3
•
Systems • VRVII & VRV-WII features
9
• VRVII & VRV-WII features
3
High reliability
3-1
Nr. 1 anti-corrosion treatment - VRVII
•
Special anti corrosion treatment of the heat exchanger provides 5 to 6 times greater resistance against acid rain and salt corrosion. The provision of
rust proof steel sheet on the underside of the unit gives additional protection.
Improvement in corrosion resistance
Performed tests
contents of 1 cycle (7 days):
•
24 hours salt spray test SS DIN 50021
•
96 hours humidity cycle test KFW DIN 50017
•
48 hours room temperature & room humidity
testing period : 5 cycles
contents of 1 cycle (48 hours):
according to DIN50018 (0.21)
testing period : 40 cycles
Corrosion resistance rating
Non-treated Anti-corrosion
treated
Salt corrosion
1
5 to 6
Acid rain
1
5 to 6
An anti-corrosion heat exchanger cutaway view
Hydrophilic film
Aluminium
Corrosion-resistant Acrylic resin
Heat exchanger
1 VDA Wechseltest
8
6
4
2
0
Corrosion resistance
Cycle
1 2 3 4 5
Daikin P.E.
Bare aluminium
2 Kesternich test (SO2)
10
9
8
7
6
5
4
3
2
1
0
Corrosion resistance
Cycle
1 2 3 4 5 6 10 20 30
40
Daikin P.E.
Bare aluminium
