Mitsubishi Heavy Industries FDT200VSAWPVH Service Manual page 134

④Installation of indoor unit (continued)
Protection of the indoor unit
● If it is not possible to install the panel for a while or if attaching the ceiling board after
installing the indoor unit, protect the indoor unit by using upper carton.
Reinforcing carton
of the inside upper
carton
Caution
● Do not adjust the unit height by adjusting the upper nuts. Doing so will cause unexpected
stress on the indoor unit and cause the unit to become deformed, prevent the panel from
being installed, and be generated fan interference noise.
● Make sure that the indoor unit is installed horizontally and set the appropriate gap between
the underside of the unit and the ceiling plane. Improper installation may cause air leakage,
dew condensation, water leakage and noise.
● Even after the panel has been installed, the unit height can still be finely adjusted. Refer to
the panel installation manual for details.
● Make sure there is no gap between the panel and the ceiling surface, and between the
panel and the indoor unit. Any gap may cause air and/or water to leak, or condensation to
form.
⑤Refrigerant pipe
Caution
●Be sure to use new pipes for the refrigerant pipes. Use the flare nut attached to the product.
Regarding whether existing pipes can be reused or not, and the washing method, refer to the instruction manual of the outdoor
unit, catalogue or technical data.
1) In case of reuse: Do not use old flare nut, but use the nut attached to the unit.
2) In case of reuse: Flare the end of pipe replaced partially for R32 or R410A.
: When flared joints are reused indoors, the flare part shall be re-fabricated. (only for R32)
D
Protruding
Pipe diameter
dimension
d
mm
6.35
Flare die
9.52
12.7
15.88
19.05
●Use phosphorus deoxidized copper alloy seamless pipe (C1220T) for refrigeration pipe installation.
In addition, make sure there is no damage both inside and outside of the pipe, and no harmful
substances such as sulfur, oxide, dust or a contaminant stuck on the pipes.
●Do not use any refrigerant other than the designated refrigerant.
Using other refrigerant except the designated refrigerant, may degrade inside refrigeration oil. And air
getting into refrigeration circuit may cause over-pressure and resultant it may result in bursting, etc.
●Store the copper pipes indoors and seal the both end of them until they are brazed in order to avoid any
dust, dirt or water getting into pipe. Otherwise it will cause degradation of refrigeration oil and
compressor breakdown, etc.
●Use special tools for R32 or R410A refrigerant.
Work procedure
1. Remove the flare nut and blind flanges on the pipe of the indoor unit.
※ Make sure to loosen the flare nut with holding the nut on pipe side with a spanner and giving torque to the
nut with another spanner in order to avoid unexpected stress to the copper pipe, and then remove them.
(Gas may come out at this time, but it is not abnormal.)
● Pay attention whether the flare nut pops out. (as the indoor unit is sometimes pressured.)
2. Make a flare on liquid pipe and gas pipe, and connect the refrigeration pipes on the indoor unit.
※Bend radius of pipe must be 4D or larger. Once a pipe is bent, do not readjust the bending.
Do not twist a pipe or collapse to 2/3D or smaller.
● Make sure to use flare nuts assembled on the unions.
Usage of other flare nuts could cause refrigerant
leakage.
※Do a flare connection as follows:
●Make sure to hold the nut on indoor unit pipe side
using double spanner method as indicated when
fastening / loosening flare nuts in order to prevent
unintentional twisting of the copper pipe.
● When fastening the flare nut, align the refrigeration
pipe with the center of flare nut, screw the nut for 3-4
times by hand and then tighten it by spanner with the
specified torque mentioned in the table above.
3. Cover the flare connection part of the indoor unit with attached insulation material after a gas
leakage inspection, and tighten both ends with attached straps.
● Make sure to insulate both gas pipes and liquid pipes completely.
※ Incomplete insulation may cause dew condensation or water dropping.
● Use heat-resistant (120 °C or more) insulations on the gas side pipes.
● In case of using at high humidity condition, reinforce insulation of refrigerant pipes.
Surface of insulation may cause dew condition or water dropping, if insulations are not
reinfoced.
4. Refrigerant is charged in the outdoor unit.
As for the additional refrigerant charge for the indoor unit and piping, refer to the installation
manual attached to the outdoor unit.
Fix the upper carton by using
panel fixing bolts. The upper
carton has "+" shape slits at
the same position as the
panel fixing pitch.
Protruding dimension for flare, mm
Flare nut
Flare O.D.
