Mitsubishi Electronics PURY-P72, PURY-P144, P168, P120YTHMU-A, P240YTSHMU-A User Manual

Safety Precautions

Before installing the unit, thoroughly read the following safety precautions.Observe these safety precautions for your safety.

WARNING

This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid the risk of serious injury or death.

CAUTION

This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid the risk of serious injury or damage to the unit.

After reading this manual, give it to the user to retain for future reference.

Keep this manual for easy reference. When the unit is moved or repaired, give this manual to those who provide these services.

When the user changes, make sure that the new user receives this manual.

WARNING

Ask your dealer or a qualified technician to install the unit.

Improper installation by the user may result in water leakage, electric shock, smoke, and/or fire.

Properly install the unit on a surface that can withstand the weight of the unit.

Unit installed on an unstable surface may fall and cause injury.

Only use specified cables. Securely connect each cable so that the terminals do not carry the weight of the cable.

Improperly connected or fixed cables may produce heat and start a fire.

Take appropriate safety measures against strong winds and earthquakes to prevent the unit from falling.

If the unit is not installed properly, the unit may fall and cause serious injury to the person or damage to the unit.

Do not make any modifications or alterations to the unit. Consult your dealer for repair.

Improper repair may result in water leakage, electric shock, smoke, and/or fire.

Do not touch the heat exchanger fins.

The fins are sharp and dangerous.

In the event of a refrigerant leak, thoroughly ventilate the room.

If refrigerant gas leaks and comes in contact with an open flame, poisonous gases will be produced.

When installing the All-Fresh type units, take it into consideration that the outside air may be discharged directly into the room when the thermo is turned off.

Direct exposure to outdoor air may have an adverse effect on health. It may also result in food spoilage.

Properly install the unit according to the instructions in the installation manual.

Improper installation may result in water leakage, electric shock, smoke, and/or fire.

Have all electrical work performed by an authorized electrician according to the local regulations and instructions in this manual, and a dedicated circuit must be used.

Insufficient capacity of the power supply circuit or improper installation may result in malfunctions of the unit, electric shock, smoke, and/or fire.

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WARNING

Securely attach the terminal block cover (panel) to the unit.

If the terminal block cover (panel) is not installed properly, dust and/or water may infiltrate and pose a risk of electric shock, smoke, and/or fire.

Only use the type of refrigerant that is indicated on the unit when installing or reinstalling the unit.

Infiltration of any other type of refrigerant or air into the unit may adversely affect the refrigerant cycle and may cause the pipes to burst or explode.

When installing the unit in a small room, exercise caution and take measures against leaked refrigerant reaching the limiting concentration.

Consult your dealer with any questions regarding limiting concentrations and for precautionary measures before installing the unit. Leaked refrigerant gas exceeding the limiting concentration causes oxygen deficiency.

Consult your dealer or a specialist when moving or reinstalling the unit.

Improper installation may result in water leakage, electric shock, and/or fire.

After completing the service work, check for a gas leak.

If leaked refrigerant is exposed to a heat source, such as a fan heater, stove, or electric grill, poisonous gases may be produced.

Do not try to defeat the safety features of the unit.

Forced operation of the pressure switch or the temperature switch by defeating the safety features of these devices, or the use of accessories other than the ones that are recommended by MITSUBISHI may result in smoke, fire, and/or explosion.

Only use accessories recommended by MITSUBISHI.

Ask a qualified technician to install the unit. Improper installation by the user may result in water leakage, electric shock, smoke, and/or fire.

Control box houses high-voltage parts.

When opening or closing the front panel of the control box, do not let it come into contact with any of the internal components. Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes, and confirm that the voltage between FT-P and FT-N on INV Board has dropped to DC20V or less. (It takes about 10 minutes to discharge electricity after the power supply is turned off.)

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Precautions for handling units for use with R410A

CAUTION

Do not use the existing refrigerant piping.

A large amount of chlorine that is contained in the residual refrigerant and refrigerator oil in the existing piping may cause the refrigerator oil in the new unit to deteriorate.R410A is a high-pressure refrigerant and can cause the existing pipes to burst.

Use refrigerant pipes made of phosphorus deoxidized copper. Keep the inner and outer surfaces of the pipes clean and free of such contaminants as sulfur, oxides, dust, dirt, shaving particles, oil, and water.

These types of contaminants inside the refrigerant pipes may cause the refrigerant oil to deteriorate.

Store the pipes to be installed indoors, and keep both ends of the pipes sealed until immediately before brazing. (Keep elbows and other joints wrapped in plastic.)

Infiltration of dust, dirt, or water into the refrigerant system may cause the refrigerating machine oil to deteriorate or cause the unit to malfunction.

Use a small amount of ester oil, ether oil, or alkylbenzene to coat flares and flanges.

Infiltration of a large amount of mineral oil may cause the refrigerating machine oil to deteriorate.

Charge liquid refrigerant (as opposed to gaseous refrigerant) into the system.

If gaseous refrigerant is charged into the system, the composition of the refrigerant in the cylinder will change and may result in performance loss.

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

If a vacuum pump that is not equipped with a reverse-flow check valve is used, the vacuum pump oil may flow into the refrigerant cycle and cause the refrigerating machine oil to deteriorate.

Prepare tools for exclusive use with R410A. Do not use the following tools if they have been used with the conventional refrigerant (gauge manifold, charging hose, gas leak detector, reverse-flow check valve, refrigerant charge base, vacuum gauge, and refrigerant recovery equipment.).

If the refrigerant or the refrigerating machine oil left on these tools are mixed in with R410A, it may cause the refrigerating machine oil to deteriorate.

Infiltration of water may cause the refrigerating machine oil to deteriorate.

Gas leak detectors for conventional refrigerants will not detect an R410A leak because R410A is free of chlorine.

Do not use a charging cylinder.

If a charging cylinder is used, the composition of the refrigerant will change, and the unit may experience power loss.

Exercise special care when handling the tools for use with R410A.

