Carrier 23XL Dokumentacja Pobierz pdf (Strona 64)

Refrigerant Leak Rate — ASHRAE recommends that

machines should be immediately taken off line and repaired

if the refrigerant leakage rate for the entire machine is more

than 10% of the operating refrigerant charge per year.

Additionally, Carrier recommends that leaks totalling less

than the above rate but more than a rate of 1 lb (0.5 kg) per

year should be repaired during annual maintenance or when-

ever the refrigerant is pumped over for other service work.

Test After Service, Repair, or Major Leak — If

all refrigerant has been lost or if the machine has been opened

for service, the machine or the affected vessels must be pres-

sured and leak tested. Refer to the Leak Test Machine sec-

tion to perform a leak test.

HCFC-22 and HFC-134a will dissolve oil and some non-

metallic materials, dry the skin, and, in heavy concen-

trations, may displace enough oxygen to cause asphyxi-

ation. In handling this refrigerant, protect the hands and

eyes and avoid breathing fumes.

REFRIGERANT TRACER — Use an environmentally ac-

ceptable refrigerant as a tracer for leak test procedures.

TO PRESSURIZE WITH DRY NITROGEN — Another

method of leak testing is to pressure with nitrogen only and

use soap bubble solution or an ultrasonic leak detector to

determine if leaks are present. This should only be done if

all refrigerant has been evacuated from the vessel.

1. Connect a copper tube from the pressure regulator on the

cylinder to the refrigerant charging valve. Never apply

full cylinder pressure to the pressurizing line. Follow the

listed sequence.

2. Open the charging valve fully.

3. Slowly open the cylinder regulating valve.

4. Observe the pressure gage on the machine and close the

regulating valve when the pressure reaches test level. Do

not exceed 140 psig (965 kPa).

5. Close the charging valve on the machine. Remove the

copper tube if no longer required.

Repair the Refrigerant Leak, Retest, and Apply

Standing Vacuum Test —

After pressurizing the ma-

chine, test for leaks with a soap bubble solution, an elec-

tronic leak detector, a halide torch, or an ultrasonic leak de-

tector. Bring the machine back to atmospheric pressure, repair

any leaks found, and retest.

After retesting and ﬁnding no leaks, apply a standing vacuum

test. Then dehydrate the machine. Refer to the Standing Vacuum

Test and Machine Dehydration in the Before Initial Start-Up

section, page 48.

Trim Refrigerant Charge — If it becomes necessary

to adjust the refrigerant charge to obtain optimum machine

performance, operate the machine at design load and then

add or remove refrigerant slowly until the difference be-

tween leaving chilled water temperature and the cooler re-

frigerant temperature reaches design conditions. Do not

overcharge. For superheat information, see the Troubleshoot-

ing section on page 68.

Refrigerant may be added either through the optional stor-

age tank or directly into the machine as described in the sec-

tion entitled, Refrigerant Charging.

To remove any excess refrigerant, follow the procedure in

Transfer Refrigerant from Machine to Storage Tank section,

Steps 1a, b on page 62.

WEEKLY MAINTENANCE

Check the Lubrication System —

Mark the oil level

on the sight glasses and observe the level each week while

the machine is shut down.

If the level goes below the sight glass, the oil reclaim sys-

tem will need to be checked for proper operation. If addi-

tional oil is required, add it through the oil charging valve

(Fig. 2A and 2B). A hand pump is required for adding oil

against refrigerant pressure. The oil charge is approximately

4.2 gal (15.9 L) for Frame 1 and 2 machines and 10 gal

(38 L) for Frame 4 machines. The oil must meet Carrier’s

speciﬁcations for the 23XL. Refer to Changing Oil and Oil

Filter section. Any oil that is added should be logged by not-

ing the amount and date in Fig. 40 on page 60. Any oil that

is added due to oil loss not related to service will eventually

return to the sump. It must be removed when the level is

above the sight glass.

NOTE: Frame 4 machines do not use an oil heater.

On Frame 1 and 2 machines, a 500-watt oil heater is con-

trolled by the PIC to maintain oil temperature above 140 F

(60 C) [120 F (48.9 C)] or refrigerant temperature plus

60 F (15.6 C) [40 F (4.4 C)] when the compressor is off (see

the Controls section on page 13). The LID Status02 table

displays whether the heater is energized or not. If the PIC

shows that the heater is energized, but the sump is not heat-

ing up. If the sump is not heating up, the power to the oil

heater may be off or the oil level may be too low. Check the

oil level, the oil heater contactor voltage, and oil heater

resistance.

The PIC will not permit compressor start-up if the oil tem-

perature is too low (Fame 1 and 2 machines). The control

will continue with start-up only after the temperature is within

limits.

SCHEDULED MAINTENANCE

Establish a regular maintenance schedule based on the ac-

tual machine requirements such as machine load, run hours,

and water quality. The time intervals listed in this section are

offered as guides to service only.

Service Ontime — The LID will display a SERVICE

ONTIME value on the Status01 table. This value should be

reset to zero by the service person or the operator each time

major service work is completed so that time between serv-

ice can be seen.

Inspect the Control Center — Maintenance is gen-

erally limited to general cleaning and tightening of connec-

tions. Vacuum the cabinet to eliminate dust build-up.

In the event of machine control malfunctions, refer to the

Troubleshooting Guide section for control checks and

adjustments.

Be sure power to the control center is off when

cleaning and tightening connections inside the control

center.

Check Safety and Operating Controls Monthly

—

To ensure machine protection, the Automated Control

Test in the service menu should be done at least once per

month. See Table 4 for safety control settings.

Changing Oil and Oil Filter — If the pressure drop

across the ﬁlter has approached the OIL FILTER PRESS

ALERT value on the Equipment Service, Service1 table, change

oil ﬁlter as needed. Otherwise, change the oil ﬁlter on a yearly

basis.

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Carrier 23XL Dokumentacja Strona 64

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