Ravenheat Flue Boiler Installation And Servicing Instructions - page 28
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6.11
- With the boiler operating use a screw
driver (HONEYWELL 9 mm spanner) to
turn the nut 111 clockwise to increase
pressure
and
anti-clockwise to
decrease pressure.
NOTE: LPG ONLY
The minimum pressure is factory set and
sealed, and cannot be adjusted.
RECONNECTTHE DETACHED CABLE
Use a screw-driver to hold nut 111
(HONEYWELL 9 mm spanner) and use a 10
mm spanner (HONEYWELL 7 mm spanner)
wrench to rotate the nut 110 clockwise to
increase the pressure and counter-clock-
wise to decrease it.
After adjustment turn off D.H.W. Taps.
Fig. 52B
6.12
SETTING CENTRAL HEATING GAS
PRESSURETHE BOILER COMES SET AT
MID POSITION RATING FOR USE ON C.H.
(table1)
When the boiler operates in the C.H. mode
the gas pressure at the burner can be set
between the min. and max. values.
This permits capacity to be adjusted to suit
system demand. If adjustment is required
proceed as follows:
- Remove the front panel and the panel
instrument as described in clauses
(sect. 5.4.1 and sect 5.4.3)
- Unscrew the two screws holding the
control box cover and lift off (Fig. 78).
- Turn on main switch 1 (Fig. 50).
- Turn control thermostat 4 to maximum
setting. (Fig. 50)
- Check all external controls are on and
calling for heat.
- With boiler operating use a screwdriver
to turn potentiometer (Fig. 48) clockwise
to increase pressure and anti-clockwise
to decrease pressure.
Once the process of commissioning the boiler is
complete, the commissioning engineer MUST
complete his section in the Benchmark log book.
6.13
CHECKINGTHE FLUE SYSTEM
- To obtain the desired heat value estab-
lish pressure as per (Fig. 52).
- Replace the protective cover.
- Once this pressure is established, mark
it up on data badge with adhesive red
label/arrow burner pressure setting so
that this can be referred to and checked
during future servicing.
RATIO BETWEEN BURNER PRESSURE
AND OUTPUT
6.13.1
The flue system should be visually checked
for soundness. Check all connections and
fixings are secure and tight.
6.14
CHECKINGTHE HEATINGTHERMOSTAT
6.14.1
Allow the system to warm up and then turn
the C.H. thermostat to ensure the main
burner modulates from ‘“high” to “low” and
“low” to “off” and vice versa (scale range
covers approx. 45
o
C - 85
o
C).
28