Infiltration of dust, dirt, or water into the refrigerant system may cause the refrigerating machine oil to deteriorate.

Only use refrigerant R410A.

The use of other types of refrigerant that contain chlorine (i.e. R22) may cause the refrigerating machine oil to deteriorate.

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Before installing the unit

WARNING

Do not install the unit where a gas leak may occur.

If gaseous refrigerant leaks and piles up around the unit, it may be ignited.

Do not use the unit to keep food items, animals, plants, artifacts, or for other special purposes.

The unit is not designed to preserve food products.

Do not use the unit in an unusual environment.

Do not install the unit where a large amount of oil or steam is present or where acidic or alkaline solutions or chemical sprays are used frequently. Doing so may lead to a remarkable drop in performance, electric shock, malfunctions, smoke, and/or fire.

The presence of organic solvents or corrosive gas (i.e. ammonia, sulfur compounds, and acid) may cause gas leakage or water leakage.

When installing the unit in a hospital, take appropriate measures to reduce noise interference.

High-frequency medical equipment may interfere with the normal operation of the air conditioner or vice versa.

Do not install the unit on or over things that cannot get wet.

When the humidity level exceeds 80% or if the drainage system is clogged, the indoor unit may drip water. Drain water is also discharged from the outdoor unit. Install a centralized drainage system if necessary.

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Before installing the unit (moving and reinstalling the unit) and performing electrical work

CAUTION

Properly ground the unit.

Do not connect the grounding wire to a gas pipe, water pipe, lightning rod, or grounding wire from a telephone pole. Improper grounding may result in electric shock, smoke, fire, and/or malfunction due to noise interference.

Do not put tension on the power supply wires.

If tension is put on the wires, they may break and result in excessive heat, smoke, and/or fire.

Install an earth leakage breaker to avoid the risk of electric shock.

Failure to install an earth leakage breaker may result in electric shock, smoke, and/or fire.

Use the kind of power supply wires that are specified in the installation manual.

The use of wrong kind of power supply wires may result in current leak, electric shock, and/or fire.

Use breakers and fuses (current breaker, remote switch <switch + Type-B fuse>, moulded case circuit breaker) with the proper current capacity.

The use of wrong capacity fuses, steel wires, or copper wires may result in malfunctions, smoke, and/or fire.

Do not spray water on the air conditioner or immerse the air conditioner in water.

Otherwise, electric shock and/or fire may result.

When handling units, always wear protective gloves to protect your hands from metal parts and high-tempera- ture parts.

Periodically check the installation base for damage.

If the unit is left on a damaged platform, it may fall and cause injury.

Properly install the drain pipes according to the instructions in the installation manual. Keep them insulated to avoid dew condensation.

Improper plumbing work may result in water leakage and damage to the furnishings.

Exercise caution when transporting products.

Products weighing more than 20 kg should not be carried alone.

Do not carry the product by the PP bands that are used on some products.

Do not touch the heat exchanger fins. They are sharp and dangerous.

When lifting the unit with a crane, secure all four corners to prevent the unit from falling.

Properly dispose of the packing materials.

Nails and wood pieces in the package may pose a risk of injury.

Plastic bags may pose a risk of choking hazard to children. Tear plastic bags into pieces before disposing of them.

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Before the test run

CAUTION

Turn on the unit at least 12 hours before the test run.

Keep the unit turned on throughout the season. If the unit is turned off in the middle of a season, it may result in malfunctions.

To avoid the risk of electric shock or malfunction of the unit, do not operate switches with wet hands.

Do not touch the refrigerant pipes with bare hands during and immediately after operation.

During or immediately after operation, certain parts of the unit such as pipes and compressor may be either very cold or hot, depending on the state of the refrigerant in the unit at the time. To reduce the risk of frost bites and burns, do not touch these parts with bare hands.

Do not operate the unit without panels and safety guards.

Rotating, high-temperature, or high-voltage parts on the unit pose a risk of burns and/or electric shock.

Do not turn off the power immediately after stopping the operation.

Keep the unit on for at least five minutes before turning off the power to prevent water leakage or malfunction.

Do not operate the unit without the air filter.

Dust particles may build up in the system and cause malfunctions.

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CONTENTS
I Read Before Servicing
[1] Read Before Servicing..............................................................................................................	3
[2] Necessary Tools and Materials ................................................................................................	4
[3] Piping Materials ........................................................................................................................	5
[4] Storage of Piping ......................................................................................................................	7
[5] Pipe Processing........................................................................................................................	7
[6] Brazing......................................................................................................................................	8
[7] Air Tightness Test.....................................................................................................................	9
[8] Vacuum Drying (Evacuation) ..................................................................................................	10
[9] Refrigerant Charging ..............................................................................................................	12
[10] Remedies to be taken in case of a Refrigerant Leak............................................................	12
[11] Characteristics of the Conventional and the New Refrigerants ............................................	13
[12] Notes on Refrigerating Machine Oil......................................................................................	14
II Restrictions
[1] System configuration ..............................................................................................................	17
[2] Types and Maximum allowable Length of Cables ..................................................................	18
[3] Switch Settings and Address Settings....................................................................................	19
[4] Sample System Connection ...................................................................................................	25
[5] An Example of a System to which an MA Remote Controller is connected ...........................	26
[6] An Example of a System to which an M-NET Remote Controller is connected .....................	38
[7] An Example of a System to which both MA Remote Controller and M-NET Remote
Controller are connected ........................................................................................................	40
[8] Restrictions on Pipe Length....................................................................................................	43
III Outdoor Unit Components
[1] Outdoor Unit Components and Refrigerant Circuit .................................................................	57
[2] Control Box of the Outdoor Unit..............................................................................................	60
[3] Outdoor Unit Circuit Board......................................................................................................	64
[4] BC Controller Components.....................................................................................................	74
[5] Control Box of the BC Controller ............................................................................................	77
[6] BC Controller Circuit Board ....................................................................................................	78
IV Remote Controller
[1] Functions and Specifications of MA and ME Remote Controllers ..........................................	83
[2] Group Settings and Interlock Settings via the ME Remote Controller ....................................	84
[3] Interlock Settings via the MA Remote Controller ....................................................................	88
[4] Using the built-in Temperature Sensor on the Remote Controller..........................................	89
V Electrical Wiring Diagram
[1] Electrical Wiring Diagram of the Outdoor Unit ........................................................................	93
[2] Electrical Wiring Diagram of the BC Controller.......................................................................	96
[3] Electrical Wiring Diagram of Transmission Booster..............................................................	105
VI Refrigerant Circuit
[1] Refrigerant Circuit Diagram ..................................................................................................	109
[2] Principal Parts and Functions...............................................................................................	116
VII Control
[1] Functions and Factory Settings of the Dipswitches..............................................................	125
[2] Controlling the Outdoor Unit .................................................................................................	132
[3] Controlling BC Controller ......................................................................................................	145
[4] Operation Flow Chart............................................................................................................	146
VIII Test Run Mode
[1] Items to be checked before a Test Run................................................................................	155
[2] Test Run Method ..................................................................................................................	156
[3] Operating Characteristic and Refrigerant Amount................................................................	157
[4] Adjusting the Refrigerant Amount.........................................................................................	157
[5] Refrigerant Amount Adjust Mode..........................................................................................	160
[6] The following symptoms are normal.....................................................................................	162
[7] Standard Operation Data (Reference Data) .........................................................................	163

