Carrier 38AQ Specifications download pdf (Page 20)

Compressor Lockout (CLO) Device-- Tile Com-

pressor lockout (CLO) device prevents the compressor fiom

stariing or running in a high pressure, loss-of-chmge or

fieezestat open situation. Reset the CLO device by setting the

thermostat to eliminate cooling demand and return it to the ong_

inal set point, ff the system shuts down again for the stone fault,

determine the possible cause before attempting to _eset the CLO

device.

Preliminary Oil Charge (38AQS) -- Tile compressor

is factory chm'ged with oil (see N_bles IA-ID). When oil is

checked at stml-up, it may be necess;uy to add or remove oil

to bring it to the proper level. Add oil only if necessary to

bring oil into view in sight glass. Use only Carrier-al)l)nn'ed

¢Xm_l)ressor oil. One recommended oil level adjustment

method is as follows:

ADD OIL--Close vapor service valve and pump down

crankcase to 2 psig. Wait a few minutes and repeat until pres-

sure remains steady at 2 psig. Remove oil fill plug above the

sight glass, add oil through plug hole, and replace plug. Run

compressor for 20 minutes and check oil level.

NOTE: Use only Carrier approved compressor oil. Approved

sources are;

Petroleum Specialties, Inc ..................... Cryol 150A

Texaco, Inc ............................... Capella WF32

Witco Chemical Co .......................... Suniso 3GS

Do not use oil that has been &'ained out, or oil that has been

exposed to atmosphere.

REMOVE OIL -- Pump down compressor to 2 psig. Loosen

the l/4-in, pipe plug at the compressor base and allow the oil to

seep out past the threads of the plug. RetigNen plug when level

is correct.

NOTE: The crankcase is slightly pressurized. Do not remove

the plug, or the entire oil charge will be lost.

Small amounts of oil can be removed through the oil pump

discharge connection while the compressor is running.

Start Unit -- Tile field disconnect is closed, the fan circuit

bleaker is closed, and the space thermostat is set above ambient

so that there is no demand for cooling. Only the crankcase

heater will be energized.

Next, close the compressor circuit breaker and then reset

space thermostat below ambient so that a call for cooling is

ensured.

NOTE: Do not use circuit bleaker to start and stop the com-

plessor except in an emergency.

After starting, there is a delay of at least 3 seconds before

compressor starts.

Adjust Refrigerant Charge -- Refer toChargingCharts

Fig. 19A-19C and Table 8. Do not exceed maximum refriger-

ant charge. Vmy refrigerant until the conditions of the chart are

met. Note that chmging charts are different from type normally

used. Chmls are based on chmging the units to the correct

subcooling for the various operating conditions. Accurate pres-

sure gage and temperature sensing device me required.

Connect the pressure gage to the service port on the liquid

line service valve. Mount the temperature sensing device on

the liquid line, close to the liquid line service valve and insulate

it so that outdoor ambient temperature does not affect the read-

ing. Indoor airflow must be within the normal operating range

of the unit. Operate unit a minimum of 15 minutes. Ensure

pressure and temperature readings have stabilized. Plot liquid

pressure and temperature on chm't and add or reduce charge to

meet curve. Adjust charge to conform with charging chmt,

using the liquid pressure and temperature to read chart.

If the sight glass is cloudy, check refrigerant charge again.

EiIsure all fims arc ol)erating. Also ensme maximum allowable

liquid lift has not been exceeded. If charged per chmt and if the

sight glass is still cloudy, check for a plugged filter drier or a

pmtially closed solenoid v¢flve. Replace or repair, as needed.

55-

_'5¢-

_45"

> 49

E0,

O_DOOR FAN MUST BE OPE_TING

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_o IIIIIIIIIIIII111111 I_

iiiiIlilllll ,lllJl Jtllilii

iiiiiL!oL o!L LL !iiiiiii

,lO ............. IlllllYiil I_

liilllill iiiiiliii iili ii

,oo lllllllH'lllll! 1

_illlll,rllltlill I

1 illllHIIIIllll! I

iliili illi,I/lllltiillli I

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III11111 illllllllllllllllllll

°o!illl!lli lll!llil!llll!ltll!ll

50 1_ 1_ 2_ 250 _0 _0

LIQUID PRE_URE AT LIQUID VALVE (PSIG)

LIQUID PRE_URE AT _QUID VALVE (kPa)

Fig, 19A- 38AQ007 Charging Chart

344

400

ADD CHARGE IF ABOVE CURVE /

/ REDUCE CHARGE IF BELOW CURVE

100 150 200 250 300 350 400

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

6;9 1034 1;79 1724 2089 2414

LIQUID PRESSURE AT LIQUID VALVE (Kilopascals)

70-

65*

0_60.

>,55-

> 50-

45-

-_ 40-

'_ 35-

30-

25-

20"

Fig. 19B- 38ARQ008,012 Charging Chart

t00 150 200 250 300 350 400 450

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

7;0 _doo_so' _oo' roB' _oo_2ao' _soo'2z;o '3000

LIQUID PRESSURE AT LIQUID VALVE (kPa)

Fig. 19C -- 38AQS016 Charging Chart

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 31 32

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Carrier 38AQ Specifications Page 20

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