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L3ackupBattery-A bat& located in the 17400
thermostat that provides electricity to maintain your
time and temperature schedule during power loss. If
the battery is dead or runs down during o power
failure, the time and temperature schedule will be
lost. However. the thermostat will control to 11
standard Set of “default” set points when bower is
restored
Default Set Points-Temperature sewings of 458 F for
heating, 72 F for economizer. and 78 F for ccooling
that ore built into the T7400. These assure that the
system will remain operational even if the thermostat
is not programmed ‘or the time and temperature
schedules are lost due to battery failure.
Economizer-An auxiliary control system which
allows use of
COOI
outdwr air for “‘ke” Caling. in
place of eiectrical air conditioning equipment. The
T7400 has 2 cooling set points. economizer and
mechanical cooling. Based on the availability of
outdoor air for ‘free” cooling, the 77400 will control
at the lower economizer set point providing
increased comfort without the extra expense of
running mechanical cooling. Only if outdoor air
cannot or does not sufficiently cool the space will
mechanical cooling be allowed to run. and then
only at the higher mechanical cooling set point.
“Free” Cooling-See Economizer.
intelligent Recovery”-A control method which
,i adjuGs the heating warmup and cooling pulldown
Occupied Ti?mperoture Set Point-The heating,
time periods based on outside weather conditions.
economizer. and cooling temperature settings used
Commonly refered to OS “optimized start.”
when the room or building is scheduled to be
occupied.
Mechanical Cooling-Cooling that is provided by
-_
running compressors to extract heat from the
Occupied Start Time-The selected time at which the
conditioned space.
air conditioned space is to reach the comfort
temperature for people occupying the room.
Minimum ON/Oft Times-Fixed minimum on/off
equipment run times used to prevent harmful short
Set Point-The selected temperature at which the
cycling (turning on and off too often) which con
heating/cooling system is to maintain the
significantly reduce equipment life or cause
conditioned space. There ore separate set points for
permanent damage.
heating. economizer. and cooling in the OCCUPIED
and UNOCCUPIED time pefiods.
21


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