Computer room air handlers
CRAH
downflow and upflow.
Chilled-water air handlers for the data hall, in a downflow configuration for raised floors and an upflow configuration for slab floors and overhead supply.
- Downflow
- 125 and 400 kW classes
- Fans
- EC, airfoil
- Controls
- BACnet IP
Configurations
Downflow or upflow.
Downflow CRAH
Takes return air in at the top and discharges down into the raised-floor plenum. A vertical arrangement that keeps the footprint on the gallery floor small.
- ◆Raised-floor data halls with under-floor supply
- ◆EC fans on a pull-out fan track for removal
- ◆Optional variable-height plenum
Upflow CRAH
Top-discharge configuration for overhead ducts or open-ceiling supply. Suits slab-floor data halls where there is no plenum below.
- ◆Slab-floor halls, overhead duct or open ceiling
- ◆Variable-speed EC fans
- ◆Same casing, coil and controls platform as the downflow line
Downflow performance
125 and 400 kW
classes.
Two downflow frames. Each is rated below at a hot-aisle return: gross total coil capacity at the conditions shown.
QXV045C
125 kW class · rated 146.4 kW gross
| Airflow | 20,000 CFM |
|---|---|
| Entering air | 98.0 °F DB / 73.0 °F WB |
| Chilled water | 70 °F in / 84 °F out, 71.4 gpm |
| Net of fan heat | 141.2 kW |
| Fans | 3 x EC airfoil, N-1 at 100% airflow |
| H x W x L | 95 x 125.2 x 48.9 in |
| Shipping weight | 4,805 lb |
| Electrical | 480 V / 3 ph / 60 Hz |
QXV110C
400 kW class · rated 445.2 kW gross
| Airflow | 60,075 CFM |
|---|---|
| Entering air | 102.0 °F DB / 71.5 °F WB |
| Chilled water | 70 °F in / 84 °F out, 216.8 gpm |
| Net of fan heat | 422.7 kW |
| Fans | 5 x EC airfoil, N-1 at 100% airflow |
| H x W x L | 192 x 155.8 x 78.1 in, incl. 78 in filter plenum |
| Shipping weight | 6,526 lb |
| Electrical | 480 V / 3 ph / 60 Hz |
Both at 0.20 in external static, 1,030 ft site altitude.
Standard features
Standard features.
Included in the base unit.
Automatic transfer switch
Dual interlocked contactors and dual through-the-door fused disconnects.
Control power ride-through
UPS or power buffer keeps the controls alive through a transfer.
EC fans with airflow feedback
Per-fan airflow reported through the EC fan electronics.
Leak detection + condensate
Rope leak detection and a dual-float condensate pump.
Smoke shutdown
Return-air smoke detector with fan shutdown.
Chilled-water valve
Two-way modulating chilled-water valve.
Construction
Construction.
| Casing | 18 ga G90 galvanized outer panel, black powder coat; 24 ga galvanized liner |
|---|---|
| Insulation | 2 in R-8 fiberglass |
| Base | Formed-channel base |
| Coil | Copper tube, aluminum fin, copper header, galvanized casing |
| Fans | Airfoil EC fans, axial discharge |
| Electrical | 480 V / 3 ph / 60 Hz, dual fused disconnects, ATS |
| Controller | 10 in touch-screen controller, stand-alone or networked |
Controls
BACnet IP standard.
Modbus by gateway.
BACnet IP by default. A Modbus gateway joins the unit to a Modbus network, with a published point map.
BACnet IP
Default
Modbus
Via gateway
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