Toshiba MMY-MAP0801FT8, MMY-MAP1201FT8, MMY-MAP1001FT8 Manual

FILE NO. A04-002

INSTALLATION MANUAL

R410A

Heat RecoveryType

Indoor Unit

<4-way Air Discharge Cassette Type>

MMU-AP0091H, AP0121H, AP0151H, MMU-AP0181H, AP0241H, AP0271H, MMU-AP0301H, AP0361H, AP0481H MMU-AP0561H

<2-way Air Discharge Cassette Type>

MMU-AP0071WH, AP0091WH, AP0121WH, MMU-AP0151WH, AP0181WH, AP0241WH, MMU-AP0271WH, AP0301WH, AP0481WH*

* CHINA market only

<1-way Air Discharge Cassette Type>

MMU-AP0071YH, AP0091YH, AP0121YH, MMU-AP0151SH, AP0181SH, AP0241SH

<Concealed Duct Standard Type>

MMD-AP0071BH, AP0091BH, AP0121BH, MMD-AP0151BH, AP0181BH, AP0241BH, MMD-AP0271BH, AP0301BH, AP0361BH, MMD-AP0481BH, AP0561BH

<Concealed Duct High Static Pressure Type>

MMD-AP0181H, AP0241H, AP0271H, MMD-AP0361H, AP0481H

<Under Ceiling Type>

MMC-AP0151H, AP0181H, AP0241H, MMC-AP0271H, AP0361H, AP0481H

<High Wall Type>

MMK-AP0071H, AP0091H, AP0121H, MMK-AP0151H, AP0181H, AP0241H

<Floor Standing Cabinet Type>

MML-AP0071H, AP0091H, AP0121H, MML-AP0151H, AP0181H, AP0241H

<Floor Standing Concealed Type>

MML-AP0071BH, AP0091BH, AP0121BH, MML-AP0151BH, AP0181BH, AP0241BH

<Floor Standing Type>

MMF-AP0151H, AP0181H, AP0241H MMF-AP0271H, AP0361H, AP0481H MMF-AP0561H

Outdoor Unit

<Inverter Unit>

MMY-MAP0801FT8 MMY-MAP1001FT8 MMY-MAP1201FT8

FS unit

RBM-Y1121FE

RBM-Y1801FE

PRINTED IN JAPAN, Aug, 2004 ToMo

WARNINGS ON REFRIGERANT LEAKAGE

Check of Concentration 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 concentration 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 to be imposed which protect the ozone layer. However, since it contains more than air, it poses the risk of suffocation if its concentration should rise excessively. Suffocation from leakage of R410A is almost non-existent. With the recent increase in the number of high concentration 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 with conventional individual air conditioners. If a single unit of the multi 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 concentration 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 concentration may exceed the limit, create an opening with adjacent rooms, or install mechanical ventilation combined with a gas leak detection device.

The concentration is as given below.

Total amount of refrigerant (kg)

Min. volume of the indoor unit installed room (m³) ≤ Concentration limit (kg/m³)

The concentration limit of R410A which is used in multi air conditioners is 0.3kg/m³.

NOTE 1 :

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

Outdoor unit

e.g., charged

amount (10kg) e.g.,

charged amount (15kg)

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

Indoor unit

For the amount of charge in this example:

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

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

Important

NOTE : 2

The standards for minimum room volume are as follows.

(1) No partition (shaded portion)

(2)When there is an effective opening with the adjacent 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 piping

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 a 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 piping
			Outdoor unit
	Very
	small		Indoor unit
	room
	Small	Medium	Large room
	room	room

Mechanical ventilation device - Gas leak detector

NOTE 3 :

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

	40
m² 35		Range below the
		density limit
	30	of 0.3 kg/m³
		(countermeasures
	25	not needed)
area
	20
floor	15		Range above
			the density limit
indoor	10		of 0.3 kg/m³
			(countermeasures
			needed)
Min.	5
	0
		10	20	30
		Total amount of refrigerant			kg

NOTE

A direct current motor is adopted for indoor fan motor in the Concealed Duct Standard Type air conditioner. Caused from its characteristics, a current limit works on the direct current motor. When replacing the highperformance filter or when opening the service panel, be sure to stop the fan. If an above action is executed during the fan operation, the protective control works to stop the unit operation, and the check code “P12” may be appear. However it is not a trouble. When the desired operation has finished, be sure to reset the system to clear “P12” error code using the electric leak breaker of the indoor unit. Then push the operation ON/OFF button of the remote controller to return to the usual operation.

	CONTENTS
1.	SELECTING A LOCATION FOR INSTALLATION .....................................	4
2.	SAFETY NOTES .........................................................................................	8
3.	CHECK POINTS .........................................................................................	9
4.	KEY POINTS OF AIR CONDITIONER INSTALLATION ..........................	10
5.	REFRIGERANT PIPE INSTALLATION ....................................................	11
6.	INDOOR UNIT INSTALLATION ................................................................	41
7.	FLOW SELECTOR UNIT INSTALLATION ...............................................	77
8.	OUTDOOR UNIT INSTALLATION ............................................................	81
9.	ELECTRIC WIRING ..................................................................................	87
10.	INDOOR UNIT TERMINAL BOARD PLACEMENT AND WIRING .........	102
11.	DRAIN PIPE INSTALLATION .................................................................	107
12.	ADJUSTMENT OF AIR DIRECTION......................................................	115
13.	APPLIED CONTROL ..............................................................................	119
14.	ADDRESS SETUP..................................................................................	123
15.	TEST OPERATION .................................................................................	136
16.	SUPPORT FUNCTION IN TEST OPERATION .......................................	143
17.	TROUBLESHOOTING ............................................................................	165
18.	AIR SPEED CHARACTERISTICS..........................................................	170
19.	FAN CHARACTERISTICS......................................................................	175

CAUTION New Refrigerant Air Conditioner Installation

•THIS AIR CONDITIONER ADOPTS THE NEW HFC REFRIGERANT (R410A) WHICH DOES NOT DESTROY OZONE LAYER.

The characteristics of R410A refrigerant are ; easy to absorb water, oxidizing membrane or oil, and its pressure is approx. 1.6 times higher than that of refrigerant R22. Accompanied with the new refrigerant, refrigerating oil has also been changed. Therefore, during installation work, be sure that water, dust, former refrigerant, or refrigerating oil does not enter the refrigerating cycle.

To prevent charging an incorrect refrigerant and refrigerating oil, the sizes of connecting sections of charging port of the main unit and installation tools are charged from those for the conventional refrigerant.

Accordingly the exclusive tools are required for the new refrigerant (R410A).

For connecting pipes, use new and clean piping designed for R410A, and please care so that water or dust does not enter. Moreover, do not use the existing piping because there are problems with pressureresistance force and impurity in it.

1. SELECTING A LOCATION FOR INSTALLATION

WARNING

Install the air conditioner certainly at a location to sufficiently withstand the weight.

If the strength is insufficient, the unit may fall down resulting in human injury.

Perform a specified installation work to guard against a great wind such as typhoon or an earth quake.

An incomplete installation can cause accidents by the units failing and dropping.

The following models must be installed at height 2.5m or more from the floor. (Concealed type duct type and cassette type air conditioners)

If you insert your hands or others directly into the unit while the air conditioner operates, it is dangerous because you may contact with revolving fan or active electricity.

Installation Location Selection for Outdoor unit

Obtain permission from the customer to install the unit in a location that satisfies the following requirements :

•A location that permits level installation of the unit.

•A location that provides enough space to service the unit safety

•A location where water draining from the unit will not pose a problem

Avoid installing in the following places.

•Place exposed to air with high salt content (seaside area), or place exposed to large quantities of sulfide gas (hot spring). (Should the unit be used in these places, special protective measures are needed.)

•Place exposed to oil, vapor, oil smoke or corrosive gas.

•Place where organic solvent is used nearby.

•Place close to a machine generating high frequency.

•Place where the discharged air blows directly into the window of the neighboring house. (For outdoor unit)

•Place where noise of the outdoor unit is easily transmitted.

(When installing the air conditioner on the boundary with the neighbor, pay due attention to the level of noise.)

•Place with poor ventilation.

(Especially in Concealed duct type indoor unit, before air ducting work, check whether value of air volume, static pressure and duct resistance are correct.)

4

Equipments

1. Outdoor units

Corresponding HP

Inverter unit

Appearance

8 HP

10 HP

12 HP

Model name

MMY-

MAP0801FT8

MAP1001FT8

MAP1201FT8

Cooling capacity (kW)

22.4

28.0

33.5

Heating capacity (kW)

25.0

31.5

35.5

HP

Model name

No. of

Inverter 8HP

Used

Inverter 10HP

Used

Inverter 12HP

Used

(Capacity code)

MMY-

combined units

MMY-

Q’ty

MMY-

Q’ty

MMY-

Q’ty

8 HP ( 8)

MAP0801HT8

1

MAP0801FT8

1

10 HP (10)

MAP1001HT8

1

MAP1001FT8

1

12 HP (12)

MAP1201HT8

1

MAP1201FT8

1

Allocation atandard of model name

MMY– M

AP

F

T

8

Power supply specifications, 3Ø 380–415 V, 50Hz ....... 8

T : Capacity variable unit

F : Heat recovery

Development series No.

