Controls, Start-Up, Operation, Service and ... - Climayoreo

*This default is model number dependent.
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 connected to TB201
terminals 3 and 4. The switch can be used for several remote
control functions. See Table 68.
Table 68 — Remote Switch Configuration
ITEM EXPANSION RANGE UNITS
CCN
POINT
REMT Remote
Input State
ON/OFF RMTIN
RM.CF Remote Switch
Config
0 - 3 RMTINCFG
RMI.L RemSw
Off-Unoc-Strt-NoOv
Open/Close RMTINLOG
Remote Input State (InputsGEN.IREMT) — This is
the actual real time state of the remote input.
Remote Switch Config (ConfigurationUNIT 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 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
commanded 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 internal or external time schedules.
Remote Switch Logic Configuration (Configuration
SW.LGRMI.L) — The control allows for the configuration
of a normally open/closed status of the remote input switch via
RMI.L. If this variable is configured OPEN, then when the
Table 67 — Exhaust Fan VFD Configuration
ITEM EXPANSION RANGE UNITS CCN POINT DEFAULTS
E.VFD EXHAUST FAN VFD CONFIG
N.VLT VFD2 Nominal Motor Volts 0 to 999 Volts VFD2NVLT 460*
N.AMP VFD2 Nominal Motor Amps 0 to 999 Amps VFD2NAMP 28.7*
N.FRQ VFD2 Nominal Motor Freq 10 to 500 Hz VFD2NFRQ 60
N.RPM VFD2 Nominal Motor RPM 50 to 30000 RPM VFD2NRPM 1750
N.PWR VFD2 Nominal Motor HPwr 0 to 500 H.P. VFD2NPWR 20*
M.DIR VFD2 Motor Direction 0=FWD, 1=REV VFD2MDIR 0
ACCL VFD2 Acceleration Time 0 to 1800 sec VFD2ACCL 30
DECL VFD2 Deceleration Time 0 to 1800 sec VFD2DECL 30
SW.FQ VFD2 Switching Frequency 0=1kHz, 1=4kHz, 2=8kHz, 3=12kHz VFD2SWFQ 2
TYPE VFD2 Type 0=LEN, 1=ANALOG VFD2TYPE 0
88
switch is open, the remote input switch perceives the logic state
as OFF. Correspondingly, if RMI.L is set to CLOSED, the remote
input switch will perceive a closed switch as meaning
OFF. See Table 69.
Hot Gas Bypass — The ComfortLink control system
supports the use of an optional 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
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
thermistor in the suction line allows the unit control to monitor
suction superheat. When the unit control calls for hot gas bypass,
the hot gas bypasses the evaporator and adds refrigeration
load to the compressor circuit to reduce the cooling effect from
Circuit A.
The hot gas bypass system is a factory-installed option installed
on Circuit A only. This function is enabled at ConfigurationCOOLMLV.
When this function is enabled, an additional
stage of cooling capacity is provided by the unit control
staging sequences (see Appendix C).
Space Temperature Offset — Space Temperature Offset
corresponds to a slider on a T56 sensor 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 (ConfigurationUNITC.TYP
= 4).
ITEM EXPANSION RANGE UNITS
CCN
POINT
SP.O.S Space Temp Enable/
SPTOSENS
Offset Sensor Disable
SP.O.R Space Temp
Offset Range
1 - 10 SPTO_RNG
SPTO Space Temperature
Offset
+- SP.O.R ^F SPTO
Space Temperature Offset Sensor (ConfigurationUNIT
SENSSP.O.S) — This configuration disables the reading
of the offset slider.
Space Temperature Offset Range (Configuration
UNITSENSSP.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 (TemperaturesAIR.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.