hazards from insulation fail-

ure, the unit must be grounded.

(4) Each wiring connection must be done in accor-

dance with the wiring system diagram. Wrong
wiring may cause the unit to misoperate or
become damaged.

(5) Do not allow wiring to touch the refrigerant tubing,

compressor, or any moving parts of the fan.

(6) Unauthorized changes in the internal wiring can be

very dangerous. The manufacturer will accept no
responsibility for any damage or misoperation that
occurs as a result of such unauthorized changes.

Design of Mini Multiset

(7) Regulations on wire diameters differ from locality

to locality. For field wiring rules, please refer to
your LOCAL ELECTRICAL CODES before begin­ning.

You must ensure that installation complies with all
relevant rules and regulations.

(8) To prevent malfunction of the air conditioner

caused by electrical noise, care must be taken
when wiring as follows:

● The remote control wiring and the inter-unit control

wiring should be wired apart from the inter-unit
power wiring.

● Use shielded wires for inter-unit control wiring

between units and ground the shield on both sides.

(9) If the power supply cord of this appliance is dam-

aged, it must be replaced by a repair shop
appointed by the manufacturer, because special
purpose tools are required.

4-2. Recommended Wire Length and Wire Diameter for Power Supply System

Outdoor unit

(A) Power supply

Wire size Max. length

GRFMI306R5I 16 m 25 A
GRFMI406R5I 24 m 35 A
GRFMI506R5I 20 m 35 A

Indoor unit

Type

MAFM

CAFM-SPAFM-KPAFM-SDAFM

A DSAFM

Control wiring

(C) Inter-unit (between outdoor and
indoor units) control wiring

0.75 mm

Use shielded wiring* Use shielded wiring Use shielded wiring

2

(AWG #18)

Max. 1,000 m

(B) Power supply

2

4 mm

2

6 mm

2

6 mm

2.5 mm

Max. 150 m

Max. 130 m

Max. 60 m

2

(D) Remote control wiring (E) Control wiring for group control

0.75 mm

Time delay fuse or
circuit capacity

Time delay fuse or

circuit capacity

10 ~ 16A

10 ~ 16A

10 ~ 16A

2

(AWG #18)

Max. 500 m

0.75 mm

Max. 500 m (Total)

2

(AWG #18)

NOTE

* With ring-type wire terminal.

2 - 33

Design of Mini Multiset

4. Electrical Wiring

4-3. Wiring System Diagram

Power supply
220-240V 50Hz

Remote
controller

1

WHT
BLK

1

2

2

Power supply
220-240V 50Hz

Remote
controller

WHT
BLK

1

1
2

2

Group control:

Power supply
220-240V 50Hz

L
N

Ground

L
N

Ground

L
N

Ground

Indoor
unit (No. 1)

1
2
3

B

U1

D

U2

1
2

C

Indoor
unit (No. 2)

1
2
3

B

U1

D

U2

1
2

C

Ground

Ground

Ground

Outdoor unit
INV unit

L
N

1
2

A

L

Power supply

N

220–240V-1N 50Hz

Ground

2

C

Indoor
unit (No. 3)

1
2
3

B

E

U1
U2

1
2

Ground

C

Indoor

Power supply
220-240V 50Hz

Remote
controller

1

WHT
BLK

1

2

2

L
N

Ground

D

unit (No. n)

B

1
2
3

U1
U2

1
2

Ground

NOTE

(1) Refer to Section 4-2. “Recommended Wire Length

and Wire Diameter for Power Supply System” for the
explanation of “A,” “B,” “C,” “D,” and “E,” in the above
diagram.

(2) The basic connection diagram of the indoor unit

shows the 7P terminal board, so the terminal boards
in your equipment may differ from the diagram.

(3) Refrigerant Circuit (R.C.) address should be set

before turning the power on.

(4) Regarding the R.C. address setting, refer to page 40

of the Installation Instructions. Auto. address setting
can be executed by remote controller automatically.
Refer to page 41~45 of the Installation Instructions.

7P terminal board

U2

1(L) 2(N)
Power

supply

U1
Inter-unit

control wiring

CAFM, SPAFM Type

8P terminal board

1 2 U1 U2 R1 R2

1(L)2(N)
Power

supply

U1

U2

Inter-unit

R1 R2

Remote

controller

control wiring

CAFM1V, CAFM2V, KFM, DSAFM, DSAFMHP

5P terminal board

Power

R1

Remote

controller

12345

1(L)2(N)

supply

control wiring

R2

45

Inter-unit

MAFM Type

2 - 34

Design of Mini Multiset

CAUTION

(1) When linking outdoor units in a network (S-net link system), disconnect the terminal extended from the

short plug (CN003, 2P Black, location: right bottom on the outdoor main control PCB) from all outdoor
units except any one of the outdoor units.
(When shipping: In shorted condition.)

Otherwise the communication of S-net link system is not performed. For a system without link (no con­nection wiring between outdoor units), do not remove the short plug.

(2) Do not install the inter-unit control wiring in a way that forms a loop. (Fig. 4-1)

2

Outdoor unit Outdoor unit Outdoor unit

Prohibited

Indoor unit Indoor unit Indoor unit Indoor unit

Prohibited

Indoor unit

Fig. 4-1

(3) Do not install inter-unit control wiring such as star

branch wiring. Star branch wiring causes mis-address

Outdoor unit

setting.

NO

Outdoor unit Indoor unit Indoor unit Indoor unit

NO

Indoor unit Indoor unit Indoor unit

Branch point

Indoor unit

Fig. 4-2

(4) If branching the inter-unit control wiring, the number of branch points should be 16 or fewer.

(Branches less than 1 m are not included in the total branch number.) (Fig. 4-3)

Branch
point

16 or fewer

Outdoor unit

Indoor unit Indoor unit Indoor unit Indoor unit

more than 1 m

Indoor unit

more than 1 m

Indoor unit

less than 1 m

Indoor unit

Outdoor unit

Indoor unit Indoor unit Indoor unit

Outdoor unit

Fig. 4-3

2 - 35

(5) Use shielded wires for inter-unit control wiring

(c) and ground the shield on both sides, other­wise misoperation from noise may occur.
(Fig. 4-4)
Connect wiring as shown in Section “4-3.
Wiring System Diagram.”

Design of Mini Multiset

Shielded wire

Loose wiring may cause

WARNING

the terminal to overheat or
result in unit malfunction.
A fire hazard may also
exist. Therefore, ensure
that all wiring is tightly
connected.

When connecting each power wire to the terminal,
follow the instructions on “How to connect wiring to
the terminal” and fasten the wire securely with the fix­ing screw of the terminal plate.

How to connect wiring to the terminal

■ For stranded wiring

(1) Cut the wire end with cutting pliers, then strip the

insulation to expose the stranded wiring about 10
mm and tightly twist the wire ends. (Fig. 4-5)

(2) Using a Phillips head screwdriver, remove the ter-

minal screw(s) on the terminal plate.

(3) Using a ring connector fastener or pliers, securely

clamp each stripped wire end with a ring pressure
terminal.

(4) Place the ring pressure terminal, and replace and

tighten the removed terminal screw using a screw­driver. (Fig. 4-6)

Special
washer

Wire

Ground

Strip 10 mm

Screw

Ring pressure
terminal

Terminal plate

Ground

Fig. 4-4

2

Stranded wire

Ring
pressure

terminal

Fig. 4-5

Screw and
Special washer

Ring
pressure

terminal

2 - 36

Wire

Fig. 4-6

Mini Multiset Unit Specifications

Contents

3. Mini Multiset unit specifications

1. Outdoor Unit

1-1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

1-2. Major Component Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

1-3. Dimensional Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

1-4. Refrigerant Flow Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

1-5. Sound Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

3

3 - 1

Mini Multiset Unit Specifications

1. Outdoor Unit

1-1. Specifications

Unit specifications (A)

MODEL No. Outdoor Unit GRFMI306R5I
POWER SOURCE 220 - 230 - 240 V / Single-phase / 50 / 60 Hz
PERFORMANCE Cooling Heating

Capacity kW

BTU / h 38,200 42,700

Air circulation (Hi) m

ELECTRICAL RATINGS

Voltage rating 240 220 230
Available voltage range
Running amperes

Max. running amperes*
Power input kW

Max. power input*
Power factor

COP
Max. starting amperes

FEATURES

Controls Microprocessor
Defrost control Reverse cycle, microprocessor control

Service function

Refrigerant amount at shipment
Refrigerant control Electronic expansion valve

Operation sound (Hi) dB-A

External finish
Color (Approximate value) Munsell 1Y 8.5 / 0.5

Power level
Pressure level

3

/min (cu.ft/min) 100 (3,530)

V
V
A
A 24.0 24.0 24.0 – – –

kW

%8585 85858585

W/W

A

kg

220

14.8 14.1 13.5 15.4 14.7 14.1

2.76 2.76 2.76

4.90 4.90 4.90

4.06 4.06 4.06 4.34 4.34 4.34

Approx. 1 Approx. 1 Approx. 1 Approx. 1 Approx. 1 Approx. 1

11.2 12.5

230

198 – 264

2.88 2.88
–– –

Sensor temp. recall function

Past service warnings recall function

R410A - 3.5

67
51

Galvanized steel plate with powder paint

240

2.88

3

REFRIGERANT TUBING

Limit of tubing length 150 (492)
Limit of elevation difference

between the 2 units
Refrigerant tube

outer diameter
Refrigerant tubing kit / Joint kit Optional

DIMENSIONS & WEIGHT

Unit dimensions

Net weight kg (lbs.)
Shipping weight kg (lbs.)
Shipping volume m

Rated conditions

Cooling: Indoor air temperature 27°C DB / 19°C WB; Outdoor air temperature 35°C DB
Heating: Indoor air temperature 20°C DB; Outdoor air temperature 7°C DB / 6°C WB

*Full-load conditions at Indoor / Outdoor capacity ratio 100%

Cooling: Indoor air temperature 32°C DB / 23°C WB; Outdoor air temperature 43°C DB / 26°C WB

Liquid tube mm (in.)
Gas tube mm (in.)

