Mitsubishi Heavy Industries FDT200VSAWPVH Service Manual page 168

4) Refrigerant pipe wall thickness and material
● Select refrigerant pipes of the table shown on the right wall thickness and material as
specified for each pipe size.
This unit uses R32. Always use 1/2H pipes having a 1.0mm or thicker wall for φ19.05 or
●
larger pipes, because O-type pipes do not meet the pressure resistance requirement.
5) 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 screws (
How to remove the service panel
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.
※
Please close the gap of piping connecting part with putty or insulation material (locally procured) after piping connection. Small animals
or insects may intrude into the outdoor unit and it will cause electrical short.
●
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 R32 are different from those for conventional R22 and R407C. Although we recommend the use of flaring tools designed
specifically for R32, conventional flaring tools can also be used by adjusting the measurement of protrusion B with a protrusion
control gauge.
※
Do not reuse existing flare, make new flare.
●
The pipe should be anchored every 1.5m or less to isolate the vibration.
● Tighten a flare joint securely with a double spanner.
CAUTION
●
Do not apply force beyond proper fastening torque in tightening 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.
●
Do not apply refrigerating machine oil to the flared surface. It can cause refrigerant leakage.
6) 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 service valve's check joint equipped on the outdoor
unit side. While conducting a test, keep the service 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.
7) 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.
8) Additional refrigerant charge
(1) Determine if the factory refrigerant charge of the outdoor unit is sufficient to cover the total liquid piping length.
Item
Factory refrigerant charge (kg)
Capacity
200V 4.3
250V 5.1
280V 5.6
(2) If the factory charge does not cover the total liquid piping length, an addition of refrigerant is necessary.
Step1 - Calculate the total equivalent length, Le:
[Formula to calculate equivalent length (Le)]
Le = (length of φ12.7) + 0.52 × (length of φ9.52)
In case of new piping
Le = (length of φ12.7) + 0.52 × (length of φ9.52) + 1.56 × (length of φ15.88)
In case of existing piping
(3) Charging refrigerant
●
Charge refrigerant always from the liquid side service port with the service 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 label attached on the back side of the service panel.
9) 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.
- 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 option al parts, where water drained from the outdoor unit is a
problem.
Water may drip where there is a larger amount of drain water. Seal around the drain
●
elbow and drain grommets with putty or adequate caulking material.
Condensed water may flow out from vicinity of service valve or connected pipes.
●
Where you are likely to have several days of sub-zero temperatures in a row, do not
●
use a drain elbow and drain grommets. (There is a risk of drain water freezing
inside and blocking the drain.)
Do not use drain elbow and grommet made of plastic for drain piping when base
●
heater for outdoor unit is used. Plastic grommet and elbow will be damaged and
burnt in worst case.
Prepare another drain tray made of metallic material for collecting drain when base
●
heater is used.
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 .
Pipe diameter
[mm]
Minimum pipe wall thickness
Pipe material*
*Phosphorus deoxidized seamless copper pipe C1220T, JIS Ｈ3300
mark) of the service panel and push it down into the direction of the arrow
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.
Liquid piping length covered with factory
refrigerant charge (m)
30
Grommet
Drain elbow
For details of electrical cabling, refer to the indoor unit installation manual.
Power supply, 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 guide
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. Models 200V, 250V, 280V
6.35 9.52 12.7 15.88
[mm] 0.8 0.8 0.8 1.0
O-type pipe O-type pipe O-type pipe O-type pipe
Catch
For front connection
Flared pipe end: A (mm)
A
Copper
0
Ａ
pipe outer
ー0． 4
diameter
φ6.35
9． 1
φ9.52
13． 2
φ12.7
16.6
φ15.88
19.7
Operation valve size Tightening torque
(mm) (N m)
Do not hold the valve cap area with a spanner.
φ6.35 (1/4")
14ー18
φ9.52 (3/8")
34ー42
φ12.7 (1/2")
49ー61
φ15.88 (5/8")
68ー82
φ19.05 (3/4")
100ー130
Airtighteness test completed
Pay attention to the following points in addition to the above for
the R32 and compatible machines.