Capacity rank HP x 10

New refrigerant R410A

M : Single module unit, No mark : Combined Model name

Modular Multi

2. FS units (Flow selector units)

Model name	Inverter unit	Appearance
RBM-Y1121FE	Capacity rank for indoor unit : Type 007 to 030
RBM-Y1801FE	Capacity rank for indoor unit : Type 036 to 056

Accessory part : Connection cable kit (RBC-CBK15FE), up to 15m.

5

3. Indoor units

	Type	Appearance	Model name	Capacity rank	Capacity code	Cooling	Heating
						capacity (kW)	capacity (kW)
			MMU-AP0091H	009 type	1	2.8	3.2
			MMU-AP0121H	012 type	1.25	3.6	4.0
			MMU-AP0151H	015 type	1.7	4.5	5.0
			MMU-AP0181H	018 type	2	5.6	6.3
	4-way Air Discharge		MMU-AP0241H	024 type	2.5	7.1	8.0
	Cassette Type		MMU-AP0271H	027 type	3	8.0	9.0
			MMU-AP0301H	030 type	3.2	9.0	10.0
			MMU-AP0361H	036 type	4	11.2	12.5
			MMU-AP0481H	048 type	5	14.0	16.0
			MMU-AP0561H	056 type	6	16.0	18.0
			MMU-AP0071WH	007 type	0.8	2.2	2.5
			MMU-AP0091WH	009 type	1	2.8	3.2
			MMU-AP0121WH	012 type	1.25	3.6	4.0
	2-way Air Discharge		MMU-AP0151WH	015 type	1.7	4.5	5.0
			MMU-AP0181WH	018 type	2	5.6	6.3
	Cassette Type
			MMU-AP0241WH	024 type	2.5	7.1	8.0
			MMU-AP0271WH
				027 type	3	8.0	9.0
			MMU-AP0301WH	030 type	3.2	9.0	10.0
			MMU-AP0481WH*1)	048 type	5	14.0	16.0
			MMU-AP0071YH	007 type	0.8	2.2	2.5
			MMU-AP0091YH	009 type	1	2.8	3.2
			MMU-AP0121YH
	1-way Air Discharge			012 type	1.25	3.6	4.0
	Cassette Type		MMU-AP0151SH	015 type	1.7	4.5	5.0
			MMU-AP0181SH	018 type	2	5.6	6.3
			MMU-AP0241SH	024 type	2.5	7.1	8.0
			MMD-AP0071BH	007 type	0.8	2.2	2.5
			MMD-AP0091BH	009 type	1	2.8	3.2
			MMD-AP0121BH	012 type	1.25	3.6	4.0
			MMD-AP0151BH
				015 type	1.7	4.5	5.0
	Concealed Duct		MMD-AP0181BH	018 type	2	5.6	6.3
			MMD-AP0241BH
				024 type	2.5	7.1	8.0
	Standard Type
			MMD-AP0271BH	027 type	3	8.0	9.0
			MMD-AP0301BH	030 type	3.2	9.0	10.0
			MMD-AP0361BH
				036 type	4	11.2	12.5
			MMD-AP0481BH	048 type	5	14.0	16.0
			MMD-AP0561BH
				056 type	6	16.0	18.0
			MMD-AP0181H	018 type	2	5.6	6.3
	Concealed Duct		MMD-AP0241H	024 type	2.5	7.1	8.0
			MMD-AP0271H
	High Static			027 type	3	8.0	9.0
	Pressure Type		MMD-AP0361H	036 type	4	11.2	12.5
			MMD-AP0481H	048 type	5	14.0	16.0
			MMC-AP0151H	015 type	1.7	4.5	5.0
			MMC-AP0181H	018 type	2	5.6	6.3
			MMC-AP0241H
	Under Ceiling Type			024 type	2.5	7.1	8.0
			MMC-AP0271H	027 type	3	8.0	9.0
			MMC-AP0361H	036 type	4	11.2	12.5
			MMC-AP0481H	048 type	5	14.0	16.0
			MMK-AP0071H	007 type	0.8	2.2	2.5
			MMK-AP0091H
				009 type	1	2.8	3.2
	High Wall Type		MMK-AP0121H	012 type	1.25	3.6	4.0
			MMK-AP0151H	015 type	1.7	4.5	5.0
			MMK-AP0181H
				018 type	2	5.6	6.3
			MMK-AP0241H	024 type	2.5	7.1	8.0
			MML-AP0071H
				007 type	0.8	2.2	2.5
			MML-AP0091H
				009 type	1	2.8	3.2
	Floor Standing		MML-AP0121H	012 type	1.25	3.6	4.0
	Cabinet Type		MML-AP0151H	015 type	1.7	4.5	5.0
			MML-AP0181H	018 type	2	5.6	6.3
			MML-AP0241H
				024 type	2.5	7.1	8.0
			MML-AP0071BH	007 type	0.8	2.2	2.5
			MML-AP0091BH	009 type	1	2.8	3.2
	Floor Standing		MML-AP0121BH	012 type	1.25	3.6	4.0
	Concealed Type		MML-AP0151BH	015 type	1.7	4.5	5.0
			MML-AP0181BH
				018 type	2	5.6	6.3
			MML-AP0241BH	024 type	2.5	7.1	8.0
			MMF-AP0151H	015 type	1.7	4.5	5.0
			MMF-AP0181H	018 type	2	5.6	6.3
			MMF-AP0241H	024 type	2.5	7.1	8.0
	Floor Standing Type		MMF-AP0271H	027 type	3	8.0	9.0
			MMF-AP0361H	036 type	4	11.2	12.5
			MMF-AP0481H	048 type	5	14.0	16.0
			MMF-AP0561H	056 type	6	16.0	18.0
			*1) China only

6

Tools

Required Tools

The used refrigerating oil is changed, and mixing of oil may cause a trouble such as generation of sludge, clogging of capillary, etc. Accordingly, the tools to be used are classified into the following three types.

(1)Tools exclusive for R410A (Those which cannot be used for conventional refrigerant (R22))

(2)Tools exclusive for R410A, but can be also used for conventional refrigerant (R22)

(3)Tools commonly used for R410A and for conventional refrigerant (R22)

The table below shows the tools exclusive for R410A and their interchangeability.

Tools exclusive for R410A (The following tools for R410A are required.)

Tools whose specifications are changed for R410A and their interchangeability

				R410A		Conventional air
			air conditioner installation			conditioner installation
No.	Used tool	Usage
			Existence of		Whether conventional	Whether new equipment
			new equipment		equipment can be	can be used with
			for R410A		used	conventional refrigerant
•	Flare tool	Pipe flaring	Yes		*(Note 1)	¡
	Copper pipe gauge for	Flaring by conventional
‚	adjusting projection	flare tool	Yes		*(Note 1)	*(Note 1)
	margin
ƒ	Torque wrench	Connection of flare nut	Yes		×	×
„	Gauge manifold	Evacuating, refrigerant	Yes		×	×
		charge, run check, etc.
…	Charge hose
†	Vacuum pump adapter	Vacuum evacuating	Yes		×	¡
‡	Electronic balance for	Refrigerant charge	Yes		Yes	¡
	refrigerant charging
ˆ	Refrigerant cylinder	Refrigerant charge	Yes		×	×
‰	Leakage detector	Gas leakage check	Yes		×	¡
Š	Charging cylinder	Refrigerant charge	(Note 2)		×	×

(Note 1) When flaring is carried out for R410A using the conventional flare tools, adjustment of projection margin is necessary. For this adjustment, a copper pipe gauge, etc. are necessary.

(Note 2) Charging cylinder for R410A is being currently developed.

General tools (Conventional tools can be used.)

In addition to the above exclusive tools, the following equipments which serve also for R22 are necessary as the general tools.

	(1)	Vacuum pump	(4) Reamer		(9)	Hole core drill
		Use vacuum pump by	(5) Pipe bender		(10)	Hexagon wrench
		attaching vacuum pump adapter.	(6)	Level vial		(Opposite side 4mm)
	(2)	Torque wrench
			(7)	Screwdriver (+, –)	(11)	Tape measure
	(3)	Pipe cutter
			(8)	Spanner or Monkey wrench	(12)	Metal saw

Also prepare the following equipments for other installation method and run check.

(1)	Clamp meter	(3)	Insulation resistance tester
(2)	Thermometer	(4)	Electroscope

7

2. SAFETY NOTES

•Ensure that all Local, National and International regulations are satisfied.

•Read this “SAFETY NOTES” carefully before Installation.

