

Description
Zehnder Caladair Freetime First Eco 3500
Product Part Number:
Caladair FREETIME 3500 First Eco - CAL24
Description ๐
The Zehnder Caladair Freetime First Eco 3500 is a high-performance, energy-efficient commercial heat recovery unit designed for industrial and commercial applications. Featuring advanced zoning controls, heating & cooling compatibility, and high-efficiency filtration, this unit ensures superior indoor air quality and optimal performance.
Additional Zoning Options ๐ง
Optional extras allow zone control via electric duct dampers, operated through:
- PIR Sensor โ Detects occupancy and increases airflow.
- COโ Sensor โ Detects high COโ levels and adjusts airflow.
- Wall Switch โ Manually increases airflow.
- Light Sensor โ Adjusts airflow when lights are switched on.
- BMS (Building Management System) โ Controls zoned areas and unit settings.
- Dampers โ Configurable to various airflow rates when open or closed.
For customization and additional zoning options, contact our sales team at 028 2827 5150.
Heating & Cooling Accessories ๐ก๏ธ
Available accessories include:
- Electric Preheater โ Prevents frost buildup.
- Electric Post Heater โ Increases room temperature.
- Water Heater โ Can be used as a pre-heater or post-heater.
Controllability โ๏ธ
A Digital Control Panel is available for use when not connected to a BMS system.
LCD Controller Functions:
- ๐ Weekly timer
- ๐๏ธ Holiday timer
- ๐ Summer by-pass / Night-time cooling
- โ ๏ธ Fault finding
- โก Speed parameters
- ๐ด Filter indicator
- ๐ฅ Fire alarm integration
- ๐ก๏ธ Temperature sensors
- ๐ก Integration via Modbus, Bacnet, or Web
Filtration ๐งผ
- 1x F7 large-capacity pollen intake filter
- 1x G4 extract filter
Construction ๐๏ธ
- Outer Construction: Airtight 10-gauge galvanized steel double-skin panels with 25mm high-density mineral wool insulation in accordance with EN1886.
- External Face: Pre-lacquered with a protective film in RAL 7035.
- Connections: Circular branch connections with rubber seals. Airtight construction to ATEC CSTB nยฐ 13-224-12.
- Mounting: Crimped hanging brackets for ceiling mounting.
Heat Exchanger ๐
- Highly efficient aluminium counter-flow heat exchanger that provides up to 90% heat recovery, designed for lifetime use.
Motors ๐
- 2x low-energy, high-efficiency backward curved EC motors with heat and speed protection.
Installation ๐
- The unit is horizontally mounted on the ceiling or floor with adjustable hanging brackets. Ensure the structure can support the unitโs weight.
- Condensate Drain: 15mm BSP metal pipe provided on the side of the unit, which should be connected to a drain via a waterless trap.
Dimensions ๐
Model | Length (mm) | Width (mm) | Height (mm) |
---|---|---|---|
Freetime 3500 | 1085 | 1420 | 1730 |
Installation of Ductwork ๐ ๏ธ
We recommend using Metal Spiral Ducting and fittings for superior strength. To ensure optimal airtightness and durability, use self-sealing fittings or a combination of Ducting Sealant and Aluminium Duct Sealing Tape.
Accessories ๐งฐ
A full range of controls, sensors, in-line silencers, floor/wall/ceiling inlets, and outlet diffusers are available to complete the installation.
Guarantee ๐
- 2-Year Parts Guarantee for peace of mind.
Please Note โ These units are built to order. For lead times on the Caladair Freetime Commercial Units, please contact our sales team at 028 2827 5150.