Vacuuming begins
○To prevent a different oil from entering, assign dedicated tools, etc. to each
refrigerant type. Under no circumstances must a gauge manifold and a charge
Vacuuming completed
hose in particular be shared with other refrigerant types (R22, R407C, R410A
etc.).
Vacuum gauge check
○Use a counterflow prevention adapter to prevent vacuum pump oil from entering
the refrigerant system.
Fill refrigerant
Step2 - Determine from the table below the additional refrigerant charge:
*
Model FDC200
≦ 30 m
Additional refrigerant charge (kg) 0kg
Model FDC250
≦ 30 m
Additional refrigerant charge (kg) 0kg
Model FDC280
≦ 30 m
Additional refrigerant charge (kg) 0kg
*For FDC200VSA-W only, even if the total liquid piping length > 30m, there may be cases where additional refrigerant charge is not required.
●
It is not necessary to remove or add refrigerant charge even if the total liquid piping length is less than 3 m.
●
If an existing pipe system is used, the refrigerant charge will vary according to the liquid pipe size. For further information,
see "6. UTILIZATION OF EXISTING PIPING."
Examples:
φ
FDC250VSA-W - W-twin system with L( 12.7) = 35 m; La(
Total liquid piping length = 57 m, additional refrigerant charge is necessary
Step 1: Le = 35 + 0.52 x (5 + 5 + 3 + 3 + 3 + 3) = 46.44 m Step 2: additional refrigerant charge = 1.31 kg
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.
Then, please secure space for the drain elbow and the drain hose.
Grommet
Drain hose
(To be procured on the installer's part)
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. Separate grounding wire from indoor - outdoor connecting wire.
●
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 breaker designed
CAUTION
for inverter circuits to prevent a faulty operation.
167
- -
'21 • PAC-SM-383
NOTE
22.22 25.4 28.58
1.0 1.0 1.0 ● Select pipes having a wall thickness larger
than the specified minimum pipe thickness.
1/2H-type pipe 1/2H-type pipe 1/2H-type pipe
For rear connection
For side right connection
For downward connection
Copper pipe protrusion for flaring: B (mm)
Copper
In the case of a rigid (clutch) type
pipe outer
diameter With an R32 tool
φ6.35
φ9.52
0〜0.5
φ12.7
φ15.88
Use a torque wrench
Outdoor unit
Equivalent length (Le)
30＜Le ≦ 40 m 40＜Le ≦ 50 m 50＜Le ≦ 60 m
0.20kg 2.11kg 2.98kg
Equivalent length (Le)
30＜Le ≦ 40 m 40＜Le ≦ 50 m 50＜Le ≦ 60 m
0.44kg 1.31kg 2.18kg
Equivalent length (Le)
30＜Le ≦ 40 m 40＜Le ≦ 50 m 50＜Le ≦ 55 m
0.44kg 1.31kg 1.96kg
φ φ φ φ
9.52) = Lb( 9.52) = 5 m; L1( 9.52) = L2( 9.52) = L3(
Band (accessory)
Wires for connecting indoor
and outdoor units
Liquid piping
Clearance
Earth leakage breaker
(Harmonic resistant type)
Switchgear or circuit breaker
L1 L2 L3
1 2/N 3
1 2/N
X Y
X Y
Models 200V, 250V, 280V
※
In cas
Putty or insulation
(local procurement)
5. COM
With a conventional tool
0.7〜1.3
Hold the hexagon part
of the main body
1) Te
Gas side
service valve Indoor unit
Check joint
2) Ch
3) Se
60＜Le ≦ 70 m
4) Fa
3.65kg
60＜Le ≦ 70 m
2.85kg
55＜Le ≦ 60 m
2.35kg
5) Th
φ φ
9.52) = L4( 9.52) = 3 m
6) He
Pipe cover (accessory)
6. UTI
Check w
Exterior tape
Gas piping
Insulation
N
Outdoor unit
3
Indoor unit
Remote control
W
CA
(1) A
s
(2) S
(3) Th
(4) D
Use
unit
As in
depe
(1) D
・
・
(2) S
・ W
l
・ W
Error
remo
●
If
The
Valve
Valve
・ Thi
in
・ At
liqu
WA