Daikin VAM-FA8VE Technical Data Manual page 256

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• HRV • VKM-GA(M)V1
Table 7 Effect of Carbon Dioxide (CO
Concentration (%)
0.03(0.04) Standard atmosphere
0.04~0.06 Urban atmosphere
Allowable concentration for many persons
0.07
staying in a room
Allowable concentration for general cases:
0.10 adopted by the Building Standard Act and
Building Control Act
Allowable concentration for ventilation
0.15
calculation
0.2~0.5 Worse result
0.5 or larger Worst result
0.5 Long-term safety limit (US Labor Health) ACGIH, Labor Office Rule
2 30% increase in breathing depth and air amount inhaled
Lower working performance, change in physiological functions, and twice larger
3
number of breaths
4 Concentration for normal breathing
Stimulates the respiratory center for taking a deeper breath and increasing the
4~5 number of breaths ; longer breathing time is a sign of danger ; O
raise the possibility of physical disorder outbreak earlier than usual
10-minute breathing will result in serious difficulty in breathing, hectic cheeks and
8
headache ; O
18 and larger Lethal
Sulfurous acid gas
Volcano exhaust, automobile exhaust or oil fuel-combusted gas and mist contain sulfurous acid gases in
the form of being adhered or absorbed onto suspended dust particles. These gases are a possible cause of
chronic bronchitis or other respiratory diseases.
Nitrogen oxides
Nitrogen oxides (NOx) include NO, NO
and account for large portions of NOx compounds. NO
part of the lung, and adversely affect it and other organs. In terms of long-term adverse effect, NOx is
stronger than sulfurous acid gases. Dusts can enhance the adverse effect of NOx gases.
NO (nitrogen monoxide) is also harmful, though its chronic effect is yet to be clarified.
•
NO produced by other than combustion
2
Oil heaters and gas ovens for oxygen-based combustion produce a large amount of NO
ovens also produce NO gases though their amount is smaller, and this is not well-known. That is, high
2
temperatures, regardless of combustion, facilitate bonding between N and O atoms in the air, which results
in the increase in the amount of NO
requires ventilation.
<NO safety limit = 0.04 ppm~0.06 ppm>
2
Table 8 Effect of SO on Human Body
2
Concentration (%)
1 Feel of slight oppression in the chest
3~5 Feel odor
7~12 Stimulant odor
20~40 Significant stimulation, eye irritation and coughing
100~200 Bronchitis and significant stimulation in the chest; and lung disorder
300 Impossible to breath
400 Difficulty in breathing
500 Impossible to breath
Oxygen starvation
About 21% of O concentration is normal for human body. Lower O
2
breathing with other various symptoms. O
concentration will cause our pulse rate to increase, which leads to larger burdens on the heart. Abnormally
higher O concentrations invite another danger : higher ignition possibilities. Therefore, artificial oxygen
2
supplies should be avoided. The most effective way for avoiding oxygen starvation is to supply natural air
that contains oxygen concentrations appropriate for human life.
• HRV • Heat Reclaim Ventilation
)
2
Effect of change in concentration
starvation will enhance the possibility of this disorder
2
, NO , N O, N O and N O
2 3 2 2 3 2
(nitrogen dioxide) can easily reach the deepest
2
. Continual generation of high temperatures in an enclosed space thus
2
Effect of change in concentration
concentration of 8% or lower will have a fatal effect. Higher O
2
These concentration limits are
defined as a pollution indicator
within a hypothesis that the
physical and scientific
properties of the air will
become worse with the
increase in the concentration
of CO , not based on its own
2
harmfulness.
starvation will
2
. Of these, NO and NO are harmful
4 2
gases. Electric
2
concentration will cause difficulty in
2
2