9
®
Packaged Rooftop Air Conditioner
Pr
oduct Guide Specifi
cations
CONTROLS
All functions of the air conditioner shall be controlled by
a factory installed STULZ
E²
Series controller. The control
program shall be specifi c to the air conditioner and include
user-adjustable setpoints and tuning. STULZ
E²
Controller
includes supply and return temp/RH sensors shipped loose.
E²
Series Controller Description
General
The advanced microprocessor based STULZ
E²
series
controller shall be equipped with fl exible software capable of
meeting the specifi c needs of the application. The setpoints
shall be default and their ranges shall be easily viewed and
adjusted from the user interface display. The program and
operating parameters shall be permanently stored on a non-
volatile system in the event of power failure.
The controller shall be designed to manage temperature and
relative humidity (RH) levels to a user defi ned setpoint via
control output signals to the DX system.
The controller shall receive inputs for measurable control
conditions (temperature, relative humidity, and dew point)
via return air or room mounted sensors. The internal logic
shall then determine if the conditions require cooling or
dehumidifi cation. Control setpoints shall be established to
maintain design conditions of the installation. The controller
shall respond accordingly to changes in these conditions and
control the output/demand for the appropriate mode of
operation until user defi ned conditions are achieved.
Field Confi gurable
The program for the STULZ
E²
series controller shall be fi eld
confi gurable, allowing the operator the capability of selecting
control setpoints specific to the application. Operator
interface for the STULZ
E²
Controller is provided via a user
interface display panel. The display panel shall have a backlit
LCD graphical display, and function keys, giving the user
complete control and monitoring capability of the precision
cooling system. The menu driven interface shall provide users
the ability to scroll through and enter various menu screens.
Password Protection
Access to the Info Menu, Alarms Log, and the ability to
monitor room conditions shall be allowed without the use of a
password. Modifi cations to the control setpoints shall require
the use of a password. The controller shall be programmed
to recognize predetermined security levels before allowing
access to display screens containing critical variables. Three
secured menu levels (Control, Service and Factory) shall
support unique passwords that must be entered to access
the menu screens so only authorized personnel may perform
modifi cations to the settings.
Restorable Parameters/Factory Defaults
Upon initial start-up, the air conditioning system shall operate
using the setpoints programmed by the factory. The customer
may enter new operating parameters in the control menu and
the system shall then operate accordingly. The new setpoints
may be stored as, "Customer Default Setpoints". The primary
setpoints entered by the factory still remain stored in the
controller's memory as "Factory Setpoints". The setpoints
for the system may be re-adjusted in the Control menu at
any time. If it becomes necessary, the customer may restore
the setpoints back to the Customer Default setpoint values
or to the original Factory (primary) setpoint values.
Alarms
Alarm conditions shall activate a red LED indicator that
backlights the alarm function key. As an option, an alarm
condition may also be enunciated by an audible alarm signal.
An alarm is acknowledged by pressing the alarm key. This
calls up alarm display screens that provide a text message
detailing the alarm conditions. After an alarm condition is
corrected, the alarm can be cleared by pressing the alarm key.
Small Bezel Display Panel
The small bezel user interface display panel features an easy
to read, backlit liquid-crystal alphanumeric display equipped
with contrast adjustment and LED illuminated function
keys. The screens that appear on the user interface display
panel present data that originates from the controller I/O
module. The controller is operated via a 6-key menu-driven
loop structure and offers an alarm log plus four different
interface menu levels to the operator: Information, Control,
Service, and Factory. These menus permit the user to easily
view, control, and confi gure operating parameters for the
air conditioning unit.
Air-Side Economizer (Optional)
The CyberPack system shall be equipped with a unique
air-side economizer for applications utilizing outdoor Air-
Side Economizing. The STULZ Air-Side Economizer package
shall include return air and outside air dampers, outdoor
temperature and humidity sensor, remote space return
air sensor, and supply air sensor for proper control during
economizer operation. Control settings shall be included for
both temperature and humidity properties of the outdoor air.
A damper signal lockout shall be included if the outdoor air
conditions reach user adjustable limits.
