VOKERA Maxin 24e, Инструкция по установке и обслуживанию

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MAXIN 24e & 28e
8.23 Setting Gas Pressures
ALL SETTINGS DONE WITH “U” GAUGE
FITTED TO BURNER TEST NIPPLE AS
INSTRUCTED IN CLAUSE 6.6
8.23.1 Setting Maximum Rate
Turn off electrical supply to boiler and follow
instructions in section 8.4 to gain access.
Refer to Fig. 34.
Disengage retaining clip at rear of coil.
Remove the modulator coil from the brass
shaft.
Screw fully in by hand the minimum rate
adjusting screw in a clockwise direction.
Loosen the locknut on the brass sleeve.
Turn on the electricity supply and the appli-
ance mode selector switch to Turn on fully
a domestic draw off tap.
The boiler will now light at full flame, if not
screw the brass sleeve slowly clockwise until
the burner lights.
Adjust the brass sleeve until the correct pres-
sure is obtained on the gauge. The correct
reading should be:
24e (N/G)
10.1 mbar / 3.9 in w.g.
plus or minus 1.0 mbar / 0.39 in w.g.
28e (N/G)
10.1 mbar / 3.9 in w.g.
plus or minus 1.0 mbar / 0.39 in w.g.
Tighten the locknut ensuring that the reading
does not change.
8.23.2 Setting Minimum Rate (DHW)
Turn the minimum adjusting screw anti clock-
wise until the minimum gas pressure is
achieved the correct reading should be:
24e (N/G)
1.5 mbar / 0.59 in w.g.
plus or minus 0.15 mbar / 0.05 in w.g.
28e (N/G)
1.3 mbar / 0.51 in w.g.
plus or minus 0.13 mbar / 0.05 in w.g.
Reassemble the modulator coil on the brass
sleeve relocating the retaining clip.
8.23.3 Setting Minimum Rate (C/H)
Turn off the hot water draw off tap and turn
the mode selector switch to the posi-
tion, ensure that the room thermostat and/
or timeclock (if fitted) are calling for heat.
Turn the "range rating" potentiometer fully
anti-clockwise (see fig. 21).
The gas pressure should now be:
24e (N/G)
1.9 mbar / 0.74 in w.g.
plus or minus 0.19 mbar / 0.07 in w.g.
28e (N/G)
1.6 mbar / 0.62 in w.g.
plus or minus 0.16 mbar / 0.06 in w.g.
If the reading is incorrect it should be adjusted
as follows:
With the boiler still in central heating mode
and the burner at the minimum rate, using a
small screwdriver turn the left hand potenti-
ometer fig. 35 clockwise to increase & anti-
clockwise to decrease the C/H minimum gas
pressure.
When all is adjusted, refer to cl. 6.6.16 for
details on recalibrating the range rating po-
tentiometer.
8.23.4 Setting Ignition Heat Input (Soft Light Ig-
nition)
Turn off the main electricity supply.
Disconnect the sensing electrode lead from
the rear terminal on the ignition control box.
Turn on the main electricity supply and turn on
a domestic hot water tap to operate the boiler
in dhw mode.
The boiler will now light at a reduced pressure,
the reading should be:
4.0mbar / 1.6in wg
plus or minus 0.4mbar / 0.16in wg (N/G)
If the pressure is incorrect, using a small
screwdriver adjust the potentiometer fig. 35
until the reading is correct.
N.B. While checking the soft light pressure
the burner will only light for approximately 10
seconds before going to lockout.
If the setting has not been completed in this
time depress the ignition reset button which
will be illuminated and repeat the procedure
again.
When adjustments are complete, turn off the
main electricity supply and reconnect the
sensing electrode lead to rear terminal on the
ignition control box.
8.23.5 Central Heating (Range Rating) to Set
Maximum Rate in Central Heating Mode.
See clause 6.6.16 for necessary adjustments.
Refer to the commissioning rate recorded by
the commissioning engineer on the boiler
badge.
8.24 End of Servicing
Run through the general commissioning as
described in Section 6 as far as they apply.
Refit casing and clean up.
C/H Min. Rate Soft Light
Fig. 35
NOTE: Potentiometers located on main p.c.b. on
front control panel. Access to p.c.b. is obtained by
removing the four cover securing screws.