Controller
C1050
Program
Humidity
Supply
24 VAC, Class 2
Outputs
2 DO / 1 AO
Protocol
Modbus RTU (RS485)
Panel
NEMA 1, UL508A
Overview
The Prolon PL-PN1-4P is a pre-wired, UL508A certified NEMA 1 control panel built with one Prolon C1050 controller running the Humidity Controller program, which regulates the relative humidity level in a room or return duct, with both humidification and dehumidification sequences. Isolation relays on all digital outputs, overcurrent fuse protection and clearly marked terminal blocks come factory wired.
Program strategies include outdoor temperature reset, unoccupied mode setpoint offsets, supply high humidity limit and fan reactivation request in night mode. 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-HU Controller datasheet REV 7.3.1 / PL-DATA-C1050HU-C/F-EN; Prolon C1050 Humidifier Controller Hardware Guide REV 7.3.2; Prolon One Controller Panel product page (proloncontrols.com) retrieved 2026-09-22. Reviewed September 2026.
Best For
- Room or return duct humidity control
- Humidification and dehumidification from one controller
- Humidification setpoint reset by outdoor temperature
Warranty
For warranty coverage on this Prolon panel, contact ZOT Supply at sales@zotsupply.com or 855-825-2811.
Key Features
Humidify and dehumidify
Humidification and dehumidification sequences, with outdoor temperature reset and a supply high humidity limit.
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.
Onboard diagnostic LEDs
Onboard LEDs show the state of each output, communication, power and the microprocessor for quick diagnostics.
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, Humidity 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 | Outside air: thermistor 10K; Return/room humidity: 0-5 / 0-10 VDC; Supply humidity: 0-5 / 0-10 VDC; Proof of fan: dry contact |
| Digital Outputs | 2 triac outputs, 10-30 VAC source or sink, 300 mA max (resettable fuse) |
| Analog Outputs | 1 output 0-10 VDC / 2-10 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) |
| Humidity Controller Program | |
| Program | Humidity Controller |
| Application | Regulates the relative humidity level in a room or return duct, with both humidification and dehumidification sequences |
| Program Inputs | Outside air: 10K thermistor; return/room humidity and supply humidity: 0-5 / 0-10 VDC; proof of fan: dry contact |
| Program Outputs | 2 triac outputs, 10-30 VAC source or sink, 300 mA max (resettable fuse); analog output: 1 output 0-10 VDC / 2-10 VDC, 40 mA max (resettable fuse) |
Documentation
Frequently Asked Questions
What is the Prolon PL-PN1-4P?
A pre-wired one controller panel built with a Prolon C1050 controller running the Humidity Controller program, in a UL508A certified NEMA 1 enclosure with isolation relays on all digital outputs.
What does the humidity program control?
It regulates the relative humidity level in a room or return duct, with both humidification and dehumidification sequences. Strategies include outdoor temperature reset, unoccupied mode setpoint offsets, supply high humidity limit and fan reactivation request in night mode.
Which inputs does the PL-PN1-4P use?
Outside air: 10K thermistor; return/room humidity and supply humidity: 0-5 / 0-10 VDC; 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-PN1-4P 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-PN1-4P panel?
12.25 in. W x 16.25 in. H x 6.25 in. D, and it weighs 23 lbs (10.5 kg).
- Panel Type:
- Single Controler Panel
- Display:
- No Display
- Controller Type:
- Humidity
- Communication:
- Modbus RTU (RS485)
