Carrier 30H User Manual download pdf (Page 6)

Check Refrigerant Charge

1MP(.)R'1 \N T; Do not t>pi;n liquid \al\t' or

«-•omprcssor ciisdniiiie \al\o uinil it is deter

mined that there is a charge in the remainder of

the system. .1 ¡h‘.sin\i- /ircs'.urc u;// induuh' a

iharj^f m ¡hi' siv/iv//

The units are shipped with a full refrigerant

charge (see Table 2). However, if it is necessary to

add refrigerant, the unit should be operated for

some time at full capacity and then charge can be

added until the sight glass is clear of bubbles. For

maximum liquid subcooling, the liquid level should

be up to the liquid level test cock located on the

shell, near the end, of each tower condenser. This

usually requires additional refrigerant charge

beyond the amount to clear the sight glass (see

LIQUID CHARGING METHOD).

If there is no refrigerant vapor pressure in the

system, the entire system must be leak tested. After

repair of leaks, the system must be evacuated before

recharging. See Standard Service Techniques

Manual, Chapter 1, Refrigerants, for leak testing,

evacuation and charging procedures.

C.M.' nON; When adjusting rdrigerant charge.

Circulate water thru the condenser and cooler at

ail times to prevent frec/ing. Frec/ing damage is

considered abuse and is not covered by Carrier

warrants.

The liquid charging method is recommended for

complete charging or when additional charge is

required.

LIQUID CHARGING METHOD

C.\U i'lON; Be careful not to overcharge s\s-

tem. Oserchaigmg results in higher discharge

pressure with higher cooling water consurnp-

tion, possible compressor damage, higher power

consumption.

Charge thru I / 4-in. flare connection on liquid line

shutoff valve. Never charge liquid into the low-

pressure side of the system.

1. Frontseat (close) liquid line shutoff valve.

2. Connect a refrigerant cylinder loosely to charg

ing valve connection. Purge charging line and

tighten connections.

3. Open liquid line shutoff valve.

4. If system has been dehydrated and is under

vacuum, break vacuum with refrigerant (gas

charge). Build up system pressure to 58 psi for

R-22 (32 F). Invert refrigerant cylinder so that

liquid refrigerant will be charged.

5. a. For complete charge, see “Charging” in

Standard Service Techniques Manual, Chap

ter 1, Refrigerants. Follow Charging By

Weight procedure. (When charge is nearly

full, complete process by observing sight glass

for clear liquid flow.)

b. For complete charge where refrigerant

cylinder cannot be weighed, or for adding

refrigerant, follow the procedure Charging

By Sight Glass in the manual.

6. To ensure maximum subcooler performance,

check liquid level in tower condensers by means

of test cock located on each condenser shell near

right end tube sheet. Liquid discharge from test

cock indicates fully charged subcooler.

Check Oil Charge — All units are factory charged

with oil. If oil is visible in sight glass, check the unit

for operating readiness as described in the section,

Initial Check; then start compressor. Observe level

and add oil, if required, to bring level in erankcase

! / 8 to 3/ 8^ of bull’s-eye during steady operation. To

add or remove oil, see Standard Service Techniques

Manual, Chapter 1, Refrigerants.

Use only Carrier approved compressor oil. Do

not reuse drained oil or use any oil that has been

exposed to atmosphere.

Approved compressor oils:

Sun Oil Co. Suniso 3GS

Texaco, Inc. Capella BI

E.I. DuPont Co. DuPont Synthetic Refrig

eration Oil, 150 SSU only

TO ADD OIL

Close suction shutoff valve and pump down

crankcase to 2 psig (low-pressure cutout must be

bypassed with a jumper). Wait a few minutes and

repeat as needed until pressure remains at 2 psig.

Close diseharge shutoff valve. Remove oil fill plug

above bull’s-eye, add oil thru plug hole and replace

plug. Reopen suction and discharge valves. Run

compressor for about 20 minutes and check the oil

level.

TO REMOVE OIL

Pump down eompressor to 2 psig. Close suetion

and discharge valves. Loosen the 1/4-in. pipe plug

in compressor base and allow the oil to seep out

past the threads of the plug. The crankcase will be

under slight pressure. Be careful not to remove the

plug; the entire oil charge may be lost. Small

amounts of oil can be removed thru oil pump dis

charge connection while compressor is running.

START-UP AND OPERATION CHECKS

Start-up should be performed only under super

vision of experienced refrigeration mechanic. Be

sure crankcase heaters have been energized for 24

hours.

1. Open all system valves that may have been

closed during or after charging.

2. Check air-handling equipment, chilled water

and condenser water pumps, and any other

equipment eonneeted to chiller.

3. Start unit by firmly pushing ON button.

4. Check all controls for proper operation.

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Carrier 30H User Manual Page 6

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