Height mm (in.)
Width mm (in.)
Depth mm (in.) 340 (13-13/32)

m (ft.)
m (ft.)

3

(cu. ft)

Outdoor unit is higher than indoor unit: 50 (164)

Outdoor unit is lower than indoor unit: 40 (131)

9.52 (3/8)

15.88 (5/8)

Unit dimensions

1230 (48-7/16)

940 (37)

104 (229)
112 (247)

0.56 (19.8)

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

3 - 3

Package

dimensions
1331 (52-13/32)
1016 (40)

415 (16-11/32)

3

Mini Multiset Unit Specifications

1. Outdoor Unit

Unit specifications (B)

MODEL No. Outdoor Unit GRFMI406R5I
POWER SOURCE 220 - 230 - 240 V / Single-phase / 50 / 60 Hz
PERFORMANCE Cooling Heating

Capacity kW

BTU / h 47,800 54,600

Air circulation (Hi) m

ELECTRICAL RATINGS

Voltage rating 240 220 230
Available voltage range
Running amperes

Max. running amperes*
Power input kW

Max. power input*
Power factor

COP
Max. starting amperes

FEATURES

Controls Microprocessor
Defrost control Reverse cycle, microprocessor control

Service function

Refrigerant amount at shipment
Refrigerant control Electronic expansion valve

Operation sound (Hi) dB-A

External finish
Color (Approximate value) Munsell 1Y 8.5 / 0.5

Power level
Pressure level

3

/min (cu.ft/min) 100 (3,530)

V
V
A
A 24.0 24.0 24.0 –– –

kW

%85 85 85 8585 85

W/W

A

kg

220

20.5 19.6 18.8 20.8 19.9 19.1

3.83 3.83 3.83

4.90 4.90 4.90

3.66 3.66 3.66 4.10 4.10 4.10

Approx. 1 Approx. 1 Approx. 1 Approx. 1 Approx. 1 Approx. 1

14.0 16.0

230

198 – 264

3.90 3.90
–– –

Sensor temp. recall function

Past service warnings recall function

R410A - 3.5

67
51

Galvanized steel plate with powder paint

240

3.90

REFRIGERANT TUBING

Limit of tubing length 150 (492)
Limit of elevation difference

between the 2 units
Refrigerant tube

outer diameter
Refrigerant tubing kit / Joint kit Optional

DIMENSIONS & WEIGHT

Unit dimensions

Net weight kg (lbs.)
Shipping weight kg (lbs.)
Shipping volume m

Rated conditions

Cooling: Indoor air temperature 27°C DB / 19°C WB; Outdoor air temperature 35°C DB
Heating: Indoor air temperature 20°C DB; Outdoor air temperature 7°C DB / 6°C WB

*Full-load conditions at Indoor / Outdoor capacity ratio 100%

Cooling: Indoor air temperature 32°C DB / 23°C WB; Outdoor air temperature 43°C DB / 26°C WB

Liquid tube mm (in.)
Gas tube mm (in.)

Height mm (in.)
Width mm (in.)
Depth mm (in.) 340 (13-13/32)

m (ft.)
m (ft.)

3

(cu. ft)

Outdoor unit is higher than indoor unit: 50 (164)

Outdoor unit is lower than indoor unit: 40 (131)

9.52 (3/8)

15.88 (5/8)

Unit dimensions

1230 (48-7/16)

940 (37)

104 (229)
112 (247)

0.56 (19.8)

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

3- 4

Package

1331 (52-13/32)
1016 (40)

dimensions

415 (16-11/32)

Mini Multiset Unit Specifications

1. Outdoor Unit

Unit specifications (C)

MODEL No. Outdoor Unit GRFMI506R5I
POWER SOURCE 220 - 230 - 240 V / Single-phase / 50 / 60 Hz
PERFORMANCE Cooling Heating

Capacity kW

BTU / h 52,900 60,000

Air circulation (Hi) m

ELECTRICAL RATINGS

Voltage rating 240 220 230
Available voltage range
Running amperes

Max. running amperes*
Power input kW

Max. power input*
Power factor

COP
Max. starting amperes

FEATURES

Controls Microprocessor
Defrost control Reverse cycle, microprocessor control

Service function

Refrigerant amount at shipment
Refrigerant control Electronic expansion valve

Operation sound (Hi) dB-A

External finish
Color (Approximate value) Munsell 1Y 8.5 / 0.5

Power level
Pressure level

3

/min (cu.ft/min) 100 (3,530)

V
V
A
A 28.0 28.0 28.0 –– –

kW

%85 85 85 8585 85

W/W

A

kg

220

24.4 23.4 22.4 24.5 23.4 22.5

4.57 4.57 4.57

5.72 5.72 5.72

3.39 3.39 3.39 3.84 3.84 3.84

Approx. 1 Approx. 1 Approx. 1 Approx. 1 Approx. 1 Approx. 1

15.5 17.6

230

198 – 264

4.58 4.58
–– –

Sensor temp. recall function

Past service warnings recall function

R410A - 3.5

68
52

Galvanized steel plate with powder paint

240

4.58

3

REFRIGERANT TUBING

Limit of tubing length 150 (492)
Limit of elevation difference

between the 2 units
Refrigerant tube

outer diameter
Refrigerant tubing kit / Joint kit Optional

DIMENSIONS & WEIGHT

Unit dimensions

Net weight kg (lbs.)
Shipping weight kg (lbs.)
Shipping volume m

Rated conditions

Cooling: Indoor air temperature 27°C DB / 19°C WB; Outdoor air temperature 35°C DB
Heating: Indoor air temperature 20°C DB; Outdoor air temperature 7°C DB / 6°C WB

*Full-load conditions at Indoor / Outdoor capacity ratio 100%

Cooling: Indoor air temperature 32°C DB / 23°C WB; Outdoor air temperature 43°C DB / 26°C WB

Liquid tube mm (in.)
Gas tube mm (in.)

Height mm (in.)
Width mm (in.)
Depth mm (in.) 340 (13-13/32)

m (ft.)
m (ft.)

3

(cu. ft)

Outdoor unit is higher than indoor unit: 50 (164)

Outdoor unit is lower than indoor unit: 40 (131)

9.52 (3/8)

19.05 (3/4)

Unit dimensions

1230 (48-7/16)

940 (37)

104 (229)
112 (247)

0.56 (19.8)

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

3 - 5

Package

dimensions
1331 (52-13/32)
1016 (40)

415 (16-11/32)

3

Mini Multiset Unit Specifications

1. Outdoor Unit

Unit specifications (D)

MODEL No. Outdoor Unit GRFMI306R5I
POWER SOURCE 220 - 230 - 240 V / Single-phase / 50 / 60 Hz
PERFORMANCE Cooling

Capacity kW

BTU / h 38,200

Air circulation (Hi) m

ELECTRICAL RATINGS

Voltage rating 240
Available voltage range
Running amperes

Max. running amperes*
Power input kW

Max. power input*
Power factor

COP
Max. starting amperes

FEATURES

Controls Microprocessor
Service function

Refrigerant amount at shipment
Refrigerant control Electronic expansion valve

Operation sound (Hi) dB-A

External finish
Color (Approximate value) Munsell 1Y 8.5 / 0.5

Power level
Pressure level

3

/min (cu.ft/min) 100 (3,530)

V
V
A
A 24.0 24.0 24.0

kW

%85 85 85

W/W

A

kg

220

14.8 14.1 13.5

2.76 2.76 2.76

4.90 4.90 4.90

4.06 4.06 4.06

Approx. 1 Approx. 1 Approx. 1

Sensor temp. recall function

Past service warnings recall function

Galvanized steel plate with powder paint

11.2

230

198 – 264

R410A - 3.5

67
51

REFRIGERANT TUBING

Limit of tubing length 150 (492)
Limit of elevation difference

between the 2 units
Refrigerant tube

outer diameter
Refrigerant tubing kit / Joint kit Optional

DIMENSIONS & WEIGHT

Unit dimensions

Net weight kg (lbs.)
Shipping weight kg (lbs.)
Shipping volume m

Rated conditions

Cooling: Indoor air temperature 27°C DB / 19°C WB; Outdoor air temperature 35°C DB

*Full-load conditions at Indoor / Outdoor capacity ratio 100%

Cooling: Indoor air temperature 32°C DB / 23°C WB; Outdoor air temperature 43°C DB / 26°C WB

Liquid tube mm (in.)
Gas tube mm (in.)

Height mm (in.)
Width mm (in.)
Depth mm (in.) 340 (13-13/32)

m (ft.)
m (ft.)

3

(cu. ft)

Outdoor unit is higher than indoor unit: 50 (164)

Outdoor unit is lower than indoor unit: 40 (131)

9.52 (3/8)

15.88 (5/8)

Unit dimensions

1230 (48-7/16)

940 (37)

104 (229)
112 (247)

0.56 (19.8)

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Package

1016 (40)

dimensions

1331 (52-13/32)

415 (16-11/32)

3 - 6

Mini Multiset Unit Specifications

1. Outdoor Unit

Unit specifications (E)

MODEL No. Outdoor Unit GRFMI406R5I

POWER SOURCE 220 - 230 - 240 V / Single-phase / 50 / 60 Hz

PERFORMANCE Cooling

Capacity kW

BTU / h 47,800

Air circulation (Hi) m

ELECTRICAL RATINGS

Voltage rating 240
Available voltage range
Running amperes

Max. running amperes*
Power input kW

Max. power input*
Power factor

COP
Max. starting amperes

FEATURES

Controls Microprocessor
Service function

Refrigerant amount at shipment
Refrigerant control Electronic expansion valve

Operation sound (Hi) dB-A

External finish
Color (Approximate value) Munsell 1Y 8.5 / 0.5

Power level
Pressure level

3

/min (cu.ft/min) 100 (3,530)

V
V
A
A 24.0 24.0 24.0

kW

%85 85 85

W/W

A

kg

220

20.5 19.6 18.8

3.83 3.83 3.83

4.90 4.90 4.90

3.66 3.66 3.66

Approx. 1 Approx. 1 Approx. 1

Sensor temp. recall function

Past service warnings recall function

Galvanized steel plate with powder paint

14.0

230

R410A - 3.5

67
51

3

REFRIGERANT TUBING

Limit of tubing length 150 (492)
Limit of elevation difference

between the 2 units
Refrigerant tube

outer diameter
Refrigerant tubing kit / Joint kit Optional

DIMENSIONS & WEIGHT

Unit dimensions

Net weight kg (lbs.)
Shipping weight kg (lbs.)
Shipping volume m

Rated conditions

Cooling: Indoor air temperature 27°C DB / 19°C WB; Outdoor air temperature 35°C DB

*Full-load conditions at Indoor / Outdoor capacity ratio 100%

Cooling: Indoor air temperature 32°C DB / 23°C WB; Outdoor air temperature 43°C DB / 26°C WB

Liquid tube mm (in.)
Gas tube mm (in.)

