Cams And Trim Potentiometers Functions; Burner Starting; Fuel Oil Adjustment; Gas Adjustment - Riello RLS 70 Installation Instruction

4.16 Cams and trim potentiometers functions

Cam 1: 130°
Limits rotation towards maximum for gas.
Cam 2: 0°
Limits rotation towards minimum, air damper closed on stand by.
Cam 3: 20°
Limits gas ignition regulation.
Cam 4: 120°
Limits rotation towards maximum, high fire.
Cam 5: 30°
Regulates ignition position and low fire.
Cam 6: 110°
Regulates the valve control position high fire.
It must always be ahead of cam 5.
Cams 7 - 8:
Position jumpers
A
B

4.17 Burner starting

Turn the selection switch 11) (Fig. 3, page 8), to the OIL position.

4.17.1 Fuel oil adjustment

Perform a visual setting (without taking a smoke test), which will be
perfected after setting the gas.
Close the remote controls, with the servomotor switch in C)
(Fig. 34) in the AUTO position and the switch in (Fig. 35) in the AUT
position.
After firing, turn the switch C) (Fig. 34) to MAN position.
The servomotor should be placed at app. 30° (cam 5); if not, use
the button B) (Fig. 34) "decrease output" to stop cam 5 (low fire po-
sition). Adjust cam 5 in opening and closing, according to needs.
Use the button B) (Fig. 34) "increase output" until it stops (app.
120°, cam 4 - high fire position).
Adjust cam 4.
Attention: do not exceed 130°, this would cause mechanical prob-
lems in the variable profile cam 4) (Fig. 30, page 20).
(GAS only)
(GAS and OIL)
(GAS only)
(OIL only)
(OIL only)
(OIL only)
not used
Trim potentiometers
Slide switch
D2593
C
Fig. 34
Installation
Trim potentiometer MAX (gas only)
Limits maximum modulation.
It must be set near the stroke end (cam 1) to exploit as far as pos-
sible the variable profile cam and maximum opening of the gas but-
terfly valve.
Trim potentiometer MIN (gas only)
Limits minimum modulation.
It must be set near the stroke end (cam 2) to exploit as far as pos-
sible the variable profile cam.
Trim potentiometer POS
Limits an intermediate operating position between MAX and MIN,
supplying power to the "P" terminal in the servomotor (through an
external command). This function cuts out any external signals.
NOTE:
Using the slide switch to select MAX or MIN, the servomotor
goes into the position for the respective settings of the MAX
and MIN TRIM POTENTIOMETERS.
When the settings are complete, place the slide switch on OPE (op-
erate).
If you go below 110° (set on cam 6) the oil valve closes, therefore
set cam 6 at app. 10° before setting cam 4.

4.17.2 Gas adjustment

Turn the selector switch 11) (Fig. 3, page 8), to the gas position.
Close the operation controls, with the switch in C) (Fig. 34) in the
AUTO position.
On firing (pilot burner and main valve) turn the switch C) (Fig. 34)
to MAN and the switch in (Fig. 35) in the AUT position.
21
1 2
D791
Fig. 35
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