Mitsubishi Electric FDF100VSXVD Technical Manual page 75

4) On-site piping work
● Take care so that installed pipes may not touch components within a unit. If touching with an internal
IMPORTANT
component, it will generate abnormal sounds and/or vibrations.
First remove the five screws ( mark) of the service panel and push it down into the direction of the
How to remove the service panel
arrow mark and then remove it by pulling it toward you.
● The pipe can be laid in any of the following directions: side right, front, rear and downward.
● Remove a knock-out plate provided on the pipe penetration to open a minimum necessary area and attach an edging material
supplied as an accessory by cutting it to an appropriate length before laying a pipe.
● Carry out the on site piping work with the operation valve fully closed.
Give sufficient protection to a pipe end (compressed and blazed, or with an adhesive tape) so that water or foreign matters may not
●
enter the piping.
● Bend a pipe to a radius as large as practical.(R100〜R150) Do not bend a pipe repeatedly to correct its form.
● Flare connection is used between the unit and refrigerant pipe. Flare a pipe after engaging a flare nut onto it. Flare dimensions
for R410A are different from those for conventional R407C. Although we recommend the use of flaring tools designed specifically
for R410A, conventional flaring tools can also be used by adjusting the measurement of protrusion B with a protrusion control
gauge.
● The pipe should be anchored every 1.5m or less to isolate the vibration.
Tighten a flare joint securely with a double spanner.
●
Do not apply force beyond proper fastening torque in tightening
CAUTION
the flare nut.
Fix both liquid and gas service valves at the valve main bodies as illustrated
on the right, and then fasten them, applying appropriate fastening torque.
5) Air tightness test
① Although outdoor and indoor units themselves have been tested for air tightness at the factory, check the connecting pipes after the installation work for air tightness from the operation valve's check joint equipped on the
outdoor unit side. While conducting a test, keep the operation valve shut all the time.
a) Raise the pressure to 0.5 MPa, and then stop. Leave it for five minutes to see if the pressure drops.
b) Then raise the pressure to 1.5 MPa, and stop. Leave it for five more minutes to see if the pressure drops.
c) Then raise the pressure to the specified level (4.15 MPa), and record the ambient temperature and the pressure.
d) If no pressure drop is observed with an installation pressurized to the specified level and left for about one day, it is acceptable. When the ambient Temperature fall 1℃, the pressure also fall approximately 0.01 MPa. The
pressure, if changed, should be compensated for.
e) If a pressure drop is observed in checking e) and a) – d), a leak exists somewhere. Find a leak by applying bubble test liquid to welded parts and flare joints and repair it. After repair, conduct an air-tightness test again.
② In conducting an air-tightness test, use nitrogen gas and pressurize the system with nitrogen gas from the gas side. Do not use a medium other than nitrogen gas under any circumstances.
6) Evacuation
＜Work flow＞
When the system has remaining moisture
inside or a leaky point, the vacuum gauge
indicator will rise.
Check the system for a leaky point and
then draw air to create a vacuum again.
7) Additional refrigerant charge
(1) Calculate a required refrigerant charge volume from the following table.
<Single type>
Pipe length for
Item
Standard refrigerant
standard refrigerant
charge volume (kg)
Capacity charge volume (m)
100VN 140VN
2.0
100VS 140VS
0
100VNX 140VNX
2.7
100VSX 140VSX
● A standard refrigerant charge volume means a refrigerant charge volume for an installation with 0m long refrigerant piping.
● This unit contains factory charged refrigerant covering 30m of refrigerant piping and additional refrigerant charge on the installation site is not required for an installation with up to 30m refrigerant piping.
When refrigerant piping exceeds 30m, additionally charge an amount calculated from the pipe length and the above table for the portion in excess of 30m.
When refrigerant piping is shorter than 3m, reduce refrigerant by 1kg from the factory charged volume and adjust to 2.8kg.
●
● If an existing pipe system is used, a required refrigerant charge volume will vary depending on the liquid pipe size. For further information, see "6. UTILIZATION OF EXISTING PIPING."
Formula to calculate the volume of additional refrigerant required
Additional charge volume (kg) = { Main pipe length (m) – Length covered without additional charge 30 (m) } x 0.06 (kg/m) + Total length of branch pipes (m) x 0.06 (kg/m)
● To charge refrigerant again, recover refrigerant from the system first and then charge the volume calculated from the above table (Standard refrigerant charge volume + branch pipes charge volume)
(2) Charging refrigerant
● Since R410A refrigerant must be charged in the liquid phase, you should charge it, keeping the container cylinder upside down or using a refrigerant cylinder equipped with a siphon tube.
