Carrier XRV Especificações descarregar pdf (Página 78)

Check Oil Pressure and Compressor Stop

1. When the motor is at full speed, note the OIL PRES-

SURE reading on the ICVC default screen. Normal

19XRV oil pressure readings are between 18 and 30 psid

(124 to 207 kPad). The oil pressure should be between 18

and 40 psid (124 to 276 kPad) on Frame 3 compressors

equipped with rolling element bearings.

2. Press the Stop button and listen for any unusual sounds

from the compressor as it coasts to a stop.

To Prevent Accidental Start-Up — A chiller STOP

override setting may be entered to prevent accidental start-up

during service or whenever necessary. Access the MAINSTAT

screen and using the or softkeys,

highlight the CHILLER START/STOP parameter. Override the

current START value by pressing the softkey. Press

the softkey followed by the softkey. The

word SUPVSR! displays on the ICVC indicating the override

is in place.

To restart the chiller, the STOP override setting must be

removed. Access the MAINSTAT screen and using

or softkeys highlight CHILLER START/STOP.

The 3 softkeys that appear represent 3 choices:

• — forces the chiller ON

• — forces the chiller OFF

• — puts the chiller under remote or schedule

control

To return the chiller to normal control, press the

softkey followed by the softkey. For

more information, see Local Start-Up, page 57.

The default ICVC screen message line indicates which

command is in effect.

Check Chiller Operating Condition — Check to be

sure that chiller temperatures, pressures, water flows, and oil and

refrigerant levels indicate the system is functioning properly.

Instruct the Customer Operator — Ensure the op-

erator(s) understand all operating and maintenance procedures.

Point out the various chiller parts and explain their function as

part of the complete system.

COOLER-CONDENSER — Float chamber, relief valves,

refrigerant charging valve, temperature sensor locations, pres-

sure transducer locations, Schrader fittings, waterboxes and

tubes, and vents and drains.

OPTIONAL PUMPOUT STORAGE TANK AND PUMP-

OUT SYSTEM — Transfer valves and pumpout system,

refrigerant charging and pumpdown procedure, and relief

devices.

MOTOR COMPRESSOR ASSEMBLY — Guide vane actu-

ator, transmission, motor cooling system, oil cooling system,

temperature and pressure sensors, oil sight glasses, integral oil

pump, isolatable oil filter, extra oil and motor temperature

sensors, synthetic oil, and compressor serviceability.

MOTOR COMPRESSOR LUBRICATION SYSTEM —

Oil pump, cooler filter, oil heater, oil charge and specification,

operating and shutdown oil level, temperature and pressure,

and oil charging connections.

CONTROL SYSTEM — CCN and LOCAL start, reset,

menu, softkey functions, ICVC operation, occupancy schedule,

set points, safety controls, and auxiliary and optional controls.

AUXILIARY EQUIPMENT — Disconnects, separate elec-

trical sources, pumps, and cooling tower.

DESCRIBE CHILLER CYCLES — Refrigerant, motor cool-

ing, lubrication, and oil reclaim.

REVIEW MAINTENANCE — Scheduled, routine, and ex-

tended shutdowns, importance of a log sheet, importance of

water treatment and tube cleaning, and importance of maintain-

ing a leak-free chiller.

SAFETY DEVICES AND PROCEDURES — Electrical dis-

connects, relief device inspection, and handling refrigerant.

CHECK OPERATOR KNOWLEDGE — Start, stop, and

shutdown procedures, safety and operating controls, refrigerant

and oil charging, and job safety.

REVIEW THE START-UP OPERATION, AND MAINTE-

NANCE MANUAL

NOTE: Manuals and notebooks should not be stored under the

VFD power module as they will block airflow into the power

module cooling fan. Remove the manuals if they were placed

under the power module during shipping.

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

perform a Control Test. Maintain the proper oil and

refrigerant levels.

5. Protect the system from damage during shutdown periods.

6. Maintain the set point, time schedules, and other PIC III

functions.

Prepare the Chiller for Start-Up — Follow the steps

described in the Initial Start-Up section, page 77.

To Start the Chiller

1. Start the water pumps, if they are not automatic.

2. On the ICVC default screen, press the or

softkey to start the system. If the chiller is in the

OCCUPIED mode and the start timers have expired, the

start sequence will start. Follow the procedure described

in the Start-Up/Shutdown/Recycle Sequence section,

page 57.

Check the Running System — After the compres-

sor starts, the operator should monitor the ICVC display and

observe the parameters for normal operating conditions:

1. The oil reservoir temperature should be above 120 F

(49 C) during shutdown.

2. The bearing oil temperature accessed on the COMPRESS

table should be 120 to 165 F (49 to 74 C) for compressors

using journal bearings, and up to 175 F (79 C) for Frame

3 compressors equipped with rolling element bearings. If

the bearing temperature reads more than 180 F (83 C)

with the oil pump running, stop the chiller and determine

the cause of the high temperature. Do not restart the

chiller until corrected.

3. The oil level should be visible anywhere in one of the two

sight glasses. Foaming oil is acceptable as long as the oil

pressure and temperature are within limits.

4. The OIL PRESSURE should be between 18 and 30 psid

(124 to 207 kPad) differential, as seen on the ICVC

default screen. Typically the reading will be 18 to 25 psid

(124 to 172 kPad) at initial start-up. Typical values may

SELECT

STOP

ENTER

START

STOP

RELEASE

ENTER

LOCAL

CCN

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