Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual page 72

- 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
20 mm or thicker heat insulation materials above the ceiling where relative humidity exceeds 70%.
3. DRAIN PIPING WORK
●
Execute drain piping by using a drain elbow and drain grommets supplied separately as
optional parts, where water drained from the outdoor unit is a problem.
4. 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.
Do not use any supply cord lighter than one specified in parentheses for each type below.
●
- braided cord (code designation 60245 IEC 51),
- ordinary tough rubber sheathed cord (code designation 60245 IEC 53)
- flat twin tinsel cord (code designation 60227 IEC 41);
Do not use anything lighter than polychloroprene sheathed flexible cord (code designation 60245 IEC57) for supply cords of parts of appliances for outdoor use.
Ground the unit. Do not connect the grounding wire to a gas pipe, water pipe, lightning rod or telephone grounding wire.
●
If impropery grounded, an electric shock or malfunction may result.
A grounding wire must be connected before connecting the power cable. Provide a grounding wire longer than the power cable.
●
The installation of an impulse withstanding type earth leakage breaker is necessary. A failure to install an earth leakage breaker can result in an acccident such as
●
an electric shock or a fire.
Do not turn on the power until the electrical work is completeted .
●
Do not use a condensive capacitor for power factor improvement under any circumstances. (It dose not improve power factor, while it can cause an abnormal
●
overheat accident)
For power supply cables, use conduits.
●
Do not lay electronic control cables (remote control and signaling wires) and other cables together outside the unit. Laying them together can result in the
●
malfunctioning or a failure of the unit due to electric noises.
Fasten cables so that may not touch the piping, etc.
●
When cables are connected, make sure that all electrical components within the electrical component box are free of loose connector coupling or 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.)
Always use a three-core cable for an indoor-outdoor connecting cable. Never use a shield cable.
●
Power cable, indoor-outdoor connecting wires
●
Always perform grounding system installation work with the power cord unplugged.
Always use an earth leakage circuit breaker designed for inverter circuits to prevent a faulty operation.
CAUTION
Earth leakage breaker
(Harmonic resistant type)
Model
Switchgear or Circuit breaker
L1 N
71V
Outdoor unit
1 2/N 3
●
The specifications shown in the above table are for units without heaters. For units with heaters, refer to the installation instructions or the construction
1 2/N 3 instructions of the indoor unit.
Indoor unit ●
Switchgear or Circuit breaker capacity which is calculated from MAX. over current should be chosen along the regulations in each country.
X Y Z ●
The cable specifications are based on the assumption that a metal or plastic conduit is used with no more than three cables contained in a conduit and a
voltage drop is 2%. For an installation falling outside of these conditions, follow the internal cabling regulations. Adapt it to the regulation in effect in each
X Y Z
Remote control country.
Drain elbow ( 1 pe.)
Hard vinyl chloride pipe for general purpose (VP-16)
For details of electrical cabling, refer to the indoor unit installation manual.
Power cable
MAX. over
Cable length
Power source thickness
current
(m)
(mm 2 ) (A)
Single phase 3 wire
220-240V
3.5 17 21
50Hz
○
There are 3 drain holes provided on the bottom plate of an outdoor unit to discharge
condensed water.
○
When condensed water needs to be led to a drain, etc., install the unit on a flat base
(supplied separately as an optional part) or concrete blocks.
○
Connect a drain elbow as shown in the illustration and close the other two drain holes with
grommets.
Drain grommet
( 2 pes.)
○
VCT cabtyre cable
● Connect a pair bearing a common terminal number with an indoor-outdoor connecting wire.
● In cabling, fasten cables securely with cable clamps so that no external force may work on
terminal connections.
● Grounding terminals are provided in the control box.
Indoor-outdoor
Grounding wire
wire thickness
thickness x
number
φ1.6mm φ1.6mm x 3
Wires for connecting indoor
Exterior tape
and outdoor units
Gas piping
Liquid piping
insulation
×
VVF flat cable 4-core cable Shield cable
Power source, signal line and ground terminal block
Grounding terminal
○ Do not connect to the grounding wire from another unit,
but install a dedicated wire up to the grounding wire from
the distribution board.
Wiring clamp
○ Fasten cables and protect the terminal connections from
external force.
Wiring diagram
○ It is attached on the back side of the service panel.
E34
E40
E49
●
If an error cod
5) The state o
The following tabl
Valve for a cooling o
Valve for a heating o
6) Heed the fo
This outdoor unit
compressor from l
6. UTILIZATI
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(2) The p
(3) The e
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WARNING
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