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ROOFTOP UNIT CONTROL SYSTEM
Figure 6 shows a typical packaged rooftop VAV system
similar to the pervious system but with humidification and
without a return fan. Differential pressure mixed air control is
well suited to roof top applications which usually do not have
sufficient ductwork for flow station outdoor air measurement.
Without the return fan and with a two position exhaust fan it
is difficult to ensure air balance in the building.
EA
OA
STATIC
OA
OA
PRESSURE
TEMPER-
DAMPER
ATURE
RETURN
AND RELIEF
DAMPER
ENGINEERING MANUAL OF AUTOMATIC CONTROL
OPERATOR INTERFACE
distributed direct digital controllers and personnel computer based
local area networks are installed in many buildings. Full utilization
of a BMS greatly simplifies the operations and maintenance tasks
and provides prompt alert of IAQ problems. By furnishing quality
of information knowledgeable operators and engineers can easily
visualize the system, comprehend the current status, and determine
the nature of any problem.
RA
TEMPERATURE
MA
HEATING
COOLING
SA
TEMPER-
STAGE
VALVE
FAN
ATURE
Fig. 6. Typical Rooftop HVAC System.
167
INDOOR AIR QUALITY FUNDAMENTALS
Modern Building Management Systems (BMS) utilizing
RA
SUPPLY FAN
CT
HUMIDIFIER
SA
VALVE
RELATIVE
HUMIDITY
SA FAN
SA
STATUS
TEMPER-
ATURE
EXHAUST FAN
EXHAUST
FAN
STATUS
SA
SA
ROOM
AFTER
PRESSURE
TEMPER-
HOURS
ATURE
M10488
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