After comparing the digital signal to preset values, the hub updates the display and relays. The CH-M housing has a NEMA 4X rating and is supplied with knockouts so that the control hub can mount directly to a standard four inch conduit box. A hinged cover secured by two screws makes it easy to gain access to the touchscreen for system configuration.
Features and Benefits • Limitless Possibilities ◦ Fully Configurable Zones, Relays, Setpoints, Delays, and Outputs ◦ Scalable System Size via Relay Expansion Packs • Increased Control ◦ On-Demand Ventilation Control by Gas Concentration, Timer Schedule, or User Input ◦ 7” Full-Color LCD Touch Screen •...
Technical Specifications Product Specifications Input Power 24 VAC, 50/60 Hz, 0.75 A Installation Category II (local level, over-voltage transients less than 500V) Storage Temperature -50°C to 120°C (-58°F to 248°F) Operating Temperature -20°C to 50°C (-4°F to 122°F) Humidity 10% to 90% (non-condensing) Ventilation Control Relays 125 VAC, 50/60 Hz, 5 A resistive, 250 VA inductive Relay Capacity...
Systemair has designed detectors so that the measurement ranges for each target gas meet the agencies’ requirements. Each target gas, for which Systemair currently produces a sensor, is listed below along with the relevant concentration specifications.
Operation Safety Notice Certain procedures and operations detailed in this manual require that specific precautions be taken prior to beginning the procedure or operation. When precautions are required, a notice will be printed in an appropriate location in the manual. The user is urged to read and understand all such notices.
Operation with the wrong power requirement will void the manufacturer’s warranty and the installer will be responsible for any damage that occurs. Contact Systemair before connecting power to the control hub or detectors if you are unsure of the correct power requirement.
This device uses an EMI power line filter to reduce unwanted noise. Connect the incoming power conductors to the line side of the filter. The load side of the filter is already wired to the input power terminals on the relay board. Be sure to ground the control hub at the center terminal of the line filter.
situation dictates. Follow the wiring diagrams on pages 20 through 23 to determine the proper connections at the hub. Step 4 – Relay Wiring The relay board inside the control hub has four relays with connections for both normally open (NO) and normally closed (NC) operation.
Step 7 – Testing the System The manual overrides on this control hub can be used to open and close the relays to verify that ventilation and warning equipment is connected properly. This feature can be accessed from the individual Relay Settings screens. Page 19 contains a more complete procedure for testing the system.
Installation Mounting the Control Hub The control hub is the central hub for monitoring and controlling all of the detectors. However, it does not necessarily need to be mounted in a centralized location. It should be mounted indoors in a dry location where authorized users will have easy access and the display can be easily read.
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• Do not locate any detector further than 4000 feet from a control hub or expansion pack. • The types of gases each unit is designed to monitor have varying densities. For CO and NO , mount the unit at the average breathing height – approximately 5 to 7 feet from the floor.
surface with screws. Securely tighten the fitting nut on the inside of the conduit box so it will not loosen over time. • Attach the housing to a solid support base using screws through the mounting feet. Find a flat area at least six inches high by six inches long and place the back of the housing flat against it.
Contact Systemair MFG. Inc. before connecting power to the control hub and detectors if you are unsure of the correct power requirement. This device uses an EMI power line filter to reduce unwanted noise. Connect the incoming power conductors to the line side of the filter.
CAUTION It is very important that the power and signal connections between each detector and between the detectors and the control hub be correct. If the connections are wired incorrectly, damage to both the detectors and the control hub will occur. Use a cable with color-coded conductors and make sure that the same conductor connects to the same terminal on each detector and the control hub.
Figures 1 and 2 on page 20 show typical alarm wiring. Connecting the Voltage or Current Proportional Output The CH-M and REP-M Relay Expansion Pack include circuits that provide either a current loop or voltage proportional output. Each output produces a linear response over the full scale range of the average of all connected sensors in a zone.
