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Set minimum position potentiometer to twice the design load. For
example, if the space is designed for 30 people at 15 cfm/person, adjust
the minimum position potentiometer at the economizer logic to 900 cfm.
This will allow the economizer to introduce 450 cfm (1000 ppm CO
level) at the design load. The CO
Note:
For 24V, do not use a HVAC unit transformer. Provide
24 V by using a non-grounding transformer.
Johnson Controls M100E Economizer Actuator with R81EAA-2
Interface Board
Y45AA-9 Remote Minimum
Position Potentiometer
(1,000-10,000 ohm)
L2
L1
2
1
8
7
6
5
4
3
2
Input
Common
Common
Ventostat Mounting Bracket
Figure 8: Economizer Actuator and Interface Board -
Diagrams
Configuring the Sensor
The sensor has two different settings:
•
User Adjustable Sensor Settings
•
Factory Settings
User Adjustable Sensor Settings
The GE Telaire 8000 series includes features which are user adjustable.
These adjustments can be made using the keypad on display units, or by
the PC based UIP program that communicates to the sensor via a custom
RS232 interface cable.
Factory Settings
The default settings are the typical settings used by a building control
system.
If the installation requires changes to the sensor, the user can customize
certain characteristics of the sensor. For example, non-factory settings
may be applicable when the sensor is being connected to equipment that
has a fixed input range (e.g., actuators used with economizer systems).
Sensor Programming Features
Outlined below in Table 1 are the adjustable parameters of the sensor
and the factory setting. In addition to offering these adjustable features,
the programming interface allows for a fast and simple adjustment of
sensor calibration.
Telaire Ventostat™ 8000 Series
sensor should use "STDSET#1."
2
M100E
8
T2
T1
Open
9
10
A91 Mixed Air
Close
Thermistor
1
B
S2
S1
R
Table 1: 8000 Series Adjustment Parameters and
2
Adjustment
Altitude Above Sea
Level
ABC Logic™
Select Standard Setting
Customize Setting:
PPM Range
Output Range
L1
Proportional/
L2
Exponential Output
Relay Setpoint
Relay Hysteresis
T
All GE Telaire 8000 series products are calibrated at sea level. As
altitude increases, the accuracy of this sensor, as of all gas sensors,
introduces an error of approximately -3% of the reading per 1,000 ft of
elevation. Users that are in elevations significantly higher than sea level,
such as Denver, Colorado, should consider adjusting the altitude to have
the most accurate reading. The altitude setting can be adjusted on the
unit in 500 ft increments.
ABC Logic™ Self Calibration System
All GE Telaire 8000 series sensors are factory set with the ABC Logic
(Automatic Background Calibration) self calibration feature ON. This
feature allows the sensor to continually re-calibrate itself when the
indoor concentrations drop to outside levels while the building is
unoccupied. Generally a building must be regularly unoccupied for 4
hours or more for this self-calibration system to operate properly. Under
these conditions, the ABC Logic feature should maintain sensor
calibration over the lifetime of the sensor. The ABC Logic feature should
be turned OFF where a building is continuously occupied 24 hours per
day, or where there could be significant sources of non-occupant related
CO
such as greenhouses, breweries and other industrial and food
2
processing applications.
Pre-Programmed Settings
In addition to the factory setting for the 8000 series sensors, nine
standard settings can easily be selected using the keypad (display units
only) or the PC based UIP Program. Table 2 on the next page describes
each of the settings. The definitions for some of the terms used in the
table are described in more detail as part of the custom settings outline in
the "Custom Settings" section on the next page.
Settings 1, 2 and 3 are applicable for automated or computerized
building control systems.
Settings 4 to 7 are specifically designed for operation with economizer
controls and actuators where a 0-10 VDC signal will provide 0-100%
outside air modulation. These control settings provide different
modulation ranges, depending on the target cfm-per-person ventilation
rate desired. As described below, the exponential setting is best used in
applications that have large volumes of air and people, such as
auditoriums, gyms and large conference areas.
Setting 8 is for use in occupational health and safety applications where
users want to measure concentrations in relation to the 5000 ppm, 8 hour
exposure levels established by OSHA (Occupation Safety and Health
Administration).
Factory Settings
Range
Factory Setting
0 - 10,000 ft.
0 ft.
ON/OFF
ON
1 to 9
1
0 - 10,000
0-2,000
4-20 mA/ 0 - 10 V
4 - 20 mA/ 0-10 V
Select One
Proportional
0 - 10,000 PPM
1000 PPM
0 - 10,000 PPM
50 PPM
Page 3
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