STULZ E
2
SERIES CONTROLLER FOR PERIMETER SYSTEMS OPERATION MANUAL
50
DP and Humidify DP as displayed on the next two screens.
The two dewpoint values are initially the same as those
determined by the temperature and humidity offsets, but can
be expanded as discussed below and shown in Figure 11.
The actual economizer values are changed on the two screens
that follow (press the Down
arrow key).
6.3.2 Economizer Screen Two
Economizer
Expand dewpoint? Yes
Econ High Temp: 80.0°F
Dehumidify DP: 52.3
Econ High +DP: 3.0
Econ High -DP: -3.0
The second Service>Options>Economizer screen allows the
operator to change the economizer high temperature value and
expand the dewpoint boundaries. The Econ High +DP and
Econ High –DP are offsets from the dewpoint value that
passes through the temperature and humidity setpoint.
6.3.3 Economizer Screen Three
Economizer
Econ Low Temp: 30.0°F
Humidify DP: 46.4
Econ Low +DP: 3.0
Econ Low -DP: -3.0
The third Service>Options>Economizer screen allows the
operator to change the economizer high temperature value
and expand the dewpoint boundaries. The Econ Low +DP
and Econ Low –DP are offsets from the dewpoint value that
passes through the temperature and humidity setpoint.
7.0 COMMUNICATION WITH THE
CONTROLLER
It is possible for the STULZ E
2
controller to communicate in
multiple ways. The controller may be set up to utilize a pLAN
network to link with additional E² controllers to create a work
group consisting of multiple A/C units (see Figure 12 and
Section 7.1).
Using a BMS interface port, the controller may also be
connected to a BMS for monitoring and control of data points
using a multitude of different serial communication protocols
(see Section 7.3).
Up to 8 E² Series
Controllers in
Work Group
A/C Unit #2
Control Variables
From
BMS
Lead
Controller-
A/C Unit #1
Temperature Sensor*
Humidity Sensor*
A/C Units
#3 - #8
pLAN
Connection
* Proportional Input
Signals From Sensors or
BMS Analog Output.
Temperature Sensor*
Humidity Sensor*
Temperature Sensor*
Humidity Sensor*
7.1 Work Groups
The controller may be networked with a group of A/C unit
controllers via an RS485 connection to manage their outputs
as a system in an N+M (M = number of standby units) group.
The controllers from up to seven additional A/C units may be
tied to a Lead controller. The number of units to be assigned as
Active, Capacity Assist or Standby duty is to confi gured by the
factory however, they may confi gured in the fi eld (see Section
7.2.6) with assistance from STULZ Product Support. A unit
may also be designated as "Out of Service" (see Section 7.1.4).
Figure 12. Confi guring Multiple A/C Units
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