Carrier 50PG03-07 Dokumentacja Pobierz pdf (Strona 40)

MOTOR

MOUNTING

BASE

SCREW

(HIDDEN)

FAN DECK

STOP

Refrigerant Charge -- Amount of refrigerant charge is

listed on unit nameplate. Refer to Carder GTAC II; Module 5;

Charging, Recovery. Recycling, and Reclmnation section for

chmging methods and procedures. Unit panels must be in place

when unit is operating dunng charging procedure.

Puron® (R-410A) refrigerant cylindel_ contain a dip tube

which _dlows liquid refrigerant to flow from the cylinder in an

upright position. Charge units with cylinder in the upright posi-

tion and a commerci_d type metering device in the manifold hose.

FAN

•MOTOR PULLEY

PULLEY

SCREW

SLIDE-OUT

PAN DECK

Fig. 22 -- Evaporator-Fan Motor Adjustment

STRAIGHTEDGE MUST

PARALLEL

WITH BELT

PULLEY

MOTOR AND FAN

SHAFTS MUST BE

PARALLEL

MOVABLE

FLANGES

SETSCREWS_

FIXED FLANGES

SINGLE-GROOVE

This system uses Puron refrigerant which has higher

pressures than R-22 and other refrigerants. No other refrig-

erant may be used in this system. Gage set, hoses, and

recovery system must be designed to handle Puron refrig-

erant. If unsure about equipment, consult the equipment

manu factureE

NOTE: Do not use recycled refrigerant as it may contain

contaminants.

NO CHARGE -- Use standard evacuating techniques. After

evacuating system, weigh in the specified amount of refriger-

ant Qefer to unit nameplate).

LOW CHARGE COOLING -- Using cooling charging chart

(see Fig. 26-30), add or lemove refrigerant until conditions of

the chart are met. An accurate pressure gage and temperature-

sensing device is lequiled. Charging is accomplished by

ensuring the proper amount of liquid subcooling. Connect

pressure gage to the compressor discharge service v_dve.

Connect temperature sensing device to the liquid line between

the condenser and the TXV (thermostatic expansion valve) and

insulate it so that ambient temperature does not affect reading.

TO USE THE COOLING CHARGING CHART -- Use the

above temperature and pressure readings, and find the intersec-

tion point on the cooling charging chart. If intersection point on

chmt is above line, add refrigerant. If intersection point on

chmt is below line, carefully recover some of the charge. Re-

check suction pressure as charge is adjusted.

NOTE: Indoor-air cfm must be within normal operating range

of unit. All outdoor fans must be operating.

The TXV is set to maintain between 10 and 15 degrees of

superheat at the compressors. The valves are factory set and

cannot be adjusted. Do not use a TXV designed for use with

R-22 refrigemnt.

Fig. 23 -- Evaporator-Fan Alignment and

Adjustment

Fig. 24 -- Condenser-Fan Adjustment

5OOO

4500

4000

3500

3000

2500

2000

1500

1000

500

LEAK IN

VACUUM TIGHT

TOO WET

TIGHT

DRY SYSTEM

0 1 2 3 4 5 6 7

MINUTES

Fig. 25 -- Deep Vacuum Graph

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 48 49

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