Carrier Supra 650 Service Manual download pdf (Page 65)

4--12

62--10828

NOTE

It is possible that all liquid may not be pulled into

the receiver, as outlined in step d. In this case,

vapor charge remaining refrigerant through the

suction service valve.

e. When refrigerant cylinder weight (scale) indicates

that the correct charge has been added, close liquid

line valve on cylinder and backseat the king valve.

1. Suction Valve (Low Side)

2. Manifold Gauge Set

3. Discharge Valve (High Side)

4. Refrigerant Cylinder

5. Dead Head Port

Figure 4-10. Procedure for Adding A Complete

Charge

4.7.3 Adding A Partial Charge (See Figure 4-11)

CAUTION

Refrigerant R404a is a blend. Charging as a

vapor will change the properties of the

refrigerant. Only liquid charging through

the king valve is acceptable.

NOTE

The ambient (air entering the condenser) air

temperature should be above 40°F(4.4°C)

1. Suction Valve (Low Side)

2. Discharge Valve (High Side)

3. Manifold Gauge Set

4. Refrigerant Cylinder

5. Dead Head Port

Figure 4-11. Procedure for Adding A Partial

Charge

a. Place drum of refrigerant on scale and note weight.

Backseat discharge and suction service valves and

install a manifold gauge set in order to monitor sys-

tem. Purge lines. Connect the discharge gauge of a

second manifold test set to the king valve. Connect

the suction pressure hose to manifold dead head

port. Connect a charging line between the center tap

of the second gauge set and refrigerant drum. Mid-

seat discharge knob. Open the liquid valve on drum

and purge all hoses. Frontseat discharge knob. See

Figure 4-11.

b. Start the unit with the road compressor turning at

2400 rpm.

c. Check the sight glass to determine charge. See Sec-

tion 4.7.1. If undercharged, proceed with step d.

d. Front seat the king valve. Monitor the second set of

manifold gauges. When the king valve pressure

drops below the pressure in the refrigerant drum, mid-

seat the manifold gauge set discharge valve and al-

low liquid refrigerant to flow into the system.

e. While monitoring the sight glass, carefully weigh re-

frigerant into the system. It is not possible to accu-

rately determine when the system is full because unit

is in discharge state; therefore, never allow more than

1 lb. (0.45 kg) of refrigerant into system at a time.

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Comments to this Manuals

Hermes Hurtado 13 Mar 2025 | 11:43:58

Soy mecánico mantenedor. Necesito manuales técnicos

Carrier Supra 650 Service Manual Page 65

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