Carrier 38ED Manual do Utilizador descarregar pdf (Página 8)

actual suction line temperature (step 6) is higher

than table value, the system is undercharged. If

suction line temperature is lower than table

value, system is overcharged.

EXAMPLE: At outdoor air temperature of 85 F

and evaporator temperature of 44 F, the system

will be correctly charged at 60 F ± 2 F suction

line temperature. See Table 7.

Table 7 — 38ED Chargemaster Charging Chart

(AccuRater™ System)

SATURATED EVAPORATOR TEMPERATURE (F)

TEMP

(F)

34 36

38 40

■

46 48 50 52 54

Suction Line Temperature (F)

60 60

49 58 65

48 58 68

7é;:

35 41 48

6g;

36; 42 50 59; 80

61 69 78

48 53 59 67

100 43 47

68 88

105

44 53

60 75 104

110

49 54

115 50 62

I Example

8 Add charge by slowly opening Chargemaster

valve. If necessary, reduce charge by bleeding at

liquid line service valve. Check outdoor air and

evaporator temperature during procedure. If

they change, refer back to Chargemaster Charg

ing Chart.

Correct use of Chargemaster ensures that an opti

mum refrigerant charge will be in system when con

ditions and system components are normal. How

ever, the Chargemaster does not solve or fix system

abnormalities. It indicates correct charge for condi

tion of the system. It will not make corrections for

dirty filters, slow fans, excessively long or short suc

tion lines or other abnormal conditions. This charg

ing device ensures that a correct relationship exists

between outdoor temperature, evaporator tempera

ture, and suction line temperature on a specific

system.

SIGHT GLASS METHOD — (Field-supplied sight

glass installed in liquid line.) A satisfactory oper

ating charge can be obtained on thermal expansion

valve systems only by charging to a clear sight glass.

For optimum charge, increase high-side pressure to

380 ± 10 psig by blocking condenser fan discharge

or air entering condenser. Charge to a clear sight

glass while holding constant high-side pressure. For

peak efficiency, adjust charge to yield a liquid refrig

erant temperature at the evaporator that is approxi

mately the same as outdoor dry-bulb temperature.

SERVICE

Compressor Removal — See Table 8 for com

pressor information and Fig. 8 for component loca

tion. Shut off power to unit. Remove refrigerant

from unit using refrigerant removal methods de

scribed in Carrier Standard Service Techniques

Manual, Chapter 1, Refrigerants. Be sure system

pressure is 0 psig before attempting compressor

removal.

ACCUMULATOR CONDENSER COIL

DISCHARGE GRILLE

(FAN MOTOR UNDERNEATH)

COMPRESSOR

(SOUND SHIELD

REMOVED)

(TOP COVER AND LOUVERED CASING REMOVED)

Fig. 8 — Component Locations

1 2 3 4 5 6 7 8 9 10 11 12

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