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Weil-McLain 80 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners
8
required for steam boilers. Use the Hartford loop for
both pumped-return and gravity-return systems.
energized by boiler-mounted pump controller. Install
Install piping as shown on pages 16 through 18 for single
boilers. See page 19 for additional requirements when
piping multiple boilers.
a. See Table 7.
1) Size condensate return piping by pump.
2) Size gravity condensate return same as equalizer
b. Install system drain valve in lowest part of return
shown in Table 6, page 14.
Figure number
15
16
17
Notes:
1. Based on ASHRAE Handbook recommendations, allowing ½ oz. pressure drop per 100 feet of pipe for dry return.
2. Based on ASHRAE Handbook recommendations, allowing 2 oz. pressure drop per 100 feet of pipe at 3.5 psig. Maintain minimum 24" height
from waterline to header.
16
Improperly piped systems or undersized
piping can contribute to erratic boiler
operation and possible boiler or system
damage. Piping system must be installed
as shown, using pipe sizes shown. Pipe
sizes shown are for two-pipe, pumped-
needed when connecting to gravity-re-
distributor or sales office before installing
alternate piping.
"J" pipe size.
Steam boiler pipe size for typical 2-pipe steam systems
Boiler model
number
380
480
580
680
780
880
980
1080-1280
a. Satisfactory operation of any steam heating system
depends on adequate return of condensate to
maintain steady water level.
water.
water cutoff with pump control, condensate
receiver, and condensate boiler feed pump should
be installed. Refer to page 18, Figure 18 for piping
and Table 8 for sizing.
3. Multiple steam boiler piping
a. See page 19.
Riser pipe size
inches
Note 1
A
B
C
3
--
--
4
--
--
4
--
--
3
3
--
4
4
--
4
4
--
4
4
--
4
4
4
Cold water fill piping
"H"
Header
Equalizer
inches
inches
Note 2
3
4
4
4
4
4
6
6
Part No. 550-141-935/0215
"J"
2
2
2 ½
2 ½
2 ½
3
3
3
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