Stulz E2 Series User Manual

STULZ E
2
SERIES CONTROLLER FOR PERIMETER SYSTEMS OPERATION MANUAL
48
6.2 Economizer Service Menu Screens
The screens that follow allows economizer operation to be set
up and tested and set up. They are available in the Service menu
only if the economizer option is enabled by the factory.
Economizer Test
It is recommended to
test economizer values
before changing them.
Econ Test
6.2.1 Economizer Test
From the Service>Economizer Test screen, press the Enter (
) key to enter a sub-menu to perform a functionality test of
the economizer mode and experiment with different settings
of temperature and dewpoint. Press the Down ( ) arrow key to
advance the display to the Service>Economizer Option screen
where the economizer mode is actually enabled (see Section
6.3.1).
TEST Economizer
This section does not
actually control the
economizer. It is for
test purposes only.
Expand dewpoint? Yes
It is recommended to use the regular dewpoint settings fi rst
to familiarize oneself with the economizer operation. Using
the factory default settings, the dehumidifi cation dewpoint is
52.3 degrees, the humidifi cation dewpoint is 46.4 degrees,
and the dewpoint through the setpoints is 49.5 degrees. Figure
10 depicts the default economizer zone as bounded by the
rectangle A B C D.
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The factory default offsets may be adjusted to expand the
operating zone as represented by A
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B
1
C
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D
1
.
The TEST Limits screen is used to adjust the high and low
temperature and if enabled, modify the four dewpoint offsets.
The starting dewpoint offset values shown are drawn from the
default ones of +2.8 (49.5 + 2.8 = 52.3) and two arbitrary ones
(-3.3 and -5). The offset values do not need to match nor does
the resultant shape have to be a rectangle.
TEST Limits
Econ High Temp: 80°F
Econ High +DP: 2.8
Econ High -DP: -5.0
Econ Low Temp: 30°F
Econ Low +DP: 2.8
Econ Low -DP: -3.3
6.1 Economizer Information Menu Screens
The following display screens are available in the Information menu (Section 5.2) only if the unit is equipped for economizer
operation by the factory. The screens display key operating parameters for the economizer mode.
Econ Return Sensor
00.0°F
00%rh
econ return DP 00.0°F
Press ( ) or ( ) Key
6.1.1 Economizer Return Air Sensor
If the controller is confi gured for economizer operation, a display screen indicates
the temperature and relative humidity as measured by the return air temperature
and RH sensor inputs. The return dewpoint is calculated by the controller based on
the return air temperature/humidity sensor inputs.
Econ Return Sensor
00.0°F
00%rh
econ return DP 00.0°F
Press ( ) or ( ) Key
6.1.2 Economizer Outside Air Sensor
This screen indicates the temperature and relative humidity as measured by the
outside air temperature/humidity sensor. The display also indicates the degree to
which the outside air damper is opened as a percentage. The outside air dewpoint
is calculated by the controller based on the Outside Air temperature/humidity
sensor inputs.
Figure 10. Default Economizer Zone

Stulz E2 Series Specifications

General

Brand	Stulz
Model	E2 Series
Category	Controller
Language	English