Mitsubishi FDC121KXZEN1-W Technical Manual page 20

4-5. Heat insulation for prevention of dew condensation
(1) Dress refrigerant pipes (both gas and liquid pipes) for heat insulation and prevention of dew condensation.
Improper heat insulation/anti-dew dressing can result in a water leak or dripping causing damage to household effects, etc.
(2) Use a heat insulating material that can withstand 120℃ or a higher temperature. Poor heat insulating capacity can cause heat insulation problems or cable
deterioration.
All gas pipes must be securely heat insulated in order to prevent damage from dripping water that comes from the condensation formed on them during a cooling
●
operation or personal injury from burns because their surface can reach quite a high temperature due to discharged gas flowing inside during a heating operation.
Wrap indoor units' flare joints with heat insulating parts (pipe cover) for heat insulation (both gas and liquid pipes).
●
Give heat insulation to both gas and liquid side pipes. Bundle a heat insulating material and a pipe tightly together so that no gaps may be left between them and
●
wrap them together with a connecting cable by a dressing tape.
Although it is verified in a test that this air conditioning unit shows satisfactory performance under JIS condensation test conditions, both gas and liquid pipes need
●
to be dressed with 10-20mm heat insulation materials additionally above the ceiling where relative humidity exceeds 70%.
Wires for connecting indoor
and outdoor units
Liquid piping
5. DRAINAGE
Where drain water from the outdoor unit causes problems, implement drain piping with drain elbows
●
and drain grommets.
There are 3 holes in the bottom panel of the outdoor unit to drain condensation.
●
Where condensate is guided to a drain, install the unit on a flat base (an option part supplied separately)
●
or concrete blocks.
Connect a drain elbow as illustrated and plug the other holes with grommets.
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6. ELECTRICAL WIRING WORK
Electrical installation work must be performed by an electrical installation service provider qualified by a power provider of the country.
Electrical installation work must be executed according to the technical standards and other regulations applicable to electrical installations in the country.
Please install an earth leakage breaker without fail. The installation of an earth leakage breaker is compulsory in order to prevent electric shocks or fire accidents.
(Since this unit employs inverter control, please use an impulse withstanding type to prevent an earth leakage breaker's false actuation.)
Please note
a) Use only copper wires.
Do not use any supply cord lighter than one specified in parentheses for each type below.
- braided cord (code designation 60245 IEC 51), if allowed in the relevant part 2;
- ordinary tough rubber sheathed cord (code designation 60245 IEC 53);
- flat twin tinsel cord (code designation 60227 IEC 41)
- ordinary polyvinyl chloride sheathed cord (code designation 60227 IEC 53).
Please do not use anything lighter than polychloroprene sheathed flexible cord (cord designation 60245 IEC57) for supply cords of parts of appliances for outdoor use.
b) Use separate power supplies for the indoor and outdoor units.
c ) The power supplies for indoor units in the same system should turn on and off simultaneously.
d) Ground the unit. Do not connect the grounding wire to a gas pipe, water pipe, lightning rod or telephone grounding wire.
A grounding wire must be connected before connecting the power cable. Provide a grounding wire longer than the power cable.
If improperly grounded, an electric shock or malfunction may result. Don't connect the grounding wire to a gas pipe because it could cause explosion or ignition if gas leaks.
e) The installation of an impulse with standing type earth leakage breaker is necessary. A failure to install an earth leakage breaker can result in an accident such as an
electric shock or a fire. Do not turn on the power until the electrical work is completed. Be sure to turn off the power when servicing.
f ) Please do not use a condensive capacitor for power factor improvement under any circumstances. (It does not improve power factor, while it can cause an abnormal overheat accident)
g) For power supply cables, use conduits.
h) Please do not lay electronic control cables (remote control and signaling lines) and other high current cables together outside the unit. Laying them together can
result in malfunctioning or a failure of the unit due to electric noises.
i ) Power cables and signaling lines must always be connected to the terminal block and secured by cable fastening clamps provided in the unit.
j ) Fasten cables so that they may not touch the piping, etc.
k) When cables are connected, please make sure that all electrical components within the electrical component box are not free or not loose on the terminal
connection and then attach the cover securely. (Improper cover attachment can result in malfunctioning or a failure of the unit, if water penetrates into the box.)
l) Make sure to use circuit breakers (earth leakage breaker and circuit breaker) of proper capacity. Use of breakers of larger capacity could result in trouble on
components or fire accident. The circuit breaker should isolate all poles under over current.
m) Install isolator or disconnect switch on the power supply wiring in accordance with the local codes and regulations. The isolator should be locked in OFF state in
accordance with EN60204-1.
n) After maintenance, all wiring, wiring ties and the like, should be returned to their original state and wiring route, and the necessary clearance from all metal parts
should be secured.
Wiring system diagrams
(The example of combination)
Power source (Outdoor unit side)
Single-phase
220/240V 50Hz
220V 60Hz
Three-phase
380/415V 50Hz
380V 60Hz
Power source (Indoor unit side)
Single-phase
220/240V 50Hz
220V 60Hz
Method of connecting power cables
(1) Method of leading out cables
As shown on the drawing in Section 4-2, cables can be laid through the front, right, left or bottom casing.
●
In wiring on the installation site, cut off a half-blank covering a penetration of the casing with nippers.
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In the case of an installation using a collective drain system, use a port other than the bottom one to take out cables and pipes.
●
If the bottom port is used, seal it thoroughly so that drain water may not spill out.
(2) Notabilia in connecting power cables
Exterior tape
Gas piping
Insulation
Circuit breaker for cabling
Earth leakage breaker
grounding wire
Signal line (for indoor units)
Earth Circuit
leakage breaker
breaker for cabling L
・
N
Indoor unit
〈 〉
grounding wire
Remote control wire
Band (accessory)
Drain elbow (1 piece)
Hard general-purpose PVC pipe available on the market: VP16
L ・ N
or
L1 ・ L2 ・ L3 ・ N
Outdoor unit
Ａ ・ Ｂ
Signal line (between outdoor and indoor units <Ⅰ>)
・ ・ ・
・ ・ ・
Ａ ・ Ｂ Ａ ・ Ｂ
L
・
・ ・ ・
N
Ｘ ・ Ｙ Ｘ ・ Ｙ
〈 〉
Remote
Ｘ ・ Ｙ Ｘ ・ Ｙ
・ ・ ・
control
18
- -
'20 • KX-T-373
Pipe cover (accessory)
Drain grommets
(2 pieces)
Ａ ・ Ｂ
L
CAUTION
・
N
Ｘ ・ Ｙ
If the earth leakage breaker is
exclusively for ground fault protection,
〈 〉
then you will need to install a circuit
breaker for wiring work.
Ｘ ・ Ｙ