Diaphragm Expansion Tank (Figure 11); Closed Expansion Tank (Figure 12) - Weil-McLain WGO 4 Series Manual

WGO
OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 —
Connect water piping
Figure 11
(Alternate circulator location)
Figure 12
Part number 550-142-331/0421
SERVICE TECHNICIAN ONLY — read and follow completely.
(continued)
Piping with DIAPHRAGM expansion tank
Circulator
Automatic
air vent
From
system
Isolation
valve
Cold water
fill
To diaphragm
expansion tank
and fittings
Circulator
Piping with CLOSED expansion tank
From
system
Isolation
valve
Circulator
(Alternate circulator
location)
Boiler Manual
"B1" tapping
Circulator
"N" tapping
"B1" tapping
Isolation
valve
To
system
"C" tapping
"N" tapping
Relief
valve
Closed type expansion tank
Cold water fill
Isolation valve
To system
"C" tapping
Relief
valve
19