Riello RX 120 S/PV Manuel D'entretien page 57

3.6 COMBUSTION MAMAGER CM222
The Combustion Manager CM222 is a microprocessor-controlled gas burner safety control system designed for use with forced draught modulating
gas burners.
OPERATION
The range-limits of the potentiometer are expert parameters. Adjustments of the potentiometers are immediately active in all program steps.
To deactivate the potentiometers set the minimum limit and the maximum limit of each potentiometer equal.
Then these equal values are the active setpoints.
The values of the min. capacity potentiometer and the max. capacity potentiometer are the limits for the modulation of the burner capacity. These
limits are used during program step 'Burner operation'.
The value of the max. capacity potentiometer is also the setpoint for the prepurge speed.
The value of the start capacity potentiometer is the setpoint for the burner capacity during program step 'Ignition' and 'Flame stabilization'.
ERROR CODE
If the burner control is in lockout the error code is shown in the display as a blinking number. The following error codes will be displayed as a blinking
number:
No. Error code
1 Failure fan
2 Failure gas pressure
3 Failure flame
4 Failure BCC
5 Failure Remote Reset
6 Failure gas valve circuit
7 Failure air pressure
8 Failure CRC
9 Failure power supply
E Safety shut down
PROGRAM STEPS
No. Program step
Standby
0
Standstill check
1
Prepurge check
2
Prepurge
3
Waiting for ignition speed
4
Safety time
5
Flame stabilization time
6
Burner operation
7
Gas valve circuit V1/V2 check
8
Postpurge
9
POTENZIOMETER MAX
POTENZIOMETER START
DISPLAY AND RESET BUTTON
POTENZIOMETER DI MINIMUM
Explanation
Fan speed check. Deviation too high
No signal from the gas pressure switch
No flame signal after burner start-up /
Flame loss during burner operation /
Flame signal without burner operation
Wrong BCC connected / BCC lost /
BCC parameter block is not valid
More than 5 remote resets in 15 minutes /
Permanent remote reset (> 10 sec)
Gas valve V1/V2 leak
No signal from the air pressure switch
The parameter block is not valid
The power supply is not sufficient (lower than
185VAC or higher than 270VAC).
The safety operating system has done a safety
shut down.
Explanation
Waiting for heat demand; All actors off
Fan standstill check; APS-Off-Check
Fan speed check; APS-On-Check
Fan: prepurge speed; Time is parameter
Waiting until fan reached ignition speed
Ignition and gas valves on; Fan: ignition speed; Time is parameter
Fan: ignition speed for flame stabilization; Time is parameter
Fan: Modulation speed
Checking gas valves tightness with flame signal
Fan: postpurge speed; Time is parameter
7 GB
Buner off Lockout
x x
x -
x x
x x
x / - x / -
x x
x x
x x
x -
x x
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