Daikin VRV II Series - Page 28

Installation Si39-303
22 General Information
c) Brazing
The Multi-System requires only copper/copper jointing and the jointing method is explained below.
!
The use of “hard solder” is essential.
The R410A Heat Pump RXYQ-M Series uses a wide range of piping sizes. You should therefore be careful
when selecting the nozzle tip. If a small nozzle tip is used for brazing piping of large diameters such as
φ
38.1 and
φ
44.5, brazing flow becomes poor.
Table 1: Correlation of nozzle tip and size of refrigeration piping
Note:
The values in the table above are for type B torch (French).
6.4
9.5
12.7
15.9
19.1
22.2
25.4
28.6
31.8
34.9
38.1
41.3
Nozzle tip No.
1.6 2.4 3.2
(V0977)
Piping size
# 200 # 225 # 250 # 315 # 400 # 450 # 500
Brazing filler diameter φ