Greystone Energy Systems CDD4A1 Series User manual

Page 1
INTRODUCTION
The room CO2transmitter device uses a highly accurate and reliable non-
dispersive infrared (NDIR) sensor in an attractive, low prole enclosure for
room applications to monitor CO2levels. The sensor uses dual wavelength
optics and LTA (long term adjustment) signal processing technology
to deliver industry leading long-term accuracy and reliability. These
technology features ensure optimum measurement stability for both
periodic and constant occupancy applications, so the device is equally
suitable for the classroom or the hospital room.
Standard features include a eld selectable output signal of either 4-20
mA, 0-5 Vdc or 0-10 Vdc for the highest versatility, programmable CO2
measurement span, a backlit alpha-numeric LCD and easy menu operation
for conguration.
Optional features include a resistive temperature sensor output (with LCD display of temperature in either
°C or °F), a control relay with programmable setpoint, hysteresis and time delay, and a dry-contact override
switch.
BEFORE INSTALLATION
Read these instructions carefully before installing and commissioning the device. Failure to follow these
instructions may result in product damage. Do not use in an explosive or hazardous environment, with
combustible or ammable gases, as a safety or emergency stop device or in any other application where
failure of the product could result in personal injury. Take electrostatic discharge precautions during
installation. De-energize the power supply prior to installation, this device is intended for indoor air
conditioned spaces, contact factory for other applications. Do not exceed device ratings. This product
is not intended for life-safety applications.
MOUNTING
The transmitter installs directly on a standard electrical box and
should be mounted ve feet from the oor of the area to be
controlled. Do not mount the sensor near doors, opening windows,
supply air diusers or other known disturbances. Avoid areas where
the detector is exposed to vibrations or rapid temperature changes.
Prevent measurement errors by sealing the wall or conduit openings
to prevent air migration from the wall cavity.
The cover is hooked to the base at the top edge and must be removed
from the bottom edge rst. Use a small Phillips screwdriver to loosen
the security screw as shown in Figure 1. Complete removal of the
screw is not required. Use the screwdriver to carefully pry each bottom
corner if necessary. Tip the cover away from the base and sit it aside as
shown in Figure 2.
The PCB must be removed from the base to access the mounting holes.
Follow anti-static procedures when handling the PCB and be careful
not to touch the sensors.
The PCB is removed by pressing the enclosure base to unsnap the
latch near the bottom edge, then the PCB can be lifted out of the base
as shown in Figure 3.
Figure 1
Figure 2
Figure 4
Figure 3
Cover PCB Backplate
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Room Carbon Dioxide Transmitter
CDD4A1 Series - Installation Instructions

Page 2
Sit the PCB aside until the base is mounted on the wall. For added protection, place the PCB in the supplied
anti-static bag.
Mount the base by screwing to an electrical box or directly to the wall as shown in Figure 4.
After the base is screwed to an electrical box or directly to the wall using the appropriate holes, remove the
PCB from the anti-static bag, feed connection wires through the center hole and place the top of the PCB
into the PCB holders on the backplate and snap the bottom of the PCB into place as shown in Figure 4.
Making wiring connections as per the Wiring Illustrations below and install the decorative cover by placing
the top of the cover into the cover holder on the top of the backplate and snapping the bottom into place
as shown in Figure 4. Tighten the security screw with a Phillips screwdriver.
WIRING
Deactivate the power supply until all connections are made to the
device to prevent electrical shock or equipment damage. Use 16-22 AWG
shielded wire for all connections (only ground the shield at the controller
end) and do not locate the device wires in the same conduit with wiring
used to supply inductive loads such as motors. Pull at least six inches of
wire into the enclosure and complete the wiring connection according
to the wiring diagram. Figure 6.
This is a 3-wire sourcing device. Connect the plus DC or the AC voltage
hot side to the PWR terminal and the common is connected to the COM
terminal. The device is reverse voltage protected and will not operate
if connected backwards. It has a half-wave power supply so the supply
common is the same as the signal common. Several devices may be
connected to one power supply and the output signals all share the same
common. Use caution when grounding the secondary of a transformer
or when wiring multiple devices to ensure the ground point is the same
on all devices and the controller.
