Barnstead International Thermolyne 859 Series, Руководство по обслуживанию

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of the NCAT provides a direct path for atmospheric air
pressure to enter the room/building when exhausted
directly through an outside wall or the roof. The NCAT
does have a 60CFM rated blower motor to aid the ventila-
tion process, but in some situations, the pressure differ-
ence is too great and the blower motor can not prevent or
stop the negative air pressure from occurring. Smoke
generated for the NCAT will fill the room and/or the lift test
will be low. This is a design issue in the buildings ventila-
tion system, not the fault of the NCAT. There are a cou-
ple of options if the NCAT is to be installed at this loca-
tion.
1. Open any doors or windows in the room. This
may be enough to offset the pressure differ-
ences, allowing the NCAT to be operated prop-
erly.
2. Install a second blower motor in-line with the
ventilation tubing from the NCAT. The second
blower motor must be installed no closer than
10 feet from the unit. Barnstead/Thermolyne
does not offer a selection of blower motors for
this purpose and a motor would have to be pur-
chased locally.
3. Checking the buildings ventilation system. This
is would require consulting a HVAC technician.
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