REMEHA Gas 550 Technical Information page 17

12. Set the correct full load burner pressure by means
of the pressure regulator on the gas multibloc gas
valve(see Fig. 10, pos. 1).
Warning: When the required burner pressure can
not be reached because of low inlet pressure, ensu-
re that the pressure regulator remains within it's
operating range.
Now do the following:
• Set the burner pressure to the highest possible
value (but not over the required full load burner
pressure).
• Turn the pressure regulator anticlockwise until the
burner pressure is affected.
• The burner pressure is now limited, this will pre-
vent the boiler from being over gassed should the
inlet gas pressure increase.
13. Set the correct part load burner pressure:
• Turn the high/low thermostat to it's minimum set-
ting (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. 10, pos. 2).
• To check the 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. 10, pos.3) 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 neces-
sary re-adjust.
14. Adjustment of the gas pressure switch LD (optional):
• Switch the boiler to full load.
• Connect a pressure gauge to measuring point LD.
• Turn the adjustment disc of the pressure switch to
it's minimum setting.
• Now close the main gas cock slowly until the inlet
pressure drops to the value detailed in the docu-
mentation supplied with the gas pressure switch.
• Slowly turn the adjustment disc of the pressure
switch until the pressure control operates.
• The control box shuts down the gas supply and
will restart.
15. Adjustment of the gas pressure switch HD (optional):
• Switch the boiler to full load.
• Connect a pressure gauge to manifold.
• Set the pressure switch to the value detailed in
the documentation supplied with the gas pressure
switch.
• Check whether the gas pressure switch HD comes
to action at the set value by increasing (Fig. 10,
pos.1) the full load burner pressure to that value.
The boiler will lock out.
• Reset by pressing the reset button on the gas
Supplied By www.heating spares.co Tel. 0161 620 6677
pressure switch HD. The boiler will resume opera-
tion.
• Set the correct full load burner pressure again
according §10.2.12.
16. Valve leakage control (optional)
• Remove plug Pa during boiler start up (see §10.2.
9).The plug Pa is located opposite the valve lea-
kage control on the multibloc.The boiler will lock
out.
• Reset by pressing the reset button on the valve
leakage control.The boiler will resume normal ope-
ration.
17. Check the thermostats for the correct operation set-
ting.
18. 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 opera-
tion, the pilot gas valve must close immediately.
The boiler will lock out.
• Reset by pressing the reset button on the control
box.
19. 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
20. Check the down draft thermostat by pressing the
bimetallic strip on the thermostat. The boiler will shut
down for 3 minutes. After that the boiler will resume
operation.
21. Send the initial commissioning report CE to Broag.
17