Mitsubishi Electric CITY MULTI P500YMF-C How to use

AIR CONDITIONERS CITY MULTI
Models PURY-P400, P500YMF-C
Service Handbook
Service Handbook PURY-P400, P500YMF-C
HEAD OFFICE MITSUBISHI DENKI BLDG. MARUNOUCHI TOKYO 100-0005 TELEX J24532 CABLE MELCO TOKYO
New publication effective Aug 2002
Specifications subject to change without notice.
Service Handbook PURY-P400, P500YMF-C
Issued in Aug 2002 F1105-214(MDOC)
Printed in Japan

Contents
1PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT..... 3
[1] Storage of Piping Material................................................................. 4
[2] Piping Machining............................................................................... 5
[3] Brazing.............................................................................................. 6
[4] Airtightness Test................................................................................ 7
[5] Vacuuming ........................................................................................ 7
[6] Charging of Refrigerant..................................................................... 8
[7] Dryer ................................................................................................. 8
2COMPONENT OF EQUIPMENT ............................................................. 9
[1] Appearance of Components ............................................................. 9
[2] Refrigerant Circuit Diagram and Thermal Sensor ........................... 17
[3] Electrical Wiring Diagram................................................................ 20
[4] Standard Operation Data ................................................................ 24
[5] Function of Dip SW and Rotary SW................................................ 26
3TEST RUN ............................................................................................. 29
[1] Before Test Run............................................................................... 29
[2] Test Run Method............................................................................. 33
4GROUPING REGISTRATION OF INDOOR UNITS WITH M-NET
REMOTE CONTROLLER ...................................................................... 34
5CONTROL.............................................................................................. 40
[1] Control of Outdoor Unit ................................................................... 40
[2] Control of BC Controller.................................................................. 49
[3] Operation Flow Chart...................................................................... 50
[4] List of Major Component Functions ................................................ 56
[5] Resistance of Temperature Sensor................................................. 59
6REFRIGERANT AMOUNT ADJUSTMENT............................................ 60
[1] Operating Characteristics and Refrigerant Amount ........................ 60
[2] Adjustment and Judgement of Refrigerant Amount ........................ 60
[3] Refrigerant VolumeAdjustment Mode Operation............................ 62
7TROUBLESHOOTING ........................................................................... 66
[1] Principal Parts................................................................................. 66
[2] BC Controller Disassembly Procedure............................................ 99
[3] Self-diagnosis and Countermeasures Depending on the Check
Code Displayed............................................................................. 104
[4] LED Monitor Display ..................................................................... 121
8PREPARATION, REPAIRSAND REFRIGERANT REFILLING WHEN
REPAIRING LEAKS .............................................................................141
[1] Location of leaks: Extension piping or indoor units (when cooling) ... 141
[2] Location of leaks: Outdoor unit (Cooling mode)............................ 142
[3] Location of leaks: Extension piping or indoor units (Heating mode).. 142
[4] Location of leaks: Outdoor unit (when heating)............................. 143
9CHECK THE COMPOSITION OF THE REFRIGERANT
(PURY-P200·250YMF-C only).................................................................144
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Contents
1PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT..... 3
[1] Storage of Piping Material................................................................. 4
[2] Piping Machining............................................................................... 5
[3] Brazing.............................................................................................. 6
[4] Airtightness Test................................................................................ 7
[5] Vacuuming ........................................................................................ 7
[6] Charging of Refrigerant..................................................................... 8
[7] Dryer ................................................................................................. 8
2COMPONENT OF EQUIPMENT ............................................................. 9
[1] Appearance of Components ............................................................. 9
[2] Refrigerant Circuit Diagram and Thermal Sensor ........................... 17
[3] Electrical Wiring Diagram................................................................ 20
[4] Standard Operation Data ................................................................ 24
[5] Function of Dip SW and Rotary SW................................................ 26
3TEST RUN ............................................................................................. 29
[1] Before Test Run............................................................................... 29
[2] Test Run Method............................................................................. 33
4GROUPING REGISTRATION OF INDOOR UNITS WITH M-NET
REMOTE CONTROLLER ...................................................................... 34
5CONTROL.............................................................................................. 40
[1] Control of Outdoor Unit ................................................................... 40
[2] Control of BC Controller.................................................................. 49
[3] Operation Flow Chart...................................................................... 50
[4] List of Major Component Functions ................................................ 56
[5] Resistance of Temperature Sensor................................................. 59
6REFRIGERANT AMOUNT ADJUSTMENT............................................ 60
[1] Operating Characteristics and Refrigerant Amount ........................ 60
[2] Adjustment and Judgement of Refrigerant Amount ........................ 60
[3] Refrigerant VolumeAdjustment Mode Operation............................ 62
7TROUBLESHOOTING ........................................................................... 66
[1] Principal Parts................................................................................. 66
[2] BC Controller Disassembly Procedure............................................ 99
[3] Self-diagnosis and Countermeasures Depending on the Check
Code Displayed............................................................................. 104
[4] LED Monitor Display ..................................................................... 121
8PREPARATION, REPAIRSAND REFRIGERANT REFILLING WHEN
REPAIRING LEAKS .............................................................................141
[1] Location of leaks: Extension piping or indoor units (when cooling) ... 141
[2] Location of leaks: Outdoor unit (Cooling mode)............................ 142
[3] Location of leaks: Extension piping or indoor units (Heating mode).. 142
[4] Location of leaks: Outdoor unit (when heating)............................. 143
9CHECK THE COMPOSITION OF THE REFRIGERANT
(PURY-P200·250YMF-C only).................................................................144
–1–

