Stulz E2 Series User Manual

STULZ E
2
SERIES CONTROLLER FOR PERIMETER SYSTEMS OPERATION MANUAL
51
The Main screen of each unit in the work group indicates that
unit's duty assignment in the bottom fi eld. If the controller is the
group Lead, it is indicated in the bottom fi eld also.
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Unit On
ACTIVE Lead
Multiple Unit Display Screen
One controller may be designated as the work group lead and
networked with the controllers from a series of up to 7 additional
A/C units. If confi gured for multi-unit operation, the work group
lead controller display panel allows access to the same data and
group control sensor choices that are available from networked
system controller display panels.
The controller for each A/C unit in a group may be manually
called up from the Main display of the Lead unit via the PLAN
network. From the Main display, simultaneously press the Up
( ) and Down ( ) arrow keys. This allows the Main display to
access the controller in the adjacent A/C units in the group.
From the Main screen, press the Up ( ) arrow key to view the
Software Version/Date display screen to verify the accessed
shadow unit's PLAN address appearing in the upper left corner
of the screen.
From there, scroll through the menu screens as described in
Section 3.4. Each time the Up ( ) and Down ( ) arrow keys
are simultaneously pressed it sequences the display to the next
grouped unit's controller. Again, access this screen to verify the
PLAN address of the unit that has been interfaced with.
7.1.1 Capacity Assist
The Capacity Assist option can be used to maximize effi ciency
for conservation of energy and to more precisely control
capacity at low demand. This feature enables Active A/C units
to handle the demand up to a certain temperature/humidity
setpoint and then enables additional units to begin operating as
needed. If the Active A/C units are running and unable to satisfy
the demand, Capacity Assist A/C unit(s) may be programmed
to turn on to assist the Active units.
Each Capacity Assist unit may set to control operation based
on its local temperature/humidity sensor values or control
operation based on network sensor values transmitted from the
Lead controller. Multiple capacity assist units are typically set
with each unit in the group assigned incrementally increasing/
decreasing offsets for cooling, heating, 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. They
should incrementally turn off as each unit reaches its cut-out
setpoint, while active A/C unit(s) continue to maintain room
conditions at the desired level.
7.1.2 Standby
If the lead controller in the work group loses a signal
acknowledgement from an active A/C unit in the group, that
A/C unit is deemed as failed or taken out of service. The failed
unit will be replaced with the fi rst available standby unit from
the work group. The standby unit is cycled on and designated
as the new active unit in place of the failed unit.
7.1.3 Unit Rotation
In this mode, the Lead controller will rotate duty between the
grouped A/C units to promote equal run time and will rotate
the role of group lead. When set-up for unit rotation, the A/C
units will rotate duty in order of their group addresses. Active,
Capacity Assist and Standby units are all in the rotation cycle so
even a standby unit will be cycled into active duty on a scheduled
basis. The rotation time period is typically 1 week, however it
may be set by the user via the Factory menu. Call STULZ Product
Support for assistance when accessing the Factory menu.
7.1.3.1 No Rotation
A/C units in the group may have their duty assignments locked
so they do not join the rotation cycle (capacity assist and standby
no-rotation units cannot take the lead). In this case the message
No_Rot appears after the duty assignment displayed in the
main screen.
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Unit On
ACTIVE_No_Rot
An Active_No_Rot unit is always On. It will never be capacity
assist or standby. An Active_No_Rot unit may take the role as
lead controller when the rotation puts it as the fi rst active unit.
Units designated as "Out of Service" do not rotate nor can the
controller take the role of lead.
7.1.4 Out of Service
A unit may be removed from the group entirely by placing it Out
of Service. In this mode, the unit will not operate. A unit may
be placed in this mode as a safety measure to prevent it from
unexpectedly starting when performing maintenance or repairs.

Stulz E2 Series Specifications

General

Brand	Stulz
Model	E2 Series
Category	Controller
Language	English