Controller
C1050
Program
Zoning Rooftop
Supply
24 VAC, Class 2
Outputs
4 DO / 1 AO
Protocol
Modbus RTU (RS485)
Panel
NEMA 1, UL508A
Overview
The Prolon PL-PN1-4M is a pre-wired, UL508A certified NEMA 1 control panel built with one Prolon C1050 controller running the Zoning Rooftop Controller program, which operates rooftops or other mechanical HVAC systems, and acts as a master when used on a network with other Prolon zone controllers. Isolation relays on all digital outputs, overcurrent fuse protection and clearly marked terminal blocks come factory wired.
Program strategies include unoccupied mode settings, morning warm-up and supply air pre-heating and zone weight and network demand control strategy. The panel contains 1 Modbus RTU (RS485) node and runs stand-alone or on a Prolon network of up to 127 nodes.
Specifications per Prolon Pre-Wired One Controller Panel datasheet PL-DATA-PANEL1CON-EN-V1; Prolon PL-C1050-RTU Controller datasheet REV 7.3.0 / PL-DATA-C1050RTU-C/F-EN; Prolon C1050 Rooftop Controller Hardware Guide (RTU and RTUS) REV 7.3.3; Prolon One Controller Panel product page (proloncontrols.com) retrieved 2026-09-22. Reviewed September 2026.
Best For
- Zoned rooftop units with Prolon zone controllers
- Rooftops with on-or-off, pulsed or modulating heating outputs
- Rooftops that coordinate a network of Prolon zone controllers
Warranty
For warranty coverage on this Prolon panel, contact ZOT Supply at sales@zotsupply.com or 855-825-2811.
Key Features
Zoning master
Acts as the master on a network of Prolon zone controllers, with zone weighting and network demand strategies.
17A isolation relays
Every digital output is isolated by a relay rated 17A @ 277 VAC built into the panel (C1050 = 4), 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 panel wiring diagram is in the door, and all inputs and outputs are tested in the factory.
Reflash to another program
The C1050 keeps its full functionality, including the ability to reflash into a different controller program. Wiring diagrams are available free at proloncontrols.com.
Outputs wired in SOURCE mode
All 4 triac outputs are set to SOURCE mode because they share a single source supply, the equipment transformer.
Free Prolon Focus software
Remote monitoring and configuration with free Prolon Focus software, stand-alone or networked up to 127 nodes.
ZOT Supply is an authorized distributor of Prolon products.
Technical Specifications
| Panel | |
|---|---|
| Controller | Prolon C1050, Zoning Rooftop 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 | 12.25 in. W x 16.25 in. H x 6.25 in. D |
| Weight | 23 lbs (10.5 kg) |
| Isolation Relays | 17A @ 277 VAC on all digital outputs (C1050 = 4, M2000 = 5) |
| Environment | -4 to 122 °F (-20 to 50 °C), non-condensing |
| Panel Certification | Complete panel is UL508A 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 | Outdoor: thermistor 10K; Return: thermistor 10K; Supply: thermistor 10K; External clock or Proof of fan: 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) |
| 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 (max 16 AWG) |
| Zoning Rooftop Controller Program | |
| Program | Zoning Rooftop Controller |
| Application | Operates rooftops or other mechanical HVAC systems, and acts as a master when used on a network with other Prolon zone controllers |
| Program Inputs | Outdoor, return and supply: 10K thermistor; external clock or proof of fan: dry contact |
| Program Outputs | 4 triac outputs, all set to SOURCE mode because they share a single source supply (the equipment transformer); analog output: 1 output 0-10 VDC / 2-10 VDC / 0-5 VDC |
Documentation
Frequently Asked Questions
What is the Prolon PL-PN1-4M?
A pre-wired one controller panel built with a Prolon C1050 controller running the Zoning Rooftop Controller program, in a UL508A certified NEMA 1 enclosure with isolation relays on all digital outputs.
What does the zoning rooftop program control?
It operates rooftops or other mechanical HVAC systems, and acts as a master when used on a network with other Prolon zone controllers. Strategies include unoccupied mode settings, morning warm-up and supply air pre-heating and zone weight and network demand control strategy.
Which inputs does the PL-PN1-4M use?
Outdoor, return and supply: 10K thermistor; external clock or proof of fan: dry contact.
What power does the panel require?
24 VAC ±10%, 50/60 Hz, Class 2. The C1050 draws 2 VA (consumption), 32 VA (input).
Are the outputs isolated and protected?
Yes. Every digital output is isolated by a relay rated 17A @ 277 VAC built into the panel, the triac outputs are rated 300 mA max with resettable fuses, and the panel has a disconnect-style Slo-Blo fuse (3A @ 250 VAC) with a replacement fuse included.
How does the PL-PN1-4M communicate?
Modbus RTU (RS485), up to 127 nodes, at 9600 to 115200 baud. The panel contains 1 node and is configured with free Prolon Focus software.
What size is the PL-PN1-4M panel?
12.25 in. W x 16.25 in. H x 6.25 in. D, and it weighs 23 lbs (10.5 kg).
How are the digital outputs wired on the rooftop program?
All triac outputs are set to SOURCE mode because they share a single source supply, the equipment transformer.
- Panel Type:
- Single Controler Panel
- Display:
- No Display
- Controller Type:
- Rooftop
- Communication:
- Modbus RTU (RS485)
