Mitsubishi Heavy Industries SCM71ZM-S1 Technical Manual page 105

Installation of indoor unit (continued)
④
6. Make sure to install the indoor unit horizontally. Confirm the
levelness of the indoor unit with a level gauge or transparent
hose filled with water. Keep the height difference at both ends of
the indoor unit within 3mm.
7. Tighten four upper nuts and fix the unit after height and levelness
adjustment.
Caution
 Do not adjust the height by adjusting upper nuts. It will cause unexpected stress on the indoor unit
and it will lead to deformation of the unit, failure of attaching a panel, and generating noise from the
fan.
 Make sure to install the indoor unit horizontally and set the gap between the unit underside and
the ceiling plane properly. Improper installation may cause air leakage, dew condensation, water
leakage and noise.
 Even after decorative panel attached, still the unit height can be adjusted finely. Refer to the
installation manual for decorative panel for details.
 Make sure there is no gap between decoration panel and ceiling surface, and between decoration
panel and the indoor unit. The gap may cause air leakage, dew condensation and water leakage.
 In case decorative panel is not installed at the same time, or ceiling material is installed after the
unit installed, put the cardboard template for installation attached on the package (packing material
of cardboard box) on the bottom of the unit in order to avoid dust coming into the indoor unit.
Refrigerant pipe
⑤
Caution
Be sure to use new pipes for the refrigerant pipes. Use the flare nut attached to the product or a
●
nut compatible with JIS B 8607, Class 2.
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 one attached to the unit or compatible with JIS B 8607, Class 2.
2) In case of reuse: Flare the end of pipe replaced partially for R410A.
D
Protruding
Pipe dia.
dimension
d
mm
6.35
Flare die
9.52
12.7
15.88
19.05
Use phosphorus deoxidized copper alloy seamless pipe (C1220T specified in JIS H 3300) for refrig-
●
eration 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 R410A.
●
Using other refrigerant except R410A (R22 etc.) 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 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.
※Do a flare connection as follows:
● 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.
● 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. Make sure to hold the pipe on the indoor unit securely by a spanner when
tightening the nut in order to avoid unexpected stress on the copper pipe.
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.
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.
Indoor unit
hose
Protruding dimension for flare, mm
Flare nut
Flare O.D.
Min. pipe
tightening torque
Rigid (Clutch type)
wall thickness D
mm mm N·m
For R410A Conventional tool
8.9 ～ 9.1 14 ～ 18
0.8
12.8 ～ 13.2 34 ～ 42
0.8
16.2 ～ 16.6 49 ～ 61
0 ～ 0.5 0.7 ～ 1.3
0.8
19.3 ～ 19.7 68 ～ 82
1
23.6 ～ 24.0 100 ～ 120
1.2
-
Refrigerant pipe (continued)
⑤
<
The case of using thicness of insulation is 10mm
Pipe cover (Accessory)
Band (Accessory)
The thckness of insulation is 10mm
Drain pipe
⑥
Caution
 Install the drain pipe according to the installation manual in order to drain properly.
 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
⑥ Drain pipe (continued)
trap in the midway. In addition, do not put air vent on the drain pipe. Check if water is drained
⑥ Drain pipe (continued)
out properly from the pipe during commissioning. Also, keep sufficient space for inspection and
Work procedure ⑥
Drain pipe (continued)
maintenance.
Work procedure
1. Make sure to insert the drain hose (the end mode of soft PVC) to the end of the step part of drain
Work procedure
socket.
1. Make sure to insert the drain hose (the end mode of soft PVC) to the end of the step part of drain
1. Make sure to insert the drain hose (the end mode of soft PVC) to the end of the step part of drain Attach the hose clamp to the drain hose around 10mm from the end, and fasten the screw within
socket.
5mm left to the nut. socket.
Attach the hose clamp to the drain hose around 10mm from the end, and fasten the screw within
 Do not apply adhesives on this end. Attach the hose clamp to the drain hose around 10mm from the end, and fasten the screw within
5mm left to the nut.
5mm left to the nut.
 Do not apply adhesives on this end.
PJA012D781.indd 2
 Do not apply adhesives on this end.
The step part Drain hose
Drain socket
The step part Drain hose
Drain socket
The step part
Drain hose
Drain socket
No adhesive allowed
No adhesive allowed
No adhesive allowed
Fasten the screw within 5 mm left to the nut.
Fasten the screw within 5 mm left to the nut.
Fasten the screw within 5 mm left to the nut.
Drain socket
Drain socket
Drain socket
Metal plate
10mm
Metal plate
Metal plate
10mm
10mm
2. Prepare a joint for connecting VP-20 pipe, adhere and connect the joint to the drain hose (the end
made of rigid PVC), and adhere and connect VP-20 pipe (prepare on site).
2. Prepare a joint for connecting VP20 pipe, adhere and connect the joint to the drain hose (the end
2. Prepare a joint for connecting VP-20 pipe, adhere and connect the joint to the drain hose (the end As for drain pipe, apply VP-20 made of rigid PVC which is on the market.
made of rigid PVC), and adhere and connect VP20 pipe (prepare on site).
made of rigid PVC), and adhere and connect VP-20 pipe (prepare on site).  Make sure that the adhesive will not get into the supplied drain hose.
As for drain pipe, apply VP20 made of rigid PVC which is on the market.
