Carrier 23XL Especificações descarregar pdf (Página 56)

Table 9 — Refrigerant Charges

COOLER SIZE ECONOMIZER

REFRIGERANT

HCFC-22 HFC-134a

lb kg lb kg

10,11

NO 600 272 * *

YES 650 295 * *

20,21

NO 700 318 * *

YES 750 340 * *

NO 900 408 800 363

YES 1000 454 850 386

NO 1000 454 850 386

YES 1100 499 900 408

NO 1100 499 900 408

YES 1200 544 950 431

NO 1200 544 950 431

YES 1300 590 1000 454

*Not available or retroﬁtable when using HFC-134a.

TRIMMING REFRIGERANT CHARGE — The 23XL is

shipped with the correct charge for the design duty of the

machine. Trimming the charge can be best accomplished when

design load is available. To trim, check the temperature dif-

ference between leaving chilled water temperature and cooler

refrigerant temperature at full load design conditions. If nec-

essary, add or remove refrigerant to bring the temperature

difference to design conditions or minimum differential. Do

not overcharge.

INITIAL START-UP

Preparation —

Before starting the machine, check to en-

sure that the:

1. Power is on to the main starter, tower fan starter, oil heater

relay (Frame 1 and 2 machines), and the machine control

center.

2. Cooling tower water is at proper level, above 55 F

(12.8 C) but at or below design entering temperature.

3. Machine is charged with refrigerant and all refrigerant

and oil valves are in their proper operating position.

4. Oil is at the proper level in the oil sump sight glass.

5. Oil temperature is above cooler or refrigerant tempera-

ture plus 35° F (19° C) on Frame 1 and 2 machines only.

6. Valves in the evaporator and condenser water circuits are

open.

NOTE: If pumps are not automatic, make sure water is

circulating properly.

7. Solid-state starter checks: The Power +15 and the Phase

Correct LEDs must be lit before the starter will energize.

If the Power +15 LED is not on, incoming voltage is not

present or is incorrect. If the Phase Correct LED is not

lit, rotate any 2 incoming phases to correct the phasing.

Do not permit water or brine that is warmer than 110 F

(43 C) to ﬂow through the cooler or condenser. Refrig-

erant overpressure may discharge through the relief de-

vices and result in the loss of refrigerant charge.

8. Press RELEASE to automate the chiller start/stop value

on the Status01 table to enable the chiller to start. The

initial factory setting of this value is overridden to stop in

order to prevent accidental start-up.

Dry Run to Test Start-Up Sequence

1. Disengage the main motor disconnect on the starter front

panel. This should only disconnect the motor power. Power

to the controls, and starter control circuit should still be

energized.

2. Look at the default screen on the LID: the Status mes-

sage in the upper left-hand corner will show that the ma-

chine is in the OCCUPIED mode and is ready to

start. If not, go to the Schedule menu and override the

schedule or change the occupied time. Press the

LOCAL

softkey to begin the start-up sequences.

3. Check that chilled water and condenser water pumps

energize.

4. After approximately 3 minutes, the starter will be ener-

gized and go through its start-up sequence.

5. Check the main contactor for proper operation.

6. The PIC will eventually show an alarm for motor amps

not sensed. Reset this alarm and continue with the initial

start-up.

Check Rotation

1. Engage the main motor disconnect on the front of the starter

panel. The motor is now ready for a rotation check.

2. After the default screen primary Status message states

‘‘READY TO START,’’press the LOCAL

softkey. Start-up

checks will be made by the control.

3. When the starter is energized and the motor begins to turn

over, check the default screen Status messages.

If rotation is not proper, the primary Status message states

‘‘FAILURE TO START’’ and ‘‘MOTOR WIRING INCOR-

RECT’’ is displayed for the secondary Status message. Re-

verse any 2 of the 3 incoming power leads to the starter and

recheck rotation.

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 103 104

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