Greenheck Fan HEAT RECOVERY UNIT WITH EVAPORATIVE COOLING HRE-20 - Manual (Page 24)

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Vapor Tight Lights
Vapor tight lights provide light to each of the compartments
in the energy recovery unit . The lights are wired to a switch
mounted on the outside of the unit . The switch requires
a separate power source to allow for power to the lights
when the unit main disconnect is off for servicing .
OPTIONAL ACCESSORIES
Service Outlet
120 VAC GFCI service outlet ships loose for field
installation . Requires separate power source so power
is available when unit main disconnect is turned off for
servicing .
CO2 Sensor
This accessory is often used to provide a modulating control signal to a variable frequency drive to raise and
lower airflow in relationship to the CO2 levels in the space . This strategy is often referred to as Demand Control
Ventilation and provides further energy savings to the system . Follow instructions supplied with sensor for
installation and wiring details .