CHARGING THE SYSTEM (cont)

TM5-4110-234-14

TO 40R7-5-7-1

(5)

Open manifold valves and service valves and allow refrigerant vapor to flow into the system.

(6) Allow refrigerant vapor to flow into the system until both manifold gages show a positive pressure of at

least 50 psi (3.5 kg/cm2).

(7)

Determine which hose is connected to the discharge service valve, and close the manifold valve to that

hose.

(8)

Be sure that hoses are out of the way of all moving parts on the refrigerator.

(9) Set refrigeration system valves in accordance with paragraph 4-9a through g. (10)

Connect power

and turn unit on. Reset pressure switch.

(11) Continue to charge the unit and monitor the weight of the refrigerant drum as the compressor pulls

additional refrigerant vapor into the system until the drum weight has decreased by 20 pounds (9.07 kg.).

(12) When the system is fully charged, immediately close the refrigerant drum valve.

(13) Run the air conditioner in COOL mode (with temperature control in coolest position) for 15 minutes.

Do not skip the next step.

(14) After 15 minutes, observe the sight glass through the left access door.

Blue center means the refrigerant moisture content is acceptable.

Pink center means there is too much moisture in the system. It must be discharged,

evacuated and charged again.

Milky white or bubbly liquid means the system has a low charge.

Clear bubble-free liquid around the center means the system is fully charged.

(15) If charge is low add refrigerant vapor.

(a)

Open the drum valve.

(b)

Continue to charge until sight glass is clear and bubble-free.

(c)

Close the refrigerant drum valve.

(16) Turn the unit off.

(17) Backseat the compressor service valves.

(18) Disconnect hoses from the valve tees.

(19) Place flare nuts on the suction and discharge valve tees.

(20) Crack the backseated compressor valves.

(21) Close access doors.

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