High Pressure Cutout Switch - TM-5-4120-222-140058

mode of operation, stop the unit and check the

electrical connection and coil. Refer to figure 5-16

and disconnect the electrical connector. Test the

solenoid valve coil for continuity with a multim-

eter set on OHMS. Continuity should exist be-

tween the coil leads. Connect one lead of the multi-

meter to the air conditioner casing and touch the

other lead to either of the coil leads. Continuity

should not exist.

c. Removal and Disassembly. Discharge the re-

frigerant system, refer to figure 5-15 and 5-16,

and remove and disassemble the hot gas bypass

solenoid valve.

Caution: The hot gas bypass solenoid valve

must be disassembled before disconnecting the

tubing from the valve to avoid heat distortion.

d. Reassembly and Installation. Replace any de-

fective parts, Reassemble and install in reverse

order of removal as illustrated on figures 5-16

and 516. Evacuate and recharge the unit refrig-

4 Pin

1 Snap ring

5 Linkage connector

2 Switch arms

erating system (para 533).

6 Linkage rod

3 Phenolic spacer

Caution: Solder the tubing to the valve before

Figure 5-9-Continued. (Sheet 2 of 2 ).

reassembling the valve to avoid heat distortion.

522. High Pressure Cutout Switch

524. Liquid Line Solenoid Valve and Liquid

Line Bypass Solenoid Valve

a. General. S o m e o f t h e e a r l i e r m o d e l

CE20VAL6 and CE20VAL4 air conditioners do

a. On-Equipment Testing. Start the air condi-

not have a high pressure cutout switch. The high

tioner. If the solenoid valves fail to click upon

pressure cutout switch prevents the compressor

start of operation, stop the unit and check the

from operating if the head pressure exceeds 445

electrical connection and coils. Test the solenoid

psig (pounds per square inch gage).

valve coils in the same manner as the hot gas

bypass solenoid valve coil (para 5-23).

b. Removal. Discharge the refrigerant system

and remove high pressure cutout switch as illus-

b. Removal and Disassembly. Refer to figures

rated in figure 5-15.

517 and 518, and remove and disassemble the

liquid line solenoid valve and liquid line bypass

c. Testing. Test the pressure switch for conti-

solenoid valve.

nuity with a multimeter set on OHMS. Press the

Caution: The solenoid valves must be disas-

reset button and recheck. Refer to the wiring dia-

sembled before disconnecting the tubing from the

gram for the points to establish continuity.

valve to avoid heat distortion.

d. Installation. Replace a defective high pres-

c. Reassembly and Installation. Pressure test,

sure cutout switch in reverse order of removal as

evacuate and recharge the refrigerant system

illustrated in figure 515. Evacuate and recharge

(para 5-33).

the unit refrigerant system (para 5-33).

Caution: Solder the tubing to the valves before

5-23. Hot Gas Bypass Solenoid Valve

reassembling the valves to avoid heat distortion.

a. General. Solenoid valves are automatically ac-

525. Dehydrator

tuated by the temperature control and control the

flow of refrigerant through the system.

a. General. The dehydrator prevents the accu-

mulation of moisture and contaminants within the

b. On-Equipment Testing. Start the air condi-

refrigerant tubing. The dehydrator must be re-

tioner. In the bypass mode of operation the tubing

placed each time the system is exposed to the at-

from the discharge side of valve should become

mosphere.

warm immediately. If not, stop the unit and check

the electrical connection and solenoid valve coil. If

b. Removal. Refer to figure 519, and remove

the valve fails to click upon start of the by-pass

the dehydrator.

AGO 20053A