20029918
8
GB
Technical description of the burner
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
:
4.7.3
Program steps
Fig. 3
D9716
Potenziometer max
Potenziometer start
Display and reset button
Potenziometer di minimum
No.
Error code
Explanation
Buner off
Lockout
1
Failure fan
Fan speed check. Deviation too high
x
x
3
Failure flame
No flame signal after burner start-up /Flame loss
during burner operation /Flame signal without
burner operation
x
x
4
Failure BCC
Wrong BCC connected /
BCC lost /
BCC parameter block is not valid
x
x
5
Failure Remote Reset
More than 5 remote resets in 15 minutes / Perma-
nent remote reset (> 10 sec)
x / -
x / -
8
Failure CRC
The parameter block is not valid
x
x
9
Failure power supply
The power supply is not sufficient (lower than
185VAC or higher than 270VAC).
x
-
E
Safety shut down
The safety operating system has done a safety
shut down.
x
x
No.
Program step
Explanation
0
Standby
Waiting for heat demand;
All actors off
1
Standstill check
Fan standstill check; APS-Off-Check
2
Prepurge
Fan speed check; APS-On-Check
3
Prepurge
Fan: prepurge speed; Time is parameter
4
Waiting for ignition speed
Waiting until fan reached ignition speed
5.0
Safety time
Ignition and gas valves on; Fan: ignition speed; Time is parameter
6
Flame stabilization time
Fan: ignition speed for flame stabilization; Time is parameter
7
Burner operation
Fan: Modulation speed
8
Gas valve circuit V1/V2 check
Checking gas valves tightness with flame signal
9
Postpurge
Fan: postpurge speed; Time is parameter
