Build Equinox CERV2-6EC, Installation Manuals

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Revision 0.1 [05/10/18] Page 22
Wired Auxiliary Output Example – Inline Duct Heater (wiring)
The CERV2 can control electric heaters in two ways; dry contact, where the heater is suppling a 24V signal, or
24V signal where the CERV is directly supplying the 24V control signal. Installation should only be performed
by a trained professional. Turn power off to CERV2 and unplug or turn off breaker before performing any
wiring. Incorrect wiring can damage components and void warranties.
Please review your electric heater’s
installation instructions carefully to see which heater control applies. Schematics below show the wiring
configurations for the two cases. In either case, low voltage control wire can be used such as standard 2
conductor thermostat wire.
For the dry contact connec tion, 24V from the heater is connected to terminal 2 on the CERV2’s output
channel. Terminal 1 is then wired back to the heater. When the CERV2 activates the heater the relay will close
the connection between terminals 1 and 2 allowing the 24V signal to go back to the heater control to activate
it.
For the 24VAC signal control connection, a jumper is needed between CERV2 terminals 2 and 4. Terminal 4 is a
24VAC output channel. The control wires from the heater then connect to terminals 1 and 5. To activate the
heater the CERV will activate a relay to close the connection between terminals 1 and 2. This allows 24VAC to
pass through to the heater’s controls to activate heat.
After making the wiring connections, see next section to configure heater on CERV2 controller.