Mitsubishi Electric SEZ Series Operating manual

CONTENTS
HWE21010 GB
I SAFETY PRECAUTION
[1] Safety Precaution ..................................................................................................................... 1
1.ALWAYS OBSERVE FOR SAFETY....................................................................................... 1
2.CAUTIONS RELATED TO NEW REFRIGERANT ................................................................. 1
II PART NAMES AND FUNCTIONS
[1] Part Names and Functions ....................................................................................................... 7
III SPECIFICATIONS
[1] Specifications.......................................................................................................................... 15
IV OUTLINES AND DIMENSIONS
[1] Outlines and Dimensions........................................................................................................ 28
V WIRING DIAGRAM
[1] Wiring Diagram ....................................................................................................................... 30
VI REFRIGERANT SYSTEM DIAGRAM
[1] Refrigerant System Diagram ..................................................................................................31
VII TROUBLESHOOTING
[1] Troubleshooting ...................................................................................................................... 32
1.CAUTIONS ON TROUBLESHOOTING................................................................................ 32
2.TROUBLESHOOTING.......................................................................................................... 32
3.MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER .............................. 33
4.SELF-DIAGNOSIS ACTION TABLE..................................................................................... 36
5.TROUBLESHOOTING BY INFERIOR PHENOMENA ........................................................ 40
6.TEST POINT DIAGRAM....................................................................................................... 41
7.TROUBLE CRITERION OF MAIN PARTS ........................................................................... 42
8.DC FAN MOTER (FAN MOTOR/INDOOR CONTROLLER BOARD) .................................. 43
VIII DISASSEMBLY PROCEDURE
[1] Disassembly Procedure.......................................................................................................... 44
1.Control box ........................................................................................................................... 44
2.Thermistor (Intake air) .......................................................................................................... 44
3.Drainpan ............................................................................................................................... 45
4.Thermistor (Condenser / evaporator) (Liquid pipe)............................................................... 46
5.Fan and fan motor ................................................................................................................ 47
6.Bearing [M50·60·71DA(L) model only] ................................................................................. 48
7.Heat exchanger .................................................................................................................... 48
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HWE21010 GB
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[ I SAFETY PRECAUTION ]
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HWE21010 GB
I SAFETY PRECAUTI ON
[1] Safety Precaution
1. ALWAYS OBSERVE FOR SAFETY
2. CAUTIONS RELATED TO NEW REFRIGERANT
MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT
WARNING This mark is for R32 refrigerant only. Refrigerant type is written on nameplate of outdoor unit.
In case that refrigerant type is R32, this unit uses a flammable refrigerant.
If refrigerant leaks and comes in contact with fire or heating part, it will create harmful gas and there is risk of fire.
Read the OPERATION MANUAL carefully before operation.
Service personnel are required to carefully read the OPERATION MANUAL and INSTALLATION MANUAL before operation.
Further information is available in the OPERATION MANUAL, INSTALLATION MANUAL, and the like.
(Risk of fire)
Before obtaining access to terminal, all supply circuits must be disconnected.
Cautions for units utilizing refrigerant R32/R410A
Use new refrigerant pipes.
In case of using the existing pipes for R22, be careful with
the following.
Be sure to clean the pipes and make sure that the insides
of the pipes are clean.
· Change flare nut to the one provided with this product.
Use a newly flared pipe.
· Avoid using thin pipes.
· In case of reconnecting the refrigerant pipes after
detaching, make the flared part of pipe re-fabricated.
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contaminants
such as sulfur, oxides, dirt, shaving particles, etc,
which are hazard to refrigerant cycle.
In addition, use pipes with specified thickness.
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil, etc.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
Store the piping indoors, and keep both ends of
the piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
If large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil, etc.
Charge refrigerant from liquid phase of gas
cylinder.
Use a vacuum pump with a reverse flow check
valve.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil, etc.
Use the following tools specifically designed for
use with R32/R410A refrigerant.
