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134L9594 Danfoss VLT HVAC Drive 15 kW/20HP 525-690VAC IP21
Danfoss 134L9594 VLT HVAC Drive FC 102 variable frequency drive featuring 15 kW output power, three-phase 525–690 V AC supply, IP21 / Type 1 enclosure, RFI Class A1 / C2 filtering, brake chopper, Safe Stop and graphical local control panel for HVAC motor control applications.
£1,916.75
Danfoss 134L9594 at a glance
The Danfoss 134L9594 is a 15 kW (20 HP) VLT HVAC Drive FC 102 for 3 × 525–690 V AC supplies, made for the fans, pumps and compressors in building services. It is a frame B2, IP21 / UL Type 1 unit, suitable for mounting in clean, dry indoor plant rooms.
This configuration has RFI class A1 (C2), brake chopper + Safe Stop, and a graphical LCP 102 control panel. 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 (C2). Check the permitted screened motor cable length in the Danfoss FC 102 Design Guide.
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 configuration, different power
This drive15 kWDanfoss 134L9594IP21 / UL Type 1 · frame B2
Larger75 kWDanfoss 134N0936IP21 / UL Type 1 · frame C2View 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 | 15 kW | |
|---|---|---|
| Voltage | 690 V | |
| Phase | Three Phase | |
| IP Rating | IP21 | |
| EMC Filter | Commercial | |
| Series | VLT® HVAC Drive FC 102 | |
| Part Number | 134L9594 | |
| Product type | AC variable frequency drive | |
| Rated output power | 15 kW (20 HP) | |
| Specific ratings | 11 kW at 525–550 V, 15 HP at 575 V, 15 kW at 690 V | |
| Output current | 18 A | |
| Input voltage | 525–690 V AC | |
| Input phases | 3-phase | |
| Output phases | 3-phase | |
| Protection rating | IP21 / Type 1 | |
| EMC Filter | RFI Class A1 / C2 | |
| Brake function | Brake chopper + Safe Stop | |
| Control panel | Graphical local control panel | |
| Mains option | No mains option | |
| PCB protection | Coated PCB | |
| Frame size | B2 | |
| Mounting type | Cabinet / panel mounting |
Frequently asked questions
Which communication protocols are built in?
Danfoss FC, Modbus RTU, BACnet MS/TP, Metasys N2 and FLN Apogee over the built-in RS-485 port. This unit has no fieldbus option card fitted, so PROFIBUS, PROFINET, EtherNet/IP or BACnet/IP would need an MCA option card.
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-102P15KT7E21H4UGCXXXSXXXXAXBXCXXXXDX
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 | 15 kW (20 HP) | P15K |
| Mains voltage Position 11–12 | 3 × 525–690 V AC | T7 |
| Enclosure Position 13–15 | IP21 / UL Type 1 | E21 |
| RFI filter Position 16–17 | RFI class A1 (C2) | H4 |
| Brake / Safe Stop Position 18 | Brake chopper + Safe Stop | U |
| Local control panel Position 19 | Graphical LCP 102 | G |
| PCB coating Position 20 | Conformal-coated PCBs | C |
| 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 | No fieldbus option | AX |
| 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 |