•The precautions described below include the important items regarding safety. Observe them without fail.

•After the installation work, perform a trial operation to check for any problem.

Follow the Owner’s Manual to explain how to use and maintain the unit to the customer.

•Turn off the main power supply switch (or breaker) before the unit maintenance.

•Ask the customer to keep the Installation Manual together with the Owner’s Manual.

WARNING

•Ask an authorized dealer or qualified installation professional to install/maintain the air conditioner.

Inappropriate installation may result in water leakage, electric shock or fire.

•Turn off the main power supply switch or breaker before attempting any electrical work.

Make sure all power switches are off. Failure to do so may cause electric shock.

•Connect the connecting wire correctly.

If the connecting wire is connected in a wrong way, electric parts may be damaged.

•When moving the air conditioner for the installation into another place, be very careful not to enter any gaseous matter other than the specified refrigerant into the refrigeration cycle.

If air or any other gas is mixed in the refrigerant, the gas pressure in the refrigeration cycle becomes abnormally high and it as a result causes pipe burst and injuries on persons.

•Do not modify this unit by removing any of the safety guards or by by-passing any of the safety interlock switches.

•Exposure of unit to water or other moisture before installation may cause a short-circuit of electrical parts.

Do not store it in a wet basement or expose to rain or water.

•After unpacking the unit, examine it carefully if there are possible damage.

•Do not install in a place that might increase the vibration of the unit.

•To avoid personal injury (with sharp edges), be careful when handling parts.

•Perform installation work properly according to the Installation Manual.

Inappropriate installation may result in water leakage, electric shock or fire.

•When the air conditioner is installed in a small room, provide appropriate measures to ensure that the concentration of refrigerant leakage occur in the room does not exceed the critical level.

•Install the air conditioner securely in a location where the base can sustain the weight adequately.

•Perform the specified installation work to guard against an earthquake.

If the air conditioner is not installed appropriately, accidents may occur due to the falling unit.

•If refrigerant gas has leaked during the installation work, ventilate the room immediately.

If the leaked refrigerant gas comes in contact with fire, noxious gas may generate.

•After the installation work, confirm that refrigerant gas does not leak.

If refrigerant gas leaks into the room and flows near a fire source, such as a cooking range, noxious gas might generate.

•Electrical work must be performed by a qualified electrician in accordance with the Installation Manual. Make sure the air conditioner uses an exclusive power supply.

An insufficient power supply capacity or inappropriate installation may cause fire.

•Use the specified wires for wiring connect the terminals securely fix. To prevent external forces applied to the terminals from affecting the terminals.

•Conform to the regulations of the local electric company when wiring the power supply.

Inappropriate grounding may cause electric shock.

•Do not install the air conditioner in a location subject to a risk of exposure to a combustible gas.

If a combustible gas leaks, and stays around the unit, a fire may occur.

8

3. CHECK POINTS

Check before operation

•Turn on the main power switch 12 hours or more before starting the operation.

•Check whether earth wire is disconnected or out of place.

•Check that air filter is installed to the indoor unit.

Heating capacity

•For heating operation, a heat pump type which absorbs the outdoor heat and deliver the heat in the room is adopted. If the outdoor temperature lowers, the heating capacity decreases.

•When the outdoor temperature is low, common use with other heating devices is recommended.

Defrost operation in heating operation

•If frost is found on the outdoor unit during heating operation, the defrost operation starts automatically (for approx. 2 to 10 minutes) so as to increase the heating effect.

•During defrost operation, the fans of both indoor and outdoor units stop.

Protection for 3 minutes

•The outdoor unit does not operate for approx. 3 minutes after air conditioner has been immediately restarted after stop, or power switch has been turned on. This is to protect the system.

Main power failure

•If a power failure occurs during operation, all operations stop.

•When the power is turned on after power failure, the operation lamp of the remote controller flashes to notify.

•When restarting the operation, push ON/OFF button again.

Fan rotation of stopped unit

•While other indoor units operate, the fan on indoor units on “stand-by” rotates to protect the machine once per approx. 1 hour for several minutes.

Protective device (High pressure switch)

The high pressure switch operate the air conditioner automatically stops when excessive load is applied to the air conditioner. If the protective device works, the operation lamp keeps lit but the operation stops.

When the protective device works, “CHECK” characters in the remote controller display section flash. The protective device may work in the following cases.

Cooling

•When air inlet or outlet of the outdoor unit is closed.

•When strong wind blows continuously against air outlet of the outdoor unit.

Heating

•When much dust or dirt is excessively adhered to air filter of the indoor unit.

•When air outlet of the indoor unit is blocked.

NOTE

If the protective device works, turn off the main power switch, remove the cause, and then restart the operation.

Cooling/ heating operation of Multi system air conditioner

•When COOL or HEAT mode is fixed by the manager of the air conditioner, other operation than the set mode is

unavailable. If other operation than the set mode has been performed, [ PRE-HEAT] or [ Operation ready] on the operation part goes on and the operation stops.

Operating temperature of Super HRM

•When outdoor temperature goes out of specified range, “ or ” mark is indicated on the remote controller display and required operation will stop. “ & ” : When heating operation. “ ” : When cooling operation.

[Notice]

•This indication is not failure.

•When outdoor temperature goes back to specified range, “ or ” disappear and start normal operation.

•Operation stops because concurrent operation can not be kept in the condition of out of specification for Super HRM.

(Outdoor temp. (DB) < –5°C : Cooling, > 21°C : Heating)

•Do not use “Super HRM” for other than personal usage where the ambient temperature may go down below –5°C. (For example, OA equipment/Electric device/Food/Animals and plants/Art object)

Characteristics of heating operation

•Air does not blow out immediately after start of the operation. When the indoor heat exchanger has been heated after 3 to 5 minutes passed (differs according to temperature of indoor/outdoor temperature), hot air starts blowing.

•During operation, the outdoor unit may stop when outdoor temperature becomes high.

•When other indoor unit performs heating operation during fan operation, fan operation may be stopped temporarily to prevent discharge of hot air.

9

4. KEY POINTS OF AIR CONDITIONER INSTALLATION

In order to prevent problems before they arise, carefully read (1) the Installation Manual provided with the equipment, and (2) the Owner’s Manual before installing the air conditioner.

4-1. Flow of Air Conditioner Installation Work

	[Step]	[Key Points]
	(Prior to Installation)
	Determination of extent of installation work	Clearly determine the extent of the installation work.
		Draft :
	Drafting of diagrams	• Control wiring system diagram
		• Refrigerant line system diagram
		• Power wiring system diagram
	(Installation)
	Sleeve/insert installation	Pay careful attention to the downward slope of the drain pipe.
		Be sure to check the name of the model in order to avoid any
	Indoor unit and flow selector unit installation	installation mistakes. If the model has an installation pattern, attach
		the pattern to the ceiling to mark the position of the ceiling openings
		and to keep dust away.
		Make sure that the pipe system is dry, clean, and airtight.
	Refrigerant pipe installation	When brazing pipes, blow out the system with nitrogen gas.
		Do not forget the system indications.
	(to outdoor outlet)
	Drain pipe installation	Pipes should have downward slope (of at least 1/100).
	Duct installation	Make sure the duct is large enough to carry the desired volume of air.
		Be careful not to make any errors in the external static pressure
		calculations.
	Insulation work	Be especially careful to close off all gaps where connections are made
		to the indoor unit, and at joints in the branching kit. Do not forget the
		drain pipes.
	Electrical work	Use two-core shielded wires for the control wires, and use separate
		power supplies for the indoor and outdoor units. For connecting the
	(control wires and power wires)	flow selector unit, be sure to use the attached cable or connection
		cable kit sold separately.
	Various switch settings	Set the switches correctly, as indicated in the control wiring system
		diagram.
	Outdoor unit base installation	Make sure that the base is level.
	Outdoor unit installation	Provide for adequate air flow and service space around the outdoor
		unit. Indicate the system names clearly.
	Outside circulation, refrigerant pipe installation	From outside outlet to outdoor unit.
	Gas-leak test	In the final test, the system must be pressurized at 3.73MPa
		(38kg/cm²G) for 24 hours with no decrease in pressure.
	Vacuum suction	Use a vacuum pump with reverse flaw prevention adaptor with a large
		output volume and that can achieve a high level of vacuum.
	Addition of refrigerant	Record the amount of refrigerant that was added to the system on
		both the outdoor unit and on the pre-test operation checklist.
	Ceiling panel installation	Make sure that the ceiling panel is attached to the ceiling material
		tightly, with no gaps.
	Test operation and adjustment	Operate the indoor units one by one, making sure that all wiring and
		pipes are connected correctly, and fill out the checklist.
	Owner’s Manual transfer	Explain how to operate the system clearly and concisely.

The procedure described above presents only the general sequence of steps; the sequence of steps may have to be altered according to the circumstances of any specific installation job.

