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Old 04-15-2012
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Isotherm SP system venting

Am about to install an Isotherm SP refrig unit. I removed/drilled out the old fiberglass standpipe, added 8 layers of glass around the new LARGE hole, all of which worked out fine. The existing sink drain has a one-way ball just below the tailpiece. I'm wondering if I should just remove this or leave it and tee off a separate 1-1/2" vent. The installation specs seem to indicate that having the 1-1/2" pipe open to the sink is necessary to get proper circulation around the heat exchanger coils. Am wondering if anyone else has encountered this installation issue?
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