Carrier WEATHERMASTER 48Z030, Operation And Service Manual

Page: 83 / 180

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Table 67 — Display Configuration
Remote Control Switch Input —
The remote switch
input is located on the RCB board and connected to TB201
terminals 1 and 2. The switch can be used for several remote
control functions. See Table 68.
Table 68 — Remote Switch Configuration
Remote Input State ( Inputs
→
GEN.I
→
REMT ) — This is
the actual real time state of the remote input.
Remote Switch Config
( Configuration
→
UNIT
→
RM.CF )
— This is the configuration that allows the user to assign dif-
ferent 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 occu-
pied state. When the remote switch is OFF, the unit will
use its internal 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 variable is configured OPEN, then when the
switch is open, the remote input switch perceives the logic state
as OFF. Correspondingly, if RMI.L is set to CLOSED, the re-
mote input switch will perceive a closed switch as meaning
OFF. See Table 69.
Hot Gas Bypass —
Hot gas bypass is an automatically
operating system used to limit evaporator suction pressure
during periods of low evaporator loading. This system is not
controlled by the Comfort Link™ control system and it is
available to operate whenever circuit A is running.
The hot gas bypass option consists of a pressure regulating
valve, a manual service valve and tubing connecting the circuit
A hot gas refrigerant line to the circuit A evaporator distribu-
tors (one distributor on sizes 030-035, two distributors on sizes
040-105). The pressure regulating valve opens the bypass
circuit as the evaporator suction pressure decreases into a range
that might generate frost formation on the evaporator surface
if sustained compressor operation occurs. The hot gas refriger-
ant enters the evaporator coil and adds refrigeration load to the
compressor circuit to offset a low load situation in the mixed
air temperature condition. Total bypass capacity is approxi-
mately 5 tons.
The hot gas bypass system is a factory-installed option,
installed on circuit A only. When this option is provided, the
control function for Lead-Lag sequencing must be disabled
( Configuration
→
Cool
→
L.L.EN is set to No).
Space Temperature Offset —
Space Temperature Off-
set corresponds to a slider on a T56 sensor that allows the occu-
pant to adjust the space temperature by a configured range
during an occupied period. This sensor is only applicable to
units that are configured as either 2-Stage SPT or Multi-Stage
SPT control ( Configuration
→
UNIT
→
C.TYP = 5 and 6).
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 read-
ing of the slider potentiometer in the T56 that is resolved to
delta degrees based on SP.O.R .
Table 69 — Remote Switch Logic Configuration
ITEM EXPANSION RANGE UNITS POINT DEFAULT
TEST Test Display LEDs ON/OFF TEST Off
METR Metric Display ON/OFF DISPUNIT Off
LANG Language Selection 0-1(multi-text strings) LANGUAGE 0
PAS.E Password Enable ENABLE/DISABLE PASS_EBL Enable
PASS Service Password 0000-9999 PASSWORD 1111
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
ITEM EXPANSION RANGE UNITS
CCN
POINT
SP.O.S Space Temp
Offset Sensor Enable/
Disable SPTOSENS
SP.O.R Space Temp
Offset Range 1 - 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