A
B
C
D
E
F
Operation indicator
Part load switch or
room
thermostat A
(lull load/part load) B
Flame detector
Glow plug
C
Metering
pump,
full
load/part load
Combustion air
fan.
full
load/part load D
E
F
Functional
Description
5
---·
·-----
-----
·---
---■
----••r-
Functional Diagram
of
Pos.
A2,
Regular Sequence
of
Functions (Control Units
1561
and 1561 GT)
1 Switching on
2 Preheating
30
sec.
3 Fuel inlet flow 5
sec.
4 Safety time
max.
90
sec.
6 Combustion mode - lull
load
7 Room temperature (setpoint
value
reached)
8 Change-over
from
lull
load
to
part load 20
sec.
9 Combustion
mode
-
part
load
A
B
C
D
E
F
Operation Indicator
Part
load
switch or
room
thermostat
(full
load/part load)
Flame detector
Pencil-type glow
plug
(current of Air
Top
pencil-type glow
plug is of the pulsed type)
Metering
pump,
full
load/part load
Combustion
air
Ian,
full
load/part load
A
B
C
D
E
F
i,-
10
Room
temperature (setpoint value not reached)
11
Change-over from part
load
to
full load (10 sec.)
12
Switching off
13
Optical after-run
max.
80
sec.
14
Eledronic after-run (Hl24 = 150 sec./HL32 = 180 sec.)
15
Off
---
If no combustion is established. start-up
is
repeated automatically
(30
sec.
preheating.
90
sec.
safety time)
~
I
I
I
I
I
I
I
I
•
~
-
11--1
-·
----
-·
----
----
·-
Functional Diagram
of
Po~.
A2,
Regular Sequence
of
Functions,
Control
Unit
1561
GS
(order
no.
241
89A)
1 Switching on
2
Preheating 25
sec.,
pulse-controlled
3 Fuel inlet flow 5
sec.
4 Full load start-up
for
motor
to
break away
5 Part load start-up 20
sec.
6 Full load start-up
7
Safety
time
max.
90
sec.
8 Min. full load
period
60 s
9 Combustion
mode
• lull
load
10
Room temperature (setpoint
value
reached)
11
Change-over
from
lull
load
to
part load 8
sec.
5.1.4
Switching
the
Heater
Off
When the heater is switched off manually
or
when the
preset operating time has elapsed, the operation indica-
tor extinguishes.
Metering pump Y
is
switched off, fuel supply is inter-
rupted.
- The after-run period starts immediately.
12
Combustion mode - part load
13
Room
temperature (setpoint value not reached)
14
Change-over from part load
to
full load (10 sec.)
15
Switching off
16
Optical after-run max.
80
sec.
17
Electronic after-run (Air Top 24 = 150 sac.I Air Top 32 =
180
sec.)
18
Off
• If no combustion is established, start-up
is
repeated
automatically (25
sec.
preheating, 90 sec. safety time)
TRS: A short after-run period is initiated automatically
- if the heater is switched
off (normally),
if the vehicle's engine is switched off,
if any fuel pumping device
is
put into operation.
13
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