How the Hub Controls the Ventilation Equipment The CH-M allows the user to configure a ventilation control system in a variety of ways to meet almost any specification. Below are the components used to build these configurations. If requested at the time of order, Systemair will customize the configuration to match a job requirement so that the only field work needed is installation.
Analog Output Each CH-M and REP-M Relay Expansion Pack is equipped with one analog output that generates a 4-20 mA, 2-10 VDC, 1-5 VDC, or 0.2-1 VDC signal. This signal is proportional to the average concentration of target gas present in the assigned zone. It may be used for monitoring gas or for controlling a VFD.
Navigating the User Interface Home Screen The Home Screen is where the control hub will be most of the time. This page is the central hub for displaying all of the information available on the hub. While not interacting with the hub, the Home Screen will automatically scroll through each configured zone.
Zone Screen The Zone Screen gives more information about a zone. Here, the user can see each relay configured to that zone and each sensor configured to that relay. Sensor icons will display the current gas concentration value. As with the Home Screen, the zone concentration values will change colors depending on the setpoints.
Passcode Entry Screen Upon pressing the “Settings” icon, the user will be asked for a passcode. This passcode is assigned at the factory and included in the packaging with every order. Entering the passcode will allow the user to make changes to the system. After five minutes of inactivity, the hub will automatically return to the Home Screen and the passcode will need to be reentered.
Factory Default Settings Unless otherwise specified on the order form, the following settings will be used to configure the control hub. Setting Default Sensors All Sensors Configured Relays 4 Relays Relay 1 (Low Alert) All Sensors On-Delay 1 minute Off-Delay 1 minute Activation Type Single...
Current Date/US Central Time (CT) Daylight Savings Time Correction Each detector ordered will be assigned an address 1 through 128 as applicable. Detector addressing should not be changed without first consulting Systemair technical support. Adjusting the Hardware Settings Changing the Detector Address The detector address is set by SW1 on the top, right side of each sensor board using a binary counting system.
Adjusting the Software Settings Adding/Removing Sensors To configure the sensors, navigate to Settings > Sensor Map. Active sensors will appear in green while inactive sensors will appear in gray. Each sensor icon will also include the gas type and current value (if present). If a sensor is not communicating with the control hub, it will default to gas type “CO”.
Adding/Removing Zones Only zones that are configured will appear on the Home Screen. To add a zone, go to Settings > Zone Settings and select “Add/Remove Zone”. Press “Add Zone” in the pop-up window. There must always be at least one zone present for the system to function. A maximum of 32 zones may be configured.
Adjusting the Delays On-delays and off-delays can be set for each relay to adjust the duration before energizing/de- energizing the contacts. Navigate to Settings > Relay Settings > Relay #. Then tap “Setpoint Delay” and use the arrows to adjust the values. If no delay is desired, set the delay time to “0:00”.
To adjust the activation type for a relay, go to Settings > Relay Settings > Relay # and select “Activation Type”. To adjust the activation type for a zone alarm, go to Settings > Zone Settings > Zone # and select “Alarm Settings”. Not all activation types will always be available. Adjusting the Zone Display Type The zone display controls what gas concentration values are shown on the Home Screen.
will only dissociate that sensor from the current relay. Any other assignments will remain in effect. Assigning Relays In order for a relay to display its information, it must be assigned to a zone. To assign a relay, go to Settings > Zone Settings > Zone #. Then tap “Add/Remove Relay”. This will bring up the Relay Map to display all currently configured relays.
Changing Relay Levels Relay levels are used to coordinate the operation of multiple relays on a single zone. Relays of the same level can remain engaged at the same time. Relays of a higher level will disengage relays of a lower level when engaging themselves. This configuration is primarily intended for multi-speed fans but it may also be used for operating multiple equipment types in stages.
