Figure 6-3. Pressure temperature chart.

Figure 6-3. Pressure temperature chart.

6-2. Refrigerant Tubing

(6) Install condenser fan and grill (para

3-lo).

The refrigerant tubing used in the air condi-

(7) Open refrigerant drum shutoff valve.

tioner consists of copper tubing and the necessary

Start unit and weigh in 3.5 pounds of refrigerant

fittings. The joints of the refrigerant tubes are

R-22, Continue adding refrigerant until sight

soldered with silver solder (para 5-10f(3)). In-

glass indicates full.

spect the tubing and fittings for leaks, cracks,

breaks, or signs of excessive wear. Replace any

Note. Operate unit at COOL position during

defective tubing or fittings with material of the

charging operation. Partially block discharge grill with

same size, type, and shape. When applying heat

cardboard baffle. Adjust baffle until suction pressure gage

reads 55 psig pressure. Continue adjusting bathe until the

to the tubing close to a solenoid valve, direct the

discharge pressure corresponding to the ambient tempera-

heat away from the valve body. Keep flame away

ture is obtained.

from distributor of expansion valves. Test all

tubing repairs for leaks.

(8) Close service valves, close refrigerant

drum shutoff valve and stop the unit.

Note. If the refrigerant system has been exposed to

(9) Disconnect the pressure manifold from

the atmosphere by the removal of any tubing or a fitting,

replace the dehydrator and pressure test and evacuate the

the service valves. Replace valve caps.

system before recharging. When removing or replacing

(10) Inspect the compartment thoroughly

tubing, pass dry nitrogen through the lines to prevent cop-

and install the condenser fan and grill (para

per oxides.

3-19).

Section II. CONTROL PANEL AND BLOWER MOTOR

b. Disassembly and Reassembly. Refer to figure

6-3. Control Panel

6-4 and disassemble the control panel.

a. Removal. Refer to paragraph 3-24 and re-

c. lnstallation. Refer to paragraph 3-24 and in-

move the control panel.

stall the control panel.

Figure 6-4--Continued.

6-4