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5.12.5 Pump priming
Before starting the burner, make sure that the tank
return line is not clogged.
Obstructions in the line could cause the sealing
WARNING
organ located on the pump shaft to break.
In order for self-priming to take place, one of the screw 4)
(Fig. 23) of the pump must be loosened in order to bleed off
the air contained in the suction line.
Start the burner by closing the remote controls.
Check the fan wheel rotation direction as soon as the burner
starts.
The pump can be considered primed when the light oil starts
coming out of the screw 4). Stop the burner and screw screw
4) in.
D9249
Key to layout (Fig. 23)
1
Suction
2
Return
3
Pressure switch attachment
4
Vacuum meter connection
5
Pressure governor
6
Screw for by-pass
7
Pressure gauge connection
PUMP SUNTEC TA5
Min delivery rate at 16,5 bar pressure
Delivery pressure range
Max. suction depression
Viscosity range
Light oil max. temperature
Max. suction and return pressure
Pressure calibration in the factory
The time required for this operation depends upon the diameter
and length of the suction tubing.
If the pump fails to prime at the first starting of the burner and the
burner locks out, wait approx. 15 seconds, reset the burner,
as often as required. After 5 or 6 starting operations allow 2 or 3
minutes for the transformer to cool.
Do not illuminate the QRI cell or the burner will lock out; the burn-
er should lock out anyway about 10 seconds after it starts.
20027766
Installation
Fig. 23
G 1/2"
G 1/2"
G 1/4"
G 1/4"
G 1/4"
560 kg/h
6 - 30 bar
0,45 bar
4 - 800 cSt
140 °C
5 bar
22-20 bar
24
The a.m. operation is possible because the pump
is already full of fuel when it leaves the factory. If
the pump has been drained, fill it with fuel through
WARNING
the opening on the vacuum meter 4) (Fig. 23) prior
to starting; otherwise, the pump will seize.
Whenever the length of the suction piping ex-
ceeds 20-30 meters, the supply line must be filled
using a separate pump.
5.12.6 Pressure regulator
The pressure variator (Fig. 24), integrated into the valve unit of
the oil circuit makes it possible to vary the pressure on return of
the nozzle depending on the flow rate required.
Governing of the pressure on return is obtained with the variation
of a section by rotating the servomotor 23) (Fig. 5) which simulta-
neously also controls the gas butterfly valve.
Pressure governor at 0° (maximum opening) minimum pres-
sure on nozzle return.
Pressure governor at 90° (minimum opening) = maximum
pressure on nozzle return.
The servomotor is operated by the electronic cam 4) (Fig. 6); by
means of this device it is possible to set different curves for oil
and gas on the same servomotor (the air gate valve servomotor
4) (Fig. 5) may be operated in the same way.
In adjusting with gas it is advisable to set the servomotor at
90° in order to reduce losses from the gas butterfly valve.
In adjusting with oil, setting is made depending on the type
of nozzle used and on the modulation required. Under the
conditions of minimum firing rate, 20° rotation may be suffi-
cient.
D3520
Key to layout (Fig. 24)
1
Nozzle delivery pressure gauge
2
Pressure gauge for pressure on nozzle return
3
Position indicator (0 ÷ 90) of pressure variator
4
Maximum oil pressure switch on return circuit
GB
Fig. 24
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