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CONTENTS
IX Troubleshooting
[1] Error Code Lists....................................................................................................................	179
[2] Responding to Error Display on the Remote Controller........................................................	182
[3] Investigation of Transmission Wave Shape/Noise ...............................................................	270
[4] Troubleshooting Principal Parts............................................................................................	273
[5] Refrigerant Leak ...................................................................................................................	314
[6] Compressor Replacement Instructions.................................................................................	316
[7] Servicing the BC controller ...................................................................................................	327
[8] Troubleshooting Using the Outdoor Unit LED Error Display.................................................	330
X LED Monitor Display on the Outdoor Unit Board
[1] How to Read the LED on the Service Monitor ......................................................................	333

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	I Read Before Servicing
[1]	Read Before Servicing.......................................................................................................	3
[2]	Necessary Tools and Materials..........................................................................................	4
[3]	Piping Materials .................................................................................................................	5
[4]	Storage of Piping ...............................................................................................................	7
[5]	Pipe Processing.................................................................................................................	7
[6]	Brazing...............................................................................................................................	8
[7]	Air Tightness Test..............................................................................................................	9
[8]	Vacuum Drying (Evacuation) ...........................................................................................	10
[9]	Refrigerant Charging........................................................................................................	12
[10]	Remedies to be taken in case of a Refrigerant Leak.......................................................	12
[11]	Characteristics of the Conventional and the New Refrigerants .......................................	13
[12]	Notes on Refrigerating Machine Oil.................................................................................	14

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[I Read Before Servicing ]

[1]Read Before Servicing

1.Check the type of refrigerant used in the system to be serviced. Refrigerant Type

Multi air conditioner for building application CITY MULTI R2 THMU-A, YHMU-A series R410A

2.Check the symptoms exhibited by the unit to be serviced.

Refer to this service handbook for symptoms relating to the refrigerant cycle.

3.Thoroughly read the safety precautions at the beginning of this manual.

4.Preparing necessary tools: Prepare a set of tools to be used exclusively with each type of refrigerant.

Refer to "Necessary Tools and Materials" for information on the use of tools.(page 4)

5.Verification of the connecting pipes: Verify the type of refrigerant used for the unit to be moved or replaced.

Use refrigerant pipes made of phosphorus deoxidized copper. Keep the inner and outer surfaces of the pipes clean and free of such contaminants as sulfur, oxides, dust, dirt, shaving particles, oil, and water.

These types of contaminants inside the refrigerant pipes may cause the refrigerant oil to deteriorate.

6.If there is a leak of gaseous refrigerant and the remaining refrigerant is exposed to an open flame, a poisonous gas hydrofluoric acid may form. Keep workplace well ventilated.

CAUTION

Install new pipes immediately after removing old ones to keep moisture out of the refrigerant circuit.

The use of refrigerant that contains chloride, such as R22, will cause the refrigerating machine oil to deteriorate.

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[ I Read Before Servicing ]

[2] Necessary Tools and Materials

Prepare the following tools and materials necessary for installing and servicing the unit.

Tools for use with R410A (Adaptability of tools that are for use with R22 or R407C) 1. To be used exclusively with R410A (not to be used if used with R22 or R407C)

		Tools/Materials	Use	Notes
		Gauge Manifold	Evacuation and refrigerant charging	Higher than 5.09MPa[738psi] on the
				high-pressure side
		Charging Hose	Evacuation and refrigerant charging	The hose diameter is larger than the
				conventional model.
		Refrigerant Recovery Cylinder	Refrigerant recovery
		Refrigerant Cylinder	Refrigerant charging	The refrigerant type is indicated. The
				cylinder is pink.
		Charging Port on the Refrigerant Cylinder	Refrigerant charging	The charge port diameter is larger
				than that of the current port.
		Flare Nut	Connection of the unit with the pipes	Use Type-2 Flare nuts.
2. Tools and materials that may be used with R410A with some restrictions
		Tools/Materials	Use	Notes
		Gas Leak Detector	Gas leak detection	The ones for use with HFC refrigerant
				may be used.
		Vacuum Pump	Vacuum drying	May be used if a check valve adapter
				is attached.
		Flare Tool	Flare processing	Flare processing dimensions for the
				piping in the system using the new re-
				frigerant differ from those of R22. Re-
				fer to I [3] Piping Materials.
		Refrigerant Recovery Equipment	Refrigerant recovery	May be used if compatible with
				R410A.
3. Tools and materials that are used with R22 or R407C that may also be used with R410A
		Tools/Materials	Use	Notes
		Vacuum Pump with a Check Valve	Vacuum drying
		Bender	Bending pipes
		Torque Wrench	Tightening flare nuts	Only the flare processing dimensions
				for pipes that have a diameter of
				ø12.70 (1/2") and ø15.88 (5/8") have
				been changed.
		Pipe Cutter	Cutting pipes
		Welder and Nitrogen Cylinder	Welding pipes
		Refrigerant Charging Meter	Refrigerant charging
		Vacuum Gauge	Vacuum level check
4. Tools and materials that must not be used with R410A
		Tools/Materials	Use	Notes
		Charging Cylinder	Refrigerant charging	Prohibited to use

Tools for R410A must be handled with special care to keep moisture and dust from infiltrating the cycle.

