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INSTALLATION
MAXA-MI$ER™
UNITARY ENERGY RECOVERY VENTILATOR
INSTRUCTIONS
MODEL VR036A15H/25H & VR046A15H/25H
& VR062A15M/H/25M/H (STATIONARY)
VIII -
Operation
FIELD HARNESS
How It Works
The unit contains an Energy Recovery Wheel that is a new
concept in rotary air-to-air heat exchangers. Designed as a
packaged unit for ease of installation and maintenance,
only matching up to rooftop unit with an internal balancing
damper and 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 media is permanently bonded
with a dry desiccant coating for total enthalpy recovery.
The wheel is belt driven by one motor and drive belt.
When slowly rotating through counter flowing exhaust and
fresh air streams the UERV absorbs sensible heat and
latent heat from the warmer air stream and transfer this
total energy to the cooler air stream during the second half
Figure 7
of its rotating cycle. Rotating between 50-60 revolutions
per minute, 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 UERV transfers
moisture entirely in the vapor phase. This eliminates wet
PLATFORM SUPPORT RAIL
surfaces that retain dust and promote fungal growth as well
as the need for a condensate pan and drain to carry water.
Figure 8
Because it is constantly rotating when in the air stream, the
UERV is always being cleared by air, first in one direction
DOOR PANELS
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.
During the heating season, when outdoor air temperatures
o
are below 15
F, it is recommended to use the (optional)
low ambient kit.
Optional Low Ambient kit is appropriate for climates with
l im i ted H VAC syste m o pe ra tio n wh en ou tdoor
o
temperatures are below 15
F.
The frost threshold is the outdoor temperature at which
frost will begin to form on the UERV wheel. For energy
recovery ventilators, the frost threshold is typically below
o
10
F. Frost threshold is dependent on indoor temperature
and humidity. The table shows how the frost threshold
¾ x 1 ¼ GASKET
temperatures vary depending on indoor conditions.
Figure 9
PAGE 4
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