Mitsubishi Heavy Industries SCM71ZM-S1 Technical Manual page 111

⑤ Installation of indoor unit
Work procedure
1. Select the suspension bolt locations and the pipe hole location.
(1) Use enclosed paper pattern as a reference, and
drill the holes for the suspension bolts and pipe.
Decide the locations based on direct measurements.
※
(2) Once the locations are properly placed, the paper
pattern can be removed.
2. Install the suspension bolts in place.
3. Fix with 4 suspension bolts, which can endure load of 500N.
4. Check the measurements given at the right
gure for the length of the suspension bolts.
5. Fasten the hanging plate onto the suspension bolts.
<
When installed against a ceiling material,
Air supply
Suspension bolt
Fasten
at the
front
Unit
end of
an
elon-
gated
Hanging plate
※Double nuts
hole.
※Please fasten rmly with double nuts.
6. Install the unit to the hanging plate.
(1) Slide the unit in from front side to get it
hanged on the hanging plate with the bolts.
(2) Fasten the four xing bolts (M8: 2
each on the left and right sides) rmly.
(3) Fasten the two screws (M4: 1 each on
the left and right sides).
WARNINIG : Hang a side panel on from the
panel side to the rear side and
then fasten it securely onto
the indoor unit with screws.
To ensure smooth drain ow, install the unit with
※
a descending slope toward the drain outlet.
CAUTION : Do not give the reversed slope, which may cause water leaks.
⑥ Refrigerant pipe
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
wall thickness
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 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 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.
Paper pattern
Ceiling
Hanging plate
Suspension bolt
> <
No ceiling material to install against,
Suspension bolt
Hanging plate
Nut
Washer
Unit
Ceiling surface
(accessory)
Washer
(accessory)
※Double nuts
Hanging plate
Screw for
hanging
plate (M4)
Fixing bolts
(M8)
(For left-side drain
connection, give the
reverse slope.)
Protruding dimension for flare, mm
Flare O.D. Flare nut
Min. pipe
tightening torque
Rigid (Clutch type)
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
0 ～ 0.5 0.7 ～ 1.3 16.2 ～ 16.6 49 ～ 61
0.8
19.3 ～ 19.7 68 ～ 82
1
23.6 ～ 24.0 100 ～ 120
1.2
-
⑥ Refrigerant pipe (continued)
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.
<
The case of using thicness of insulation is 10mm
Pipe cover (Accessory)
>
Band (Accessory)
The thckness of insulation is 10mm
The pipe can be connected from three different directions. (back, reight, top)
When the pipe is routed through the back.
If the bracket is removed, piping work will become easy.
※After piping, reinstall the removed bracket.
When the pipe is routed through the back.
Cut the removed top cover, and install to
the rear panel instead of rear cover.
⑦ Drain pipe
The drain pipes may face out towards the back to the left, or to the right side.
Caution
Install the drain pipe according to the installation manual in order to drain properly.
Imperfection in draining may cause ood 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
in ammable gas is generated. Toxic gas would ow into the room and
it would cause serious damage to user's health and safety (some poisoning or de ciency
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 ow 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 suf cient space for inspection and maintenance.
Work procedure
1. Insert drain hose completely to the base,
and tighten the drain hose clamp securely.
( adhesive must not be used.)
※ When plumbing on the left side, move the
rubber plug and the cylindrical insulating
materials by the pipe connecting hole on the
left side of the unit to the right side.
Beware of a possible out ow of water that may
occur upon removal of a drain plug.
2. Fix the drain hose at the lowest point with a
hose clamp supplied as an accessory.
※Give a drain hose a gradient of 10mm as
illustrated in the right drawing by laying
it without leaving a slack.
Take head of electrical cables so that they may not run beneath the drain hose.
A drain hose must be clamped down with a hose clamp.
There is a possibility that drain water over ows.
3. Connect VP20(prepare on site) to drain hose. (adhesive must not be used.)
※ Use commercially available rigid PVC general pipe VP20 for drain pipe.
4. Do not to make the up-down bending and trap in the mid-way while assum-
ing that the drain pipes is downhill. (more than 1/100)
Never set up air vent.
5. Insulate the drain pipe.
Insulate the drain hose clamp with the heat insulation supplied as accessories.
When the unit is installed in a humid place, consider precautions against
dew condensation such as heat insulation for the drain pipe.
110
-
'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)
Bracket
Remove
Heat insulation material
Drain
socket
Drain hose (accessory) VP20
Clamp (accessory)
Drain hose
Hose clamp
It can be attached
from both inside and
Lowest point
outside the unit.
No bumps
No traps
Not to be in water
To be a descending
angle
⑦ Drain
Drain test
After ins
conditio
Do drai
⑧ Wirin
Electrica
manual
provider
and oth
Be sure
Unit
Use spe
cord sec
Do not p
cause m
Be sure
For the
electrica
1. Remove
2. Hold ea
3. Fix the w
4. Install th
Single split (
Pipe
VRF(KX) se
Cut
⑨ Atta
The air re
1. Fix the c
grille ont
supplied
Chai
(prepare on site)
⑩ Chec
Check t
Check i
The indo
Inspect
Insulatio
Water is
Power sourc
There is
Earth w
Cable s
Any obst