Manitowoc Ice QC0700, QF2300, QF0800, QF0400, QF2200 Refrigeration System, Section, 7-20

Refrigeration System Section 7

Mild System Contamination Cleanup Procedure

1.Replace any failed components.

2.If the compressor is good, change the oil.

3.Replace the liquid line drier.

NOTE: If the contamination is from moisture, use heat lamps during evacuation. Position them at the compressor, condenser and evaporator prior to evacuation. Do not position heat lamps too close to plastic components, or they may melt or warp.

Severe System Contamination Cleanup Procedure

1.Remove the refrigerant charge.

2.Remove the compressor.

3.If burnout deposits are found inside the suction or discharge lines at the compressor.

4.Wipe away any burnout deposits from suction and discharge lines at compressor.

5.Sweep through the open system with dry nitrogen.

Important

Dry nitrogen is recommended for this procedure. This will prevent CFC release.

4.Follow the normal evacuation procedure, except replace the evacuation step with the following:

A.Pull vacuum to 1000 microns. Break the vacuum with dry nitrogen and sweep the system. Pressurize to a minimum of 5 psi.

B.Pull vacuum to 500 microns. Break the vacuum with dry nitrogen and sweep the system. Pressurize to a minimum of 5 psi.

C.Change the vacuum pump oil.

D.Pull vacuum to 500 microns. Run the vacuum pump for 1/2 hour on self-contained models, 1 hour on remotes.

NOTE: You may perform a pressure test as a preliminary leak check. You should use an electronic leak detector after system charging to be sure there is no leak.

5.Charge the system with the proper refrigerant to the nameplate charge.

6.Operate the ice machine.

Important

Refrigerant sweeps are not recommended, as they release CFC’s into the atmosphere.

6.Install a new compressor and new start components.

7.Install a suction line filter-drier in front of compressor. (Remote Models replace suction filter with an acid removal suction filter/drier). Install access valves to allow pressure drop readings to be taken across the suction filter, when needed.

8.Install a new liquid line drier.

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7-20 Revised 8/2003 Part No. 80-1214-3