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Specified Controls SC-CO2-TH Manual

Indoor co2, temperature and humidity monitor
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SC-CO2-TH

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Summary of Contents for Specified Controls SC-CO2-TH

  • Page 1 SC-CO2-TH...
  • Page 2 Thank you for your purchase of the SC-CO2-TH CO2, Temperature and Humidity Monitor. This device Indoor CO2, Temperature and Humidity Monitor has been designed, built, and tested to be an exceptionally reliable product. Great effort has been taken to ensure ease of use and reliable monitoring of Carbon Dioxide, temperature, and humidity within an interior space.
  • Page 3 Great care has been taken in the preparation of this manual. However, Specified Controls takes no responsibility for errors or omissions contained in this document. It is the responsibility of the installer to ensure that this product and any equipment connected to it operates in a safe and efficient manner.

  • Page 4: Lcd Display

    LCD Display Not all display elements or buttons shown may be active. The display is dynamic and functions not applicable will not be shown. The alarm mute button for example, will not be shown until the alarm is sounding. Page 4...

  • Page 5: User Operation

    User Operation The product requires very little user interaction. It will monitor the levels of carbon dioxide, humidity and temperature within the applied space and is capable of initiating alarms and corrective action if any of these exceed pre-set levels. When enabled, the user can press the “Force Fresh Air”...

  • Page 6: Terminal Layout

    Terminal Layout Use a small, flat bladed screwdriver and place it in the bottom center of the enclosure and pry to separate the display from the subbase. Take care not to drop the display as damage may occur. When reattaching, make sure no wiring is interfering with the pin connectors.
  • Page 7 O-10V Outputs There are three 0-10V outputs. One each for carbon dioxide, temperature, and relative humidity. All 0-10V output wiring is the same. Wire between the required output and the 0V / Com terminals. The output voltage will increase with increasing temperature, humidity, or carbon dioxide levels.
  • Page 8 Relay There is a single volt free relay with changeover contacts. The relay is rated to carry 30V @1A Max. Any voltage applied to the relay common terminal will switch between the normally open (NO) and normally closed (NC) terminals. This relay can be set to respond to high levels of temperature, relative humidity or carbon dioxide as selected in the installer options.
  • Page 9 Power Primary power can either be AC or DC from 12 to 30V. AC power is not polarity dependent however if using DC power ensure the positive voltage is applied to the top AC+ terminal and negative to the lower AC- terminal. Reverse polarity DC wiring will not cause damage but will simply will not power on.
  • Page 10 Power Up When you first apply power, the LCD will display all elements and then display the firmware version for a few seconds. During the next 180 seconds the display will countdown from 180 to 0 to permit the CO2 and other sensors to stabilize. During this countdown period no alarm conditions will be initiated.

