Carrier 23XL Especificações descarregar pdf (Página 58)

OPERATING INSTRUCTIONS

Operator Duties

1. Become familiar with refrigeration machine and related

equipment before operating the machine.

2. Prepare the system for start-up, start and stop the ma-

chine, and place the system in a shutdown condition.

3. Maintain a log of operating conditions and recognize any

abnormal readings.

4. Inspect the equipment, make routine adjustments, and per-

form a Control Test. Maintain the proper oil and refrig-

erant levels.

5. Protect the system from damage during shutdown

periods.

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

functions.

Prepare the Machine for Start-Up — Follow the

steps described in the Initial Start-Up section on page 56.

To Start the Machine

1. Start the water pumps, if not automatic.

2. On the LID default screen, press the LOCAL

CCN

softkey to start the system. If the machine is in

the OCCUPIED mode, and all machine timers have ex-

pired, the start sequence will start. Follow the procedure

described in the Start-Up/Shutdown/Recycle section on

page 37.

Check the Running System — After the compres-

sor starts, the operator should monitor the LID display and

observe the parameters for normal operating conditions:

1. The oil sump temperature should be 20-40 F (11-20 C)

above the condenser refrigerant temperature. At start-up,

the oil sump temperature will rapidly decrease. It will then

slowly rise to the compressor discharge temperature. Af-

ter start-up, the minimum oil sump temperature should

be 20 F (11 C) above the condenser refrigerant tempera-

ture. The oil sump temperature is dependent upon the com-

pressor discharge refrigerant temperature.

2. When the compressor is running, the oil sump should be

at least

⁄

full. The liquid level should be visible in the

separator sight glass.

3. The oil pressure displayed on the LID default screen is

equal to the difference between the oil pressure and evapo-

rator pressure transducer readings. Both readings are shown

on the Status01 table. Typically the reading will be 4 to

20 psi (28 to 138 kPa) [1.4 to 7 psi (9.7 to

48.3 kPa)] at initial start up until oil pressure ramp

up is complete. The full load reading is approximately

120 psi (821 kPa) [78 psi (538 kPa)].

4. The moisture indicator (dry-eye) sight glass on the re-

frigerant motor cooling line should indicate refrigerant

ﬂow and a dry condition.

5. The condenser pressure and temperature varies with the

machine design conditions. Typically the pressure will range

between 100 and 210 psig (690 to 1450 kPa)

[60 to 135 psig (329 to 780 kPa)] with a corresponding

temperature range of 60 to 105 F (15 to 41 C). The con-

denser entering water temperature should be controlled

below the speciﬁed design entering water temperature to

save on compressor kilowatt requirements but, not be be-

low 55 F (12.8 C).

6. Cooler pressure and temperature also will vary with the

design conditions. Typical pressure range will be be-

tween 60 and 80 psig (410 and 550 kPa) [30 to 40 psig

(204 to 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 building load is small. The active electrical demand

setting can be overridden to limit the compressor IKW

(input kilowatt), 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. It is accessed on the Equipment

Conﬁguration menu Conﬁg table (Table 3,

Example 5).

To Stop the Machine

1. The occupancy schedule will start and stop the machine

automatically once the time schedule is set up.

2. By pressing the Stop button for one second, the alarm

light will blink once to conﬁrm that the button has been

pressed. Then the compressor will follow the normal shut-

down sequence as described in the Controls section

page 13. The machine will not restart until the CCN

LOCAL

softkey is pressed. The machine is now in the

OFF mode.

If the machine fails to stop, in addition to action that the

PIC will initiate, the operator should open the slide valve

to reduce machine load by overriding the slide valve count

to −20. Then, the operator should open the main discon-

nect.

Do not attempt to stop the machine by opening an iso-

lating knife switch. High intensity arcing may occur. Do

not restart the machine until the problem is diagnosed

and corrected.

After Limited Shutdown — No special preparations

should be necessary. Follow the regular preliminary checks

and starting procedures.

Extended Shutdown — The refrigerant should be trans-

ferred into the storage vessel (if supplied; see Pumpout and

Refrigerant Transfer Procedures) in order to reduce machine

pressure and possibility of leaks. Maintain a holding charge

of 5 to 10 lbs (2.27 to 4.5 kg) of refrigerant to prevent air

from leaking into the machine.

If freezing temperatures are likely to occur in the machine

area, drain the chilled water, condenser water, and the pum-

pout condenser water circuits to avoid freeze-up. Keep the

waterbox drains open.

Leave the oil charge in the machine with the oil heater (if

applicable) and controls energized to maintain the minimum

oil sump temperature.

After Extended Shutdown — Be sure that the water

system drains are closed. It may be advisable to ﬂush the

water circuits to remove any soft rust which may have formed.

This is a good time to brush the tubes if necessary.

Check the cooler pressure on the LID default screen, and

compare to the original holding charge that was left in the

machine. If (after adjusting for ambient temperature changes)

any loss in pressure is indicated, check for refrigerant leaks.

See Check Machine Tightness section, page 39.

Recharge the machine by transferring refrigerant from the

storage tank (if supplied). Follow the Pumpout and Refrig-

erant Transfer Procedures section. Observe freeze-up

precautions.

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