User manual P 40 - P 120
Issue: 10.10
10 Fitting Instructions
Page 23
Oil atomising nozzle
The oil atomising nozzle and the pump pressure together determine the output of the heater. After a few
years, a worn nozzle may deliver too much or too little oil. This in turn could lead to combustion
problems described under "Pump pressure".
If too little fuel is being delivered, and the pump pressure is correct, check to see whether there are any
blockages in the fuel system, dirt in the oil filter or in the nozzle filter. If no blockages are found, the
nozzle should be replaced.
If too much fuel is being delivered, and the pump pressure is correct, check to see whether there are
any leaks in the heater. If no leaks are found, replace the nozzle.
• Replace the oil atomising nozzle with a genuine nozzle of the same make and type. The heater is
designed and adjusted to suit that particular make and model of nozzle.
• After a new nozzle has been fitted, check the adjustment of the ignition electrodes and the orifice
(see diagram under “Ignition System”).
The correct nozzles for the various models of heater shown in the table below.
Heater
model
Make of
nozzle
Discharge (US-gal/h)
Flow
ltr/h
Nozzle
model
Code no.
DANFOSS
Kerosene
Diesel
P 40
1,10
1,10
4
60
°
S
N52800079
P 60
1,35
1,35
6
60
°
S
N51100001
P 80
2,00
2,00
8
60
°
S
N51300001
2,50
-
10
60
°
S
N51400002
P 100
-
2,25
10
60
°
S
N51800001
P 120
2,75
2,75
12
60
°
S
N51500001
Photocell
The photocell is mounted in a holder attached to the back of the combustion chamber. The photocell's
function is to check whether there is a flame in the combustion chamber when the heater is activated
and while it is in operation. If no flame is detected during activation or when the heater is in operation,
the heater will lock out. However, if the photocell is dirty or faulty, it may not detect a flame even when
there is one, causing the heater to lock out.
The amount of burning LED’s changes per appliance, pump pressure and environment (dust/oxygen),
but at least 4 LED’s should burn stable.
There are 11 steps:
The current should be max. 19
µ
A when the heater is activated and min. 25
µ
A. during normal operation.
If the current is more than 19
µ
A when the heater is activated, the photocell is probably being "confused"
by light from an external source. If during normal operation the current is less than 25
µ
A, the photocell
is probably weak or dirty, the flame is irregular because the combustion head is dirty or the nozzle is
blocked.
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Flashing
●
Burning
○
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0
4
8 12 16 20 24 28 32 36 40 [µA]
