Connect Steam Boiler Piping - Weil-McLain 78 Manual

• Installation
6a

Connect Steam Boiler Piping

Cold
water fill
Manual
isolation
valve
Part No. 550-141-705
All manuals and user guides at all-guides.com
• Start-Up • Maintenance
General steam piping information:
•
Hartford Loop piping arrangement and wet
return are required for steam boilers.
• Maintain 24-inch minimum from waterline to
bottom of header (56-1/4" from bottom of
section).
• When using condensate receiver, feed pump
must be energized by boiler-mounted pump
controller.
Check
Water meter
valve
Pressure
reducing valve
(when used)
Manual
isolation
valve
Figure 14 Cold Water Fill Piping
Fig. Boiler
No. Model
15 378
15 478
15 578
16 678
16 778
16 878
16 978
17 1078-1278
* Based on ASHRAE Handbook recommendations, allowing 1/2 oz. pressure drop per 100 feet of pipe for dry return.
**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.
• Parts
Install piping:
Install piping as shown on page 16 for single
boilers, page 18 for multiple boilers.
1. Connect supply and return piping:
a. See table below and:
1)Size forced condensate return piping by
2)Size gravity condensate return same as
To condensate
b. Install system drain valve in lowest part of
return piping or
return piping close to boiler. ASME size
condensate
requirements are shown in Table, page 13.
receiver
c. Connect cold water fill piping as shown in
(see fig. 18,
Figure 14. Also shown are recommended
page 17)
valves and water meter, if used. Water meter
will detect added makeup water, indicating
leaks in system.
Steam Boiler Pipe Size Table
Based on 2-Pipe Steam System
*Riser
Pipe Size - In.
A B C
3
4
4
3 3
4 4
4 4
4 4
4 4 4
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. Consult local Weil-
McLain distributor or sales office
before installing alternate piping.
pump.
equalizer "J" pipe size.
* *
H
Header Equalizer
In.
3
4
4
4
4
4
6
6
J
In.
2
2
2-1/2
2-1/2
2-1/2
3
3
3
15