Height mm (in.)
Width mm (in.)
Depth mm (in.) 340 (13-13/32)

m (ft.)
m (ft.)

3

(cu. ft)

Outdoor unit is higher than indoor unit: 50 (164)

Outdoor unit is lower than indoor unit: 40 (131)

9.52 (3/8)

15.88 (5/8)

Unit dimensions

1230 (48-7/16)

940 (37)

104 (229)
112 (247)

0.56 (19.8)

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Package

dimensions
1331 (52-13/32)
1016 (40)

415 (16-11/32)

3- 7

3

Mini Multiset Unit Specifications

1. Outdoor Unit

Unit specifications (F)

MODEL No. Outdoor Unit GRFMI506R5I
POWER SOURCE 220 - 230 - 240 V / Single-phase / 50 / 60 Hz
PERFORMANCE Cooling

Capacity kW

BTU / h 52,900

Air circulation (Hi) m

ELECTRICAL RATINGS

Voltage rating 240
Available voltage range
Running amperes

Max. running amperes*
Power input kW

Max. power input*
Power factor

COP
Max. starting amperes

FEATURES

Controls Microprocessor
Service function

Refrigerant amount at shipment
Refrigerant control Electronic expansion valve

Operation sound (Hi) dB-A

External finish
Color (Approximate value) Munsell 1Y 8.5 / 0.5

Power level
Pressure level

3

/min (cu.ft/min) 100 (3,530)

V
V
A
A 28.0 28.0 28.0

kW

%85 85 85

W/W

A

kg

220

24.4 23.4 22.4

4.57 4.57 4.57

5.72 5.72 5.72

3.39 3.39 3.39

Approx. 1 Approx. 1 Approx. 1

Sensor temp. recall function

Past service warnings recall function

Galvanized steel plate with powder paint

15.5

230

198 – 264

R410A - 3.5

68
52

REFRIGERANT TUBING

Limit of tubing length 150 (492)
Limit of elevation difference

between the 2 units
Refrigerant tube

outer diameter
Refrigerant tubing kit / Joint kit Optional

DIMENSIONS & WEIGHT

Unit dimensions

Net weight kg (lbs.)
Shipping weight kg (lbs.)
Shipping volume m

Rated conditions

Cooling: Indoor air temperature 27°C DB / 19°C WB; Outdoor air temperature 35°C DB

*Full-load conditions at Indoor / Outdoor capacity ratio 100%

Cooling: Indoor air temperature 32°C DB / 23°C WB; Outdoor air temperature 43°C DB / 26°C WB

Liquid tube mm (in.)
Gas tube mm (in.)

Height mm (in.)
Width mm (in.)
Depth mm (in.) 340 (13-13/32)

m (ft.)
m (ft.)

3

(cu. ft)

Outdoor unit is higher than indoor unit: 50 (164)

Outdoor unit is lower than indoor unit: 40 (131)

9.52 (3/8)

19.05 (3/4)

Unit dimensions

1230 (48-7/16)

940 (37)

104 (229)
112 (247)

0.56 (19.8)

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Package

1016 (40)

dimensions

1331 (52-13/32)

415 (16-11/32)

3 - 8

Mini Multiset Unit Specifications

1. Outdoor Unit

1-2. Major Component Specifications

Outdoor unit (A)

MODEL No. GRFMI306R5I
Power source 220 - 230 - 240 V / 1N / 50 Hz
Controller P.C.B. Ass’y

Control circuit fuse 250V, 6.3A

Compressor

CR-CR365GXH56

INV (Inverter)

Type
Model ... Code No.
Motor rated output
Compressor oil (ETHER FV68S)
Coil resistance V - U: 0.138, U - W: 0.138

(Ambient temperature 25°C)
Safety devices

Thermal protector ON / OFF
Microprocessor safety devices

Crank case heater

High pressure switch

Set pressure ON / OFF

Fan (Number ... diameter (mm))
Fan motor

Model ... Nominal output
No. of pole ... r.p.m.

Safety device

Microprocessor safety devices

Heat exchanger

Coil Aluminum plate fin / Copper tube
Rows…fin pitch mm
Face area m

kW

cc 1,900

Compressor current detection circuit

Compressor discharge gas temperature control

V, W 240, 25

MPa

W

2

UGBTEF – 95STS503 / 504 ... 90W

Rotary (Hermetic)

C-9RVN273H0T ... 808673805

2.1

W - V: 0.138

Propeller (1 ... ø460) ⋅ 2

8 ... 250 – 800

Yes

3 … 1.4

3.25

3

3- 9

Mini Multiset Unit Specifications

1. Outdoor Unit

Outdoor unit (B)

MODEL No. GRFMI406R5I
Power source 220 - 230 - 240 V / 1N / 50 Hz
Controller P.C.B. Ass’y

Control circuit fuse 250V, 6.3A

Compressor

CR-CR365GXH56

INV (Inverter)

3

Type
Model ... Code No.
Motor rated output
Compressor oil (ETHER FV68S)
Coil resistance V - U: 0.138, U - W: 0.138

(Ambient temperature 25°C)
Safety devices

Thermal protector ON / OFF
Microprocessor safety devices

Crank case heater

High pressure switch

Set pressure ON / OFF

Fan (Number ... diameter (mm))
Fan motor

Model ... Nominal output
No. of pole ... r.p.m.

Safety device

Microprocessor safety devices

Heat exchanger

Coil Aluminum plate fin / Copper tube
Rows…fin pitch mm
Face area m

kW

cc 1,900

Compressor current detection circuit

Compressor discharge gas temperature control

V, W 240, 25

MPa

W

2

UGBTEF – 95STS503 / 504 ... 90W

Rotary (Hermetic)

C-9RVN273H0T ... 808673805

3.3

W - V: 0.138

Propeller (1 ... ø460) ⋅ 2

8 ... 250 – 800

Yes

3 … 1.4

3.25

3- 10

Mini Multiset Unit Specifications

1. Outdoor Unit

Outdoor unit (C)

MODEL No. GRFMI506R5I

Power source 220 - 230 - 240 V / 1N / 50 Hz
Controller P.C.B. Ass’y

Control circuit fuse 250V, 6.3A

Compressor

CR-CR605GXH56

INV (Inverter)

Type
Model ... Code No.
Motor rated output
Compressor oil (ETHER FV68S)
Coil resistance V - U: 0.138, U - W: 0.138

(Ambient temperature 25°C)
Safety devices

Thermal protector ON / OFF
Microprocessor safety devices

Crank case heater

High pressure switch

Set pressure ON / OFF

Fan (Number ... diameter (mm))
Fan motor

Model ... Nominal output
No. of pole ... r.p.m.

Safety device

Microprocessor safety devices

Heat exchanger

Coil Aluminum plate fin / Copper tube
Rows…fin pitch mm
Face area m

kW

cc 1,900

Compressor current detection circuit

Compressor discharge gas temperature control

V, W 240, 25

MPa

W

2

UGBTEF – 95STS503 / 504 ... 90W

Rotary (Hermetic)

C-9RVN273H0T ... 808673805

4.0

W - V: 0.138

Propeller (1 ... ø460) ⋅ 2

8 ... 250 – 800

Yes

3 … 1.4

3.25

3

3 - 11

Mini Multiset Unit Specifications

1. Outdoor Unit

Outdoor unit (D)

MODEL No. GRFMI306R5I
Power source 220 - 230 - 240 V / 1N / 50 Hz
Controller P.C.B. Ass’y

Compressor

CR-CR365GXH56

INV (Inverter)

3

Type
Model ... Code No.
Motor rated output
Compressor oil (ETHER FV68S)
Coil resistance V - U: 0.138, U - W: 0.138

(Ambient temperature 25°C)
Safety devices

Thermal protector ON / OFF
Microprocessor safety devices

Crank case heater

High pressure switch

Set pressure ON / OFF

Fan (Number ... diameter (mm))
Fan motor

Model ... Nominal output
No. of pole ... r.p.m.

Safety device

Microprocessor safety devices

Heat exchanger

Coil Aluminum plate fin / Copper tube
Rows…fin pitch mm
Face area m

kW

cc 1,900

Compressor current detection circuit

Compressor discharge gas temperature control

V, W 240, 25

MPa

W

2

UGBTEF – 95STS503 / 504 ... 90W

Rotary (Hermetic)

C-9RVN273H0T ... 808673805

2.1

W - V: 0.138

Propeller (1 ... ø460) ⋅ 2

8 ... 250 – 800

Yes

3 … 1.4

3.25

3 - 12

Mini Multiset Unit Specifications

1. Outdoor Unit

Outdoor unit (E)

MODEL No. GRFMI406R5I
Power source 220 - 230 - 240 V / 1N / 50 Hz
Controller P.C.B. Ass’y

Control circuit fuse 250V, 6.3A

Compressor

CR-CR365GXH56

INV (Inverter)

Type
Model ... Code No.
Motor rated output
Compressor oil (ETHER FV68S)
Coil resistance V - U: 0.138, U - W: 0.138

(Ambient temperature 25°C)
Safety devices

Thermal protector ON / OFF
Microprocessor safety devices

Crank case heater

High pressure switch

Set pressure ON / OFF

Fan (Number ... diameter (mm))
Fan motor

Model ... Nominal output
No. of pole ... r.p.m.

