ED 15103-6 • MICROTECH III WSHP UNIT CONTROLLER 58 www.DaikinApplied.com
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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
L
on
W
orks
methods are the shown separately.
A space temperature setpoint operation diagram illustrates
the relationship among the inputs and their default values
(
). The last section includes examples of common
applications using default values.
is the set of default values for each parameter. Refer
to these defaults for the example applications (
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 = (EffHe 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 = (Refer DeadBandFactor)
• EffCoolOffSP = (EffCoolOnSP – AV10)
• EffHeatOnSP = (ReferenceSP – DeadBandFactor)
• EffHeatOffSP = (EffHe 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 – DeadBand
AV35)
Standby: ReferenceSP = (AV2 – DeadBand
AV35)
• EffCoolOnSP = (Refer DeadBandFactor)
• EffCoolOffSP = (EffCoolOnSP – AV10)
• EffHeatOnSP = (ReferenceSP – DeadBandFactor)
• EffHeatOffSP = (EffHe 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 = (Refer DeadBandFactor)
• EffCoolOffSP = (EffCoolOnSP – AV10)
• EffHeatOnSP = (ReferenceSP – DeadBandFactor)
• EffHeatOffSP = (EffHe 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 = (EffHe 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 = (EffHe AV10)
1
for WSHP models associated with HP0, HP1,
HP2 and HP3 respectively.
Setpoint Methods –
l
on
W
orks
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 = (EffHe 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)
