Panasonic U-8ME1E8 Mode D'emploi page 10

SUPPLEMENT
1-13. Example of Tubing Size Selection and Refrigerant Charge Amount
Additional refrigerant charging
Based on the values in Tables 1-3, -4, -5, -6, 9-1 and 9-2, use the liquid tubing size and length, and calculate the amount of additional
refrigerant charge using the formula below.
Required additional =[366 ×(a) + 259 ×(b) + 185 ×(c) + 128 ×(d) + 56 ×(e) + 26 ×(f)] ×10
refrigerant charge (kg) additional refrigerant charge per outdoor unit.
(a) : Liquid tubing Total length of ø22.22 (m) (d) : Liquid tubing Total length of ø12.7 (m)
(b) : Liquid tubing Total length of ø19.05 (m) (e) : Liquid tubing Total length of ø9.52 (m)
(c) : Liquid tubing Total length of ø15.88 (m) (f) : Liquid tubing Total length of ø6.35 (m)
● Charging procedure
Be sure to charge with R410A refrigerant in liquid form.
1. After performing a vacuum, charge with refrigerant from the liquid tubing side. At this time, all valves must be in the "fully closed"
position.
2. If it was not possible to charge the designated amount, operate the system in Cooling mode while charging with refrigerant from
the gas tubing side. (This is performed at the time of the test run. For this, all valves must be in the "fully open" position. However
if only one outdoor unit is installed, a balance tube is not used. Therefore, leave the valves fully closed.)
Charge with R410A refrigerant in liquid form.
With R410A refrigerant, charge while adjusting the amount being fed a little at a time in order to prevent liquid refrigerant from
backing up.
● After charging is completed, turn all valves to the "fully open" position.
● Replace the tubing covers as they were before.
1. R410A additional charging absolutely must be done through liquid charging.
2. The R410A refrigerant cylinder has a gray base color, and the top part is pink.
CAUTION
3. The R410A refrigerant cylinder includes a siphon tube. Check that the siphon tube is present.
(This is indicated on the label at the top of the cylinder.)
4. Due to differences in the refrigerant, pressure, and refrigerant oil involved in installation, it is
not possible in some cases to use the same tools for R22 and for R410A.
Balance tube
Use a flathead screwdriver and
open by turning the part with the
screw groove to the right, from
"–" to "|".
Liquid tube
Use a Hexagonal wrench and turn
to the left to open.
Hexagonal wrench width : 8 ~ 16 hp types 4 mm
18 ~ 20 hp types 5 mm
Gas tube
8 hp type :
Use a flathead screwdriver and open by turning the part
with the screw groove to the left, from "–" to "|".
10 ~ 20 hp types :
Use pliers and turn 90 degrees to the left and open.
–3
+ Necessary amount of
Turn 90 degrees to the left.
Fully closed (at shipment) Fully open
How to turn the tub
(10 ~ 20 hp types)
15
Example:
Outdoor unit
12 hp 14 hp 16 hp
type type type
C B A
LB
LA
LO
1
160 type 106 type
● Example of each tubing length
Main tubing Distribution joint tubing
LO = 2 m LD = 15 m Outdoor side
LA = 40 m LE = 10 m A = 2 m
LB = 5 m LF = 10 m B = 2 m
LC = 5 m C = 3 m
Note :The maximum tubing length (equivalent length) exceeds 90 m.
● Obtain liquid tubing size from Tables 1-3, -4, -5, -6 and 9-1.
Main tubing
LO = ø19.05 m (Total capacity of outdoor unit is 73.5 kW)
LA*= ø22.22 m (Total capacity of outdoor unit is 118.0 kW)
LB = ø19.05 m (Total capacity of indoor unit is 77.9 kW)
LC = ø15.88 m (Total capacity of indoor unit is 67.3 kW)
The longest main tubing length in this example (LM = 40 + 5 = 45 m)
* The tubing size ø19.05 was increased to ø22.22.
Distribution joint tubing
Outdoor side A: ø12.7 B: ø12.7 C: ø12.7 (from outdoor unit connection tubing)
Indoor side 1: ø9.52 2: ø9.52 3: 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.
ø22.22 LA : 40 m ×0.366 kg/m = 14.640
ø19.05 LB + LO : 7 m ×0.259 kg/m = 1.813
ø15.88 LC + LD : 20 m ×0.185 kg/m = 3.7
ø12.7 LE + A + B + C : 17 m ×0.128 kg/m = 2.176
ø9.52 LF +( 1 – 7) : 68 m ×0.056 kg/m = 3.808
Total 26.137 kg
Note 2*
Necessary amount of additional refrigerant charge per outdoor unit (See the Table 1-9-2.)
Amount of additional charge per outdoor unit : U-12ME1E8(E)
U-14ME1E8(E)
U-16ME1E8(E)
Therefore,
*Note 1 : Amount of additional charge per tubing length :
*Note 2 : Amount of additional charge per outdoor unit :
Therefore, the total of additional refrigerant charge amount reaches 42.437 kg.
● 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-12ME1E8(E)
U-14ME1E8(E)
U-16ME1E8(E)
Additional charge amount
Grand total
Therefore, overall refrigerant charge amount of the system reaches 72.137 kg.
LC LE LF
LD
2 3 4 5 6 7
140 type 160 type 160 type 73 type 140 type
Indoor side
1 = 30 m 5 = 2 m
2 = 5 m 6 = 6 m
3 = 5 m 7 = 5 m
4 = 5 m
LD = ø15.88 m (Total capacity of indoor unit is 53.3 kW)
LE = ø12.7 m (Total capacity of indoor unit is 37.3 kW)
LF = ø9.52 m (Total capacity of indoor unit is 21.3 kW)
4: ø9.52
3.5 kg
6.4 kg
6.4 kg
Total 16.3 kg
26.137 kg
16.3 kg
: 9.9 kg
: 9.9 kg
: 9.9 kg
: 42.437 kg
: 72.137 kg
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