Aztec EB 897 01 Installation Instructions Manual page 23

HIGH LIMIT THERMOSTAT REPLACEMENT
1. Ensure electrical supply is isolated to boiler
2. The high limit thermostat can be found fixed to top
front face of boiler.
3. Remove 2 terminal connectors from high limit
thermostat loosen retaining straps and slide
thermostat out from behind.
4. Important when replacing thermostat ensures a heat
sink compound is used between back of thermostat
and face of boiler. (See diagram for positioning)
5. Inspect retaining straps and replace where necessary.
THERMISTOR REPLACEMENT
1. Isolate electrical supply to boiler.
2. Thermistor is located fixed to top front of boiler
above high limit thermostat.
3. Disconnect from PCB board and slide out from
behind retaining strap.
4. Important when replacing thermistor ensure a heat
sink compound is used between thermistor and boiler
body. (See diagram for positioning)
5. Inspect retaining strap and replace where necessary.
6. When replacing front casing, ensure the thermostat
control shaft passes through hole in front control panel.
45
60
Supplied By www.heating spares.co Tel. 0161 620 6677
ELEMENT REPLACEMENT
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Remove bottom element positioning bracket.
11. Remove damaged element.
12. Refit in reverse order ensure element seals are fitted.
13. Check for continuity through two terminals on each
IMPORTANT
Inspect all seals and change where necessary
COOLING FAN REPLACEMENT (9, 11 & 12 kW
MODELS ONLY)
1.
2.
3.
4.
5.
6.
Thermistor
7.
Jubilee Clip
Limit
8.
Stat
9.
10. Re-fit in reverse order _ on re-assembly always
NOTE:
FIG. 23 FIG. 23
19
Isolate electrical supply to boiler.
Drain down system.
Disconnect terminal connectors from high limit thermostat.
Remove thermistor from behind retaining strap.
Disconnect electrical elements and earth wire.
Disconnect compression fitting top and bottom of boiler.
Remove securing bracket on bottom of boiler then
carefully remove top bracket.
Boiler unit can now be carefully removed.
Remove eight fixing screws on top flange and with
draw element assembly.
element.
Ensure electrical supply is isolated to boiler.
Remove the four casing screws (2 at top/2 at bottom)
lift up the top casing and carefully slide off the
front casing panel.
Taking note of which cable goes to which element,
disconnect all elements apart from the rear element.
Remove the grey pipe insulation, after pipe insulation
is removed it is now possible to disconnect the
remaining element.
For ease of access disconnect the mains input cable
from the main terminal block, also disconnect the
pump cable from its terminal block.
Now unscrew the two terminal block fixing screws,
freeing the pump terminal block from the back panel.
Remove both the screws holding the fan cover
(situated just behind the flow pipe).
Now lift out the cover from the LHS of the appliance.
Noting its position remove the fan by disconnecting
the plug from PCB and removing all 2 fixing screws.
refer to wiring diagram.
Ensure that the fan is fitted in the correct
orientation (label to face front of boiler).