Safety device

Microprocessor safety devices

Heat exchanger

Coil Aluminum plate fin / Copper tube
Rows…fin pitch mm
Face area m

kW

cc 1,900

Compressor current detection circuit

Compressor discharge gas temperature control

V, W 240, 25

MPa

W

2

UGBTEF – 95STS503 / 504 ... 90W

Rotary (Hermetic)

C-9RVN273H0T ... 808673805

3.3

W - V: 0.138

Propeller (1 ... ø460) ⋅ 2

8 ... 250 – 800

Yes

3 … 1.4

3.25

3

3 - 13

Mini Multiset Unit Specifications

1. Outdoor Unit

Outdoor unit (F)

MODEL No. GRFMI506R5I
Power source 220 - 230 - 240 V / 1N / 50 Hz
Controller P.C.B. Ass’y

Control circuit fuse 250V, 6.3A

Compressor

CR-CR605GXH56

INV (Inverter)

3

Type
Model ... Code No.
Motor rated output
Compressor oil (ETHER FV68S)
Coil resistance V - U: 0.138, U - W: 0.138

(Ambient temperature 25°C)
Safety devices

Thermal protector ON / OFF
Microprocessor safety devices

Crank case heater

High pressure switch

Set pressure ON / OFF

Fan (Number ... diameter (mm))
Fan motor

Model ... Nominal output
No. of pole ... r.p.m.

Safety device

Microprocessor safety devices

Heat exchanger

Coil Aluminum plate fin / Copper tube
Rows…fin pitch mm
Face area m

kW

cc 1,900

Compressor current detection circuit

Compressor discharge gas temperature control

V, W 240, 25

MPa

W

2

UGBTEF – 95STS503 / 504 ... 90W

Rotary (Hermetic)

C-9RVN273H0T ... 808673805

4

W - V: 0.138

Propeller (1 ... ø460) ⋅ 2

8 ... 250 – 800

Yes

3 … 1.4

3.25

3 - 14

1. Outdoor Unit

1-3. Dimensional Data

GRFMI306-406-506R5I

274

56

117

60

Mini Multiset Unit Specifications

6

8

8

R19

62

7

8

7

875746

5

6

4

5

150
170

185
210
227

198

4

121

72

168

For R410A only

288

Of the 4 ø32 holes, use 1 of the 2 holes specified

for drain use to install the drain port.

2 x ø32 holes (holes for drain)

Use rubber plugs to seal the remaining 3 holes.

110

66

150

219

R30

405

10380

20

Wind direction

13 13

15
10

1313

Wind

direction

940

Wind

direction

36

60

110

130

141
600

Wind

direction

81

9

3

2

99

20

573

173

197

7

4

8

167
140
120

71

60

5

6

3

70

170

Refrigerant tubing port

Electrical wiring port (ø3.8)

Electrical wiring port (ø2.9)

Electrical wiring port (ø1.9)

Electrical wiring port (ø1.6)

Installation anchoring hole (4-R6.5), anchor bolt: M10

Refrigerant tubing (liquid tube), flared connection (ø9.52)

Refrigerant tubing (gas tube), flared connection (ø15.88)

1

2

3

6

4

5

Auxiliary connection tube (ø15.88 to ø19.05), 6 hp only

7

8

9

18

1230

296

340

3- 15

1. Outdoor Unit

1-4. Refrigerant Flow Diagram

GRFMI306R5I 6
GRFMI406R5I
GRFMI506R5I

Discharge

HPS

Connection diameter
ø15.88 mm

HP removal

STF – 0401G

Mini Multiset Unit Specifications

Suction

LP removal

Cooling cycle
Heating cycle
Brazing BCuP – 3

3

GRFMI306R5I
GRFMI406R5I
GRFMI506R5I

Discharge

HPS

Outside air

C 1

Connection diameter
ø15.88 mm

HP removal

UKV – 30D40

Suction

LP removal

Cooling cycle
Heating cycle
Brazing BCuP – 3

C 1

Outside air

3 - 16

1. Outdoor Unit

1-5. Sound Data

(1) Sound Power Level

GRFMI306R5I
GRFMI406R5I

Mini Multiset Unit Specifications

Model
Sound Power

Level
Condition

90

80

70

60

50

Sound Power Level (dB)

GRFMI306R5I
GRFMI406R5I

67 dB (A)
Cooling

NC – 70

NC – 60

NC – 50

3

40

30

20

10

63 125 250 500 1000 2000 4000 8000

Frequency at center of sound pressure band (Hz)

NC – 40

NC – 30

NC – 20

NOTE

1. dBA = A – weighted sound power level (A – scale according to IEC)

2. Reference acoustic intensity 0 dB = 10

–12

W/m

2

3 - 17

1. Outdoor Unit

GRFMI506R5I

Mini Multiset Unit Specifications

3

Model
Sound Power

Level
Condition

90

80

70

60

50

Sound Power Level (dB)

GRFMI506R5I
68 dB (A)

Cooling

NC – 70

NC – 60

NC – 50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

Frequency at center of sound pressure band (Hz)

NC – 40

NC – 30

NC – 20

NOTE

1. dBA = A – weighted sound power level (A – scale according to IEC)

2. Reference acoustic intensity 0 dB = 10

–12

W/m

2

3- 18

1. Outdoor Unit

(2) Sound Pressure Level

GRFMI306R5I
GRFMI406R5I

Mini Multiset Unit Specifications

90

80

70

60

Model
Sound Pressure Level

Cooling
Condition

GRFMI306R5I
GRFMI406R5I

Front 51 dB (A)
Quiet Mode 48 dB (A)

1 m in front at height of 1.5 m

Front
Quiet Mode

NC – 70

3

NC – 60

50

Octave Band Level (dB)*

40

30

Approximate
minimum audible

20

limit for continuous
noise

10

Overall

* 0 dB = 0.0002 ∝bar

63

NC – 50

NC – 40

NC – 30

NC – 20

125 250 500 1000 2000 4000 8000

Frequency at center of sound pressure band (Hz)

3 - 19

1. Outdoor Unit

GRFMI506R5I

Mini Multiset Unit Specifications

3

90

80

70

60

Model
Sound Pressure Level

Cooling
Condition

GRFMI506R5I
Front 52 dB (A)

Quiet Mode 49 dB (A)
1 m in front at height of 1.5 m

Front
Quiet Mode

NC – 70

NC – 60

50

Octave Band Level (dB)*

40

30

Approximate
minimum audible

20

limit for continuous
noise

10

Overall

* 0 dB = 0.0002 ∝bar

63 125 250 500 1000 2000 4000 8000

NC – 50

NC – 40

NC – 30

NC – 20

Frequency at center of sound pressure band (Hz)

3 - 20

Test Run and Others

Contents

4. Test Run and Others

1. Air Purging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2

2. Test Run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-45

2-1. Preparing for Test Run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

2-2. Test Run Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6

2-3. Outdoor Unit PCB Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7

2-4 Auto Address Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9

2-5. Caution for Pump Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-16

2-6. Meaning of Alarm Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-16

3. Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-18

3-1. General Precautions on Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-18

3-2. Recommended Wire Length and Wire Diameter for Power Supply System . . . . . . . . . . . . . . . . . . . .4-18

3-3. Wiring System Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-19

4. Installation Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-22

4-1. Check of Density Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-22

4-2. Precautions for Installation Using New Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-23

4

4 - 1

1. Air Purging

Test Run and Others

Air and moisture in the refrigerant system may have
undesirable effects as indicated below.

 pressure in the system rises
 operating current rises
 cooling (or heating) efficiency drops
 moisture in the refrigerant circuit may freeze and

block capillary tubing

 water may lead to corrosion of parts in the refriger-

ant system

Therefore, the indoor unit and tubing between the
indoor and outdoor unit must be leak tested and
evacuated to remove any noncondensables and
moisture from the system.

 Air Purging with a Vacuum Pump (for Test Run)

Preparation

Check that each tube (both liquid and gas tubes)
between the indoor and outdoor units has been prop­erly connected and all wiring for the test run has been
completed. Remove the valve caps from both the gas
tube and liquid tube service valves on the outdoor
unit. Note that both liquid and gas tube service valves
on the outdoor unit are kept closed at this stage.

Manifold gauge

Fig. 5-1

Vacuum pump

Outlet
Inlet

Fig. 5-2

Manifold valve

Leak test

(1) Attach a manifold valve (with pressure gauges)

and dry nitrogen gas cylinder to this service port
with charge hoses.

4

CAUTION

Use a manifold valve for air
purging. If it is not available,
use a stop valve for this pur­pose. The “Hi” knob of the
manifold valve must always
be kept closed.

(2) Pressurize the system to no more than 36 kgf/cm

with dry nitrogen gas and close the cylinder valve
when the gauge reading reaches 36 kgf/cm
Then, test for leaks with liquid soap.

T o avoid nitrogen entering

CAUTION

the refrigerant system in a
liquid state, the top of the
cylinder must be higher than
the bottom when you pres­surize the system. Usually ,
the cylinder is used in a ver­tical standing position.
(Refer to the previous page.)

Pressure
gauge

2

G

2

G.

Gas
tube

Liquid
tube

Lo Hi

Cylinder
valve

Open

Open

Charge hose

Nitrogen gas cylinder
(In vertical standing
position)

Service port ø7.94 m

Close

Close

m

Outdoor unit

Fig. 5-3

4 - 2

1. Air Purging

(3) Do a leak test of all joints of the tubing (both

indoor and outdoor) and both gas tube and liquid
tube service valves. Bubbles indicate a leak. Wipe
off the soap with a clean cloth after the leak test.

(4) After the system is found to be free of leaks,

relieve the nitrogen pressure by loosening the
charge hose connector at the nitrogen cylinder.
When the system pressure is reduced to normal,
disconnect the hose from the cylinder.

