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located adjacent to the transformer inside the
control box.
External Contacts and Peripherals
The following peripheral control features and
program logic come standard on all FWCD
compact chillers. Designated terminals on the field
connection terminal strip in the control panel are
provided for field connection of each. Consult the
field wiring diagram and wiring schematic
diagram provided in this manual for the
connection points. The wiring schematic diagram
is also attached to the inside of the control panel
door.
Required Chilled Water Flow Switch
Unexpected Chiller Start!
Failure to follow instructions could cause the
chiller to start unexpectedly which could
result in equipment or property damage. An
external source (EMS, time clock or any
other means) should not be allowed to bring
on a pump that would trigger the flow switch
to start the chiller. The flow switch is meant
to act as a safety switch and not a start/stop
mechanism.
The FWCD controller has a required input that
accepts a contact closure from a proof-of-flow
device such as a flow switch or other factory
approved flow proving device. When this input
does not prove flow within a fixed time relative to
transition from enabled to run modes of the chiller,
or if the flow is lost while the chiller is in the
running mode of operation, the chiller will be
prohibited from running. The installer must
provide and install this flow proving device.
Failure to provide this flow proving device voids
unit warranty.
Condenser Water Loss of Flow Protection
The FWCD controller logic will sense a loss of
flow through the condenser. No condenser water
flow switches are necessary with the standard
standalone FWCD controller configuration.
Required Pump Control
FWCD units have one dry contact relay which is
required to start the chilled water pump. These
chillers also have one dry contact relay to start a
condenser pump. These features are standard but
only the chilled water pump control is required.
Remote Off/Auto
The FWCD controller has an input that accepts a
contact closure from a remote device such as a
toggle switch that can enable or disable the chiller
to run. It would be wired in series with the
Off/Auto switch located on the control panel door.
This feature is standard but not required.
Remote Alarm
FWCD units have one dry contact relay to
indicate with a remote light or bell or other device
that at least one compressor in the unit has been
locked out for whatever reason and needs
attention. This feature is standard but not
required.
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General