Installation Of Outdoor Unit - Mitsubishi Heavy Industries SRK20ZJX-S Service Manual

2

INSTALLATION OF OUTDOOR UNIT

Drainage
There are 3 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 to D. 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 2 sets screws of the service panel.)
Remove the terminal cover.(Remove the 2 sets screws 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
Regarding the change in the sizes of gas side pipes (usage of the variable joints);
If a 5.0, 6.0 kw class indoor unit (gas side pipe 12.7) is going to be connected to the
operation valves (9.52), variable joints available as accessories must be applied to the
gas side operation valves.
Securely fit the copper packing between the operation valve and the variable
diameter joint to prevent shifting.
[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. Install the removed flared nuts to the pipes
(on both liquid and gas sides) to be connected, then flare the pipes.
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)
( 12.7): 49.0 61.0N m (4.9 6.1kgf m)
Dimension A
Liquid side 9.1dia.
A
Gas side
9.52 : 13.2dia
12.7 : 16.2dia.
CAUTION
When the total refrigerant pipe lenght for all the
rooms exceeds the lenght of the uncharged pipe
(40m), additional refrigerant is required.
(If 40m or less, additional charge is not required.)
Additional charge amount per meter = 20g/m
Gas Leakage Test
Ensure that there are no gas leaks from the pipe
joints by using a leak detector or soap water.
Screw
Service panel
Circuit Earth
breaker leakage
breaker
[Examples of use of variable diameter joints]
Connection of indoor unit of Class 5.0 to A unit.
6.35
9.52
12.7
137
- -
'10 • SCM-SM-094
drain hole
Terminal cover
unit C
Screw
POWER
unit A
SUPPLY
View of Terminal block
outdoor unit
unit B
unit A unit C
1 2 3 1 2 3 1 2 3
L N
1 2 3 1 2 3 1 2 3
unit A unit B unit C
indoor unit
0.0 1.0
0.0 1.0
0.0 1.0
Measurement B
Flaring
Copper pipe
block
Limit
one indoor unit
piping length
all indoor unit
MAX 20m
hight difference outdoor
MAX
unit
25m
MAX 20m
length of chargeless
40m
refrigerant pipe
4 AI
Sinc
on t
appl
Rem
After
Proce
(1) Se
(2) Co
(3) Fu
unit D
unit B
(4) Af
(5) Re
unit D
(6) Re
1 2 3
(7) En
5 HE
1 2 3
unit D
Heat
7
Make
1.5
1.5
outdo
2.0
Be ca
cann
[Corre
Indoo
MAX 25m
MAX 70m
indoor
unit
EAR
indoor
unit
Earth
indoor shock
unit
The c
indoor
dange
unit
Town
pre
va
pu
is
liq
B
R
D
C
B
A