Danfoss FPHE 3, FPHE 5, FPHE 10 Data sheet

Data sheet

Oil Preheaters Types FPHE 3, 5 and 10

Application

Identification

Function

FPHE oil preheaters are designed for oil burners with
capacity up to 12 kg/h using standard fuel oil with
viscosity up to 10 cSt.
The preheaters 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 Typ e

030N5004 Code no.

230 V Voltage

30-110 W Power consumption

130805 Date of manufacture

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.

Features:

• Standard types of gasoil with viscosity of max.
10 cSt. (at 20°C)

• Capacity up to 12 kg/h

• Max. temperature limitation

• Improved atomisation

• High average efficiency of the burner

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.

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 40 80 22 - -

50 130 36 - -

FPHE 5

FPHE 10

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 75 26 130 43

120 50 22 80 32

2 x 50 120 44 - -

2 x 70 110 41 150 60

2 x 120 65 39 85 49

Release time,

seconds

Release temp.

in outlet, °C

Release time,

seconds

Release temp.

in outlet, °C

© Danfoss | 2019.07 VD.FB.C3.02| 1

Data sheet Oil Preheaters Types FPHE 3, 5 and 10

Technical Data

FPHE 3 FPHE 5 FPHE 10

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. 12 kg/h

Max. ambient temperature 105°C

Storage temperature -20 to 105°C

Max. pressure drop 0.03 bar at 3 kg/h 0.05 bar at 5 kg/h 0.25 bar at 10 kg/h

Recommended tightening torque 15 to 20 Nm

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 | VD.FB.C3.02 © Danfoss | 2019.07