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THE INTEGRATED HVAC SYSTEM
Many buildings have ceiling return air plenum as in Figure B. Fresh air from the HRV can be introduced directly
into the ceiling space, but this should occur near the air handler’s intake.
By operating the HRV on a 24 hour/7 day battery backed timer, the unit can be set to operate only when
occupancy or indoor conditions require the air exchange.
In installations where it is satisfactory to provide general exhaust from the space, the air to be exhausted may
be taken directly from the return air plenum to the HRV as it is drawn back to the air handler. Fresh air
supplied by the HRV is then introduced directly into the return air plenum but at a location closer to the air
handler. The air handler would have a constant running blower to effectively distribute the fresh air and
remove the stale air. Balancing dampers would be in both the HRV supply and exhaust ducts between the
return air plenum and the HRV.
At no time should the air handler Total External Static Pressure (TESP) on the return duct exceed that of
the HRV.
• When interlocking a rooftop unit with an ERV take care to ensure the fans of both units operate in the
correct rotation.
Note: Example configuration only.
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