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SCXG-SVX01B-EN 49
pre-startup
requirements
Constant Volume Zone Sensor
BAYSENS019 Description
This seven day programmable sensor
with night setback has four periods for
occupied\unoccupied programming per
day. If power is interrupted, the program
retains in permanent memory. If power is
off longer than two hours, only the clock
and day may have to be reset.
The six programming keys on the front of
the zone sensor allow selection of system
modes (heat, cool, auto, and off), two fan
modes (on and auto). The zone sensor
has dual temperature selection with
programmable start time capability.
The occupied cooling setpoint range is 40
to 80°F. The warmup setpoint range is 50
to 90°F with a 2° deadband. The
unoccupied cooling setpoint range is 45 to
98°F. The heating setpoint range is 43 to
96°F.
Two liquid crystal displays (LCD) display
zone temperature, setpoints, week day,
time, and operational mode symbols.
The DIP switches on the subbase enable
or disable applicable functions; i.e.
morning warmup, economizer minimum
CFM override during unoccupied status,
Fahrenheit or Centigrade, supply air
tempering, remote zone temperature
sensor, 12/24 hour time display, smart
fan, and computed recovery.
During an occupied period, an auxiliary
relay rated for 1.25 amps @ 30 volts AC
with one set of single pole double throw
contacts activates.
Figure I-PR-16. BAYSENS019, program-
mable night setback sensor, accessory
model number digit 6 = G
Variable Air Volume Zone Sensor
BAYSENS020B Description
This seven day programmable sensor
with night setback has four periods for
occupied\unoccupied programming per
day. Either one or all four periods can be
programmed. If power is interrupted, the
program retains in permanent memory. If
power is off longer than twohours, only
the clock and day may have to be reset.
The zone sensor keypad allows you to
select occupied/unoccupied periods with
two temperature inputs (cooling supply
air temperature and heating warmup
temperature) per occupied period. The
occupied cooling setpoint ranges be-
tween 40 and 80°F. The warmup setpoint
ranges between 50 and 90°F with a 2°
deadband. The unoccupied cooling
setpoint ranges between 45 and 98°F.
The heating setpoint ranges between 43
and 96°F.
The liquid crystal display (LCD) displays
zone temperature, setpoints, week day,
time, and operational mode symbols.
The DIP switches on the subbase enable
or disable applicable functions; i.e.
morning warmup, economizer minimum
position override during unoccupied
status, heat installed, remote zone
temperature sensor, 12/24 hour time
display, and daytime warmup. During an
occupied period, an auxiliary relay rated
for 1.25 amps @ 30 volts AC with one set
of single pole double throw contacts
activates.
Figure I-PR-17. BAYSENS020, program-
mable night-setback sensor,
accessory model number digit 6 = J
Programmable Zone Sensors
Programmable zone sensors provide
programming and zone temperature
sensing for the self-contained unit. It
allows the user to monitor room
temperatures and program settings in
the space, without having to access the
unit control panel.
Reference programming instructions for
these zone sensors beginning on page 44.
Installation