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[ I Read Before Servicing ]

[3] Piping Materials

		Do not use the existing piping!
1. Copper pipe materials
	O-material (Annealed)		Soft copper pipes (annealed copper pipes). They can easily be bent with hands.
	1/2H-material (Drawn)		Hard copper pipes (straight pipes). They are stronger than the O-material (Annealed)
			at the same radial thickness.

The distinction between O-materials (Annealed) and 1/2H-materials (Drawn) is made based on the strength of the pipes themselves.

2. Types of copper pipes

Maximum working pressure	Refrigerant type
3.45 MPa [500psi]	R22, R407C etc.
4.30 MPa [624psi]	R410A etc.

3.Piping materials/Radial thickness

Use refrigerant pipes made of phosphorus deoxidized copper.

The operation pressure of the units that use R410A is higher than that of the units that use R22. Use pipes that have at least the radial thickness specified in the chart below.

(Pipes with a radial thickness of 0.7 mm [28mil] or less may not be used.)

	Pipe size (mm[in.])		Radial thickness (mm [mil])	Type
	ø6.35	[1/4"]	0.8t [32t]
	ø9.52	[3/8"]	0.8t [32t]	O-material (Annealed)
	ø12.7	[1/2"]	0.8t [32t]
	ø15.88	[5/8"]	1.0t [40t]
	ø19.05	[3/4"]	1.0t [40t]
	ø22.2	[7/8"]	1.0t [40t]
	ø25.4	[1"]	1.0t [40t]
				1/2H-material,
	ø28.58	[1-1/8"]	1.0t [40t]
				H-material (Drawn)
	ø31.75	[1-1/4"]	1.1t [44t]
	ø34.93	[1-3/8"]	1.2t [48t]
	ø41.28	[1-5/8"]	1.4t [56t]

The pipes in the system that uses the refrigerant currently on the market are made with O-material (Annealed), even if the pipe diameter is less than ø19.05 (3/4"). For a system that uses R410A, use pipes that are made with 1/2H-material (Drawn) unless the pipe diameter is at least ø19.05 (3/4") and the radial thickness is at least 1.2t.

The figures in the radial thickness column are based on the Japanese standards and provided only as a reference. Use pipes that meet the local standards.

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[I Read Before Servicing ]

4.Thickness and refrigerant type indicated on the piping materials

Ask the pipe manufacturer for the symbols indicated on the piping material for new refrigerant.

5.Flare processing (O-material (Annealed) and OL-material only)

The flare processing dimensions for the pipes that are used in the R410A system are larger than those in the R22 system. Flare processing dimensions (mm[in.])

	Pipe size (mm[in.])		A dimension (mm)
			R410A	R22, R407C
	ø6.35	[1/4"]	9.1	9.0	A
					Dimension
	ø9.52	[3/8"]	13.2	13.0
	ø12.7	[1/2"]	16.6	16.2
	ø15.88	[5/8"]	19.7	19.4
	ø19.05	[3/4"]	24.0	23.3

(ø19.05 pipes should have a radial thickness of 1.2 t and be made of annealed materials.)

If a clutch-type flare tool is used to flare the pipes in the system using R410A, the length of the pipes must be between 1.0 and 1.5 mm. For margin adjustment, a copper pipe gauge is necessary.

6.Flare nut

The flare nut type has been changed to increase the strength. The size of some of the flare nuts have also been changed. Flare nut dimensions (mm[in.])

	Pipe size (mm[in.])		B dimension (mm)
			R410A	R22, R407C
	ø6.35	[1/4"]	17.0	17.0
	ø9.52	[3/8"]	22.0	22.0
	ø12.7	[1/2"]	26.0	24.0
				Dimension B
	ø15.88	[5/8"]	29.0	27.0
	ø19.05	[3/4"]	36.0	36.0

The figures in the radial thickness column are based on the Japanese standards and provided only as a reference. Use pipes that meet the local standards.

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[ I Read Before Servicing ]

[4] Storage of Piping

1. Storage location

Store the pipes to be used indoors. (Warehouse at site or owner's warehouse)

If they are left outdoors, dust, dirt, or moisture may infiltrate and contaminate the pipe.

2. Sealing the pipe ends

Both ends of the pipes should be sealed until just before brazing.

Keep elbow pipes and T-joints in plastic bags.

The new refrigerator oil is 10 times as hygroscopic as the conventional refrigerating machine oil (such as Suniso) and, if not handled with care, could easily introduce moisture into the system. Keep moisture out of the pipes, for it will cause the oil to deteriorate and cause a compressor failure.

[5] Pipe Processing

Use a small amount of ester oil, ether oil, or alkylbenzene to coat flares and flanges.

Use a minimum amount of oil.

Use only ester oil, ether oil, and alkylbenzene.

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[ I Read Before Servicing ]

[6] Brazing

No changes have been made in the brazing procedures. Perform brazing with special care to keep foreign objects (such as oxide scale, water, and dust) out of the refrigerant system.

Example: Inside the brazed connection

Use of oxidized solder for brazing

Use of non-oxidized solder for brazing

1. Items to be strictly observed

Do not conduct refrigerant piping work outdoors if raining.Use non-oxidized solder.

Use a brazing material (BCuP-3) that requires no flux when brazing between copper pipes or between a copper pipe and copper coupling.

