VOKERA Maxin 24e, Инструкция по установке и обслуживанию

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18
MAXIN 24e & 28e
6.5.6 In the event of the boiler going to lockout
depress the lockout reset button. The two
main causes of the boiler going to lockout
during commissioning are electrical supply
polarity reversed, or air in the gas supply.
Check polarity and that the gas supply is
completely purged of air and that gas is
reaching the boiler then repeat from 6.5.2.
6.6 Checking Burner Pressures
6.6.1 The heat inputs for high and low gas rates
are factory set to the maximum values given
in section 3.12 for domestic hot water and
central heating but it is necessary to check
them when commissioning.
6.6.2 The maximum heat input for the central
heating mode may be reduced by a simple
adjustment to suit the system load. This in no
way affects the appliance maximum which is
always obtained in the domestic hot water
mode.
6.6.3 Turn off the main electricity supply. Gain
access to the interior as instructed in 5.7.2.
6.6.4 Locate the main burner pressure test point
(Fig. 20) and slacken the screw half a turn
in an anti clockwise direction. Attach a
suitable pressure gauge. Turn on electricity
supply and fully open a domestic hot water
tap to operate boiler in dhw mode. Adjust
hot water control knob to it's maximum
setting.
6.6.5 The pressure reading for maximum rate
should be.
24e (N/G)
10.1mbar
(plus or
minus 1.0mbar)
28e (N/G)
10.1mbar
(plus or minus 1.0mbar)
If the pressure is wrong it should be adjusted
as instructed in clause 8.23 (N.B. Whenever
the maximum rate is adjusted check and
adjust the minimum rate too)
6.6.6 Reduce the domestic water flow rate to
approx. 3-4 litres/min, turn the domestic
control knob slowly to minimum the boiler
output will reduce to the minimum setting. If
low flame cannot be established in this way,
turn off the electricity supply, release the
modulator coil retaining clip and slide the
modulator coil off the brass rod. Switch on
the electricity supply, the boiler will now light
at the minimum setting.
6.6.7 When low flame is established, the pressure
reading should be:
24e (N/G)
1.5mbar
(plus or minus 0.15mbar)
28e (N/G)
1.3mbar
(plus or minus 0.13mbar)
If it is different adjustment should be made
in accordance with the instructions in 8.23.
6.6.8 If the modulator coil was removed to check
the minimum setting, turn off the electricity
supply and replace the modulator coil
ensuring correct location of clip
6.6.9 Checking Ignition Heat Input (Soft Light
Ignition).
6.6.10 The soft light ignition pressure is factory set,
but it is necessary to check it when commis-
sioning.
6.6.11 Turn off the main electricity supply.
6.6.12 Disconnect the sensing electrode lead from
the terminal on the ignition control box (lead
towards the rear going to left side of main
burner).
6.6.13 Turn on the main electricity supply and turn
on a domestic hot water tap to operate the
boiler in dhw mode.
6.6.14 The boiler will now light at a reduced pres-
sure, the reading should be 4.0mbar (plus or
minus 0.4mbar) (N/G) If the pressure is
incorrect it should be adjusted as in 8.23.
N.B. While checking the soft light pressure
the burner will only light for approximately 10
seconds before going to lockout.
6.6.15 Turn off the main electricity supply and
reconnect the sensing electrode lead to the
ignition control box.
Retaining Clip
Fig. 20
Main Burner
Test Point
Incoming Gas
Pressure Test
Point
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.
Fig. 21
Range rating
potentiometer