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CVHE-SVU01E-EN
22
General
Information
it is then compressed and
discharged to the condenser. Most of
the condensed refrigerant initially
follows the path of least resistance by
flowing into the storage tank. This
tank is vented to the economizer
sump through a small bleed line;
when the storage tank is full, liquid
refrigerant must flow through the
bleed line restriction. Because the
pressure drop through the bleed line
is greater than that of the orifice flow
control device, the liquid refrigerant
flows normally from the condenser
through the orifice system and into
the economizer.
Free Cooling FRCL
To enable Free Cooling Mode:
1. Free Cooling must first be installed
and commissioned.
2. Enable the Free Cooling mode in
the DynaView
™
Settings Menu
3. Press “AUTO”, and if used, close
the external binary input switch
(connected to 1A20 J2- 1 to 2) while
the chiller is in “AUTO”.
Free Cooling cannot be entered if the
chiller is in “STOP”.
If the chiller is in “AUTO” and not
running, the condenser water pump
will start. After condenser water flow
is proven, Relay Module 1A11 will
energize operating the Free Cooling
Valves 4B12 and 4B13. The Free
Cooling Valves End Switches must
open within 3 minutes, or an MMR
diagnostic will be generated. Once
the Free Cooling Valves End
Switches open, the unit is in the Free
Cooling mode. If the chiller is in
“AUTO” and running powered
cooling, the chiller will do a friendly
shut down first, (Run: Unload, Post
Lube, and drive vanes closed). After
the vanes have been overdriven,
closed and condenser water proven,
the Free Cooling relays will be
energized. To disable Free Cooling
and return to Powered Cooling, either
disable the Free Cooling Mode in the
DynaView
™
settings menu if used to
enable Free Cooling or “OPEN” the
external binary input switch to the
1A20 Module if it was used to enable
Free Cooling. Once Free Cooling is
disabled, the Free Cooling relays
Relay Module 1A11 will de-energize
allowing the Free Cooling valves to
close. The Free Cooling valves end
switches must close within 3
minutes or an MMR diagnostic is
generated. Once the end switches
close the chiller will return to
“AUTO” and powered cooling will
resume if there is a call for cooling
based on the differential to start.
Note: The manual control of the inlet
guide vanes is disabled while in the
Free Cooling Mode and the
compressor is prevented from
starting by the control logic.
Note: The relay at 1A11-J-2-4 to 6 is a
FC auxiliary relay and can be used as
required.