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Cooler FC9

The FC9 is Grayson’s largest hydrogen fuel cell cooler, delivering high-capacity air-to-liquid cooling for the most demanding stacks.

With a 9-fan brazed aluminium design, compatibility with de-ionised water, and options for waste heat recovery, the FC9 is built to protect critical fuel cell systems. Designed for rooftop mounting, this plug-and-play, low-maintenance solution ensures stable operation for heavy-duty FCEVs and stationary power applications.

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Overview

Large hydrogen fuel cell stacks demand high cooling capacity for efficiency and durability. The FC9 is Grayson’s flagship nine-fan cooler, delivering up to 172 kW of cooling at 40°C ambient.


This air-to-liquid passive system integrates nine long-life 24V DC brushless fans, a lightweight brazed aluminium heat exchanger, anti-vibration mounts, and a robust frame. PWM or CAN fan control is available, with optional reverse fan operation for debris clearing.

A plate heat exchanger enables waste heat recovery into vehicle HVAC, improving overall efficiency. Proven globally, the FC9 is a plug-and-play, low-maintenance solution for hydrogen FCEVs and stationary power systems, available off-the-shelf or customised to OEM requirements.

Features

Our coolers are equipped with features that ensure reliable heat dissipation, long-term durability, and ease of integration into vehicle systems.

  • Nine-fan high-capacity design: Provides the largest cooling performance in the Grayson FC-series for heavy-duty stacks.
  • Brazed aluminium heat exchanger: Lightweight, durable, and fully compatible with de-ionised water for safe FCEV operation.
  • Rooftop mounting: Packaged for large platforms requiring high airflow and straightforward vehicle integration.
  • PWM or CAN fan control: Smart regulation minimises energy draw and ensures precise cooling.
  • Reverse fan function: Clears dust and debris from the core to maintain thermal efficiency.
  • Waste heat recovery option: Plate heat exchanger enables HVAC integration to recycle stack heat and reduce energy demand.
  • Brushless fans (18–32V DC): Long-life, EMC R10 certified for reliability in automotive environments.
  • Plug-and-play system: Delivered pre-assembled for simple installation and commissioning.
  • Low maintenance design: Minimises servicing, ensuring maximum uptime.
Technical

Each technical component supports steady cooling performance, helping the system operate efficiently in diverse environments.

  • Rated cooling capacity: 172 kW @ 40°C ambient, 290 l/min, 61°C coolant
  • Ambient operating temperature: -30°C to +50°C
  • Nominal voltage: 24V DC
  • Current draw: 288A (32A per fan)
  • Fans: 9 × 24V DC axial fans
  • Pressure drop: 189 mbar
  • Maximum working pressure: 1.5 bar
  • Dimensions (L × W × H): 1400 × 1319 × 394 mm
  • Weight (dry): 211 kg
  • Coolant type: Ethylene-glycol mix / de-ionised water compatible
  • Materials: Brazed aluminium heat exchanger, mild steel frame (powder coated)
  • Inlet/outlet size: 51 mm
  • Connectors: DELPHI METRI-PACK 150-480
Cooling Capacity

172 kW rated

High-capacity cooling performance for large stacks and heavy-duty duty cycles.
Power Supply

24V DC

Standard electrical configuration for all FC9 models.
Control Compatibility

PWM / CAN control

Enables precise fan speed regulation for efficient operation.
Coolant Compatibility

De-ionised water

Safe for use in hydrogen fuel cell cooling circuits.
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Compatible Applications

Product Benefits​

Discover why on- and off-highway OEMs trust Grayson’s FC9 line of hydrogen fuel coolers in their latest generation applications.

Maximum cooling performance

Rated 172 kW capacity supports the largest hydrogen fuel cell systems.

Smart fan control

CAN or PWM regulation ensures efficient operation and reduced power draw.

Waste heat recovery

Optional plate exchanger repurposes heat into HVAC systems for energy saving.

Low maintenance

Reverse fan cleaning and durable construction minimise service downtime.

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Our Capabilities

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We work with OEMs to calculate the most suitable cooler, or develop a custom cooler, for your thermal requirements, based on your ambient temperature limit, coolant flow rate (l/min), heat rejection (kW) and desired coolant temperature. Learn More

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Discover More About Grayson

For over four decades, Grayson Thermal Systems has been developing reliable heating and cooling technologies for vehicles worldwide. Our commitment to quality and technical expertise keeps systems efficient and dependable.