Panasonic U-8MF1E8 Installation Instructions Manual page 8

Table 1-6 Indoor Unit Tubing Connection Size ( 1 – 40)
Indoor unit type 22 28 36
Suction tubing (mm)
Distribution joint –
solenoid valve kit Discharge tubing (mm)
tubing
Liquid tubing (mm)
Solenoid valve kit –
Gas tubing (mm) ø12.70
Indoor unit tubing
Liquid tubing (mm) ø6.35
connection
*1: For the solenoid valve kits, use CZ-P160HR2 with parallel specifi cations. Branch the tubing before and after the solenoid valve kits.
1-7. Straight Equivalent Length of Joints
Design the tubing system by referring to the following table for the straight equivalent length of joints.
Table 1-7 Straight Equivalent Length of Joints
Gas tubing size (mm) 12.7 15.88 19.05
0.30 0.35 0.42
90° elbow
45° elbow 0.23 0.26 0.32
U-shape tube bent
0.90 1.05 1.26
(R60 − 100 mm)
Trap bend 2.30 2.80 3.20
Equivalent length conversion not needed.
Y-branch distribution joint
Ball valve for service Equivalent length conversion not needed.
Table 1-8 Refrigerant tubing (Existing tubing can be used.)
Tubing size (mm)
Material O Material 1/2H • H
ø6.35 t0.8 ø25.40 t1.0
ø9.52 t0.8 ø28.58 t1.0
ø12.7 t0.8 ø31.75 t1.1
ø15.88 t1.0 ø38.10 t1.15
ø19.05 t1.0 ø41.28 t1.20
ø22.22 t1.15
1-8. Additional Refrigerant Charge
Additional refrigerant charge amount is calculated from the liquid tubing total length as follows.
Required amount of additional refrigerant charge = [ (Amount of additional refrigerant charge per meter of each size of liquid tube × its tube
length) + (...) + (...)] + [(Necessary amount of additional refrigerant charge per
*Always charge accurately using a scale for weighing.
Table 1-9-1 Amount of Additional Refrigerant Charge Per Meter, According to Liquid Tubing Size
Liquid tubing size (mm) 6.35 9.52 12.7 15.88 19.05 22.22
Amount of additional
26 56 128 185
refrigerant charge/m (g/m)
Table 1-9-2 Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit
U-8MF1E8 U-10MF1E8
Table 1-10 Refrigerant Charge Amount at Shipment (for Outdoor Unit)
U-8MF1E8 U-10MF1E8
11.8 kg 11.8 kg
SUPPLEMENT
45 56 73 90 106 140 160 224
ø15.88 ø19.05 ø22.22
ø12.70 ø15.88 ø19.05
ø9.52
ø15.88 ø19.05 ø22.22
ø9.52
22.22 25.4 28.58 31.8 38.1
0.48 0.52 0.57 0.70 0.79
0.36 0.39 0.43 0.53 0.59
1.44 1.56 1.71 2.10 2.37
3.80 4.30 4.70 5.00 5.80
* When bending the tubes, use a bending radius that is
at least 4 times the outer diameter of the tubes.
In addition, take sufficient care to avoid crushing or
damaging the tubes when bending them.
outdoor unit + (...) + (...)]
259 366
U-12MF1E8 U-14MF1E8 U-16MF1E8
3.2 kg 3.2 kg
U-12MF1E8 U-14MF1E8 U-16MF1E8
11.8 kg 11.8 kg 11.8 kg
11
1-9. System Limitations
*1 *1
280
Table 1-11 System Limitations
Max. No. allowable connected outdoor units
Max. capacity allowable connected outdoor units
Max. connectable indoor units
Max. allowable indoor/outdoor capacity ratio
*1: In the case of 22 hp (type 61.5 kW) or smaller units, the number is limited by the total capacity of the connected indoor units.
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 30 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.
Room
Desirable Indoor unit
Hallway
Common solenoid valve kit
● Multiple indoor units under group control can utilize a solenoid valve kit in common.
● Categories of connected indoor unit capacities are determined by the solenoid valve kit.
Type of solenoid valve kit
CZ-P160HR2
CZ-P56HR2
● If the capacity range is exceeded, use 2 solenoid valves connected in parallel.
3
135 kW (48 hp)
40 * 1
50 – 130%
3-tube layout
Solenoid
Outdoor unit
valve kit
Suction tube
Discharge tube
Liquid tube
Room Room Room
Indoor unit Undesirable Indoor unit
Hallway
Solenoid
valve kit
Total capacity of indoor units (kW)
5.6 < Total capacity ≤ 16.0
2.2 ≤ Total capacity ≤ 5.6
12
2-tube layout
Indoor unit
Gas tube
Liquid tube
Indoor unit
Solenoid
valve kit