Ravenheat RSF 82E, Installation And Servicing Instructions

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6.7
6.9
LIGHTINGTHE BOILER (Fig. 50)
Before lighting the main burner make sure
that the heating circuit flow and return
valves are open and also that the cold water
input cock is also open.
- If external controls are installed (e.g.
timeclock and thermostat) make sure
that they call for heat.
- Turn summer/winter selector switch 1 to
w i n t e r
- Turn control thermostat 4 up to its
maximum setting.
- Now the main burner should turn on.
With leak detection fluid test for gas
soundness of all gas components and
joints.
- See paragraph 6.14 for regulating the
heating circuit thermostat.
Check gas mains pressure (Fig. 52). Fit
a gas pressure gauge on pressure inlet
77 (Fig. 51) on the gas valve, after
releasing the seal screw.
Check the gas mains pressure with
boiler operating.
Check with the Local Gas Supplier if the
pressure differs significantly from 20
mbar.
CHECK THE GAS PRESSURE AT THE
BURNER
Now check if the maximum gas pressure at
the burner is equal to 8.1 0.5 mbar (3.2
0.2 in w.g.) for RSF 82E - RSF 82ET.
To do this proceed as follows:
- Turn off main switch 1 (Fig. 50)
- S e t m a i n s w i t c h o n &
- S e t c o n t r o l t h e r m o s t a t 5 a t i t s
maximum setting.
-Fit a pressure gauge, using a hose, to
pressure test point 81, (Fig. 51), after
first loosening its close-off screw.
-Open one or more hot water taps so
that at least 10 11.4 litre of water flows
per minute.
- The pressure indicated on the pressure
gauge is the maximum operating gas
pressure.
- C h e c k i f t h e m i n i m u m p r e s s u r e
corresponds to 1.5 mbar (0.6 in w.g.)
RSF 82E - RSF 82ET as is set at the
factory.
Detach one of the wires going to
modulator 104 (Fig. 51) and make the
boiler operate just as’ was done for
checking the maximum pressure.
Observe the pilot flame which will light a
second before main burner. It should be
about 20 mm long (Fig. 528) and envelop
the spark electrode tip.
6.10 ADJUSTING MINIMUM AND MAXIMUM
PRESSURE (Fig. 51) SIT-HONEYWELL
GAS VALVE
- Remove cap covering modulator to gas
valve.
- Detach one of the cables connected to
the modulator 114.
- 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.
6.11 RECONNECTTHE DETACHED CABLE
Use a screw-driver to hold nut 111 firm
(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 adjustement turn off D.H.W.Taps.
6.12 S E T T I N G C E N T R A L H E A T I N G G A S
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).
- Select (winter) switch position
- Turn control thermostat 4 to maximum
setting (Fig. 50).
- Check all external controlsare on and
calling for heat ensure all D.H.W. taps’
are off.
- With boiler operating use a screwdriver
to turn potentiometer (Fig. 48) clockwise
to increase pressure and anti-clockwise
to decrease pressure.
- T o o b t a i n t h e d e s i r e d h e a t v a l u e
establish 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.
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