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.
–2–
11
1 PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT
11
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 deteriorate.
Use refrigerant piping made of phosphorus deoxidized 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.
Store the piping to be used during installation 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 a vacuum pump with a reverse flow check valve.
• The vacuum pump oil may flow back into the refrigerant 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, reverse 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 deteriorated.
• 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.
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 composition 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 deteriorate.
• 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 additionally charged when the refrigerant leaked, the composition of the refrigerant in the refrigerant cycle will
change and result in a drop in performance or abnormal stopping.
–3–
[1] Storage of Piping Material
(1) Storage location
Store the pipes to be used indoors. (Warehouse at site or owner’s warehouse)
Storing them outdoors may cause dirt, waste, or water to infiltrate.
(2) Pipe sealing before storage
Both ends of the pipes should be sealed until immediately before brazing.
Wrap elbows and T’s in plastic bags for storage.
* The new refrigerator oil is 10 times more hygroscopic than the conventional refrigerator oil (such as Suniso). Water
infiltration in the refrigerant circuit may deteriorate the oil or cause a compressor failure. Piping materials must be
stored with more care than with the conventional refrigerant pipes.
–4–
[2] Piping Machining
Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator oil to coat flange connections.
Use only the necessary minimum quantity of oil !
Reason :
1. The refrigerator oil used for the equipment is highly hygroscopic and may introduce water inside.
Notes :
•Introducing a great quantity of mineral oil into the refrigerant circuit may also cause a compressor failure.
•Do not use oils other than ester oil, ether oil or alkylbenzene.
–5–
[3] Brazing
No changes from the conventional method, but special care is required so that foreign matter (ie. oxide scale, water, dirt,
etc.) does not enter the refrigerant circuit.
Example : Inner state of brazed section
When non-oxide brazing was not usedWhen non-oxide brazing was used
Items to be strictly observed :
1. Do not conduct refrigerant piping work outdoors on a rainy day.
2. Apply non-oxide brazing.
3. Use a brazing material (Bcup-3) which requires no flux when brazing between copper pipes or between a copper pipe
and copper coupling.
4. If installed refrigerant pipes are not immediately connected to the equipment, then braze and seal both ends of them.
Reasons :
1. The new refrigerant oil is 10 times more hygroscopic than the conventional oil. The probability of a machine failure if
water infiltrates is higher than with conventional refrigerant oil.
2. A flux generally contains chlorine. A residual flux in the refrigerant circuit may generate sludge.
Note :
•Commercially available antioxidants may have adverse effects on the equipment due to its residue, etc. When
applying non-oxide brazing, use oxygen free nitrogen (OFN).
–6–
[4] Airtightness Test
No changes from the conventional method. Note that a refrigerant leakage detector for R22 cannot detect R407C
leakage.
Halide torchR22 leakage detector
Items to be strictly observed :
1. Pressurize the equipment with nitrogen up to the design pressure and then judge the equipment’s airtightness, taking
temperature variations into account.
2. When investigating leakage locations using a refrigerant, be sure to use R407C.
3. Ensure that R407C is in a liquid state when charging.
Reasons :
1. Use of oxygen as the pressurized gas may cause an explosion.
2. Charging with R407C gas will lead the composition of the remaining refrigerant in the cylinder to change and this
refrigerant can then not be used.
Note :
•A leakage detector for R407C is sold commercially and it should be purchased.
[5]Vacuuming
1. Vacuum pump with check valve
A vacuum pump with a check valve is required to prevent the vacuum pump oil from flowing back into the refrigerant
circuit when the vacuum pump power is turned off (power failure).
It is also possible to attach a check valve to the actual vacuum pump afterwards.
2. Standard degree of vacuum for the vacuum pump
Use a pump which reaches 0.5 Torr (500 MICRON) or below after 5 minutes of operation.
In addition, be sure to use a vacuum pump that has been properly maintained and oiled using the specified oil. If the
vacuum pump is not properly maintained, the degree of vacuum may be too low.
3. Required accuracy of the vacuum gauge
Use a vacuum gauge that can measure up to 5 Torr. Do not use a general gauge manifold since it cannot measure a
vacuum of 5 Torr.
4. Evacuating time
•Evacuate the equipment for 1 hour after –755 mmHg (5 Torr) has been reached.
•After envacuating, leave the equipment for 1 hour and make sure that the vacuum is not lost.
5. Operating procedure when the vacuum pump is stopped
In order to prevent a backflow of the vacuum pump oil, open the relief valve on the vacuum pump side or loosen the
charge hose to drawn in air before stopping operation.
