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EV-Series Indoor
ERV
MAINTENANCE
7.4 FILTERS
Inspection and replacement of air filters is the most frequent maintenance issue. For units that
do not have filter air pressure differential sensors, filters must be visually inspected monthly, as
a minimum. If a filter looks discolored or dirty, REPLACE IT! When installing new filters, DO NOT
USE filter sprays. Residue from the filter spray could migrate to the enthalpic core media and
damage the cores.
For units that have filter air pressure differential sensors, a dirty filter alarm will occur on the
connected alarm or control device.
Filter cleanliness and replacement is the most important and frequent maintenance issue. Dirty
filters will cause an immediate reduction in operating efficiency of the ERV. Normally, filters
should be inspected and changed when they are dirty. Paper filters are not to be cleaned, they
are to be replaced.
In general, if a filter looks dirty, replace it. The best indication of dirty filters is to check the
pressure drop across the filter banks with an optional filter monitor. If it is not possible to check
the pressure drop, the rule of thumb would be to change the filters every two months.
7.0 MAINTENANCE
Danger of injury from un-guarded blower in unit. Disconnect power to unit before opening
door. Danger of injury if unit starts unexpectedly. Switch power off at service disconnect.
Lock-out/tag-out the disconnect.
WARNING
RenewAire ERVs are built to operate with minimal maintenance. After unit commissioning, the
primary areas of attention are the air filters and annual vacuuming of the enthalpic cores. See
section 5.2 if doors need to be removed for servicing.
7.3 MAINTENANCE SCHEDULE
Experience on the part of the service person is the most important issue in establishing a
maintenance schedule. There will be times of the year when frequent inspection of the filters
will be required, such as spring and summer when there may be pollen, dust, dirt or debris from
budding trees and bushes that can clog the filters. Also see Section 7.7 Maintenance Records in
this manual.
7.1 MAINTENANCE 24 HRS. AFTER START-UP
24 hours after unit start-up:
u
In new installations, check the air filters since they will often collect dust, dirt and debris at
time of start-up.
7.2 MAINTENANCE 30 DAYS AFTER START-UP
After 30 days of operation:
u
Tighten all electrical connections.
u
Check the air filters as part of the normal monthly maintenance.
6.6 EXTREME COLD OPERATION
EV450IN units are capable of operating without internal frosting at temperatures down to
-10°F, with indoor humidity below 40%. The units can operate under more severe conditions
occasionally with little or no impact on their performance. At lower humidities, they can operate
at still lower outside temperatures without freezing the enthalpic cores.
Some condensation or even frost may form on the outside of the unit or drip off the cabinet
during very cold conditions, especially if the unit runs continuously. Exterior condensation
during extreme cold conditions can be reduced or prevented by periodically cycling the unit OFF
for several minutes to allow the cabinet to warm up.