If installed refrigerant pipes are not immediately connected to the equipment, then braze and seal both ends.

2. Reasons

The new refrigerating machine oil is 10 times as hygroscopic as the conventional oil and is more likely to cause unit failure if water infiltrates into the system.

Flux generally contains chloride. Residual flux in the refrigerant circuit will cause sludge to form.

3.Notes

Do not use commercially available antioxidants because they may cause the pipes to corrode or refrigerating machine oil to deteriorate.

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[ I Read Before Servicing ]

[7] Air Tightness Test

No changes have been made in the detection method. Note that a refrigerant leak detector for R22 will not detect an R410A leak.

Halide torch

R22 leakage detector

1. Items to be strictly observed

Pressurize the equipment with nitrogen up to the design pressure (4.15MPa[601psi]), and then judge the equipment's air tightness, taking temperature variations into account.

Refrigerant R410A must be charged in its liquid state (vs. gaseous state).

2. Reasons

Oxygen, if used for an air tightness test, poses a risk of explosion. (Only use nitrogen to check air tightness.)

Refrigerant R410A must be charged in its liquid state. If gaseous refrigerant in the cylinder is drawn out first, the composition of the remaining refrigerant in the cylinder will change and become unsuitable for use.

3.Notes

Procure a leak detector that is specifically designed to detect an HFC leak. A leak detector for R22 will not detect an HFC(R410A) leak.

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[I Read Before Servicing ]

[8]Vacuum Drying (Evacuation)

(Photo1) 15010H

(Photo2) 14010

Recommended vacuum gauge:

ROBINAIR 14010 Thermistor Vacuum Gauge

1.Vacuum pump with a reverse-flow check valve (Photo1)

To prevent the vacuum pump oil from flowing into the refrigerant circuit during power OFF or power failure, use a vacuum pump with a reverse-flow check valve.

A reverse-flow check valve may also be added to the vacuum pump currently in use.

2.Standard of vacuum degree (Photo 2)

Use a vacuum pump that attains 0.5Torr(65Pa) or lower degree of vacuum after 5 minutes of operation, and connect it directly to the vacuum gauge. Use a pump well-maintained with an appropriate lubricant. A poorly maintained vacuum pump may not be able to attain the desired degree of vacuum.

3.Required precision of vacuum gauge

Use a vacuum gauge that registers a vacuum degree of 5Torr(650Pa) and measures at intervals of 1Torr(130Pa). (A recommended vacuum gauge is shown in Photo2.)

Do not use a commonly used gauge manifold because it cannot register a vacuum degree of 5Torr(650Pa).

4.Evacuation time

After the degree of vacuum has reached 5Torr(650Pa), evacuate for an additional 1 hour. (A thorough vacuum drying removes moisture in the pipes.)

Verify that the vacuum degree has not risen by more than 1Torr(130Pa) 1hour after evacuation. A rise by less than 1Torr(130Pa) is acceptable.

If the vacuum is lost by more than 1Torr(130Pa), conduct evacuation, following the instructions in section 6. Special vacuum drying.

5.Procedures for stopping vacuum pump

To prevent the reverse flow of vacuum pump oil, open the relief valve on the vacuum pump side, or draw in air by loosening the charge hose, and then stop the operation.

The same procedures should be followed when stopping a vacuum pump with a reverse-flow check valve.

6.Special vacuum drying

When 5Torr(650Pa) or lower degree of vacuum cannot be attained after 3 hours of evacuation, it is likely that water has penetrated the system or that there is a leak.

If water infiltrates the system, break the vacuum with nitrogen. Pressurize the system with nitrogen gas to 0.5kgf/cm2G(0.05MPa) and evacuate again. Repeat this cycle of pressurizing and evacuation either until the degree of vacuum below 5Torr(650Pa) is attained or until the pressure stops rising.

Only use nitrogen gas for vacuum breaking. (The use of oxygen may result in an explosion.)

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7. Notes

To evacuate air from the entire system

Applying a vacuum through the check joints at the refrigerant service valve on the high and low pressure sides (BV1 and 2) is not enough to attain the desired vacuum pressure.

Be sure to apply a vacuum through the check joints at the refrigerant service valve on the high and low pressure sides (BV1 and 2) and also through the check joints on the high and low pressure sides (CJ1 and 2).

To evacuate air only from the outdoor units

Apply a vacuum through the check joints on the high and low pressure sides (CJ1, and 2).To evacuate air from the indoor units and extension pipes

Apply a vacuum through the check joints at the refrigerant service valve on the high and low pressure sides (BV1 and 2).

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[9]Refrigerant Charging

Cylinder with a siphon

Cylinder without a siphon

Cylin-	Cylin-
	der
der
Cylinder color R410A is pink.	Refrigerant charging in the liquid state
Valve	Valve

liquid

liquid

1.Reasons

R410A is a pseudo-azeotropic HFC blend (boiling point R32=-52°C[-62°F], R125=-49°C[-52°F]) and can almost be handled the same way as a single refrigerant, such as R22. To be safe, however, draw out the refrigerant from the cylinder in the liquid phase. If the refrigerant in the gaseous phase is drawn out, the composition of the remaining refrigerant will change and become unsuitable for use.

2.Notes

When using a cylinder with a siphon, refrigerant is charged in the liquid state without the need for turning it upside down. Check the type of the cylinder on the label before use.

[10] Remedies to be taken in case of a Refrigerant Leak

If the refrigerant leaks out, it may be replenished. The entire refrigerant does not need to be replaced. (Charge refrigerant in the liquid state.)

Refer to "IX [5] Refrigerant Leak".(page 314)

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[11]Characteristics of the Conventional and the New Refrigerants

1.Chemical property

As with R22, the new refrigerant (R410A) is low in toxicity and chemically stable nonflammable refrigerant.

However, because the specific gravity of vapor refrigerant is greater than that of air, leaked refrigerant in a closed room will accumulate at the bottom of the room and may cause hypoxia.