10

5. REFRIGERANT PIPE INSTALLATION

5-1. Work Procedure

Flaring

Indoor unit		Sizing		Preliminary
installation		the pipes		installation

Nitrogen gas blow

	Flushing		Leak test		Vacuum
					suction

Brazing

5-2. Three Principles of Refrigerant Pipes

<Observe the three principles of refrigerant pipes>

Causes of Problems

Preventing Problems

•

Moisture (in the form of

rainwater or water used during

Careful

Dry

installation, for example)

Vacuum

handling

Flushing

getting inside of the pipes

suction

of pipes

•

Moisture from condensation

forming or seeping into the pipes

•

Oxidation inside pipes during

Nitrogen gas blow

Clean

brazing

Flushing

•

Dirt, dust, or foreign matter

Careful handling of pipes

getting inside pipes

Use of suitable materials

Air-

•

Poor brazing

(copper pipes, solder, etc.)

Perform basic work

Leak test

tight

•

Poor flaring

of brazing carefully

Perform basic work

of flaring carefully

<Three principles of refrigerant pipes>

Dry	Clean	Airtight
Make sure there is no moisture	Make sure there is no dirt	Make sure the refrigerant
inside of the pipes	inside of the pipes	does not leak
Moisture	Dirt	Leak

Not good

Not good

Not good

11

5-3. Selecting the Refrigerant Line Material

•Refrigerant pipes

•Material: Phosphoric deoxidized seam-less pipe

•Capacity code of outdoor unit / indoor unit

•For each indoor unit, the capacity code is determined for every capacity rank.

•For each outdoor unit, the capacity code is determined for every capacity rank. The Max. number of the connectable indoor units and the total capacity code value of the indoor units are also determined.

	Against the capacity code of the outdoor unit, the total capacity codes of the connectable indoor units differ
	according to the height difference between indoor units.
	•	When the height difference between indoor units is 15m or less : Up to 135% of capacity code of outdoor unit
		*
		(* For 12HP system, up to 120%.)
	•	When the height difference between indoor units is 15m or more : Up to 105% of capacity code of outdoor unit

Table 1

Table 2

	Capacity code
Indoor unit
capacity rank	Equivalent to	Equivalent to
	HP	capacity
007 type	0.8	2.2
009 type	1	2.8
012 type	1.25	3.6
015 type	1.7	4.5
018 type	2	5.6
024 type	2.5	7.1
027 type	3	8
030 type	3.2	9
036 type	4	11.2
048 type	5	14
056 type	6	16

				Total capacity code of connectable indoor units
	Capacity code
Outdoor unit			No. of		Min		Max.
model name			indoor units
	Equivalent to	Equivalent to		Equivalent		Equivalent	Equivalent	Equivalent
	HP	capacity		to HP		to capacity	to HP	to capacity
MMY-MAP0801FT8	8	22.4	13	5.6		15.7	10.8	30.2
MMY-MAP1001FT8	10	28.0	16	7.0		19.6	13.5	37.8
MMY-MAP1201FT8	12	33.5	16	8.4		23.5	14.4	40.3

Table 3

No.	Piping parts	Name			Selection of pipe size				Remarks
•	Outdoor unit	Outdoor unit	1) Connecting pipe outdoor unit						Same to connecting
		main pipe							pipe size of outdoor unit
	↓			Model name	Suction gas side	Discharge gas side	Liquid side
	1st branching joint			MMY-MAP0801FT8	Ø22.2	Ø19.1	Ø12.7
				MMY-MAP1001 FT8	Ø22.2	Ø19.1	Ø12.7
				MMY-MAP1201 FT8	Ø28.6	Ø19.1	Ø12.7

‚ Branching section Branching pipe

2) Pipe size between branching sections

↓

Branching section

Total capacity codes of indoor units
at downstream side		Suction	Discharge	Liquid side
Equivalent to	Equivalent	gas side	gas side
capacity	to HP
Below 18.0	Below 6.4	Ø15.9	Ø12.7	Ø9.5
18.0 to below 34.0	6.4 to below 12.2	Ø22.2	Ø19.1	Ø12.7
34.0 to below 45.5	12.2 to below 16.2	Ø28.6	Ø22.2	Ø15.9

If exceeding the main pipe size, decide the size same to main pipe size.

When two pipes are used for the circuits exclusive to cooling, use pipes at liquid and suction gas sides.

Pipe size differs based on total capacity code value of indoor units at downstream side.

If the total value exceeds the capacity code of the outdoor unit, apply capacity code of the outdoor unit.

(See tables 1 and 2.)

12

No.

Piping parts

Name

Selection of pipe size

ƒ

End branching

Connecting pipe

3) Pipe size between end branching section and flow selector unit

section

of flow selector

unit

Total capacity codes of indoor units

Suction

Discharge

↓

at downstream side

Liquid side

gas side

gas side

Flow selector unit

Equivalent to capacity

Equivalent to HP

Below 4.5

Below 1.7

Ø12.7

Ø9.5

Ø6.4

4.5 to below 18.0

1.7 to below 6.4

Ø15.9

Ø12.7

Ø9.5

„

Branching section

Connecting pipe

4) Connecting pipe size of indoor unit

or flow selector

of indoor unit

unit

Capacity rank

Gas side

Liquid side

↓

007 to 012 type

Real length: Below 15m

Ø9.5

Real length: Over 15m

Ø12.7

Ø6.4

Indoor unit

015 to 018 type

Ø12.7

024 to 056 type

Ø15.9

Ø9.5

When pipe length between the end branching section and cooling-only indoor unit exceeds 15m, decide pipe size at gas side to the bigger one with Ø12.7.

… Branching section Branching header 5) Selection of branching joint/header
of Y-shape
branching joint		Total capacity codes of indoor units		Model name		RBM-
		Equivalent to	Equivalent to HP	For 3		For 2
		capacity		pipes piping		pipes piping
	Y-shape branching joint	Below 18.0	Below 6.4	BY53FE		BY53E
	1, 2	18.0 to below 40.0	6.4 to below 14.2	BY103FE		BY103E
	Branching header	Below 40.0	Below 14.2	HY1043FE		HY1043E
	1, 2, 3	Below 40.0	Below 14.2	HY1083FE		HY1083E

1 For branching pipe of the 1st branching section, select one by the outdoor unit capacity code.

2 When total capacity codes of indoor units exceed capacity code of outdoor unit, select one by capacity code of outdoor unit.

3 1 line after header branching is connectable up to total maximum capacity codes 6.0 (Equivalent to HP).

† Branching	Flow selector unit 6) Selection of flow selector unit
		Model name	Capacity rank of connectable indoor unit
		RBM-Y1121FE	007 to 030 type
		RBM-Y1801FE	036 to 056 type

Confirm also Installation Manual of flow selector unit.

			3 piping		2 piping
		(Liquld,discharge gas,suction gas)			(Liquld, gas pipe)
Outdoor unit		Outdoor unit to FS unit			FS unit to indoor unit
					Branching section indoor unit
1 Main piping	2		5 Header branching
1st branching			5 Y-shape branching joint
			2
section
	3	3	3
FS unit	6	6	6
2	4	4	4	4		4
		Indoor unit		< Cooling only >		< Cooling only >
	2	2	2
	3	3	3
FS unit	6	6	6
	4	4	4	4	4
		Indoor unit		< Cooling only >		< Cooling only >

13

5-4. Allowable Length/Height Difference of Refrigerant Piping

Outdoor unit

• System restrictions

Max. capacity of

H2 ≤

15m

135%

Main

combined indoor unit

H2 > 15m

105%

piping L1

For 12HP system, up to 120%

Branching

Branching piping L2

header

Connecting piping of indoor unit

L7

1st branching

section

a

b

c

Height difference between outdoor

and indoor units

L3

H1 50m

FS unit

g

h

i

j

k

Indoor unit

< Cooling only > < Cooling only >

Equivalent length corresponded to farthest piping L 125m

Equivalent length corresponded to farthest piping after 1st branching Li

50m

Height difference between

L4

L5

L6

indoor units

p

H2

35m

d

e

f

o

FS unit

l

m

n

< Cooling only >

< Cooling only >

• Allowable length and height difference of refrigerant piping

			Allowable value	Piping section
	Total extension of pipe (Liquid pipe, real length)		250 m	L1 + L2 + L3 + L4+ L5 + L6 + L7 + a + b + c +
				d + e + f + g + h + i + j + k + l + m + n + o + p
	Farthest piping length L (*1)	Real length	100 m	L1 + L3 + L4 + L5 + L6 + p
Pipe		Equivalent length	125 m
Length	Max. equivalent length of main piping		85 m	L1
	Equivalent length of farthest piping from 1st branching Li (*1)		50 m	L3 + L4 + L5 + L6 + p
	Max. real length of indoor unit connecting piping		30 m	a + g, b + h, c + l, d + l, e + m, f + n, j, k, o, p
	Max. real length between FS unit and indoor unit (*2)		15 m	g, h, i, l, m, n
	Height between indoor	Upper outdoor unit	50 m	——
Height	and outdoor units H1	Lower outdoor unit	30 m	——
difference	Height between indoor units H2	Upper outdoor unit	35 m	——
		Lower outdoor unit	15 m	——

*1 The farthest indoor unit from the 1st Branch to be named as (p).

