Specifications

VCES-ERV-IOM-1A – ERV500i/e
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Flow control dampers should be installed downstream
from the FMS so flow through the FMS is not disturbed.
Dampers can then be adjusted to equalize flow rates in
the ducts.
Setting Flow Rate
Flow rates should be balanced with units operating on
high speed. A damper must be used to establish the mini-
mum duct pressure required so fans do not operate in
overload regions. Set the dampers to establish the mini-
mum duct pressure required. Further adjust the dampers
to reduce flow to the desired, balanced rate.
Airflow performance can be measured using flow measur-
ing stations (FMS) as described above or performing air
flow measurements using ASHRAE suggested methods.
Where space is limited in the outdoor air or exhaust air
ducts, pressure drop readings can be taken across the
enthalpy wheel rotor and extrapolated from Table 2. Heat
recovery performance is tested in accordance to AHRI
Standard 1060 and is accurate to within +/− 5% if there is
no dirt buildup in the heat recovery wheel.
Table 2: ERV500i/e Enthalpy Wheel Airflow vs. Velocity
and Pressure Drop
Airflow (cfm) Velocity (fpm) Pressure Drop (in. w.g.)
300 417 0.45
400 556 0.60
500 695 0.76
600 834 0.93
700 973 1.10
Quarterly maintenance (every three months) should include:
Air Filters
The standard medium efficiency filters are disposable and
should be replaced every three months. More frequent re-
placement may be required under extremely dirty operat-
ing conditions. For filter specifications, see Appendix F.
Cassette Panels and Interior of Unit
The foil faced insulation surfaces and cassette panels
should be wiped clean with a soft cloth and mild cleaning
solution.
Annual maintenance should include:
Air Filters
Replace medium efficiency filters.
Interior of Unit
Wash the foil faced insulation surfaces with a soft cloth
and mild cleaning solution.
Enthalpy Wheel
No cleaning of the enthalpy wheel is required, it is self-
cleaning due to the opposing airflows. If the enthalpy
wheel needs to be cleaned, use low pressure air or a
vacuum. Wash the cassette panels with a soft cloth and
mild cleaning solution. Visually inspect the cassette brush
seals (shown in Figure 4), perimeter seal and drive belt for
proper operation.
Fans
The blower wheels and fan housing should be checked
for dirt build-up. If they are dirty, it will be necessary to
remove the blower assembly to clean the dust out through
the fan mouth.
System Operation Check
Verification of all control modes should be checked to en-
sure proper operation. Refer to Start-up Section.
System Service
Quarterly Maintenance
Annual Maintenance
WARNING
Disconnect the main power switch to the unit before per-
forming service and maintenance procedures.
!
Rotor
Brush seal
Figure 4: Brush seal