Specifications sourced from Prolon datasheet PL-DATA-M2000CHL-C/F-EN, REV 7.3.4. Verified September 18, 2026.
Overview
The M2000 CHL is a chiller plant controller for both air cooled and water cooled chillers. It stages chillers, rotates pumps and chillers on lead-lag, and resets the chilled water supply setpoint from outside air temperature, return temperature, or demand. Condenser water limits can lock out or stage down the chillers. Nine analog inputs are individually configurable for thermistor, dry contact, 4-20mA, or 0-5 VDC signals, and sequences are configured locally or remotely with the free Prolon Focus software.
Best For
- Air cooled or water cooled chiller plants staging up to 4 chillers
- Plants with VFD driven pumps held to a fixed water pressure setpoint
- Systems requiring condenser water lockout or stage-down protection
- Chilled water plants that need Modbus RTU integration without a proprietary supervisor
Warranty and Sourcing
Key Features
Up to 4 chiller stages
Stages multiple chillers, a single multistage chiller, or a combination of both.
Pump VFD control
Modulates a VFD for each pump to maintain a fixed water pressure setpoint.
Condenser water protection
Locks out or stages down chillers on entering or leaving condenser water temperature limits.
Flexible setpoint reset
Resets the supply water setpoint from outside temperature, return temperature, or demand.
Lead-lag rotation
Multiple lead-lag sequences are available for both the pumps and the chillers.
Pump disable input
A dedicated input deactivates the pumps on contact closure.
- Pump activity based on outside temperature or schedule (or both)
- Configurable pump exercise sequence for extended periods of inactivity
- Internal clock with configurable schedules and calendars
- A manual/off/auto switch for each of the eight outputs
- 5 digital outputs and 3 analog outputs equipped with resettable fuses
- Built-in protection sequences with configurable temperature limits and minimum delays
Technical Specifications
| Specification | PL-M2000-CHL |
|---|---|
| Supply | 24 VAC +/-10%, 50/60 Hz, Class 2 |
| Power | 5 VA (consumption), 40 VA (input) |
| Inputs | 9 analog inputs (outside temp / supply water temp / return water temp / dry contacts for proof of pumps, entering condenser water temp, leaving condenser water temp, water pressure and alarm). Input signals (thermistor / dry contact / 4-20mA / 0-5 VDC) individually configurable for each input |
| Digital Outputs | 5 triac outputs, 10-30 VAC source, 300 mA max (resettable fuse) |
| Analog Outputs | 3 x 0-10 VDC outputs, 40 mA max (resettable fuse) |
| Indication Lights (LED) | State of each output / Communication / Power / State of microprocessor |
| Microprocessor | PIC18F6722, 8 bits, 40 MHz, 128 KB FLASH memory |
| Casing | Molded ABS, UL94-HB |
| Communication | Modbus RTU (RS485), up to 127 nodes |
| Baud Rates | 9600, 19200, 38400, 57600, 76800, 115200 |
| Connection | Removable screw-type terminal blocks (max 16 AWG) and RJ45 modular jacks |
| Dimensions | 5.39 in x 4.41 in x 2.25 in (137 mm x 112 mm x 57 mm) |
| Weight | 1.05 lbs (0.48 kg) |
| Environment | -4 to 122 °F (-20 to 50 °C) Non-Condensing |
| Certification | UL916 Energy Management Equipment, CAN/CSA-C22.2, RoHS, FCC part 15: 2012 class B |
Documentation
Frequently Asked Questions
Does the PL-M2000-CHL work with air cooled and water cooled chillers?
Yes. The M2000 CHL is designed for both air cooled and water cooled chiller systems, and it can lock out or stage down chillers based on entering or leaving condenser water temperature limits.
Can the PL-M2000-CHL control pump VFDs?
Yes. It can modulate a VFD for each pump to maintain a fixed water pressure setpoint, using one of the 3 analog 0-10 VDC outputs.
How many chiller stages does the PL-M2000-CHL support?
Up to 4 chiller stages, covering multiple chillers, a single multistage chiller, or a combination, with lead-lag sequences for both pumps and chillers.
What input signal types does the PL-M2000-CHL accept?
Each of the 9 analog inputs is individually configurable for thermistor, dry contact, 4-20mA, or 0-5 VDC.
How does the PL-M2000-CHL communicate?
Modbus RTU over RS485, up to 127 nodes, at 9600 through 115200 baud. Connections are removable screw-type terminal blocks (max 16 AWG) and RJ45 modular jacks.
- Controller Type:
- Chiller
- Digital Outputs:
- 5
- Analog Outputs:
- 3
- Inputs:
- 9
- Communication:
- Modbus RTU (RS485)
- Product Series:
- M2000