Min. pipe
Rigid (Clutch type)
tightening torque
wall thickness D
For R32
mm mm N·m
Conventional tool
For R410A
0.8 8.9 - 9.1 14 - 18
0.8 12.8 - 13.2 34 - 42
0.8 0 - 0.5 0.7 - 1.3 16.2 - 16.6 49 - 61
19.3 - 19.7 68 - 82
1
1.2 23.6 - 24.0 100 - 120
Indoor unit
Spanner
Flare nut
Union
Torque
wrench
⑤Refrigerant pipe (continued)
Caution:
Refrigerating machine oil should not be applied to the threads of union or external surface of flare. It
is because, even if the same tightening torque is applied, the oil is likely to decrease the slide friction
force on the threads and increase, in turn, the axial component force so that it could crack the flare
by the stress corrosion.
Refrigerating machine oil may be applied to the internal surface of flare only.
<
The case of using thicness of insulation is 10mm
Pipe cover (Accessory)
Band (Accessory)
The thckness of insulation is 10mm
⑥Drain pipe
Caution
● Install the drain pipe according to the installation manual in order to drain properly.
Imperfection in draining may cause flood indoors and wetting the household goods,etc.
Do not put the drain pipe directly into the ditch where toxic gas such as sulfur, the other harmful and
●
inflammable gas is generated. Toxic gas would flow into the room and it would cause serious damage to
user's health and safety (some poisoning or deficiency of oxygen). In addition, it may cause corrosion of
heat exchanger and bad smell.
● Connect the pipe securely to avoid water leakage from the joint.
● Insulate the pipe properly to avoid condensation drop.
● Check if the water can flow out properly from both the drain outlet on the indoor unit and the end of the
drain pipe after installation.
● Make sure to make descending slope of greater than 1/100 and do not make up-down bend and/or trap in the
midway. In addition, do not put air vent on the drain pipe. Check if water is drained out properly from the pipe
during commissioning. Also, keep sufficient space for inspection and maintenance.
Work procedure
1. Make sure that the drain hose (the soft PVC side) is inserted into the end of the step part of the
drain socket.
Fix the hose clamp so that its bolt is located on the outside of the indoor unit, and the bolt are
fastened in a vertical orientation.
●Do not apply adhesives on this end.
2. Position the hose clamp so that it touches the insulation of the drain hose, and then tighten the bolt.
3. Turn the bolt several times until it is securely tightened, but do not tighten it excessively.
The step part
Drain hose
Drain socket
Drain socket
Target extent of bolt
tightening should be 17
to 20 mm (Reference:
1.2 to 1.5N ・ m).
17-20 mm
(1.2-1.5N·m)
Hose clamp
4. Prepare a joint for connecting VP25 pipe, adhere and connect the joint to the drain hose (the
rigid PVC side), and adhere and connect VP25 pipe (prepare on site).
※As for drain pipe, apply VP25 made of rigid PVC which is on the market.
● Make sure that the adhesive will not get into the supplied drain hose.
It may cause the flexible part broken after the adhesive is dried up and gets rigid.
● The flexible drain hose is intended to absorb a
small difference at installation of the unit or
drain pipes. Intentional bending, expanding
may cause the flexible hose broken and water
leakage.
●As for drain pipe, apply VP25 (OD32).
If apply PVC25 (OD25), connect the expanded connector to the drain hose, with adhesive.
(Multi unit only)
Indoor side
5. Make sure to make descending slope of greater than 1/100 and do not make up-down bend
and/or trap in the midway.
●Pay attention not to give stress on the pipe on the indoor unit side, and support and fix the pipe
as close place to the unit as possible when connecting the drain pipe.
●Do nt set up air vent.
Supporting metal
1.5m - 2m
Insulation material
Descending slope greater than 1/100
133
- -
'21 • PAC-SM-383
> < >
The case of using reinfoced insulation
Pipe cover (Prepare on site)
Unit
Band (Accessory)
Band (Prepare on site)
Insulation (Prepare on site)
Joint for VP25
(Prepare on site)
Pipe cover (big)[For
insulation] (Accessory)
Joint for VP25
Unit
(Prepare on site)
Drain hose Pipe cover
(For insulation)
(Accessory)
(Prepare on site)
Hose clamp
Drain socket
(Accessory, no adhesive allowed.)
Pipe cover (small)
(For insulation)
(Accessory)
Drain hose
Position the hose clamp so that it touches the insulation of
the drain hose, and securely tighten the bolt.
Do not connect the parts using adhesives.
PVC25 (Prepare on site)
Drain hose
Elbow (Accessory)
(Multi only)
215- 245mm
Trapped air will
No bump
generate noises.
No trap
Air vent
Not touching the water
⑥D
●
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●
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o
o
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Joint for VP25
(Prepare on site)
At
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Drain
●In
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Ma
⑦W
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ele
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3. Re
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4. Ho
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5. Fix
6. Ins
the
Main
Spe
T3.1