Pfannenberg FLH-T 600 Fan Heater with Integrated Thermostat

Fan heater with its own thermostat for demanding cabinets

The Pfannenberg FLH-T 600 is a fan heater with an integrated thermostat from the FLH-T line, which the manufacturer describes as developed for demanding environments such as wind turbines and telecommunications cabinets. A ball-bearing fan distributes the heat quickly and evenly, and the built-in thermostat regulates the heater automatically, so no external controller is needed for basic operation.

The line is sized for larger control cabinets, where the high air volume of the fan removes cold spots and speeds up the warm-up of the enclosure, protecting equipment from both low temperature and condensation.

Technical specifications

Common data: rated voltage 230 V AC 50/60 Hz, functional range 104-127 V or 207-258 V; thermostat temperature setting range -20 to +40 °C with switching difference below 7 K and tolerance +/-4 K; operating and storage temperature -40 to +70 °C; ball-bearing fan with L10 service life of 52,500 h at +25 °C; volumetric air flow 160 m³/h at 50 Hz and 180 m³/h at 60 Hz; protection IP 20, class II (double insulation); plastic housing UL 94 V-0, black; four M5 screws for mounting (not included); 2-pole terminal strip; outline 150 x 100 x 164 mm.

Vibration tests and applications

The data sheet states that the range was tested to EN 60068-2-6, EN 60068-2-27 and EN 60068-2-29, the standards for vibration and shock tests of railway rolling-stock equipment. That evidence is useful for cabinets on vibrating structures, such as nacelle or machine-mounted enclosures, and on vehicles; it does not change the IP 20 rating, so the heater belongs inside the enclosure.

The product page also lists UL 499 and UL 508 certificates for the FLH-T and the declaration of conformity; check them against the article number if the specification demands listed parts.

Selection and what to confirm before ordering

Choose the heater power from the enclosure volume, the minimum ambient temperature and the dissipated heat, then confirm the supply voltage. Because the thermostat is built in and has a fixed range of -20 to +40 °C, check that the range suits the set point you want; where a separate thermostat or a twin thermostat with a hygrostat is preferred, the FLH or PFH ranges without built-in thermostat can be used instead.

The L10 life of 52,500 h at +25 °C corresponds to about six years of continuous operation, although the heater only runs when the thermostat calls for heat, so the practical life is usually longer. Mount the heater at the bottom of the enclosure on four M5 screws with clearance at the air inlet and outlet. The sheet lists a hygrostat, 17207000000, and an internal enclosure fan, 18110000000, as accessories.

How the Pfannenberg FLH-T 600 works

A heating element warms the air, and a fan with ball bearings blows it through the cabinet. The built-in thermostat switches the heater on when the air gets cold and off when it is warm enough. The moving air removes cold spots and warms the cabinet faster than a heater without a fan.

Where the FLH-T 600 is used

• Larger control cabinets
• Wind turbine enclosures
• Telecommunications cabinets
• Cabinets on vibrating structures
• Cabinets that need to avoid condensation

Selection checklist for the FLH-T 600

• Heating power of 600 W
• Supply voltage, 230 V or 115 V
• Starting current of 3.4 A
• Thermostat range
• Air flow
• Cabinet volume
• Mounting space of 150 by 100 by 164 mm
• Terminal connection

Installation, commissioning and maintenance notes for the FLH-T 600

Fix the heater inside the enclosure with four M5 screws, which are not supplied. Leave room round the fan intake and outlet. Connect the supply to the 2-pole terminal strip. Set the thermostat. Watch the cabinet temperature during the first cold spell and keep the fan free of dust.

Requesting a quotation for the Pfannenberg FLH-T 600

Please send the supply voltage, the cabinet size and the quantity. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

FLH-T 600 heating power

The heating power at 20 degrees C is 600 W.

FLH-T 600 starting current

The maximum starting current is 3.4 A.

FLH-T 600 thermostat

The setting range is minus 20 to plus 40 degrees C, with a switching difference below 7 K.

FLH-T 600 fan

The ball-bearing fan has a service life of 52,500 hours at 25 degrees C.

FLH-T 600 air flow

The air flow is 160 cubic metres per hour at 50 Hz and 180 at 60 Hz.

FLH-T 600 temperature range

The operating and storage range is minus 40 to plus 70 degrees C.

FLH-T 600 protection

The protection is IP 20, in class II with double insulation.

FLH-T 600 housing

The black plastic housing is rated UL 94 V-0.

Heater records for the FLH-T 600

Record the cabinet number, the thermostat setting and the date of fitting.

Choosing the right FLH-T 600 power

Choose the power by the cabinet volume and the coldest temperature expected on site.

FLH-T 600 supply range

The rated voltage is 230 V AC at 50 or 60 Hz, with functional ranges of 104 to 127 V or 207 to 258 V.

FLH-T 600 thermostat tolerance

The thermostat tolerance is plus or minus 4 K.

FLH-T 600 vibration tests

The data sheet states tests to EN 60068-2-6, EN 60068-2-27 and EN 60068-2-29.

FLH-T 600 mounting

Four M5 screws hold the heater, and a 2-pole terminal strip takes the supply.

Documents and quotation

The Pfannenberg FLH-T product sheet is attached to this page and is the manufacturer’s own document, not a Seven Star summary. It also carries the outline drawing for the housing and fixing feet. Related enclosure climate products are in HVAC & Combustion.

State the model and the supply voltage. Seven Star LLC, an independent supplier in Muscat, quotes the FLH-T 250 to FLH-T 1000 against your application data; send the enclosure size, ambient temperature, supply voltage and quantity so the correct variant and article number can be confirmed before an offer is issued.