PDWC High ESP Ducted
The Polar Air PDWC high ESP ducted, hydronic fan coil delivers powerful heating and cooling up to 26 kW in a compact, concealed design.
It features interchangeable water coil connections for installation and reduced dimensions, making it suitable for challenging spaces in complex projects.
Designed for external static pressures up to 180 Pa (0.8 in.wg), with a recommended operating point of 120 Pa (0.5 in.wg), the PDWC is suited to ductwork with longer runs, multiple bends, or higher resistance from fittings and filters.
It is suited for industrial, commercial, government, and healthcare applications, such as manufacturing plants, shopping malls, large data centers, hospitals, and public buildings.
8 sizes available · 2-pipe or 4-pipe models · 3R, 4R, 3R+1 & 4R+2 configurations
Advantages
Heating & Cooling
Capacities up to 26 kW provides powerful cooling in summer and reliable heating in winter, for year-round comfort.
Ideal for various applications, including industrial, healthcare and commercial buildings, including transport terminals, hospitals and factories.
Adaptable Design
Interchangeable coil connections simplify installation, whilst compact dimensions fit easily into concealed or challenging spaces.
Plus an optional G4 (MERV 8) filter upgrade captures finer particles, supporting cleaner air quality in environments that need it like healthcare.
Multiple rows: 3R, 4R, 3R+1 & 4R+2
Multiple coil row configurations provide greater surface area for heat transfer, delivering higher efficiency and more cooling and heating capacity.
The added surface also improves latent capacity for better humidity control and more consistent comfort across varying load conditions.
ESP Conditions
Medium external static pressures from 50 - 180 Pa (0.2 - 0.8 in.wg), recommended 120 Pa (0.5 in.wg).
Suitable for complex or large projects with long duct runs, multiple bends, and higher resistance from grilles, dampers, and filters.
Models
Includes both a 2-pipe and 4-pipe model, and available in 8 sizes to suit complex applications like hospitals.
The 4-pipe allows heating in one area and cooling in another simultaneously, ideal for buildings with varied thermal loads like north/south-facing zones or occupancy.
Installation & Maintenance
Supplied ready to install, cutting time and cost, with external painted steel drain pan, 5 mm (0.2”) NBR insulation, manual air vent + water purge valve and G2 (MERV 4) filter.
Capacities
Metric
🍃 Airflow: 259 – 4534 m3/h
❄️ Cooling: 1.9 – 26.5 kW
☀️ Heating: 1.4 – 24.5 kW
🔊 Sound pressure: from 43 dBA*
Imperial
🍃 Airflow: 152 – 2762 CFM
❄️ Cooling: 6246 – 89369 BTU/Hr | 0.5 – 7.4 Ton
☀️ Heating: 5365 – 138928 BTU/Hr | 0.4 – 11.6 Ton
🔊 Sound pressure: from 43 dBA*
* Sound pressure level measured at 1 m distance in a reverberation test room with the minimum volume of 200 m3.
- Compatible with renewable energy systems – works with solar thermal collectors, heat pumps, and other low-temperature sources for higher energy savings.
- Durable coil design – copper tubes and headers mechanically expanded into corrugated aluminum fins, pressure-tested up to 35 bar with a 16-bar operating limit.
- 0–10 VDC EC motor – delivers up to 30% energy savings compared to AC motors, with smoother speed control, quieter operation, and lower running costs.
- Manual air vent + water purge valve – enables quick and efficient system bleeding for hassle-free maintenance.
- External drain pan – in painted steel to safely collect and channel condensate, protecting interiors from leaks, water damage, and moisture issues.
- 5 mm (0.2”) NBR insulation – minimizes energy loss and prevents condensation for long-lasting efficiency.
- G2 (MERV 4) filter – captures dust and larger particles to improve indoor air quality and protect the coil.
- I-Type Controllers: Infrared Handset or Wired Wallpad
- Valves: HYDRO+ VALVE Kit with 2/3-way body valve, on-off/modulating actuator (24V or 110-240V), BSPT or NPT connectors, connection piping kit, 2x shut-off valves, strainer and manual balancing valve
- Condensate pump: Sauermann with float switch
- Electric heater: up to 6 kW
- Insulation: 10 mm (0.3”), 15 mm (0.6”) or 25 mm (1”) NBR
- Filter: G4 (MERV 8)
- Integrated transformer: converts from 230V to 24V for valve and thermostat compatibility
- Disconnect switch: integrated in control box
- Customization: available upon request (minimum order quantities apply)
Polar Air Control Logic
Polar Air fan coil units provide exceptional control flexibility to meet various application needs. Choose between two types of PCBs.
I-Type Control
Exclusively developed by Polar Air for intelligent control that includes our ADBS technology for ΔT management and group control. Configuration for 2- and 4-pipe models.
Available through ModBus, or compatible with Polar Air Wired Wallpad or Infrared Handset.
24/7 programming
Auto & 3-Speed functions
Sleep function
Auto-Restart function
Dehumidification mode
Adjustable swing louver positioning
Condensate drain pump control
Error diagnostics on unit LED display or Wired Wallpad
Valve control
Dry contact for On/Off applications
Electric heater control
2 x 24V auxiliary contacts for ERVS or dampers
Building Management Systems (BMS) compatible via Modbus
Auto-Dynamic Balancing System with constant ΔT management
255 units group control via ModBus
32 units group control via Wired Wallpad
I-Type Control
Exclusively developed by Polar Air for intelligent control that includes our ADBS technology for ΔT management and group control. Configuration for 2- and 4-pipe models.
