ED 15103-6 • MICROTECH III WSHP UNIT CONTROLLER 58 www.DaikinApplied.com
spaCe TemperaTure seTpoInT meThods
spaCe TemperaTure seTpoInT meThods
This section details the calculations used for setting space
temperature setpoints. The calculations depend on unit
status (if it is occupied, unoccupied, or in standby mode)
and whether a local or long range setpoint adjust is enabled.
BACnet and LonWorks methods are the shown separately.
A space temperature setpoint operation diagram illustrates
the relationship among the inputs and their default values
(Figure 2). The last section includes examples of common
applications using default values.
Table 29 is the set of default values for each parameter. Refer
to these defaults for the example applications (Table 30).
Setpoint Methods - BACnet
NOTE: All calculations shown in 1-5 below apply to Stage #1
heating/cooling.
1. The unit is operating in Unoccupied mode.
• EffCoolOnSP = AV3
• EffCoolOffSP = (EffCoolOnSP – AV17)
• EffHeatOnSP = AV6
• EffHeatOffSP = (EffHeatOnSP + AV17)
2. The unit is operating in Occupied or Standby mode
with Local Setpoint Adjust disabled by MSV14=1.
This calculation then depends on whether or not there
is a valid AV19 value. The DeadBandFactor used in this
calculation is shown here for both Occupied and Standby
modes (and applies to both a valid and invalid AV19
value):
Occupied: DeadBandFactor = ((AV1 – AV4) / 2)
Standby: DeadBandFactor = ((AV2 – AV5) / 2)
Valid AV19 value:
• ReferenceSP = (AV19 + AV35)
• EffCoolOnSP = (ReferenceSP + DeadBandFactor)
• EffCoolOffSP = (EffCoolOnSP – AV10)
• EffHeatOnSP = (ReferenceSP – DeadBandFactor)
• EffHeatOffSP = (EffHeatOnSP + AV10)
Invalid AV19 value: (Analog Null)
The Reference setpoint used in this calculation is shown here
for both Occupied and Standby modes:
Occupied: ReferenceSP = (AV1 – DeadBandFactor +
AV35)
Standby: ReferenceSP = (AV2 – DeadBandFactor +
AV35)
• EffCoolOnSP = (ReferenceSP + DeadBandFactor)
• EffCoolOffSP = (EffCoolOnSP – AV10)
• EffHeatOnSP = (ReferenceSP – DeadBandFactor)
• EffHeatOffSP = (EffHeatOnSP + AV10)
3. The unit is operating In Occupied or Standby mode
with Long Range Local Setpoint Adjust selected and
MSV14=2. The DeadBandFactor used in this calculation
is shown here for both Occupied and Standby modes.
Occupied: DeadBandFactor = ((AV1 – AV4) / 2)
Standby: DeadBandFactor = ((AV2 – AV5) / 2)
• ReferenceSP = AI5
• EffCoolOnSP = (ReferenceSP + DeadBandFactor)
• EffCoolOffSP = (EffCoolOnSP – AV10)
• EffHeatOnSP = (ReferenceSP – DeadBandFactor)
• EffHeatOffSP = (EffHeatOnSP + AV10)
4. The unit is operating in Occupied mode with Short
Range Local Setpoint Adjust selected and MSV14=2.
• EffCoolOnSP = (AV1 + AV24)
• EffCoolOffSP = (EffCoolOnSP – AV10)
• EffHeatOnSP = (AV4 + AV24)
• EffHeatOffSP = (EffHeatOnSP + AV10)
5. The unit is operating in Standby mode with Short
Range Local Setpoint Adjust selected and MSV14=2.
• EffCoolOnSP (HP0, HP1)
1
= (AV2 + AV25)
• EffCoolOnSP (HP2, HP3)
1
= (AV2 + AV24)
• EffCoolOffSP = (EffCoolOnSP – AV10)
• EffHeatOnSP = (AV5 + AV24)
• EffHeatOffSP = (EffHeatOnSP + AV10)
1
See Table 31 for WSHP models associated with HP0, HP1,
HP2 and HP3 respectively.
Setpoint Methods – lonWorks
NOTE: All calculations shown in 1-5 below apply to Stage #1
heating/cooling.
1. The unit is operating in Unoccupied mode.
• EffCoolOnSP = nciSetpoints.unoccupied_cool
• EffCoolOffSP = (EffCoolOnSP – nciUnoccDiff)
• EffHeatOnSP = nciSetpoints.unoccupied_heat
• EffHeatOffSP = (EffHeatOnSP + nciUnoccDiff)
2. The unit is operating in Occupied or Standby
mode with Local Setpoint Adjust disabled by
nciLocSptEnable=0. This calculation then depends on
whether or not there is a valid nviSetpoint value. The
DeadBandFactor used in this calculation is shown here
for both Occupied and Standby modes (and applies to
both a valid and invalid nviSetpoint value):
Occupied: DeadBandFactor = ((nciSetpoints.occupied_
cool – nciSetpoints.occupied_heat) / 2)
Standby: DeadBandFactor = ((nciSetpoints.standby_cool
– nciSetpoints.standby_heat) / 2)
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