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Summary of Contents for Build Equinox CERV2
- Page 1 CERV2 I/O Expansion Board Manual Build Equinox support@buildequinox.com (773)-492-1893 Rev 1.2 - 12/03/2020 © Build Equinox 2020...
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Page 2: Specifications
Specifications The CERV2 I/O Expansion Board increases the number of available wired auxiliary connections on a CERV2 system by 3 input channels and 6 output channels. This provides a total of 4 input channels (I0, I1, I2, and I3) and 7 output channels (X0, X1, X2, X3, X4, X5, and X6) for connecting wired external auxiliary devices to a CERV2. - Page 3 I/O Expansion Board Access/Installation Before removing any access covers, power to the CERV2 should be turned off and the unit either unplugged or the electric breaker switched off. Remove the lower front plastic cover by removing the 13 phillips head screws shown below.
- Page 4 Press the standoffs into the holes to secure the board into place. o Connect the two cables between the I/O board and the CERV2’s main control board, which is located directly above the two orange damper motors.
- Page 5 I/O to work properly. Some example input and output configurations are shown as well. For more information on the settings and functionality of each I/O function type, see the manual for that particular device, the CERV2 Installation Manual, or the Touchscreen Controller Guide.
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- Page 8 Fan Interlock Wiring (Input) If the CERV is ducted along with another system, it may be desired for both system’s fans to operate simultaneously. This section indicates how to ensure that the CERV’s fans operate along with the connected system. Toggle switch for the channel should be moved to the EXTERNAL 24VAC SENSE setting.
- Page 9 Wired Switch (Input) A wired switch may be used to trigger ventilation (or any other input function) on the CERV. Toggle switch for the channel should be moved to the DRY CONTACT SENSE setting. Any number of switches maybe connected in parallel to a single input terminal.
- Page 10 Zone Damper Wiring (Output) Zone damper wiring requires 3 conductor wire capable of carrying 24VAC at 0.5A (thermostat wire is acceptable). The standard damper motor terminal block is three positions, with the first as a common, while the second and third activate the damper motor to turn clockwise or counterclockwise when voltage is applied.
- Page 11 Auxiliary Heater Wiring (Output) There are typically two configurations for Auxiliary Heater wiring – dry contact control, and 24VAC signal control. Consult the installation guide for the heater to determine which is applicable. Take note of the slide switch position for each configuration. WARNING: OUTPUT CHANNELS ARE RATED MAXIMUM 24VAC 0.5A.
- Page 12 Geo-Boost Wiring (Output) In order to control the Geo-Boost circulation pump via the I/O board, an external dry contact relay must be used with the pump’s power wiring. Recommended relay: OMRON G2R-1-T-AC24. Toggle switch for the channel should be moved to the 24VAC OUTPUT setting.
- Page 13 Fan Interlock Wiring (Output) If the CERV is ducted along with another system, it may be desired for both system’s fans to operate simultaneously. This section indicates how to ensure that the connected system’s fans operate along with the CERV. Toggle switch for the channel should be moved to the DRY CONTACT OUTPUT setting.
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