The CO2analog output is available on the CO2terminal. This signal is switch selectable for either 4-20 mA
or voltage output (0-5 / 0-10 Vdc) see Figure 7 and connects to the controller analog input. Check the
controller Analog Input to determine the proper connection before applying power. Both current and
voltage signals are referenced to the COM terminal. The current output operates in the active mode and
does not require a loop power supply (the signal current is generated by the transmitter and must not be
connected to a powered input or device damage will result).
Figure 5
Figure 7 Figure 8
Figure 9
Figure 6
Power Supply
Wiring for CO2output signal and
24 Vdc power from controller
Wiring for all output and external 24 Vac power
transformer or external 24 Vac power supply
CO2
COM
PWR
RELAY
SWITCH TEMP
CO2
COM
PWR
Analog Input
COMMON
+24 Vdc
COMMON
Digital Input
Digital Input
COMMON
Analog Input
COMMON
Analog Input
COMMON
COMMON
24 Vac
Controller
Alarm
Controller Controller
24 Vac Transformer /
Power Supply
mA
VOLT
Current
4-20 mA
Voltage
0-5 or 0-10 Vdc
VOLT
mA
mA
VOLT
CO2
COM
PWR
TEMP
SWITCH
RELAY
MENU
UP
DOWN
CO2 SENSOR
OVERRIDE
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Page 3
OUTPUT SCALING
The CO2output signal is scaled such that 4-20 mA (or 0-5 / 0-10 Vdc) equals 0-2000 ppm by default. The
signal span may be changed via the Setup Menu from 1000 to 5000 ppm in 500 ppm increments.
STARTUP MODE
Verify the device is properly wired and connections are tight. Ensure the mA / VOLT switch is set for the
correct signal type. Apply power and the LCD will indicate the software version number, the output
signal type and then the sensor will begin a one minute warm-up countdown. When the warm-up time
expires the device will enter normal mode.
NORMAL MODE
The sensor will begin reading the CO2level (and temperature if it is installed), output the correct analog
signal and display the values on the LCD. If the relay is installed, the measurements will be compared to
the setpoint and appropriate action taken. The keypad is monitored and if the <MENU> key is pressed
the device will enter the Setup Menu. The Setup Menu can be accessed to congure the device for
required operation.
RELAY MODE
The optional relay can be used as an alarm signal to indicate that a setpoint has been exceeded. For
the basic CO2product, the relay may be congured via the Setup Menu as a high or low alarm and the
setpoint value, hysteresis and on-delay time may be set. The relay will activate and close the contacts
if the CO2measurement goes above the setpoint (for a high alarm) or below the setpoint (for a low
alarm). If required, this action can be delayed by a time period (relay delay time) to prevent false alarms.
After the relay is activated, the measurement must fall below the setpoint - hysteresis value (for a high
alarm) or go above the setpoint + hysteresis value (for a low alarm) to deactivate the relay and open the
contacts. The high/low assignment, setpoint, delay time and hysteresis values may all be programmed
via the Setup Menu as required.
If the optional temperature sensor is installed, the relay operation may be assigned to operate as a
temperature high or low alarm instead of a CO2alarm. All the same relay parameters may be congured
to set up the alarm as required.
SETUP MENU
The device has several parameters that can be congured locally via the Setup menu using the keypad
and LCD. Any changes made are saved in non-volatile memory and are restored in case of a power loss.
The menu can be accessed at any time after the start-up mode and if there is 5 minutes of inactivity the
menu will close and normal operation will continue.
To enter the menu, press and release the <MENU> key. This will enter the Setup Menu step 1, pressing
the <MENU> key a second time saves the setting and advances to step 2. Each press of the <MENU> key
saves the current setting and advances the menu item. The <UP> and <DOWN> keys are used to make
changes to program variables by scrolling through the available options. The rst column below shows
what will be displayed on the LCD, including the default value.