Evacuation

(1) Attach the charge hose end described in the pre-

ceding steps to the vacuum pump to evacuate the
tubing and indoor unit. Confirm that the “Lo” knob
of the manifold valve is open. Then, run the vacu­um pump. The operation time for evacuation
varies with the tubing length and capacity of the
pump. The following table shows the amount of
time for evacuation:

Required time for evacuation

when 30 gal/h vacuum pump is used

If tubing length is If tubing length is

less than 15 m longer than 15 m

45 min. or more 90 min. or more

Pressure
gauge

Gas
tube

Manifold valve

Lo

Hi

Open

Open

Test Run and Others

Vacuum pum

p
Service port ø7.94 mm

Close

Outdoor unit

NOTE

The required time in the above table is calculated
based on the assumption that the ideal (or target)
vacuum condition is less than 667 Pa (–755 mm Hg,
5 Torr).

(2) When the desired vacuum is reached, close the

“Lo” knob of the manifold valve and turn off the
vacuum pump. Confirm that the gauge pressure is
under 667 Pa (–755 mmHg, 5 Torr) after 4 to 5
minutes of vacuum pump operation.

Liquid
tube

Close

Fig. 5-4

4

4 - 3

1. Air Purging

Fig. 5-6

Test Run and Others

CAUTION

Use a cylinder designed for
use with R410A respectively .

Charging additional refrigerant

 Charging additional refrigerant (calculated from the

liquid tube length as shown in Section 2. 2-7 “Addi­tional Refrigerant Charge”) using the liquid tube
service valve. (Fig. 5-5)

 Use a balance to measure the refrigerant accurately.
 If the additional refrigerant charge amount cannot

be charged at once, charge the remaining refriger­ant in liquid form by using the gas tube service
valve with the system in cooling operation mode at
the time of test run. (Fig. 5-6)

Finishing the job

(1) With a hex wrench, turn the liquid tube service

valve stem counter-clockwise to fully open the
valve.

(2) Turn the gas tube service valve stem counter-

clockwise to fully open the valve.

T o avoid gas from leaking when

CAUTION

removing the charge hose,
make sure the stem of the gas
tube is turned all the way out
(“BACK SEA T” position).

Pressure
gauge

Gas
tube

Liquid
tube

Manifold valve

Lo Hi

Close

Open

Close

Close

Valve

Liquid

R410A

Outdoor unit

(3) Loosen the charge hose connected to the gas

4

tube service port (for ø7.94 mm tube) slightly to
release the pressure, then remove the hose.

(4) Replace the service port cap on the gas tube ser-

vice port and fasten the cap securely with an mon­key spanner or box wrench. This process is very
important to prevent gas from leaking from the
system.

(5) Replace the valve caps at both gas tube and liquid

tube service valves and fasten them securely.

This completes air purging with a vacuum pump. The
air conditioner is now ready for a test run.

Fig. 5-5

Open

Gas
tube

Open

Outdoor unit

Close

Liquid
tube

Open

4 - 4

2. Test Run

Fig. 5-8

2-1. Preparing for Test Run

 Before attempting to start the air conditioner,

check the following.

(1) All loose matter is removed from the cabinet,

especially steel filings, bits of wire, and clips.

(2) The control wiring is correctly connected and all

electrical connections are tight.

(3) The transportation pads for the indoor fan have

been removed. If not, remove them now.

(4) The power has been connected to the unit for at

least 5 hours before starting the compressor. The
bottom of the compressor should be warm to the
touch and the crankcase heater around the feet of
the compressor should be hot to the touch.
(Fig. 5-7)

(5) Both the gas and liquid tube service valves are

open. If not, open them now. (Fig. 5-8)

(6) Request that the customer be present for the trial

run.
Explain the contents of the instruction manual, then
have the customer actually operate the system.

(7) Be sure to give the instruction manual and warran-

ty certificate to the customer.

(8) When replacing the control PCB, be sure to make

all the same settings on the new PCB as were in
use before replacement.
The existing EEP ROM is not changed, and is
connected to the new control PCB.

Test Run and Others

ON

(Power must be turned ON
at least 5 hours before
attempting test run)

Power mains switch

Fig. 5-7

4

Liquid tube service cap

4- 5

Gas tube service cap

2. Test Run

Fig. 5-9

Test Run and Others

2-2. Test Run Procedure

<Outdoor unit control PCB>

Unit No. setting switch

(S004)

(Check the link wiring.)

<Outdoor unit control PCB>

Unit No. setting switch

(S002 and S003)

Refer to Fig. 10-4

Recheck the items to check before the test run.

Set the unit address.

Set the No. of outdoor units.

Set the No. of indoor units.

Are the inter-unit control wires

connected to more than 1 refrigerant

system?

NO

CASE 1

YES

Set the system address.

When multiple outdoor units exist, disconnect the terminals
extended from the shorted plugs (CN33) at all outdoor unit

Alternatively, move the sockets to the OPEN side.

PCBs except for 1.

Is it possible to turn ON the power only

for the 1 refrigerant system where the

test run will be performed?

YES

CASE 2

NO

Items to Check Before the Test Run

1. Turn the remote power switch on at
least 5 hours before the test, in order
to energize the crank case heater.

2. Turn the outdoor service valves (2
locations) to the full-open positions.

 Use caution when making the set-

tings. If there are duplicated system
addresses, or if the settings for the
Nos. of the indoor units are not con­sistent, an alarm will occur and the
system will not start.

 These settings are not made on the

indoor unit PCB.

Turn ON the indoor and

outdoor unit power for that

refrigerant system only.

4

NO

CASE 3B CASE 3A

Is it OK to start the compressors?

Turn ON the indoor and

outdoor unit power.

*2

Short-circuit the mode change pin

(CN50) on the outdoor unit PCB.

At the same time, short-circuit the

automatic address pin (CN51) for 1

second or longer, then pull it out.

*3 *3

Start indoor and outdoor unit

cooling operation.

LED 1 and 2 blink alternately.

Are LEDs 1 and 2 on the

outdoor unit PCB OFF?

Check that test run preparation is OK.

(Do not allow the short-circuited pins to remain short-circuited.)

Set the wired remote controller for test run.

Refer to the remote

controller test-run

settings.

Does system operate?

Return remote control to normal mode

End test run.

Will automatic address setting be

performed in Heating mode?

YES

Is it OK to start the compressors?

Turn ON the indoor and

outdoor unit power.

*2

Short-circuit the automatic address

pin (CN51) on the outdoor unit PCB

for 1 second or longer,

then release it.

Start indoor and outdoor unit

heating operation.

LED 1 and 2 blink alternately.

NO

YES

NO

Check and make corrections according to

YES

Make necessary corrections.

Turn OFF the indoor and

Check the alarm contents.

Make necessary

corrections

Turn OFF the indoor

and outdoor unit

Check the alarm

contents.

“Table of Self Diagnostic Functions.”

Refer to “Table of
Self-Diagnostic Functions and
Description of Alarm Displays.”

*2 A minimum of 5 hours must have passed after the

power was turned ON to the outdoor unit.

*3 All indoor units operate in all refrigerant systems

where the power is ON.

Short-circuit the automatic address pin (CN51)

on the outdoor unit PCB for 1 second or longer,

NO

then release it.

LED 1 and 2 blink alternately

(about 2 or 3 minutes).

Are LEDs 1 and 2 on the

outdoor unit PCB OFF?

YES

4- 6

2. Test Run

Fig. 5-10

2-3. Outdoor Unit PCB Setting

Test Run and Others

CN33

S003

S002

S004

4

CN51
CN50

D043

(LED2)

D042

(LED1)

4-- 7

2. Test Run

Examples of the No. of indoor units settings

Test Run and Others

No. of indoor units

1 unit (factory setting)

2 units

9 units

Indoor unit setting (S004)

(Rotary switch, red)

1

Set to 1

2

Set to 2

9

Set to 9

Examples of refrigerant circuit (R.C.) address settings (required when link wiring is used)

System address No.

System 1 (factory setting)

System 11

System 21

System 30

System address (S003)

(2P DIP switch, blue)

Both OFF

1 ON

2 ON

1 & 2 ON

10 20

ON

ON

ON

ON

ON

2

OFF

1

ON

2

1

OFF

ON

2

OFF

1

ON

2

1

OFF

System address (S002)

(Rotary switch, black)

1

Set to 1

1

Set to 1

1

Set to 1

0

Set to 0

4

4 - 8

2. Test Run

2-4. Auto Address Setting
Basic wiring diagram: Example (1)

• If link wiring is not used
(The inter-unit control wires are not connected to multiple refrigerant systems.)

Indoor unit addresses can be set without operating the compressors.

No. 1 unit settings

Test Run and Others

System address

(system 1 setting)

(S003) (S002)
ON

ON

1

2

1

OFF

Outdoor Unit

Indoor Unit

Remote controller

(S004)

No. of indoor units

(8 units setting)

(S004)

Unit

No. 1

1-1

8

Inter-unit control wiring

1-2 1-3

1-8

Remote controller
cross-over wiring

Fig. 5-11

(1) Automatic Address Setting from the Outdoor Unit

1. On the outdoor unit control PCB, check that the system address rotary switch (S002) is set to “1” and that the
DIP switch (S003) is set to “0.” (These are the settings at the time of factory shipment.)

ON

ON

1

2

OFF

2. To set the number of indoor units that are connected to the outdoor unit to 8, on the outdoor unit control PCB set
the No. of indoor units rotary switch (S004) to “8.”

3. Turn ON the power to the indoor and outdoor units.

4. On the outdoor unit control PCB, short-circuit the automatic address pin (CN51) for 1 second or longer, then
release it.

.

(Communication for automatic address setting begins.)

.

* To cancel, again short-circuit the automatic address pin (CN51) for 1 second or longer, then pull it out.

The LED that indicates that automatic address setting is in progress turns OFF and the process is
stopped.

(Automatic address setting is completed when LEDs 1 and 2 on the outdoor unit control PCB turn OFF.)

.

5. Operation from the remote controllers is now possible.

* To perform automatic address setting from the remote controller, perform steps 1 to 3, then use the remote controller and

complete automatic address setting.
Refer to “Automatic Address Setting from the Remote Controller.”