If exposed to an open flame, refrigerant will generate poisonous gases. Do not perform installation or service work in a confined area.

	New Refrigerant (HFC type)		Conventional Refriger-
			ant (HCFC type)
	R410A	R407C	R22
	R32/R125	R32/R125/R134a	R22
Composition (wt%)	(50/50)	(23/25/52)	(100)
Type of Refrigerant	Pseudo-azeotropic	Non-azeotropic	Single Refrigerant
	Refrigerant	Refrigerant
Chloride	Not included	Not included	Included
Safety Class	A1/A1	A1/A1	A1
Molecular Weight	72.6	86.2	86.5
Boiling Point (°C/°F)	-51.4/-60.5	-43.6/-46.4	-40.8/-41.4
Steam Pressure	1.557/226	0.9177/133	0.94/136
(25°C,MPa/77°F,psi) (gauge)
Saturated Steam Density	64.0	42.5	44.4
(25°C,kg/m3/77°F,psi)
Flammability	Nonflammable	Nonflammable	Nonflammable
Ozone Depletion Coefficient (ODP)*1	0	0	0.055
Global Warming Coefficient (GWP)*2	1730	1530	1700
Refrigerant Charging Method	Refrigerantchargingin	Refrigerantchargingin	Refrigerantchargingin
	the liquid state	the liquid state	the gaseous state
Replenishment of Refrigerant after a Refrigerant	Available	Available	Available
Leak
*1 When CFC11 is used as a reference
*2 When CO2 is used as a reference

2.Refrigerant composition

R410A is a pseudo-azeotropic HFC blend and can almost be handled the same way as a single refrigerant, such as R22. To be safe, however, draw out the refrigerant from the cylinder in the liquid phase. If the refrigerant in the gaseous phase is drawn out, the composition of the remaining refrigerant will change and become unsuitable for use.

If the refrigerant leaks out, it may be replenished. The entire refrigerant does not need to be replaced.

3.Pressure characteristics

The pressure in the system using R410A is 1.6 times as great as that in the system using R22.

		Pressure (gauge)
Temperature (°C/°F)	R410A	R407C	R22
	MPa/psi	MPa/psi	MPa/psi
-20/-4	0.30/44	0.18/26	0.14/20
0/32	0.70/102	0.47/68	0.40/58
20/68	1.34/194	0.94/136	0.81/117
40/104	2.31/335	1.44/209	1.44/209
60/140	3.73/541	2.44/354	2.33/338
65/149	4.17/605	2.75/399	2.60/377

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[12]Notes on Refrigerating Machine Oil

1.Refrigerating machine oil in the HFC refrigerant system

HFC type refrigerants use a refrigerating machine oil different from that used in the R22 system.

Note that the ester oil used in the system has properties that are different from commercially available ester oil.

Refrigerant	Refrigerating machine oil
R22	Mineral oil
R407C	Ester oil
R410A	Ester oil

2.Effects of contaminants*1

Refrigerating machine oil used in the HFC system must be handled with special care to keep contaminants out. The table below shows the effect of contaminants in the refrigerating machine oil on the refrigeration cycle.

3.The effects of contaminants in the refrigerating machine oil on the refrigeration cycle.

Cause				Symptoms	Effects on the refrigerant cycle
Water infiltration				Frozen expansion valve	Clogged expansion valve and capillary tubes
				and capillary tubes	Poor cooling performance
					Compressor overheat
				Sludge formation and ad-	Motor insulation failure
					Burnt motor
		Hydrolysis		hesion
					Coppering of the orbiting scroll
				Acid generation
					Lock
				Oxidization
					Burn-in on the orbiting scroll
				Oil degradation
Air infiltration		Oxidization
		Adhesion to expansion valve and capillary			Clogged expansion valve, capillary tubes, and
		tubes			drier
	Dust, dirt				Poor cooling performance
					Compressor overheat
Infiltration of		Infiltration of contaminants into the com-			Burn-in on the orbiting scroll
		pressor
contaminants
		Sludge formation and adhesion			Clogged expansion valve and capillary tubes
	Mineral oil				Poor cooling performance
					Compressor overheat
	etc.
		Oil degradation			Burn-in on the orbiting scroll

*1. Contaminants is defined as moisture, air, processing oil, dust/dirt, wrong types of refrigerant, and refrigerating machine oil.

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	II Restrictions
[1]	System configuration .......................................................................................................	17
[2] Types and Maximum allowable Length of Cables ...........................................................		18
[3] Switch Settings and Address Settings .............................................................................		19
[4]	Sample System Connection.............................................................................................	25
[5] An Example of a System to which an MA Remote Controller is connected.....................		26
[6] An Example of a System to which an M-NET Remote Controller is connected...............		38
[7] An Example of a System to which both MA Remote Controller and M-NET Remote
	Controller are connected..................................................................................................	40
[8] Restrictions on Pipe Length.............................................................................................		43

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[ II Restrictions ]

[1] System configuration

1. Table of compatible indoor units

The table below summarizes the types of indoor units that are compatible with different types of outdoor units.

	Outdoor	Composing units		Maximum total capacity	Maximumnumber	Types of connectable in-
	units			of connectable indoor	of connectable in-	door units
				units	door units
	72	-	-	36 - 108	18	P06 - P96 models
						R410A series indoor units
	96	-	-	48 - 144	24
	120	-	-	60 - 180	30
	144	72	72	72 - 216	36
	168	96	72	84 - 252	42
	192	96	96	96 - 288	48
	216	120	96	108 - 324	50
	240	120	120	120 - 360	50

1)"Maximum total capacity of connectable indoor units" refers to the sum of the numeric values in the indoor unit model names.

2)If the total capacity of the indoor units that are connected to a given outdoor unit exceeds the capacity of the outdoor unit, the indoor units will not be able to perform at the rated capacity when they are operated simultaneously. Select a combination of units so that the total capacity of the connected indoor units is at or below the capacity of the outdoor unit whenever possible.

