22
6 Components
6.2 Fuel System .
6.2.1
Metering Pump
Description:
The metering pump is designed to deliver
and meter
the
fuel tor the heater and serves as shut-off
device at
the
same time.
It
operates
on
the principle of
an electromagnetic reciprocating pump.
Cycling frequency within
the
operating voltage range:
! HL24B
I HL24 D
; Air Top 24
BI
Air Top 24 D
• i
FL
1.39
Hz
; 1.22
Hz
•
1.39Hz
; 1.22
Hz
PL
0.69
Hz
1
0.61
Hz
• 0.69 Hz
:
0.61
Hz
i
; HL32 B ! HL32 D ! Air Top 32 B i Air Top 32 D
i I
FL
1
.85
Hz
1 1.63
Hz
: 1.85 Hz 1.63
Hz
PL
: 0.925
Hz
I 0.815
Hz
I 0.925 Hz j 0.815
Hz
I i i
Check: Internal resistance
'I
HL24
BID
Air
Top
24
8/D
12V
J 1oohms
24
V
40ohms
I
i HL32 BID
I Air Top 32 B/D
I
(
10ohms
i 40 ohms
I
NOTE:
Delivery
rate
V (ml)
of
metering pump after 180
sec.
pumping time as a function
of
the input voltage
UE(V)
of the control unit..
Tu=
+ 20 ± 2("C)
V
ml
HL24B
Air
Top
24 B
30-+--+----+--+---+---t--+-
2s---------------
20----------
1s----
10-------------
5
+---+--1--+---+--I---+
0-t---,--i--~-t--""'1---t--.UE
12V:
9 10
11
12 13 14
24V:
18 20 22
24
26 28
V
V
V
ml
HL24D
Air
Top
24
D
30------+--+----+-
25------+------
20---+--f---+--+-----+-
15
--------
10-+--+-~---+--+--+--1-
5
-+---+--1---+--+--+---+-
0
+--+--+--+--+-~~-+-l
►
U E
12V:
9
24V:
18
ml
10
11
12
13 14
20 22
24 26
28
HL32
B
AirTop32
B
30-------------
.....
25-+--+--+--+--
20--+--
15--------+------
10----+--f----+--+-----+-
5
-+--+--l---+--+--+---+-
Q
1---1--+---+--+--+--+
...
uE
12V:
9 10
11
12 13 14
24V:
18 20 22
24
26
28
ml
HL32D
Air Top
32
D
30--------------
25--------+-------
20-+---+---+-
1s----
10-+--~-+--+---+--+-----1-
5
-+--+--+--+-~-+------l-
01---1--+--+-+--+---+~
u E
12V:
9 10
11
12 13 14
24V:
18 20 22 24 26 28
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