Display - Carrier FLOTRONIC II 30GN040-420 Operating And Troubleshooting Manual

Table 10 — Operational and Mode Display Codes
The operating modes are displayed by name or code num-
ber, to indicate the operating status of the unit at a given
time. The modes are:
CODE
Unit is off. LOCAL/ENABLE-STOP-CCN switch is in
OFF position, or LOCAL/ENABLE-STOP-CCN switch
LOCAL OFF
may be in LOCAL position with external ON/OFF
switch in OFF position.
Unit is off due to CCN network command. LOCAL/
CCN OFF
ENABLE-STOP-CCN switch is in CCN position.
CLOCK OFF Unit is off due to internal clock schedule. LOCAL/
ENABLE-STOP-CCN switch is in LOCAL position.
Unit is on. LOCAL/ENABLE-STOP-CCN switch is in
LOCAL ON LOCAL position. If external ON/OFF switch is used,
it will be in ON position.
Unit is on due to CCN command. LOCAL/ENABLE-
CCN ON
STOP-CCN switch is in CCN position.
Unit is on due to internal clock schedule or occu-
CLOCK ON pied override function. LOCAL/ENABLE-STOP-
CCN switch is in LOCAL/ENABLE position.
Dual set point is in effect. In this mode, unit contin-
ues to run in unoccupied condition, but leaving fluid
MODE 7
set point is automatically increased to a higher level
(CSP2 set point is in SET function).
Temperature reset is in effect. In this mode, unit is
using temperature reset to adjust leaving fluid set
point upward, and unit is currently controlling to the
MODE 8
modified set point. The set point can be modified based
on return fluid, outdoor-air temperature, or space tem-
perature.
Demand limit is in effect. This indicates that ca-
pacity of unit is being limited by demand limit control
MODE 9 option. Because of this limitation, unit may not
be able to produce the desired leaving fluid
temperature.
Flotronic™ System Manager (FSM) is controlling the
MODE 10
chiller.
MODE 11 Not applicable.
Ramp load (pulldown) limiting is in effect. In this mode,
the rate at which leaving fluid temperature is dropped
is limited to a predetermined value to prevent com-
MODE 12 pressor overloading. See CRAMP set point in the
SET function in Table 9. The pulldown limit can be
modified, if desired, to any rate from .2 F to 2 F
(.1° to 1° C)/minute.
Timed override is in effect. This is a 1 to 4 hour tem-
porary override of the programmed schedule, forc-
MODE 13 ing unit to occupied mode. Override can be imple-
mented with unit under LOCAL/ENABLE or CCN
control. Override expires after each use.
Low cooler suction protection is in effect. In this mode,
circuit capacity is not allowed to increase if cooler
saturated suction temperature is 20° F (11° C) for
fluid or 30° F (16° C) for brine or more below leaving
MODE 14
fluid temperature, and saturated suction tempera-
ture is less than 32 F (0° C). If these conditions per-
sist beyond 10 minutes, circuit is shut down and fault
code 44 or 45 is displayed.
MODE 15 Water System Manager is controlling the chiller.
MODE 16 Slow change override is in effect.
MODE 17 X minute off-to-on delay is in effect.
MODE 18 Low suction superheat protection is in effect.
CCN — Carrier Comfort Network
DESCRIPTION
(Set Point) — This subfunction displays leaving
fluid temperature and leaving chilled fluid set point. If unit
is programmed for dual set point, the chilled fluid set point
currently in effect (either occupied or unoccupied) is
displayed. If reset is in effect, the unit operates to the modi-
fied chilled fluid set point. This means the leaving fluid tem-
perature may not equal the chilled fluid set point. The
modified chilled fluid set point can also be displayed in the
Status function. To enter the set point subfunction,
press and press
lowed by the modified leaving chilled fluid set point and ac-
tual control temperature.
(Temperature) — The temperature subfunction dis-
plays the readings at temperature sensing thermistors.
To read a temperature, enter
sired temperature using the
order of readouts. This subfunction also displays the satu-
rated refrigerant temperatures corresponding to the suction
and discharge pressures measured by the compressor
transducers.
(Pressure) — This subfunction displays suction,
discharge, and net oil pressure at lead compressor of each
circuit of unit.
(Analog Inputs) — This subfunction displays
analog inputs, if any. Press
transducer supply voltage, 4-20 mA reset signal can be dis-
played. This is useful for problem diagnosis prior to using
the test function.
(Discrete Inputs) — This subfunction displays sta-
tus (open/closed) of discrete input switch where applicable.
Status of dual set point switch and demand limit switches 1
and 2 can be displayed. This is useful for problem diagnosis
prior to using the test function.
(Outputs) — This function displays on/off sta-
tus of alarm relay, all fan relays, and chilled water pump
relay. It also displays on/off status of compressor unloaders
(if used). The position of each EXV (in percent open) can be
displayed.
TEST FUNCTION — The test function operates the diag-
nostic program. To initiate test function, the LOCAL/
ENABLE-STOP-CCN switch must be in STOP position.
To reach a particular test, press its subfunction number,
then scroll to desired test by pressing
start a test. Press
test. Pressing the
system to next test, whether current test is operating or has
timed out. Once in the next step, you may start
test by pressing
While the unit is in test, you may leave test function and
access another display or function by pressing appropriate
keys. However, a component that is operating when an-
other function is accessed remains operating. You must
re-enter test function and press
ponent. Components with a timed operating limit time out
normally even if another function is accessed.
37
to display the set point fol-
, then scroll to de-
key. See Table 9 for the
, then press
. Press
or or to terminate or exit a
key after a test has started advances
or advance past it by pressing
to shut down the com-
. The
to
.