Weil-McLain WTGO Installation And Start-Up Manual page 19

WTGO
GOLD OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 —
Connect water piping
Figure 9
Piping with DIAPHRAGM expansion tank
Cold water
To diaphragm
expansion tank
(Alternate circulator location)
Figure 10
Piping with CLOSED expansion tank
Isolation
valve
(Alternate circulator location)
Part number 550-141-825/1211
SERVICE TECHNICIAN ONLY — read and follow completely.
(continued)
Circulator
Automatic
air vent
From
system
Isolation
valve
fill
and fittings
Circulator
Circulator
From
system
Circulator
"B1" tapping
Boiler Manual
Isolation
To system
"B1" tapping
Closed type expansion tank
Cold water fill
Isolation valve
To system
"C" tapping
"N" tapping
Relief
valve
valve
"C" tapping
"N" tapping
Relief
valve
19