Maytag MSD2355HE Owner's Manual download pdf (Page 13)

Dehydrating Sealed Refrigeration System

Moisture in a refrigerator sealed system exposed to

heat generated by the compressor and motor reacts

chemically with refrigerant and oil in the system and

forms corrosive hydrochloric and hydrofluoric acids.

These acids contribute to breakdown of motor winding

insulation and corrosion of compressor working parts,

causing compressor failure.

In addition, sludge, a residue of the chemical reaction,

coats all surfaces of sealed system, and will eventually

restrict refrigerant flow through capillary tube.

To dehydrate sealed system, evacuate system (see

paragraph Evacuation).

Leak Testing

DANGER

To avoid risk of serious injury or death from violent

explosions, NEVER use oxygen or acetylene for

pressure testing or clean out of refrigeration

systems. Free oxygen will explode on contact with

oil. Acetylene will explode spontaneously when put

under pressure.

It is important to check sealed system for refrigerant

leaks. Undetected leaks can lead to repeated service

calls and eventually result in system contamination,

restrictions, and premature compressor failure.

Refrigerant leaks are best detected with halide or

electronic leak detectors.

Testing Systems Containing a Refrigerant Charge

1. Stop unit operation (turn refrigerator off).

2. Holding leak detector exploring tube as close to

system tubing as possible, check all piping, joints,

and fittings.

NOTE: Use soap suds on areas leak detector cannot

reach or reliably test.

Testing Systems Containing No Refrigerant Charge

1. Connect cylinder of nitrogen, through gauge

manifold, to process tube of compressor and liquid

line strainer.

2. Open valves on nitrogen cylinder and gauge manifold.

Allow pressure to build within sealed system.

3. Check for leaks using soap suds.

If a leak is detected in a joint, do not to attempt to repair

by applying additional brazing material. Joint must be

disassembled, cleaned and rebrazed. Capture refrigerant

charge (if system is charged), unbraze joint, clean all

parts, then rebraze.

If leak is detected in tubing, replace tubing. If leak is

detected in either coil, replace faulty coil.

Service Procedures

WARNING

To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test

procedures require power to be connected. Discharge capacitor through a 10,000 ohm resistor before attempting

to service. Ensure all ground wires are connected before certifying unit as repaired and/or operational.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 87 88

Comments to this Manuals

No comments

Maytag MSD2355HE Owner's Manual Page 13

Comments to this Manuals