Available through ModBus, or compatible with Polar Air Wired Wallpad or Infrared Handset.
24/7 programming
Auto & 3-Speed functions
Sleep function
Auto-Restart function
Dehumidification mode
Adjustable swing louver positioning
Condensate drain pump control
Error diagnostics on unit LED display or Wired Wallpad
Valve control
Dry contact for On/Off applications
Electric heater control
2 x 24V auxiliary contacts for ERVS or dampers
Building Management Systems (BMS) compatible via Modbus
Auto-Dynamic Balancing System with constant ΔT management
255 units group control via ModBus
32 units group control via Wired Wallpad
W-Type Control
Simple yet flexible functionality that is easy to use, allowing for limited LED diagnostics and RPM configuration. Available for 2- and 4-pipe models.
Compatible with external thermostats from a variety of manufacturers.
Choose your own external thermostats
Configure the motor RPMs to your choice
Contact alarm for condensate drain pump and motor
Limited error diagnostics on unit LED display or Wired Wallpad
Project applications & references
Explore recommended applications and recent projects where it’s been successfully installed.
Government
Post Offices · Courthouses · Town Halls · Embassies · Prisons · Military & Emergency Spaces
Healthcare
Hospitals · Clinics · Nursing Homes · Treatment Centers · Laboratories · Morgues
Commercial
Supermarkets · Stores · Shopping Malls · Gyms/Sports Facilities · Museums/Theaters · Airports/Transport Terminals
Industrial
Factories/Plants · Data Centers · Warehouses/Distribution Centers · Wine Cellars/Wineries · Agricultural
Private Residence Ardglass
2025
United Kingdom
New construction · EC motor · single private home
First West Credit Union
2019
United States
Virginia
Al Reziza Tower
2015
Saudi Arabia
New construction · EC motor · mixed use commercial spaces
Hilton Hotel
2017
South Africa
Sanura Apartments
2025
Australia
Retrofit · EC motor · I-Type control · condo/apartment blocks
Travis Park
2024
United States
Texas
Serena Del Mar (Castelo)
2024
Colombia
New construction · EC motor · district cooling · condo/apartment blocks
200 Elgin Street
2025
Canada
Ontario
Retrofit · EC motor · W-Type control · condo/apartment blocks
IASO Retirement
2021
Greece
Sheraton Gunter Hotel
2024
United States
Texas
Retrofit · EC motor · hotel facilities
Monde Condos
2017
Canada
Ontario
New construction · EC motor · condo/apartment blocks
White Square Tower
2016
Qatar
Serena Del Mar (Meraki)
2024
Colombia
New construction · EC motor · district cooling · condo/apartment blocks
Rock Lititz Studios
2025
United States
Pennsylvania
New construction · EC motor · offices & music recording studios
Serena Del Mar
2022
Colombia
New construction · EC motor · district cooling · condo/apartment blocks
Luna Vista Toronto
2025
Canada
Ontario
Bolnica Sisak Hospital
2024
Croatia
Retrofit · EC motor · hospital wards & public areas
Our PASELECT Software is specifically designed to help users choose the most suitable Polar Air fan coils for any project.
Downloads: IOMs, Revits & Guide Specs
Access product resources including installation and operation manuals (IOMs), Revit files, and guide specifications.
Revit Files: PDWC_High ESP Ducted_4-pipe
|Size: 3 MB - ENRevit Files: PDWC_High ESP Ducted_2-pipe
|Size: 4 MB - ENIOM: PDWC High ESP Ducted_METRIC_EC Motor
|Size: 23 MB - EN
Revit Files: PDWC_High ESP Ducted_4-pipe
|Size: 3 MB - ENRevit Files: PDWC_High ESP Ducted_2-pipe
|Size: 4 MB - ENIOM: PDWC High ESP Ducted_IMPERIAL_EC Motor
|Size: 4 MB - ENOur trusted network of authorized representatives ensures you receive exceptional customer service and product availability worldwide.
FAQs: high ESP ducted
What row configurations are available for the PDWC Ducted?
The PDWC is available in 3R, 3R+1, 4R, and 4R+2 coil configurations.
Increasing the number of rows expands coil surface area, which improves heat transfer and allows the unit to achieve higher capacities in the same footprint. More rows also enhance latent performance, providing better humidity control in demanding climates.
For projects using low-temperature heat sources such as heat pumps or solar thermal systems, additional coil rows improve efficiency by increasing the contact time between air and water, ensuring effective output at lower water temperatures.
What ESP capacity does the PDWC have?
PDWC High ESP Capacities:
Total: 50 – 180 Pa (0.2 – 0.8 in.wg).
Recommended: 120 Pa (0.5 in.wg)
What can high ESP fan coils work with?
High ESP fan coils typically operate in the range of 130–200 Pa (0.5–0.8 in.wg) and can be integrated with systems that add higher resistance to airflow. They are well-suited for variable airflow and zoning systems, where dampers open and close to regulate distribution, as well as installations with advanced filtration or air treatment modules.
They can also be paired with low-temperature heat sources such as heat pumps or district energy systems, especially when configured with additional coil rows to maintain output at lower supply water temperatures.
For projects in regions with high humidity, the Polar Air PDWD double-skin ducted unit may be a better alternative, offering enhanced thermal insulation and moisture protection.
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