Installation and Operation Instructions ACI/CO2, ACI/CO2

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Installation and Operation Instructions
ACI/CO2, ACI/CO2-VDC, ACI/CO2-T
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READ THESE INSTRUCTIONS BEFORE YOU BEGIN INSTALLATION
nLOCATION
The ACI/CO2 transmitter is designed to mount over a standard single gang electrical or junction box approximately 4 to 6’
above the floor. Make sure that the transmitter is mounted at least 3 feet from any corner and 2 feet from an open
doorway. Do not mount the sensor close to a window, on an outside wall, next to any door that leads directly outside, or
over heat sources. Also, make sure that the sensors are not exposed to direct occupant breathing such as near vending
machines, water fountains, bubblers, or coffee machines.
nMOUNTING
Room Mount: First remove the mounting plate from the sensor and mount it to the wall or junction box using (2) 6/32 x
1” machine screws and/or drywall anchors. If the CO2 transmitter will be mounted to a drywall wall, use the mounting
plate as a template to mark both the mounting and wiring holes. Now securely mount the mounting plate to the wall or
junction box and make all of the necessary connections as shown in Figure #1. At this time the CO2 controller can be
mounted on the base by aligning the top clips and then securing to the bottom clips. A”snap” sound will indicate that the
sensor is secure and the unit will now have power. When powered, the LED on the front of the unit will blink for
approximately 6 seconds and then remain on. Please note that the ACI/CO2-T and the ACI/CO2-VDC don't have the
RED LED indicator that lights upon initial power up. The warm up time will last for approximately 2 minutes. Now
finish the installation by sliding the cover over the menu keys and secure with the supplied screw.
Duct Mount: The ACI/CO2 duct mount version should be mounted in the return air duct in a location where the CO2
sensor and the Pitot tube can be mounted as close together as possible. The duct should have a minimum flow rate of at
least 600 and no more than 4,000 FPM. Now remove the mounting plate from the sensor and mount it to the wall or
junction box using (2) 6/32 x 1” machine screws and/or drywall anchors. If the CO2 transmitter will be mounted to a
drywall wall, use the mounting plate as a template to mark both the mounting and wiring holes. Now securely mount the
mounting plate to the wall or junction box and make all of the necessary connections as shown in Figure #1. At this time
the CO2 controller can be mounted on the base by aligning the top clips and then securing to the bottom clips. A “snap”
sound will indicate that the sensor is secure and the unit will now have power. When powered, the LED on the front of
the unit will blink for approximately 6 seconds and then remain on. Please note that the ACI/CO2-T and the ACI/CO2VDC don't have the RED LED indicator that lights upon initial power up.The warm up time will last for approximately 2
minutes. Now finish the installation by sliding the cover over the menu keys and secure with the supplied screw.
Pitot Tube Installation: To mount the Pitot tube, drill (1) 7/8” hole through the duct. Now insert the Pitot tube and mark
the (2) remaining holes for the mounting screws and punch or drill the (2) marked holes. Re-insert the Pitot tube into the
duct making sure to note the direction of the airflow in the duct and the arrow direction on the Pitot tube itself. Now
secure the Pitot tube to the duct with sheet metal screws or rivets. Note: To ensure an airtight seal, assure the
mounting surface of the duct is clear of dirt or other obstructions.
Tubing Installation: On the top of the ACI/CO2 Duct sensors, unscrew the protective covers on the Pitot tube connectors.
Verify the length of the tubing before attaching to the sensor. The tubing should connect without any stretching or
pulling. If the length is long enough to create a loop or bind in the tubing, it should be shortened. To shorten the tubing,
remove the Pitot tube connectors and cut the tubing to length. Replace the Pitot tube connectors by using a twisting or
screwing motion. Verify that all of the connectors are secure. Note: If the tubing length has been shortened, be sure
the in-line filter is replaced on the Pitot tube connector marked with an “H”. Complete the installation by screwing
the tube connectors to the input ports on the sensor. Note that the input ports on the sensor are the same so the connectors
on the tubing can be attached to either input port, since it will not affect the overall performance of the sensor.
