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Single Zone Air Conditioning System-A packaged
system that includes heating, cooling, and air
distribution equipment. It might also include an
economizer (see Economizer). These systems are self-
contained. often roof mounted. and condition the air
in q specific local area v&h its own thermostat. Larger
buildings may have 2 or more areas or zones, each
with its own air conditioning system and thermostat.
Thermostat Cycle-The time necessary for the
heating or cooling equipment to come on, operate.
and turn and remain off until the next tir& it is
needed. Cycle time is controlled by thethermostat.
For example. mechanical cooling equipment might
turn on and then go off 4 times in an hour.
Unoccupied Temperature Set Point-The heating
and cooling temperature settings used when the
room or building is scheduled to be unoccupied.
Unoccupied Start Time-The selected time at which
the air conditioned space is allowed to become
cooler/warmer to save energy. NOTE: can be
temporarily overridden by using the “3-Hour Override”
key.
7-Day Program-Each day of the week (7 days) may
be individually scheduled for occupied or
unoccupied start times. This allows maximum
flexibility for building scheduling.
IF.
Heating will not come on. or
Cooling will not come on.
Then.
Wait for the minimum off-time delay of 2 to 4
minutes. Recall temperature set points to verify
correct settings.
No heating/cooling with blinking display of time or There will be no heating/cooling as the heating/
temperature. cooling system power is off. The backup battery is
maintaining the program schedule.
Too wcxm (cooling), or Recall the Occupied Start schedule to check for the
Too cool (heating). desired time. Also check the temperature set
points to verify correct settings.
Blinking display of 3 dashes (- -). Indicates loss of stored time and temperature
schedule. Check/replace the backup battery and
reenter time and temperature schedule.
Steady display of 3 dashes (- -) during pro- Indicates an Occupied or Unoccupied time that is
gramming. not programmed.
or..
If these steps do not solve your problem, call your building
maintenance supervisor or service technicjon.
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