  • Page 11: Installation And Mounting

    Installation & Mounting All sensing devices are contained within the enclosure. Therefore, it is important to locate it within the space to be monitored and controlled. The monitor should be installed in a location that represents the ambient space temperature. Do not install in an area where drafts are present, near the floor, behind doors or on an external wall.
  • Page 12 Make sure that you understand any changes made in this Installer options menu and if not, contact Specified Controls for clarification and advice. To enter the Installer menu first tap then press and hold the center of the display.
  • Page 13 To advance through the menu items tap the “NEXT” button and adjust the shown installer option with the Up / Down arrows. To exit the Installer menu and save changes press and hold the “NEXT” button for 3 seconds. After making changes in this menu DO NOT power down for 20 seconds or changes may be discarded.
  • Page 14 Calibrate Should you feel that the temperature sensor accuracy has drifted Temp you are permitted to apply a small, fixed offset. Default is 0.0. Options are +/- 5 deg C or F in 0.1 deg steps. Calibrate RH Should you feel that the humidity sensor accuracy has drifted you are permitted to apply a small, fixed offset.
  • Page 15 Options are 1 = Toggle mute. 2 = 1 Hour mute. 3 = 3 Hour mute. 4 = 12 Hour mute. Show Force The SC-CO2-TH display can be set to show a “force fresh air” Fresh Air button. If this button is pressed the CO2 sensor 0-10V output will...
  • Page 16 T1 T2 Input The remote inputs have multiple functions including: Function 0= Override onboard sensor with remote sensor. 1= Average onboard sensor with remote sensor. 2 = Force fresh air. 3 = Remote mute. 4 = Reserved. 5 = Report status to Mobus/BACnet.
  • Page 17 Temp Max This option permits you to select the highest temperature value to Value be used by the SC-CO2-TH. Temperatures above this value will be ignored. (See graph on page 5) Default is 100 degrees. Adjustments are -20 degrees to 150 degrees in 1-degree steps.
  • Page 18 (See graph on page 5) Default is 0V. Adjustments are 0-10V in 0.5V steps. This option permits you to select the lowest RH value to be used by the SC-CO2-TH. RH below this value will be ignored. (See graph Value on page 5) Default is 0 RH.
  • Page 19 This option permits you to select the lowest CO2 value to be used by the SC-CO2-TH. CO2 levels below this value will be ignored. Value (See graph on page 7) Default is 800ppm. CO2 Adjustments are 0 to 2000ppm in 50ppm steps.
  • Page 20 Amber Temp This option sets the threshold of where the backlight turns from Backlight green to amber for temperature. Threshold Default is Off. Options are Off, then 0 to 100 degrees in 1-degree steps. Red Temp This sets the threshold of where the backlight turns from amber Backlight to red for high temperature.
  • Page 21 Communication The monitor has an isolated RS-485 communications capability. Protocol You can select ModBus RTU or BACnet MSTP communications protocol. The full stop in the temperature display will flash if communications are running. Default is 0 = Modbus. Options are 0 = Modbus. 1 = BACnet.
  • Page 22 CO2 Relay Off This value permits you to define, in PPM, how far from the CO2 Threshold alarm point the alarm will deactivate. Default is 20ppm. Adjustable from 20 to 1000ppm. Reset Setting this value to 1 then exiting the installer menu will factory reset the monitor Page 22...
  • Page 23 Typical Wiring Examples The following contains wiring examples that may be helpful in setting up the monitor for your specific application. These wiring examples may require adjusting various options in the Installer menu. For example, if the volt free relay is used to control a 24V power open / closed damper based on CO2 levels, you must activate and define the CO2 Relay Alarm on page 14.
  • Page 24 In this example the CO2 and RH is controlling the VSD with a high select. Both the CO2 and RH outputs are individually scalable so the CO2 range can be 450ppm to 1,000ppm and the RH range can be 75% to 100%. Also, the RH output can be limited to 7V max if required.
  • Page 25 An open/close or an off/on output can be controlled by the monitor using the volt free relay provided. The relay threshold can be individually adjusted for each sensor. (30V @ 1A max) Active Ventilation Function By fitting an outside air sensor, the monitor can bring in fresh air to improve room air quality if the outside air temperature is suitable.
  • Page 26 In the Installer menu you must activate the Active Ventilation function by setting the inside and outside air temperature thresholds (page 16 explains this) and defining the active ventilation output options. Once you have completed these three steps the letter “A” will be shown the in the lower right corner of the LCD to confirm the Active Ventilation function is active.
  • Page 27 If you would like, you can have both the temperature 0-10V output and volt free relay used for advanced ventilation. In the Active Ventilation Output options menu settings select both relay and temp 0-10 (option 3). This permits you to open the fresh air damper and turn a fan on for example if outside air is suitable.

  • Page 28: Specifications

    Specifications Power 12 to 30V AC or DC Relay Output 30V AC/DC @ 1A Max Touch Method “XY” Resistive Back Light Multicolor LED (Green, Red, Amber) Back Light Life 40,000 Hours to Half Intensity Operating Temperature 23°F To 122°F Operating RH 0 To 95% (Non-Condensing) 0-10V Outputs 5ma Max...
  • Page 29 www. specifiedcontrols.com SC-06-1346-092222 Page 29...

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