Panasonic U-8MF1E8 Mode D'emploi page 12

Distribution joint tubing
Outdoor side A: ø12.7 B: ø9.52 C: ø9.52
(from outdoor unit connection tubing)
Indoor side 1: ø9.52 2: ø9.52 3: ø9.52 4: ø9.52
5: ø9.52 6: ø9.52 7: ø9.52
(from indoor unit connection tubing)
● Obtain additional charge amount.
Note 1:
The charge amounts per 1 meter are different for each liquid
tubing size.
ø19.05 → LA + LB
: 45 m × 0.259 kg/m = 11.655
ø15.88 → LO + LC + LD
: 22 m × 0.185 kg/m = 4.07
ø12.7 → LE + A
: 12 m × 0.128 kg/m = 1.536
ø9.52 → LF + B – C + 1 – 7 : 73 m × 0.056 kg/m = 4.088
Total 21.349 kg
Additional refrigerant charge amount is 21.349 kg.
Note 2:
Necessary amount of additional refrigerant charge per outdoor
unit (U-14MF1E8) is 3.2kg. (See the Table 1-9-2.)
Note 1) Amount of additional charge per tubing length : 21.349kg
Note 2) Amount of additional charge per outdoor unit : 3.2 kg
Total of additional refrigerant charge amount : 24.549kg
Therefore, the total of additional refrigerant charge amount
reaches 24.549kg.
● Obtain overall refrigerant charge amount.
Overall refrigerant charge amount of the system indicates
the calculated value shown above the additional charge
amount in addition to the total of the refrigerant charge
amount (shown in the Table 1-10) at the shipment of each
outdoor unit.
Refrigerant charge amount at shipment:
U-10MF1E8 : 11.8 kg
U-10MF1E8 : 11.8 kg
U-14MF1E8 : 11.8 kg
Additional charge amount : 24.549 kg
Grand total : 59.949kg
Therefore, overall refrigerant charge amount of the system
reaches 59.949kg.
CAUTION
Be sure to check the limit density for the room in which the
indoor unit is installed.
Checking of limit density
Density limit is determined on the basis of the size of a room
using an indoor unit of minimum capacity. For instance, when
× ceiling
an indoor unit is used in a room (floor area 15 m 3
height 2.7 m = room volume 40.5 m 3 ), the graph below shows
that the minimum room volume should be 199.8 m 3 (floor area
74.0 m 2 ) for refrigerant of 59.949 kg. Accordingly, openings
such as louvers are required for this room.
<Determination by calculation>
Overall refrigerant charge amount for the air conditioner: kg
(Minimum room volume for indoor unit: m 3 )
59.949 (kg)
3 3
= = 1.48 (kg/m ) > 0.3 (kg/m )
3
40.5 (m )
Therefore, openings such as louvers are required for this room.
SUPPLEMENT
2 3
m m
125 337.5
120 324.0
115 310.5
110 297.0
105 283.5
100 270.0
95 256.0
90 243.0
Range below the
85 229.5
density limit of
80 216.0
0.3 kg/m³
75 202.5
(Countermeasures
70 189.0
not needed)
65 175.5
60 162.0
55 148.5
Range above the
50 135.0
density limit of 0.3
45 121.5
kg/m³
40 108.0
(Countermeasures
35 94.5
needed)
30 81.0
25 67.5
20 54.0
15 40.5
10 27.0
5 13.5
0 0.0
0 10 20 30 40 50 60 70 80 90 100
Total amount of refrigerant
2. SELECTING THE INSTALLATION SITE
2-1. Outdoor Unit
AVOID:
● heat sources, exhaust fans, etc. (Fig. 2-1)
● damp, humid or uneven locations
● indoors (no-ventilation location)
DO:
● choose a place as cool as possible.
● choose a place that is well ventilated.
● allow enough room around the unit for air intake/
exhaust and possible maintenance. (Fig. 2-2)
Exhaust fan
Hot air
Heat source
Out-
door
unit
Fig. 2-1
Installation space
Install the outdoor unit where there is enough space for
ventilation. Otherwise the unit may not operate properly. Fig. 2-2
shows the minimum space requirement around the outdoor units
when 3 sides are open and only 1 side is shuttered, with open
space above the unit. The mounting base should be concrete
or a similar material that allows for adequate drainage. Make
provisions for anchor bolts, platform height, and other site-
specific installation requirements.
19
Example of installation of 2 units
(When wall height is below 1800 mm)
* More than 100 mm
* More than
50 mm
* More than 100 mm
* However, be sure to ensure a space of 300 mm or
more at either the right side or the rear of the unit.
CAUTION
● Leave space open above the unit.
● Construct louvers or other openings in the wall, if
kg
necessary, to ensure adequate ventilation.
890 (Ceiling panel dimensions)
920 (Installation pitch)
950 (Maximum dimensions)
Top view
N OTE
● Do not do any wiring or tubing within 300 mm of the front
panel, because this space is needed as a servicing space for
the compressor.
● Ensure a base height of 100 mm or more to ensure that
* More than 100 mm
drainage water does not accumulate and freeze around the
bottom of the unit.
● If installing a drain pan, install the drain pan prior to installing
the outdoor unit.
* Make sure there is at least 150 mm between the outdoor unit
* More than
and the ground.
500 mm
Also, the direction of the tubing and electrical wiring should
be from the front of the outdoor unit.
2-2. Shield for Horizontal Exhaust Discharge
It is necessary to install an air-discharge chamber (field supply)
to direct exhaust from the fan horizontally if it is difficult to
provide a minimum space of 2 m between the air-discharge
outlet and a nearby obstacle. (Fig. 2-4)
Fig. 2-2
CAUTION
In regions with heavy snowfall, the outdoor unit should
be provided with a solid, raised platform and snow-proof
vents. (Fig. 2-5)
AVOID
Fig. 2-3
Without snow-
proof vents
(Low platform)
20
Fig. 2-4
DO
Fallen snow
With snow-proof
vents
(High platform)
Fig. 2-5