Second Wind 5036SL Service Manual

SBS is a catch-all term that refers to a series of
complaints for which there is no obvious cause and
where medical tests reveal no particular abnormalities.
The symptoms display when individuals are in the
building but disappear when they leave. Complaints may
include irritation of the eyes, nose and throat; headache;
stuffy nose; lethargy, and skin irritation. Without a quick
resolution, increased absenteeism, reduced work
efficiency, and deteriorating employee morale are likely
outcomes of SBS.
BRI refers to a defined illness with a known causative
agent resulting from exposure to building air. While the
causative agent can be chemical (e.g. formaldehyde), it
is often biological. Typical sources of biological
contaminants are humidification systems, cooling
towers, drain pans and filters, or water damaged
material. Symptoms may be specific or mimic symptoms
associated with the flu. Serious lung and respiratory
conditions can occur.
MCS is a person that has sensitivity to particular agents
at levels that do not have an observable affect on the
general population. Persons having MCS apparently
have difficulty being in most buildings. Building
managers may encounter occupants who have been
diagnosed with MCS.
As pollutants inside travel through the building from
areas of high pressure to areas of lower pressure. Some
of these pathways are planned and deliberate, for
example building ventilation systems (HVAC Systems).
Just as an HVAC system can introduce a contaminate to
an occupied space, it can also remove it. The factors
most important to understanding indoor pollution are a)
indoor sources of pollution, b) outdoor sources of
pollution, c) ventilation parameters, airflow patterns and
pressure relationships, e) air filtration systems, f)
Ultraviolet Germicidal Irradiation Systems, and g) Gas
Phase (VOC) Removal Systems.
Second wind industrial air purifiers have years of
experience with Ultraviolet Germicidal Irradiation and
Gas Phase Removal Systems manufacturing. Second
wind systems offer the highest intensity ultraviolet
irradiation, while also reducing gas phase contamination
through the introduction of Photo-catalytic oxidation.

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The ultraviolet (UV) component of sunlight is the main
reason microbes die in outdoor air. The use of ultraviolet
germicidal light for sterilization of micro-organisms has
been studied since the 1930’s. Microbes are vulnerable
to the effects of light at the wavelengths at or near 253.7
nm. At that wavelength ultraviolet light has the right
amount of energy to break bonds or genetically damage
microorganisms. Ultraviolet systems have much more
concentrated levels of ultraviolet energy than are found
in sunlight.

Properly designed UV system installations have proven
highly effective in hospitals, schools, etc.
Second Wind ultraviolet germicidal lamps are 253.7 nm
of light, optimal for air and surface disinfection. All
microorganisms are susceptible to ultraviolet germicidal
light at different rate constants.

In order to precisely design a system for protection against indoor air quality concerns, it is necessary
to establish performance criteria. The average intensity multiplied by the exposure time will yield the
dose. The dose can then be used to predict the kill rate of any microbe for which the ultraviolet
germicidal rate constant is known. The average intensity is, therefore, the single defining
characteristic of a ultraviolet germicidal irradiation system (UVGI). The concept of a UVGI rating
value, or URV, has been introduced to define the range of average intensities that are typical in
UVGI air-disinfection systems. The URV is analogous to the ASHRAE 52.2-1999 MERV system of
rating filters and can be used in complementary fashion to design combined UVGI and filtration
systems. A single track of 5036DL second wind units at 6 inch spacing (3040 uW/cm2), 400 fpm,
would be a URV 14 (Out of scale low 1-15 high) with a kill rate of TB bacilli of 80%.
W.J.Kowalski “Immune Building Systems Technology” p.197

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Second Wind commercial air purifiers have the only commercially available systems that

incorporates ultraviolet germicidal light and Photo-catalytic oxidation (PCO).

Second Wind uses a metal catalyst of Titanium to
create the PCO process. Titanium naturally has a very
thin later of of oxidized film on it called Titanium
oxide (TiO2). The TiO2 film has a high refraction ratio
and when it is irradiated with UV light, less than 385
nm, the band gap energy (the level of energy photons
needed to be able to free electrons from their atomic
bonds is exceeded. What is created are electron /hole
pairs, hydroxyl radicals (OH), thus attracting
molecules (such as volatile organic compounds VOC's
or bioaerosols) to the catalyst (Titanium).

The volatile organic compounds
are oxidized by a reaction that
takes place during this process due
to the fact that the OH radicals
need to attach themselves to
something, and the contaminate is
absorbed at the catalyst surface.
PCO will also kill and decompose
any of the absorbed bioaerosols.

As shown in Fig.1

“One effective method to destroy dilute concentrations of organic and chlorinated organic pollutants
in air is heterogeneous photocatalytic oxidation (PCO), which uses a semiconductor catalyst such as
TiO2 and near-UV radiation to decompose contaminates...” “The large number and variety of
chemicals successfully treated by PCO indicates potentially broad range of application.”

John L. Falconer, Ph.D. Professor of Chemical Engineering University of Colorado

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Ph.D. (Chemical Engineering), Stanford University (1974)

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B.E.S. (Chemical Engineering), The Johns Hopkins University (1967)

“... Potential applications for using titania-based materials as photocatalysts include...Destroying
volatile organic compounds (trchloroethylene, benzene, formaldehyde, etc.). Reducing air pollution
in homes and industries such as dry-cleaners, painting booths, and printers..”

Marc A. Anderson Professor Water Chemistry Program and Materials Science
University of Wisconsin, Madison

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Second Wind commercial air purifiers have the only commercially available systems that

incorporates ultraviolet germicidal light and Photo-catalytic oxidation (PCO).

“Photocatalysts for the destruction of indoor air pollutants, including VOC’s and gaseous inorganic pollutants
such as nitrous oxides, carbon monoxide, and hydrogen cyanide...(Heller,1996). “Reports of tests show the
technology capable of rapidly destroying toxic components of tobacco smoke such as formaldehyde, acrolein
and benzene.”

Taken from the American Lung Association webpage January 24, 2001

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