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

Table 7 -- Capacity Overrides Table
FIRST STAGE SET POINT SECOND STAGE SET POINT OVERRIDE TERMINATION
OVERRIDE
CONDITION View/Modify on Override Default Configurable Value Value
ICVC Screen Value Range
CONDENSER CONDENSER PRESSURE CONDENSER PRESSURE
High Condenser Pressure SETUP1 PRESSURE 90 to 165 psig > COND PRESS OVERRIDE < CONDENSER PRESS
(COND PRESS OVERRIDE) >125 psig (862 kPa) (621 to 1138 kPa) + 2.4 psig (16.5 kPA) OVERRIDE - 1 PSI (6.9 kPa)
High Motor Temperature COMP MOTOR 150 to 200 F COMP MOTOR WINDING TEMP COMPR MOTOR WINDING
(COMP MOTOR TEMP SETUP1 WINDING TEMP > COMP MOTOR TEMP OVER- TEMP < COMP MOTOR TEMP
OVERRIDE) > 2OO F (93 C) (66 to 93 C) RIDE + 10 F (5.6 C) OVERRIDE- 2 F (1.1 C)
EVAPORATOR REFRIG TEMP
EVAPORATOR < EVAP REF OVERRIDE TEMP
Low Evaporator Temperature REFRIG TEMP 2 to 5 F - 1 F (.6 C) EVAP REFRIG TEMP
(REFRIG OVERRIDE SETUP1 < EVAP REFRIG (1.1 to 2.8 C) NOTE: EVAP REF OVERRIDE > EVAP REF OVERRIDE TEMP
DELTA T) TRIPPOINT + 3 F TEMP = EVAP REFRIG TRIP- +2F(1.1C)
(1.7 C) POINT + REFRIG OVERRIDE
DELTA T
Min TI: 1.5 F (0.8 C) 0.5 - 2.0 F
(0.3- 1.1 C)
Min PI: 50 psid 30 - 170 psid ACTIVE DELTA T > SURGE/
High Compressor Lift OPTIONS (345 kPa) (207 - 1172 kPad) None HGBP DELTA T + SURGE/HGBP
(SURGE/HGBP DELTA T,P) Max T2:10 F (5.6 C) 0.5 - 20 F DEADBAND
(0.3- 11,1 C)
Max P2:85 psid 50 - 170 psid
(586 kPad) (345 - 1172 kPad)
Manual Guide Vane Target Press RELEASE softkey after
(TARGET GUIDE VANE POS) COMPRESS Automatic 0 to 100% None selecting TARGET GUIDE VANE
POS
Forced TARGET VFD SPEED
Manual Speed Control VFD MINIMUM cannot override either a Press RELEASE softkey after
capacity inhibit or a capacity selecting TARGET VFD SPEED
(TARGET VFD SPEED) COMPRESS Automatic SPEED to 100% decrease command generated by
the PIC III
Motor Load MAINSTAT Automatic 40 to 100% ACTIVE DEMAND LIMIT ACTIVE DEMAND LIMIT
(ACTIVE DEMAND LIMIT) > Set Point + 5% < Set Point - 2%
ACTUAL SUPER-
ACTUAL SUPERHEAT ACTUAL SUPERHEAT
HEAT< SUPERHEAT None < SUPERHEAT REQUIRED > SUPERHEAT REQUIRED
Low Discharge Superheat OVERRIDE REQUIRED for
conditions - 1.25 F (0,7 C) + 1 F (0.56 C)
High Rectifier Temperature RECTIFIER 155 to 170 F RECTIFIER TEMP RECTIFIER TEMP
(RECTIFIER TEMP SETUP1 TEMPERATURE> (66 to 77 C) > RECTIFIER TEMP OVERRIDE < RECTIFIER TEMP OVERRIDE
OVERRIDE) 160 F (71 C) + 10 F (5,6 C) - 5 F (2.8 C)
High Inverter Temperature INVERTER 155 to 170 F INVERTER TEMP INVERTER TEMP
(INVERTER TEMP SETUP1 TEMPERATURE > > INVERTER TEMP OVERRIDE < INVERTER TEMP OVERRIDE
OVERRIDE) 160 F(71 C) (66 to 77 C) + 10 F(5,6C) -5 F(2.8C)
Remote Start/Stop Controls -- A
remote device, such
as a timeclock that uses a set of contacts, may be used to stmt
and stop the chillel: Howevel; the device should not be pro-
gmmmed to st_ut and stop file chiller in excess of 2 or 3 times
every 12 hours. If more than 8 st_uts in 12 hom_ (the STARTS
IN 12 HOURS parmneter on the MAINSTAT screen) occur.
(not counting either lecycle restmts or auto restarts after power
failure) an excessive starts alarm displays, preventing the
chiller from starting. Tile operator must press the
softkey on the ICVC to override the starts counter and start the
chillel: If the chiller records 12 starts (excluding recycle starts)
in a sliding 12-hour period, it can be lestarted only by pressing
the _ softkey followed by the _ or _ soft-
key. This ensures that, if the automatic system is m_dfunction-
ing, the chiller will not repeatedly cycle on and off. If the
AUTORESTART OPTION in the OPTIONS scieen and the
REMOTE CONTACTS OPTION are enabled, the REMOTE
CONTRACTS must be closed in order for the chiller to lest_ut
following a power failure. If the automatic restmt after a power
failure option (AUTO RESTART OPTION on file OPTIONS
screen) is not activated when a power failure occurs, and if the
remote contact is closed, the chiller will indicate an _darm
because of the loss of voltage.
The contacts for remote start are wired into terminals 23 trod
24 of the low voltage terminal strip in the VFD enclosure. See
the certified drawings for further details on contact ratings. The
contacts must have 24 vac dry contact rating.
Spare Safety and Spare Temperature Inputs --
Norln_dly closed (NC) discrete inputs for addition_d 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 tiny contact will result in a safety shutdown and a
display on the ICVC. Refer to the certified drawings for safety
contact ratings.
Extra amdog telnperature sensors may also be added to the
CCM module (SPARE TEMPERATURE #l and SPARE
TEMPERATURE #2) at terminals J4 25-26 and J4 27-28,
respectively. The analog temperature sensors may be config-
ured in the EQUIPMENT SERVICE/SETUPI table to cause
an alert (Enable value l or 2) or almm (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 l or 3), configurable between -40 F to
245 F (-40 C to 118 C). The spare temperature sensors are
readable on the CCN netwoN. They also have specific uses
as common temperature sensors in a Lead/Lag system (see
page 44).
Alarm (Trip) Output Contacts
-- One set of alarm
contacts is provided in file stmlel: The contact ratings are
provided in the certified drawings. The contacts are located on
terminals 9 and l0 of the TB2 field wiring terminal strip in the
VFD enclosure.
4O