23
Indoor
unit
Indoor
unit
Outdoor
unit
Branch
pipe B
Branch
pipe C
Main
pipe A
Optional
distributing pipe
Multi-distributor
30 m or less
1 m or less
Synchronized twin
Indoor
unit
Indoor
unit
Outdoor
unit
Branch
pipe B
Branch
pipe D
Indoor
unit
Branch
pipe C
Main
pipe A
Optional
distributing pipe
Multi-distributor
30 m or less
1 m or less
Synchronized triple
1. Keep Stop valve in outdoor unit fully closed (as it is shipped), and after completing refrigerant piping connection, conduct air
purge from service port of stop valve at outdoor unit.
2. After air purging, make the valve rod of stop valve at outdoor unit fully open.
Now refrigerating cycle is complete between indoor and outdoor unit.
Handle stop valve following the indication on outdoor unit.
Caution:
• Be sure to apply refrigerating oil to flare sheet face. Never apply it to screws. (As it causes flare nut loosening.)
• Use double spanner for piping connection.
• Be sure to check gas leak by using leak detector or soapy water.
• Use attached parts for refrigerant piping to provide correct insulation to the connection of indoor unit side in accordance with
attached explanation sheet.
• Be sure to provide anoxidized brazing.
(b) Adjusting the amount of refrigerant
(i) In case of RP 3 twin
Check the additional refrigerant to be charged referring to table 2 when using pipe of size referred in table 8.
(ii) In case of RP4 - 6 twin or RP6 triple
When using liquid pipe one size larger than standard diameter for main pipe A, calculate the amount of additional
refrigerant referring to
2
below.
1
When using piping of standard diameter or gas pipe one size larger than standard diameter for main pipe A.
Check the additional refrigerant to be charged referring to table 2 like 1:1 system.
2
When using liquid pipe one size larger than standard diameter for main pipe A.
[In case of RP4-6 using liquid pipe of
[
12.7]
• When total length of extension pipe (main pipe and branch pipe) is less than 20 m.
No adjustment is required for refrigerant. (Chargeless)
• When total length of extension pipe (main pipe and branch pipe) is more than 20 m.
Calculate the amount of additional refrigerant, referred to as W (g) in the following, using the equation below and add
proper amount of refrigerant. If W is less than or equal to 0, no additional charge is required. (Chargeless)
[Additional refrigerant]
W (g) = {100(g)
✕
L1} + {60(g)
✕
L2} + {30(g)
✕
L3} - 2000(g)
Note: Put “0” in L1-3 if it is not used.
L1: Liquid pipe length of
[
12.7 (m)
L2: Liquid pipe length of
[
9.52 (m)
L3: Liquid pipe length of
[
6.35 (m)
(c) Capacity correction
Apply pipe length between indoor and outdoor unit which is the longest of all for the calculation of capacity lowering according
to each pipe length.
OCT04A-1.qxp 04.9.29 9:14 AM Page 23
