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OPTIONAL EXHAUST FAN CONTROL:
The HHSC+ may optionally control an exhaust fan (not included) using the AUXC and AUXO auxiliary
output terminals (wiring to thermostat and HVAC unit not shown for clarity) on the base. Connect the
terminals to a 24 VAC relay (not included, 1A max. current) to control a 120 VAC exhaust fan. Whenever
ventilation is occurring (the FAD damper is opened), these terminals will be energized and the fan relay
will activate the exhaust fan to work in conjunction with the Healthy Home System to provide balanced
ventilation. At other times, the exhaust fan may be locally controlled by a wall switch or timer wired in
parallel with the relay.
These terminals may also be used as 24 VAC input to control a device having 24 VAC control terminals
(max. 1A current).
OPTIONAL REMOTE OVERRIDE CONTROLS:
The HHSC+ may be remotely controlled by optional override device(s); see the Activation by Remote
(Override) Device(s) section under Operation.
OPTIONAL OUTDOOR THERMOSTAT AND/OR HUMIDISTAT (not included):
The FAD damper blue wire may be wired in series with an outdoor thermostat and/or humidistat, to prevent
ventilation if outdoor conditions are extreme. Note: the Damper Monitor feature must be disabled if this
option is installed; see Damper Monitor feature in Setup.
Figure 5 Outdoor Thermostat/Humidistat
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