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4-6 l Operation
Chiller Operation Sequence
The EarthSmart ECM Series Chiller has a unique user interface that controls the
process temperature and prevents refrigeration migration during compressor off
times.
When the main power is connected:
1 Depending on the state of the refrigeration system, the compressor may
turn on momentarily upon connecting power. The compressor will stop when
the refrigerant is pumped into the condenser and a low pressure condition exists
in the evaporator.
When the power toggle switch is turned to the “On”or “I” position:
2 Turning the toggle switch on immediately starts the process pump and
illuminates the control. When flow is established and the unit is not in a low
temperature alarm, the Liquid Line Solenoid valve (LLSV) will open. This
allows the refrigerant to migrate to the evaporator and increase the pressure.
When the low refrigerant pressure switch is satisfied the compressor will turn on
and process coolant will begin cooling.
3 When the process temperature is above setpoint the compressor will run
and the Hot-Gas Bypass valve (HGBP) will not open. If the process
temperature falls below the setpoint, the HGBP valve will energize, raising the
actual process temperature to maintain the user-entered setpoint temperature.
The HGBP valve can energize up to 9 out of 10 seconds. If there is less load
on the chiller and the temperature continues to fall to 4°F {2.2°C} below the
user-entered setpoint the controller will alarm (A2.lo) and close the LLSV. The
compressor will pump the refrigerant out of the evaporator and the low pressure
switch will shut off the compressor. This is a normal function of the chiller and
will not require troubleshooting.
4 The controller stays in this alarm condition (A2.lo) until the temperature is
2°F {1.1°C} above the user-entered setpoint, at which point the controller
allows the LLSV to re-open and the compressor to restart.
(continued)