4

4- 9

2. Test Run

Fig. 5-12

Basic wiring diagram: Example (2)

Test Run and Others

No. 1 unit settings

System address

(system 1 setting)

(S003)

ON

1

2

ON

OFF

(S002)

Outdoor unit

system 1

Indoor unit

1

Remote

controller

 If link wiring is used If link wiring is used

No. of indoor units
(6 units setting)

(S004)

6

Leave the socket

Unit

No. 1

that is used to
short-circuit the
terminal plug.
(CN33)

Inter-unit control wiring

1-1 1-2

*When multiple outdoor units exist, remove the socket that

is used to short-circuit the terminal plug (CN33) from all
outdoor unit PCBs except for 1.
Alternatively, move the sockets to the “OPEN” side.

1-3 1-6

Remote controller
communication wiring

4

No. 2 unit settings

System address

(system 2 setting)

(S003)(S002)

ON

2

1

2

Outdoor unit

system 2

ON

OFF

No. of indoor units

7

(7 units setting)

(S004)

7

Unit

No. 1

Leave the socket
that is used to open
circuit the terminal
plug (CN33).

Inter-unit control wiring

To other system
link wiring

Indoor unit

Remote

controller

2-1 2-2 2-7

Remote controller
cross-over wiring

Make settings as appropriate for the cases listed below.

(Refer to the instructions on the following pages.)

 Indoor and outdoor unit power can be turned ON for each system separately.
 Indoor and outdoor unit power cannot be turned ON for each system separately.

Automatic address setting in Heating mode

Automatic address setting in Cooling mode

Case 1

Case 2
Case 3

4- 10

2. Test Run

Test Run and Others

Case 1

 Indoor and outdoor unit power can be turned ON for each system separately.

Automatic Address Setting (no compressor operation)

Indoor unit addresses can be set without operating the compressors.

Automatic Address Setting from Outdoor Unit

1. On the outdoor unit control PCB, check that the system address rotary switch (S002) is set to “1” and that the
DIP switch (S003) is set to “0.” (These are the settings at the time of factory shipment.)

ON

1

ON

2

OFF

2. To set the number of indoor units that are connected to the outdoor unit to 6, on the outdoor unit control PCB set
the No. of indoor units rotary switch (S004) to “6.”

3. At the outdoor unit where all indoor and outdoor unit power has been turned ON, short-circuit the automatic
address pin (CN51) for 1 second or longer, then pull it out.

.

(Communication for automatic address setting begins.)

.

* To cancel, again short-circuit the automatic address pin (CN51) for 1 second or longer, then pull it out.

The LED that indicates automatic address setting is in progress turns OFF and the process is stopped.

(Automatic address setting is completed when LEDs 1 and 2 on the outdoor unit control PCB turn OFF.)

.

4. Next turn the power ON only for the indoor and outdoor units of the next (different) system. Repeat steps 1 – 3
in the same way to complete automatic address settings for all systems.

.

5. Operation from the remote controllers is now possible.

* To perform automatic address setting from the remote controller, perform steps 1 and 2, then use the remote controller

complete automatic address setting.
Refer to “Automatic Address Setting from the Remote Controller.”

4

4- 11

2. Test Run

Test Run and Others

Case 2

 Indoor and outdoor unit power cannot be turned ON for each system separately.

In the following, automatic setting of indoor unit addresses is not possible if the compressors are not operating.
Therefore perform this process only after completing all refrigerant tubing work.

Automatic Address Setting from Outdoor Unit

1. Perform steps 1 and 2 in the same way as for .

2. Turn the indoor and outdoor unit power ON at all systems.

3. To perform automatic address setting in , on the outdoor unit control PCB in the refrigerant sys-

(Communication for automatic address setting begins, the compressors turn ON, and automatic address

(All indoor units operate.)

Automatic Address Setting in Heating Mode

Case 1

.

Heating mode
tem where you wish to set the addresses, short-circuit the automatic address pin (CN51) for 1 second or longer,
then pull it out.
(Be sure to perform this process for one system at a time. Automatic address settings cannot be performed for
more than one system at the same time.)

.

setting in heating mode begins.)

.

* To cancel, again short-circuit the automatic address pin (CN51) for 1 second or longer, then pull it out.

The LED that indicates automatic address setting is in progress turns OFF and the process is stopped.

4

(Automatic address setting is completed when the compressors stop and LEDs 1 and 2 on the outdoor unit con-

trol PCB turn OFF.)

4. At the outdoor unit in the next (different) system, short-circuit the automatic address pin (CN51) for 1 second or
longer, then pull it out.

.

(Repeat the same steps to complete automatic address setting for all units.)

.

5. Operation from the remote controllers is now possible.

* To perform automatic address setting from the remote controller, perform steps 1 and 2, then use the remote controller

complete automatic address setting.
Refer to “Automatic Address Setting from the Remote Controller.”

4- 12

2. Test Run

Test Run and Others

Case 3

 Indoor and outdoor unit power cannot be turned ON for each system separately.

In the following, automatic setting of indoor unit addresses is not possible if the compressors are not operating.
Therefore perform this process only after completing all refrigerant tubing work.
Automatic address setting can be performed during Cooling operation.

Automatic Address Setting from Outdoor Unit

1. Perform steps 1 and 2 in the same way as for .

2. Turn the indoor and outdoor unit power ON at all systems.

3. To perform automatic address setting in , on the outdoor unit control PCB in the refrigerant sys-

Automatic Address Setting in Cooling Mode

Case 1

.

Cooling mode
tem where you wish to set the addresses, short-circuit the mode change 2P pin (CN50). At the same time,
short-circuit the automatic address pin (CN51) for 1 second or longer, then pull it out. (Be sure to perform this
process for one system at a time. Automatic address settings cannot be performed for more than one system at
the same time.)

.

(Communication for automatic address setting begins, the compressors turn ON, and automatic address
setting in Cooling mode begins.)

(All indoor units operate.)

.

* To cancel, again short-circuit the automatic address pin (CN51) for 1 second or longer, then pull it out.

The LED that indicates automatic address setting is in progress turns OFF and the process is stopped.

(Automatic address setting is completed when the compressors stop and LEDs 1 and 2 on the outdoor unit
control PCB turn OFF.)

4. At the outdoor unit in the next (different) system, short-circuit the automatic address pin (CN51) for 1 second or
longer, then pull it out.

.

(Repeat the same steps to complete automatic address setting for all units.)

.

5. Operation from the remote controllers is now possible.

* Automatic address setting in Cooling mode cannot be done from the remote controller.

Automatic Address Setting from the Remote Controller

Selecting each refrigerant system individually for automatic address setting

---Automatic address setting for each system: Item code “A1”

 Press the remote controller timer time button and button at the

same time. (Press and hold for 4 seconds or longer.)

 Next, press either the temperature setting or button.

(Check that the item code is “A1.”)

 Use either the or button to set the system No. to perform

automatic address setting.

 Then press the button.

(Automatic address setting for one refrigerant system begins.)
(When automatic address setting for one system is completed, the system

returns to normal stopped status.) <Approximately 4 – 5 minutes is required.>
(During automatic address setting, “SETTING” is displayed on the remote controller. This message disappears
when automatic address setting is completed.)

 Repeat the same steps to perform automatic address setting for each successive system.

4

4- 13

Test Run and Others

2. Test Run

Display during automatic address setting

 On outdoor unit PCB

1

2

LED

Blink alternately

* When automatic address setting has been successfully completed, both LEDs 1 and 2 turn OFF.
* LED 1 is D042. LED 2 is D043.
* If automatic address setting is not completed successfully, refer to the table below and correct the problem.

Then perform automatic address setting again.

 Display details of LEDs 1 and 2 on the outdoor unit control PCB

( : ON : Blinking : OFF)

LED 1 LED 2

* Do not short-circuit the automatic address setting pin (CN51) again while automatic

address setting is in progress. Doing so will cancel the setting operation and will cause
LEDs 1 and 2 to turn OFF.

:

Display meaning

After the power is turned ON (and automatic address setting is not in progress), no communication with the indoor
units in that system is possible.

After the power is turned ON (and automatic address setting is not in progress), 1 or more indoor units are
confirmed in that system; however, the number of indoor units does not match the number that was set.

Alternating

Simultaneous

Alternating

Note: indicates that the solenoid is fused or that there is a CT (current detection circuit) failure (current is detected when

the compressor is OFF).

 Remote controller display during automatic setting

Automatic address setting is in progress.
Automatic address setting completed.

At time of automatic address setting, the number of indoor units did not match the number that was set.

(when indoor units are operating) indication appears on the display.

Refer to Table of Self-Diagnostic Functions and Description of Alarm Displays.

is blinking

4

4- 14

Test Run and Others

2. Test Run

Request concerning recording the indoor/outdoor unit combination Nos.

After automatic address setting has been completed, be sure to record them for future reference.
List the outdoor unit system address and the addresses of the indoor units in that system in an easily visible location

(next to the nameplate), using a permanent marking pen or similar means that cannot be erased easily.

Example: (Outdoor) 1 – (Indoor) 1-1, 1-2, 1-3… (Outdoor) 2 – (Indoor) 2-1, 2-2, 2-3…
These numbers are necessary for later maintenance. Please be sure to indicate them.

Checking the indoor unit addresses

Use the remote controller to check the indoor unit address.

<If 1 indoor unit is connected to 1 remote controller>

1. Press and hold the button and button for 4 seconds or longer (simple settings mode).

2. The address is displayed for the indoor unit that is connected to the remote controller.
(Only the address of the indoor unit that is connected to the remote controller can be checked.)

3. Press the button again to return to normal remote controller mode.

<If multiple indoor units are connected to 1 remote controller (group control)>

1. Press and hold the button and button for 4 seconds or longer (simple settings mode).

2. “ALL” is displayed on the remote controller.

3. Next, press the button.

4. The address is displayed for 1 of the indoor units which is connected to the remote controller. Check that the
fan of that indoor unit starts and that air is discharged.

5. Press the button again and check the address of each indoor unit in sequence.

6. Press the button again to return to normal remote controller mode.

Indoor unit address

Number changes to indicate which indoor unit is currently selected.

Remote Controller Test Run Settings

1. Press the remote controller button for 4 seconds or longer. Then press the button.

 “TEST” appears on the LCD display while the test run is in progress.
 The temperature cannot be adjusted when in Test Run mode.

(This mode places a heavy load on the machines. Therefore use it only when performing the test run.)