*2 Attached connection cable can be used up to 5 m in pipe length between indoor and FS unit. When the pipe length between indoor and FS unit exceeds 5 m, be sure to use the connection cable kit (RBC-CBK15FE). (Sold separately)

FS unit

FS unit

Indoor unit				Indoor unit

[NOTE] :

Don’t connect two or more indoor units to one FS unit. Arrange one indoor unit and one FS unit set to 1 by 1.

14

•Brazed couplings and special branches

•Use suitable parts for typical elbow couplings and socket couplings.

(Consider the size, material, thickness, etc.)

• Special branches

Use deoxidized parts sold separately.

Branching at indoor unit side

Branch header

Branching joint	4 branching	8 branching
RBM-BY53E	RBM-HY1043E	RBM-HY1083E
RBM-BY103E	RBM-HY1043FE	RBM-HY1083FE
RBM-BY53FE
RBM-BY103FE

• Solder

Because only “copper-to-copper” connections are made in the multi type air conditioning system, use the hard solder “phosphor copper solder.”

15

5-5. Careful Handling

Careful handling is the most important step in preventing moisture, dirt, and dust from getting inside of the pipes. Moisture in pipes has caused major problems in numerous instances in the past. Therefore, it is important to be as careful as possible in order to prevent problems before they occur.

Pipe delivery and storage

When pipes are delivered, care should be taken to prevent it from becoming bent or deformed, and the ends of the pipes should be capped in order to prevent dirt, mud, rain, etc., from getting inside. Build a wooden frame to hold the pipes securely, and store the pipes in the specified location.

Delivery of copper pipes without caps to a work site is not acceptable.

			Cap
	Frame for careful handling	Careful handling on a pallet	Pipe caps
	and to prevent rolling

The ends of all pipes must be sealed. The most reliable method is the “pinch method,” but the taping method can be selected in some circumstances.

Location	Time for installation	Careful handling method
Outdoors	One month or more	Pinch method
	Less than one month	Pinch or taping method
Indoors	Does not matter	Pinch or taping method

n Pinch method

Pinch the end of the copper pipe closed, and braze any opening closed.

n Taping method

Cover the end of the copper pipe with vinyl tape.

Copper pipe

Solder

Braze here

[Taping method]

Opening

Vinyl tape

Flatten

Fold over

Tape again

Copper pipe

16

CAUTIONS

		GOOD	NOT GOOD
1) Do not allow dirt or moisture
inside of the pipes.			Dirt and moisture get inside
•	Keep the open ends of all pipes
	capped until all pipes have been	Cap
	connected.
•	Pipe openings should face
	horizontally or downwards if at all		Pipe
	possible.

	2) When passing a pipe through an	Wall	Cap or	Wall
	opening in a wall, always keep		plastic bag
	the end of the pipe capped.
			Rubber band	Particles of
				the wall get
				inside the pipe

3) Do not place pipes directly on	Rubber		Cap or
	band
the ground. Do not scrape pipes			plastic bag	Dirt gets inside of pipe
			Do not allow
on the ground.
			pipe to touch
			ground
	Ground			Ground
4) When deflashing (removing		Pipe
burrs from) a pipe, point the			Burrs
opening downwards so that no			Deflasher
scraps fall inside of the pipe.
				Scraps get inside of pipe
5) When installing pipes on a rainy			Cap or
			plastic bag
day, always keep the ends of the				Rain gets
pipes capped.			Rubber	inside of pipe
			band
	Rain			Rain

17

5-6. Parts of Branching Header/Joint

Branching Header : RBM-HY1043E / HY1083E

Branching Joint : RBM-BY53E / BY103E

•Check the following parts in the package.

•For piping material and size of the refrigerant pipes, refer to the Installation Manual of the Air Conditioner.

NOTE : 1.	All dimensions are in millimeters. In the following tables, ( ) indicates diameter of the indicated position, and
	others indicate diameter of the connecting pipe.
2.	Please connect pipe to the side with a projection of the socket.	projection
	( 51 , 52 , 54 , 58 , 59 , 61 , 62 , 70 , 89 : without projection)	Diameter of the
		connecting pipe
		socket

Branching Header

NAME	MODEL	RBM-HY1043E			RBM-HY1083E
Branching header		Ø15.9			Ø15.9
gas side		Ø22.2			Ø22.2
				1pc			1pc
Branching header		Ø9.5			Ø9.5
liquid side		Ø15.9			Ø15.9
				1pc			1pc

Heat insulator

(gas side/liquid side)

1pc each

1pc each

No.

No.

No.

No.

Liquid Gas

side side

14

Ø15.9 x (Ø22.2) 1pc

06

Ø 9.5 x (Ø15.9) 4pcs

14

Ø15.9 x (Ø22.2) 1pc

06

Ø 9.5 x (Ø15.9) 8pcs

Socket

diameter of the

18

Ø19.1 x (Ø22.2) 1pc

09

Ø12.7 x (Ø15.9) 4pcs

18

Ø19.1 x (Ø22.2) 1pc

09

Ø12.7 x (Ø15.9) 8pcs

connected pipe

70

Ø28.6 x (Ø22.2) 1pc

70

Ø28.6 x (Ø22.2) 1pc

)

(

06

Ø 9.5 x (Ø15.9) 1pc

01

Ø 6.4 x (Ø 9.5) 4pcs

06

Ø 9.5 x (Ø15.9) 1ps

01

Ø 6.4 x (Ø 9.5) 8pcs

external diameter

09

Ø12.7 x (Ø15.9) 1pc

09

Ø12.7 x (Ø15.9) 1ps

of socket

Outlet sealed pipe at gas side	(Ø15.9) 1pc	(Ø15.9)	3pcs
Header sealed pipe at liquid side	(Ø15.9) 1pc	(Ø15.9)	1pc

Outlet sealed pipe at liquid side

(Ø 9.5) 1pc

(Ø 9.5) 3pcs

NAME

MODEL

RBM-BY53E

RBM-BY103E

Ø12.7

Ø19.1

Branching joint

Ø15.9

Ø22.2

gas side

Ø12.7

Ø19.1

1pc

1pc

Joint

Branching joint

Ø12.7

Ø9.5

Ø15.9

Ø12.7

Ø9.5

Ø12.7

liquid side

1pc

1pc

Branching

Heat insulator

(gas side/liquid side)

1pc each

1pc each

No.

No.

No.

No.

side

diameter of the

09

Ø12.7 x (Ø15.9) 1pc

05

Ø 9.5 x (Ø12.7) 2pcs

18

Ø19.1 x (Ø22.2) 1pc

07

Ø 9.5 x (Ø19.1) 1pc

51

Ø19.1 x (Ø15.9) 1pc

54

Ø15.9 x (Ø12.7) 2pcs

70

Ø28.6 x (Ø22.2) 1pc

10

Ø12.7 x (Ø19.1) 1pc

connected pipe

13

Ø15.9 x (Ø19.1) 2pcs

Gas

Socket

( )

52

Ø22.2 x (Ø19.1) 2pcs

89

Ø28.6 x (Ø19.1) 1pc

side

external diameter

05

Ø 9.5 x (Ø12.7) 1pc

01

Ø 6.4 x (Ø

9.5) 2pcs

06

Ø 9.5 x (Ø15.9) 1pc

02

Ø 6.4 x (Ø12.7) 1pc

of socket

09

Ø12.7 x (Ø15.9) 1pc

05

Ø 9.5 x (Ø12.7) 2pcs

Liquid

54

Ø15.9 x (Ø12.7) 1pc

18

Branching Header : RBM-HY1043FE / HY1083FE

Branching Joint : RBM-BY53FE / BY103FE

•Check the following parts in the package.

•For piping material and size of the refrigerant pipes, refer to the Installation Manual of the Air Conditioner.

NOTE : 1.	All dimensions are in millimeters. In the following tables, ( ) indicates diameter of the indicated position, and
	others indicate diameter of the connecting pipe.	projection
2.	Please connect pipe to the side with a projection of the socket.	Diameter of the
	( 52 , 54 , 70 , 89 : without projection)	connecting pipe
		socket

Branching Header

NAME

MODEL

RBM-HY1043FE

RBM-HY1083FE

Suction gas side

Ø22.2

Ø15.9

Ø22.2

Ø15.9

1pc

1pc

Discharge gas side

Ø22.2

Ø15.9

Ø22.2

Ø15.9

1pc

1pc

Liquid side

Ø9.5

Ø9.5

Ø15.9

Ø15.9

Ø15.9

Ø15.9

Heat insulator

1pc

1pc

(suction gas side/

discharge gas side/liquid side)

1pc each

1pc each

Socket

No.

