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NOTE: On no account should a metal scraper be
used to remove deposits since this may result in
damage to the glass lining.
After cleaning, replace the inspection door and gas-
ket.
9.3 INSPECTION OF MAGNESIUM ANODES
NOTE: On no account remove the magnesium
anodes without checking to ensure that the storage
tank is isolated on flow, feed and circulation water-
side connections.
Each storage tank includes sacrificial magnesium
anodes. See figures 2.2 & 2.3.
Release the nuts securing the magnesium anodes
(this
will
require
(ST750/1000) and 27mm (ST300/500) complete with
extension bar) and withdraw the anodes vertically
through the ¾" BSP sockets and clear of the storage
tank. Remove the copper anode sealing washer and
inspect each anode for erosion. If the extent of ero-
sion is sufficient to have reduced the cross-sectional
area of the anode by fifty percent I.e. the diameter of
the anode is less than 15 mm, it should be replaced
complete with a new sealing washer.
9.5 RECOMMENDED SPARES.
SPARES ITEM
3/4 BSP Magnesium Anode ST300 & ST500
1 1/4 BSP Magnesium Anode ST750 & ST1000
Insulation Jacket ST750
Insulation Jacket ST1000
Top Cover ST750
Top Cover ST1000
Thermometer (gauge)
Clean out door gasket pre May 2012 (ST300 & ST500)
Clean out door gasket pre May 2012 (ST750, ST1000)
Clean out door gasket post May 2012 Rubber type (ST300 to ST500)
Clean out door gasket post May 2012 Rubber type (ST750 & ST1000)
Potentiostat
Indicator lamp
Control thermostat
Temperature limiter
Fuse 2A
HAMWORTHY HEATING LTD
a
32mm
socket
9.4 ASSEMBLY - FOLLOWING COMPLETE SER-
VICING OF THE STORAGE TANK.
Close the storage tank drain cock and remove the
hose connection.
Open the cold feed, hot flow and circulation isolation
valves and allow the system to fill with water.
Check to ensure that there are no leaks from the in-
spection door sealing gasket, the magnesium anode
sealing washers and the drain cock.
Replace the insulation disc over the inspection door
flange and refit the exterior casing panel with the four
screws.
spanner
6
POWERSTOCK
PART No
573409004
539001109
533806158
533806159
533806156
533806157
557002006
531201041 Refer to Fig No 9.1
531201148 Refer to Fig No 9.1
531201182 Refer to Fig No 9.1
531201183 Refer to Fig No 9.1
533901345
533901346
533901178
533901343
747225834
500001177/I
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