Air Conditioner Receiver-Drier Replacement

TM 9-2320-363-34-1 · Chapter 11.1 — Air Conditioning System Maintenance

This task covers: a. Removal b. Installation

Applicable Configuration:                                   General Safety Instructions:

All except M915A2 and M916A1
                                                                              WARNING
Tools and Special Equipment:
                                                              •   Use care to prevent refrigerant from
Tool Kit, SC 5180-90-CL-N26                                       touching your skin or eyes, because
Shop Equipment, SC 4910-95-CL-A31                                 liquid refrigerant, when exposed to air,
                                                                  quickly evaporates and will freeze skin or
Materials/Parts:                                                  eye tissue. Serious injury or blindness
                                                                  could result if you come in contact with
Packing, Preformed (2)       P/N 011C944-70
Cap and Plug Set             Appendix B, Item 7.1                 liquid refrigerant.
Loctite                      Appendix B, Item 33
Oil, Refrigerant             Appendix B, Item 43.1            •   Refrigerant R-134a air conditioning
Tags, Identification         Appendix B, Item 55                  systems should not be pressure tested or
                                                                  leak tested with compressed air.
References:                                                       Combustible mixtures of air and R-134a
                                                                  may form, resulting in a fire or explosion,
TM 9-2320-363-10                                                  which could cause personal injury.
TM 9-2320-363-20

Equipment Condition:
Reference               Condition Description
TM 9-2320-363-20        Batteries Disconnected
TM 9-2320-363-20        Binary Switch Removed
Page 11.1-2             Refrigerant Recovered
Page 11.1-21            Fan Cycling Switch
                        Removed

                                                 CAUTION
              Water and dirt can damage the refrigerant system. Five minutes of not being
              capped is the limit for any hose or component. Do not blow shop air through the
              refrigerant hoses; shop air is wet (humid).

                                                     NOTE
          The receiver-drier and moisture indicator are one unit and cannot be replaced separately.

TM page Change 1 11.1-15

Illustration from TM 9-2320-363-34-1 (PDF page 807)

NOTE If the desiccant cartridge inside the receiver-drier has fallen apart, evacuate the system and replace the expansion valve and the refrigerant compressor (desiccant matter can’t be removed from these parts). A cartridge may fall apart from too much moisture in the system, because of poor evacuation of the system, or lack of maintenance.

Do not disconnect or connect refrigerant fittings using only one wrench. Hold one fitting in place using a wrench, and turn the other fitting with a second wrench.

1. TAG AND DISCONNECT REFRIGERANT LINES (1) FROM THE RECEIVER-DRIER (2). INSTALL PLUGS IN THE REFRIGERANT LINES. DISCARD PREFORMED PACKINGS.

2. LOOSEN HOSE CLAMP (3) ATTACHING THE RECEIVER-DRIER (2) TO THE MOUNTING BRACKET AND REMOVE THE RECEIVER-DRIER.

1. POSITION THE RECEIVER-DRIER (2) IN THE MOUNTING BRACKET. TIGHTEN THE HOSE CLAMP (3) SECURELY.

2. REMOVE THE PLUGS FROM THE REFRIGERANT LINES (1) AND THE LINE PORTS ON THE NEW RECEIVER-DRIER (2). INSTALL NEW PREFORMED PACKINGS AND APPLY REFRIGERANT OIL TO THEM. APPLY LOCTITE 242Ò TO THE MALE FITTING THREADS AND CONNECT THE REFRIGERANT LINES TO THE RECEIVER-DRIER. USING TWO WRENCHES TO AVOID TWISTING THE TUBING, TIGHTEN THE CONNECTIONS TO THE VALUES IN TABLE D-3, APPENDIX D.

3. SERVICE AIR CONDITIONER COMPRESSOR (page 11 .1-23).

NOTE Follow-on Maintenance:

Install fan cycling switch (page 11 .1-21). Install binary switch (TM 9-2320-363-20). Connect batteries (TM 9-2320-363-20). Charge and leak test air conditioning system (page 11.1-2 and TM 9-2320-363-20). Check operation of air conditioning system (TM 9-2320-363-10).

TM page 11.1-16 Change 1