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[2] Types and Maximum allowable Length of Cables

1. Wiring work

(1) Notes

1)Have all electrical work performed by an authorized electrician according to the local regulations and instructions in this manual.

2)Install external transmission cables at least 5cm [1-31/32"] away from the power supply cable to avoid noise interference. (Do not put the control cable and power supply cable in the same conduit tube.)

3)Provide grounding for the outdoor unit as required.

4)Run the cable from the electric box of the indoor or outdoor unit in such way that the box is accessible for servicing.

5)Do not connect power supply wiring to the terminal block for transmission line. Doing so will damage the electronic components on the terminal block.

6)Use 2-core shielded cables as transmission cables.

Use a separate 2-core control cable for each refrigerant system. Do not use a single multiple-core cable to connect indoor units that belong to different refrigerant systems. The use of a multiple-core cable may result in signal transmission errors and malfunctions.

Outdoor unit											Outdoor unit
			BC Controller Indoor unit									BC Controller Indoor unit
TB TB		TB TB							TB TB		TB TB
3	7	3	7						3	7	3	7
		2-core shielded cable										multiple-core cable
			Remote Controller									Remote Controller
TB TB		TB TB							TB TB		TB TB
3	7	3	7						3	7	3	7

2-core shielded cable

TB3: Terminal block for indoor-outdoor transmission line TB7: Terminal block for centralized control

(2)Control wiring

Different types of control wiring are used for different systems.

Refer to section "[5] An Example of a System to which an MA Remote Controller is connected - [7] An Example of a System to which both MA Remote Controller and M-NET Remote Controller are connected" before performing wiring work.

Types and maximum allowable length of cables

Control lines are categorized into 2 types: transmission line and remote controller line.

Use the appropriate type of cables and observe the maximum allowable length specified for a given system. If a given system has a long transmission line or if a noise source is located near the unit, place the unit away from the noise source to reduce noise interference.

1) M-NET transmission line

		Facility	All facility types
		type
	Cable type	Type	Shielded cable CVVS, CPEVS, MVVS
		Number of	2-core cable
		cores
		Cable size	Larger than 1.25mm2 [AWG16]
	Maximum transmission
	line distance between the		200 m [656ft] max.
	outdoor unit and the far-
	thest indoor unit
	Maximum transmission
	line distance for central-		500 m [1640ft] max.
	ized control and Indoor/
			*The maximum overall line length from the power supply unit on the transmission lines for
	outdoor transmission line
			centralized control to each outdoor unit or to the system controller is 200m [656ft] max.
	(Maximum line distance
	via outdoor unit)

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[ II	Restrictions ]
2)	Remote controller wiring
				MA remote controller*1	M-NET remote controller*2
			Type	VCTF, VCTFK, CVV, CVS, VVR, VVF, VCT	Shielded cable MVVS
			Number of	2-core cable	2-core cable
			cores
		Cable type
				0.3 to 1.25mm2 *3	0.3 to 1.25mm2 *3
			Cable size	[AWG22 to 16]	[AWG22 to 16]
				(0.75 to 1.25mm2 ) *4	(0.75 to 1.25mm2 ) *4
				[AWG18 to 16]	[AWG18 to 16]
		Maximum overall line			The section of the cable that exceeds 10m
				200 m [656ft] max.	[32ft] must be included in the maximum in-
		length
					door-outdoor transmission line distance.

*1 MA remote controller refers to MA remote controller (PAR-20MAA, PAR-21MAA), MA simple remote controller, and wireless remote controller.

*2 M-NET remote controller refers to ME remote controller and ME simple remote controller.

*3 The use of cables that are smaller than 0.75mm2 [AWG18] is recommended for easy handling.

*4 When connected to the terminal block on the Simple remote controller, use cables that meet the cable size specifications shown in the parenthesis.

[3] Switch Settings and Address Settings

1.Switch setting

Refer to section "[5] An Example of a System to which an MA Remote Controller is connected - [7] An Example of a System to which both MA Remote Controller and M-NET Remote Controller are connected" before performing wiring work.

Set the switches while the power is turned off.

If the switch settings are changed while the unit is being powered, those changes will not take effect, and the unit will not function properly.

Units on which to set the switches		Symbol	Units to which the power must be shut off
CITY MULTI indoor unit	Main/sub unit	IC	Outdoor units *3 and Indoor units
LOSSNAY, OA processing unit *1		LC	Outdoor units *3 and LOSSNAY
M-NET remote controller	Main/sub remote	RC	Outdoor units *3
	controller
MA remote controller	Main/sub remote	MA	Indoor units
	controller
CITY MULTI outdoor unit*2		OC,OS	Outdoor units *3
BC controller	Main	BC	Outdoor units *3 and BC controller
	Sub1, 2	BS1, BS2	Outdoor units *3 and BC controller

*1. Applicable when LOSSNAY units are connected to the indoor-outdoor transmission line.

*2. The outdoor units in the same refrigerant circuit are automatically designated as OC and OS in the order of capacity from large to small (if two or more units have the same capacity, in the order of address from small to large).

*3. Turn off the power to all the outdoor units in the same refrigerant circuit.

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2. M-NET Address settings

(1) Address settings table

The need for address settings and the range of address setting depend on the configuration of the system.

