Greenheck Fan PVE-35 - Manual (Page 22)

22 Model PVe Heat Recovery Unit
Maintenance Overview
The Greenheck PVe Heat Recovery Ventilator is quite
simply an interface unit that takes in outdoor air and
either heats or cools that air and then delivers that air
into the building HVAC system for further heating or
cooling. The heating and cooling that is done in this
unit is accomplished by taking heat energy out of the
air being exhausted to the outdoors and transferring
that heat energy to the incoming replacement air. If
the outdoor air is being used for cooling, some of the
heat energy is transferred from the incoming warm
outdoor air to the exhaust air.
Most all the components found in this unit are typical
of what would normally be found in other air handlers.
There is an air propulsion system consisting of
two belt driven blowers; one to draw in outdoor air
through the Plate Heat Exchanger, and the other to
draw stale indoor air from the building through the
Plate Heat Exchanger and then exhaust it. There are
various optional motorized dampers and sensors that
may also be found in the unit.
The heart of the PVe unit is the Plate Heat Exchanger
and this is the component that actually accomplishes
heat energy recovery. It has no moving parts and the
only real maintenance issues are to keep the internal
surfaces clean and to protect the aluminum plates
from damage.
In addition to the typical maintenance issues shown
in following pages, periodic visual inspection of
the Plate Heat Exchanger is required. Such visual
inspections should be recorded and record made of
any observations.
The surfaces of the flat aluminum plates within
the Plate Heat Exchanger permit complete visual
inspection of both supply and exhaust sides of the
unit. Small amounts of dust present in either side of
the Plate Heat Exchanger will not affect performance.
If appreciable amounts of dust or dirt accumulate,
the Plate Heat Exchanger can be cleaned with hot
water (180ºF) or a detergent that does not damage
aluminum surfaces. Spray water evenly across the
surfaces at a pressure between 22 and 55 psig. Do
not force sharp objects against the heat transfer
surfaces or damage to the flat plates may occur.