System Parameters - Carrier CAPRI-280 Operation And Service Manual

2.4.8 SYSTEM PARAMETERS

Pressing the up/down arrow keys will allow the user to
scroll up or down through the parameters. If no key is
pressed for 30 seconds this mode is exited and the
display will revert back to setpoint. Pressing the on/off
key any time will exit this mode and the display will
CODE CODE NAME
P1 Return Air Temperature
P2 Coil Temperature
P3 Ambient Temperature
P4 Suction Line Tempera-
ture (not used)
P5 Suction Pressure
P6 Discharge Pressure
P7 Superheat (not used)
P8 Analog Setpoint Tem-
perature (not used)
P9 A/C Control Window #1
P10 A/C Control Window #2
P11 A/C Control Window #3
P12 Heat Control Window
P13 Compressor Safety Off
Delay
P14 Fan Delay
T-283
again indicate the setpoint setting. The parameters
are shown in Table 2-2. When scrolling through the
parameters, the current parameter parameter will be
displayed for two seconds. After two seconds, the
display will show the data for the current parameter.
When the last parameter is reached, the next
parameter will wrap back to one.
Table 2-2. Parameter Codes
This value is the temperature measured by the return air sensor. If the sensor
is shorted it will display CL. If it is open circuited it will display OP .
This value is the coil temperature measured by the evaporator temperature
sensor. If the sensor is shorted it will display CL. If it is open circuited it will
display OP .
This value is the outside temperature measured by the ambient temperature
sensor. If the sensor is shorted it will display CL. If it is open circuited it will
display OP .
Not used.
This value is the suction pressure measured by the suction pressure transduc-
er. If the sensor is shorted it will display CL If it is open circuited it will display
OP . If the auto key is pressed and held for five seconds the suction pressure
will be calibrated to zero and the offset will be stored in no-volatile memory.
This calibration will be locked out if the offset is greater than 20 or less than
6.7 or if the clutch output is energized.
This value is the discharge pressure measured by the discharge pressure
transducer. If the sensor is shorted it will display "CL " and if it is open circuited
it will display "OP". If the auto key is pressed and held for five seconds the
suction pressure will be calibrated to zero and the offset will be stored in
non-volatile memory. This calibration will be locked out if the offset is greater
than 20 or less than 6.7 or if the clutch output is energized.
Not used.
Not used.
This is the number of degrees F above setpoint at which the unloaders will be
both energized. This value can be modified between 0 and 10 degrees F. The
default value is 1 degree F.
This is the number of degrees F above AC control window one at which the
first unloader will be energized. This value can be modified between 0 and 10
degrees F. The default value is 1 degree F.
This is the number of degrees F above AC control window two at which the
evaporator fan speed will be set to low. This value can be modified between
0 and 10 degrees F. The default value is 1 degree F.
This is the number of degrees F below setpoint before the heat valve is ener-
gized. This value can be modified between 0 and 10 degrees F. The default
value is 2 degree F for heat and 4 degrees F for reheat.
This number is the minimum time in minutes that the compressor must be off
after a high or low pressure alarm before it can be restarted. This value can be
modified between one and five minutes. The default value is 1.
This is the minimum time (in seconds) that the fans must run at a particular
speed before changing to another speed. This value can be modified be-
tween one and 60 seconds. The default value is two seconds.
2-5
DESCRIPTION