Priming A Double Pipe Sub-Gravity Feed Systems And Single Pipe Suction Lift With De-Aerator; Riello Rdb Burners; Appliance Lockout Indicator On; Burner Commissioning Check - Bosch Worcester Greenstar Utility 32/50 Installation, Commissioning And Servicing Instruction Manual

▶ Allow the burner to run through to lockout indicated by the
illumination of the lockout indicator/reset button [4].
If no oil comes out of the port valve A, then re-prime the oil line.
▶ Wait 2 minutes then press the lockout reset button [4].
▶ Repeat the procedure until a steady stream of oil without air, runs
from the bleed port, then lock the bleed port [1].
▶ Safely dispose of the container/discharge.
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2
Fig. 39
[1] Bleed & pressure gauge port
[2] Pressure adjustment
[3] Vacuum gauge port
[4] Lock out indicator / Reset button
[5] Air shutter setting
6.4.2 Priming a double pipe sub-gravity feed systems and single
pipe suction lift with de-aerator
Refer to figure 40:
NOTICE: Oil pump damage
▶ Prime the oil supply pipework to ensure that the oil
pump does not run dry.
▶ To prime a de-aerator [2], disconnect the flexible oil inlet hose [7]
from the isolation valve and place in a container of kerosene [6].
Connect a spare flexible oil hose [5], to discharge into container [6].
Open the isolating valve, turn on the power to the appliance and set
the programmer to ON. Prime the de-aerator until there is a steady
flow of oil into container [6]. Turn off the appliance then reconnect
the flexible oil inlet hose [7].
▶ Turn on the appliance, the oil level in the de-aerator will drop as the
oil is used until the oil is drawn from the tank. If the de-aerator
empties and the burner locks out before the oil is drawn from the
tank, prime the de-aerator again.
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3
4
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Fig. 40 Priming the pump
[1] Oil supply
[2] De-aerator
[3] Return
[4] Flow
[5] Spare flexible oil hose
[6] Container of oil
[7] Oil pump flexible inlet hose
[8] Bleed and pressure gauge port
Greenstar Utility ErP - 6 720 821 751 (2018/04)
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5
6720821751-37.1Wo
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6.4.3

Riello RDB burners

2. Fit a suitable pressure gauge to the port [1] on the oil pump.
Refer to tables 13 & 14 for the settings
▶ Adjust the air shutter [5], turn the appliance on and then adjust the
pump pressure [2]. The burner should ignite following a pre-ignition
period of approximately 15 seconds.
6.4.4

Appliance lockout indicator on:

Refer to figure 39
If the burner fails to establish a normal firing pattern or flame failure
occurs the flame monitoring photocell mounted in the burner body will
alert the burner control box to shut the burner down and provide a safe
lockout state indicated by the illumination of the lockout indicator/reset
button [4].
▶ Wait 2 minutes then press the lockout indicator reset button [4] to
initiate another start sequence.
▶ Repeat procedure until a flame is established.
3. Start and run for three minutes then switch off.
▶ Release the burner retainer.
▶ Remove the burner from the appliance.
▶ Check for after-spurting from the nozzle, indicated by oil saturation
on the combustion head.
If after-spurting occurs:
Removing the combustion head and nozzle
▶ Refer to section 7.4.5 "Combustion head
maintenance and nozzle replacement" to access the
nozzle.
▶ Remove the combustion head from the burner to expose the nozzle.
Hold the burner vertical to unscrew the nozzle and fill the nozzle
holder with kerosene.
▶ Refit the nozzle, combustion head and burner.
▶ Restart and run for three minute intervals until after-spurting stops.
6.4.5

Burner commissioning check

4. Start and run for 20 minutes.
▶ Remove sampling point plug [1] to check the smoke reading is
between 0-1. If the smoke level is above 1, check the combustion
settings are correct and the oil nozzle is in good condition.
Smoke readings may be inaccurate until the smoke from
burning organic binder in the access door insulation has
ceased.
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1
Fig. 41
▶ Check the CO levels and adjust the air shutter (refer to figure 39
2
item [5]) setting according to tables 13 & 14 on page 30.
▶ Check the flue gas temperature is close to the values shown in
tables 13 & 14 on page 30.
If the flue gas temperature is too high and the baffles are correctly fitted,
then reduce the oil pump pressure (refer to figure 39 item [2])
5-10 p.s.i.(0.35 - 0.67 bar) to compensate for nozzle variations.
▶ Turn off the electrical supply.
▶ Isolate the oil supply to the burner.
▶ Remove the oil pressure gauge.
Commissioning
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