Williamson-Thermoflo GWC-070 Manual page 14

GWC -
gas fired water boiler
Install water piping
Piping to single-zone system using diaphragm- or
Figure 14
bladder-type expansion tank. Boiler connections are
1" NPT (supply from 1" tee, return to 1" recuperator
flange).
Pipe diaphragm- or bladder-type expansion tanks to the bot-
tom of the separator.
Pipe closed-type (air in contact with water) tanks to the top of
the air separator. Always connect the fill line to the expansion
tank location, as shown above and in the suggested piping.
Relief valve discharge piping — see page 12
1
Isolation valves
2
Fill valve
3
Diaphragm-type expansion tank — always locate as
4
shown in the suggested piping drawings in this manual
Air separator
5
• provide with automatic air vent ONLY when used
with diaphragm-type expansion tanks
• pipe air outlet to expansion tank when used with
close-type tanks
14
— Boiler Manual
(continued)
Legend
Cold fill line, with backflow preventer or check valve
6
when required by codes (see Figure 15 for typical com-
ponents)
System supply piping
7
System return piping
8
Pressure reducing valve, when used
10
Quick-fill bypass valve, when used
11
Closed-type expansion tank — always locate as shown
12
in the suggested piping drawings in this manual
Tank fitting
13
Piping closed-type expansion tank
Figure 15
Part number 550-142-056/0411