Filter
Top Products
73
CVHE-SVU01E-EN
Low Refrigerant Temperature
Cutout
The purpose of the low evaporator
refrigerant temperature protection is
to prevent water in the evaporator
from freezing. When the Low
Evaporator Refrigerant Temperature
Cutout (LRTC) trip point is violated, a
latching diagnostic indicating the
condition is displayed. The Low
Evaporator Refrigerant Temperature
Diagnostic is active in both the
Running and Stopped modes.
The Low Evaporator Refrigerant
Cutout Setpoint is factory set to 36°F.
This can be altered via the service
tool. A Service Tool adjustable
setpoint that should be based on the
percentage of antifreeze used in the
customer’s water loop. The Service
tool will display a warning message
such as “Warning: Adequate
Antifreeze required” for any
Evaporator Refrigerant Temperature
Cutout below 28°F and any Leaving
Water Temperature Cutout below
35°F.
The percent of antifreeze required is a
function of the leaving water
temperature setpoint and the worse
case (lowest permitted water flow)
approach temperatures of the
chiller’s evaporator design.
Head Relief Relay
(See page 53 also)
Surge, condenser limit, and certain
conditions on ice mode will energize
the head relief relay. Note: There is a
TechView programmable head relief
relay filter times setpoint. The default
is one minute.
Machine Protection
and Adaptive
Control
High Evaporator Leaving
Water Temperature Cutout
(Main Processor Software Revision
6.0 and higher)
A High Evaporator Water
Temperature Diagnostic was
implemented that will turn off the
Evaporator Water pump relay if the
relay is being forced on due to a Loss
of Evaporator Water Flow Lost
diagnostic (MAR Diagnostic) and the
Evaporator Leaving Water
Temperature exceeds an adjustable
High Evaporator Water Temperature
Cutout for 15 continuous seconds.
The High Evaporator Water
Temperature diagnostic is an
immediate shutdown and is
nonlatching. The diagnostic will auto
reset and the pump will return to
normal control when the temperature
falls 5°F below the cutout setting.
High Evaporator Water Temperature
Cutout is a setpoint that is adjustable
in TechView from 80°F and 150°F. The
default is 105°F.