2. The test run can be performed using the HEAT, COOL, or FAN operation modes.

Note: The outdoor units will not operate for approximately 3 minutes after the power is turned ON and after

operation is stopped.

3. If correct operation is not possible, a code is displayed on the remote controller display.
(Refer to “2-6. Meaning of Alarm Messages” and correct the problem.)

4. After the test run is completed, press the button again. Check that “TEST” disappears from the remote con­troller display.
(To prevent continuous test runs, this remote controller includes a timer function that cancels the test run after
60 minutes.)

* If the test run is performed using the wired remote controller, operation is possible even if the cassette-type ceil-

ing panel has not been installed. (“P09” display does not occur.)

4- 15

4

Test Run and Others

2. Test Run

2-5. Caution for Pump Down

Pump down means refrigerant gas in the system is
returned to the outdoor unit. Pump down is used
when the unit is to be moved, or before servicing the
refrigerant circuit.

 This outdoor unit cannot collect more than the rated refrigerant amount as shown

CAUTION

2-6. Meaning of Alarm Messages

Table of Self-Diagnostics Functions and Description of Alarm Displays

Alarm messages are indicated by the blinking of LED 1 and 2 (D72, D75) on the outdoor unit PCB. They are also displayed on
the wired remote controller.

 Viewing the LED 1 and 2 (D72 and D75) alarm displays

by the nameplate on the back.

 If the amount of refrigerant is more than that recommended, do not conduct pump

down. In this case use another refrigerant collecting system.

4

LED 1

LED 2

Alarm display

Alternating

LED 1 blinks M times, then LED 2 blinks N times. The cycle then repeats.

M = 2: P alarm 3: H alarm 4: E alarm 5: F alarm 6: L alarm

N = Alarm No.
Example: LED 1 blinks 2 times, then LED 2 blinks 17 times. The cycle then repeats.
Alarm is “P17.”

( : Blinking)

Possible cause of malfunction

Serial commu­nication errors
Mis-setting

Remote controller is detecting
error signal from indoor unit.

Indoor unit is detecting error signal from remote controller (and system controller).
Indoor unit is detecting error

signal from outdoor unit.

Improper setting of indoor unit or
remote controller.

During auto. address setting,
number of connected units does
not correspond to number set.

When turning on the power
supply, number of connected
units does not correspond to
number set.

(Except R.C. address is “0.”)
Indoor unit communication error

of group control wiring.

Alarm contents

Error in receiving serial communication signal.
(Signal from main indoor unit in case of group control)

Ex: Auto address is not completed.

Error in transmitting serial communication signal.

Error in receiving serial communication signal.

When turning on the power supply, the number of connected

indoor units does not correspond to the number set. (Except R.C.

address is “0.”)
Error of the outdoor unit in receiving serial communication signal

from the indoor unit.
Indoor unit address setting is duplicated.

Remote controller address connector (RCU. ADR) is duplicated.
(Duplication of main remote controller)

Starting auto. address setting is prohibited.
This alarm message shows that the auto address connector CN100

is shorted while other RC line is executing auto address operation.

Error in auto. address setting. (Number of connected indoor units
is less than the number set)

Error in auto. address setting. (Number of connected indoor units

is more than the number set)

No indoor unit is connected during auto. address setting.

Error of outdoor unit address setting.
Error of main indoor unit in receiving serial communication signal

from sub indoor units.

Alarm

message

<E01>

<E02>

<<E03>>

E04

<E06>

E08

<<E09>>

E12

E15
E16

E20
E25

E18

Continued

4- 16

2. Test Run

Test Run and Others

Possible cause of malfunction

Serial commu­nication errors
Mis-setting

Activation of
protective

device

Thermistor
fault

EEPROM on indoor unit PCB failure
Protective

device for
compressor is
activated

Improper setting.

Protective device in indoor unit
is activated.

Indoor thermistor is either open
or damaged.

Outdoor thermistor is either
open or damaged.

Protective device for compressor
No. 1 is activated.

Alarm

This alarm message shows when the indoor unit for multiple-use
is not connected to the outdoor unit.

Duplication of main indoor unit address setting in group control.
Duplication of outdoor R.C. address setting.
There are 2 or more indoor units

controllers which have operation
mode priority in 1

Group control wiring is connected to individual control indoor unit.
Indoor unit address is not set.
Capacity code of indoor unit is not set.
Capacity code of outdoor unit is not set.
Mis-matched connection of outdoor units which have different

kinds of refrigerant.

4-way valve operation failure

Thermal protector in indoor unit fan motor is activated.
Improper wiring connections of ceiling panel.
Float switch is activated.

Power supply voltage is unusual. (The voltage is more than 260 V
or less than 160 V between L and N phase.)

Incorrect discharge temperature. (Comp. No. 1)
Operation of O

Outdoor unit fan motor is unusual.
Compressor running failure resulting from missing phase in the

compressor wiring, etc. (Start failure not caused by IPM or no gas.)
Overcurrent at time of compressor runs more than 80Hz (DCCT

secondary current or ACCT primary current is detected at a time
other than when IPM has tripped.)

IPM trip (IPM current or temperature)
Inverter for compressor is unusual. (DC compressor does not

operate.)
Indoor coil temp. sensor (E1)

Indoor coil temp. sensor (E2)
Indoor coil temp. sensor (E3)
Indoor suction air (room) temp. sensor (TA)

Indoor discharge air temp. sensor (BL)

Compressor discharge gas temp. sensor (TD) F04

Outdoor No. 1 coil liquid temp. sensor
Outdoor air temp. sensor (TO)
Compressor suction port temperature sensor (TS)

High pressure sensor

EEPROM on the outdoor unit PCB is a failure.

Current is not detected when comp. is ON.

refrigerant circuit.

2 sensor

Priority set remote

Non-priority set remote

(C1)

controller

controller

message

L02

<L03>

L04
L05

L06
L07

L08

<<L09>>

L10

L17

L18

<<P01>>
<<P09>>
<<P10>>

P02

P03
P14
P22

P16

P26

H31
P29

<<F01>>
<<F02>>

<<F03>>
<<F10>>

<<F11>>

F07
F08
F12
F16
F29

F31

H03

4

4- 17

3. Electrical Wiring

* With ring-type wire terminal.

3-1. General Precautions on Wiring

(1) Before wiring, confirm the rated voltage of the unit

as shown on its nameplate, then carry out the
wiring closely following the wiring diagram.

(2) Provide a power outlet to be used exclusively for

each unit, and a power supply disconnect and cir­cuit breaker for overcurrent protection should be
provided in the exclusive line.

(3) To prevent possible hazards from insulation fail-

ure, the unit must be grounded.

(4) Each wiring connection must be done in accor-

dance with the wiring system diagram. Wrong
wiring may cause the unit to misoperate or
become damaged.

(5) Do not allow wiring to touch the refrigerant tubing,

compressor, or any moving parts of the fan.

(6) Unauthorized changes in the internal wiring can be

very dangerous. The manufacturer will accept no
responsibility for any damage or misoperation that
occurs as a result of such unauthorized changes.

Test Run and Others

(7) Regulations on wire diameters differ from locality

to locality. For field wiring rules, please refer to
your LOCAL ELECTRICAL CODES before begin­ning.

You must ensure that installation complies with all
relevant rules and regulations.

(8) To prevent malfunction of the air conditioner

caused by electrical noise, care must be taken
when wiring as follows:

 The remote control wiring and the inter-unit control

wiring should be wired apart from the inter-unit
power wiring.

 Use shielded wires for inter-unit control wiring

between units and ground the shield on both sides.

(9) If the power supply cord of this appliance is dam-

aged, it must be replaced by a repair shop
appointed by the manufacturer, because special
purpose tools are required.

4

3-2. Recommended Wire Length and Wire Diameter for Power Supply System

Outdoor unit

(A) Power supply

Wire size Max. length

GRFMI306R5I 16 m 25 A
GRFMI406R5I 24 m 35 A
GRFMI506R5I

Indoor unit

Type

MAFM

DSAFM, CAFM, SPAFM, KPAFM, SDAFM

ADSAFMHP

Control wiring

(C) Inter-unit (between outdoor and
indoor units) control wiring

0.75 mm

Use shielded wiring* Use shielded wiring Use shielded wiring

2

(AWG #18)

Max. 1,000 m

2

4 mm

2

6 mm

2

6 mm

(B) Power supply

Max. 150 m
Max. 130 m

Max. 60 m

20 m 35 A

2.5 mm

2

(D) Remote control wiring (E) Control wiring for group control

Time delay fuse or
circuit capacity

Time delay fuse or

circuit capacity

10 ~ 16A
10 ~ 16A
10 ~ 16A

2

0.75 mm

(AWG #18)

Max. 500 m

0.75 mm

2

(AWG #18)

Max. 500 m (Total)

NOTE

4- 18

3. Electrical Wiring

(1) Refer to Section 3-2. “Recommended Wire Length

and Wire Diameter for Power Supply System” for
the explanation of “A,” “B,” “C,” “D,” and “E,” in the
above diagram.

(2) The basic connection diagram of the indoor unit

shows the 7P terminal board, so the terminal
boards in your equipment may differ from the dia­gram.

(3) Refrigerant Circuit (R.C.) address should be set

before turning the power on.

(4) Regarding the R.C. address setting, refer to page

5-8. Auto. address setting can be executed by
remote controller automatically. Refer to page

5-9 – 5-13.

