Mitsubishi Heavy Industries SCM71ZM-S1 Technical Manual page 115

⑤Refrigerant 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
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 H3300) 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.
●When pulling out pipes backward or upward, install them passing through the attached
cover together with the electrical cabling.
●Seal the gap with putty, or other, to protect from dust, etc.
※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.
<
The case of using thicness of insulation is 10mm
Pipe cover (Accessory)
Unit
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.
Bracket
When the pipe is routed through the top.
Cut the removed top cover, and install to
the rear panel instead of rear cover.
Protruding dimension for flare, mm
Flare O.D. Flare nut
Min. pipe
tightening torque
wall thickness 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
> < >
The case of using reinfoced insulation
Pipe cover (Prepare on site)
Unit
Band (Accessory)
Band (Prepare on site)
Insulation (Prepare on site)
Pipe
Remove
⑥Drain pipe
●The drain pipes may pull out either from back, right or left 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.
Drain test
After installation of drain pipe, make sure that drain system work in good
condition and no water leakage from joint and drain pan.
Do drain test even if installation of heating season.
⑦Wiring-out position and wiring connection
Electrical installation work must be performed according to the installation
manual by an electrical installation service provider quali ed by a power
provider of the country, and be executed according to the technical standards
and other regulations applicable to electrical installation in the country.
Be sure to use an exclusive circuit.
Use speci ed cord, fasten the wiring to the terminal securely, and hold the
cord securely in order not to apply unexpected stress on the terminal.
Be sure to do D type earth work.
For the details of electrical wiring work, see attached instruction manual for
electrical wiring work.
1. Remove wiring from clips.
2. Remove the control box (Screw ①, ②pcs).
3. Pull out the control box by sliding along the groove on the bracket
(Direction Ⓐ→Ⓑ).
4. Remove the lid of control box (Screw ②, ②pcs).
5. Hold each wiring inside the unit and connect to the terminal block surely.
6. Fix the wiring by clamp.
7. Install the lid of control box (Screw ②, ②pcs).
8. Return the control box to the original place by sliding along the groove on
the bracket (Direction Ⓑ→Ⓐ).
9. Install the removed parts at their original places.
※1 Wiring for the signal receiving section of wireless kit (Optional) are connected
to the X and Y terminals on the terminal block (the site connection side),
when the indoor unit is shipped from the factory.
It is not necessary to disconnect these wiring when wired remote control is
connected. When the wired/wireless kits are used together, it becomes
necessary to set the slaves and remote control.
Cut
114
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'17 • SCM-T-225
Heat insulation material
Drain
socket
Drain hose (accessory) VP20
(prepare on site)
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
⑦Wi
1.
FDE (
FDE (
FDE (
3.
Ⓐ Ⓐ
Ⓑ Ⓑ
Brack
4.
Screw
7 8.
Control b
Ⓐ Ⓐ
⑧Co
The con
Switc
SW8
⑨At
The ai
1. Fix th
grille
supp
⑩Ch
Che
Chec
The in
Inspe
Insula
Wate
Power s
There
Earth
Cable
Any o