13
13. Set the correct
part load burner pressure
:
•
Turn the High/Low thermostat to its minimum
setting
(35°C). When the flow temperature is
over
35°C, the boiler will burn at part load.
•
Set the part load burner pressure by turning the
adjustment ring (
fig. 09, pos. b
).
•
To check the high fire setting: Turn the High/Low
thermostat to 85°C and check the full load
burner pressure (if necessary re-adjust).
The speed of opening of the main gas valve can
also be adjusted to ensure a smooth light up. Set-
ting the hydraulic brake on the main gas valve as
follows:
•
Remove the setting cap (
fig. 09, pos. c
) and turn
it upside down on the hydraulic brake.
•
Turn it clockwise to slow down, anticlockwise to
speed
up.
•
Check both burner pressures again and if
necessary
re-adjust.
14. Check the
thermostats
for the correct operation
setting.
15. Check the
flame control on the control
box
•
Start the boiler with disconnected ionisation
probe, after the ignition phase the pilot gas
valve must close. The boiler will lock out.
•
Reset by pressing the reset button on the
control
box.
•
Then disconnect the ionisation probe during
operation, the pilot gas valve must close imme-
diately. The boiler will lock out.
•
Reset by pressing the reset button on the
control
box.
16.
Water level control
:
•
Check the water level.
•
Check the operation of the water level control by
disconnecting the electrode. The boiler should
go to lock out
•
Create a shortcut between the electrode and
earth. The boiler should go to lock out
•
Reset by pressing the reset button on the instru-
ment
panel.
The boiler will resume operation
17. Check the
down draught thermostat
by pressing
the bimetallic strip on the thermostat. The boiler will
shut down for 3 minutes. After that the boiler will
resume operation.
18. Send the initial commissioning report CE to Broag.
a
c
b
fig. 09
Dungs MB-ZRDLE 410/412 B01 S52
a. Pressure
regulator
b. Part load adjustment ring
c. Hydraulic brake (setting cap)
10.2 Switching off the boiler
1. Set boiler controls to OFF
2. Allow system to cool
3. Switch off the electric supply
4. Turn off the gas cock.
Warning:
The boiler can be damaged, when the tem-
perature falls below freezing point and it is switched off
and full of water.
Note:
Commissioning must only be carried out by a qualified
engineer with the relevant product training and certifica-
tion i.e. Acops - Corgi. A commissioning data sheet / log-
book must be completed on site for issue to owner.
