Lubrication Control; Shutdown - Carrier AquaEdge 19XR Start-Up, Operation And Maintenance Instructions Manual

PIC 5 control system closes the vanes. If the vanes are closed
and the oil pump pressure is less than 4 psi (27.6 kPa), the oil
pump relay energizes. The PIC 5 control system then waits un-
til the oil pressure (OIL PRESS VERIFY TIME, operator-con-
figured, default of 40 seconds) reaches a maximum of 18 psi
(124 kPa). After oil pressure is verified, the PIC control system
waits 40 seconds, and the compressor start relay (1CR) ener-
gizes to start the compressor. Compressor ontime and service
ontime timers start, and the compressor STARTS IN 12 HOURS
counter and the number of starts over a 12-hour period counter
advance by one.
Failure to verify any of the requirements up to this point will result
in the PIC 5 control system aborting the start and displaying the
applicable pre-start alert alarm state number near the bottom of the
home screen on the HMI panel. A prestart failure does not ad-
vance the STARTS IN 12 HOURS counter. Any failure after the
1CR relay has energized results in a safety shutdown, advances
the starts in 12 hours counter by one, and displays the applicable
shutdown status on the display.
The minimum time to complete the entire prestart sequence is
approximately 185 seconds. See Fig. 8 for normal start-up tim-
ing sequence. See Table 2 for a list of prestart checks.

Lubrication Control

As part of the prestart checks executed by the controls, the oil
sump temperature is compared to the evaporator saturated re-
frigerant temperature. If the oil temperature is less than 140F
(60C) and less than evaporator saturated refrigerant tempera-
ture plus 50°F (27.8°C), the start-up will be delayed until either
of these conditions is no longer true. Once this temperature is
confirmed, the start-up continues.
The oil heater relay is energized whenever the chiller compressor
is off and the oil sump temperature is less than 140F (60C) or the
oil sump temperature is less than the evaporator saturated refriger-
ant temperature plus 53°F (29.4°C). The oil heater is turned off
when either of the following conditions is true:
• Oil sump temperature is more than 152F (66.7C)
• Oil sump temperature is more than 144F (62.2C) and
more than the evaporator saturated refrigerant temperature
plus 55°F (30.6°C)
The oil heater is always off when the compressor is running.
The oil pump is also energized for 30 seconds after each 30
minutes of oil heat relay being energized in order to stir the oil
for more evenly distributed heating.
Table 2 — Prestart Checks
PRESTART CHECK CONDITION*
STARTS IN 12 HOURS 8 (not counting recycle restarts or auto
restarts after power failure)
OIL SUMP TEMP 140°F (60°C) and OIL SUMP TEMP EVAP_-
SAT + 50°F (27.8°C)
COND PRESSURE COND PRESS OVERRIDE – 20 psi
#RECYCLE RESTARTS LAST 4 HOURS > 5
COMP BEARING TEMPS COMP BEARING ALERT– 10°F
(5.6°C)
COMP MOTOR WINDING TEMP COMP MOTOR WINDING–
10°F (5.6°C)
COMP DISCHARGE TEMPERATURE COMP DISCHARGE
ALERT– 10°F (5.6°C)
EVAP_SAT <Evap trip point** + EVAP OVERRIDE DELTA T
EVAP REFRIG LIQUID TEMP <Evap trip point** + EVAP OVER-
RIDE DELTA T
AVERAGE LINE VOLTAGE UNDERVOLTAGE THRESHOLD
AVERAGE LINE VOLTAGE OVERVOLTAGE
THRESHOLD
CHECK FOR GUIDE VANE CALIBRATION
* If Prestart Check Condition is True, then resulting State is as indicated in the
State Number column.
† See the Controls Operation and Troubleshooting guide for alarm and alert
codes.
** Evap trip point = 33 F (0.6 C) (water) or EVAP REFRIG TRIPPOINT (brine)
A — START INITIATED: Pre-start checks are made; evaporator pump
started.*
B — Condenser water pump started (5 seconds after A).
C — Water flows verified (30 seconds to 5 minutes maximum after B).
Chilled water temperatures checked against control point. Guide
vanes checked for closure. Oil pump started; tower fan control
enabled.
D — Oil pressure verified (15 seconds minimum, 300 seconds maximum
after C).
E — Compressor motor starts; compressor ontime and service ontime
start, 15-minute inhibit timer starts (10 seconds after D), total com-
pressor starts advances by one, and the number of starts over a
12-hour period advances by one.
F — SHUTDOWN INITIATED — Compressor motor stops; compressor
ontime and service ontime stop, and 1-minute inhibit timer starts.
G — Oil pump and evaporator pumps de-energized (60 seconds after F).
Condenser pump and tower fan control may continue to operate if
condenser pressure is high. Evaporator pump may continue if in
RECYCLE mode.
O/A — Restart permitted (both inhibit timers expired: minimum of 15 min-
utes after E; minimum of 1 minute after F).
*
Auto Restart After Power Failure Timing sequence will be faster.
Fig. 8 — Control Timing Sequence

Shutdown

The unit can be stopped locally using the HMI by pressing the
green Start/Stop icon
played. Press Confirm Stop (see Fig. 9).
STATE
†
NUMBER
Alert – 100
Alert – 101
Alert – 102
Alert – 103
Alarm – 230
Alarm – 231
Alarm – 232
Alarm – 233
Alarm – 233
Alarm – 234
Alarm – 235
Alarm – 236
12
C D E
A B
for Normal Start-Up
. The Unit Start/Stop screen is dis-
Unit Start/Stop
Fig. 9 — Confirm Stop
G O/A
F