Carrier Ecologic Series 3 Controls, Start-Up, Operation, Service, And Troubleshooting page 26

CODE
LOCAL OFF Unit is off. LOCAL/OFF/REMOTE switch is in OFF
position or LOCAL/OFF/REMOTE switch is in
REMOTE position and remote contacts are open.
CCN OFF Unit is off. LOCAL/OFF/REMOTE switch is in
LOCAL position and CCN control is enabled (Stop
state) or CCN is enabled (Stop state) with LOR
switch in REMOTE position and remote contacts
closed.
CLOCK OFF Unit is off due to internal clock schedule. LOR
switch is in LOCAL position.
LOCAL ON Unit is on. LOR switch is in LOCAL position and
CCN is disabled or LOR switch is in REMOTE
position with contacts closed and CCN is disabled.
CCN ON Unit is on due to CCN command. LOR switch is in
LOCAL position and CCN is enabled (Run state)
or LOR switch is in REMOTE position with con-
tacts closed and CCN is enabled (Run state).
CLOCK ON Unit is on due to internal clock schedule or occu-
pied override function. LOR switch is in LOCAL
position.
DUAL SP ACTIVE Dual set point is in effect. In this mode, unit contin-
ues to run in an occupied condition, and leaving
(1st SP)
fluid set point is automatically controlled to the
CSP1 set point in the SET POINT function.
DUAL SP ACTIVE Dual set point is in effect. In this mode, unit contin-
ues to run in unoccupied condition, but leaving
(2nd SP)
fluid set point is automatically increased to a
higher level (CSP2 set point is in SET POINT
function).
TEMPERATURE Temperature reset is in effect. In this mode, unit is
RESET ACTIVE using temperature reset to adjust leaving fluid set
point upward, and unit is currently controlling to
the modified set point. The set point can be modi-
fied based on return fluid, outdoor-air temperature,
space temperature, or 4 to 20 mA signal.*
DEMAND LIMIT Demand limit is in effect. This indicates that
ACTIVE capacity of unit is being limited by demand limit
control option. Because of this limitation, the unit
may not be able to produce the desired leaving
fluid temperature. Demand limit can be controlled
by a switch or 4 to 20 mA signal.*
FSM Flotronic™ System Manager (FSM) is controlling
the chiller.
CONTROLLING
RAMP LOADING Ramp load (pulldown) limiting is in effect. In this
mode, the rate at which leaving fluid temperature
ACTIVE
is dropped is limited to a predetermined value to
prevent compressor overloading. See CRAMP set
point in the SET POINT function (page 27). The
pulldown limit can be modified, if desired, to any
rate from 0.2° F to 2° F (0.1° to 1° C)/minute.
TIMED OVERRIDE Timed override is in effect. This is a 1 to 4 hour
temporary override of the programmed schedule,
ACTIVE
forcing unit to occupied mode. Override can be
implemented with unit under LOCAL/REMOTE or
CCN control. Override expires after each use.
WSM Water System Manager is controlling the chiller.
CONTROLLING
SLOW CHANGE Slow change override is in effect. The leaving fluid
OVERRIDE temperature is close to and moving towards the
control point.
LEGEND
CCN — Carrier Control Network
CSP — Cooling Set Point
CRAMP — Cooling Ramp Loading
EXV — Electronic Expansion Valve
LOR — Local/Off/Remote
SP — Set Point
WSM — Water System Manager
1
*A field-supplied 500 Ohm / W resistor must be installed across
2
the input terminals when using a 4 to 20 mA signal.
Table 15 — Operational and Mode Display Codes
DESCRIPTION
Table 16 — Reading Current Operating Mode
KEYPAD ENTRY
CODE
OFF TO ON Chiller is being held off by Minutes Off Time found by
DELAY ACTIVE
keying
includes a minimum 1.5 minute delay after a capacity
stage change has been made. This delay is adjustable
from 1.5 to 6 minutes.
LOAD LIMIT This function determines the maximum allowable
capacity that can be running and is accomplished
ACTIVE
through the Flotronic System Manager. The unit may
not be able to produce the desired leaving fluid
temperature.
2 CHILLR LEAD This mode indicates that Master and Slave chillers
have been configured and are operating using the
LAG ACTIVE
Dual Chiller control. This is a series water flow
arrangement where chilled fluid is piped to the Slave
Chiller first and then through the Master Chiller.
Leaving Fluid Temperature control is performed based
on Master Chiller Leaving Fluid Temperature.
2 CHILLR LL This mode indicates that communication has been lost
between the Master and Slave chillers. Both
COMM FAILURE
chillers will return to a stand-alone mode of operation
until communication is restored.
CIRCUIT A LOW If the discharge superheat is less than 5° F (2.8° C)
and falling, a circuit loader will be deenergized every
DISCHARGE
30 seconds. The final stage will not be unloaded
SUPERHT
unless an alarm condition is present.
CIRCUIT B LOW See description for Circuit A above.
DISCHARGE
SUPERHT
CIRCUIT A If the circuit is running and the Saturated Condensing
Temperature (SCT) is greater than the Maximum
HIGH SCT
Condensing Temperature Set point (MCT_SP) minus
12° F (6.7° C), the control will not add any stages.
If the SCT is greater than the MCT_SP plus 5° F
(2.8° C), the circuit will be unloaded and shut down if
necessary. If the SCT is greater than the MCT_SP
plus 2° F (1.1° C) for one minute, a loader will be
deenergized.
If the SCT is greater than the MCT_SP minus 4° F
(2.2° C), the control will compare the maximum
operating pressure set point (MOP_SP) with the modi-
fied MOP_SP (MOP_CTRL).
If the MOP_CTRL is greater than the MOP_SP, the
mode will be cleared. Otherwise the control will
display the high SCT override mode. The capacity
control routine will not add any stages. If the circuit is
at its lowest capacity, this mode will be ignored.
CIRCUIT B See description for Circuit A above.
HIGH SCT
LOW COOLER Circuit A and/or B low saturated suction condition
exists. Control will not increase capacity on affected
SUCTION
circuits. The EXV of the affected circuit(s) will be
TEMPERATURE
opened until the condition does not exist.
DISPLAY
MODES :MODE_TBL
CCN ON
DEMAND LIMIT
ACTIVE
26
DESCRIPTION
. Also, normal operation of the chiller