System Limitations; Installation Standards - Panasonic U-8MF3R7 Installation Instructions Manual

Table 12 Necessary Amount of Additional Refrigerant Charge per meter, According to Discharge Tubing Size
Discharge tubing size
Additional amount
*Additional refrigerant charge amount of discharge tubing should be less than 9,000g.

1-9. System Limitations

Table 13 System Limitations
Max. No. allowable connected outdoor units
Max. capacity allowable connected outdoor units
Max. connectable indoor units
Max. allowable indoor/outdoor capacity ratio
Maximum number of connectable indoor units when connected with minimum capacity
Total horse Number of
power indoor units
8 HP 15
10 HP 19
12 HP 22
14 HP 27
Table 14 System Limitations of Total Refrigerant Amount
Combination number of outdoor unit
Upper limit
Make sure the values calculated using the following formula should not exceed the maximum allowable values (Table 13).
Total refrigerant amount =

1-10. Installation Standards

Relationship between A/C units and refrigerant tubing
4-tube layout
Outdoor unit
Suction tube
Discharge tube
Liquid tube
Balance tube
● 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
Room Room
Indoor unit Indoor unit
Hallway
mm ø12.7
g/m
12
3 *
135 kW (48 HP)
52 *
50 – 150 %*
Total horse Number of
power indoor units
16 HP
18 HP
20 HP
22 HP
1
kg 50
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
Outdoor unit
Solenoid
valve kit
ø15.88 ø19.05 ø22.22
21 31 41
*1: In the case of 26 HP or smaller units, the number is limited
2
by the total capacity of the connected indoor units.
*2: Up to 3 units can be connected if the system has been
extended.
1
*3: It is strongly recommended that you choose the unit so the
3
load can become between 50 and 130%.
Total horse
power
30 24 HP
34 26 HP
38 28-48 HP
41
2 3
80 105
3-tube layout
Solenoid valve
Suction tube
Discharge tube
Liquid tube
Avoid
Room Room
Indoor unit
Hallway
13
ø25.4 ø28.58
55 71
Number of
indoor units
46
49
52
2-tube layout
kit
Gas tube
Liquid tube
Indoor unit
ø31.75 ø38.1
89 126
Indoor unit
Solenoid
valve kit