Mitsubishi Electric PEH-P400MYA Operating manual

TECHNICAL & SERVICE MANUAL
HEAT PUMP PEH-P400MYA
PEH-P500MYA
Models
AIR-COOLED SPLIT-TYPE
PACKAGED AIR CONDITIONERS
<Indoor unit>
2005
For use with the R407C

Page
Contents
1 PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT .................................... 1
[1] Storage of Piping Material .................................................................................................. 2
[2] Piping Machining ................................................................................................................ 3
[3] Necessary Apparatus and Materials and Notes on Their Handling .................................... 4
[4] Brazing ................................................................................................................................ 5
[5] Airtightness Test.................................................................................................................. 6
[6] Vacuuming .......................................................................................................................... 6
[7] Charging of Refrigerant ......................................................................................................7
2PART NAMES AND FUNCTIONS ............................................................................................ 8
3 SPECIFICATIONS .................................................................................................................. 10
4PART NAMES AND FUNCTIONS .......................................................................................... 12
5ELECTRICAL WIRING DIAGRAM ......................................................................................... 15
6TECHNICAL DATA TO MEET LVD ........................................................................................ 16
[1] Capacity/Input Ratio against Changes in Room Airflow Rate ........................................... 16
[2] Bypass Factor Curves ...................................................................................................... 16
[3] Cooling Sensible Heating Capacity Table ......................................................................... 17
[4] Airflow Characteristic Curves ............................................................................................ 17
[5] Center of Gravity (Indoor unit) .......................................................................................... 18
[6] NC Curve (Indoor unit)...................................................................................................... 19
7SERVICE DATA ...................................................................................................................... 20
[1] Appearance of Equipment ................................................................................................ 20
[2] Internal Construction ......................................................................................................... 21
[3] Refrigerant Circuit ............................................................................................................. 21
8FUNCTION OF SWITCH ON INDOOR CIRCUIT BOARD ..................................................... 22
[1] DIP SW1 for model Selection (DIP SW1 has been set at factory) .................................... 22
[2] DIP SW2 for Capacity Setting (DIP SW2 has been set at factory) ................................... 22
[3] DIP SWE for Emergency Operation.................................................................................. 22
9 TEST RUN .............................................................................................................................. 23
[1] Before test run .................................................................................................................. 23
[2] Test run procedures ..........................................................................................................23
[3] Self-diagnosis ................................................................................................................... 26
[4] Remote controller diagnosis ............................................................................................. 27

¡PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT
Caution
Do not use the existing refrigerant piping.
•Alarge amount of chlorine that may be contained in
the residual refrigerant and refrigerating machine oil
in the existing piping may cause the refrigerating
machine oil in the new unit to deteriorate.
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.
Only use refrigerant R407C.
•The use of other types of refrigerant that contain
chlorine (i.e. R22) may cause the refrigerating
machine oil to deteriorate.
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 R407C. 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 R407C, 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 R407C leak because R407C 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 R407C.
• Infiltration of dust, dirt, or water into the refrigerant
system may cause the refrigerating machine oil to
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-
tionally charged when the refrigerant leaked, the com-
position of the refrigerant in the refrigerant cycle will
change and result in a drop in performance or abnor-
mal stopping.
- 1 -

- 2 -
[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.
OK
OK
NO
NO

- 3 -
[2] Piping Machining
Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator oil to coat flares and 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.

[3] Necessary Apparatus and Materials and Notes on Their Handling
The following tools should be marked as dedicated tools for R407C.
<<Comparison of apparatus and materials used for R407C and for R22>>
Apparatus Used Use R22 R407C
Gauge manifold Evacuating, refrigerant filling Current product
Charging hose Operation check Current product
Charging cylinder Refrigerant charging Current product Do not use
Gas leakage detector Gas leakage check Current product Shared with R134a
Refrigerant collector Refrigerant collection R22 For R407C use only
Refrigerant cylinder Refrigerant filling R22 Identification of dedi-
cated use for R407C:
Record refrigerant
name and put brown
belt on upper part of
cylinder.
Vacuum pump Vacuum drying Current product Can be used by attach-
ing an adapter with a
check valve.
Vacuum pump with a check valve Current product
Flare tool Flaring of pipes Current product
Bender Bending of pipes Current product
Application oil Applied to flared parts Current product Ester oil or Ether oil or
Alkybenzene (Small
amount)
Torque wrench Tightening of flare nuts Current product
Pipe cutter Cutting of pipes Current product
Welder and nitrogen cylinder Welding of pipes Current product
Refrigerant charging meter Refrigerant charging Current product
Vacuum gauge Checking the vacuum degree Current product
Symbols: To be used for R407C only. Can also be used for conventional refrigerants.
Tools for R407C must be handled with more care than those for conventional refrigerants. They must not come into contact
with any water or dirt.
- 4 -

[4] 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 used When 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 nitrogen.
- 5 -

[5] Airtightness Test
No changes from the conventional method. Note that a refrigerant leakage detector for R22 cannot detect R407C leakage.
Halide torch R22 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:
•Aleakage detector for R407C is sold commercially and it should be purchased.
[6] 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 the that 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.
NO NO
- 6 -

[7] 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 attached For a cylinder without a syphon attached
Cylinder color identification R407C-Gray Charged with liquid refrigerant
R410A-Pink
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.
Cylin-
der
Cylin-
der
Valve Valve
Liquid Liquid
- 7 -

Air inlet
Air outlet
Filter
2 PART NAMES AND FUNCTIONS
Indoor unit
• Air inlet : Sucks the ambient air in.
• Filter : The filter bruit into the unit as standard is a
simple filter to remove visible dust and dirt. If
air pulification is one of the conditions required
for use, consult with your dealer.
• Air outlet : Blows the air back out into the room.
Remote controller (PAR-21MAA)
• Once the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.
Operation buttons
- 8 -
PAR-21MAA
ON/OFF
FILTER
CHECK
OPERATION
CLEAR
TEST
TEMP.
MENU
BACK DAY
MONITOR/SET
CLOCK
ON/OFF
Set Temperature buttons
Down
Up
Timer Menu button
(Monitor/Set button)
Mode button
(Return button)
Set Time buttons
Back
Ahead
Timer On/Off button
(Set Day button)
Opening the
door.
ON/OFF button
Fan Speed button
Filter button
(<Enter> button)
Test Run button
Airflow Up/Down button
Louver button
(Operation button)
To preceding
operation number.
Ventilation button
(Operation button)
To next operation
number.
Note:
If you press a button for a feature that is not installed at the indoor unit, the remote controller will display the “Not Available”
message.
If you are using the remote controller to drive multiple indoor units, this message will appear only if the feature is not present
at the parent unit.
Check button
(Clear button)