41
the display and the boiler runs
at minimum power.
4. With the SHUTTER (5 fig. 25) fully
open, adjust the OFF-SET (6 fig.
25) to obtain the first pressure
value shown in Table 1 - OFF-SET
column, ensure that the value is
correct for the gas being used.
If these figure are not obtainable
(low), confirm that the working
inlet gas pressure is correct.
5. Press the
button, the boiler
will increase to maximum power.
6. Close the SHUTTER (5 fig. 25) to
obtain the second pressure rea-
ding indicated in Table 1 – SHUT-
TER column.
7. Once t hese adjus tments have
b e e n o b t a i n e d , a c o m b u s t i o n
check (flue gas analysis) must be
done. See section 4.3.2.
8. Press the
button to return the
boiler to minimum output.
9. Now connect the flue gas analy-
ser.
10.Check the analyzer CO2/Ratio
and compare to values reported
in Table 1. Make any final adjust-
ments by small
adjustments to
the OFF-SET screw (6 fig. 25),
allow time for the analyser to
respond to the adjustments.
11. Press the
button, the boiler will
move to maximum output. Verify
that the CO2/Ratio. Make any
final adjustments by small adjust-
ments to the SHUTTER (5 fig.
25) allow time for the analyser
to respond.
12. Recheck the low reading by pressing
the
button.
13. Press the Standby key to exit.
14 . Re m o v e t h e m a n o m e t e r a n d
analyser, close the test points,
and check for tightness.
– Check for gas tighhtness.
6.12
PRINTED CIRCUIT BOARD (PCB)
– Isolate from power supply
– Remove screw securing control panel
– Lower panel to horizontal position
– Remove PCB covers
– Disconnect all wiring
– Remove PCB fixing screws
– Ensure any PCB links are matched to
old board
– Reset PAR 1 and PAR 2 as per the
table 3.3.1
– Refit in reverse order
– Recommission boiler.
6.13
PUMP MOTOR
– Turn off power supply
– Remove boiler cover
– Isolate flow and return valves
– Drain boiler using drain vent
– Remove plug connection
– Remove 4 x fixing screws, catch any lost
water
– Refit in reverse using new gasket.
6.14
DHW EXPANSION VESSEL
- Turn off power supply
- Remove boiler covers
- Isolate DHW supply
- Drain the cylinder
- Disconnect the DHW expansion vessel
- Check the pressure of the new cylinder
(3 bar)
- Refit in reverse order
6.15
SACRIFICIAL MAGNESIUM
ANODE
This is located in the base of the cylinder.
- Turn off the power supply
-
Turn off the domestic water supply to
the boiler.
- Open a DHW tap.
- Connect a suitable drain hose to the
cylinder drain cock.
- Open the drain cock.
-
When fully drained, remove and examine
the anode.
- If required replace the anode.
- Refit in reverse order
- See section 2.4.2 for refilling instruc-
tions.
