Greenheck Fan VSU Make-Up Air Unit with Direct-Fired Gas Heater 470654 - Manual (Page 5)

5 Model VSU Make-Up Air
®
Burner, Blower and Control Center Section
The burner section, blower section and control center
of the unit are all combined into one assembly which
is installed in the field on top of the filter and stand
section. The burner section is the lowest part of the
burner / blower unit and it sits directly on the filter
assembly. The burner section contains the gas train
with its own access door and directly above that is
the control center door. A number of different options
are available for the gas train, whick include type, size
and location of burners and many different ignition and
safety controls. The blower section of the unit consists of one motor and
either one or two forward curved blowers. It is the top-
most assembly in the unit. If two blowers are used, their
drive shafts are connected and driven by a single motor.
Supply air discharge openings may be located either on
the side wall of the unit for horizontal discharge, or may
be configured for upblast discharge through the roof of
the unit. One large access door is located directly above
the control center, for inspection and maintenance of
the motor and blower(s).
Open View
Burner
Blowers
Control Center/
Gas Train
Filters