STULZ CyberRow Chilled Water Series Installation, Operation & Maintenance Manual
(
Dec.
, 2013)
4.6.2.7
Service>Options>Group Menu Screens
Accessed in the Service menu, the Service>Options>Group Setup screens only appear if two or more units are wired
together as a work group.
4.6.2.7.1 Group Setup
Group Setup
Unit
ACTIVE
Number of Days
00
Hour of Day
00
Unit 1 of 2
Lead: 1
The Service>Options>Group Setup screen allows you to
select the work group duty assignment for the A/C unit.
The duty must be assigned for each grouped A/C unit at its
local display terminal.
Enter the number of days between rotating active units.
Enter the hour of day for unit rotation to occur.
The screen also displays a status message indicating which
A/C unit you are accessing and which unit is currently the
lead unit in the group.
4.6.2.7.2 Capacity Assist
Capacity Assist
Assist Time
300s
Cooling Cut in
1.0°
F
Cut out
0.0°
F
The fi rst Service>Options>Capacity Assist screen allows you
to enter the delay period for the unit to begin operating if
it is in the capacity assist mode. Also, each A/C unit in the
group may be assigned local cut-in and cut-out set points
for it's capacity assist operation. The values entered are
offsets which are applied to the control set points.
Each unit in the group should be assigned incrementally
increasing/decreasing offsets for cooling, humidifying and
dehumidifying so they will turn on one at a time only if the
unit(s) currently operating are unable to satisfy the demand.
4.6.2.7.3 Capacity Assist #2
Capacity Assist
Humid Cut in
-4.0%
Cut out
0.0%
Dehum Cut in
4.0%
Cut out
0.0%
The second Service>Options>Capacity Assist screen allows
you to adjust local capacity assist humidifi cation and
dehumidifi cation set points.
4.6.2.7.4 Group Sensors
Group Sensors
Use lead sensor, avg,
min, or max of group
Temp/Hum:
Local
The lead controller polls the controllers from all the A/C
units in the work group and calculates the averaged value
of their temperature sensors and humidity sensors. It also
determines the minimum (lowest) temperature sensor value
and the lowest humidity sensor value in the A/C group and
conversely, determines the maximum (highest) temperature
sensor value and maximum humidity sensor value in the
A/C group.
The Service>Options>Group Sensors screen allows you to
select whether to control the A/C work group using the T/H
sensors connected to individual A/C units (Local) or control
the work group using network sensor values transmitted
from the lead controller. You may select the network sensor
values to be the Lead, Average, Min or Max values. The
selections made in this screen will affect all the controllers
in the work group no matter which controller you access
the screen from.
4.6.2.7.5 Group Averaging
Group Averaging
Use unit sensors when
in Standby or Assist
For Group Averaging
Temp/Hum Sensors
Yes
Static Pr Sensors
Yes
Enter Yes for the unit to respond to it's local sensors for
Standby or Capacity Assist operation. Enter No for unit to
respond to the Group sensors.
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