Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual page 241

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
100VN
Single phase 3 wire
125VN
140VN
100VS
125VS
140VS
With a conventional tool
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.
As indicated in the table shown on the right, pressure detected at each point will vary
depending on whether a cooling or heating operation has been selected.
3) Setting SW3-1, SW3-2, on-site
(1) Defrost control switching (SW3-1)
・ When this switch is turned ON, the unit will run in the defrost mode more frequently.
・ Set this switch to ON, when installed in a region where outdoor temperature falls below zero during the season the unit is run for a
heating operation.
(2) Snow guard fan control (SW3-2)
・ When this switch is turned on, the outdoor unit fan will run for 10 seconds in every 10 minutes, when outdoor temperature falls to 3℃ or
lower and the compressor is not running.
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 source Power cable thickness(mm ) MAX. over current (A) Cable length (m) Grounding wire thickness
2
220-240V 50Hz 5.5 24 25
220V 60Hz
3 phase 4 wire
380-415V 50Hz 3.5 15 27
380V 60Hz
●
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
Hard vinyl chloride pipe for general purpose (VP-16)
( 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.
○
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
VCT cabtyre cable VVF flat cable
to prevent a faulty operation.
×
4-core cable Shield cable
※
At the connection with the duct type indoor unit.
Indoor-outdoor wire thickness × number
Model Power source
100VN
Single phase 3 wire
220-240V 50Hz
125VN
220V 60Hz
140VN
φ1.6mm x 3
φ1.6mm
100VS 3 phase 4 wire
380-415V 50Hz
125VS
380V 60Hz
140VS
●
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.
●
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.
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
Charge port of the
Check joint of the pipe
gas operation valve
Cooling Discharge pressure Suction pressure
operation (High pressure) (Low pressure)
Suction pressure Discharge pressure
Heating
(Low pressure) (High pressure)
operation
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
(Harmonic resistant type)
Switchgear or Circuit breaker
L1 N
Outdoor unit
1 2/N 3
1 2/N 3
Indoor unit
X Y Z
X Y Z
Remote control
Model 100VN ~ 140VN
Power cable thickness (mm ) MAX. over current (A) Cable length (m) Grounding wire thickness
2
25 24
5.5
27 22
8 28 32
φ1.6mm
16 26
3.5 18 23
19 21
A failure to observe these instructions can result in a compressor breakdown.
When you leave the outdoor unit with power supplied to it,
●
Items to checkbefore a test run
be sure to close the panel.
Item No.used in the
Item Check item
installation manual
If brazed, was it brazed under a nitrogen gas flow?
Were air-tightness test and vacuum extraction surely performed?
Refrigerant
2
Are heat insulation materials installed on both liquid and gas pipes?
plumbing
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?
4
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?
Is indoor unit installation work completed?
ー
Indoor unit
Where a face cover should be attached onto an indoor unit, is the face cover attached to the indoor unit?
Test run procedure ● Always carry out a test run and check the following in order as listed.
Turn The contents of operation
①
Open the gas side operation valve fully.
②
Open the liquid side operation valve fully.
③
Close the panel.
④
Where a remote control unit is used for unit setup on the installation site, follow instructions for unit setup on the installation site with a remote control unit.
SW3-3 ON / SW3-4 OFF: the unit will start a cooling operation.
Earth leakage breaker
(Harmonic resistant type)
Switchgear or Circuit breaker
L1 L2 L3 N
Outdoor unit
1 2/N 3
1 2/N 3
Indoor unit
X Y Z
X Y Z
Remote control
PSB012D923N
Model 100VS ~ 140VS
Indoor-outdoor wire thickness × number
φ1.6mm x 3
Check
Check
Does the existing pipe s
(1) The pipe length is 50
(2) The pipe size conform
(3) The elevation differe
conforms to the follo
Where the outdoor
Where the outdoor
Is the unit to install in
twin-triple-double-twi
Is the existing pipe syste
Is the existing pipe sys
(Check whether refrige
the system before)
Are there any branch p
Are heat insulation mat
reuse free of peel-offs
(Heat insulation is nece
Aren't there any loose p
No loose pipe s
The existing p
<Where
WARNING
Carry out
(1) Run
(2) Stop
(3) Clos
(4) Blow
wash
●
F
P
●
T
<Where
Wash th
●
If you