2
4. The space around the unit is adequate for servicing and the
minimum space for air inlet and air outlet is available.
(Refer to figure 1 and choose one of both possibilities.)
5. There is no danger of fire due to leakage of flammable gas.
6. Ensure that water cannot cause any damage to the location in
case it drips out the unit (e.g. in case of a blocked drain pipe).
7. Select the location of the unit in such a way that neither the
discharged air nor the sound generated by the unit disturb
anyone.
P
RECAUTIONS
Do not install or operate the unit in sites mentioned below.
• Where mineral oil like cutting oil is present;
• Where the air contains high levels of salt;
• Where sulphurous gas exists such as at areas with hot springs;
• Where voltage fluctuates a lot;
• In vehicles or vessels;
• Where high concentrations of oil vapour or spray are present;
• Where machines generating excessive electromagnetic waves
are installed;
• Where acidic or alkaline vapour is present.
Caution
In heavy snowfall areas, select an installation site where snow
will not affect operation of the unit.
R
EFRIGERANT
PIPING
All field piping must be installed by a licensed refrigeration
technician and must comply with relevant local and national
regulations.
R
EFRIGERANT
PIPE
SIZE
AND
ALLOWABLE
PIPE
LENGTH
Refrigerant pipe size
1. Pair system (Refer to figure 5A)
2. Simultaneous operation system
Allowable pipe length
P
RECAUTIONS
ON
REFRIGERANT
PIPING
When the outdoor unit is installed below the indoor unit, the
following can occur:
• When the unit stops, oil will return to the discharge side of the
compressor. When starting the unit, this can cause liquid (oil)
hammer.
• The oil circulation will decrease.
To solve these phenomena, provide oil traps in the gas pipe every
15 m if the level difference (H) is more than 15 m.
H
3
2
5
4
1
Note
If the outdoor unit is installed above the indoor unit, oil traps
are not necessary.
C
ONNECTING
THE
REFRIGERANT
PIPING
1. Installation of refrigerant piping is possible as front connection,
side connection and bottom connection.
1. Flange
2. Flare nut
3. Gas side attached pipe
4. Liquid side attached pipe
5. Brazing
6. Knock out hole (use a hammer)
• Twin and Triple operation system (Refer to figure 5B and 5C)
Caution
The pipes between the outdoor unit and the branch should
have the same size as the outdoor connections.
The pipes between the branch and the indoor units should
have the same size as the indoor connections.
• Double twin operation system (Refer to figure 5D)
1. Outdoor unit
2. Indoor unit
3. Gas pipe
4. Liquid pipe
5. Oil trap
R(Y)250
Ø28.6
Ø12.7
Ø15.9
Ø25.4
R(Y)200
Gas
Liquid
Refrigerant pipe size
R(Y)250
Ø28.6
Ø12.7
Ø15.9
Ø25.4
R(Y)200
Gas
Liquid
Refrigerant pipe size
Ø19.1
Ø9.5
Ø9.5
Ø19.1
Gas
Liquid
Ø15.9
Ø6.4
Ø9.5
Ø12.7
Gas
Liquid
L1
L2 - L3
L4 - L5 - L6 - L7
double twin
twin/triple
pair
50 m
-
-
-
-
-
-
-
-
30 m
-
-
-
50 m
50 m
-
-
20 m
20 m
-
-
10 m
10 m
-
10 m
-
10 m
-
0,5 m
-
-
L1
L1 + L2, L1 + L3, L1 + L4
L1 + L2 + L3
L2, L3, L4
L2 + L4
L1 - L2, L2 - L4, L3 - L4
(L2 + L4) - (L3 + L7)
L2 - L3
L4 - L5, L6 - L7
H1, H2, H3, H4, H5
H
max. allowable piping length
max. branch pipe length
max. difference between
branch lengths
max. difference between each
1st branch
max. difference between each
2nd branch
max. height difference between
indoor and outdoor
-
-
0,5 m
H1, H2, H3
30 m
30 m
max. height difference between
indoors
