Coolant Refill Carts for AI Racks & CDUs
Get liquid cooling loops filled, flushed, and ready for operation faster. Gradian’s self-contained refill carts combine high-flow coolant charging with integrated filtration to simplify commissioning and ongoing maintenance of liquid-cooled racks and CDUs.
200L Visible-Level Tank
Fills Up to 8 CDUs Simultaneously
Two-Stage 25μm Filtration
UQD & FD83 Quick-Connect Couplings
What makes a Gradian Refill Cart?
High-Capacity, High-Pressure Fill
A 200L visible-level tank charges coolant at up to 60 LPM total output and up to 36 psi (2.5 bar), with up to 8 CDU units fillable simultaneously.
Two-Stage Filtration
25μm filtration on both the tank-fill path and the dispensing path keeps particulates out of the loop during both tank refill and system charging.
Universal Connections, Wide-Range Power
UQD08 supply and return ports on the cart, with UQD04 and FD83 accessory hoses for direct connection, a 1" tri-clamp flushing port, and wide-range 90–264VAC input.
Technical specifications
| Charging Flow Rate (Total) | ≥60 LPM |
|---|---|
| Single-Node Flow | 6–7 LPM (60 LPM via flush port) |
| Max Output Pressure | 29–36 psi (2–2.5 bar) |
| Tank Volume | 200L, liquid-level visible |
| Filtration | 25μm, two-stage |
| Simultaneous Fill Capacity | Up to 8 CDU units |
| Dimensions | 800mm × 813mm × 1200mm (1104mm incl. handle/ports) |
|---|---|
| Dry / Operating Weight | 200kg (440 lbs) / 430kg (946 lbs) |
| Supply / Return Port (Cart) | UQD08 |
| Accessory Connections | UQD04 & FD83 (8 of each) |
| Flushing Port | 1" Sanitary Tri-Clamp |
| Suitable Fluids | PG25 / DI-water |
| Input Voltage | 90–264VAC, 50/60Hz |
|---|---|
| Power Consumption | 1.5 kW |
| al DC Output | 48VDC / 1.5kW |
| Noise Level | <70 dBA |
Need more capacity? Get in touch with a sales engineer →
Save Time With Simultaneous Refills
Phased deployment shouldn't mean repeating the same task rack after rack. Scale the fill process to match the deployment, connecting to multiple CDU units simultaneously instead of servicing each one individually.
8-Unit Simultaneous Fill - Connect and charge multiple CDUs in one pass instead of filling each individually.
≥60 LPM Total Flow - Move enough volume to make multi-unit filling practical, not just technically possible.
Reusable Across Zones - Move the same cart between deployment areas as more racks come online.
Start Clean, Stay Clean
Take greater control over coolant quality during commissioning and maintenance with integrated filtration, pressure monitoring, and a visible fluid supply.
25 μm Dual-Path Filtration — Filters both fill and return paths to remove particulates during filling and flushing.
On-Board Pressure Monitoring — Provides visibility into pressure during coolant service.
200 L Visible-Level Tank — Makes coolant level easy to monitor throughout the service process.
Bring Service Where It’s Needed
Move commissioning and maintenance directly to the equipment with a self-contained rolling platform designed for servicing liquid-cooled infrastructure throughout the data hall.
Mobile Rolling Cabinet - Moves between racks and CDUs wherever commissioning or maintenance is required.
Self-Contained Design - Combines tank, pumps, filtration, and monitoring within a single service platform.
Wide-Range Power Input - 90–264 VAC, 50/60 Hz input provides electrical flexibility across deployment environments.
Questions, answered.
A coolant refill cart fills, flushes, and tops up the liquid-cooling loops of AI racks and CDUs, circulating coolant through filtration to remove particulates during initial deployment and ongoing maintenance.