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CIRCUIT AND TIMING DIAGRAM DMG 970
Ph
max. 10A fast
HS
6A low
1
2
3
4
5
IS
M
Z
N
IRD- OR UVD CONNECTION
IRD 1020
UVD 971
BLOCK DIAGRAM DMG 970
Oscillator
µC
Watchdog
Reset
Flame
amplifier
RZ
rv1
rv2
2
6
5
ST
GW
RT
B
7
8
6
LW
V1
V2
SA
tlw tv1 tf
blue
black
brown
Fault display
Information
EEPROM
system
µC
RV1
RV2
RS
rs
rz
7
4
3
B
HS
GW
ST
EV
RT
EV
IS
9
A
Z
M
V1
V2
LW
SA
tlw
tv1
tf
tvz
tn
ts
tv2
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
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
Stray light monitoring
Pre-ignition time
Post-ignition time
Safety time
Delay 2nd-stage
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