Remote Start/Stop Controls; Spare Safety And Spare Temperature Inputs; Alarm (Trip) Output Contacts - Carrier 19XRV Start-Up, Operation And Maintenance Instructions Manual

OVERRIDE
View/Modify on
CONDITION
High Condenser Pressure
(COND PRESS OVERRIDE)
High Motor Temperature
(COMP MOTOR TEMP
OVERRIDE)
Low Evaporator Temperature
(REFRIG OVERRIDE
DELTA T)
High Compressor Lift
(SURGE/HGBP DELTA T,P)
Manual Guide Vane Target
(TARGET GUIDE VANE POS)
Manual Speed Control
(TARGET VFD SPEED)
Motor Load
(ACTIVE DEMAND LIMIT)
Low Discharge Superheat
High Rectifier Temperature
(RECTIFIER TEMP
OVERRIDE)
High Inverter Temperature
(INVERTER TEMP
OVERRIDE)
Remote Start/Stop Controls —
as a timeclock that uses a set of contacts, may be used to start
and stop the chiller. However, the device should not be pro-
grammed to start and stop the chiller in excess of 2 or 3 times
every 12 hours. If more than 8 starts in 12 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
softkey on the ICVC to override the starts counter and start the
chiller. If the chiller records 12 starts (excluding recycle starts)
in a sliding 12-hour period, it can be restarted only by pressing
the softkey followed by the
RESET
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 23 and
24 of the low voltage terminal strip in the VFD enclosure. See
Table 7 — Capacity Overrides Table
FIRST STAGE SET POINT
Override Default
ICVC Screen Value
CONDENSER
SETUP1 PRESSURE
>125 psig (862 kPa)
COMP MOTOR
SETUP1 WINDING TEMP
> 200 F (93 C)
EVAPORATOR
REFRIG TEMP
SETUP1 < EVAP REFRIG
TRIPPOINT + 3 F
(1.7 C)
Min T1: 1.5 F (0.8 C)
Min P1: 50 psid
(345 kPa)
OPTIONS
Max T2: 10 F (5.6 C)
Max P2: 85 psid
(586 kPad)
COMPRESS Automatic
COMPRESS Automatic
MAINSTAT Automatic
ACTUAL SUPER-
HEAT < SUPERHEAT
OVERRIDE
REQUIRED for
conditions
RECTIFIER
SETUP1 TEMPERATURE >
160 F (71 C)
INVERTER
SETUP1 TEMPERATURE >
160 F (71 C)
A remote device, such
RESET
or
LOCAL CCN
SECOND STAGE SET POINT
Configurable
Range
CONDENSER PRESSURE
90 to 165 psig
> COND PRESS OVERRIDE
(621 to 1138 kPa)
+ 2.4 psig (16.5 kPA)
COMP MOTOR WINDING TEMP
150 to 200 F
> COMP MOTOR TEMP OVER-
(66 to 93 C)
RIDE + 10 F (5.6 C)
EVAPORATOR REFRIG TEMP
< EVAP REF OVERRIDE TEMP
- 1 F (.6 C)
2 to 5 F
NOTE: EVAP REF OVERRIDE
(1.1 to 2.8 C)
TEMP = EVAP REFRIG TRIP-
POINT + REFRIG OVERRIDE
DELTA T
0.5 - 2.0 F
(0.3 - 1.1 C)
30 - 170 psid
(207 - 1172 kPad)
None
0.5 - 20 F
(0.3 - 11.1 C)
50 - 170 psid
(345 - 1172 kPad)
0 to 100% None
Forced TARGET VFD SPEED
cannot override either a
VFD MINIMUM
capacity inhibit or a capacity
SPEED to 100%
decrease command generated by
the PIC III
ACTIVE DEMAND LIMIT
40 to 100%
> Set Point + 5%
ACTUAL SUPERHEAT
None < SUPERHEAT REQUIRED
– 1.25 F (0.7 C)
RECTIFIER TEMP
155 to 170 F
> RECTIFIER TEMP OVERRIDE
(68 to 77 C)
+ 10 F (5.6 C)
INVERTER TEMP
155 to 170 F
> INVERTER TEMP OVERRIDE
(68 to 77 C)
+ 10 F (5.6 C)
the certified drawings for further details on contact ratings. The
contacts must have 24 vac dry contact rating.
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 20 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 analog temperature sensors may also be added to the
CCM module (SPARE TEMPERATURE #1 and SPARE
TEMPERATURE #2) at terminals J4 25-26 and J4 27-28,
respectively. The analog temperature sensors may be config-
soft-
ured in the EQUIPMENT SERVICE/SETUP1 table to cause
an alert (Enable value 1 or 2) 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 2 or 4) or
low limit (Enable value 1 or 3), configurable between –40 F to
245 F (–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 47.
Alarm (Trip) Output Contacts —
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 TB2 field wiring terminal strip in the
VFD enclosure.
43
OVERRIDE TERMINATION
Value Value
CONDENSER PRESSURE
< CONDENSER PRESS
OVERRIDE – 1 PSI (6.9 kPa)
COMPR MOTOR WINDING
TEMP < COMP MOTOR TEMP
OVERRIDE – 2 F (1.1 C)
EVAP REFRIG TEMP
> EVAP REF OVERRIDE TEMP
+ 2 F (1.1 C)
ACTIVE DELTA T > SURGE/
HGBP DELTA T + SURGE/HGBP
DEADBAND
Press RELEASE softkey after
selecting TARGET GUIDE VANE
POS
Press RELEASE softkey after
selecting TARGET VFD SPEED
ACTIVE DEMAND LIMIT
< Set Point – 2%
ACTUAL SUPERHEAT
> SUPERHEAT REQUIRED
+ 1 F (0.56 C)
RECTIFIER TEMP
< RECTIFIER TEMP OVERRIDE
– 5 F (2.8 C)
INVERTER TEMP
< INVERTER TEMP OVERRIDE
– 5 F (2.8 C)
One set of alarm