Greenheck PVe (472846) - Manual (Page 19)

19 Model PVe Heat Recovery Unit
Routine Maintenance
Overview
The unit 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 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 psi. Do not force sharp objects
against the heat transfer surfaces or damage to the flat
plates may occur.
DANGER
Electric shock hazard. Can cause injury or death.
Before attempting to perform any service or
maintenance, turn the electrical power to unit to OFF
at disconnect switch(es). Unit may have multiple
power supplies.
CAUTION
Use caution when removing access panels or other
unit components, especially while standing on a
ladder or other potentially unsteady base. Access
panels and unit components can be heavy and
serious injury may occur.
Once the unit has been put into operation, a routine
maintenance program should be set up to preserve
reliability and performance. Items to be included in this
program are:
Lubrication
Apply lubrication where required
Dampers
Check for unobstructed operation
Fan Belts
Check for wear, tension, alignment
Motors
Check for cleanliness
Blower Wheel & Fasteners
Check for cleanliness
Check all fasteners for tightness
Check for fatigue, corrosion, wear
Bearings
Check for cleanliness
Check set screws for tightness
Lubricate as required
External Filter
Check for cleanliness - clean if required
Internal Filter
Check for cleanliness - replace if required
Door Seal
Check if intact and pliable