Cathodic Protection - Hitachi DHWT200E-2.5H1E Installation And Operation Manual

1 Cathodic protection

14
13.5 INTERNAL WIRING
Internal Wiring Connection
14 CATHODIC PROTECTION
In order to protect the inside of the vessel from corrosion all the
enamelled DHWT can be equipped whit a cathodic protection
unit, comprising magnesium sacrifice anodes, charge gauges
and wiring of connection.
It basically comprises a magnesium anode (1) mounted on the
storage tank's connection plate (2), connected to the external
anode load measured (3) which allow to know the anode con-
sumption rate without having to dismantle it.
The electrical connection of the load measured (3) to the anode
(1), is made through the wiring of connection (6):
- To the anode: U shaped terminal M10 (4)
- To the load measured: female Faston terminal 2.8 (10)
2
19 PMML0198A-rev.1 - 04/2011
The electrical connection of the load measured (3) to the earth, is
made through the wiring of connection (7):
-
-
• Check the magnesium anode load periodically by pus-
hing the button. If the gauge is in the red zone, the mag-
nesium anode must be replaced.
• Do not install the permanent cathode protection and the
cathodic protection together.
+
9
-
10
Anode-Control
3
OK
Test
Power cable
Control EH cable
Sensor DHWT cable
Detail D
To earth: U shaped terminal M10 (5)
To the load measured: female Faston terminal 6.3 (10)
C A U T I O N
1-4
2
3
7
6
8
5