Carrier 50PG20-28 Controls, Start-Up, Operation, Service And Troubleshooting Instructions page 51

Configuration--+AIR.Q--+IA.FN= 2 (Always) The indoor
tan performance for IA.FN = 2 is the sane as the perforlnance
when IA.FN = 1 except the algorithm is not limited to occu-
pied periods only. The fan can be triggered on ,ahen the space
is occupied or unoccupied.
FAN ENABLE (IAQ Switch Input) The DCV algorithm
will operate whenever the building is occupied and the indoor
tan is operating or the whenever the IAQ algorithm has caused
the indoor tan to operate. The configuration Configuration
--->AIR.Q-->ILFN (IAQ Switch Input Fan CFG) determines
whether or not the IAQ algorithin can turn on the indoor fan.
If the indoor fan is not operating, the economizer position
will be zero. The dalnper position may exceed (bnfiguration
--->AIR.Q-->EC.MN to provide economizer cooling.
Configuration-->AIR.Q-->II.FN = 0 (Never) When ILFN
= 0, the IAQ algorithin can never turn on the tan.
Configuration-->AIR.Q-->II.FN= 1 (Occupied) When
ILFN = 1, the IAQ algorithm will turn on the indoor fan when-
ever the building is occupied and IAQ is high. The indoor thn
will mrn offif IAQ reams to nonnat.
(bnfiguration-->AIR.Q-->II.FN= 2 (Abvays) The indoor
thn performance for ILFN = 2 is the sane as the performance
when ILFN = 1 except the algorithin is not limited to occupied
periods only. The tan can be triggered on when the space is
occupied or unoccupied.
Temperature Compensated Start
--
This logic is
used when the unit is in the unoccupied state. The control will
calculate early Start Bias time based on Space Temperature
deviation tiom the occupied cooling and heating set points.
This wilt allow the control to start the unit so that the space is at
coMitioned levels when the occupied period starts. This is
required for ASHRAE 90.1 compliance. This control function
requires a valid occupancy schedule. A space sensor is required
for non-linkage applications.
SETTING UP THE SYSTEM The settings for tempera-
ture compensated start can be found in the bcal display uMer
Configuration -->UNIT.
ITEM EXPANSION
TCS.C Temp.Cmp.Strt.Cool Factrl0-60
Imin
ITCSTCOOL
TCS.H Temp.Cmp.Strt.Heat Factr 10- 60 I min ITCSTHEAT
Temp Comp Strt Cool Factr (TC£O This is the factor for
the start time bias equation for cooling.
Temp Lamp Strt Heat Factr (T(A£//) This is the i_actorfor
the start time bias equation for heating.
NOTE: Temperature compensated start is disabled when these
factors are set to 0.
TEMPERATURE COMPENSATED START LOGIC The
following conditions must be met for the algorithin to an:
• Unit is in unoccupied state.
• Next occupied time is valid.
• Current time of day is valid.
• Valid space temperature reading is available (sensor or
CCN network).
The algorithm will calculate a Start Bias time in minutes us-
ing the following equations:
If (space temperature > occupied cooling set point)
Start Bias Time (space temperature occupied cooling set
point)* TCS.C
If (space temperature < occupied heating set point)
Start Bias Time (occupied heating set point space
temperature) *T(_'S.H
When the Start Bias Time is greater than zero the algorithm
will subtract it from the next occupied time to calculate the new
start time. When the new start time is reached, the Temperature
Compensated Start mode is set, the tan is started a11dthe unit
controlled as in an occupied state. Once set, Temperature
Compensated mode wilt stay on until the unit goes into the
Occupied mode. The Start Bias Time will be written into the
CCN Linkage Equipment Table if the unit is controlled in DAV
mode. If the Unoccupied Economizer Free Cool mode is active
when temperature compensated start begins, the Unoccupied
Free Coot mode will be stopped.
Carrier Comfort Network® (CCN) Configura-
tion -- It is possible to confignre the ComJortLink
TM
control
to participate as an element of the Can-ier Comtbrt Network
(CCN) system directly fiom the local display. This section will
deal with explaining the various pro m_mrnnableoptions which
are found under the CCN sub-menu in the Conti_ration mode.
The major confignrations for CCN pro_amming are
located in the local displays at Configuration_,CCN. See
Appendix A.
CCN Address (C(DC]A) This configuration is the CCN ad-
dress the rooftop is assigned.
CCN Bus Number (CCN.B) This confi_ration is the
CCN bus the rooftop is assigned.
CCN Baud Rate (BAUD) This configuration is the CCN
baud rate.
CCN Time/Date Broadcast (BROD--+B.TIM) If this con-
fignration is set to ON, the control will periodically send the
time and date out onto the CCN bus once a lninute. If this
device is on a CCN newvork then it will be important to make
sure that only one device on the bus has this confignration set
to ON. If more than one time broadcaster is present, pmblelns
with the time will occur.
NOTE: Only the time and date broadcaster can perform
daylight savings time adjustlnents. Even if the rooftop is stand
alone, the user may ,a_antto set this to ON to accolnplish the
daylight/savings function.
CCN OAT Broadcast (BROD--+B.OAI) If this confignra-
tion is set to ON, the control will periodically broadcast its
outside-air telnperamre at a rate of once every 30 minutes.
Global Schedule Broadcast (BROD--+B.GS) If this con-
figuration is set to ON and the schedule nmnber (S(TL.N) is be-
tween 65 and 99, then the control will broadcast the internal
time schedule once evelT 2 minutes.
CCN Broadcast Acknowledger (BROD-->B.ACIG If this
confignration is set to ON, then when any broadcasting is done
on the bus, this device will respond to and ackalowledge. Only
one device per bus can be configured tbr this option.
Schedule Number (SCH.O_NCH.N) This confignration
determines what schedule the control may follo,a:
SCH.N 0 The control is always occupied.
SCH.N 1 The control follows its internal time sched-
ules. The user may enter any nmnber
between 1 and 64 but it wilt be overwritten
to "1" by the control as it only has one
internal schedule.
SCH.N 65-99 The control is either set up to receive to a
broadcasted time schedule set to this nmnber
or the control is set up to broadcast its inter-
nal thne schedule (B.GS) to the newvork and
this is the global schedule nmnber it is
broadcasting. If this is the case, then the con-
trol still tbllows its internal time schedules.
Accept Global Holidays? (SCH.O--->HOL.G) If a device
is broadcasting the time on the bus, it is possible to accept the
time yet not accept the global holiday tiom the broadcast
message.
Override Time Limit (SCH.O_OV.TL) This configura-
tion allows the user to decide how long an override occurs
when it is initiated. The ovemde may be confignred tiom 1 to
4 hours. If the time is set to 0, the override function will
become disabled.
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