<MENU> Press and release the <MENU> key to enter the Setup Menu
The optional relay output connects to the RELAY terminals. The relay output is completely isolated and
has a Normally Open (NO) signal. This signal can be used to directly control an alarm or ventilation fan. See
specications for contact ratings. See Figure 8.
The optional override signal is a two-wire dry contact normally open switch connected to the SWITCH
terminals. See Figure 9.
The optional two-wire temperature sensor output is available with various RTDs and thermistors to suit all
control applications and is available on the TEMP terminals. See Figure 9.
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Page 4
Altitude
0 m
The Altitude value allows CO2compensation for local atmospheric pressure and
altitude and ensures the highest CO2accuracy. Altitude can be changed from 0 to
2550 meters in 50 meter steps using <UP> or <DOWN>. It will take a few moments
to change the setting, then the menu will advance to the next step. Factory default
is 0 m (sea level).
<MENU> Press to advance to next menu item
2. ALTITUDE
V Output
0-5 Vdc
The V Output value controls the analog output voltage span if the PCB switch is set
to VOLT. V Output can be set to either 0-5 Vdc or 0-10 Vdc using <UP> or <DOWN>.
This setting has no eect if the PCB switch is set to mA. Factory default is 0-5 Vdc.
<MENU> Press to advance to next menu item
3. OUTPUT VOLTAGE SPAN
Output
Direct
The Output value controls the analog output signal direction. Use <UP> or
<DOWN> to change the setting from Direct (4-20 mA, 0-5 Vdc or 0-10 Vdc) to
Reverse (20-4 mA, 5-0 Vdc or 10-0 Vdc) if reverse action is required. Factory
default is Direct.
<MENU> Press to advance to next menu item
4. OUTPUT SIGNAL DIRECTION
The Output Test value controls the analog output signal for testing purposes.
Use <UP> or <DOWN> to toggle the output signal to OFF (normal operation),
MIN (minimum output) or MAX (maximum output). The actual output signal will
depend on the PCB switch position (mA or VOLT) and the V Output setting (for
voltage operation). Press <MENU> to set it back to OFF and advance. Factory
default is OFF.
Output
Test OFF
<MENU> Press to advance to next menu item
5. OUTPUT TEST
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
Temp
Units °C
The Temp Units setting is used to select °C or °F display of temperature. Use
<UP> or <DOWN> to select. Factory default is °C.
6. TEMPERATURE UNITS
CO2 Span
2000 ppm
The CO2Span value controls the analog output scaling. CO2span can be changed
from 1000 to 5000 ppm in 500 ppm increments using <UP> or <DOWN>. If CO2
Span = 2000 ppm, then the output signal is scaled 0-2000 ppm = 4-20 mA. Factory
default is 2000 ppm.
1. SPAN
Only if Temperature Sensor option Installed
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Page 5
BackLite
Auto
The BackLite setting is used to control how the LCD backlight functions. Use
<UP> or <DOWN> to select either Auto, O or On. Auto means the backlight only
lights when a menu is accessed or when the setpoint is activated (ie: when a key
is pressed), O means the backlight is always o and On means it is always on.
Factory default is Auto.
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
8. BACKLIGHT
Only if Relay option Installed
Only if Temperature Sensor option Installed
Relay
CO2
T Oset
0.0 °C
The Relay setting allows the relay alarm to be assigned to either CO2High,
CO2Low, Temp Hi or Temp Low as applicable. Use <UP> or <DOWN> to select.
Factory default is CO2High. If the temperature sensor is not installed then the
options will not be available.
The T Oset value allows calibration of the temperature value displayed on the
LCD. Units (°C/°F) follow the Temp Units setting. Use <UP> or <DOWN> to add
or subtract an oset from the temperature value. The range is -5.0 to 5.0 °C or
-9.0 to 9.0 °F in 0.1° increments. Factory default is 0.0 °C.
10. RELAY
9. TEMPERATURE OFFSET
Relay SP
1000 ppm
Relay SP
1000 ppm
The relay setpoint depends on the relay assignment set previously. Use <UP>
or <DOWN> to change the setting within the limits as shown in the table.