Flare tool
Electronic refrigerant
charging scale
Vacuum pump adaptor
Size adjustment gauge
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools for R32/R410A
The following tools are necessary to use R32/R410A refrigerant.
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigera-
nt will change and the efficiency will be lowered.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the
unit is being used, serviced, or disposed of.
Correct refrigerant is specified on name plate of outdoor
unit.
If other refrigerant (R22, etc.) is used, chlorine in refrige-
rant can cause deterioration of refrigerant oil, etc.
We will not be held responsible for mechanical failure,
system malfunction, unit breakdown or accidents caused
by failure to follow the instructions.
Use the specified refrigerant only.
·
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[ I SAFETY PRECAUTION ]
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HWE21010 GB
[1] Warning for service
(1) Do not alter the unit.
(2) For installation and relocation work, follow the instructions in the Installation Manual and use tools and pipe
components specifically made for use with refrigerant specified in the outdoor unit installation manual.
(3) Ask a dealer or an authorized technician to install, relocate and repair the unit.
(4) This unit should be installed in rooms which exceed the floor space specified in outdoor unit installation manual.
Refer to outdoor unit installation manual.
(5) Install the indoor unit at least 2.5 m above floor or grade level.
For appliances not accessible to the general public.
(6) Refrigerant pipes connection shall be accessible for maintenance purposes.
(7) If the air conditioner is installed in a small room or closed room, measures must be taken to prevent the refriger-
ant concentration in the room from exceeding the safety limit in the event of refrigerant leakage. Should the
refrigerant leak and cause the concentration limit to be exceeded, hazards due to lack of oxygen in the room may
result.
(8) Keep gas-burning appliances, electric heaters, and other fire sources (ignition sources) away from the location
where installation, repair, and other air conditioner work will be performed.
If refrigerant comes into contact with a flame, poisonous gases will be released.
(9) When installing or relocating, or servicing the air conditioner, use only the specified refrigerant written on
outdoor unit to charge the refrigerant lines.
Do not mix it with any other refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high pressure in the refrigerant line, and
may result in an explosion and other hazards.
(10) After installation has been completed, check for refrigerant leaks. If refrigerant leaks into the room and comes
into contact with the flame of a heater or portable cooking range, poisonous gases will be released.
(11) Do not use low temperature solder alloy in case of brazing the refrigerant pipes.
(12) When performing brazing work, be sure to ventilate the room sufficiently. Make sure that there are no hazardous
or flammable materials nearby.
When performing the work in a closed room, small room, or similar location, make sure that there are no refriger-
ant leaks before performing the work.
If refrigerant leaks and accumulates, it may ignite or poisonous gases may be released.
(13) Do not install the unit in places where refrigerant may build-up or places with poor ventilation such as a semib-
asement or a sunken place in outdoor: Refrigerant is heavier than air, and inclined to fall away from the leak
source.
(14) Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manu-
facturer.
(15) The appliance shall be stored in a room without continuously operating ignition sources (for example: open
flames, an operating gas appliance or an operating electric heater).
(16) Do not pierce or burn.
(17) Be aware that refrigerants may not contain an odour.
(18) Pipe-work shall be protected from physical damage.
(19) The installation of pipe-work shall be kept to a minimum.
(20) Compliance with national gas regulations shall be observed.
(21) Keep any required ventilation openings clear of obstruction.
(22) Servicing shall be performed only as recommended by the manufacturer.
(23) The appliance shall be stored in a well-ventilated area where the room size corresponds to the room area as
specified for operation.
(24) Maintenane, service and repair operations shall be performed by authorized technician with required qualifica-
tion.
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
When charging directly from cylinder
(1) Check that cylinder for R32/R410A available on the market is a syphon type.
(2) Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
[2] Cautions for service
[3] Additional refrigerant charge
HWE21010.book 2 ページ ２０２１年６月２４日 木曜日 午前９時０分