Panasonic U-8ME1E8 Installation Instructions Manual page 58

Tube diameter of each outdoor unit (Continued)
Select the diameter of these tubes according to the
outdoor unit capacity in the high-COP mode.
Example: When the capacity is 10 hp in the high-COP mode
• You need to use reducers (field supplied) to connect the 22.22 mm diameter tube (Table
2) to the 25.4 mm diameter gas valve (Table 1).
However, only for the system to which more than two outdoor units are connected, you
can use 25.4 mm diameter tubes without using any reducers.
• You need to use reducers (field supplied) to connect the 9.52 mm diameter tube (Table 2)
to the 12.7 mm diameter liquid valve (Table 1).
However, only for the system to which more than two outdoor units are connected, you
can use 12.7 mm diameter tubes without using any reducers.
Setting procedure
(1) Turn off all outdoor units.
(2) Set the DIP switch (S011) to "ON" on all main outdoor units PCB for
setting the high-COP mode.
If multiple outdoor units are connected to a system, perform the
same step on each of the outdoor units. In the case of combination
with the 8HP (U-8ME1E8 (E)), do set in a similar manner noted
above.
If one of the outdoor units is not set in the "ON" position, the alarm
message indicates "L17".
(3) Switch on the outdoor unit.
Now the setting is over.
Paste the label of "HIGH COP MODE" on the outdoor unit set in the
high-COP mode.
The purpose of this notice is to inform that the unit is in the high-COP
mode before maintenance is performed.
NOTE
• It may sometimes happen that the power consumption increases to that in the standard COP mode temporarily due to the
maintenance drive of the outdoor unit although the high-COP mode has been set. The electrical capacitance (electrical wire
length, diameter, breaker capacity and electrical capacitance for the building) should be in the same manner of the standard
COP mode.
• Be sure that the total load of indoor units (load when operating the maximum number of units) should not exceed 130% of
outdoor unit capacity. The limitation of the indoor-outdoor capacity ratio is 200% against the outdoor capacity in the high-COP
mode.
• Select the tube length and size equivalent to the content described on pages 9 and 10 in the installation instructions. Be sure to
read the total capacity of outdoor units as that in the high-COP mode.
• Select the optional distribution joints suited to the capacity.
However, when you used the tube diameter for the standard COP mode between the outdoor unit and the first distribution joint
in a system to which more than two outdoor units are connected, select joint suited to the capacity in the standard COP mode.
• The additional refrigerant charge should be calculated according to the liquid tubing size.
• The installation space is equivalent to that of the standard COP mode.
• The shield for horizontal exhaust and wind ducting are equivalent to that of the standard COP mode.
Table 1
Standard
COP
mode
Table 2
High-COP
mode
Gas valve diameter of outdoor unit
Fig. 1
Liquid valve diameter of outdoor unit
* Only for the system to which more than two outdoor units are
connected, you can use the tube diameter for the standard COP
mode up to the first distribution joint.
57
Capacity 14 hp
Gas tubing ø25.4
Liquid tubing ø12.7
Capacity 10 hp
Gas tubing ø22.22
Liquid tubing ø9.52
ø25.4
ø12.7
3
Unit: mm
16 hp 18 hp 20 hp
ø28.58 ø28.58 ø28.58
ø12.7 ø15.88 ø15.88
12 hp 14 hp 16 hp
ø25.4 ø25.4 ø28.58
ø12.7 ø12.7 ø12.7
ø25.4 ø28.58 ø28.58
ø12.7 ø15.88 ø15.88
Unit: mm
100