12
420010250900
BLU 500.1 ÷ 1200.1 PR SW
EN
2
SELECTOR
0
AUTO
0 = operating elements locked
in an intermediate position
=
operation on maximum capacity
=
operation on minimum capacity
AUTO = automatic operation
ADJUSTING THE MAXIMUM CAPACITY OF THE BURNER
Position the selector, situated on the control panel, on position maximum power and proceed as follows:
Adjusting the maximum gas flow rate:
- proceed as stated in the regulating the solenoid valves until you achie-
ve the correct gas flow, as established by analyzing the combustion process. Eventually adjust the gas flow rate
using a suitable allen wrench, alter the position of the cam(3) guide blade; if you screw it down, the flow rate is
reduced; if you unscrew it, the flow rate increases.
Adjusting the maximum air flow rate:
Eventually adjust this position acting on the screw “1 “, after loosening nut
“ 2 “. Tighten the nut “2” in place once again.
ADJUSTING THE MINIMUM CAPACITY OF THE BURNER
Position the selector, situated on the control panel, on position minimum power and proceed as follows:
Adjusting the minimum gas flow rate:
using a suitable Allen wrench, alter the position of the cam(3) guide
blade; if you screw it down, the flow rate is reduced; if you unscrew it, the flow rate increases.
Adjusting the minimum air flow rate:
adjust on limit switch for air damper “Low Flame” position adjustment.
1
3
AIR ADJUSTMENT
To calculate the burner’s working output, in kW, proceed as follows:
- Check at the meter the quantity of supplied litres and the duration,
in seconds, of the reading, then calculate the burner’s output through
the following formula:
CALCULATION OF WORKING OUTPUT OF THE BURNER
e x f = kW
s
e
= Litres of gas
s
= Time in seconds
G20 = 34,02
G25 = 29,25
G30 = 116
G31 = 88
f
Remove cover to gain access to the adjusting cams.The cams are to be
adjusted through the suitable key provided for. Description:
I
-
Limit switch for air damper “High Flame” position adjustment
(Max. power)
II
-
Limit switch for the air damper position at burner’s shut down
III -
Limit switch for air damper “Low Flame” position adjustment
(Min. power)
V
- Limit switch "NOT USED".
LANDIS & STAEFA SQN 31 251A2700 AIR DAMPER MOTOR
MANUAL RELEA-
SE SWITCH
