PAGE 3
13. Attach Flexible Duct Collar to the MV fresh air intake
and secure with screws.
See Figure 6.
14. Attach fresh air intake duct work to fresh air intake
Flexible Duct Collar and secure with screws.
See
Figure 6.
15. Attach Flexible Duct Collar to return air intake and
secure with screws.
See Figure 6.
16. Attach return air intake duct work to return air intake
Flexible Duct Collar and secure with screws.
See
Figure 6.
FRESH AIR INTAKE
COVER PANEL
RE TURN AIR INTAKE
DUCT COLLAR
FRESH AIR IN TAKE
DUCT COL LAR
RE TURN AIR IN TAKE
COVER PANEL
Figure 5
Figure 6
FRESH AIR IN TAKE
DUCT WORK
RE TURN AIR INTAKE
DUCT WORK
RE TURN AIR INTAKE
FLEX I BLE DUCT COLLAR
FRESH AIR IN TAKE
FLEX I BLE DUCT COL LAR
VIII - Op er a tion
How It Works
The unit contains an Mini Ventilator that is a new concept in
a rotary air-to-air heat exchanger. Designed as a
packaged unit for ease of installation and maintenance,
only connection of electrical power is required to make the
system operational. The concept consists of a unique
rotary energy recovery wheel that rotates in and out of
fresh air streams within a heavy duty, permanently
installed blower cabinet that provides ready access to all
internal components. The Energy Recovery Wheel
contains spirally wound polymeric material that is coated
and permanently bonded with a silica gel desiccant for
transfer of sensible and latent heat. The wheel is belt
driven by one motor and stretch urethane perimeter drive
belt.
When slowly rotating through counter flowing exhaust and
intake air streams the MV adsorbs sensible heat and latent
heat from the warmer air stream and transfers this total
energy to the cooler air stream during the second half of its
rotating cycle. Rotating the wheel provides constant flow of
energy from warmer to cooler air stream. The large
energy transfer surface and laminar flow through the wheel
causes this constant flow of recovered energy to
represent up to 85% of the difference in total energy
contained within the two air streams.
Sensible and latent heat are the two components of total
heat. Sensible heat is energy contained in dry air and latent
heat is the energy contained within the moisture of the air.
The latent heat load from the outdoor fresh air on an air
conditioning system can often be two to three times that of
the sensible heat load and in the winter it is a significant
part of a humidification heat load.
During both the summer and winter, the MV transfers
moisture entirely in the vapor phase. This eliminates wet
surfaces that retain dust and promote fungal growth as well
as the need for a condensate pan and drain to carry water.
Because it is constantly rotating when in the air stream, the
MV is always being cleared by air, first in one direction
then the other. Because it is always dry, dust or other
particles impinging on the surface during one half cycle,
are readily removed during the next half cycle.
In the heating season, when outdoor air temperatures are
below 10
o
F, it is recommended to use the (optional) low
ambient kit (factory installed 02 models only). At these
conditions you will need to determine the frost threshold
parameters.
The frost threshold is the outdoor temperature at which
frost will begin to form on the MV wheel. For energy
recovery ventilators, the frost threshold is typically below
10
o
F. Frost threshold is dependent on indoor temperature
and humidity. The table shows how the frost threshold
temperatures vary depending on indoor conditions.
FROST THRESH OLD TEM PER A TURE
IN DOOR RH AT 70
o
F
FROST THRESH OLD
TEM PER A TURE
20%
0
o
F
30%
5
o
F
40%
10
o
F
