Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual page 80

NOTE
Put down the refrigerant volume calculated from the pipe length onto the caution label attached on the back side of the service panel.
8) Heating and condensation prevention
(1) Dress refrigerant pipes (both gas and liquid pipes) for heat insulation and prevention of dew condensation.
(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.
- Improper heat insulation/anti-dew dressing can result in a water leak or dripping causing damage to household effects, etc.
- 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.
M4 Screw
Model
100V〜140V
Model Power source
100VN～140VN
Single phase 3 wire
100VNX
220-240V 50Hz
220V 60Hz
125VNX,140VNX
100VS～140VS
3 phase 4 wire
380V 50Hz
100VSX～140VSX
● The specifications shown in the above table are for units without heaters. For units with heaters, refer to the installation instructions or the construction
instructions of the indoor unit.
●
With a conventional tool Switchgear or Circuit breaker capacity which is calculated from MAX. over current should be chosen along the regulations in each country.
● 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
country.
0.7〜1.3
5. TEST RUN
WARNING
CAUTION
Gas side
operation valve Indoor unit
Check joint
1) Test run method
(1) A test run can be initiated from an outdoor unit by using SW3-3 and SW3-4 for on-site
setting.
(2) Switching SW3-3 to ON will start the compressor.
(3) The unit will start a cooling operation, when SW3-4 is OFF, or a heating operation, when SW3-4 is ON.
(4) Do not fail to switch SW3-3 to OFF when a test run is completed.
2) Checking the state of the unit in operation
Use check joints provided on the piping before and after the four-way valve installed inside the outdoor
unit for checking discharge pressure and suction pressure.
Hard vinyl chloride pipe for general purpose (VP-16)
For details of electrical cabling, refer to the indoor unit installation manual.
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 connection
from external force.
Wiring diagram
○
It is attached on the back side of the service panel.
Outgoing cable direction
○
As like the refrigerant pipe, it can be let out in any of
the following directions: side right, front, rear and
downward.
Power cable thickness(mm 2 ) MAX. over current (A) Cable length (m) Grounding wire thickness
24 25
5.5
φ1.6mm
26 23
3.5 15 27
●
Before conduct a test run, do not fail to make sure that the operation valves are closed.
●
Turn on power 6 hours prior to a test run to energize the crank case heater.
●
In case of the first operation after turning on power, even if the unit does not move for 30 minutes, it is not a breakdown.
●
Always give a 3-minute or longer interval before you start the unit again whenever it is stopped.
●
Removing the service panel will expose high-voltage live parts and high-temperature parts, which are quite dangerous.
Take utmost care not to incur an electric shock or burns. Do not leave the unit with the service panel open.
●
When you operate switches (SW3, SW5) for on-site setting, be careful not to touch a live part.
● You cannot check discharge pressure from the liquid operation valve charge port.
●
The 4-way valve (20S) is energized during a heating operation.
●
When power supply is cut off to reset the unit, give 3 or more minutes before you turn on power again after power is cut
off. If this procedure is not observed in turning on power again, "Communication error between outdoor and indoor unit"
may occur.
○
○
○
Drain elbow ( 1 pe.)
Drain grommet
( 2 pes.)
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.
●
● 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.
○
VCT cabtyre cable × VVF flat cable
Wiring guide
4-core cable 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
CAUTION
breaker designed for inverter circuits
to prevent a faulty operation.
※
At the connection with the duct type indoor unit.
Indoor-outdoor wire thickness × number
Model Power source Power cable thickness(mm
100VN,100VNX
5.5
125VN
Single phase 3 wire
φ1.6mm x 3
140VN
220-240V 50Hz
220V 60Hz
125VNX
140VNX
100VS,100VSX
3 phase 4 wire
125VS,125VSX 380-415V 50Hz
3.5
380V 60Hz
140VS,140VSX
A failure to observe these instructions can result in a compressor breakdown.
