Carrier AquaEdge 19XRV series, Start-Up, Operation And Maintenance Instructions Manual

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Table 6 - Capacity overrides
OVERRIDE CONDITION FIRST STAGE SET POINT SECOND STAGE SET POINT OVERRIDE TERMINATION
View/Modify on
ICVC Screen
Override Default Value Configurable Range Value Value
High Condenser Pressure
(COND PRESS
OVERRIDE)
SETUP1 CONDENSER
PRESSURE >862 kPa
621 to 1138 kPa CONDENSER PRESSURE > COND
PRESS OV 16.5 kPA
CONDENSER PRESSURE <
CONDENSER PRESS
OVERRIDE – 6.9 kPa
High Motor Temperature
(COMP MOTOR TEMP
OVERRIDE)
SETUP1 COMP MOTOR WINDING
TEMP
> 93°C
66 to 93°C COMP MOTOR WINDING TEMP >
COMP MOTOR TEMP OVERRIDE
+ 5.6 K
COMPR MOTOR WINDING
TEMP < COMP MOTOR
TEMP OVERRIDE –1.1 K
Low Evaporator
Temperature (REFRIG
OVERRIDE DELTA T)
SETUP1 EVAPORATOR REFRIG
TEMP < EVAP REFRIG
TRI 1.7 K
1.1 to 2.8°C EVAPORATOR REFRIG TEMP <
EVAP REF OVERRIDE TEMP - 0.6 K
NOTE: EVAP REF OVERRIDE
TEMP = EVAP REFRIG TRIPPOINT
+ REFRIG OVERRIDE DELTA T
EVAP REFRIG TEMP > EVAP
REF OVERRIDE TEMP + 1.1 K
High Compressor Lift
(SURGE/HGBP DELTA
T,P)
OPTIONS Min T1: 0.8 K
Min P1: 345 kPa
Max T2: 5.6 K
Max P2: 586 kPa
0.3 - 1.1 K
207 - 1172 kPa
0.3 - 11.1 K
345 - 1172 kPa
None ACTIVE DELTA T > SURGE/
HGBP DELTA T + SURGE/
HGBP DEADBAND
Manual Guide Vane Target
(TARGET GUIDE VANE
POS)
COMPRESS Automatic 0 to 100% None Press RELEASE softkey after
selecting TARGET GUIDE
VANE POS
Manual Speed Control
(TARGET VFD SPEED)
COMPRESS Automatic VFD MINIMUM
SPEED to 100%
Forced TARGET VFD SPEED
cannot override either a capacity
inhibit or a capacity decrease
command generated by the PIC III
Press RELEASE softkey after
selecting TARGET VFD
SPEED
Motor Load
(ACTIVE DEMAND LIMIT)
MAINSTAT Automatic 40 to 100% ACTIVE DEMAND LIMIT
> Set Point + 5%
ACTIVE DEMAND LIMIT < Set
Point – 2%
Low Discharge Superheat OVERRIDE ACTUAL SUPER¬HEAT <
SUPERHEAT REQUIRED
for conditions
None ACTUAL SUPERHEAT <
SUPERHEAT REQUIRED – 0.7 K
ACTUAL SUPERHEAT >
SUPERHEAT RE
0.56 K
High Rectifier Temperature
(RECTIFIER TEMP
OVERRIDE)
SETUP1 RECTIFIER
TEMPERATURE > 71°C
68 to 77°C RECTIFIER TEMP > RECTIFIER
TEMP OV 5.6 K
RECTIFIER TEMP <
RECTIFIER TEMP
OVERRIDE – 2.8 K
High Inverter Temperature
(INVERTER TEMP
OVERRIDE)
SETUP1 INVERTER
TEMPERATURE > 71°C
68 to 77°C INVERTER TEMP > INVERTER
TEMP O 5.6 K
INVERTER TEMP <
INVERTER TEMP OVERRIDE
– 2.8 K
5.12 - Remote start/stop controls
A remote device, such as a timeclock that uses a set of con-
tacts, may be used to start and stop the chiller. However,
the device should not be programmed to start and stop the
chiller in excess of or 3 times every 1 hours. If more than 8
starts in 1 hours (the
STARTS IN 12 HOURS parameter
on the MAINSTAT screen) occur, (not counting either
recycle restarts or auto. restarts after power failure) an
excessive starts alarm displays, preventing the chiller from
starting. The operator must press the
ReSet softkey on the
ICVC to override the starts counter and start the chiller. If
the chiller records 1 starts (excluding recycle starts) in a
sliding 1-hour period, it can be restarted only by pressing
the
ReSet
softkey followed by the
LoCAL
or
CCn
soft-
key. This ensures that, if the automatic system is malfunction-
ing, the chiller will not repeatedly cycle on and off. If the
AUTO RESTART OPTION
in the OPTIONS screen and
the REMOTE CONTACTS OPTION are enabled, the
REMOTE CONTACTS must be closed in order for the
chiller to restart following a power failure. If the automatic
restart after a power failure option (AUTO RESTART
OPTION on the OPTIONS screen) is not activated when
a power failure occurs, and if the remote contact is closed,
the chiller will indicate an alarm because of the loss of
voltage.
The contacts for remote start are wired into terminals 3 and
4 of the low voltage terminal strip in the VFD enclosure.
See the certified drawings for further details on contact
ratings. The contacts must have 4 V a.c. dry contact rating.
5.13 - Spare safety and spare temperature inputs
Normally closed (NC) discrete inputs for additional field-
supplied safeties may be wired to the spare protective
limits input channel in place of the factory-installed
jumper on terminals 19 and 0 of the low voltage terminal
strip. The opening of any contact will result in a safety
shutdown and a display on the ICVC. Refer to the certified
drawings for safety contact ratings.
Extra analogue temperature sensors may also be added to
the CCM module (SPARE TEMPERATURE #1 and
SPARE TEMPERATURE #) at terminals J4 5-6 and
J4 7-8, respectively. The analogue temperature sensors may
be configured in the EQUIPMENT SERVICE/SETUP1
table to cause an alert (Enable value 1 or ) or alarm
(Enable value 3 or 4), or neither (Enable value 0). An alarm
will shut down a running chiller, but an alert will not. The
fault condition will be triggered when crossing a high limit
(Enable value or 4) or low limit (Enable value 1 or 3),
configurable between -40°C to 118°C. The spare temperature
sensors are readable on the CCN network. They also have
specific uses as common temperature sensors in a Lead/Lag
system. See page 44.
5.14 - Alarm (trip) output contacts
One set of alarm contacts is provided in the VFD. The
contact ratings are provided in the certified drawings. The
contacts are located on terminals 9 and 10 of the TB field
wiring terminal strip in the VFD enclosure.