19
DOMITOP HF 24 - 30 E
FERELLA GOLD HF 24 - 30 MEL
Version - 09.2002
Adjusting burner pressure
Since this unit has flame modulation, there are two fixed pressure settings: the minimum and maximum,
which must be as stated in the technical data chart according to the type of gas.
Connect a suitable pressure gauge to pressure point
B
downstream from the gas valve.
Disconnect the pressure compensation tube
F
.
Take off the protective cap
C
.
Set the potentiometer
P3
(on the control card) to minimum
(clockwise).
Run the boiler in heating mode.
Adjust the minimum pressure with the screw
D
, clockwise
to decrease it and anticlockwise to increase it.
Set the potentiometer
P3
to maximum (anticlockwise).
Turn on the
TEST
function by temporarily bridging X5.
Adjust the maximum pressure with the screw
E
, clockwise
to increase it and anticlockwise to decrease it.
Reconnect the pressure compensation tube
F
.
Put the protection screw
C
back in.
Disconnect the test jumper.
N.B.
The test lasts 5 minutes
C
F
E
B
A
D
25+/-50V DC
COMMON
80+/-110V DC
K e y
A
Pressure point upstream
B
Pressure point downstream
C
Protection screw
D
Minimum pressure
adjustment screw
E
Maximum pressure
adjustment screw
F
Pressure compensation
tube
After checking or
adjusting the
pressure, it is mandatory to
seal the adjustment screw
with paint or a specific seal.
24 kW version
30 kW version
kW
mbar
18
19
20
21
22
23
5
10
15
20
25
30
35
9
10
11
12
13
14
15
16
17
8
24
25
26
27
28
29
30
31
32
33
34
G31
LPG
G20
Nat. gas
Supplied by HeatingSpares247.com