Changing Zero Setpoints Certain gases may have different ambient concentrations than the default settings. To adjust the zero setpoint to the desired ambient concentration, navigate to Settings > Zero Setpoints. Then use the arrows to change the normal ambient concentration levels for each gas. Levels specified here are used to align the scale for the proportional output.
Setting Automatic Overrides Each relay can schedule up to four separate times for an automatic override. Of these times, three may be used to force the relay into an active state while one may be used to force it into an inactive state.
Should too many changes be made that cause the hub to operate in an undesirable manner, Two options are available to reset the CH-M under Settings > Reset Options. “Reset to Default” will erase any custom sensor, relay, or zone settings while leaving all assignments intact.
23 on page 62 of this manual. As an example, a Systemair Carbon Monoxide Detector has a full scale output of 200 PPM CO. For the 4-20 mA output mode with a single sensor configured, 0 PPM CO would equal 4 mA while 200 PPM CO would equal 20 mA.
Obtaining the Best Operation This hub is designed to control the ventilation system in response to a rising or falling concentration of the target gas at its detectors. No two installations will be exactly the same. Different ventilation components, the number of gas producing sources, air flow patterns inside the room, the total room volume, and the exact location of the detectors influence how effective the system is in controlling the target gas concentration.
100% response. If the response time is too slow or the concentration displayed is outside of acceptable tolerance, the sensor should be recalibrated or replaced. To ensure proper response and accuracy, Systemair recommends testing toxic detectors once every six months and combustible detectors once every three months.
Replacing the Sensor The sensor’s useful lifetime depends greatly upon its operating conditions. Continuous operation around large or numerous gas sources may shorten the sensor’s useful life. A recommended recalibration date is recorded on the front hub label of each detector. To replace a sensor module, remove the two retaining screws and carefully open the cover.
Suggested Repair Parts Below is a list of parts that may be replaced inside Systemair Control Hub and Remote Detector products. Please consult your local Systemair representative for pricing and availability. Part Number Description 494132 CO Sensor | Carbon Monoxide Sensor...
Troubleshooting Error Messages The CH-M is programmed to display error messages to indicate a problem condition with the unit. The bottom center of the Home Screen will scroll through each message present. When an error occurs, the alarm will chirp and a silence button will replace the calendar icon to allow a user to mute the alarm.
If a sensor module is configured for a gas type that is not supported by the current firmware version on the control hub, this error will appear on the display. Contact Systemair Technical Support to update the firmware. Relay Board # Communication Loss This error message means that the hub is unable to communicate with the indicated relay board and attempts to reestablish communication have failed.
The real-time clock circuitry is powered by a single CR1220 lithium-ion battery. This circuit is responsible for maintaining the date and time settings while the CH-M does not have power. If the date and time settings reset after a power cycle, the CR1220 battery may need to be replaced.
Improper communication wiring, or exceeding the number of nodes on a single bus, can cause communication between the hub and detectors to be inconsistent. The CH-M uses Modbus RTU over RS-485 for communication. All standard guidelines apply for this type of wiring.
situation in which the target gas concentration becomes dangerous, or the area contains too much smoke from engine exhaust. Again, adjust the setting to a level that produces the best overall operation. Be sure to check all applicable federal, state, and local guidelines as these may dictate the required concentration.
Systemair strongly recommends that the control hub be grounded according to applicable wiring codes. However, if this is not possible, using a stylus or otherwise ensuring that the touch input is at the same potential as the floating ground will improve touch accuracy and responsiveness.
Upon receipt by Systemair of your written concern, you will be notified of our receipt as to the review process to manage the specific claim. If deemed a manufacturing defect and Systemair determines that you are entitled to a warranty claim, a resolution will be provided and a RMA Number shall be issued for reference on all communications.
Models and Descriptions Detector Model and Description Each Systemair Remote Detector is given a model that describes the type(s) of target gas(es). This model appears on the front hub label. Use the following list to completely identify a detector once you know the model.
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