100
VFD2 Motor Direction (M.DIR)
This configuration sets the direction of motor rotation. Motor
direction change occurs immediately upon a change to this
configuration. Power to the VFD need
NOT
be cycled for a
change to this configuration to take effect.
VFD2 Acceleration Time (ACCL)
This configuration sets the acceleration time from zero to max
-
imum output frequency. Power to the VFD must be cycled in
order for a change to this configuration to take effect.
VFD2 Deceleration Time (DECL)
This configuration sets the deceleration time from maximum
output frequency to zero. Power to the VFD must be cycled in
order for a change to this configuration to take effect.
VFD2 Switching Frequency (SW.FQ)
This configuration sets the switching frequency for the drive.
Power to the VFD must be cycled in order for a change to this
configuration to take effect.
Remote Control Switch Input
The remote switch input is located on the RXB board and con
-
nected to TB201 terminals 3 and 4. The switch can be used for
several remote control functions. See Table 69.
Remote Input State (Inputs
GEN.I
REMT)
This is the actual real time state of the remote input.
Table 69 —
Remote Switch Configuration
Remote Switch Config (Configuration
UNIT
RM.CF)
This is the configuration that allows the user to assign different
types of functionality to the remote discrete input.
• 0 — NO REMOTE SW — The remote switch will not be
used.
• 1 — OCC-UNOCC SW — The remote switch input will
control the occupancy state. When the remote switch input
is ON, the unit will be forced into the occupied mode.
When the remote switch is OFF, the unit will be forced
into the unoccupied mode.
• 2 — STRT/STOP — The remote switch input will start
and stop the unit. When the unit is commanded to stop, any
timeguards in place on compressors will be honored first.
When the remote switch is ON, the unit will be command
-
ed to stop. When the remote switch is OFF the unit will be
enabled to operate.
• 3 — OVERRIDE SW — The remote switch can be used to
override any internal or external time schedule being used
by the control and force the unit into an occupied mode
when the remote input state is ON. When the remote
switch is ON, the unit will be forced into an occupied state.
When the remote switch is OFF, the unit will use its inter
-
nal or external time schedules.
Remote Switch Logic Configuration (Configuration
SW.LG
RMI.L)
The control allows for the configuration of a normally open/
closed status of the remote input switch via
RMI.L
. If this vari
-
able is configured OPEN, then when the switch is open, the re
-
mote input switch perceives the logic state as OFF. Corre
-
spondingly, if
RMI.L
is set to CLOSED, the remote input
switch will perceive a closed switch as meaning OFF. See
Hot Gas Bypass
The
Comfort
Link control system supports the use of an optional
minimum load hot gas bypass valve (MLV) that is directly con
-
trolled by the
Comfort
Link control system. This provides an addi
-
tional stage of capacity as well as low load coil freeze protection.
Hot gas bypass is an active part of the N-Series
Comfort
Link ca
-
pacity staging and minimum evaporator load protection functions.
It is controlled though the Minimum Load Valve function. The hot
gas bypass option consists of a solenoid valve with a fixed orifice
sized to provide a nominal 3-ton evaporator load bypass. A hot gas
refrigerant line routes the bypassed hot gas from the discharge line
of Circuit A to the suction line of Circuit A. An additional thermis
-
tor in the suction line allows the unit control to monitor suction su
-
perheat. When the unit control calls for hot gas bypass, the hot gas
bypasses the evaporator and adds refrigeration load to the com
-
pressor circuit to reduce the cooling effect from Circuit A.
The hot gas bypass system is a factory-installed option in
-
stalled on Circuit A only. This function is enabled at
Configu
-
ration
COOL
MLV
. When this function is enabled, an ad
-
ditional stage of cooling capacity is provided by the unit con
-
trol staging sequences (see Appendix C).
Space Temperature Offset
Space Temperature Offset corresponds to a slider on a T56 sen
-
sor that allows the occupant to adjust the space temperature by
a configured range during an occupied period. This sensor is
only applicable to units that are configured as Multi-Stage SPT
control (
Configuration
UNIT
C.TYP
= 4).
Space Temperature Offset Sensor (Configuration
UNIT
SENS
SP.O.S)
This configuration disables the reading of the offset slider.
Space Temperature Offset Range (Configuration
UNIT
SENS
SP.O.R)
This configuration establishes the range, in degrees F, that the
T56 slider can affect
SPTO
when adjusting the slider from the
far left (
-
SP.O.R
) to the far right (+
SP.O.R
). The default is 5°F.
Space Temperature Offset Value (Temperatures
AIR.T
SPTO)
The Space Temperature Offset Value is the reading of the slider
potentiometer in the T56 that is resolved to delta degrees based
on
SP.O.R
.
Table 70 —
Remote Switch Logic Configuration
ITEM
EXPANSION
RANGE
UNITS
CCN
POINT
REMT
Remote
Input State
Off/On
RMTIN
RM.CF
Remote Switch
Config
0 to 3
RMTINCFG
RMI.L
RemSw
Off-Unoc-Strt-NoOv Open/Close
RMTINLOG
ITEM
EXPANSION
RANGE
UNITS CCN POINT
SP.O.S
Space Temp Offset Sensor
Enable/Disable
SPTOSENS
SP.O.R
Space Temp Offset Range
1 to 10
SPTO_RNG
SPTO
Space Temperature Offset
+-
SP.O.R
^F
SPTO
REMOTE
SWITCH LOGIC
CONFIGURATION
(RMI.L)
SWITCH
STATUS
REMOTE INPUT STATE
(REMT)
REMOTE SWITCH CONFIGURATION (RM.CF)
0
1
2
3
No Remote Switch
Occ-Unocc Switch
Start/Stop
Override
OPEN
OPEN
OFF (0)
xxxxx
Unoccupied
Start
No Override
CLOSED
ON (1)
xxxxx
Occupied
Stop
Override
CLOSED
OPEN
ON (0)
xxxxx
Occupied
Stop
Override
CLOSED
OFF (1)
xxxxx
Unoccupied
Start
No Override
Summary of Contents for WeatherExpert 48N2
Page 135: ...135 Fig 18 48 50N Typical Power Schematic Nominal 075 Ton Unit Shown ...
Page 136: ...136 Fig 19 48 50N Typical Power Schematic Nominal Ton 90 150 Units Shown ...
Page 137: ...137 Fig 20 48 50N Main Base Board Input Output Connections ...
Page 138: ...138 Fig 21 48 50N RXB EXB CEM Input Output Connections a48 9307 ...
Page 139: ...139 Fig 22 48 50N EXV SCB Input Output Connections a48 9308 ...
Page 140: ...140 Fig 23 48N Typical Modulating Gas Heat Unit Control Wiring ...
Page 141: ...141 Fig 24 50N Typical Electric Heat Unit Control Wiring ...
Page 144: ...144 Fig 27 48N Typical Gas Heat Section Wiring Nominal Ton 120 to 150 Units ...
Page 145: ...145 Fig 28 48 50N Typical Power Component Control Wiring 460 v ...
Page 146: ...146 Fig 29 48 50N Component Control Wiring 575 v Nominal Ton 075 to 150 Units ...
Page 147: ...147 Fig 30 48 50N Component Arrangement Power Box ...
Page 148: ...148 Fig 31 48 50N Component Arrangement Control Box ...
Page 240: ...240 APPENDIX D VFD INFORMATION CONT Fig G VFD Bypass Wiring Diagram WHEN USED ...