No.

No.

No.

Suction

diameter of the

14

Ø15.9 x (Ø22.2) 1pc

06

Ø 9.5 x (Ø15.9) 3pcs

14

Ø15.9 x (Ø22.2) 1pc

06

Ø

9.5 x (Ø15.9) 7pcs

gas side

connected pipe

70

Ø28.6 x (Ø22.2) 1pc

09 Ø12.7 x (Ø15.9) 4pcs

70

Ø28.6 x (Ø22.2) 1pc

09 Ø12.7 x (Ø15.9) 8pcs

Discharge

)

85

Ø12.7 x (Ø22.2) 1pc

06

Ø 9.5 x (Ø15.9) 4pcs

85

Ø12.7 x (Ø22.2) 1pc

06

Ø

9.5 x (Ø15.9) 8pcs

gas side

(

18

Ø19.1 x (Ø22.2) 1pc

09 Ø12.7 x (Ø15.9) 4pcs

18

Ø19.1 x (Ø22.2) 1pc

09 Ø12.7 x (Ø15.9) 8pcs

external

Ø 9.5 x (Ø15.9) 1pc

Ø 6.4 x (Ø 9.5) 4pcs

Ø 9.5 x (Ø15.9) 1pc

Ø

6.4 x (Ø 9.5) 8pcs

Liquid

06

01

06

01

diameter

side

of socket

09

Ø12.7 x (Ø15.9) 1pc

09

Ø12.7 x (Ø15.9) 1pc

Outlet sealed pipe at suction gas side

(Ø15.9) 1pc

(Ø15.9) 3pcs

Outlet sealed pipe at discharge gas side

(Ø15.9) 3pcs

(Ø15.9) 7pcs

Outlet sealed pipe at liquid side

(Ø 9.5) 1pc

(Ø 9.5) 3pcs

Header sealed pipe at liquid side

(Ø15.9) 1pc

(Ø15.9) 1pc

	NAME	MODEL		RBM-BY53FE				RBM-BY103FE
				Ø15.9		Ø12.7		Ø22.2		Ø19.1
	Suction gas side					Ø12.7				Ø19.1
						1pc				1pc
	Discharge gas side			Ø15.9		Ø12.7		Ø22.2		Ø19.1
						Ø12.7				Ø19.1
						1pc				1pc
				Ø12.7		Ø9.5		Ø15.9		Ø12.7
Joint	Liquid side					Ø9.5				Ø12.7
						1pc				1pc
	Heat insulator
	(suction gas side/
Branching
	discharge gas side/liquid side)					1pc each				1pc each
		Socket	No.		No.		No.		No.
					05	Ø 9.5 x (Ø12.7) 2pcs	70	Ø28.6 x (Ø22.2) 1pc	07	Ø 9.5 x (Ø19.1) 1pc
	Suction	diameter of the			54	Ø15.9 x (Ø12.7) 2pcs			10	Ø12.7 x (Ø19.1) 1pc
									13	Ø15.9 x (Ø19.1) 2pcs
	gas side
		connected pipe							52	Ø22.2 x (Ø19.1) 2pcs
									89	Ø28.6 x (Ø19.1) 1pc
		)	09	Ø12.7 x (Ø15.9) 1pc	05	Ø 9.5 x (Ø12.7) 2pcs	18	Ø19.1 x (Ø22.2) 1pc	10	Ø12.7 x (Ø19.1) 2pcs
	Discharge	(
					54	Ø15.9 x (Ø12.7) 1pc			52	Ø22.2 x (Ø19.1) 1pc
	gas side
		external				Sealed pipe x (Ø19.1) 1pc				Sealed pipe x (Ø19.1) 1pc
		diameter	05	Ø 9.5 x (Ø12.7) 1pc	01	Ø 6.4 x (Ø 9.5) 2pcs	09	Ø12.7 x (Ø15.9) 1pc	02	Ø 6.4 x (Ø12.7) 1pc
	Liquid	of socket
									05	Ø 9.5 x (Ø12.7) 2pcs
	side								54	Ø15.9 x (Ø12.7) 1pc
						19

5-7. Branching Kit Connection Method

[1] Branch joint

<Suction gas/Discharge gas side>

		Socket	Pipe in use on the site
Pipe in use	Socket Outlet (2)		To other branching
on the site			pipe or indoor unit
Inlet		Outlet (1)
To outdoor unit		Socket
Gas side branch joint
<Liquid side>
		Socket	To other branch-
			ing pipe or indoor
	Outlet (1)		unit
			Pipe in use
			on the site
Pipe in use		Outlet (2)	Socket
on the site
Inlet	Socket	Gas/Liquid side branch joint
To outdoor unit

•Installation direction of branch pipe

Install the branching pipes so that it branch either vertically or horizontally.

Both directions are possible.

In case of vertical installation

<Suction gas/Discharge gas/Liquid side>

A

B

	(Horizontal line)	Within
		± 15 degrees
		(A view)
	(Horizontal line)	Within
		± 15 degrees
		(B view)

<In case of horizontal installation>

NOTE :

•Install the branch pipes horizontally or vertically so that they are branched evenly.

•Install the branching joint within ±15 degrees.

NOTE :

Install the branch pipes horizontally or vertically so that they branch evenly.

Install the branching joint within ± 15 degrees.

Heat insulating for pipes (Branching Joint)

•In order to prevent dripping at the place where the insulation provided with the branching kit meets the insulating material obtained on the site, butt the two types of insulation up against each other, and then wrap the seam between the two types of insulation in at least 10mm of the insulating material (in use on the site).

<Suction gas/Discharge gas/Liquid side>

Butt together

Butt together

Heat insulator

Heat insulator Heat insulator for piping

for piping

(in use on the site)

in package

(in use on the site)

150

Branching joint

Butt together

Heat insulator (in use on the site) by 10mm or more thickness.

•On the gas-side pipe, use insulation that can withstand heat of 120°C or higher. For the branch pipe, either use a commercially available coupling cover (for T-shape) that is at least 10mm thick, or else insulate the pipe as shown in the figure at below.

•After applying insulation as outlined above, tape the insulation in place.

Taping (in use on the site)

Heat insulator

Heat insulator (in use on the site)

(in use on the site)

20

[2] Branch header

Branching Header

Select and install the socket that matches the diameter of a pipe to be connected to the indoor unit.

<Suction gas/Discharge gas side branch header>

		Socket
Pipe in use on the site		Pipe in use on the site
		To indoor unit
To outdoor unit	Socket
<Liquid-side branch header>
		Socket
Pipe in use on the site		Pipe in use
		on the site
		To indoor unit
To outdoor unit		Socket

•If the number of indoor units to be connected is fewer than the maximum number of units that can be connected to the branch header, attach a sealed pipe to the unused connectors.

<Suction gas/Discharge gas side branch header>

Outlet sealed pipe (Provided with branch header)

B

A

<Liquid-side branch header>

Outlet sealed pipe (Provided with branch header)

CD

•Install the branch header so that it branches horizontally. It cannot be used in a vertical position.

CAUTION

<Suction gas/Discharge gas side>

	(Horizontal line)		Within
		(A view)	± 15 degrees
	(Horizontal line)		Within
		(B view)	± 10 degrees

<Liquid-side>

(Horizontal line)

Within

± 15 degrees

(C view)

When arranging the branching header at the liquid side, attach a header sealed pipe on the sealing side of the header as shown in the fiqure at below.

Be sure to install the branch pipe downward.

Horizontal viewed from D point should be within ± 10

degrees same as view B.

•Supporting branching header

After applying the insulation, set the hanging metals as support. (in use on the site).

NOTE :

1.Install the branching header so that it branches horizontally. It cannot be used in a vertical position.

2.Do not use T-type pipe for the branching section.

Inlet socket Branching Header Header sealed pipe

Within

± 10 degrees

	Pipe in use		(D view) Sealing side
	on the site

1.On the inlet side of a Y-type branch joint or branch header, allow for at least 300mm of straight pipe.

2.A Y-type branch joint can be installed so that it branches either vertically or horizontally; if branching horizontally, it should be within an angle of ± 15°.

3.A branch header should be installed so that it branches horizontally.

4.Do not use T-type branch joints.

CAUTION

In the multi air conditioning system, because the refrigerant pipes congregate at the rooftop pipeshaft outlet in the vertical pipeshaft, it is necessary to attach “labels” to each pipe in order to make clear to which system a given pipe belongs so as to prevent pipes from being connected incorrectly.

21

How to connect “Cooling Only” indoor unit

Branch joint

•When connecting a Cooling Only indoor unit, attach a sealed pipe to the unused connectors of the branching pipe of discharge gas side.

	Suction gas side	Connect sealed pipe.	Indoor unit
			Cooling only
	* Discharge gas side
	Liquid side
		Flow selector unit	Indoor unit
			Heating and Cooling

Refer to above. There is the method of connecting without using branching joint pipe of discharge gas side. For details, refer to the Installation Manual of the Air Conditioner.

