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CIRCUIT AND TIMING DIAGRAM DKG 972
Ph
max. 10 A fast
HS
6 A slow
1
2
3
4
5
V1
M
IS
Z
N
IRD- OR UVD CONNECTION
IRD 1020.1
UVD 971
BLOCK DIAGRAM DKG 972
Oscillator
µC
Watchdog
Reset
Flame
amplifier
RZ
rz
1
3
4
ST
GW
RT
EV
6
7
8
9
A
V2
SA
tw tf tvz tn ts tv2
term. 8
blue
term. 1
black
term. 9
brown
Fault display
Information
EEPROM
system
µC
RV1
RV2
RS
rs
rv1
rv2
5
6
7
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 971see separate diagram)
Z
Ignition
V1
Solenoid valve, 1st-stage
V2
Solenoid valve, 2nd-stage
SA
External lock out signal
M
Auxiliary blower
tw
Waiting time
tf
Stray light monitoring
tvz
Pre-ignition time
tn
Post-ignition
ts
Safety time
tv2
2nd-stage delay
Reset and
lock out
Mains
monitoring
Power
supply
monitoring
Power
supply
8
9
A
5
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