A simple comparison is provided below.  To better understand the differences, refer to the details of the most recent example.


Features of Computerized Temperature Control (CTC)

vs

Energy Management Systems (EMS)/Direct Digital Control (DDC)

 

  SBD-2590
SBD-1001
"CTC"
NET-8000
"EMS"
"DDC"
W-7040
"EMS"
"DDC"
AC-256
"EMS"
"DDC"
Control Interlock of all heating and air conditioning equipment Yes No No No
Timed base night setback Yes Yes Yes Yes
Seven day night setback program Yes Yes Yes Yes
Holiday scheduling Yes Yes Yes Yes
Night setback by large zones or complete facility Yes Yes Yes Yes
Night setback by individual zone or area Yes No No No
Recovery from night setback of entire facility as one zone using optimum Start-Stop No Yes Yes Yes
Recovery from night setback of facility by individual zone or area using Anticipatory Recovery program Yes No No No
Night temperature control by large zones or complete facility by one sensor No Yes Yes Yes
Night temperature control by individual zone or area Yes No No No
Capability of overriding night setback at central computer Yes Yes Yes Yes
Capability of overriding night setback in each zone or area Yes No No No
Occupied temperature control Yes No No No
Individual occupied temperatures set at central computer only Yes No No No
Freeze and Fire alarm functions Yes No No No
Demand limiting initiated by pulses from utility company meter Yes Yes Yes Yes
Demand limiting by duty cycling only No Yes Yes Yes
Demand limiting selects best case temperature control zone to limit Yes No No No
Records operating parameters of all mechanical equipment including all zone temperatures Yes No No No
Self test programs to check status of central computer and report problems Yes Yes Yes Yes
Self test programs and hardware to check status of all outboard hardware and report problems Yes No No No
Replaces existing night setback systems Yes Yes Yes Yes
Must repair all thermostats, sequencers, sensors, actuators, valves and contactors to insure proper operation of system No Yes Yes Yes
Replaces all existing tem0perature control equipment except actuators, valves, contactors and safeties Yes No No No
In occupied mode heating and air conditioning equipment operate based on outside air temperature No Yes Yes Yes
In occupied mode heating and air conditioning equipment operate only when required by individual zones and in coordinated interlocked modes Yes No No No
Changeover from heat to cooling performed automatically by computer Yes No No No
Long term maintenance contract recommended No Yes Yes Yes
 

 

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