77
TEMPERATURE COMPENSATED START LOGIC
The following conditions must be met:
• 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 setpoint)
Start Bias Time = (space temperature – occupied cooling
setpoint)*
TCS.C
If (space temperature < occupied heating setpoint)
Start Bias Time = (occupied heating setpoint – 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 Temperature Com-
pensated Start mode is set (
Operating Modes
MODE
T.C.ST
), the fan is started and 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 con-
trolled in DAV mode. If the Unoccupied Economizer Free Cool
mode is active (
Operating Modes
HVAC
= “UNOCC FREE
COOL”) when temperature compensated start begins, the Unoc-
cupied Free Cool mode will be stopped.
Carrier Comfort Network (CCN) System
It is possible to configure the
Comfort
Link
®
control 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
.
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. For units equipped with
the optional UPC, the CCN Baud Rate must be set to 9600.
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 stand alone, 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 every
30 minutes.
CCN OAQ Broadcast (OAQ.B)
If this configuration is set to ON, the control will periodically
broadcast its outside air quality reading at a rate of once every
30 minutes.
Global Schedule Broadcast (G.S.B)
If this configuration is set to ON and the schedule number
(
SCH.N
) is between 65 and 99, then the control will broadcast
the internal time schedule once every 2 minutes.
CCN Broadcast Acknowledger (B.ACK)
If this configuration is set to ON, then when any broadcasting is
done on the bus, this device will respond to and acknowledge.
Only one device per bus can be configured for this option.
Schedule Number (SCH.N)
This configuration determines what schedule the control may
follow.
SCH.N
= 0
The control is always occupied.
SCH.N
= 1
The control follows its internal time schedules.
The user may enter any number between 1
and 64 but it will be overwritten to “1” by the
control as it only has one internal schedule.
SCH.N
= 65-99The control is either set up to receive to a
broadcasted time schedule set to this number
or the control is set up to broadcast its inter-
nal time schedule (
G.S.B
) to the network and
this is the global schedule number it is broad-
casting. If this is the case, then the control
still follows its internal time schedules.
Table 70 — CCN Configuration
* For units equipped with optional UPC, the CCN Baud Rate must be set to 3.
ITEM
EXPANSION
RANGE
UNITS
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 WEATHERMAKER 48A2020
Page 112: ...112 Fig 20 Typical Main Control Box Wiring Schematic 48 50A Units ...
Page 113: ...113 Fig 21 Typical Auxiliary Control Box Wiring Schematic ...
Page 114: ...114 Fig 22 Typical 2 Stage Gas Heat Wiring Schematic Size 060 Units Shown ...
Page 115: ...115 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown TO NEXT PAGE ...
Page 116: ...116 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown cont ...
Page 117: ...117 Fig 24 Typical Electric Heat Control Schematic 50 Series Size 060 Units Shown ...
Page 118: ...118 Fig 25 Typical Controls Option Wiring Schematic SW1 SW2 OR DEHUMIDIFY SWITCH ...
Page 119: ...119 Fig 26 Typical Power Schematic 48 50A2 A3 A4 A5 060 Unit Shown ...
Page 120: ...120 Fig 27 Typical Power Schematic of Greenspeed Low Ambient Option 48 50A 060 Unit Shown ...
Page 121: ...121 Fig 28 Typical Small Chassis Component Location Size 020 035 Units ...
Page 122: ...122 Fig 29 Typical Large Chassis Component Locations Size 040 060 Units ...
Page 185: ...185 APPENDIX C VFD INFORMATION cont Fig F Internal Enclosure Fan Replacement A48 7716 ...