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Weil-McLain 80 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners
7
water flow through boiler that must not be used.
Install piping as shown in Figure 12 for single boilers. For multiple boilers,
see Figure 13, page 15.
Improperly piped systems or undersized piping can contribute
to erratic boiler operation and possible boiler or system
damage.
a. Size according to tables below.
1) For
temperature rise through boiler.
2) For
piping per Table below.
Flow at higher rates than shown in Table below for pipe size
can damage boiler, causing substantial property damage.
c. For return piping, use full diameter pipe for 10 times that diameter
be reduced any closer to boiler return tapping than 40 inches.
a.
at least 1 inch per each 5 feet of piping.
b.
Recommended minimum pipe sizes when flow rate is
not known (see Figure 12)
Boiler model number
Supply pipe size
380
480
580– 680
780–1280
14
, size piping per Table below, using 20°F.
through boiler, size
Return pipe size
A
B
2"
2"
2½"
2½"
3"
3"
4"
4"
Recommended minimum pipe sizes for
known flow rates.
:DWHU ÀRZ UDWH
Supply pipe size
A
GPM
Up to 35
2"
36–50
2½"
51–77
3"
78–142
4"
ASME drain valve size
Boiler model number
380 – 480
580 – 1180
1280
Water boiler piping, typical
Part No. 550-141-935/0215
Return pipe size
B
2"
2½"
3"
4"
Valve size
¾"
1"
1¼"
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