22 TGZ 040A through TGZ 190A OMM TGZ-1
Automatic Pumpdown
TGZ units are equipped with single pumpdown control. When the last compressor running
on either circuit is ready to shut off, the liquid line solenoid valve (LLSV) is closed first
and the compressor continues to run until the pumpdown pressure is reached, at which time
the compressor shuts off. The shut off pressure is set at 15 psi below the Low Evaporator
pressure Unload setpoint.
When the first compressor on a circuit starts, the LLSV opens simultaneously.
Manual Pumpdown
When the Pumpdown Switch is in the pumpdown position, all compressors except #1 and
#2 will shut off. Then the Liquid Line and Hot Gas Bypass Valves will close. The
operating compressor will pump out the refrigerant. When the Suction Pressure is at 40
psig, the compressors will stop.
Evaporator and Condenser Water Pumps
Most TGZ Templifier unit applications are not arranged to controll the pumps from the
TGZ MicroTech II control system. But if desired, the chiller MicroTech II controller can be
programmed to start and stop the system evaporator and condenser water pumps. They may
also be controlled by the BAS or manually . Programming directions and the sequence of
operation can be found beginning on page 42.
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