Unit or controller		Sym-	Address	Setting method	Factory
		bol	setting		address
			range		setting
CITYMULTI	Main/sub unit	IC	0, 01 to	Assign the smallest address to the main indoor unit in the	00
indoor unit			50*1 *4 *6	group, and assign sequential address numbers to the rest
				of the indoor units in the same group.
M-NET
				In an R2 system with a sub BC controller, make the set-
adapter
				tings for the indoor units in the following order.
				(i) Indoor unit to be connected to the main BC controller
M-NET con-
				(ii) Indoor unit to be connected to sub BC controller 1
trol interface
				(iii) Indoor unit to be connected to sub BC controller 2
Free Plan				Make the settings for the indoor units in the way that the
adapter				formula "(i) < (ii) < (iii)" is true.
LOSSNAY, OA processing unit		LC	0, 01 to	Assign an arbitrary but unique address to each of these	00
			50*1 *4 *6	units after assigning an address to all indoor units.
M-NET re-	Main remote	RC	101 to	Add 100 to the smallest address of all the indoor units in	101
mote con-	controller		150	the same group.
troller
	Sub remote	RC	151 to	Add 150 to the smallest address of all the indoor units in
	controller		200*3	the same group.
MA remote controller		MA	No address settings required. (The main/sub setting must be made if		Main
			2 remote controllers are connected to the system.)
CITY MULTI outdoor unit		OC	0, 51 to	Assign an address that equals the lowest address of the in-	00
		OS	100*1 *2	door units in the same refrigerant circuit plus 50.
			*6	Assign sequential addresses to the outdoor units in the
				same refrigerant circuit. The outdoor units in the same re-
				frigerant circuit are automatically designated as OC and
				OS. *5
Auxiliary	BC controller	BC	0, 51 to	Assign an address that equals the address of the outdoor	00
outdoor unit	(main)		100*1 *2	unit in the same refrigerant system plus 1.
			*6	If a given address overlaps any of the addresses that are
				assigned to the outdoor units or to the sub BC controller,
				use a different, unused address within the setting range.
	BC controller	BS1	51 to	Assign an address to both the sub BC controller 1 and 2
	(sub1, 2)	BS2	100 *2	that equals the lowest address of the indoor units that
				are connected to each of them plus 50.
				If a sub BC controller is connected, the automatic startup
				function is not available.
System	Group remote con-	GR	201 to	Assign an address that equals the sum of the smallest	201
controller	troller	SC	250	group number of the group to be controlled and 200.
	System remote con-	SR		Assign an arbitrary but unique address within the range
	troller	SC		listed on the left to each unit.
	ON/OFF remote con-	AN		Assign an address that equals the sum of the smallest
	troller	SC		group number of the group to be controlled and 200.
	Schedule timer (com-	ST		Assign an arbitrary but unique address within the range	202
	patible with M-NET)	SC		listed on the left to each unit.
	Central controller	TR	0, 201 to	Assign an arbitrary but unique address within the range	000
	G(B)-50A	SC	250	listed on the left to each unit. The address must be set to
				"0" to control the K-control unit.
	LM adapter	SC	201 to	Assign an arbitrary but unique address within the range	247
			250	listed on the left to each unit.

*1. If a given address overlaps any of the addresses that are assigned to other units, use a different, unused address within the setting range.

*2. To set the outdoor unit address or the auxiliary outdoor unit address to "100," set the rotary switches to "50." *3. To set the M-NET remote controller address to "200," set the rotary switches to "00."

*4. Some models of indoor units have two or three control boards.

Assign an address to the No.1, No. 2, and No. 3 control boards so that the No. 2 control board address equals the No. 1 control board address plus 1, and that the No. 3 control board address equals the No. 1 control board address plus 2.

*5. The outdoor units in the same refrigerant circuit are automatically designated as OC, and OS. They are designated as OC, and OS in the descending order of capacity (ascending order of address if the capacities are the same).

*6. No address settings are required for units in a system with a single outdoor unit (with some exceptions). Address setting is required if a sub BC controller is connected.

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[II Restrictions ]

(2)Power supply switch connector connection on the outdoor unit

(Factory setting: The male power supply switch connector is connected to CN41.)

There are limitations on the total number of units that are connectable to each refrigerant system. Refer to the System Design Manual for details.

System configura-	Connection to	Powersupplyunit	Group operation	Power supply switch connector connection
tion	the system con-	for transmission	of units in a sys-
	troller	lines	tem with multiple
			outdoor units
System with one	_	_	_	Leave CN41 as it is
outdoor unit				(Factory setting)
System with multi-	Not connected	_	Not grouped
ple outdoor units
			Grouped	Disconnect the male connector from the fe-
				male power supply switch connector (CN41)
	Withconnection	Not required	Grouped/not
				and connect it to the female power supply
	to the indoor		grouped	switch connector (CN40) on only one of the
	unit system			*2
				outdoor units.
	Withconnection	Not required*1	Grouped/not	*Connect the S (shielded) terminal on the
	to the central-	(Powered from	grouped	terminal block (TB7) on the outdoor unit
	ized control sys-	the outdoor unit)		whose CN41 was replaced with CN40 to
	tem			the ground terminal (		) on the electric box.
		Required *1	Grouped/not	Leave CN41 as it is
			grouped	(Factory setting)

*1 The need for a power supply unit for transmission lines depends on the system configuration.

*2 The replacement of the power jumper connector from CN41 to CN40 must be performed on only one outdoor unit in the system.

(3) Settings for the centralized control switch for the outdoor unit (Factory setting: SW2-1 are set to OFF.)

	System configuration		Centralized control switch settings *1
Connection to the system controller		Not connected	Leave it to OFF. (Factory setting)
Connection to the system controller		Connected*2	ON
*1.	Set SW2-1 on all outdoor units in the same refrigerant circuit to the same setting.
*2.	When only the LM adapter is connected, leave SW2-1 to OFF (as it is).

(4)Selecting the position of temperature detection for the indoor unit (Factory setting: SW1-1 set to "OFF".)

To stop the fan during heating Thermo-OFF (SW1-7 and 1-8 on the indoor units to be set to ON), use the built-in thermistor

on the remote controller or an optional thermistor.

1) To use the built-in sensor on the remote controller, set the SW1-1 to ON.

Some models of remote controllers are not equipped with a built-in temperature sensor. Use the built-in temperature sensor on the indoor unit instead.

When using the built-in sensor on the remote controller, install the remote controller where room temperature can be detected. (Note) Factory setting for SW1-1 on the indoor unit of the All-Fresh Models is ON.

2) When an optional temperature sensor is used, set SW1-1 to OFF, and set SW3-8 to ON.

When using an optional temperature sensor, install it where room temperature can be detected.

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