Sime GO 18 BF G20, User, Installation And Servicing Instructions

Page: 76 / 124

76
EN
7.8 Gas valve calibration procedure
The gas valve with built-in modulator does not allow mechanical
calibration; adjustments to maximum and minimum power
must be carried out electronically.
Two calibration methods are provided:
FULL
(the display shows "
Auto
")
This is full calibration of the valve with resetting of previously
saved values. IT MUST ALWAYS BE CARRIED OUT when a
replacement is made:
– the nozzles for gas conversion
– the electronic board following a fault
– the gas valve following a fault
and is necessary so that the new components can be identified
and can communicate with those already fitted on the boiler.
PARTIAL
(the display shows "
MAnu
")
allows you to:
– check whether the valve is adjusted correctly, displaying the
pressure values at its output
– carry out any adjustment to the value, not greater than +/-
1.5
mbar
.
m
CAUTION
The adjustments described below must be carried out in
sequence ONLY by Professionally Qualified Personnel.
6
7
Fig. 65
PROCEDURE FOR FULL CALIBRATION
– set parameter tS 1.7 = 5
NOTE:
For the parameter MODIFY/DISPLAY procedure, see the
relevant section.
– connect the pressure gauge
– open one or two of the hot water cocks
Adjusting MAXIMUM
– turn dials t and D to the maximum
– press > and < at the same time (~ 5s)
The display will show the message "
Auto
" and the boiler will
come on and go up to maximum power.
OFF
RESET
Fig. 66
– the display will show the message "
P01
" (indicating that it is
possible to adjust the maximum)
– press a button ( > or < ), the display will show a number
between 0 and 150
– check that the value of the pressure at the nozzles (point 6)
matches the value in the table shown below
If not, press button > , to increase the value, or button < , to
reduce the value, until you see on the pressure gauge the
pressure value given in the table.
Once the required adjustment has been made, save it by
continually turning the dial D to the minimum value and
immediately afterwards to the maximum setpoint value.
Fig. 67