Combustion Manager Cm222 - Riello RX 70 S/PV K Installation, Use And Maintenance Instructions

4.7

Combustion Manager CM222

The Combustion Manager used, is CM222 produced by Krom-
schroeder.
is a microprocessor-controlled gas burner safety control system
designed for use with forced draught modulating gas burners.
4.7.1 Operation
The three potentiometers (Fig. 3) allow to adjust the speed value
inside the range set in the internal CM222 parameters.
The maximum potentiometer allows to set the maximum speed
and therefore the maximum burnt output, the minimum potenti-
ometer allows to set the minimum speed and the start potentiom-
eter allows to adjust the ignition output.
The display has different functions: it verifies the fan operation,
the failure type and also the function of burner reset button.
4.7.2 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
3 Failure flame
4 Failure BCC
5 Failure Remote Reset
8 Failure CRC
9 Failure power supply
E Safety shut down
4.7.3 Program steps
No. Program step
0 Standby
1 Standstill check
2 Prepurge
3 Prepurge
4 Waiting for ignition speed
5.0 Safety time
6 Flame stabilization time
7 Burner operation
8 Gas valve circuit V1/V2 check
9 Postpurge
20029918
Technical description of the burner
:
Explanation
Fan speed check. Deviation too high
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 / Perma-
nent remote reset (> 10 sec)
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
8
GB
D9716
Potenziometer max
Potenziometer start
Display and reset button
Potenziometer di minimum
Buner off Lockout
x x
x x
x x
x / - x / -
x x
x -
x x
Fig. 3