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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 from the occupied cooling and heating
set points. This will allow the control to start the unit so that
the space is at conditioned levels when the occupied period
starts. This is required for ASHRAE 90.1-2013 compliance. A
space sensor is required for non-linkage applications.
SETTING UP THE SYSTEM
The settings for temperature compensated start can be found in
the local display under
Configuration
UNIT
.
TCST-Cool Factor (TCS.C)
This is the factor for the start time bias equation for cooling.
TCST-Heat Factor (TCS.H)
This is the factor for 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 algorithm to run:
• Unit is in unoccupied state.
• Next occupied time is valid.
• Current time of day is valid.
• Valid space temperature reading is available (sensor or
DAV-Linkage).
The algorithm will calculate a Start Bias time in minutes using
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 tem-
perature)*
TCS.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 Tem-
perature Compensated Start mode is set (
Operating
Modes
MODE
T.C.ST
), the fan is started and the unit
controlled as in an occupied state. Once set, Temperature
Compensated mode will 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 (
Operating Modes
HVAC
= “UNOCC FREE
COOL”) when temperature compensated start begins, the
Unoccupied Free Cool mode will be stopped.
Carrier Comfort Network
®
(CCN)
It is possible to configure the
Comfort
Link controls to partici-
pate as an element of the Carrier Comfort Network (CCN) sys-
tem directly from the local display. This section will deal with
explaining the various programmable options which are found
under the
CCN
sub-menu in the
Configuration
mode.
The major configurations for CCN programming are located in
the local displays at
Configuration
CCN
.
See Table 73.
CCN Address (CCNA)
This configuration is the CCN address the rooftop is assigned.
CCN Bus Number (CCNB)
This configuration is the CCN bus the rooftop is assigned.
CCN Baud Rate (BAUD)
This configuration is the CCN baud rate.
CCN Time/Date Broadcast (TM.DT)
If this configuration is set to ON, the control will periodically
send the time and date out onto the CCN bus once a minute. If
this device is on a CCN, network then it will be important to
make sure that only one device on the bus has this configura-
tion set to ON. If more than one time broadcaster is present,
problems with the time will occur.
NOTE: Only the time and date broadcaster can perform daylight
savings time adjustments. Even if the rooftop is standalone, the
user may want to set this to ON to accomplish the daylight/savings
function.
CCN OAT Broadcast (OAT.B)
If this configuration is set to ON, the control will periodically
broadcast its outside-air temperature at a rate of once every
30 minutes.
CCN OARH Broadcast (ORH.B)
If this configuration is set to ON, the control will periodically
broadcast its outside air relative humidity at a rate of once ev-
ery 30 minutes.
Table 73 — CCN Configuration
ITEM
EXPANSION
RANGE UNITS CCN POINT
TCS.C
Temp.Cmp.Strt.Cool Factr 0 to 60
min
TCSTCOOL
TCS.H
Temp.Cmp.Strt.Heat Factr 0 to 60
min
TCSTHEAT
ITEM
EXPANSION
RANGE
UNITS
CCN POINT
DEFAULT
CCN
CCN CONFIGURATION
CCNA
CCN Address
1 to 239
CCNADD
1
CCNB
CCN Bus Number
0 to 239
CCNBUS
0
BAUD
CCN Baud Rate
1 to 5
CCNBAUDD
3
BROD
CCN BROADCST DEFINITIONS
TM.DT
CCN Time/Date Broadcast
ON/OFF
CCNBC
On
OAT.B
CCN OAT Broadcast
ON/OFF
OATBC
Off
ORH.B
CCN OARH Broadcast
ON/OFF
OARHBC
Off
OAQ.B
CCN OAQ Broadcast
ON/OFF
OAQBC
Off
G.S.B
Global Schedule Broadcst
ON/OFF
GSBC
Off
B.ACK
CCN Broadcast Ack'er
ON/OFF
CCNBCACK
Off
SC.OV
CCN SCHEDULES-OVERRIDES
SCH.N
Schedule Number
0 to 99
SCHEDNUM
1
HOL.T
Accept Global Holidays?
YES/NO
HOLIDAYT
No
O.T.L.
Override Time Limit
0 to 4
HRS
OTL
1
OV.EX
Timed Override Hours
0 to 4
HRS
OVR_EXT
0
SPT.O
SPT Override Enabled ?
YES/NO
SPT_OVER
Yes
T58.O
T58 Override Enabled ?
YES/NO
T58_OVER
Yes
GL.OV
Global Sched. Override ?
YES/NO
GLBLOVER
No
Summary of Contents for Weathermaster 48P2030-100
Page 130: ...130 Fig 19 Typical Power Schematic Sizes 040 075 Shown ...
Page 131: ...131 Fig 20 Main Base Board Input Output Connections ...
Page 132: ...132 Fig 21 RXB EXB CEM SCB Input Output Connections ...
Page 133: ...133 Fig 22 Typical Gas Heat Unit Control Wiring 48P030 100 Units Shown ...
Page 134: ...134 Fig 23 Typical Electric Heat Wiring 50P030 100 Units Shown ...
Page 135: ...135 Fig 24 Typical Power Wiring 115 V ...
Page 136: ...136 Fig 25 Typical Gas Heat Section Size 030 050 Units Shown ...
Page 138: ...138 Fig 27 Component Arrangement Size 030 035 Units ...
Page 139: ...139 Fig 28 Component Arrangement Size 040 075 Units ...
Page 140: ...140 Fig 29 Component Arrangement Size 090 100 Units ...