18
4
2
3
1
3
1
2
4
4
2
3
1
3
1
2
4
For 8 HP
For 10 HP
For 12 HP
For 14/16 HP
1
Suction tube
2
Discharge tube
3
Liquid tube
4
Balance tube
(For 8 HP)
Use a hex
wrench (width
5mm) and turn to
the left to open.
(For 10 HP)
Use a hex
wrench (width
8mm) and
turn to the left to
open.
(For 12/14/16 HP)
Use a hex
wrench (width
10mm) and
turn to the left to
open.
(For 8/10/12 HP)
Use a hex
wrench (width
4mm) and turn to
the left to open.
(For 14/16 HP)
Use a hex
wrench (width
5mm) and
turn to the left to
open.
Use a hex
wrench (width
4mm) and turn to
the left to open.
Use a flathead
screwdriver and
open by turning
the part with the
screw groove to
the right, from
“ –” to “ | ”.
5
Refrigerant charge connection port (width 15mm)
Tightening torque : 9±1 N · m
1-15. Example of Tubing Size Selection and Refrigerant Charge Amount
Additional refrigerant charging
Based on the values in Tables 3, 4, 5, 6, 9, 10 and 12, use “the liquid tubing size and length” and “the discharge tubing size and length”,
and calculate the amount of additional refrigerant charge using the formula below.
Unit of account (
g
)
Required additional
refrigerant charge (
g
)
=
Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit
+ 366 × (a) + 259 × (b) + 185 × (c) + 128 × (d) + 56 × (e) + 26 × (f)
+ 126 × (A) + 89 × (B) + 71 × (C) + 55 × (D) + 41 × (E) + 31 × (F) + 21 × (G) + 12 × (H)
(a) : Liquid tubing
Total length of ø22.22 (m)
(A) : Discharge tubing
Total length of ø38.1 (m)
(b) : Liquid tubing
Total length of ø19.05 (m)
(B) : Discharge tubing
Total length of ø31.75 (m)
(c) : Liquid tubing
Total length of ø15.88 (m)
(C) : Discharge tubing
Total length of ø28.58 (m)
(d) : Liquid tubing
Total length of ø12.7 (m)
(D) : Discharge tubing
Total length of ø25.4 (m)
(e) : Liquid tubing
Total length of ø9.52 (m)
(E) : Discharge tubing
Total length of ø22.22 (m)
(f) : Liquid tubing
Total length of ø6.35 (m)
(F)
: Discharge tubing
Total length of ø19.05 (m)
(G) : Discharge tubing
Total length of ø15.88 (m)
(H) : Discharge tubing
Total length of ø12.7 (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 not charged as prescribed amount, charge from the refrigerant charge connection port while operating in the cooling mode.
(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
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.
5
5
5
5
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2022/9/19 9:27:17