Branch header

•When connecting a Cooling Only indoor unit, attach a sealed pipe to the unused connectors of the branching pipe of discharge gas side.

Suction gas side

	Connect sealed pipe.	Indoor unit
		Cooling only

Discharge gas side

Liquid side

Flow selector unit	Indoor unit
	Heating and Cooling

[NOTE]

For cooling only indoor unit in Super-HRM system, item code (DN) setting from the wired remote controller is necessary. (Refer to the section “13-1.”)

22

5-8. External Dimensions of Branch Connectors

(Outline drawings are shown on the following pages.)

Branching joints and headers

	Model name	Usage	Appearance
	RBM-BY53FE	Indoor unit capacity code
		Total below 6.4
			For 3 piping
		Indoor unit capacity code
	RBM-BY103FE
		Total below 14.2
	Y-shape branching joint (*2)
		Indoor unit capacity code
	RBM-BY53E
		Total below 6.4
			For 2 piping (*4)
	RBM-BY103E	Indoor unit capacity code
		Total below 14.2
	RBM-HY1043FE	Indoor unit capacity code	For 3 piping
	4-branching header (*3)	Total below 14.2
		Indoor unit capacity code	For 2 piping (*4)
	RBM-HY1043E
		Total below 14.2
	RBM-HY1083FE	Indoor unit capacity code	For 3 piping
	8-branching header (*3)	Total below 14.2
		Indoor unit capacity code	For 2 piping (*4)
	RBM-HY1083E
		Total below 14.2

*1 If total capacity code value of indoor unit exceeds that of outdoor unit, apply capacity code of outdoor unit. *2 When using Y-shape branching joint for 1st branching, select according to capacity code of outdoor unit. *3 Max. 6.0 capacity code in total can be connected.

*4 This is used for branching to “cooling only” indoor unit.

*5 Model names for outdoor and indoor units described in this guide are shortened because of the space constraint.

5-9. Nitrogen Gas Blow Method (During Brazing)

•If nitrogen gas is not passed through the pipes during brazing, a film of oxidized material will form on the inner surfaces of the pipes. The presence of a such a film in the system will adversely affect the operation of the valves and compressor in the refrigerant system, and will prevent the system from operating normally.

•In order to prevent this from occurring, nitrogen gas is passed through the pipes while brazing is in progress. This process of replacing the air in the pipes with nitrogen is called the “nitrogen gas blow.”

This is the basic method that is used for brazing work.

CAUTION

1.Nitrogen gas must be used. (Oxygen, carbon dioxide, and fluorocarbons cannot be used.)

2.Always be sure to use a pressure-reducing valve.

				Outside	Valve
Piping at site		Reducing valve
		Copper pipe Ø6.4			Hose
				Piping
					Reducing
					valve
		Valve
Brazing	Taping
position		Pressure			Nitrogen
		tight hose	Nitrogen
					gas bomb

gas bomb

23

5-10. Brazing Work

1.	Brazing work should be performed downwards or	(Recommended brazing)
	sideways. Avoid brazing upwards (in order to
	avoid incomplete brazing). (Recommendation)
2.	Always used the specified piping materials for	Brazing material
	liquid pipes and gas pipes, and make sure that
	they are installed in the proper direction and at
	the proper angle.
3.	The “nitrogen gas blow” method should be used	Lateral direction
	when brazing.	Brazing	Brazing
		material
			material
		(Direction downward)	(Direction upward)

CAUTIONS

1.Pay attention to fire prevention concerns. (Take preventative measures in the area where brazing work is to be performed, such as keeping a fire extinguisher or water handy.)

2.Be careful not to burn yourself.

3.Make sure that any gaps between pipes and couplings are appropriate. (Do not miss brazing any joints.)

4.Make sure that pipes are adequately supported.

•The following table provides basic guidelines for the interval between supports for horizontal copper pipe.

Coupling size of brazed pipe

Connected section

External size	Internal size
K	G
ØC	ØF

Interval between supports for copper pipe

Nominal dia.	20 or less	25 to 40
Max. interval (m)	1.0	1.5

•Avoid securing copper pipes with metal brackets directly.

								(Unit: mm)
			Connected section
Standard outer dia. of	External size	Internal size		Min. depth				Min. thickness
connected copper pipe	Standard outer dia. (Allowable difference)			of insertion			Oval value	of coupling
	C		F	K		G
6.35	6.35 (±0.03)	6.45	( +0.04–0.02 )	7		6	0.06 or less	0.50
9.52	9.52 (±0.03)	9.62	( +0.04–0.02 )	8		7	0.08 or less	0.60
12.70	12.70 (±0.03)	12.81	( +0.04–0.02 )	9		8	0.10 or less	0.70
15.88	15.88 (±0.03)	16.00	( +0.04–0.02 )	9		8	0.13 or less	0.80
19.05	19.05 (±0.03)	19.19	( +0.03–0.03 )	11		10	0.15 or less	0.80
22.22	22.22 (±0.03)	22.36	( +0.03–0.03 )	11		10	0.16 or less	0.82
28.58	28.58 (±0.04)	28.75	( +0.06–0.02 )	13		12	0.20 or less	1.00

Gas brazing of refrigerant pipes must be performed by personnel qualified to do so under local ordinances.

Minmum wall thickness for R410A application

Soft (Coil)	Hard or Half hard	OD (Inch)	OD (mm)	Minium wall thickness
¡	¡	1/4	6.35	0.80
¡	¡	3/8	9.52	0.80
¡	¡	1/2	12.70	0.80
¡	¡	5/8	15.88	1.00
NG	¡	3/4	19.05	1.00
NG	¡	7/8	22.20	1.00
NG	¡	1.1/8	28.58	1.00

24

5-11. Flare Processing

Flare processing procedure

Parts and material	: Copper pipe, flare nut. Flare nut shallbe of attached on the indoor unit or R410A exclusive.
Tools	: Flare tool (“Rigid” type), reamer, pipe cutter
Work procedure		Key point	(Reason)
Straighten the coiled copper pipe.		Uncoil the pipe.	• It is difficult to cut the coiled pipe
			correctly, which increases the
			chance of failure.

Cut the pipe with the pipe cutter.	1.	Position the blade of the cutter	•	The cut surface will be at an
		so that it will cut the pipe at a		angle.
		perpendicular angle.
	2.	Rotate the pipe cutter to the	•	The cutter will bite too tightly.
		left to cut the pipe.
	3.	Move the pipe cutter slowly.	•	The copper pipe will be
				deformed.
Use the reamer to remove burrs	1 . Keep the opening of the pipe		• Scraps will get inside of the
from the cut surface of the pipe.		facing downwards.		pipe.
Pipe	2.	Be careful not to scratch the	•	A gas leak could result.
		inner surface of the pipe.
Burr
Deburring

Clear out the inside of the pipe by	Make sure that all scraps of metal	•	Metal scraps in the tube can
tapping on the end with a	are out of the tube by lightly		damage the compressor.
screwdriver.	tapping on the tube while the	•	If the scraps adhere to the
	opening is pointing down.		flared region, a gas leak may
			result.

Insert the flare nut.	Be certain to insert the flare nut
	before beginning the flare
	process.

•The flare nut will not fit inside the copper pipe after the flare process.

25

Work procedure

Key point

(Reason)

Attach the (“Rigid”)

1. Make sure that the

•

The copper pipe will slip out while the flaring process is in

flare tool to the

inner surfaces of the

progress.

copper pipe.

flare tool are clean.

•

The flared dimensions vary.

2. Determine the

Dimensions to end of copper tube when flared with one tool

dimensions of the

surface

copper pipe in

accordance with the

• Projection margin in flaring : A (Unit : mm)

flare tool.

Rigid (Clutch type)

45˚

Outer dia. of

R410A tool used

Conventional tool used

copper pipe

R410A

R22

R410A

R22

A

6.4

0 to 0.5

(Same as left)

1.0 to 1.5

0.5 to 1.0

Flare tool

9.5

0 to 0.5

(Same as left)

1.0 to 1.5

0.5 to 1.0

12.7

0 to 0.5

(Same as left)

1.0 to 1.5

0.5 to 1.0

Copper pipe

15.9

0 to 0.5

(Same as left)

1.0 to 1.5

0.5 to 1.0

Align the punch.

Imperial (Wing nut type)

Align the arrow on the

Outer dia. of copper pipe

R410A

R22

(Align the arrow with

punch with the

6.4

1.5 to 2.0

1.0 to 1.5

the line adjacent to

prescribed position on

9.5

1.5 to 2.0

1.0 to 1.5

the next hole.)

the flare tool.

12.7

2.0 to 2.5

1.5 to 2.0

15.9

2.0 to 2.5

1.5 to 2.0

•If the “A” dimension is small, the flared contact surface is smaller and a gas leak becomes more likely.

