Roberts Gorden CoRayVac CRV-B-9 - Manual (Page 56)

CRV-S ERIES I NSTALLATION , O PERATION AND S ERVICE M ANUAL
50
FIGURE 35: Vacuum Reading
Insert tubing
about 6" (15 cm).
Combustion Chamber
at end position
End Vent
Manometer
6
5
4
3
2
1
0
1
2
3
4
5
6
Approximate reading after
adjusting damper couplings and
pump inlet. ( 2.5"- 3.0" w.c.) ~~