Carrier PIC 5+, Installation, Operation And Maintenance Instructions

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NOTE: The dry contacts for the field inputs should be located as close to the unit as possible. The field wiring
should be capable of preventing electrical noise or induced voltage and should not be routed with any wires with
voltage over 50 v.
3.6.1 CONNECT CONTROL INPUTS
Wiring may be specified for a spare safety switch, and a remote start/stop contact can be wired to the terminal
strip. Additional spare sensors and control modules may be specified as well. Carrier Comfort Network® (CCN)
communication is wired to the machine HMI panel.
Wiring may be specified for a remote start/stop contact, a remote emergency stop contact, an ice build contact, a
spare safety switch, a power request feedback switch, a cooler water flow switch and a condenser water flow
switch can be wired to the control panel field terminal strip. Additional spare sensors may be specified for auto
demand limit input, refrigerant leak sensor, common CHWS temperature sensor, auto water temp reset and
common CHWR temp sensor can be wired to the control panel field terminal strips as well. These are wired to the
machine control panel. See electrical wiring diagrams.
3.6.2 CONNECT CONTROL OUTPUTS
Wiring maybe specified for a chiller alarm relay, a free cooling mode relay and a power request relay can be wired
to the control panel field terminal strip. Additional analog output signals may be specified for chiller running status
(on/off/ready) and head pressure output can be wired to the control panel field terminal strips as well. These are
wired to the machine control panel. See electrical wiring diagrams.
IOB1 BLOCK
Terminal
#
Point Description Point name
Designation for
wiring diagram
Comments
AI1 J16 1-5
Entering chilled water
temperature
ECW RT1
AI2 J16 2-6
Leaving chilled water
temperature
LCW RT2
AI3 J16 3-7
Entering condenser water
temperature
ECDW RT7
AI4 J16 4-8
Leaving condenser water
temperature
LCDW RT8
AI5 J15 6-12
Evap. refrigerant liquid
temperature
EVAP_T RT15
AI6 J15 5-11 Comp Discharge temperature DGT RT21
AI7 J15 4-10 Condenser pressure COND_P BP1
AI8 J15 3-9 Evaporator pressure EVAP_P BP3
AI9 J15 2-8
AI10 J15 1-7 FS VFD Load current VFDC_MA -
For freestanding VFD option - customer
terminals
AI11 J10 1-7
AO1 J14 1-4 Chiller Status Output mA CHST_OUT Chiller status used in std
AO2 J14 2-5
AO3 J14 3-6
DI1 J13 1-5 Evap Water Flow Switch EVAP_FS -
User option, dry contact "Closed"
indicates "Flow" / not connected in std
DI2 J13 2-6 Cond Water Flow Switch COND_FS -
User option, dry contact "Closed"
indicates "Flow" / not connected in std
DI3 J13 3-7 Remote contact input REM_CON Remote on/off
User option, dry contact "Closed"
indicates Turn ON chiller
DI4 J13 4-8 Remote emergency stop input E_STOP
Remote emergency
stop
User option, dry contact "Closed"
indicates Chiller Emergency stop
DO1 J12 6-7 Economizer bypass valve ECBY_VLV EBPV Factory option
DO2 J12 9-10 Refrigerant Pump REF_PUMP KM1233
DO3 J12 1-2 Chiller Alarm Relay ALM K112
DO4 J12 4-5 Vapor Venting Line SV VAPL_SV - not used / special
IOB2 BLOCK
Terminal
#
Point Description Point name
Designation for
wiring diagram
Comments
AI1 J16 1-5 Motor winding temperature 1 MTRW1 RT31C
AI2 J16 2-6
AI3 J16 3-7 EC valve feedback Ma HGBP_MA Y11 13-14 factory option / 4 - 20 mA
AI4 J16 4-8
AI5 J15 6-12 Pump Outlet Pressure PUMPO_P BP81
AI6 J15 5-11 Bearing Outlet pressure BRGO_P BP71