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Prolon PL-M2000-FCU fan coil unit controller

Prolon PL-M2000-FCU : Fan Coil Unit Controller, 2-Pipe and 4-Pipe Hydronic, Automatic Changeover, 8 Configurable Universal Inputs, 5 Triac Outputs, 3 Analog Outputs, Modbus RTU (RS485)

Prolon

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SKU:
PL-M2000-FCU
Condition:
New
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Controller TypeFan Coil Unit Controller
Inputs8 configurable universal inputs
Digital Outputs5 triac, 10-30 VAC source
Analog Outputs3 x 0-10 VDC, 40 mA max
ProtocolModbus RTU (RS485)
Supply24 VAC, Class 2
The Prolon PL-M2000-FCU is a Modbus RTU fan coil unit controller for 2-pipe and 4-pipe hydronic heating and cooling, with automatic changeover on 2-pipe systems and 8 configurable universal inputs for 10k-3 thermistor and dry contact signals.

Specifications sourced from Prolon datasheet PL-DATA-M2000FCU-C/F-EN, REV 7.4.0. Verified September 18, 2026.

Overview

The M2000 FCU controls 2-pipe and 4-pipe hydronic fan coil units from a single space temperature sensor. On 2-pipe systems it changes over automatically between heating and cooling based on water temperature, and it runs automatic purge cycles to verify water temperature and prevent stagnation in the coils. Valves can be driven on/off or modulating, with a separate on/off or PWM modulating auxiliary heat output, and multi-speed fan control. Zone demand data is shared when the controller is connected to a Prolon network.

Best For

  • 2-pipe and 4-pipe fan coil units controlled from one space temperature sensor
  • 2-pipe buildings that need automatic seasonal changeover at the unit
  • Fan coils with a secondary or backup electric heat stage
  • Hydronic zones that need coil purge cycles to prevent stagnation

Warranty and Sourcing

ZOT Supply is an authorized Prolon distributor. Every PL-M2000-FCU ships new in factory packaging and is covered by the Prolon manufacturer warranty. For current warranty terms and RMA handling, contact ZOT Supply at 855-825-2811 or sales@zotsupply.com.

Key Features

2-pipe and 4-pipe

Controls 2-pipe and 4-pipe hydronic heating and cooling units.

Automatic changeover

Changes over automatically between heating and cooling on 2-pipe systems.

On/off or modulating valves

Valve control for both heating and cooling is on/off or modulating.

Separate aux heat output

A separate on/off or modulating (PWM) auxiliary heat output is available.

Multi-speed fan control

Multi speed fan control options are built into the sequence.

Universal inputs

8 configurable universal inputs accept 10k-3 thermistor and dry contact signals.

  • Designed for hydronic systems controlling a space temperature using a single space temperature sensor
  • Automatic purge cycles to verify water temperature and prevent stagnation in coils
  • Internal clock with configurable schedules and calendars
  • Configurable unoccupied mode sequences
  • A manual/off/auto switch for each of the eight outputs
  • 5 digital outputs and 3 analog outputs equipped with self-resetting fuses
  • Several configurable safety and efficiency limits available

Technical Specifications

SpecificationPL-M2000-FCU
Supply24 VAC +/-10%, 50/60 Hz, Class 2
Power5 VA (consumption), 40 VA (input)
Inputs8 configurable universal inputs (outside temp / hot and cold-water supply temps / supply air / leak alarm / proof of fan / room setpoint / zone temperature / Alarm input). Input signals (10k-3 thermistor / dry contact)
Digital Outputs5 triac outputs, 10-30 VAC source, 300 mA max (self-resetting fuse)
Analog Outputs3 x 0-10 VDC outputs, 40 mA max (self-resetting fuse)
Indication Lights (LED)State of each output / Communication / Power / State of microprocessor
MicroprocessorPIC18F6722, 8 bits, 40 MHz, 128 KB FLASH memory
CasingMolded ABS, UL94-HB
CommunicationModbus RTU (RS485), up to 127 nodes
Baud Rates9600, 19200, 38400, 57600, 76800, 115200
ConnectionRemovable screw-type terminal blocks (max 16 AWG) and RJ45 modular jacks
Dimensions5.39 in x 4.41 in x 2.25 in (137 mm x 112 mm x 57 mm)
Weight1.05 lbs (0.48 kg)
Environment-4 to 122 °F (-20 to 50 °C) Non-Condensing
CertificationUL916 Energy Management Equipment, CAN/CSA-C22.2, RoHS, FCC part 15: 2012 class B

Documentation

PDFProlon PL-M2000-FCU Fan Coil Unit Controller Datasheet (REV 7.4.0)
PDFProlon Fan Coil Unit Controller Focus Guide
PDFProlon M2000-FCU Hardware Guide
PDFProlon M2000 Fan Coil Modbus Configuration Properties
PDFProlon M2000 Series Quick Start Guide

Frequently Asked Questions

How many inputs does the PL-M2000-FCU have?

8 configurable universal inputs. They cover outside temp, hot and cold-water supply temps, supply air, leak alarm, proof of fan, room setpoint, zone temperature, and an alarm input.

What input signal types does the PL-M2000-FCU accept?

10k-3 thermistor and dry contact signals.

Does the PL-M2000-FCU handle 2-pipe changeover?

Yes. On 2-pipe systems it changes over automatically between heating and cooling, and it runs automatic purge cycles to verify water temperature and prevent stagnation in the coils.

Can the PL-M2000-FCU control auxiliary heat?

Yes. A separate auxiliary heat output is available and can be driven on/off or as a modulating PWM output, independent of the heating and cooling valve outputs.

What outputs does the PL-M2000-FCU provide?

5 triac digital outputs rated 10-30 VAC source, 300 mA max with a self-resetting fuse, plus 3 analog outputs at 0-10 VDC, 40 mA max with a self-resetting fuse.

Controller Type:
Fan Coil
Digital Outputs:
5
Analog Outputs:
3
Inputs:
8
Communication:
Modbus RTU (RS485)
Product Series:
M2000
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