Controller 1
C1050 Boiler
Controller 2
M2000 Boiler
Supply
24 VAC, Class 2
Relays
17A @ 277 VAC
Protocol
Modbus RTU (RS485)
Panel
NEMA 1, UL listed
Overview
The Prolon PL-PN2-4C-7C is a pre-wired, UL listed NEMA 1 two controller panel built with a Prolon C1050 Boiler Controller and a Prolon M2000 Boiler Controller. Isolation relays rated 17A @ 277 VAC on all digital outputs, overcurrent fuse protection and clearly marked terminal blocks come factory wired.
The C1050 Boiler Controller operates staged boilers, as well as the associated pumps and valves. The M2000 Boiler Controller runs staged or modulating boiler sequences with their pumps. The panel contains 2 Modbus RTU (RS485) nodes and runs stand-alone or on a Prolon network of up to 127 nodes.
Specifications per Prolon Pre-Wired Two Controller Panel datasheet PL-DATA-PANEL2CON-EN-V1; Prolon PL-C1050-BLR Controller datasheet REV 7.3.0 / PL-DATA-C1050BLR-C/F-EN; Prolon PL-M2000-BLR Controller datasheet REV 7.3.0 / PL-DATA-M2000BLR-C/F-EN; Prolon C1050 Boiler Controller Hardware Guide REV 7.3.2; Prolon M2000 Series Quick Start Guide REV 7.0 / PL-QCK-M2000-EN; Prolon Two Controller Panel product page (proloncontrols.com) retrieved 2026-09-24. Reviewed September 2026.
Best For
- Staged boiler plants with lead-lag boilers and pumps
- Staged boiler plants up to 4 stages
- Mechanical rooms where two controllers share one UL listed enclosure
Warranty
For warranty coverage on this Prolon panel, contact ZOT Supply at sales@zotsupply.com or 855-825-2811.
Key Features
Two independent controllers
Controllers need not be related in function and may each serve completely different sequences from separate power sources.
17A isolation relays
Every digital output is isolated by a relay rated 17A @ 277 VAC built into the panel (C1050 = 4, M2000 = 5), and the controller outputs are protected by resettable fuses.
Fused, pre-wired NEMA 1 panel
Clearly marked terminal blocks, wire management channels and a disconnect-style Slo-Blo fuse (3A @ 250 VAC) with a replacement fuse included. The wiring diagram is in the door, and all inputs and outputs are tested in the factory.
C1050: Staged boiler sequencing
Operates staged boilers with their pumps and valves, with lead-lag sequences, outside temperature reset and pump exercise intervals.
M2000: Staged or modulating boilers
Wiring configurations cover staged boilers (4 boiler stage outputs plus pumps) and modulating boilers driven from the analog outputs.
Reflash to another program
Each controller keeps its full functionality, including the ability to reflash into a different controller program. Wiring diagrams are available free at proloncontrols.com.
ZOT Supply is an authorized distributor of Prolon products.
Technical Specifications
| Panel | |
|---|---|
| Controllers | Prolon C1050, Boiler Controller program + Prolon M2000, Boiler Controller program |
| Supply | 24 VAC ±10%, 50/60 Hz, Class 2 |
| Overcurrent Protection | Disconnect-style Slo-Blo fuse (3A @ 250 VAC), with additional replacement fuse included |
| Enclosure | NEMA 1 |
| Panel Dimensions | 16.25 in. W x 20.25 in. H x 6.25 in. D (413 mm W x 514 mm H x 159 mm D) |
| Weight | 38 lbs (17.25 kg) |
| Isolation Relays | 17A @ 277 VAC on all digital outputs (C1050 = 4, M2000 = 5) |
| Network Nodes | Stand-alone or networked (up to 127 nodes); this panel contains 2 nodes |
| Environment | -4 to 122 °F (-20 to 50 °C), non-condensing |
| Panel Certification | Complete panel is UL certified |
| Certification | UL916 Energy Management Equipment, CAN/CSA-C22.2, RoHS, FCC part 15: 2012 class B |
| C1050 Controller Hardware | |
| Power | 2 VA (consumption), 32 VA (input) |
| Inputs | Outside air: thermistor 10K; Return Water: 10 K thermistor; Supply Water: 10 K thermistor; Proof of pump: dry contact |
| Digital Outputs | 4 triac outputs, 10-30 VAC source or sink, 300 mA max (resettable fuse) |
| Analog Outputs | 1 output 0-10 VDC / 2-10 VDC / 0-5 VDC, 40 mA max (resettable fuse) for the valve |
| Indication Lights (LED) | State of each output / Communication / Supply / State of microprocessor |
| 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 (16 AWG max) |
| Boiler Controller Program | |
| Program | Boiler Controller |
| Application | Operates staged boilers, as well as the associated pumps and valves |
| Program Inputs | Outside air, return water and supply water: 10K thermistor; proof of pump: dry contact |
| Program Outputs | 4 triac outputs; analog output: 1 output 0-10 VDC / 2-10 VDC / 0-5 VDC for the valve |
| M2000 Controller Hardware | |
| Power | 5 VA (consumption), 40 VA (input) |
| Inputs | 7 configurable analog inputs (outside temp / supply temp / return temp / dry contacts for proof of pumps, max heat request and boiler disable). 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 |
| 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 (16 AWG max) and RJ45 modular jacks |
| Boiler Controller Program | |
| Program | Boiler Controller |
| Application | Runs staged or modulating boiler sequences with their pumps |
| Program Inputs | Outside air, supply water and return water: 10K thermistor; proof of pump 1, proof of pump 2, use max heat setpoint and disable boiler call: dry contact |
| Program Outputs | Staged: DO1-DO4 boiler stages, DO5 pump 1, AO1 pump 2, AO3 valve (0-10 / 2-10 / 0-5 VDC). Modulating: AO2 and AO3 modulating boiler stages (0-10 / 2-10 / 0-5 VDC) |
Documentation
Frequently Asked Questions
What is the Prolon PL-PN2-4C-7C?
A pre-wired two controller panel built with a Prolon C1050 Boiler Controller and a Prolon M2000 Boiler Controller, in a UL listed NEMA 1 enclosure with 17A isolation relays on all digital outputs.
What does the C1050 boiler program control?
It operates staged boilers, as well as the associated pumps and valves. Strategies include outside temperature reset, lead-lag sequences and pump exercise intervals.
What does the M2000 boiler program control?
It runs staged or modulating boiler sequences with their pumps. Strategies include staged boiler configuration and modulating boiler configuration.
What power does the panel require?
24 VAC ±10%, 50/60 Hz, Class 2; the C1050 draws 2 VA (consumption), 32 VA (input) and the M2000 draws 5 VA (consumption), 40 VA (input).
Can the two controllers serve different equipment?
Yes. The controllers need not be related in function and may each serve completely different sequences from separate power sources.
Are the outputs isolated and protected?
Yes. Every digital output is isolated by a relay rated 17A @ 277 VAC built into the panel, and the panel has a disconnect-style Slo-Blo fuse (3A @ 250 VAC) with a replacement fuse included.
What size is the PL-PN2-4C-7C panel?
16.25 in. W x 20.25 in. H x 6.25 in. D (413 mm W x 514 mm H x 159 mm D), and it weighs 38 lbs (17.25 kg).
- Panel Type:
- Dual Controller Panel
- Display:
- No Display
- Controller Type:
- Boiler
- Communication:
- Modbus RTU (RS485)