Flare the pipe.	Slowly and carefully turn	• The pipe will not be flared fully.
	the flare tool handle	• The extended portion of the pipe (the cone-shaped portion)
	while it clicks, until it	will be scratched.
	turns freely. Turn the
	handle to the left and
	raise it to the top.	• Extruding margin of copper pipe
		with flare machining : A (Unit: mm)
		Copper pipe outer dia.	+0.0	A
			A –0.4
		9.5	13.2
		12.7	16.6
		15.9	19.7

	Remove the flare tool	If the handle is not raised to the
		top, the flare tool will scratch the
	and check the flared
		extended portion of the pipe
	surface.
		(the cone-shaped portion).

Check list :

•Is the inner surface of the flared portion equal in width and shiny?

•Is the thickness of the flared portion equal?

•Is the flared portion of a suitable size?

26

5-12. Flushing

The flushing process uses gas pressure to remove foreign matter from the inside of pipes.

Three major effects

(1)Removes oxidation that formed inside of the pipe during brazing as a result of an inadequate “nitrogen gas blow” procedure.

(2)Removes foreign matter and moisture that has gotten inside of pipes due to improper handling.

(3)Checks the connections in the pipe system between the indoor unit and the outdoor unit.

[Example work procedure]

1.Install a pressure reducing valve on a nitrogen cylinder. (Fluorocarbon gases and carbon dioxide carry a risk of promoting condensation, while oxygen causes explosion.)

2.Connect the pressure reducing valve to a gauge manifold and then to the gas-side pipe and the liquid-side pipe on the outdoor unit.

Indoor unit

			Ø6.4 copper pipe		Source valve
					Gauge
N	2	1	Diff. size union
				VL VH	manifold
					valve
					Reducing
					valve
					Nitrogen gas bomb
3. On the indoor unit side, plug all gas-side pipes except those for the					Plug (Brass)
indoor units that are to be flushed.					Flare nut
					Copper pipe

4.Open the source valve on the nitrogen cylinder and increase the pressure on the secondary side of the pressure reducing valve until it reaches 0.5MPa (5kg/cm2G), and then open the valve on the gauge manifold connected to the gas-side pipe.

5.Flushing

Press down on the end of the indoor-side gas pipe with your palm.

When the pressure becomes so great that you can no longer hold it against the end of the pipe, remove your hand from the pipe. (This is the first flush.) Press down against the end with your hand again.

Flush the pipe a second time.

(When flushing, place a piece of gauze, etc., on the end of the pipe, and then check the gauze for debris or moisture. Repeat the flushing process until nothing more comes out of the pipe.)

6.Close the gauge manifold valve, and repeat the above process for next indoor unit (No. 2 to No. N). Close the gauge manifold valve, open the valve on the gauge manifold that is connected to the liquidside pipe to allow the nitrogen to flow, and flush that liquid-side pipe.

Source	1st side
valve

2nd side 0.5MPa (5kg/cm²G)

Nitrogen	Reducing valve
gas

Pressure

0.5MPa (5kg/cm²G)

Hand

27

5-13. Pipe Connections to the Indoor Unit

1.Once you remove the flare nut from the pipe on the indoor unit (always use a torque wrench), a small amount of gas will escape, but this is simply nitrogen gas with atmospheric pressure that was sealed inside to prevent corrosion, and does not indicate a problem.

2.Flare the pipe according to the procedure described previously.

Tapered portion
<Indoor unit>		<Pipe>
Center
Brazing union	Flared portion	Flare nut
(half union)

3.Centering

Center the pipes be seating the tapered portion of the half union in the flared portion of the pipe.

4.Tightening the flare nut

First hand-tighten the flare nut as much as possible, and then use a torque wrench to tighten the nut completely.

Connecting pipe outer dia.	Tightening torque
(mm)	(N•m)
Ø6.4	14 to 18 (1.4 to 1.8 kgf•m)
Ø9.5	34 to 42 (3.4 to 4.2 kgf•m)	Tightening the flare nut with a torque wrench
Ø12.7	50 to 62 (5.0 to 6.2 kgf•m)
Ø15.9	68 to 82 (6.8 to 8.2 kgf•m)

: R410A torque wrench required.

<Two spanners>

Turn flare nut with a wrench

<Indoor unit>

<Pipe>

Secure half union in place with a wrench

*Avoid initially tightening the nut with a wrench.

*When tightening a 6.4mm-diameter pipe, tighten the nut lightly with a wrench, and then tighten the nut about 90° to 120° (1.5 to 2 corners of the nut) with a torque wrench.

28

5-14. Pipe Connection to the Outdoor Unit

WARNING

If the refrigerant gas leaks during installation work, ventilate the room.

If the leaked refrigerant gas comes to contact with a fire, the noxious gas may generate.

After installation work, check that the refrigerant gas does not leak.

If the refrigerant gas leaks in the room and comes to contact with a fire such as fan heater, stove, or kitchen range, the noxious gas may generate.

Connection of refrigerant pipe

1.The refrigerant pipe connecting section is set in the outdoor unit. Remove the front panel and the piping/wiring panel. (M5: 9 pcs.)

•As shown in the right figure, the hooking hooks are attached at right and left sides each on the front panel. Lift up and remove the front panel.

2.Pipes can be drawn out forward and downward from the outdoor unit.

3.When drawing out the pipe forward, draw out the pipe to outside via piping/wiring panel, and keep space of 500mm or more from the main pipe connecting the outdoor unit with the indoor unit, considering service work, etc. (For replacing the compressor, 500mm or more space is required.)

4.When drawing out the pipe downward, remove the knockout of the base plate of the outdoor unit, apply the pipe to outside of the outdoor unit, and perform piping at right/left or rear side. Leading pipe of the balancing should be within 4m.

500mm
or	more	(Right
(Left piping)		piping)

Drawing out forward

(Left piping) Drawing out downward

Hook
	Packed valve at
	suction gas side
Front panel	Packed valve
Piping/wiring panel	at liquid side
	Packed valve at balance side
(Rear piping)	(It is not used in this model.)
(Right piping)	Ball valve at discharge gas side

REQUIREMENT

For brazing, be sure to use nitrogen gas to avoid oxidation of pipe inside.

1.In a welding work for the refrigerant pipes, be sure to use the nitrogen gas in order to prevent oxidation inside of the pipes; otherwise clogging of the refrigerating cycle due to oxidized scale generates.

2.Use clean and new pipes for the refrigerant pipes and perform piping work so that water or dust is not mixed.

3.Be sure to use a double spanner to loosen or tighten the flare nut. If a single spanner is

used, a required tightening cannot be obtained. Tighten the flare not with the specified torque.

Outer dia. of copper pipe	Tightening torque (N•m)
12.7 mm	50 to 62 (5.0 to 6.2 kgf-m)
15.9 mm	68 to 82 (6.8 to 8.2 kgf-m)

29

Pipe connecting method of valve (Example)

Using the attached pipes as shown in the following figure, braze elbows, sockets, and pipes which are procured locally.

MMY-		Drawing out forward	Drawing out downward
	Liquid pipe	Use the attached pipe for connection.	Pipe connection at the local site
			(Bend rightward slightly.)
	Discharge gas pipe	Use the attached pipe (L-shape) and connect it	Use the attached pipe (Straight pipe) and connect
		with socket.	it with socket.
	Suction gas pipe	Cut L-shape pipe and connect it with elbow,	Cut L-shape pipe and connect it with attached pipe
		attached pipe and socket.	and socket.

	Suction gas pipe	Suction gas pipe	Suction gas pipe	Suction gas pipe
MAP0801FT8	Discharge	Cut	Discharge	Cut
	gas pipe
MAP1001FT8			gas pipe

	Liquid pipe		Liquid pipe
		L-shape pipe
				L-shape pipe
		Attached pipe	Attached
		Pipe	pipe	Attached pipe
		Attached pipe
		Socket	Pipe	Socket
	Attached pipe		Socket
				Pipe
		Pipe	Pipe
	Socket
		Pipe
Liquid pipe	Use the attached pipe for connection.		Pipe connection at the local site
			(Bend rightward slightly.)
Discharge gas pipe Use the attached pipe and connect it with socket.			Use the attached pipe (Straight pipe) and connect
			it with socket.
Suction gas pipe	Cut L-shape pipe and connect it with attached		Cut L-shape pipe and connect it with attached pipe
	pipe.		and socket.

Suction gas pipe	Suction gas pipe	Suction gas pipe	Suction gas pipe
Discharge	Cut	Discharge	Cut
gas pipe
		gas pipe
MAP1201FT8

Liquid pipe		Liquid pipe
	L-shape pipe
			L-shape pipe
	Attached pipe	Attached
		pipe	Attached pipe
	Pipe
		Pipe	Socket
Attached pipe		Socket
			Pipe
	Pipe	Pipe
Socket	Pipe

30