ECU-550

Environmental Control Unit

Vapor Compression Cooling   for Electronics Enclosures
Application
ECU-550 is an extremely small, lightweight, ruggedized
air conditioning system for cooling electronics. ECU-550
maintains air temperatures at or below ambient temperatures, enabling Commercial-Off-The-Shelf (COTS)
electronics to be safely used in extreme environments.  
The system has been fully ruggedized for military use toMIL-STD-810, MIL-STD-1275, and MIL-STD-461.
Weighing less than 20 pounds, the ECU-550 willcontinuously maintain a temperature of ≤125°F (51.6°C)
within the enclosure in a 125°F ambient environment
while absorbing 550 Watts of heat.   The electronics
remain sealed against all environmental contamination,improving reliability.

Features and Benefits
ECU- 550 Environmental Control Units use vapor compression air conditioning technology to cool electronics below
ambient temperature.
• 550 Watts of cooling at rated conditions• 300 Watts of heating• Dehumidifies enclosure• MIL – Qualified*• Sealed case keeps electronics clean and dry• Field Proven – Qualified and Shipping•   Used on ground vehicles•   Used on operational transit cases• SWAP effective vs. thermoelectric systems•   3 times smaller    •   4 times more efficient    •   5 times lighter• NSN# 4120-01-590-1647 Environmental Control

www.aspensystems.com

Description
The ECU-550 is an efficient vapor compression refrigeration
system using Aspen’s miniature rotary compressor. TheECU-550 circulates the enclosure air, heating or coolingas required to maintain setpoint temperatures. The ECU550 manages the temperature in electronics transit
cases, for legacy systems, or designed into new custom
enclosures. The major transit case manufacturers have acooling collar mount for the ECU-550.

nAspedeinsi
World’s Smallest Rotary Compressor

Aspen Systems is an ISO 9001:2015 registered company.

ECU-550

FP00027

Technical Data (FP00027)
Cooling Capacity550 Watts

At rated operating conditions**

Heating Capacity

300 Watts (Resistive)

At 40°F (4.4°C) or below

Operating Ambient
Temperature Range-40°F to 140°F(-40°C to 60°C)

At Tambient < 125°F (51.6°C),
capacity is > 550 Watts

Storage-40°F to 160°F(-40°C to 71°C)

Maximum Power Draw

525 Watts (at 32 VDC)
420 Watts (at 28 VDC)

Voltage

22 - 32 VDCMaximum Current

16.4 Amps (at 32 VDC)
15.0 Amps (at 28 VDC)

Altitude15,000 ft. (4.6 km)

Humidity Control

70% RH between 50°F
and 140°F

See manual for condensate
drain instructions

Orientation± 15°

On any axis from vertical

Military Standards

MIL-STD 810*
MIL-STD-461
MIL-STD-1275

Environmental
EMI Protection
Power Supply

Weight20 lb (9.1 kg)

Dimensions

HxWxD
9.0 x 18.5 x 6.7 in.
22.8 x 47.0 x 17.0 cm

Airflow Schematic

ECU-550 Mounted in anElectronics Enclosure
ECU-550

Actual power draw varies with
operating condition• Sealed enclosure protects
electronics within the case
• ECU-550 does not allow mixingof inside and outside air* When installed in a qualified military transit case**Rated Conditions: 125°F ambient, 125°F return air within enclosure

Cooling Capacity Performance Map

Cooling Capacity (Watts)

900
800

100°F Ambient

700

140°F Ambient

Expected Performance
ECU-550 is a ruggedized air conditioning systemfor cooling electronics in sealed electronics
enclosures and mobile applications. The ECU
has been rigorously tested and qualified tomilitary standards including 810, 461, and1275 when installed in a qualified enclosure.
The effectiveness of this system, however, isdependent upon other factors.   These factors
include adequate clearance for ambient
air supply on the outside of the system,and sufficient airflow inside the enclosure
passing over the heat generating electronics.

120°F Ambient

600x500
400300
Rated Operating Condition
125°F Ambient, 125°F Case,
550 W Capacity

20010007080

90100110120130140

Case Internal Temperature (°F)

www.aspensystems.com       24 St. Martin Drive • Marlborough, MA 01752 • 508 281 5322  • info@aspensystems.comContact information:
info@aspensystems.com
website: www.aspensystems.com