2305 Pleasant View Rd. Middleton Industrial Park Middleton, WI 53562
PH: (608) 831-2585 FAX: (608) 831-7407
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 Wiring Diagrams
ACI/CO2-R and ACI/CO2-D
2
1
8
7
6
5
4
3
2
1
AC- / Ground
0-10 VDC CO2 Output
Not Used
AC+ / DC+ Supply Voltage
Signal Ground
Not Used
Power Supply
18-36 VAC
18-42 VDC
4-20 mA CO2 Output
Relay N/O
Relay N/C
Relay Common
ACI/CO2-T
Therm
4-20mA GND 0-10V
+24 VDC
GND
COM
Setpoint output to controller
RJ1 2 C ommunication Jack
Pinout
*
POT P5
*Optional setpoint offset
resister may be installed
as shown
ACI/CO2-VDC
T.B. #4
COM
CCN+
CCN-
1
T.B. #6
6
T.B. #5
Vout GND Vin
Output
0-10VDC CO2
18 to 30 VAC RMS supply Voltage
Ground for supply voltage and 0-10VDC Output signal
 Configuring the Sensor
Figure #1
Adjustable Sensor Settings:
The ACI/CO2 series uses a 16 Bit microprocessor that allows the design to incorporate the number of adjustable features at
no additional cost. These adjustments can be made using the keypad display units or by the PC based UIP program that
communicates to the sensor via a custom RS232 interface cable.
Factory Settings:
The standard factory settings are the typical settings used when a CO2 sensor is connected to a building control system. If
the installation is somewhat unique or specialized, 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 control systems).
Outlined on the top of the next page are the adjustable parameters of the sensor and the factory setting. In addition to these
adjustable features, the programming interface allows for a fast and simple adjustment of sensor calibration. See Figure #2
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2305 Pleasant View Rd. Middleton Industrial Park Middleton, WI 53562
PH: (608) 831-2585 FAX: (608) 831-7407
Adjustment
Altitude Above Sea Level
ABC LogicTM
Select Standard Setting
Customize Setting
PPM Range
Output Range
Proportional/Exponential Output
Relay Setpoint
Relay Hysteresis
Range
Factory Setting
0 to 10,000
4-20 mA/0-10 VDC
Select One
0 to 10,000 PPM
0 to 10,000 PPM
0 to 2,000
4-20 mA/0-10 VDC
Proportional
1,000 PPM
50 PPM
Figure #2
0 to 10,000 Ft
On/Off
1 to 9
0 Ft
On
1
n When to Use Programming Features
Altitude:
All ACI/CO2 series products are calibrated at sea level. As altitude increases, the density of the air around us slightly
decreases. This natural phenomenon affects the accuracy of all gases and introduces an error of approximately -3% of the
reading per 1000 ft of elevation. Much of the urbanized world is at an elevation of less than 1000 ft meaning that the
altitude has very little effect on the reading and no adjustment is necessary. However, users in locations significantly higher
than sea level such as Denver, Colorado may want to consider adjusting for elevation based on altitude to have the most
accurate reading. The altitude setting can be adjusted on the unit in 500 ft increments.
ABC LogicTM Self-Calibration System:
All ACI/CO2 series commercial sensors are factory set with the ABC LogicTM (Automatic Background Calibration) self
calibration feature ON. This feature allows the sensor to continually recalibrate itself when the indoor concentrations drop
to outside levels while the building is unoccupied. Generally, a building must be regularly unoccupied (with the exception
to cleaning and maintenance staff) for 4 hours or more for this self-calibration system to operate properly. Under these
conditions, ABC LogicTM should maintain sensor calibration over the lifetime of the sensor. The ABC LogicTM should be
turned OFF where a building is continuously occupied for 24 hours per day, or where there could be significant sources of
non-occupant related CO2 such as greenhouses, breweries, and other industrial and food processing applications.
