Combustion Testing (All Models); Commissioning The Burner (Oil Heaters); Control - Oil-Fired Heaters - Roberts Gorden MOB Series Installation Manual

10.5.1 Main Gas Valves
Refer to the relavant Ecoflam burner and gas train
installation manuals supplied with your heater for the
position of the burner pressure regulator. This must
be used to set the burner pressure indicated in the
data tables in Section 4.
For two-stage, the Dungs gas valve, please refer to
the burner manufacturer's instructions for setting the
controls.
10.5.2 Throughput Adjuster
These valves have a throughput adjuster fitted to the
second main gas valve. Refer to the relavant
Ecoflam burner and gas train installation manuals,
supplied with your heater. When replacing a gas
valve, ensure that this device is set in the fully open
position by releasing the locking screw and turning
the "V MAX" fully counterclockwise towards the "+"
and then retightening the locking screw.
10.5.3 Rate of Opening
This device is a hydraulic damper which slows down
the rate of opening of the second main gas valve to
give a smooth main gas ignition. This is preset at the
factory at the slowest setting and will need no further
adjustment. If a new valve is fitted, then remove the
plastic screw on top and with a small screwdriver
turn the "V Start" screw fully clockwise towards the
"-" and refit the plastic cover.

10.6 Combustion Testing (all models)

Combustion quality must be tested to prove correct
heater operation. Incorrect results will indicate faults
with the installation or appliance.
Combustion testing must be carried out with all
covers in place. The flue gas is sampled in the flue,
within 1 meter of the heater. The values of CO2
should be between 9.5% and 10.0% for natural gas
and 11% for LPG, depending upon the model.
The CO will be up to 80 ppm (0.008%) dry, air free,
depending upon the model. Temperature rise of the
flue gases above ambient should be approximately
160°C to 180°C. Seal the sample test hole in the flue
after testing.
To alter combustion performance, open/close the
combustion air damper to reduce or increase these
values. Once adjusted to the optimum combustion
setting, lock the air damper into position.
Repeat the steps on Page 42, Section 10.2.3.
10.6.1 Pressure Switch
Setting of the pressure switch must only be
carried out as part of a complete commission
which includes combustion testing. For
adjusting the air pressure switch, see Ecoflam
instructions.
10.6.2 Complete the Commissioning
Ensure that all covers are fitted correctly and all test
points are properly sealed.

10.7 Commissioning the Burner (Oil Heaters)

Check all valves between the fuel tank and the
heater are open, including the fire valve.
Ensure that oil is available at the heater inlet and
that the air has been vented from the fuel pipe
installation. Vent the air by opening the bleed screw
on top of the fuel filter. On pressurised systems,
check that the installation is running at the correct
pressure. B.M. oil lifters will need priming.
10.7.1 Burner Settings
Ensure that the burner head and air damper settings
are adjusted for the correct burner and that the
correct atomising nozzle is fitted. See Page 13,
Section 4.7 and the burner reference number on the
data plate.
10.7.2 Preparation for Burner Pressure Test
Attach a pressure gauge 0-15 BAR (0 - 200 psi) to
the burner pump pressure test port. (See
manufacturer's information). A test manifold gives
you the facility for the connection of the pressure
gauge and the venting of the pump.

10.8 Control - Oil-Fired Heaters

For High/Low oil burners, follow the general
sequence as described below and also have extra
functional stages related to air damper positions.
Refer to the burner manufacturer's instructions for
further detail.
10.8.1 Description of Oil Fired Heater Control
The oil fired burners fitted to the heater are
controlled by a fully automatic control and
photoelectric flame monitor unit. This control
ensures the safe start, ignition and stop sequence
and also monitors the flame. If the flame should fail
the control will go into "lockout". The button on ther
front of the control will illuminate to indicate lockout.
Press the button to reset the control to restart the
burner firing cycle.
SECTION 10: C
OMMISSIONING
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