The same operating procedure should be used when using a vacuum pump with a check valve.
–7–
[6] Charging of Refrigerant
R407C must be in a liquid state when charging, because it is a non-azeotropic refrigerant.
For a cylinder with a syphon attachedFor a cylinder without a syphon attached
Cylin-
Cylin-
der
Cylinder color identificationR407C-GrayCharged with liquid refrigerant
R410A-Pink
Valve
der
Valve
Liquid
Liquid
Reasons :
1. R407C is a mixture of 3 refrigerants, each with a different evaporation temperature. Therefore, if the equipment is
charged with R407C gas, then the refrigerant whose evaporation temperature is closest to the outside temperature is
charged first while the rest of refrigerants remain in the cylinder.
Note :
•In the case of a cylinder with a syphon, liquid R407C is charged without turning the cylinder up side down. Check the
type of cylinder before charging.
[7] Dryer
1. Replace the dryer when the refrigerant circuit is opened (Ex. Change the compressor, full gas leakage). Be sure to
replace the dryer with a CITY MULTI Series Y (For use with R407C).
If any other product is used, the unit will be damaged.
2. Opening the refrigerant circuit after changing to a new dryer is less than 1 hour. The replacement of the dryer should
be the last operation performed.
Circulating configuration (αOC)
LEV inlet
Heat exchanger outlet
16
0.23
26
12
–24–
2 Heating operation
Items
Outdoor unit
PURY-P400YMF-CPURY-P500YMF-C
Ambient temp.
Indoor unit
Condition
Piping
Indoor unit fan notch
Refrigerant volume
Total current
Voltage
Outdoor unit
Indoor unit
BC controller (1, 3)
Oil return (SLEV)
LEV opening
Indoor
Outdoor
Quantity
Quantity in operation
Model
Main pipe
Branch pipe
Total piping length
DB/WB
Set
-
m
-
kg
A
V
Pulse
20.0/-20.0/-
7.0/6.07.0/6.0
55
55
100100100505012512512510025
55
10101010101010101010
5555
HiHiHiHiHiHiHiHiHiHi
27.129.2
25.6/24.3/23.432.1/30.5/29.4
380/400/415380/400/415
600600600450450650650650600350
601400601600
122
High pressure/Low pressure
(after O/S)(before MA)
BC
Pressure
controller
Outdoor
unit
Sectional temperature
High/Intermediate
Discharge (TH11/TH12)
Heat exchanger inlet (TH5)
Accumulator
Suction (Comp) (No.1/No.2)
Low pressure saturation
temperature (TH2)
Liquid level
Shell bottom (Comp No.1/No.2)
CS circuit (TH9)
Circulating configuration (αOC)
Inlet
Outlet
Upper (TH4)
Lower (TH3)
kg/cm2G
(MPa)
°C
21.5/3.621.5/3.2
(2.11/0.35)(2.11/0.31)
20.5/17.520.5/17.5
(2.01/1.72)(2.01/1.72)
88/9388/93
– 3– 1
– 6– 7
– 6– 7
– 5/2– 5/0
– 10
30
– 6
43/4540/33
5
0.28
Indoor
unit
Heat exchanger inlet
LEV inlet
81
34
–25–
[5] Function of Dip SW and Rotary SW
(1) Outdoor unit
PURY-P400·500YMF-C.
1 Variable capacity unit
MAIN board
SwitchFunction
SWU 1 ~ 2
SW1
SW2
SW3
SW4
Unit Address Setting
For self diagnosis/
1 ~ 8
operation monitoring
9 ~ 10
Centralized Control
1
Switch
Deletion of connection
2
information.
Deletion of error history.
3
• Adjustment of Refriger-
4
ant Volume
• Ignore liquid level errors
5
6
Forced defrosting
7
8
Reset of the time the CS
9
circuit is closed.
10
SW3-2 Function Valid/
1
Invalid
Indoor Unit Test Operation
2
Defrosting start tempera-
3
ture .
Defrosting end tempera-
4
ture.
Target low-pressure
5
change
Pump Down Function
6
Target high-pressure
7
change
8
9
10
SW4-2 Function valid/
1
Invalid
Configuration compensa-
2
tion value
3
4
5
6
7
8
9
10
Models
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Function According to Switch OperationSwitch Set Timing
When OffWhen OnWhen OffWhen On
Set on 51 ~ 100 with the rotary switch.*2
Centralized control not
connected.
Storing of refrigeration
system connection
information.
Store IC•OC error history.
