Weil-McLain 88 - Manual (Page 18)

Weil-McLain 88 Water and steam boilers — Series 2 — for Gas, Light Oil, & Gas/Light Oil-Fired Burners
18 Part No. 550-100-068/1009
Connect steam boiler piping
(continued)
Drawing legend & notes
(Figure 23 through Figure 26)
Riser pipes (one for each supply intermediate section) 
Horizontal pipes needed to offset the header to allow for expansion and contraction of the header 
Steam supply must be located between last riser connection and equalizer elbow 
Equalizer elbow — full size or reducing 
Equalizer pipe 
Close nipple at Hartford loop tee to reduce water hammer potential 
Condensate return line (gravity or pumped) 
Minimum 4 inches between water line and top of Hartford loop return nipple 
Boiler water line — all automatic water level controls must be set to maintain this level 
Minimum 24 inches between water line and bottom of header