Contact: AIRSYS North America Phone: (855) 874-5380 Page 12 of 112
Email: ASNSupport@air-sys.com Web: http://airsysnorthamerica.com Rev 1.15
Free Cooling System
When the operating conditions for free cooling are met, the control system switches the air damper to the
free cooling position. Cooler air from outside is delivered to the shelter by the supply air fan. At the same
time, hot air in the shelter is discharged to the outdoor environment.
Adaptive Free Cooling
Traditional Wall Packaged Unit control provides a fixed outdoor temperature where free cooling starts
based on indoor setpoint. With adaptive free cooling, the system will automatically learn and remember
the optimal temperatures where free cooling can take over. Adaptive free cooling will continuously
optimize toward free cooling hours with no human adjustment required. This is particularly valuable
whenever the site heat load changes as the system will also adapt to find the new optimal free cooling
setpoints.
Mechanical Cooling System
When the operating conditions for mechanical cooling are met, the control system switches the air
damper to the mechanical cooling position. The compressor compresses the refrigerant gas and sends it
to the condenser. The condenser is a heat exchanger, removing heat from the hot compressed gas and
allowing it to condense into a liquid. The liquid refrigerant is then routed to the thermal expansion valve,
which acts as a restriction device by forcing the refrigerant to go through a small hole. This causes the
pressure to drop. Then the liquid refrigerant is routed to the evaporator. The evaporator is also a heat
exchanger, absorbing heat from the indoor hot air causing the liquid refrigerant to change back into gas.
The refrigerant gas is then routed back to the compressor to complete the cycle. The refrigerant is used
repeatedly, absorbing heat from the indoor environment and discharging heat to the outdoor
environment.
Soft Start
When mechanical cooling is requested, the compressor will ramp up its capacity and continuously
modulate it to match the required site load. This minimizes mechanical stress upon startup, eliminates
startup voltage spikes, and reduces unit noise level.
The Control System (ASMUC.6 Controller)
By default, the ASMUC.6 controller can control up to 6 AIRSYS Precision Cooling WPUs (16 with expansion
module) organized in up to 4 zones. The setpoint for each zone can be adjusted independently.
The controller box is factory programmed with standard industry setpoints but can be configured on-site
or remotely to meet specific needs. Settings are retained in the event of a power loss. In addition, all
WPUs have integrated control modules that are the same as those in the controller box. If communication
between the units and controller is lost, the units will cool independently using the last given controller
settings and information from onboard temperature and humidity sensors.
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