6
2 General Description
2 General Description
2.1
Air
Heater
HL
24/32
B/0
The heater basically consists of
an
electric motor (2)
serving
as
driving unit for the hot air
and
combustion
air fans, a housing accommodating
the
combustion
chamber, the glow plug and the flame detector, as well
as the heat exchanger.
At the top of the housing the glow plug and the flame
detector are installed - easily accessible for service pur-
poses. The combustion air adjusting screw can also be
accessed from above. The temperature limiter is
mounted to the heat exchanger.
The entire unit
is
enclosed by two housing halves -
split lengthwise - and two end covers ("blue" for inlet,
"red" for outlet).
1
2
3
4 5
6 7
A metering pump,
an
electronic control unit SG 1561 or
SG
1561
GT and a heater control are required
to
oper-
ate
the
heater.
The
combustion air
fan
supplies the required
air
quan-
tity - adjustable
by
means of the combustion air adjust-
ing
screw - which
is
introduced into the combustion
chamber through ports. The fuel/air "mixture" which is
formed by the fuel vaporizing at the burner matting is
ignited by the activated, pulse-controlled glow plug (ap-
plies only to electronic control unit SG
1561
GT).
The
heater unit is started up at full load. Combustion takes
place in the combustion chamber fitted inside the heat
exchanger.
The
heating air
fan
takes
in
"cold" air which then flows
around the heat exchanger where the air is heated,
and
the hot air
is
then
discharged
at
the outlet.
8
21
0
.......
0
-
0
rc
~:-::;1
-
---
c:..,'>
Ls
22
-
10
15 16
HL32 I I!:!,~
....
9 :
I~
~~-~
12
~'
15
16.1
Air Heater
HL
24
8/0
or
HL
32
8/0
1 Heating air
fan
2
Combustion
air
fan
with
motor
3 Glowplug
4
Flame
detector
5 Temperature limiter
6
Combustion
chamber
7
Heat
exchanger
8 Electronic control unit
1561
9
Switch
1 o Digital Timer
(except
for
TRS)
11
Exhaust
gas silencer
12 Heat deflector
plate
(only
for
Diesel•type
hHter)
13
Exhaust
gas outlet
14
Vaporizer (matting)•
19
~
20
19
15
Fuel
connection
16
Metering
pump
for
HL32
16.1
Metering pump
for
HL24
17
Combustion air
inlet
18
Safety switch
19
Tube
..
20
Solenoid
valve••
21
Electronic control unit
154r•
22
Electronic control unit
1561
GT
23
Pressure
equalizer
different for
Benzin
and
Diesel
types
(only for TRS)
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