It may cause the flexible part broken after the adhesive is dried up and gets rigid. As for drain pipe, apply VP-20 made of rigid PVC which is on the market.
 Make sure that the adhesive will not get into the supplied drain hose.
 Do not bend or make an excess offset on the drain hose as shown in the picture.  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.
It may cause the flexible part broken after the adhesive is dried up and gets rigid.
Bend or excess offset will cause drain leakage.
 Do not bend or make an excess offset on the drain hose as shown in the picture.
 Do not bend or make an excess offset on the drain hose as shown in the picture.
Bend or excess offset will cause drain leakage.
Bend or excess offset will cause drain leakage.
3. Make sure to make descending slope of greater than 1/100 and do not make up-down bend and/or
trap in the midway.
3. Make sure to make descending slope of greater than 1/100 and do not make up-down bend and/or
3. Make sure to make descending slope of greater than 1/100 and do not make up-down bend and/or  Pay attention not to give stress on the pipe on the indoor unit side, and support and fix the pipe
trap in the midway.
trap in the midway. as close place to the unit as possible when connecting the drain pipe.
 Pay attention not to give stress on the pipe on the indoor unit side, and support and fix the pipe
 Pay attention not to give stress on the pipe on the indoor unit side, and support and fix the pipe  Do not set up air vent.
as close place to the unit as possible when connecting the drain pipe.
as close place to the unit as possible when connecting the drain pipe.
 Do not set up air vent.
 Do not set up air vent.
Supporting metal
1.5m ~ 2m
Supporting metal
1.5m ~ 2m
Supporting metal
1.5m ~ 2m
Insulation material
Descending slope greater than 1/100
Insulation material
Descending slope greater than 1/100
Insulation material
Descending slope greater than 1/100
 When sharing a drain pipe for more than one
unit, lay the main pipe 100mm below the drain
 When sharing a drain pipe for more than one
 When sharing a drain pipe for more than one outlet of the unit. In addition, select VP30 or
unit, lay the main pipe 100mm below the drain
unit, lay the main pipe 100mm below the drain bigger size for main drain pipe.
outlet of the unit. In addition, select VP-30 or
outlet of the unit. In addition, select VP-30 or
bigger size for main drain pipe.
4. Insulate the drain pipe. bigger size for main drain pipe.
104
-
'17 • SCM-T-225
> < >
The case of using reinfoced insulation
Pipe cover (Prepare on site)
Unit
Band (Accessory)
Band (Prepare on site)
Insulation (Prepare on site)
pipe cover (big)
(For insulation)
(Accessory)
pipe cover (big)
(For insulation)
pipe cover (big)
(Accessory)
(For insulation)
Unit
(Accessory)
Unit
Unit Drain hose
(Accessory)
Connect
Drain hose
Clamp
(Accessory)
Drain hose
(Accessory Pipe cover (small)
Connect
Drain socket
(Accessory)
Clamp
Connect
(Accessory Pipe cover (small)
Pipe cover (small)
Drain socket Clamp
(For insulation)
Pipe cover (small)
(Accessory
Drain socket
(Accessory)
Pipe cover (small)
(For insulation)
Pipe cover (small)
(Accessory)
(For insulation)
(Accessory)
Drain hose
Hose clamp
Drain hose
Hose clamp
Drain hose
Hose clamp
Over 20mm
Over 20mm
Over 20mm
Trapped air will
No bump
generate noises.
Trapped air will
No trap
No bump
Air vent
generate noises.
Trapped air will
No bump
Not touching the water
No trap
generate noises.
Air vent
No trap
Air vent
Not touching the water
Not touching the water
As wide as possible
(about100mm)
As wide as possible
As wide as possible (about100mm)
(about100mm)
VP30 or bigger
Descending stop greater than 1/100
VP-30 or bigger
VP-30 or bigger
Dra
⑥
4. Insulate
 Be s
dew
A
th
dr
Unit
Drain up
 The pos
installat
pipe, the
water fro
length a
⑥
Dra
Drain test
 After ins
⑥
Dra
leakage
 Do drain
Drain test
 For new
 After ins
hanging
leakage
1. Pour wa
 Do drain
pump so
 For new
2. Make su
hanging
Joint for VP-20
leakage
(Prepare on site) 1. Pour wa
Confirm
Joint for VP-20
pump so
(Prepare on site)
Joint for VP20
is opera
(Prepare on site)
2. Make su
check if
leakage
3. Unplug t
VP-20 Confirm
on the d
(Prepare on site)
is opera
VP-20
pipe pro
(Prepare on site)
VP20 check if
(Prepare on site)
(For insulation)
3. Unplug t
(Prepare on site)
Drain pum
(For insulation)
on the d
(Prepare on site)
(For insulation)
Drain pu
pipe pro
 In case
(Prepare on site)
Drain pu
For the o
Drain pum
work.
 In case
 In case
Drain pu
Drain pu
For the o
the Con
work.
[ ① and
 In case
Make su
Drain pu
the Con
[ ① and
⑦
Wir
Make su
 Electrica
installati
Wir
⑦
⑦ Wir
to the te
Be sure
 Electrica
 Use spe
installati
not to ap
to the te
 Do not p
Be sure
miscomm
 Use spe
 Be sure
not to ap
 For the d
 Do not p
miscomm
1. Remove
 Be sure
2. Hold eac
 For the d
3. Fix the w
4. Install a
1. Remove
2. Hold eac
3. Fix the w
4. Install a