Nordyne SC Installation Instructions Manual page 19

Figure 15. Pressure Switch Tubing
for *SD038 Furnaces Only
Figure 16. Pressure Switch Tubing for Upflow Furnaces
(Models *SC054, *SC072, *SC090, *SC108, & *SC120)
(Models *SD054, *SD072, *SD090, *SD108, & *SD120)
Figure 17. Pressure Switch Tubing for Downflow Furnaces
(Models *SL054, *SL072, *SL090, & *SL120)
(Models *SM054, *SM072, *SM090, & *SM118)
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