andrews 24/39, Installation And Service Manual

Page: 50 / 116

50 Issue 2 14/07/16
6 Servicing
6.10 Magnesium anode(s) all models
Magnesium sacrificial anode(s) is (are) fitted to the top of the
storage vessel.
The anode(s) will prevent corrosion of the storage vessel. Anode
condition should be checked annually and replaced if excessive
wear is present. We recommend that the anode(s) are replaced
annually.
1. Withdraw each anode using a 1
1
⁄
16
in AF socket spanner. A
new anode measures 21mm diameter.
2. An anode should be replaced, if, at any point along it's
length, the diameter is reduced to half, or less of original.
Particular attention should be paid to the ends.
3. If the anode is encrusted with limescale, it should be either
wire brushed to reveal bright metal or replaced.
6.11 Safety valve HIflo models
Check the condition and operation of the safety valve as
described below.
During Servicing
Examine the safety valve for deposits or let-by. Clean or replace
as necessary.
When Re-Commissioning
Operate the safety valve, ensuring no let-by when the valve is
reset and reseated.
6.12 Restart all models
Re-light and carry out commissioning checks as detailed in
Section 4, Commissioning. Set the thermostat control to the
required user setting.
Note
Where Correx
TM
anodes are fitted, no maintenance is
necessary.
Note
For adjustable valves, reduce the rating until the valve
operates and gives full flow. Reset the valve and check
for let-by. For lever operation valves, operate lever and
check for let-by when reseated.