13
1-9. System Limitations
Table 13 System Limitations
Max. No. allowable connected outdoor units
3 *
2
Max. capacity allowable connected outdoor units 135 kW (48 HP)
Max. connectable indoor units
52 *
1
Max. allowable indoor/outdoor capacity ratio
50 – 150 %*
3
Maximum number of connectable indoor units when connected with minimum capacity
Total horse
power
Number of
indoor units
Total horse
power
Number of
indoor units
Total horse
power
Number of
indoor units
8 HP
15
16 HP
30
24 HP
46
10 HP
19
18 HP
34
26 HP
49
12 HP
22
20 HP
38
28-48 HP
52
14 HP
27
22 HP
41
*1: In the case of 26 HP or smaller units, the number is limited
by the total capacity of the connected indoor units.
*2: Up to 3 units can be connected if the system has been
extended.
*3: It is strongly recommended that you choose the unit so the
load can become between 50 and 130%.
Table 12 Necessary Amount of Additional Refrigerant Charge per meter, According to Discharge Tubing Size
Discharge tubing size
mm
ø12.7
ø15.88
ø19.05
ø22.22
ø25.4
ø28.58
ø31.75
ø38.1
Additional amount
g
/m
12
21
31
41
55
71
89
126
* Additional refrigerant charge amount of discharge tubing should be less than 9,000
g
.
Table 14 System Limitations of Total Refrigerant Amount
Combination number of outdoor unit
1
2
3
Upper limit
k
g
50
80
105
Make sure the values calculated using the following formula should not exceed the maximum allowable values (Table 13).
Total refrigerant amount = Refrigerant charge amount at shipment (for outdoor unit)
+ Necessary amount of additional refrigerant charge per meter according to liquid tubing size
+ Necessary amount of additional refrigerant charge per outdoor unit
+ Necessary amount of additional refrigerant charge per meter according to discharge tubing size
1-10. Installation Standards
Relationship between A/C units and refrigerant tubing
Outdoor unit
Suction tube
Discharge tube
Liquid tube
Balance tube
Suction tube
Discharge tube
Liquid tube
Gas tube
Liquid tube
Outdoor unit
Indoor unit
Solenoid valve
kit
4-tube layout
3-tube layout
2-tube layout
●
Install the solenoid valve kit 50 m or less from the indoor unit.
●
In quiet locations such as hospitals, libraries, and hotel rooms, the refrigerant noise may be somewhat noticeable. It is recommended
that the solenoid valve kit be installed inside the corridor ceiling, at a location outside the room.
●
The solenoid valve kit must be located not less than 2.5 m above the floor or that cannot be touched.
Strongly recommended installation
Hallway
Room
Indoor unit
Room
Indoor unit
Room
Indoor unit
Room
Indoor unit
Solenoid
valve kit
Solenoid
valve kit
Hallway
Avoid
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