Remote Control Switch Input; Hot Gas Bypass; Space Temperature Offset - Carrier Weathermaster 48P2030-100 Controls, Start-Up, Operation, Service, And Troubleshooting

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.
VFD2 Type (TYPE)
This configuration sets the type of VFD communication. This
configuration should not be changed without first consulting a
Carrier service engineering representative.

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 81.
Table 81 — Remote Switch Configuration
ITEM EXPANSION
REMT Remote Input State
RM.CF Remote Switch Config
RMI.L RemSw
Off-Unoc-Strt-NoOv
Remote Input State (Inputs
This is the actual real time state of the remote input.
Remote Switch Config (Configuration
This is the configuration that allows the user to assign different
types of functionality to the remote discrete input.
• 0 — NO REMOTE SW — Remote switch will not be used.
• 1 — OCC-UNOCC SW — The remote switch input will con-
trol the occupancy state. When the remote switch input is ON,
the unit is forced into the occupied mode. When the remote
switch is OFF, the unit is 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
REMOTE
SWITCH LOGIC SWITCH
CONFIGURATION STATUS
(RMI.L)
OPEN
OPEN
CLOSED
OPEN
CLOSED
CLOSED
CCN
RANGE UNITS
POINT
ON/OFF RMTIN
0 to 3 RMTINCFG
Open/Close RMTINLOG
 
GEN.I REMT)
 
UNIT RM.CF)

Table 82 — Remote Switch Logic Configuration
REMOTE INPUT STATE
(REMT)
OFF (0)
ON (1)
ON (0)
OFF (1)
variable is configured OPEN, then when the switch is open,
the remote input switch perceives the logic state as OFF. Cor-
respondingly, if RMI.L is set to CLOSED, the remote input
switch will perceive a closed switch as meaning OFF. See
Table 82.

Hot Gas Bypass

The ComfortLink control system supports the use of an option-
al minimum load hot gas bypass valve (MLV) that is directly
controlled by the ComfortLink control system. This provides
an additional stage of capacity as well as low load coil freeze
protection. Hot gas bypass is an active part of the P-Series
ComfortLink capacity staging and minimum evaporator load
protection functions. It is controlled through 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 thermistor in the suc-
tion line allows the unit control to monitor suction superheat.
When the unit control calls for hot gas bypass, the hot gas by-
passes 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
ITEM EXPANSION
SP.O.S Space Temp
Offset Sensor
SP.O.R Space Temp
Offset Range
SPTO Space Temperature
Offset
Space Temperature Offset Sensor (Configuration

SENS SP.O.S)
This configuration disables the reading of the offset slider.
Space Temperature Offset Range (Configuration

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
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.
REMOTE SWITCH CONFIGURATION (RM.CF)
0
No Remote Switch Occ-Unocc Switch
xxxxx Unoccupied
xxxxx Occupied
xxxxx Occupied
xxxxx Unoccupied
99
 
UNIT C.TYP = 4).
RANGE UNITS
Enable/
Disable
1 to 10
+- SP.O.R ^F


1 2
Start/Stop
Start No Override
Stop
Stop
Start No Override
CCN
POINT
SPTOSENS
SPTO_RNG
SPTO
 
UNIT

UNIT

AIR.T
3
Override
Override
Override