Advertisement
CIRCUIT AND TIMING DIAGRAM DMG 973
WITH AIR DAMPER MOTOR
Ph
max. 10A fast
HS
6A low
1
3
4
2
IS
M
Z
N
WITHOUT AIR DAMPER MOTOR
Ph
HS
max. 10A fast
6A low
4
1
2
3
IS
M
Z
N
IRD- OR UVD CONNECTION
IRD 1020.1
UVD 971
BLOCK DIAGRAM DMG 973
Oscillator
µC
Watchdog
Reset
Flame
amplifier
RZ
rlk
rv2
2
C
6
5
ST
GW
RT
5
6
B
C
7
LW
V1
L
SA
ST
GW
RT
5
6
C
B
7
LW
V1
V2
SA
blue
black
brown
Fault display
Information
EEPROM
system
µC
RV1
RV2
RLK
RS
rv1
rs
rz
7
4
3
B
EV
A
9
8
EV
9
A
8
tlw
tv1 tlk tr tf
tvz tn ts tv2
term. 8
term. 2
term. 9
Reset and
lock out
Mains
monitoring
Power
supply
monitoring
Power
supply
8
9
A
5
HS
Mains switch
GW
Gas proving switch
ST
Limit thermostat
RT
Control thermostat
EV
External reset and lock out button
IS
Ionisation probe
(IRD 1020.1, UVD 970 see separate
diagram)
Z
Ignition
M
Burner motor
V1
Solenoid valve, 1st-stage
V2
Solenoid valve, 2nd-stage
LW
Air proving switch
SA
External lock out signal
L
Air damper motor
tlw
max. reaction time for air proving
switch
tv1
Supervised pre-purge time
tlk
LK-open command during
pre-purge
tr
LK-close movement
tf
Stray light monitoring
tvz
Pre-ignition time
tn
Post-ignition time
ts
Safety time
tv2
Delay terminal 6/C
Advertisement