3-3. Wiring System Diagram

Test Run and Others

Power supply
220-240V 50Hz

Remote
controller

1

WHT
BLK

1

2

2

Power supply
220-240V 50Hz

Remote
controller

WHT
BLK

1

1
2

2

Group control:

Power supply
220-240V 50Hz

L
N

Ground

L
N

Ground

L
N

Ground

Indoor
unit (No. 1)

1
2
3

B

U1

D

U2

1
2

C

Indoor
unit (No. 2)

1
2
3

B

U1

D

U2

1
2

C

Ground

Ground

Ground

Outdoor unit
INV unit

L
N

1
2

A

L

Power supply

N

220–240V-1N 50Hz

Ground

C

Indoor
unit (No. 3)

1
2
3

B

E

U1

U2

1
2

Ground

C

Indoor

Power supply
220-240V 50Hz

Remote
controller

WHT
BLK

1

1
2

2

L
N

Ground

D

unit (No. n)

B

Ground

NOTE

1
2
3

U1
U2

1
2

1(L) 2(N)
Power

supply

7P terminal board

U2

U1

Inter-unit

control wiring

R1

R2

Remote

controller

4

*** CAFM, SPAFM Type

8P terminal board

1 2 U1 U2 R1 R2

1(L)2(N)
Power
supply

U1

U2

Inter-unit

control wiring

R1R2

Remote

controller

5P terminal board

12345

1(L)2(N)

Power

supply

45

Inter-unit

control wiring

CAFM1V, CAFM2V, KFM, DSAFM, DSAFMHP Types MAFM Type

4- 19

Test Run and Others

3. Electrical Wiring

CAUTION

(1) When linking outdoor units in a network (S-net link system), disconnect the terminal extended from the

short plug (CN003, 2P Black, location: right bottom on the outdoor main control PCB) from all outdoor
units except any one of the outdoor units.
(When shipping: In shorted condition.)

Otherwise the communication of S-net link system is not performed. For a system without link (no con­nection wiring between outdoor units), do not remove the short plug.

(2) Do not install the inter-unit control wiring in a way that forms a loop. (Fig. 5-13)

Outdoor unit Outdoor unit Outdoor unit

Prohibited

Prohibited

4

Indoor unit Indoor unit Indoor unit Indoor unit

Fig. 5-13

(3) Do not install inter-unit control wiring such as star

branch wiring. Star branch wiring causes mis-address
setting.

NO

Outdoor unit Indoor unit Indoor unit Indoor unit

NO

(4) If branching the inter-unit control wiring, the number of branch points should be 16 or fewer.

(Branches less than 1 m are not included in the total branch number.) (Fig. 5-15)

Outdoor unit

Indoor unit Indoor unit Indoor unit

Branch point

Fig. 5-14

Outdoor unit

Indoor unit

Outdoor unit

Indoor unit

Outdoor unit

Branch
point

16 or fewer

Indoor unit Indoor unit Indoor unit Indoor unit

more than 1 m

Indoor unit

more than 1 m

Indoor unit

less than 1 m

Indoor unit

Indoor unit Indoor unit Indoor unit

Fig. 5-15

4- 20

3. Electrical Wiring

Fig. 5-18

(5) Use shielded wires for inter-unit control wiring

(c) and ground the shield on both sides, other­wise misoperation from noise may occur.
(Fig. 5-16)
Connect wiring as shown in Section “3-3.
Wiring System Diagram.”

Test Run and Others

Shielded wire

Loose wiring may cause

WARNING

the terminal to overheat or
result in unit malfunction.
A fire hazard may also
exist. Therefore, ensure
that all wiring is tightly
connected.

When connecting each power wire to the terminal, fol­low the instructions on “How to connect wiring to the
terminal” and fasten the wire securely with the fixing
screw of the terminal plate.

How to connect wiring to the terminal
 For stranded wiring

(1) Cut the wire end with cutting pliers, then strip the

insulation to expose the stranded wiring about 10
mm and tightly twist the wire ends. (Fig. 5-17)

(2) Using a Phillips head screwdriver, remove the ter-

minal screw(s) on the terminal plate.

(3) Using a ring connector fastener or pliers, securely

clamp each stripped wire end with a ring pressure
terminal.

(4) Place the ring pressure terminal, and replace and

tighten the removed terminal screw using a screw­driver. (Fig. 5-18)

Special
washer

Wire

Ground

Strip 10 mm

Screw

Ring pressure
terminal

Terminal plate

Ground

Fig. 5-16

Stranded wire

Ring
pressure

terminal

Fig. 5-17

4

Screw and
Special washer

Ring
pressure

terminal

4- 21

Wire

4. Installation Standards

Test Run and Others

4

4-1. Check of Density Limit
The room in which the air conditioner is to be

installed requires a design that in the event of
refrigerant gas leaking out, its density will not
exceed a set limit.

The refrigerant (R410A), which is used in the air condi­tioner, is safe, without the toxicity or combustibility of
ammonia, and is not restricted by laws imposed to pro­tect the ozone layer. However, since it contains more
than air, it poses the risk of suf focation if its density
should rise excessively . Suffocation from leakage of
refrigerant is almost non-existent. With the recent
increase in the number of high density buildings, how­ever, the installation of multi air conditioner systems is
on the increase because of the need for effective use
of floor space, individual control, energy conservation
by curtailing heat and carrying power, etc.
Most importantly, the multi air conditioner system is
able to replenish a large amount of refrigerant com­pared to conventional individual air conditioners. If a
single unit of the multi air conditioner system is to be
installed in a small room, select a suitable model and
installation procedure so that if the refrigerant acci­dentally leaks out, its density does not reach the limit
(and in the event of an emergency, measures can be
made before injury can occur).
In a room where the density may exceed the limit,
create an opening with adjacent rooms, or install
mechanical ventilation combined with a gas leak
detection device. The density is as given below.

Total amount of refrigerant (kg)

Min. volume of the indoor unit installed room (m3)

= Density limit (kg/m

The density limit of refrigerant which is used in multi air con-

3

ditioners is 0.3 kg/m

(ISO 5149).

3

)

2. The standards for minimum room volume are as
follows.

(1) No partition (shaded portion)

(2) When there is an effective opening with the adja-

cent room for ventilation of leaking refrigerant gas
(opening without a door, or an opening 0.15% or
larger than the respective floor spaces at the top
or bottom of the door).

Outdoor unit

Refrigerant tubing

Indoor unit

(3) If an indoor unit is installed in each partitioned

room and the refrigerant tubing is interconnected,
the smallest room of course becomes the object.
But when mechanical ventilation is installed inter­locked with a gas leakage detector in the smallest
room where the density limit is exceeded, the vol­ume of the next smallest room becomes the object.

Refrigerant tubing

Outdoor unit

Very
small
room

Small
room

Mechanical ventilation device – Gas leak detector

Medium
room

Large room

Indoor unit

NOTE

1. If there are 2 or more refrigerating systems in a sin­gle refrigerating device, the amount of refrigerant
should be as charged in each independent device.

For the amount of charge in this example:

Outdoor unit

e.g., charged
amount (10 kg)

Indoor unit

Room A Room B Room C Room D Room E Room F

The possible amount of leaked refrigerant gas in rooms
A, B and C is 10 kg.
The possible amount of leaked refrigerant gas in rooms
D, E and F is 15 kg.

e.g., charged
amount (15 kg)

3. The minimum indoor floor space compared with the
amount of refrigerant is roughly as follows (when
the ceiling is 2.7 m high):

40

Range below the

2

35

m

4- 22

density limit
of 0.3 kg/m

30

(countermeasures
not needed)

25
20
15

10

5

Min. indoor floor space

0

3

10 20 30

Total amount of refrigerant

Range above
the density limit
of 0.3 kg/m
(countermeasures
needed)

3

kg

Test Run and Others

R407C tools

Item compatible Remarks

with R410A?

Manifold gauge Y es No Types of refrigerant, refrigerating machine oil, and

pressure gauge are different.
Charge hose Yes No To resist higher pressure, material must be changed.
Vacuum pump Yes Yes Use a conventional vacuum pump if it is equipped

with a check valve. If it has no check valve,

purchase and attach a vacuum pump adapter.
Leak detector Yes No Leak detectors for CFC and HCFC that

react to chlorine do not function because

R410A contains no chlorine. Leak detector

for HFC134a can be used for R410A.
Flaring oil Yes No For systems that use R22, apply mineral oil (Suniso oil)

to the flare nuts on the tubing to prevent refrigerant

leakage. For machines that use R407C or R410A, apply

synthetic oil (ether oil) to the flare nuts.

* Using tools for R22 and R407C and new tools for R410A together can cause defects.

4. Installation Standards

4-2. Precautions for Installation Using New Refrigerant
4-2-1. Care regarding tubing

(1) Process tubing

 Material: Use C1220 phosphorous deoxidized copper specified in JIS H3300 “Copper and Copper Alloy Seam-

less Pipes and Tubes.”

 Tubing size: Be sure to use the sizes indicated in the table below.
 Use a tube cutter when cutting the tubing, and be sure to remove any flash. This also applies to distribution

joints (optional).

 When bending tubing, use a bending radius that is 4 times the outer diameter of the tubing or larger.

Use sufficient care in handling the tubing. Seal the tubing ends with

Copper tube

CAUTION

Material O

Outer diameter 6.35 9.52 12.7 15.88 19.05
Wall thickness 0.8 0.8 0.8 1.0 1.0

caps or tape to prevent dirt, moisture, or other foreign substances
from entering. These substances can result in system malfunction.

Unit: mm

(2) Prevent impurities including water, dust and oxide from entering the tubing. Impurities can cause R410A

refrigerant deterioration and compressor defects. Due to the features of the refrigerant and refrigerating
machine oil, the prevention of water and other impurities becomes more important than ever.

4-2-2. Be sure to recharge the refrigerant only in liquid form.

(1) Since R410A is a non-azeotrope, recharging the refrigerant in gas form can lower performance and cause

defects of the unit.

(2) Since refrigerant composition changes and performance decreases when gas leaks, collect the remaining

refrigerant and recharge the required total amount of new refrigerant after fixing the leak.

4-2-3. Different tools required

(1) Tool specifications have been changed due to the characteristics of R410A.

Some tools for R22- and R407C-type refrigerant systems cannot be used.

New
tool?

4- 23

4

Manifold gauge

Vacuum pump

Outlet
Inlet

4. Installation Standards

Test Run and Others

(2) Use R410A exclusive cylinder only.

Valve

Single-outlet valve

(with siphon tube)
Liquid refrigerant should be recharged
with the cylinder standing on end as
shown.

Liquid

4

4- 24

R.D. 28 Reyrieux BP 131-01601 Tré voux CEDEX France

Té l. 04.74.00.92.92 - Fax [phone]

R.C.S. Bourg-en-Bresse B 759 200 728