Charge refrigerant always from the liquid side service port with the operation valve shut. When you find it difficult to charge a required amount, fully open the outdoor unit valves on both liquid and gas sides and charge refrigerant from the gas (suction)
●
side service port, while running the unit in the cooling mode. In doing so, care must be taken so that refrigerant may be discharged from the cylinder in the liquid phase all the time. When the cylinder valve is throttled down or a dedicated conversion
tool to change liquid-phase refrigerant into mist is used to protect the compressor, however, adjust charge conditions so that refrigerant will gasify upon entering the unit.
● In charging refrigerant, always charge a calculated volume by using a scale to measure the charge volume.
● When refrigerant is charged with the unit being run, complete a charge operation within 30 minutes. Running the unit with an insufficient quantity of refrigerant for a long time can cause a compressor failure.
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.
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.
M4 Screw
Outgoing cable direction
○ As like the refrigerant pipe, it can be let out in any of
Model
the following directions: side right, front, rear and
downward.
100V〜140V
Operation valve size
(mm)
φ6.35 (1/4")
φ9.52 (3/8")
φ12.7 (1/2")
φ15.88 (5/8")
Run the vacuum pump for at least one hour after the vacuum gauge shows
-101kPa or lower. (-755mmHg or lower)
Confirm that the vacuum gauge indicator does not rise even if the system is
left for one hour or more.
Additional charge volume (kg) Installation's pipe length (m)
Refrigerant volume
per meter of refrigerant piping charged for shipment covered without additional
(liquid pipe) at the factory (kg) refrigerant charge
3.8
0.06 30
4.5
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.
Wiring guide
Catch
Catch
Flared pipe end: A (mm)
A
Copper
0
pipe outer Ａ
ー0． 4
diameter
φ6.35
9． 1
φ9.52
13． 2
φ12.7 16.6
φ15.88 19.7
Tightening torque Tightening angle Recommended length
of a tool handle (mm)
(N-m) (° )
14〜18 45〜60 150
Use a torque wrench. If a torque wrench is not available,
34〜42 30〜45 200
fasten the flare nut manually first and then tighten it
49〜61 30〜45 250
further, using the left table as a guide.
68〜82 15〜20 300
Airtighteness test completed
Pay attention to the following points in addition to the above for
Vacuuming begins
the R410A and compatible machines.
○To prevent a different oil from entering, assign dedicated tools, etc. to each
Vacuuming completed
refrigerant type. Under no circumstances must a gauge manifold and a charge
hose in particular be shared with other refrigerant types (R22, R407C, etc.).
Vacuum gauge check
○Use a counterflow prevention adapter to prevent vacuum pump oil from entering
the refrigerant system.
Fill refrigerant
<Twin, triple, W-twin type>
Item
Pipe length for
Standard refrigerant
standard refrigerant
charge volume (kg)
charge volume (m)
Capacity
100VN 140VN
2.0
100VS 140VS
0
100VNX 140VNX
2.7
100VSX 140VSX
*When an additional charge volume calculation result is negative,
it is not necessary to charge refrigerant additionally.
○ 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.)
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
×
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.
- - 74 74 - -
'11 • PAC-T-160
For rear connection
For side right connection
For front connection
For downward connection
Copper pipe protrusion for flaring: B (mm)
Copper
In the case of a rigid (clutch) type
pipe outer
With an R410A tool With a conventional tool
diameter
φ6.35
φ9.52
0〜0.5
φ12.7
φ15.88
Do not hold the valve cap area with a spanner.
Gas side
Outdoor unit operation valve
Check joint
Additional charge volume (kg)
Refrigerant volume Installation's pipe length (m)
per meter of refrigerant piping
charged for shipment covered without additional
(liquid pipe)
at the factory (kg) refrigerant charge
Main pipe Branch pipe
3.8
0.06
4.5
Band (accessory)
Pipe cover (accessory)
Wires for connecting indoor
and outdoor units
Liquid piping
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
Model 100VN ~ 140VN Model 100VS ~ 140VS
100VNX ~ 140VNX 100VSX ~ 140VSX
0.7〜1.3
Indoor unit
30
Exterior tape
Gas piping
insulation
N
Outdoor unit
Indoor unit