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the Supervisory Array Controller and will
maintain a “manual mode” default chilled
leaving water temperature set point.
N+1 logic can be utilized with the Supervisory
Array Controller when each chiller in an array
is equipped with optional chilled water
motorized on-off valve, optional condenser
water regulating valve and a standby chiller is
installed in the array.
Figure 22 - Supervisor Controller Layout
Master-Secondary Array Controller
This option allows up to six (6) FWCD Series
chillers to be controlled and operated. The
Master-Secondary Array Controller requires
only a single controller for the array. This
option is beneficial in replacement applications
where a single larger chiller, with one
controller, is replaced by modular chillers
controlled with one controller. The Master-
Secondary Array Controller is also applicable
for chiller applications that do not require
redundant operation and first cost is considered
an important factor.
The Master-Secondary Array Controller is
powered from the unit supply power and
factory provided transformer. The Master-
Secondary array control panel also contains a
field connection terminal strip and door-
mounted off/auto switch, run indicator light
and alarm indicator light.
The Master-Secondary Array Controller is
accessed through the keypad display,
touchscreen display or PC/laptop. If
communication between the individual FWCD
Series chiller modules and the Master-
Secondary Array Controller is lost, that
module will be inoperable until
communication to the module is restored. The
Master-Secondary Controller will continue to
control the other modules in the array. If
Master-Secondary Array Controller fails, the
array will be down until the controller is
repaired or replaced.
N+1 logic can be utilized with the Master-
Secondary Array Controller, via the demand
limit function, when each chiller in an array is
equipped with optional chilled water
motorized on-off valve, optional condenser
water regulating valve and a standby chiller is
installed in the array.
Figure 23 - Master-Secondary Controller Layout
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General