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131L5814 Danfoss VLT HVAC Drive 18.5 kW/25HP 380-480VAC IP21
Danfoss 131L5814 VLT HVAC Drive FC 102, an 18.5 kW three-phase AC variable frequency drive designed for HVAC motor control, energy efficiency and building automation applications.
£1,833.70
Danfoss 131L5814 at a glance
The Danfoss 131L5814 is an 18.5 kW VLT HVAC Drive FC 102 for 3 × 380–480 V AC supplies, made for the fans, pumps and compressors in building services. It is a frame B1, IP21 / UL Type 1 unit, suitable for mounting in clean, dry indoor plant rooms.
This configuration has RFI class A1/B (C1) with reduced motor cable length, safe Stop, no brake chopper, a graphical LCP 102 control panel, and a PROFIBUS DP MCA 101 fieldbus card. The full type code is decoded alongside the FAQs.
Sizing and installation
- Enclosure: IP21 / UL Type 1 — suitable for mounting in clean, dry indoor plant rooms.
- EMC: RFI class A1/B (C1) is met only with a reduced screened motor cable length. Check the maximum length for this frame in the Danfoss FC 102 Design Guide (Technical Documents tab); for longer runs, ask us about an H2 (A2/C3) variant.
FC 102 features for HVAC
- Built-in RS-485 protocols: Danfoss FC, Modbus RTU, BACnet MS/TP, Metasys N2 and FLN Apogee — connects to most building management systems without an option card.
- Fire Mode keeps the drive running during an emergency, for example to keep smoke-extract fans turning.
- Automatic Energy Optimisation (AEO) cuts motor losses at part load — Danfoss quotes a further 5–15% saving.
- Pump and fan functions: sleep mode, dry-pump, end-of-curve and broken-belt detection, plus a built-in cascade controller for pump sets.
- Built-in DC coils limit mains harmonics (EN 61000-3-12).
- Smart Logic Controller for simple sequencing without a PLC.
Where the energy saving comes from
Centrifugal fans and pumps follow the affinity laws: absorbed power falls with the cube of speed. Running at 80% speed needs roughly half the power of full speed (0.8³ ≈ 0.51, before motor and drive losses) — which is why speed control pays back faster on fans and pumps than almost any other load.
Other sizes and enclosures
Same 18.5 kW rating, other enclosures
This driveIP21Danfoss 131L5814IP21 / UL Type 1
EnclosureIP20Danfoss 131Z8148IP20 / chassisView drive →
EnclosureIP55Danfoss 131L5921IP55 / UL Type 12View drive →
EnclosureIP66Danfoss 131B9318IP66 / UL Type 4XView drive →
Typical applications
✓ Supply and extract fans in air-handling units
✓ Chilled- and hot-water circulation pumps
✓ Cooling towers and condenser fans
✓ Booster sets and multi-pump stations
✓ Ventilation and smoke-extract systems
Technical Specifications
Tick the specs you need, then view products that match.
| Power | 18.5 kW | |
|---|---|---|
| Current | 34 A | |
| Voltage | 480 V | |
| Phase | Three Phase | |
| IP Rating | IP21 | |
| EMC Filter | Commercial | |
| Series | VLT HVAC Drive FC 102 | |
| Part number | 131L5814 | |
| Model code | FC-102P18KT4E21H3TGXXXXSXXXXA0BXCXXXXDX | |
| Product type | AC variable frequency drive | |
| Rated output power | 18.5 kW | |
| Horsepower rating | 25 HP | |
| Rated current | 34 A | |
| Input voltage | 380–480 V AC | |
| Input phases | Three-phase | |
| Protection rating | IP21 / Type 1 | |
| RFI filter | Class A1/B (C1) | |
| Safety function | Safe Stop | |
| Control panel | Graphical local control panel | |
| A option | PROFIBUS DP MCA 101 | |
| B option | No B option | |
| PCB coating | Not coated PCB | |
| Mains option | No mains option | |
| Adaptation | Standard cable entries | |
| Frame size | B1 | |
| Net weight | approx. 21.44 kg | |
| Gross weight | approx. 25.06 kg | |
| EAN | 5702427766587 |
Frequently asked questions
What is the maximum motor cable length with this RFI filter?
The 131L5814 has the H3 filter: RFI class A1/B (C1) with a reduced motor cable length. The exact limit for this frame is in the Danfoss VLT HVAC Drive FC 102 Design Guide (see Technical Documents). If your screened cable run is longer, contact us and we will suggest an alternative.
Which communication protocols does it support?
This unit is fitted with a PROFIBUS DP MCA 101 card, in addition to the built-in RS-485 protocols: Danfoss FC, Modbus RTU, BACnet MS/TP, Metasys N2 and FLN Apogee.
Can this drive be wall mounted without a panel?
Yes. The IP21 / UL Type 1 enclosure is designed for direct mounting.
Type code decoded
FC-102P18KT4E21H3TGXXXXSXXXXA0BXCXXXXDX
G fitted / defines this unit X not fitted / standard
| Product series Position 1–6 | VLT HVAC Drive FC 102 | FC-102 |
|---|---|---|
| Power size Position 7–10 | 18.5 kW | P18K |
| Mains voltage Position 11–12 | 3 × 380–480 V AC | T4 |
| Enclosure Position 13–15 | IP21 / UL Type 1 | E21 |
| RFI filter Position 16–17 | RFI class A1/B (C1) with reduced motor cable length | H3 |
| Brake / Safe Stop Position 18 | Safe Stop, no brake chopper | T |
| Local control panel Position 19 | Graphical LCP 102 | G |
| PCB coating Position 20 | Standard (uncoated) PCBs | X |
| Mains option Position 21 | No mains option | X |
| Adaptation A Position 22 | Standard cable entries | X |
| Adaptation B Position 23 | Standard | X |
| Software release Position 24–27 | Latest standard release | SXXX |
| Software language Position 28 | Standard language package | X |
| A option (fieldbus) Position 29–30 | PROFIBUS DP MCA 101 | A0 |
| B option (I/O) Position 31–32 | No B option | BX |
| C0 option Position 33–34 | No C0 option | CX |
| C1 option Position 35 | No C1 option | X |
| C option software Position 36–37 | None | XX |
| D option Position 38–39 | No D option | DX |
