Rev.01 03-27-17
Page 15 of 71
Compu-Aire
The Energy Miser System shall be provided with a Two (2) way water regulating valve for
condenser coil, a Two (2) way modulating chilled water valve for energy miser coil, DX coil(s),
compressor(s) and co-axial water condenser(s). The water valves on water cooled condensers and
free cooling energy miser CW Valves will allow the water flow in either condenser coil or free
cooling EM coil. The two way control valve shall control the amount of flow to auxiliary energy
miser cooling coils to meet the demand when in EM cooling mode. The Two way water regulating
valve will control the amount of water flow in condenser based on the refrigerant pressure in DX
cooling mode. System shall be programmed to do either DX cooling or EM cooling based on
entering water temperature.
Energy Miser systems are connected to Cooling Tower or Dry Fluid Coolers to obtain re-circulating
water or water glycol solution. In addition, the system is equipped with steam generating
humidifier, electric reheat and microprocessor based controller.
A unique feature of Energy Miser system is that the free cooling water coil is located just before
the direct expansion coil and is properly sized to provide the same cooling capacity as the DX
system at 45 deg. F. entering water temperature. The indoor unit will send a signal to enable and
disable the outdoor auxiliary equipment. The outdoor equipment has its own control logic to
provide water temperature suitable for either EM mode or DX cooling mode.
Cooling-Direct Expansion
Direct Expansion Cooling shall operate when the water temperature increases above the specified
EM setpoint. A digital signal is sent to the system by microprocessor to signal the compressors
and the two (2) way valves will regulate the water flow into the water cooled condensers based
on the refrigerant pressure. Each compressor system shall have separate 2-Way water regulating
valves. The Energy miser mode depends on the entering water temperature and it is adjustable.
Cooling-Energy Miser Mode
The unit can switch over from DX cooling mode to free cooling Energy Miser mode based on the
Entering Water temperature.
Unit shall start in DX cooling mode. If the temperature of water supply drops below the setpoint
for the Energy Miser mode, the unit will switch over to the Energy Miser free cooling mode. The
outdoor fluid cooler shall be provided with Energy Miser control panel to maintain lower fluid
temperature during Energy Miser mode.
In the free cooling Energy Miser mode, the compressors will remain shut off while the fans of the
unit shall be on. Humidification and Dehumidification modes shall operate as needed.
3.7
Water Cooled Energy Miser
Summary of Equipment