Pre-Programmed Settings:
In addition to the factory setting for the ACI/CO2 series sensors, there are (9) standard settings that can easily be selected
using the keypad (display units only) or the PC based UIP program. The chart below describes each of the settings. The
definitions for some of the terms used in the chart are described in more detail as part of the custom settings section to
follow.
Settings 1, 2, and 3 are applicable for automated or computerized building control systems.
Settings 4, 5, 6, and 7 are specifically designed for operation with economizer controls and actuators where a 0-10
VDC signal will provide 0 to 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 intended for use in applications related to occupational health and safety where users may want to measure
concentrations in relation to the 5000 PPM 8 hour exposure levels established by OSHA (Occupational Safety and
Health Administration.)
Setting 9 is intended for use in parking garages where CO2 can be used as an indicator of the presence of combustion
fumes. As part of most types of combustion, CO2 is generated at a rate that is 50 times or more of other more harmful
contaminants. This is particularly the case with the extensive use of catalytic converters that tend to remove most of
the carbon monoxide from vehicle exhaust. The 700 PPM setting should maintain levels of other exhaust
contaminants well below levels of concern.
Custom Settings:
In addition to the (9) standard settings programmed into the ACI/CO2 series sensors, users can also custom program the
sensor for their own application. Outlined below is a brief description of each of the adjustable custom settings: (See
Figure #3)
2305 Pleasant View Rd. Middleton Industrial Park Middleton, WI 53562
PH: (608) 831-2585 FAX: (608) 831-7407
II-135
Setting
No.
Type of Equiptment
Type of
Output
1
Proportional
Proportional
Any
Exponential
Any
4
Interface w/ Standard
Building Control System
Interface w/ Standard
Building Control System
Interface w/ Standard
Building Control System
Economizer (HVAC)
Ventilation
Rate
(CFM/person)
Any
Proportional
15
5
Economizer (HVAC)
Proportional
20
6
Economizer (HVAC)
Exponential
15
7
Economizer (HVAC)
Exponential
20
8
Health and Safety
Proportional
NA
9
Parking/Air Intakes/
Loading Docks
Proportional
NA
2
3
Analog
Output
CO2 Control
Range (PPM)
0-2000
Optional Relay
Setpoint
(PPM)
1000
Relay
Hysteresis
(PPM)
50
0-10V
4-20 mA
2-10V
7-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
0-2000
1000
50
0-2000
1100
50
0-1100
1100
50
0-900
900
50
0-1100
1100
50
0-900
900
50
0-9999
5000
500
0-2000
700
50
Figure #3 - Standard Settings Available via the keypad (Display units only) or PC based UIP Interface (All Units).
Control Range: The range that will correspond to the analog signal output range. The range consists of a low level and a
high level in PPM. Setting this range does not limit the actual measurement or display range.
Analog Output Range: Can be expressed in V or mA. This range will correspond to the range of CO2 concentrations
established in the measurement range. On the ACI/CO2 series sensors, a V and mA output is selected based on the wiring
terminals. It is possible to simultaneously connect to both the V and mA outputs.
Proportional or Exponential Control: Proportional (linear) control increases the signal output in proportion to the
increase in CO2 concentrations for the measurement range and the analog output range selected. Exponential control
provides an output function that is exponential over the selected range of the sensor. The effect of the exponential output is
to initially introduce more ventilation to the space as concentrations are at the lower level of the control range. The
exponential output is particularly useful for areas of potential high occupancy and high air volume where significant time
may be required for CO2 levels to build up. Potential applications include arenas, gyms, auditoriums, and large conference
areas. Examples of both types of outputs are provided below. (See Figure #4)
Design Ventilation Rate
Equilibrium CO2 Concentration
for Target Ventilation Rate
(15 CFM= 700 PPM)
Ventilation
Based On
CO2 DCV
Exponential Control Approach
Proportional CO2 Control Approach
Minimum Position = Vs
Maximum Position = Vs+Vp
Relay Control Approach
Dead Band Setting Setpoint
Base Ventilation for Sources
500
1000
Inside /Outside CO2 Differential
Figure #4: Proportional and Exponential Control
Relay Setpoint: Establishes the level at which the on-board relay will activate. The relay is a Double Pole Single Throw
(DPST) relay that allows the user to operate the relay Normally-Open (N/O) or Normally-Closed (N/C) based on the
selection of wiring terminals connected on the sub-base.
