Installation manual

EcoBreeze System Operation and Maintenance4
Air-to-air heat exchange
The Module outdoor fan is used to move the ambient air, used as the cooling medium, across
the air-to-air heat exchanger and condenser coil. The fan is controlled through a Modbus
interface with the Module controller.
• When the ambient air temperature drops below 4.4°C (40°F), the system water is
dumped to prevent freezing or dumped after 24 hours (user adjustable setting) of spray
free operation.
• Only fans are required to move the air.
• Cool air passes over the outside of the heat exchanger channels, cooling the hot IT air
flowing inside the heat exchange channels.
Indirect evaporative cooling (IEC)
The spray apparatus wets the outer surface of the heat exchanger and cools it to the wet-bulb
temperature of the outdoor air. The inner surface of the heat exchanger is a conduit through
which the air to be cooled is passed in thermal communication with the outer surface cooling
medium.
• Heat is removed from the IT air by evaporating water on the outside of the heat
exchanger channels.
• Water is supplied evenly over the heat exchanger channels via spray nozzles.
• Maintains the adjustable IT supply air setpoint.
Water Saver mode
The EcoBreeze control system offers a water saver mode. With the water saver set to On,
water system operation is suspended as soon as dry operation can facilitate the cooling
demand. This may be a significantly higher ambient air temperature than the normal 40°F
transition to dry. The consequence of this action will be a higher outdoor air fan speed with
corresponding greater energy consumption. In most cases the most economical mode of
operation will be the factory default with water saver set to Off.
Proportional DX cooling
During normal operating conditions the effectiveness of the IEC alone may not be adequate to
achieve the desired supply air temperature. During these periods, some Modules will have their
compressors activated to provide the needed additional cooling. The acting Frame master
controller calculates the quantity of compressors needed while allowing the compressor
capacity control to operate as closely to the midpoint as possible.
• Variable speed compressor combined with an electronic thermal expansion valve allows
for optimal efficiency
• Supplements evaporative cooling to maintain the supply air setpoint
• Designed for 60% of nominal full rated capacity
• Uses R410a refrigerant
• Micro-channel condenser coil coated for use in harsh environments