Controller 1
C1050 FlexIO
Controller 2
C1050 Heat Pump
Supply
24 VAC, Class 2
Relays
17A @ 277 VAC
Protocol
Modbus RTU / BACnet MS/TP
Panel
NEMA 1, UL listed
Overview
The Prolon PL-PN2-4F-4G is a pre-wired, UL listed NEMA 1 two controller panel built with a Prolon C1050 FlexIO Controller and a Prolon C1050 Zoning Heat Pump Controller. Isolation relays rated 17A @ 277 VAC on all digital outputs, overcurrent fuse protection and clearly marked terminal blocks come factory wired.
The C1050 FlexIO Controller is a general purpose HVAC controller whose inputs and outputs can be individually configured for applications not covered by a dedicated Prolon program. The C1050 Zoning Heatpump Controller operates residential or commercial heatpump equipment using PI control loops, and acts as a master when networked with Prolon zone controllers. 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-FLX Controller datasheet REV 7.3.0 / PL-DATA-C1050FLX-C/F-EN; Prolon PL-C1050-HP Controller datasheet REV 7.3.0 / PL-DATA-C1050HP-C/F-EN; Prolon C1050 FlexIO Controller Hardware Guide REV 7.3.2; Prolon C1050 Heatpump Controller Hardware Guide (HP and HPS) REV 7.3.2; Prolon Two Controller Panel product page (proloncontrols.com) retrieved 2026-09-24. Reviewed September 2026.
Best For
- Outlying HVAC functions not covered by a dedicated Prolon program
- Zoned heat pump systems with Prolon zone controllers
- 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: Up to 5 occupancy states
Can receive up to 5 different occupancy states from an NC2000, and outputs can act on any local input or on network data.
C1050: Zoning master
Acts as the master when used on a network with Prolon zone controllers, analyzing zone demand to drive the heat pump.
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, FlexIO Controller program + Prolon C1050, Zoning Heatpump 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 | 3 analog inputs with individually configurable signal ranges (thermistor, dry contact, 0-5 VDC, 1-5 VDC, 0.5-4.5 VDC, 0-10 VDC), and 1 digital input |
| 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 (16 AWG max) |
| FlexIO Controller Program | |
| Program | FlexIO Controller |
| Application | Is a general purpose HVAC controller whose inputs and outputs can be individually configured for applications not covered by a dedicated Prolon program |
| Program Outputs | 4 triac outputs; analog output: 1 output 0-10 VDC / 2-10 VDC / 0-5 VDC |
| C1050 Controller Hardware | |
| Power | 2 VA (consumption), 32 VA (input) |
| Inputs | 4 configurable inputs with selectable functions (outside temp / return temp / supply temp / water intake temp / night setback / proof of fan / alarm) |
| Digital Outputs | 4 triac outputs, 10-30 VAC source, 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) or BACnet MS/TP (RS485) up to 127 nodes |
| Baud Rates | 9600, 19200, 38400, 57600, 76800, 115200 |
| Connection | Removable screw-type terminal blocks (16 AWG max) |
| Zoning Heatpump Controller Program | |
| Program | Zoning Heatpump Controller |
| Application | Operates residential or commercial heatpump equipment using PI control loops, and acts as a master when networked with Prolon zone controllers |
| Program Outputs | 4 triac outputs, all set to SOURCE mode because they share a single source supply (the equipment transformer), 300 mA max (resettable fuse); analog output: 1 output 0-10 VDC / 2-10 VDC / 0-5 VDC |
Documentation
Frequently Asked Questions
What is the Prolon PL-PN2-4F-4G?
A pre-wired two controller panel built with a Prolon C1050 FlexIO Controller and a Prolon C1050 Zoning Heat Pump Controller, in a UL listed NEMA 1 enclosure with 17A isolation relays on all digital outputs.
What does the C1050 flexio program control?
It is a general purpose HVAC controller whose inputs and outputs can be individually configured for applications not covered by a dedicated Prolon program. Strategies include ON/OFF, PI loop, direct or reverse acting, and pulsed output logic, output interlocks and overrides based on outside temperature and/or occupancy.
What does the C1050 zoning heatpump program control?
It operates residential or commercial heatpump equipment using PI control loops, and acts as a master when networked with Prolon zone controllers. Strategies include unoccupied mode settings, morning warm-up and supply air pre-heating.
What power does the panel require?
24 VAC ±10%, 50/60 Hz, Class 2; each C1050 draws 2 VA (consumption), 32 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-PN2-4F-4G 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).
How are the C1050 digital outputs wired?
On the C1050 heat pump program, all triac outputs are set to SOURCE mode because they share a single source supply, the equipment transformer.
Does the C1050 heat pump controller support BACnet?
Yes. The C1050 heat pump controller communicates over Modbus RTU (RS485) or BACnet MS/TP (RS485), up to 127 nodes.
- Panel Type:
- Dual Controller Panel
- Display:
- No Display
- Controller Type:
- FlexIO
- Controller Type:
- Heat Pump
- Communication:
- Modbus RTU (RS485)
- Communication:
- BACnet MS/TP (RS485)
