Savio 20/1 MFS User Manual page 51

Fault finding
ref. 31 Check the gas pressure at the test point for measuring
outlet pressure at the gas valve and compare with the
value on sect. 1.2.
ref. 32 Check the gas pressure at the test point for measuring
inlet pressure at the gas valve and compare with the
value on sect. 1.2.
ref. 33 e.g. leave the smallest radiator open and close the
others.
ohm
12500
11500
10500
9500
8500
7500
6500
5500
4500
3500
2500
1500
500
20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105110
ref. 34 The resistance of the temperature probe depends on
its temperature (18 000 ohm at 10 ° C).
See the diagram for proper electric resistance at other
temperatures. Set the tester to ohm.
ref. 35 To check the continuity of a cable, disconnect the cable
from its circuit and measure the resistance when the
two ends of the cable are connected. The resistance
should be zero ohms with the tester set to the ohms
function. Set the tester to ohm.
ref. 36 To check the coil of the gas modulator disconnect the
winding from its circuit and measure the resistance in
the winding (set the tester to ohm):
Gas modulator coil
° C
ref. 37 To check the current flowing through the gas modu-
lator coil disconnect one of the connectors and insert
the ammeter (200 mA= full---scale minimum) between
the connector and the terminal of the coil.
To obtain the maximum gas pressure to the burner the
current must be at least 150 mA=.
Set the tester to ADC.
rev. 17.09.93
125 ohm
49