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CIRCUIT AND TIMING DIAGRAM DMG 971
Ph
max. 10A fast
HS
6A low
5
1
2
3
4
IS
M
V1
Z
N
IRD- OR UVD CONNECTION
IRD 1020
UVD 971
BLOCK DIAGRAM DMG 971
Oscillator
µC
Watchdog
Reset
Flame
amplifier
RZ
rv2
rv1
2
6
5
7
EV
SV
8
6
A
B
7
LW
V2
SA
tw
blue
black
brown
Fault display
Information
EEPROM
system
µC
RV1
RV2
RLK
RS
rz
rs
4
3
C
9
B
HS
GW
ST
ST
RT
GW
EV
IS
RT
Z
9
C
M
V1
V2
LW
SA
tlw
tv1
tvz
tz
ts
tv2
tvz tz ts tv2
tlw
tv1
term. 8
term. 2
term. 9
Reset and
lock out
Mains
monitoring
Power
supply
monitoring
Power
supply
8
1
A
5
Mains switch
Gas proving switch
Limit thermostat
Control thermostat
External reset and lock out button
Ionisation probe
(IRD 1010, UVD 971 see separate
diagram)
Ignition
Burner motor
Solenoid valve, 1st-stage
Solenoid valve, 2nd-stage
Air proving switch
External lock out signal
max. reaction time for air proving switch
Supervised pre-purge time
Pre-ignition time
Ignition time total
Safety time
Delay 2nd-stage
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