Daikin VRV II Series Design, Installation & Testing Instructions page 28

Installation
c) Brazing
The Multi-System requires only copper/copper jointing and the jointing method is explained below.
!
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
Table 1: Correlation of nozzle tip and size of refrigeration piping
# 200
6.4
9.5
12.7
15.9
19.1
22.2
25.4
28.6
31.8
34.9
38.1
41.3
Note:
The values in the table above are for type B torch (French).
22
The use of "hard solder" is essential.
φ
44.5, brazing flow becomes poor.
# 225 # 250
Nozzle tip No.
# 315 # 400 # 450
Si39-303
Brazing filler diameter φ
# 500 1.6 2.4 3.2
(V0977)
General Information