Note that only the one previous selection will be available. Note that a high
alarm activates when the measurement exceeds the setpoint and a low alarm
activates when the measurement goes below the setpoint. Use <MENU> to
save and advance.
or
11. RELAY SETPOINT
RELAY ASSIGNMENT DEFAULT SETPOINT SETPOINT RANGE RESOLUTION
Temp High 26.0°C / 79.0°F 5.0 to 40.0°C / 40.0 to 100.0°F 0.5°
Temp Low 15.0°C / 59.0°F 5.0 to 40.0°C / 40.0 to 100.0°F 0.5°
CO2High 1000 ppm 500 to 4000 ppm 100 ppm
CO2Low 1000 ppm 500 to 4000 ppm 100 ppm
Display
CO2 ppm
CO2
1235 ppm
Temp
24.3 °C
1235 ppm
24.3 °C
CO2
1235 ppm
Temp
24.3 °C
Display is used to control what information is displayed on the LCD. The
selections depend on the installed options. Use <UP> or <DOWN> to select
either CO2ppm, Temp, CO2+Temp, Rotate or None. Factory default is CO2ppm.
For a basic CO2only device, the selection is limited to CO2ppm or None.
CO2ppm Only the actual ppm value of
the CO2reading will be displayed
Temp Only temperature is displayed
(°C or °F depends on units setting)
CO2& Temp CO2ppm and temperature both
displayed at the same time
Rotate All available sensor readings rotate
at 2 second intervals
None No measurement information is displayed in
normal mode, the menu will still display in
Setup Menu mode
7. DISPLAY
<MENU> Press to advance to next menu item
Only if Temperature Sensor option Installed
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Page 6
Only if Relay option Installed
Relay
Dly 0min
Relay
Test OFF
Use <UP> or <DOWN> to change the Relay Delay time within the limits. The
delay time may be set from 0 to 9 minutes in 1 minute increments to prevent
false alarms. The default is 0 minutes (no delay).
Use <UP> or <DOWN> to toggle the relay ON or OFF to test the relay
operation. Press <MENU> to reset to OFF and advance.
13. RELAY DELAY
14. RELAY TEST
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
RELAY ASSIGNMENT DEFAULT SETPOINT SETPOINT RANGE RESOLUTION
Temp High or Low 0.5°C/F 0.2 to 5.0°C/F 0.1°C/F
CO2High or Low 50 ppm 25 to 500 ppm 25 ppm
<MENU> Press to advance to next menu item
This item is used to calibrate the CO2sensor by applying 1000 ppm CO2calibration gas
directly to the sensor. Consult the calibration instructions for the detailed procedure.
After applying the gas for several minutes, hold either the <UP> or <DOWN> key for 5 seconds to start
the gas calibration. The display will blink during the calibration time (approximately 10 seconds).
The display will change to “Calibrat / Done” when the calibration is complete. The display may indicate
“Calibrat / Fail” if the calibration fails.
Calibrat
1000 ppm
<MENU> Press to exit the menu and return to normal mode
15. CO2CALIBRATION
CALIBRATION
Calibration with gas requires a eld calibration kit (CD-CALKIT) with pressure regulator, tubing, sensor
adapter and bottle of CO2gas. The certied calibration gas is applied directly to the CO2sensor to
perform a gas calibration.
Ensure the regulator knob is turned o and then hand tighten the regulator to the 1000 ppm CO2gas
bottle. A length of tubing should be connected between the regulator output and the sensor adapter
hood.
Remove the cover of the device to be calibrated to expose the gas sensor. Carefully install the sensor
adapter hood over the CO2sensor on the PCB. The adapter should t snuggly and securely over the
sensor and remain in place during the entire calibration cycle. This will ensure a stable 1000 ppm CO2
environment during calibration. Turn the regulator knob on to allow gas to ow to the sensor. The CO2
reading on the LCD will begin to approach 1000 ppm. Wait 3 to 5 minutes until the CO2reading stabilizes.
Relay Hy
50 ppm
Relay Hy
0.5 °C
The Relay Hysteresis will depend on how the relay is assigned. Units will either
be in ppm for CO2or °C/°F for temperature.
