TC · Edition 08.17
32
Function
3 .2 .5 Test instant for Mode 2: testing after burner run
If the jumper is set to Mode 2, the tightness test after
burner run begins as soon as the burner is switched off.
To ensure that the valves are checked for tightness once
before starting up the system, the tightness test runs
when the mains voltage (L1) is applied. If the valves are
tight, the green OK LED lights up. The OK enable signal
is not forwarded to the automatic burner control unit
until the thermostat/start-up signal
ϑ
has been applied.
The tightness test after burner run starts when the
thermostat/start-up signal
ϑ
drops. The OK enable
signal is not forwarded to the automatic burner control
unit again until the thermostat/start-up signal
ϑ
has
been re-applied.
ϑ
TEST
OK
OK
ϑ
TEST
OK
OK
L1 (+)
L1 (+)
1
5
6
7
1
5
6
7
1
2
1
2
t
p
t
t
t
p
1 2
Mode
TEST
"
: "
V1 undicht
V2 undicht
If the tightness control TC detects a leak on one of the
two valves, the red LED lights up for a fault on valve V1
1
or valve V2
2
. A fault is signalled externally
,
e.g. by switching on a buzzer or a warning light.
ϑ
TEST
OK
OK
ϑ
TEST
OK
OK
L1 (+)
L1 (+)
1
5
6
7
1
5
6
7
1
2
1
2
t
p
t
t
t
p
1 2
Mode
TEST
"
: "
V1 leaking
V2 leaking