Relay Hysteresis (Dead Band): Is the point at which the relay will deactivate or de-energize. It is entered as a PPM value
below the setpoint. A sensor with a relay setting of 1000 and a hysteresis of 50 would activate at 1000 PPM and deactivate
at 950 PPM.
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2305 Pleasant View Rd. Middleton Industrial Park Middleton, WI 53562
PH:(608) 831-2585 FAX: (608) 831-7407
n Adjusting the Sensor with the UIP Program
The UIP (Model 2072) is a User Interface Program designed to work with the ACI/CO2 series ventilation controllers. The
program offers a windows interface which enables the user to make quick, easy adjustments to the output, elevation, relay
setpoint, hysteresis, and more. It can also be used, along with the calibration gases, to calibrate the sensor. This program is
especially useful for the units without a display.
All of the ACI/CO2 sensors that have a display and pushbuttons will allow you to review and change the sensors operating
parameters. The UIP 2072 program allows you to make these same adjustments to all ACI/CO2 sensors regardless of
whether they have a display or pushbuttons. The UIP accessory package comes with the program and cables for connecting
the sensor to a laptop computer that has a serial communications port. Simply plug the computer cable into the sensor’s
RJ45 connector and the program is ready to use.
n Adjusting the Sensor with On-Board Keypad
(Display Units Only)
Button Functions:
[CLEAR]
-Resets Menu
-Returns to Normal Menu
[MODE]
-Toggles to Next Menu Item
[ENTER]
-Press to Lock Menu
[UP/DOWN]
-Increase/Decrease Selection Value
NON-STANDARD EDIT MODE
> NONSTD
From
> 0 PPM
TO
> 2000 PPM
SCALE
> LINEAR
OUTPUT
> VOLTS
V FROM
> 0V
V TO
> 0V
RELAY
> 1000 PPM
HYSTERS
> 50 PPM
Return to
Main Menu
Flowchart Showing Sequence of Non-Standard Edit Mode
Altitude Correction and ABC LogicTM (On/Off):
1. After a 2 minute warm-up period, press [CLEAR] + [MODE] and hold at least 5 seconds until the sensor enters
the edit mode.
2. The first menu will be altitude correction. The adjustments will Increase/Decrease in 500 ft increments. To do
this use the [UP/DOWN] rocker button to adjust to the proper altitude.
3. Press [ENTER] to lock in value and press [MODE] to proceed to ABC LogocTM.
4. Use the [UP/DOWN] Rocker button to switch to ON or OFF.
5. Press [ENTER} to lock in value then press [MODE] to proceed to Normal Mode.
Note: It is recommended that the ABC LogicTM feature be left ON for the best sensor operation.
Selecting a Pre-Programmed Setting:
The pre-programmed settings shown in Table 3 are factory set and cannot be changed. These settings can be selected from
the Standard Settings (STDSET) menu. The altitude and ABC LogicTM features can be changed without entering the
Standard Settings (STDSET) menu.
1.
2.
3.
4.
5.
After 2 minute warm-up period, press [CLEAR] + [MODE] and hold at least 5 seconds until the sensor edits the
edit mode.
Press [MODE] 2 times. You will enter the STDSET menu.
Use the {UP/DOWN] Rocker Button to toggle to the NONSTD menu.
Press {MODE] to move through the variables. Use the [UP/DOWN] button to toggle to the desired setting.
Press [ENTER] to lock in the selection then press [MODE] to continue to the next variable.
2305 Pleasant View Rd. Middleton Industrial Park Middleton, WI 53562
PH: (608) 831-2585 FAX: (608) 831-7407
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