Installation Of Outdoor Unit; Connection Of Refrigerant Pipings - Mitsubishi SCM40ZJ-S Service Manual

2

INSTALLATION OF OUTDOOR UNIT

Drainage
There are 2 holes in the bottom panel of the outdoor unit to drain condensation.
Install the outdoor unit so it will be horizontal.
Also, secure the legs of the unit to a firm foundation to prevent any instabilities.
Secure it firmly so the unit will not fall during earthquakes and from sudden gusts of wind.
In areas where the temperatures drop below 0˚C for several continuous days, do
not install a drain elbow. (water discharge could stop due to freezing.)
Connection of the power supply cable and the connecting cables
for indoor and outdoor units.
This multi-type room air conditioner receives its power from outside.
To ensure correct connections, mark each ends of the cables with number, A and B.
It is important to use the same number the corresponding cables and pipes.
An earth leakage breaker and a circuit breaker must be installed.
Their capacities are 25A.
Remove the service panel. (Remove the screw of the service panel.)
Remove the terminal cover. (Remove the screw of the terminal cover.)
Connect the power supply cable and the connection wire securely to the terminal block.
POWER SUPPLY CODE
CENELEC code for cables requiring fields cables. H05RNR3G4.0
INTERCONNECTING WIRING CODE
CENELEC code for cables requiring fields cables. H05RNR4G1.5
1) In wiring, make sure that the wire terminal numbers of outdoor unit terminal
block are match to the wire terminal numbers of indoor unit terminal block.
2) Terminal number A of the outdoor unit is used for A indoor unit and terminal
number B for B indoor unit respectively.
After connecting the wire, use wiring clamps to secure the wiring.
Fit the terminal cover and the service panel.
3

CONNECTION OF REFRIGERANT PIPINGS

[Connection of pipes]
NOTE
Cover the pipes with tape so that dust and sand do not enter the pipe until they are
connected.
When connecting the pipes to the outdoor unit, be careful about the discharge of fluorocarbon
gas or oil.
Make sure to match the pipes between the indoor unit and the outdoor unit with the
correct operation valves.
Outdoor
Press
Remove
Remove the flared nuts.
(on both liquid and gas sides)
CAUTION
Do not apply excess torque to the flared nuts.
Otherwise, the flared nuts may crack depending
on the conditions and refrigerant leak may occur.
Connection
Outdoor
Liquid side
Gas side
Connect the pipes on both liquid and gas sides.
Tighten the nuts to the following torque.
Liquid side : 14.0 18.0N m ( 1.4 1.8kgf m )
Gas side ( 9.52): 33.0 42.0N m (3.3 4.2kgf m)
Dimension A
Liquid side 9.1dia.
A
Gas side
9.52 : 13.2dia
Install the removed flared nuts to the pipes
to be connected, then flare the pipes.
CAUTION
Do not apply refrigerating machine
oil to the flared surface.
Gas Leakage Test
Ensure that there are no gas leaks from the pipe
joints by using a leak detector or soap water.
The screw of the service panel is tightened securely.
Service panel
Circuit
breaker
Copper pipe
Clutch typr flare tool for
diameter
R410A
6.35
9.52
Use a flare tool designed for R410A or a conventional flare tool. Please note that
measurement B (protrusion from the flaring block) will vary depending on the type of a
flare tool in use.
If a conventional flare tool is used, please use copper pipe gauge or a similar
instrument to check protrusion so that you can keep measurement B to a correct value.
159
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'11 • SCM-SM-110
Drain hole
Terminal cover
Screw
POWER
SUPPLY
View of Terminal block
outdoor unit
unit A unit B
1 2 3 1 2 3
L N
1 2 3 1 2 3
Earth
leakage
unit A unit B
breaker
indoor unit
Measurement B ( mm )
Conventional (R22) flare tool
Clutch type
0.0 0.5 1.0 1.5
0.0 0.5 1.0 1.5
Measurement B
Flaring
Copper pipe
block
[Limit]
one indoor unit
piping length
all indoor unit
MAX 15m
hight difference outdoor
MAX
unit
25m
MAX 15m
length of chargeless
30m
refrigerant pipe
4 A
Re
Aft
Proc
(1) S
(2) C
(3) F
(4) A
unit A unit B
(5) R
(6) R
(7) E
5
Hea
Fini
Wing nut type
1.5 2.0
1.5 2.0
7
Ma
out
Be
can
[Corr
Indoor
MAX 25m
MAX 30m
indoor
unit
indoor EAR
unit
Ear
indoor
sho
unit
The
dan
Tow
Sin
on
ap
p
p
i
l
H
B
R