Items to checkbefore a test run
Item No.used in the
installation manual
2
SW-3-3 SW-3-4
OFF
Cooling during a test run
ON
ON
Heating during a test run
OFF - - - - Normal or After the test operation
4
Charge port of the
Check joint of the pipe
gas operation valve
Cooling Discharge pressure Suction pressure
operation
Pipe cover (accessory)
Wires for connecting indoor
and outdoor units
Liquid piping
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.
Earth leakage breaker Earth leakage breaker
(Harmonic resistant type) (Harmonic resistant type)
Switchgear or Circuit breaker Switchgear or Circuit breaker
L1 N L1 L2 L3
Outdoor unit
1 2/N 3 1 2/N 3
1 2/N 3 1 2/N 3
Indoor unit
X Y X Y
X Y X Y
Remote controller Remote controller
PSB012D955F
Model 100VN ~ 140VN Model 100VS ~ 140VS
100VNX ~ 140VNX 100VSX ~ 140VSX
Indoor-outdoor wire thickness × number
2 ) MAX. over current (A) Cable length (m) Grounding wire thickness
25 24
27 22
28 32
8 29 31
φ1.6mm φ1.6mm x 3
30 30
16 26
18 23
19 21
● When you leave the outdoor unit with power supplied to it,
be sure to close the panel.
Item Check item
If brazed, was it brazed under a nitrogen gas flow?
Were air-tightness test and vacuum extraction surely performed?
Refrigerant
plumbing Are heat insulation materials installed on both liquid and gas pipes?
Are operation valves surely opened for both liquid and gas systems?
Have you recorded the additional refrigerant charge volume and refrigerant pipe length on the panel's label?
Is the unit free of cabling errors such as uncompleted connection, an absent or reversed phase?
Are properly rated electrical equipments used for circuit breakers and cables?
Doesn't cabling cross-connect between units, where more than one unit are installed?
Aren't indoor-outdoor signal wires connected to remote control wires?
Electric
Do indoor-outdoor connecting cables connect between the same terminal numbers?
wiring
Are either VCT cabtyre cables or WF flat cables used for indoor-outdoor connecting cables?
Does grounding satisfy the D type grounding (type III grounding) requirements?
Is the unit grounded with a dedicated grounding wire not connected to another unit's grounding wire?
Are cables free of loose screws at their connection points?
Are cables held down with cable clamps so that no external force works onto terminal connections?
This outdoor unit may start in the standby m
level in the compressor from lowering on the
6. UTILIZATION OF EX
Exterior tape
Check whether an existing pipe system is reusable or
Gas piping
Are an outdoor unit and an indoor unit connected to
insulation
existing pipe system to reuse?
Are the existing units our products?
Does the existing pipe system to reuse satisfy all of th
(1) The pipe length is 50m or less.
(2) The pipe size conforms to the table of pipe size res
(3) The elevation difference between the indoor and ou
conforms to the following restrictions.
Where the outdoor unit is above: 30m or less
Where the outdoor unit is below: 15m or less
Is the unit to install in the existing pipe system a
twin-triple-double-twin model?
Is the existing pipe system to reuse free of corrosion, flaw
Is the existing pipe system to reuse free of gas leaks?
(Check whether refrigerant charge was required freq
the system before)
Are there any branch pipes with no indoor unit conne
Are heat insulation materials of the existing pipe syst
reuse free of peel-offs or deterioration?
(Heat insulation is necessary for both gas and liquid p
Aren't there any loose pipe supports?
No loose pipe supports
The existing pipe system is reus
<Where the existing unit
WARNING
Carry out the following steps
N
(1) Run the unit for 30 minute
Outdoor unit
(2) Stop the indoor fan and ru
(3) Close the liquid side opera
(4) Blow with nitrogen gas. ※
Indoor unit
<Where the existing unit
Wash the pipe system or inst
●
If you choose to wash the
Check
START
YES
YES
YES
NO
NO
NO
NO
NO
wash the pipe system or i
●
For the flare nut, do no
Process a flare to the d
● Turn on-site setting sw