Ordinary control
Ordinary control
When the CS circuit is
closed, that time is totaled.
SW3-2 Function Invalid
Stop all indoor units.
– 8°C
7°C
Ordinary control
Ordinary control
Ordinary control
Model 400
SW4-2 Function invalid
Changes as shown below by on → off change
0 %→3 %→6 %→9 %→12 %→ – 6 %→ – 3 %→0 %
Before power is turned on.
Refer to LED monitor display on the outdoor board.
Centralized control
connected.
Deletion of refrigeration
system connection
information.
Erase IC•OC error history .
• Refrigerant volume
adjustment operation.
• Ignore liquid level errors
-
Start forced defrosting.
Timer Reset
SW3-2 Function Valid
All indoor units test run
ON.
2deg lower than normal
Pump Down Operation
High pressure / 1.5 ~ 2.5 K
higher than normal
-
-
SW4-2 Function valid
-
-
-
-
-
-
-
-
-
-
-
-
-
– 10°C
12°C
-
-
Model 500
-
-
-
-
-
-
-
-
Before power is turned on.
Before power is turned on.
During normal operation when
power is on.
During normal
operation when
power is on.
During normal
operation when
power is on.
During normal operation when
power is on.
During normal operation when
power is on.
When SW3-1 is ON after power is
turned on.
During normal operation when
power is on.
During normal operation when
power is on. (Except during
defrosting)
During normal operation when
power is on.
While the compressor is stopped.
During normal operation when
power is on.
When switching on the power.
When switching on the power.
When SW4-1 is ON
-
Invalid 2 hours
after compressor
starts.
-
10 minutes or
more after
compressor
starts.
-
-
-
-
-
-
-
-
-
-
-
-
Note 1: Factory setting is SWU 1 to 2 = 00, SW3 - 10 = set by model. All other switches are set to OFF.
Note 2: If the address is set from 01 to 50, it automatically becomes 100.
–26–
(2) Indoor unit
DIP SW1, 3
SwitchSW name
Room temp. sensor position
1
Clogged filter detect.
2
Filter duration
3
OA intake
4
Remote display select.
5
SW1
SW3
Humidifier control
6
Heating thermo. OFF airflow
7
Heating thermo. OFF airflow
8
Power failure automatic
9
return
Power source start/stop
10
Model selection
1
2
Louver
3
Vane
4
Vane swing function
5
Vane horizontal angle
6
Vane angle set for cooling
Cooling capacity saving
for PKFY-P. VAM,
effective/ineffective
7
8
Heating 4deg up
9
10
Operation by SW
OFFONOFFON
Indoor unit inlet
None
100h
Ineffective
Fan output display
At stationary heating
Very low speed
SW1-7 setting
Ineffective
Ineffective
Heat pump
None
None
None
1st setting
Down blow B, C
–
–
Effective
–
–
–
–
Built in remote controller
Provided
2500h
Effective
Thermo. ON signal display
Always at heat.
Low speed
Set airflow
Effective
Effective
Cool.only
Provided
Provided
Provided
2nd setting
Horizontal
–
Ineffective
–
–
Switch set timing
At unit stopping
(at remote
controller OFF)
Remarks
Always ineffective for PKFY-P.VAM
Not provided for PKFY-P.VAM
Provided for PLFY-P.VGM (ON) setting
Always down blow B,C for PKFY-P.VAM
Horizontal (ON) setting for PLFY-P.VLMD
Ineffective (ON) setting for floor
standing
Note 1: The shaded part indicates the setting at factory shipment. (For the SW not being shaded, refer to the
table below.)
Switch
SW1
SW3
Model
3
6
7
3
4
6
8
VBM-A
OFF
OFF
ON
OFF
PLFY-P
VLMD-A
ON
OFF
ON
OFFONON
VKM-A
VML-A VMH-A
OFFON
ON
OFF
PEFY-P
20~80VMM-A
OFF
ON
OFFON
PDFY-P
100~140VMM-A
OFF
OFF
OFF
VM-A
ON
PFFY-PPCFY-P
VLRM-A, VLEM-A
OFF
OFF
ONOFF
PKFY-P
VGM-AONVAM-A VGM-A
OFF
OFF
ON
ONOFFON
Note 2: The DipSW setting is only effective during unit stopping (remote controller OFF) for SW1, 2, 3 and 4 commonly
and the power source is not required to reset.)
3: When both SW1-7 and SW1-8 are being set to ON, the fan stops at the heating thermostat of OFF.
Setting of DIP SW2
Model P20 P25P32P40 P50 P63
Capacity (model name) code