Carrier 23XL Specifications download pdf (Page 61)

PUMPOUT AND REFRIGERANT

TRANSFER PROCEDURES

Preparation —

The 23XL may come equipped with iso-

lation valves and/or a pumpout system/optional storage tank

for the purpose of servicing the unit. The pumpout system

may come equipped with or without a storage tank. Three

possibilities are available:

1. If isolation valves are supplied, the refrigerant can be pumped

to either the cooler vessel or the condenser vessel by us-

ing the optional pumpout system without a storage tank.

2. Whether or not isolation valves are supplied, the refrig-

erant can be pumped to and isolated in an optional stor-

age tank by using the optional pumpout system.

3. If isolation valves are not supplied, a pumpout system

with a storage tank is needed.

The following procedures are used to describe how to trans-

fer refrigerant from vessel to vessel and perform machine

evacuation.

Operating the Optional Pumpout Compressor

1. Be sure that the suction and the discharge service valves

on the optional pumpout compressor are open (back-

seated) during operation. Rotate the valve stem fully coun-

terclockwise to open. Frontseating the valve closes the

refrigerant line and opens the gage port to compressor

pressure.

2. Make sure that the compressor holddown bolts have been

loosened to allow free spring travel.

3. Open the refrigerant inlet valve on the pumpout

compressor.

4. Oil should be visible in the compressor sight glass under

all operating conditions and during shutdown. If oil is low,

add oil as described under Optional Pumpout

System Maintenance section, page 67. The pumpout unit

control wiring schematic is detailed in Fig. 41.

TO READ REFRIGERANT PRESSURES during pumpout

or leak testing:

1. The LID display on the machine control center is suitable

for determining refrigerant-side pressures and low (soft)

vacuum. For evacuation or dehydration measurement, use

a quality vacuum indicator or manometer to ensure the

desired range and accuracy. This can be placed on the

Schrader connections on each vessel by removing the pres-

sure transducer.

2. To determine storage tank pressure, a 30 in.-0-400 psi (-101-

0-2760 kPa) gage is attached to the vessel.

3. Refer to Fig. 31-34, and 42 for valve locations and

numbers.

Transfer, addition, or removal of refrigerant in spring-

isolated machines may place severe stress on external

piping if springs have not been blocked in both up and

down directions.

Machines with Storage Tanks — If the machine has

isolation valves, leave them open for the following proce-

dures. The letter ‘‘C’’ describes a closed valve. Valves 9 and

10 on the storage tank are always closed.

TRANSFER REFRIGERANT FROM STORAGE TANK TO

MACHINE

NOTE: Valve 14 is only available on Frame 1 and 2 ma-

chines. Valves 16 and 17 are only available on Frame 4 ma-

chines.

1. Equalize refrigerant pressure.

a. Use the Control Test Terminate Lockout to turn on wa-

ter pumps and monitor pressures.

b. Close pumpout/storage tank valves 2, 4, 5, and 8, and

close the appropriate machine charging valve 7A and

7B; open appropriate machine isolation valves 11 through

17.

c. Open pumpout/storage tank valves 3 and 6, open ma-

chine valves 1a and 1b.

VALVE 1a1b234567a7b811121314151617

CONDITION CCC CCC

C—Contactor

Fu — Fuse, 3 Amps

HP — High-Pressure Cutout

OL — Compressor Overload

T’stat — Internal Thermostat

Compressor Terminal

Contactor Terminal

Overload Terminal

Pumpout Unit Terminal

*Bimetal thermal protector imbedded in motor winding.

Fig. 41 — 23XL Pumpout Unit Wiring Schematic

Fig. 42 — Optional Pumpout System

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 103 104

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Carrier 23XL Specifications Page 61

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