–2–
Safety precautions
Before installation and electric work
Before installing the unit, make sure you read all
the “Safety precautions”.
The “Safety precautions” provide very important
points regarding safety. Make sure you follow
them.
This equipment may not be applicable to
EN61000-3-2: 1995 and EN61000-3-3: 1995.
This equipment may have an adverse effect on
equipment on the same electrical supply system.
Please report to or take consent by the supply
authority before connection to the system.
Symbols used in the text
Warning:
Describes precautions that should be observed to
prevent danger of injury or death to the user.
Caution:
Describes precautions that should be observed to
prevent damage to the unit.
Symbols used in the illustrations
: Indicates an action that must be avoided.
: Indicates that important instructions must be followed.
: Indicates a part which must be grounded.
: Beware of electric shock (This symbol is displayed on the
main unit label.) <Color: Yellow>
Warning:
Carefully read the labels affixed to the main unit.
Warning:
• Use the specified cables for wiring. Make the connections
securely so that the outside force of the cable is not
applied to the terminals.
- Inadequate connection and fastening may generate heat and
cause a fire.
• Have all electric work done by a licensed electrician
according to “Electric Facility Engineering Standard” and
“Interior Wire Regulations”and the instructions given in
this manual and always use a special circuit.
- If the power source capacity is inadequate or electric work is
performed improperly, electric shock and fire may result.
• Securely install the cover of control box and the panel.
- If the cover and panel are not installed properly, dust or water
may enter the outdoor unit and fire or electric shock may
result.
• After completing service work, make sure that refrigerant
gas is not leaking.
- If the refrigerant gas leaks and is exposed to a fan heater,
stove, oven, or other heat source, it may generate noxious
gases.
• Do not reconstruct or change the settings of the protection
devices.
- If the pressure switch, thermal switch, or other protection
device is shorted and operated forcibly, or parts other than
those specified by Mitsubishi Electric are used, fire or
explosion may result.
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11
11
1PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT
Caution
Do not use the existing refrigerant piping.
• The old refrigerant and refrigerator oil in the existing
piping contains a large amount of chlorine which may
cause the refrigerator oil of the new unit to deterio-
rate.
Use refrigerant piping made of phosphorus deoxi-
dized copper and copper alloy seamless pipes and
tubes”. In addition, be sure that the inner and outer
surfaces of the pipes are clean and free of hazardous
sulphur, oxides, dust/dirt, shaving particles, oils,
moisture, or any other contaminant.
• Contaminants on the inside of the refrigerant piping
may cause the refrigerant residual oil to deteriorate.
Storethe piping to beusedduringinstallation indoors
and keep both ends of the piping sealed until just
before brazing. (Store elbows and other joints in a
plastic bag.)
• If dust, dirt, or water enters the refrigerant cycle,
deterioration of the oil and compressor trouble may
result.
Use ester oil, ether oil or alkylbenzene (small
amount) as the refrigerator oil to coat flares and
flange connections.
• The refrigerator oil will degrade if it is mixed with a
large amount of mineral oil.
Use liquid refrigerant to seal the system.
• If gas refrigerant is used to seal the system, the com-
position of the refrigerant in the cylinder will change
and performance may drop.
Do not use a refrigerant other than R407C.
• If another refrigerant (R22, etc.) is used, the chlorine
in the refrigerant may cause the refrigerator oil to de-
teriorate.
Use a vacuum pump with a reverse flow check valve.
• The vacuum pump oil may flow back into the refriger-
ant cycle and cause the refrigerator oil to deteriorate.
Do not use the following tools that have been used
with conventional refrigerants.
(Gauge manifold, charge hose, gas leak detector, re-
verse flow check valve, refrigerant charge base,
vacuum gauge, refrigerant recovery equipment)
• If the conventional refrigerant and refrigerator oil are
mixed in the R407C, the refrigerant may deterio-
rated.
• If water is mixed in the R407C, the refrigerator oil
may deteriorate.
• Since R407C does not contain any chlorine, gas
leak detectors for conventional refrigerants will not
react to it.
Do not use a charging cylinder.
• Using a charging cylinder may cause the refrigerant
to deteriorate.
Be especially careful when managing the tools.
• If dust, dirt, or water gets in the refrigerant cycle, the
refrigerant may deteriorate.
If the refrigerant leaks, recover the refrigerant in the
refrigerant cycle, then recharge the cycle with the
specified amount of the liquid refrigerant indicated
on the air conditioner.
• Since R407C is a nonazeotropic refrigerant, if addi-
tionallycharged whentherefrigerant leaked,the com-
position of the refrigerant in the refrigerant cycle will
change and result in a drop in performance or abnor-
mal stopping.