The P29 control combines a
pressure sensing mechanism
with a time delay. A drop in
pressure energizes the time
delay relay and opens a contact
after a predetermined period.
There are two principal
applications for this control:
1. Chiller, Low Temperature
Pressure element is
connected to the suction
side of a chiller refrigeration
system and the time delay
relay is wired to the
compressor control circuit.
Prolonged low suction
pressure, such as pressure
caused by a low
temperature condition, will
cause the control to shut
down the refrigeration
compressor.
2. Industrial Equipment,
Lubrication Oil Pressure
On any electrically driven
machine with a forced oil
system, the pressure
element is connected to the
lube oil system and the time
delay relay is wired in the
control circuit. The control
time delay allows oil
pressure to build up to
normal on start-up or
recover from temporary
fluctuations. A sustained
loss of oil pressure will
cause the control to shut
down the machine.
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