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MaincomponentsReplacementInstructions
1.Closethegasshutovalve.
2.Turnthepowero.
3.DisconnecttheelectricalconnectiontotheAPS.
4.Separatehosefromairpressureswitch.
5.Loosenbracket’stwoscrewsandseparate
airpressureswitchfromthecabinet.
6.Replaceairpressureswitchwithnewcomponent.
7.Assembleinthereverseorderasthepartwasremoved.
8.Openthegasshutovalve.
9.Turnthepoweron.
10.Openwatervalves(HotwaterandDHW)
11.Turntheunitonandensureproperoperation.
Chapter5ReplacementInstructions
5.AirPressureSwitch
Connectahosetotheconnectormarked'H'character.