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CVHE-SVU01E-EN
Condenser Limit
Condenser pressure is continuously
monitored to provide a limit function
that prevents High Pressure Cutout
(HPC) trips. This protection is called
Condenser Refrigerant Pressure
Limit, or High Pressure Limit. A fully
loaded compressor, operating at high
Evaporator Leaving Water
Temperature (ELWT) and high
condenser temperatures causes high
condenser pressures. The purpose of
this limit is to avoid High Pressure
Cutout (HPC) trips by allowing the
Chiller to continue to run at a lower
load instead of tripping off via HPC.
The Condenser Limit will be based
from a pressure conversion from the
Condenser Refrigerant Temperature
sensor, unless there is a Condenser
Refrigerant Pressure sensor installed
(CDRP option). If the Condenser
Refrigerant Pressure Sensor is
installed, then the limit will be based
from the Pressure sensor.
When limited by this action,
“Condenser Pressure Limit” will be
displayed as a sub-operating mode.
The Condenser Limit Setpoint is
factory set (93 percent of HPC),
however can be altered via the
service tool.
Machine Protection
and Adaptive
Control
Evaporator Variable Flow
Compensation
This option includes transducers for
the differential evaporator and
condenser water pressures (psid).
Flow switches or some other means
to prove flow are still required and
must be field connected.
The following data will be shown at
the DynaView and TechView displays
and at Tracer Summit.
• Evaporator and condenser
differential water pressures (psid)
• Evaporator and condenser gpm
• Evaporator tons
How It Works
The Tracer chiller controller uses a
patented, variable, water-flow
compensation algorithm to maintain
stable, precise capacity control.
Variable flow compensation is a new
optional control feature for CTV
chillers.
It will automatically adjust capacity
control to:
• Maintain control stability at low
flow.
• Reject variable-flow disturbance.
If the water-pressure transducer fails
and the flow switch continues to
prove flow, water-flow compensation
will be disabled and the design delta
T will be used.
For applications designed to operate
with variable-primary (VPF) water-
flow, variable flow compensation
allows the chiller to respond quickly
to accelerating or decelerating water.
By automatically adjusting the
control gain, large changes in the
water-flow rate can be tolerated.
For details, refer to CTV-PRC007-EN.