Riello RS 250/M MZ Instructions Pour L'installation, L'utilisation Et L'entretien page 41

Signal
No blink The burner does not start
The burner continues to
repeat the start-up cycle,
without lockout
Ignition with pulsations
Burner does not reach maxi-
mum output
Burner stops with air damper
open
Problem
38 - No electrical power supply . . . . . . . . . . . . . . . . . . . . . . .
39 - A limiter or safety control device is open . . . . . . . . . . . .
40 - Line fuse blocked . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
41 - Defective control box . . . . . . . . . . . . . . . . . . . . . . . . . . .
42 - No gas supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
43 - Mains gas pressure insufficient . . . . . . . . . . . . . . . . . . .
44 - Minimum gas pressure switch fails to close. . . . . . . . . .
45 - Servomotor fails to move to min. ignition position . . . . .
46 - The gas pressure in the gas mains lies very close to the
value to which the minimum gas pressure switch has
been set. The sudden drop in pressure after valve open-
ing causes temporary opening of the pressure switch
itself, the valve immediately closes and the burner
comes to a halt. Pressure increases again, the pressure
switch closes again and the ignition cycle is repeated.
And so on
47 - Poorly adjusted head . . . . . . . . . . . . . . . . . . . . . . . . . . .
48 - Ignition electrode incorrectly adjusted . . . . . . . . . . . . . .
49 - Incorrectly adjusted fan air damper: too much air . . . . .
50 - Output during ignition phase is too high. . . . . . . . . . . . .
51 - Remote control device TR fails to close. . . . . . . . . . . . .
52 - Defective control box . . . . . . . . . . . . . . . . . . . . . . . . . . .
53 - Defective servomotor . . . . . . . . . . . . . . . . . . . . . . . . . . .
54 - Defective servomotor . . . . . . . . . . . . . . . . . . . . . . . . . . .
Possible cause
37
Recommended remedy
Close all switches - Check connections
Adjust or replace
Replace
Replace
Open the manual valves between contactor
and train
Contact your GAS COMPANY
Adjust or replace
Replace
Reduce the minimum gas pressure switch
intervention pressure. Replace the gas filter
cartridge.
Adjust. See page 17
Adjust, see fig. (C) page 14
Adjust
Reduce
Adjust or replace
Replace
Replace
Replace