Electric Heater - Hitachi DHWT200S-2.5H1E Betriebshandbuch

15 1 Titan protection accessory
15 TITAN PROTECTION ACCESSORY
All the Hitachi DHWT can be equipped with the permanent catho-
de protection system which is totally automatic and maintenance
free.
It basically comprises a titanium anode (1) mounted on the sto-
rage tank's connection plate (2) and connected to a potentiostat
(3) which automatically regulates the input current to the anode,
constantly measuring the potential of the storage tank), through
the leads (4). Wiring the anode to the potentiostat by means of
leads (4) is carried out in the following way:
- To the anode: connection (5), female Faston terminal.
- To earth: connection (6), U shaped terminal.
- To the potentiostat: connections at (9) and (10), pins (7)
and (8) respectively.
C A U T I O N
• Use original wires only. To avoid any risk of corrosion
due to reverse polarity do not lengthen nor shorten the
wires.
• Use a socket base near to the storage heater for this pur-
pose.The protective anode starts comes into operation
when the storage heater is full of water. When there is no
water the control pilot light (11) lights up red and blinks
on and off.

16 ELECTRIC HEATER

The electric heater is made of Incoloy alloy 825 and complies with the European Low Voltage Directive 2006/95/EC.
It comprises a flange that holds three U-Shaped heating elements for 2.5kw power resistances.
16.1 REPLACE ELECTRIC HEATER
The steps to be followed are:
1 Totally disconnect the unit from the main power supply.
2 With the help of a tool remove the heater to be replaced. Be
careful not to damage the enamel surface in case of ename-
lled tanks.
20
9
10
3
11
PMML0198A-rev.1 - 04/2011
• lf the pilot light (11) is green, this shows that the storage
heater is receiving a protective current. lf the pilot light is
not on or lights up red and blinks, check the connections,
contacts and mains supply. lf this anomaly continues,
contact the fitter or our Customer Technical Service De-
partment.
• In the case of vertically installed storage heaters from
which water is not going to be extracted for periods of
more than 3 months, we recommend fitting an automatic
purger at the D.H.W. outlet.
• lf the storage heater is installed horizontally, we recom-
mend the extraction of water at least once every 3 mon-
ths.
• The potentiostat (3) and connecting wires (4) must not be
disconnected, except when the storage heater is emptied.
• Do not disconnect the protection system during periods
of absense (holidays, etc.).
• Occasionally check that the pilot light is working co-
rrectly (11).
4 2
7
8
3 Insert the new heater in the same position as the old one.
4 Connect again and plug into the main power supply.
5 1
6