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HE-Series Indoor
ERV
OPERATION
7.0 UNIT MAINTENANCE
7.1 MAINTENANCE 24 HRS. AFTER START-UP
RenewAire ERVs are built to operate with minimal maintenance. After unit commissioning, the
primary areas of attention are the air filters, periodic lubrication of the fan motors and annual
vacuuming of the enthalpic cores.
24 hours after unit start-up:
u
Readjust the tension on the motor drive belts.
u
In new installations, check the air filters since they will often collect dust, dirt and debris at
the time of start-up.
7.2 MAINTENANCE 30 DAYS AFTER START-UP
After 30 days of operation:
u
Tighten all electrical connections, paying special attention to VFD wiring (if present).
u
Readjust the tension on motor drive belts.
u
Check the air filters as part of the normal monthly maintenance.
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.
7.4 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 in-
spected 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.
Danger of injury if unit
starts unexpectedly.
Switch power off at service
disconnect. Lock-out/tag-
out the disconnect.
WARNING
Danger of Electrical
Shock when servicing an
installed unit.
ALWAYS DISCONNECT
POWER SOURCE BEFORE
SERVICING! More than one
disconnect switch may be
required.
Proper Wiring Size Selec-
tion and Wiring Installation
are the Responsibility of
the Electrical Contractor.
WARNING
7.5 FAN MOTORS
The most important issues in motor maintenance are:
u
Belt condition and belt tension
u
Sheave condition
u
Motor cleanliness
u
Motor lubrication
7.5.1 Belt Tension
Premature or frequent belt failures can be caused by improper belt tension (either too loose or too
tight) or misaligned sheaves. Abnormally high belt tension or drive misalignment will cause excessive
bearing loads and may result in failure of the fan and/or motor bearings. Conversely, loose belts will
cause squealing on start-up, excessive belt flutter, slippage and overheated sheaves. Both loose and
tight belts can cause fan vibration.