Carrier PIC 5+ - Installation Requirements

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Marine chillers are a little different from common chillers,
and have a few new functions.
5.37.1 - Oil Stir
If ”Factory Parameters” -> ”Marine Option” is enabled, when
chiller is not running, the oil pump will be switched on for
30 seconds every 3 hours, no matter oil heater is on or off.
When oir stir is in progress, oil heater will be switched off.
5.37.2 - Power Request
If ”Factory Parameters” -> ”Power Request Option” is
enabled, when chiller is starting up, it will send power request
signal and alert 104 while verifying water ow. After it
receives the permission to start feedback, the start up will
proceed. The power request signal will remain active till the
compressor is switched on. If there is still no permission to
start feedback 5 minutes after power request is sent, or
permission to start feedback is deactivated before compressor
is switched on, the start up process will terminate and trigger
an alarm.
If ”Factory Parameters” -> ”Cont Power Request Opt” is
enabled, the power request signal will remain active after the
compressor is switched on. If permission to start feedback is
deactivated while compressor is running, an alarm shutdown
will be triggered.
5.37.3 - Evaporator Approach Calculation
If ”Option Conguration” -> ”Evap App Calc Selection” is
set to Sat Temp, evaporator approach will be caclulated from
evaporator leaving water temperature and evaporator
saturated temperature.
If this option is set to Ref Temp, evaporator approach will
be caclulated from evaporator leaving water temperature
and evaporator refrigerant temperature.
5.37.4 - Evaporator Liquid Temperature Calculation
If ”Option Conguration” -> ”Evap Liquid Temp Opt” is set
to Enable, the controller will read evaporator liquid
temperature from evaporator temperature transducer.
If this option is set to Dsable, evaporator liquid temperature
will be calculated from evaporator pressure transducer.
5.37.5 - Free Cooling
If ”Factory Parameters” -> ”Free Cooling Option” is enabled,
any one of the following will make the chiller start free cooling:
- Enable ”General Parameters” -> “Start Free Cooling”
- In Network Mode, Enable ”General Parameters” ->
“Start Free Cooling” from CCN or BACNet.
- Free Cooling Start Switch contact is closed.
When free cooling is in progress, the chiller will take these
actions:
- Switch on evaporator and condenser water pump
- Open head pressure valve to maximum opening position
- Open guide vane to maximum opening position
- Activate free cooling mode output contact.
- Display Free Cooling mode on the homepage.
Free cooling mode will only be activated when chiller is not
running. If the chiller is running, free cooling start request
will be ignored. When free cooling is in progress, chiller is
not able to start up.
5.37.6 - Condenser Flushing
To prevent the chiller being corroded after left unused for a long
time, it is suggested to ush the condenser once every week.
If ”Option Conguration” -> ”Condenser Flush Alert” is
enabled, when condenser pump has been not running for 7
days, alert 166 will be triggered to remind user to flush
condenser. Then user can activate condenser ush by enabling
”General Parameters” -> “Start Condenser Flush”. Alert 166
will be reset automatically after condenser ush is activated.
Condenser Flush will last for 2 hours and then automatically
end. During Condenser Flush, the chiller will take these actions:
- Switch on the condenser water pump
- Open head pressure valve to maximum opening position
- Display Condenser Flush mode on the homepage.
Condenser Flush mode will only be activated when chiller is
not running. If the chiller is running, Condenser Flush start
request will be ignored. When free cooling is in progress, if
chiller is commanded to start, condenser flush will
automatically end and chiller will normally start up.
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Ethernet connector and CCN connector on PIC 5+ controller
can be congured to be a Modbus connector from software
version 3.2 with the following steps:
• Step 1: Conguration Menu ->Network Conguration,
Modbus Option set to Enable
• Step 2: Modbus Server Type set to 0(IP), Ethernet
connector will be the Modbus connector; Set to 1(RS485),
CCN connector will be the Modbus connector.
• Step 3: Wait 40s, controller will reboot automatically to
save the conguration change.
Even if ethernet connector is congured to be the extended
Modbus connector, it still can be congured to Bacnet with
Bacnet dongle installed and Bacnet option set to enable.
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19DV equipped with purge control because the refrigerant
working with low pressure.
Purge Control can be active (when Purge Inlet Temperature
is greater than Purge Active Temperature Setpoint) or forced
ON whenever chiller compressor is ON or chiller is OFF
with Purge On Idle Option enable.
There will be 3 minutes delay after purge control is active. If
purge control is forced or 3 minutes delay is expired, the
system will purge refrigerant form condenser when chiller
compressor is running or from compressor when chiller
compressor is not running.
When Purge Compressor Suction Temp is less than 6F and
purge level switch low is off, the system start to vacuum for
about10s. After that the system shall start 20s delay and then
check Purge Compressor Inlet Temp again.
When refrigerant level in purge tank is high or Purge
Compressor Suction Temp is less than 12F and purge level
switch low is on, then drainage will be enable to drain
refrigerant from purge tank until refrigerant level is low.
Purge Drainage Valve will be ON to drain refrigerant from purge
tank to evaporator regardless compressor is running or not