Operating Instructions; Operator Duties; Prepare The Chiller For Start-Up; To Start The Chiller - Carrier AquaEdge 23XRV Start-Up, Operation And Maintenance Instructions Manual

SAFETY DEVICES AND PROCEDURES
Electrical disconnects, relief device inspection, and handling re-
frigerant.
CHECK OPERATOR KNOWLEDGE
Start, stop, and shutdown procedures, safety and operating con-
trols, refrigerant and oil charging, and job safety.
MANUALS
The Installation Instructions, Start-Up, Operation, and Mainte-
nance Manual and the Controls and Troubleshooting Manual.
CAUTION
Manuals and notebooks should not be stored under the VFD
power module; they will block air flow into the power module
cooling fan and cause the VFD to overheat.

OPERATING INSTRUCTIONS

Operator Duties

1. Become familiar with the chiller and related equipment
before operating the chiller.
2. Prepare the system for start-up, start and stop the chiller, and
place the system in a shutdown condition.
3. Maintain a log of operating conditions and document any
abnormal readings.
4. Inspect the equipment, make routine adjustments, and per-
form appropriate Control Tests. Maintain the proper oil and
refrigerant levels.
5. Protect the system from damage during shutdown periods.
6. Maintain set point, time schedules, and other PIC6 functions.

Prepare the Chiller for Start-Up

Follow the steps described in the Initial Start-Up section, page 41.

To Start the Chiller

1. Start the liquid pumps, if they are not automatic.
2. On the main screen, press the Start Icon and select if unit is to
be started up using Local or Auto Start. If the chiller is in the
OCCUPIED mode and the start timers have expired, the start
sequence will start and the start icon will turn green.. Follow
the procedure described in the Start-Up/Shutdown/Recycle
Sequence section, page 22.
NOTE: The startup options can be configured on the Chiller
Start/Stop screen. For AutoStart either Schedule (OCCUPIED
mode), Network, or Remote Contacts can be configured. Unit will
start/stop from any of the selected sources.

Check the Running System

After the compressor starts, the operator should monitor the PIC6
HMI display and observe the parameters for normal operating
conditions. Observing values from the 23XRV Diagnostics Menu
(available from Home Screen) is particular useful for this purpose.
1. The oil sump temperature will vary from 50°F to 150°F
(10°C to 66°C) depending on the operating conditions. If the
chiller has not been running for a few hours the Oil Sump
Temp will be warmer than the EVAP SATURATED TEMP
+15°F. When the chiller is not running, the oil heater is ener-
gized whenever the Oil Sump Temp is less than the smaller of
140°F (60°C) or 53°F (29.4°C) greater than the EVAP SAT-
URATED TEMP. The Oil Sump Temp generally decreases
slowly following start-up and eventually stabilizes at a point
lower than the temperature maintained during shutdown. The
Oil Delta P increases above 18 psid (124 kPad) during start-
up and generally does not vary by more than ± 2 psid
(14 kPad). The level in the oil sump is generally very stable.
Changes in the oil level occur very slowly.
2. When the compressor is running, the liquid level should be
visible in the oil sump or the strainer housing sight glass. Low
oil pressure alarms are imminent if the oil level drops below
the bottom of the oil strainer housing sight glass.
3. The Oil Delta P displayed on the PIC6 Main screen is equal
to the difference between the oil pressure leaving the oil filter
and the oil sump pressure transducer readings. Typically the
reading will be between 20 and 28 psid (138 and 193 kPad)
after the oil pressure ramp up is complete.
4. The moisture indicator (dry-eye) sight glass on the refrigerant
motor cooling line should indicate refrigerant flow and a dry
condition.
5. The condenser pressure and temperature varies with the
chiller design conditions. Typically the pressure will range
between 60 and 135 psig (329 and 780 kPa) with a corre-
sponding temperature range of 60 to 105°F (15 to 41°C). The
condenser entering liquid temperature may be controlled
below the specified design entering liquid temperature to save
on compressor kilowatt requirements but not be below 55°F
(12.8°C).
6. Cooler pressure and temperature also will vary with the
design conditions. Typical pressure range will be between 30
and 40 psig (204 and 260 kPa) with temperature ranging
between 34 and 45°F (1 and 8°C).
7. The compressor may operate at full capacity for a short time
after the pulldown ramping has ended, even though the build-
ing load is small. The active electrical demand setting can be
overridden to limit the compressor kW, or the pulldown rate
can be decreased to avoid a high demand charge for the short
period of high demand operation. Pulldown rate can be based
on load rate or temperature rate. Pulldown ramp rate is con-
figured in General Configuration Menu (Fig. 46).
Fig. 46 — General Configuration Menu

To Stop the Chiller

1. The occupancy schedule starts and stops the chiller automati-
cally once the time schedule is configured.
2. The unit can be stopped manually using the HMI by pressing
the Disable Unit icon under the Chiller Start/Stop Menu.
After the icon is pressed the unit will start the shutdown
sequence.
IMPORTANT: Do not attempt to stop the chiller by opening
an isolating knife switch. High intensity arcing may occur.
Do not restart the chiller until the problem is diagnosed and
corrected.
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