MK/MV – Medium Profile Series Unit Coolers (E206993_M)
32
9
UNITS WITH KE2 EVAP OEM CONTROLLER
KE2 Evap OEM controller reduces the energy used by the evaporator coil in refrigeration systems
through precise control of superheat, fan management, and demand defrost.
9.1
SEQUENCE OF OPERATION
1.
KE2 Evap OEM creates the evaporator profile when powered up initially. The controller completes a
sequence of operational tests of the system (brings the space down to temperature, defrosts the
coil, and repeats) to identify a temperature relationship between the coil temperature and space
temperature.
2.
Once the controller has established the most efficient method of controlling the evaporator, it uses
advanced fan control algorithms to maximize the energy efficiency of the coil.
3.
During normal operation, the refrigeration cycle pulls the coil down to temperature and continues
running until the space temperature is satisfied.
4.
When the space temperature is achieved, the controller closes the liquid line solenoid valve and
turns off the fans. The system continues to run until any liquid refrigerant is pumped out of the coil.
5.
During the refrigeration –off cycle, the fans will periodically cycle, based on the Fan ON/OFF Temps
shown in Figure 20. In the process of returning additional cooling capacity to the space:
a.
Frost is reduced naturally through the process of sublimation, which returns valuable moisture
to the space.
b.
The time between compressor runtimes is extended, saving.
Figure 20 LATENT ENERGY RECOVERY
