1-13. Example Of Tubing Size Selection And Refrigerant - Panasonic U-8ME1E8 Installation Instructions Manual

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
refrigerant charge (kg)
(a) : Liquid tubing Total length of ø22.22 (m)
(b) : Liquid tubing Total length of ø19.05 (m)
(c) : Liquid tubing Total length of ø15.88 (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.
CAUTION
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
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.
=[366 ×(a) + 259 ×(b) + 185 ×(c) + 128 ×(d) + 56 ×(e) + 26 ×(f)] ×10
additional refrigerant charge per outdoor unit.
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.
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.
18 ~ 20 hp types 5 mm
(d) : Liquid tubing Total length of ø12.7 (m)
(e) : Liquid tubing Total length of ø9.52 (m)
(f) : Liquid tubing Total length of ø6.35 (m)
Turn 90 degrees to the left.
Fully closed (at shipment)
How to turn the tub
(10 ~ 20 hp types)
15
–3 + Necessary amount of
Fully open