Use <UP> or <DOWN> to change the Relay Hysteresis within the limits as
shown in the table.
Note that a high alarm resets when the measurement goes below (setpoint
- hysteresis) and a low alarm resets when the measurement goes above
(setpoint + hysteresis). Note the value is somewhat dependent on the setpoint
(ie: if the CO2setpoint is 500 ppm then the hysteresis cannot be 500 ppm).
or
12. RELAY HYSTERESIS
<MENU> Press to advance to next menu item
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PRINTED IN CANADA
Page 7
SPECIFICATIONS
Gas Type Detected.................................................Carbon dioxide (CO2)
Sensor Type ..............................................................Dual wavelength non-dispersive infrared (NDIR)
Sensor Accuracy......................................................± 50 ppm + 3% of reading
Measurement Range.............................................0-2000 ppm (default), adjustable 1000 - 5000 ppm
Pressure Dependency...........................................< 1% of reading / kPa
Response Time ........................................................90 seconds (T90)
Warm-Up Time.........................................................1 minute
Sensor Coverage Area...........................................100 m2(1000 ft2) typical
Sensor Life Span......................................................>10 years
Transmitter Accuracy ............................................±0.25% of span
(including linearity, hysteresis and repeatability)
Power Supply...........................................................24 Vdc ±20% or 24 Vac ±10%
(non-isolated half-wave rectied)
Protection Circuitry................................................Reverse voltage and transient protected
Input Voltage Eect...............................................Negligible over specied operating range
Output Signal Type ................................................4-20 mA (3-wire), 0-5 or 0-10 Vdc (eld selectable)
Current Consumption...........................................Current: 75 mA @ 24 Vdc max, 150 mA @ 24 Vac max
Voltage: 50 mA @ 24 Vdc max, 100 mA @ 24 Vac max
Output Drive @ 24 Vdc .........................................Current: 550Ω max
Voltage: 10,000Ω min
Ambient Operating Range..................................-10 to 50°C (14 to 122°F), 5 to 90 %RH non-condensing
Storage Conditions................................................-30 to 70°C (-22 to 158°F), 5 to 90 %RH non-condensing
LCD Display Units ...................................................ppm (CO2), °C/°F for optional temperature sensor
Display Range..........................................................0-5000 ppm, 0 to 50°C (32 to 122)°F
Display Size...............................................................35mm W x 15mm H (1.4" x 0.6")
Digit Height..............................................................2-line x 8 character
OPTIONAL TEMPERATURE SENSOR
Type.............................................................................Thermistor and RTD
Accuracy ....................................................................Thermistors: ±0.2°C (±0.36°F) @ 25°C (77°F)
Platinum RTD's: ±0.3°C (±0.54°F) @ 0°C (32°F)
Nickel RTD's: ±0.4°C (±0.72°F) @ 0°C (32°F)
Output........................................................................2-wire resistive
Optional Relay (2-wire output)..........................Form A (N.O.), 2 Amps @ 140 Vac / 30 Vdc
Optional Override Switch (2-wire output).....50 mA @ 12 Vdc max
Enclosure...................................................................White ABS, IP30 (NEMA 1)
84mm W x 119mm H x 29mm D (3.3" x 4.7" x 1.15")
Wiring .........................................................................Screw terminal block (14 - 22 AWG)
Approvals ..................................................................CE
Country of Origin.......................................................Canada
Enter the Setup Menu and use the <MENU> key to advance to the“Calibrat / 1000 ppm”item. Press
and hold either the <UP> or <DOWN> key for 5 seconds to start the gas calibration. When the display
starts to blink to indicate the device is calibrating, release the key. The calibration process will take about
10 seconds and then the LCD will indicate “Calibrat / Done” if the process was successful. If “Calibrat /
Fail” is displayed then the process may have to be repeated. Press the <MENU> key to return to normal
operation, shut o the gas supply and remove the sensor adapter.
DIMENSIONS
84mm
3.3"
58mm
2.3"
82.6mm
3.25"
29mm
1.15"
119mm
4.7"
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