Danfoss FPHE 3-LE, FPHE 5-LE Data sheet
Data sheet
Oil Preheaters Types FPHE 3-LE and 5-LE
Application
Identification
FPHE-LE oil preheaters are special versions of
the standard preheaters types FPHE 3 and 5
with built-in LE valve – a hydraulically operated
diaphragm valve, which in combination with an
LE-pump significantly reduces emissions during
start and stop phases. The LE valve can also be
used as a safety shut-off valve in accordance with
DIN EN ISO 23553-1.
FPHE-LE are designed for oil burners with capacity up to 6 kg/h using standard fuel oil with
viscosity up to 10 cSt. They are available with
different heating elements and thermostats for
selection of release time and temperature.
The preheater is laser engraved with the following information (example):
FPHE 5-LE Typ e
030N5123 Code no.
230 V Voltage
30 -110 W Power consumption
130805 Date of manufacture
Features:
• Standard types of gasoil with viscosity of
max. 10 cSt. (at 20° C)
• Capacity up to 6 kg/h
• Built-in LE valve
• Max. temperature limitation
• Improved atomisation
• High average efficiency of the burner
Function
Cold start
When the boiler thermostat cuts-in, voltage is
applied to the PTC heating element and the oil in
the heat exchanger is heated until it reaches the
cut-in temperature of the preheater thermostat
(see below table). Now the burner performs a
normal starting sequence.
Warm start
If the oil temperature in the preheater is higher
than the cut-out temperature of the preheater
thermostat, the burner starts immediately.
Release times and temperatures
Thermostat 60/32 & 60/45 Thermostat 73/60
Typ e PTC
FPHE 3-LE 40 100 20 - -
50 145 27 - -
FPHE 5-LE
The figures given are measured average values on cold start and without blown air.
Note that the PTC element continues to heat during prepurge.
70 80 20 135 35
120 55 18 80 30
Release time,
seconds
Operation
If the oil temperature is low and the flow rate
is high, compared with the preheater capacity,
the preheater thermostat might cut off during
operation. To avoid this an oil burner control with
holding function must be used.
Note! The LE- valve must be replaced after 250.000
operations or 10 years (approved life expectancy).
Release temp.
in outlet, °C
Release time,
seconds
Release temp.
in outlet, °C
© Danfoss | 2021.06 AI125686475410en-010301| 1
Data sheet Oil Preheaters Types FPHE 3-LE and 5-LE
Technical Data
FPHE 3-LE FPHE 5-LE
Oil types
Nominal voltage* 230 V, 50-60 Hz
Contact load, thermostat 10 (3) A - 250 V
Max. permissible pressure 30 bar
Capacity max. 3 kg/h max. 6 kg/h
Max. ambient temperature 105°C
Storage temperature -20 to 105°C
Max. pressure drop 0.12 bar at 3 kg/h 0.20 bar at 5 kg/h
Recommended tightening torque 15 to 20 Nm
Valve opening pressure 6.5 bar 6.9 bar
Viscosity max. 10 cSt. at 20°C
* Working voltage: 100 to 265 V, 50-60 Hz
Temperature / capacity
Standard fuel gas oil and fuel gas oil
acc. to DIN 51603-6 EL A (bio content, FAME)
Power consumption / capacity
2 | AI125686475410en-010301 © Danfoss | 2021.06
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