Scotsman Ice Ice Machine User's Manual
Contents
1. have just begun to be pierced Stopping here Causes severe operational issues as well as refrigerant leaks e Page 5 shows an even more complete assembly with only one thread showing However this assembly is still not complete If not tightened further there will be refrigeration restrictions and leaks e Page 6 shows the two parts almost together the threads are flush At this point the main problem will be refrigerant leaks Page 7 shows the couplings properly assembled with the critical last 1 4 turn Page 8 shows details of the brass to brass sealing action not visible when the couplings are assembled Note that couplings that are screwed together but have threads showing are not only leaking refrigerant they are restricting the flow of refrigerant through the small slits in the membranes or diaphragms Page 3 Coupling Assembly Details Two Threads Showing Barely Pierced Knives Just Showing Page 4 Coupling Assembly Details One Thread Showing Partly Pierced Knives Exposed Page 5 Coupling Assembly Details oe J Ea E p g 3 a a e l Threads Flush P Pierced but will leak Page 6 Coupling Assembly Details Correctly Tightened Fully Open Fully Open Page 7 Coupling Sealing Details Coupling sealing occurs when the two sections seat together At the final 1 4 turn the shoulders in the swivel nut end are compressed ag2. Scotsman Refrigeration Line Set Installation Details of Quick Connect Coupling Assembly Quick connect coupling assembly can be as simple as tightening a nut But if not done properly an expensive not covered by warranty refrigerant leak will occur This booklet lists correct assembly steps shows results of partial assembly and describes how a leak proof joint is made Male Fitting Before Connecting Male Fitting After Connecting Coupling Assembly Details Coupling Connection Instructions 1 Remove the protector caps and plugs Wipe the seats and threaded surfaces with a clean cloth to remove any possible foreign matter 2 Thoroughly lubricate the threads o rings diaphragms and all internal coupling surfaces with polyolester refrigerant oil Failure to lubricate could cause a false sense of tightness and a leak will result from the incomplete assembly Note Scotsman line sets include lubricant packets 3 Position the fittings on the correct connections on the condenser and ice machine 4a Begin to tighten the couplings together by hand Continue to turn the swivel nuts by hand until it is certain that the threads are properly engaged 4b Using two wrenches one to rotate the swivel nut and one to hold the tubing in place tighten each coupling It is CRITICAL that ONLY the NUT on the pre charged tube be turned or the diaphragms will be torn by the piercing knives and become loose in the refrigeration syst
3. ainst the male end sealing area forming two grooves in it and sealing the coupling Male End Before Use Swivel Nut End Swivel Nut Removed Scotsman Ice Systems 800 533 6006 item 291 824 Page 8
4. em Causing severe operational problems Note As the coupling is tightened the diaphragms in the quick connect couplings will begin to be pierced As that happens there will be increased resistance to tightening the swivel nut 4c Continue tightening the swivel nut until it bottoms out or a very definite increase in resistance is felt no threads should be showing Do NOT overtighten 5 Use a marker or pen to mark a line on the coupling nut and unit panel Then tighten the coupling nut an additional one quarter turn The line will show the amount that the nut turns Note The final 1 4 turn forces two shoulders on the swivel nut end into the beveled surface of the male end resulting in a sealed brass to brass connection 6 After all connections have been made check the couplings for leaks Page 2 Coupling Assembly Details Coupling Description The following pages show the stages of coupling assembly as the swivel nut and male fitting are drawn together The swivel nut end contains one diaphragm in the center post The male fitting contains the knife blades and its own diaphragm Note 3 8 male ends have one knife blade No sealing takes place until the final stage when the outer edge of the center post in the swivel nut is forced against the bottom of the male fitting creating a mechanical seal e Page 4 shows what appears to be a completed assembly with only two threads showing but the diaphragms
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