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

The oil heater is always off during start-up or when the
compressor is running.
The oil pump is also energized during the time the oil is be-
ing heated (for 30 seconds at the end of every 30 minutes).
The oil pump will not operate if the EVAPORATOR PRES-
SURE is less than –5 psig (–34.5 kPa).
The oil must be cooled when the compres-
Oil Cooler —
sor is running. This is accomplished through a small, plate-type
heat exchanger (also called the oil cooler) located behind the
oil pump. The heat exchanger uses liquid condenser refrigerant
as the cooling liquid. Refrigerant thermostatic expansion
valves (TXVs) regulate refrigerant flow to control the oil tem-
perature entering the bearings. The bulbs for the expansion
valves are strapped to the oil supply line leaving the heat ex-
changer, and the valves are set to maintain 110 F (43 C).
NOTE: The TXVs are not adjustable. The oil sump tempera-
ture may be at a lower temperature during compressor
operations.
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, an
excessive starts alarm displays, preventing the chiller from
starting. The operator must press the
ICVC to override the starts counter and start the chiller. This
ensures that, if the automatic system is malfunctioning, the
chiller will not repeatedly cycle on and off.
If the REMOTE START OPTION is enabled, the remote
start contacts must be closed for the AUTO RESTART OPTION
(if enabled) to restart the chiller following a power failure.
Also, if the number of recycle shutdowns in a 4-hour period
exceeds five, then alert message 152 is displayed (and logged
into ALERT HISTORY) until the next required startup.
The contacts for remote start are wired into the starter at ter-
minal strip J2, terminals 5 and 6 on the ISM. See the certified
drawings for further details on contact ratings. The contacts
must have 24 vac dry contact rating.
Spare Safety and
Normally closed (NC) discrete inputs for addi-
Inputs —
tional field-supplied safeties may be wired to the spare protec-
tive limits input channel in place of the factory-installed jump-
er. (Wire multiple inputs in series.) The opening of any contact
will result in a safety shutdown and a display on the ICVC. Re-
fer 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 TEM-
PERATURE #2) at terminals J4 25-26 and J4 27-28, respec-
tively. The analog temperature sensors may be configured 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 run-
ning 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 Ap-
pendix B.
Alarm (Trip) Output Contacts —
contacts is provided in the starter. The contact ratings are pro-
vided in the certified drawings. The contacts are located on
ISM terminal strip J9, terminals 15 and 16.
Refrigerant Leak Detector —
on the CCM module [terminal J5-5 (–) and J5-6 (+)] for a
A remote device, such
softkey on the
RESET
Spare Temperature
One set of alarm
An input is available
refrigerant leak detector. Enabling REFRIGERANT LEAK OP-
TION (OPTIONS screen) will allow the PIC II controls to go
into an alarm state at a user configured level (REFRIGERANT
LEAK ALARM mA). The input is configured for 4 to 20 mA by
setting the DIP switch 1 on SW2 at the ON position, or config-
ured for 1 to 5 vdc by setting switch 1 at the OFF position. The
output of the refrigerant leak detector is displayed as REFRIG-
ERANT LEAK SENSOR on the MAINSTAT screen. For a 1 to
5 vdc input, 1 vdc input represents 4 mA displayed and 5 vdc
input represents 20 mA displayed.
Kilowatt Output —
module [Terminal J8-1 (+) and J8-2 (–)] to represent the power
consumption of the chiller if a constant speed starter is used.
The 4 to 20 mA signal generated by the CCM module can be
wired to the building automation or energy management sys-
tem to monitor the chiller's energy consumption. The output is
2 mA with the chiller off. The signal varies linearly from 4 mA
(representing 0% rated kilowatt consumption) to 20 mA (repre-
senting 100% rated kilowatt consumption). The rated peak
kilowatt consumption is configured by the user in the
RAMP_DEM display screen by the setting the MOTOR RAT-
ED KILOWATTS from the job data sheet.
Remote Reset of Alarms —
PIC II controls is the ability to reset a chiller in a shutdown
alarm state from a remote location. If the condition which
caused the alarm has cleared the chiller can be placed back into
a normal CCN operating mode when the REMOTE RESET
OPTION (ICVC_PSWD menu) is set to ENABLE. A variety
of Carrier Comfort Network
ComfortVIEW™ or Network Service Tool™ can access the
PIC II controls and reset the displayed alarm. Third party soft-
ware from building automation systems (BAS) or energy man-
agement systems (EMS) can also access the PIC II controls
through a UPC module and reset the fault displayed. Both
methods would access the ICVC_PSWD screen and force the
RESET ALARM? point to YES to reset the fault condition. If
the PIC II controls have determined that is safe to start the
chiller the CCN MODE? point (ICVC_PSWD screen) can be
forced to YES to place the chiller back into normal CCN oper-
ating mode. The only exceptions are the following alarms that
cannot be reset from a remote location: STATE numbers 100,
205, 217-220, 223, 233, 234, 247, and 250. To view alarm
codes, refer to Troubleshooting Guide, Checking Display Mes-
sages, page 99. After the alarm has been reset the PIC II control
will increment the Starts in 12 Hours counter by one upon re-
start. If the limit of 8 starts in a 12-hour period occurs, the
alarm (Alert State 100) will be required to be reset at the chiller
control panel (ICVC).
Condenser Pump Control —
tor the condenser pressure (CONDENSER PRESSURE) and
may turn on the condenser pump if the condenser pressure be-
comes too high while the compressor is shut down. The con-
denser pressure override (COND PRESS OVERRIDE) parame-
ter is used to determine this pressure point. COND PRESS
OVERRIDE is found in the SETUP1 display screen, which is
accessed from the EQUIPMENT SERVICE table. The default
value is 125 psig (862 kPa).
If the CONDENSER PRESSURE is greater than or equal to
the COND PRESS OVERRIDE, and the entering condenser
water temperature (ENTERING CONDENSER WATER) is less
than 115 F (46 C), the condenser pump will energize to try to
decrease the pressure and alert 151 will be generated. The
pump will turn off when the condenser pressure is 3.5 psi
(24.1 kPa) less than the pressure override or when the condens-
er refrigerant temperature (CONDENSER REFRIG TEMP) is
within 3 F (1.7 C) of the entering condenser water tempera-
ture (ENTERING CONDENSER WATER).
54
An output is available on the CCM
A standard feature of the
®
software systems including
The chiller will moni-