Figure 4-8. Removal and installation of pressure switches

TM 5-4120-356-14

REMOVAL OF PRESSURE SWITCHES

REFER TO FIGURE 4-2 AND RELEASE

REFRIGERANT FROM THE SYSTEM.

2. REMOVE FOUR SCREWS (1) AND PULL PRESSURE

SWITCH ENCLOSURE (11) AWAY FROM PANEL.

3. REMOVE TWO SCREWS (2) AND WASHERS (3) FROM

LOW PRESSURE CUT-OUT SWITCH (4).

4. REMOVE TWO SCREWS (5) AND WASHERS (3) FROM

HIGH PRESSURE SWITCH (7).

5. REMOVE TWO SCREWS (8) AND WASHERS (9) FROM

PRESSURE CONTROL SWITCH (10).

6. PULL PRESSURE SWITCHES (4, 7, 10) OUT OF

PRESSURE SWITCH ENCLOSURE (11).

7. DISCONNECT TUBING CONNECTORS (12, 13, 14)

ANO REMOVE PRESSURE SWITCHES FROM UNIT.

8. TAG AND DISCONNECT ELECTRICAL LEADS FROM

PRESSURE SWITCHES.

INSTALLATION OF PRESSURE SWITCHES

1. CONNECT ELECTRICAL LEADS TO APPROPRIATE PRESSURE SW ITCH AND REMOVE TAGS.

2. CONNECT TUBING CONNECTORS (12, 13, 14) TO APPROPRIATE PRESSURE SWITCH.

3. POSITION PRESSURE SWITCHES IN ENCLOSURE AND POSITION GROMMETS (15, 16, 17) IN

SLOTS PROVIDED IN ENCLOSURE (11).

4. SECURE PRESSURE CONTROL SWITCH (10) WITH TWO SCREWS (8) AND WASHERS (9).

5. SECURE HIGH PRESSURE CUT-OUT SWITCH (7) WITH TWO SCREWS (5) AND WASHERS (6).

6. SECURE LOW PRESSURE CUT-OUT SWITCH (4) WITH TWO SCREWS (2) AND WASHERs (3).

7. POSITION PRESSURE SWITCH ENCLOSURE (11) ON PANEL AND SECURE WITH SCREWS (1).

8. REFER TO PARAGRAPH 4-13 FOR FINAL STEPS IN INSTALLATION OF PRESSURE SWITCHES.

Figure 4-8. Removal and installation of pressure switches

4-2.4