27 N O ZK 2 OM 0 0 5 0 1 A F 2 S e tt ing o f OUT2 S et O UT 2 S et O N an d O F F po i nts of t he s up pl y p i l ot v al v e a nd t he r an ge i n whi c h an i np ut is no t a l l o w ed O p er atio n of O UT 2 S up pl y p i l ot v a l v e O UT 2 i s tu r ne d on b y the s i g na l f or s uc ti on S uc t i on s t arts b y th e g e ne r at i on of v ac u u m pres s ure W h en th e v ac uu m pres s ure r ea c he s th e s et v a l ue P 1 H3 O F F po i nt of s up p l y pi l ot v a l v e s i gn a l the s up pl y p i l ot v a l v e i s t urned of f A f ter tha t whe n t h e v ac uu m l ev el d ec r ea s es an d reac he s th e s uc ti o n s w i tc h ON po i nt P 1 H 2 S up pl y pi l ot v a l v e s i g na l O N p oi n t th e s u pp l y pi l ot t urns on ag ai n to m ai nta i n t he v ac u um A f ter the s u pp l y pi l ot v a l v e i s tu r ne d of f th e v ac u um pr es s ure wi l l de c r ea s e W h en th e v ac uu m pres s ure r ea c he s th e s uc t i on s wi tc h O N po i nt P 1 H2 O N po i nt of s up p l y p i l o t v a l v e s i g na l th e s ol e no i d v a l v e f or s up pl y wi l l t urn O N ag a i n an d i nc r e as e th e v ac uu m pres s ure A f terwar ds T he s up p l y pi l o t v a l v e rep ea ts t hi s O N an d O F F c y c l e A r ea i n whi c h s e tti ng of H 2 i s pro hi bi t ed c an be s e t b y th e ran ge i n whi c h H4 s up p l y pi l ot v a l v e s i gn a l i s prohi bi t ed t o i np u t T he de f au l t s ett i n gs are P 1 70 0 k P a H 11 0 0 k P a H 25 0 k P a H 30 0 k P a H 41 0 k P a A