Connect piping – steam boilers (continued)
General
Failure to properly pipe the boiler may result in
improper operation and damage to the boiler or
building.
Steam supply must be on same end as controls.
Return may be from either end.
1. Install the boiler jacket before connecting return piping. (Sup-
ply pipng can be connected before or after jacket installation.)
Connect controls after all piping is connected.
2. See Table 7 for recommended pipe sizing.
3. See Figure 5, page 10, for tapping locations.
4. EGH only - install 3/4” system blow-off (drain) valve in lowest
part of return piping close to boiler.
Condensate return —
• Satisfactoryoperationofasteamheatingsystemdepends
on adequate condensate return to boiler to maintain a
steady water level.
• Avoidaddingrawmakeupwater.
• Where condensatereturnis notadequate, installlow
water cutoff/pump control, condensate receiver and
condensate boiler feed pump. Refer to Table 5, page 16,
for sizing.
Connecting to parallel-flow piping
1. See Figure 18 for parallel-flow steam systems.
Connecting to counterflow piping
When connecting to a counterflow system, the boiler steam sup-
ply must connect into the top of the counterflow system header,
as shown in Figure 19.
Figure 18 Recommended piping for parallel-flow systems
Table 7 Recommended steam boiler pipe sizing
Steam Boiler Piping Minimum Recommended Pipe Sizes
Boiler Model Riser Pipe Size
Header *
H
Equalizer
J
A B
EG-30, 35
PEG-30,35
2” – 2” 1 ¹⁄₂”
EG-40, 45, 50
PEG-40, 45, 50
2 ¹⁄₂” – 2 ¹⁄₂” 1 ¹⁄₂”
2” – 2” 1 ¹⁄₂”
EG-55, 65, 75
PEG-55, 65
3” – 3” 1 ¹⁄₂”
EGH-85, 95 2” 2” 3” 1 ¹⁄₂”
EGH-105 2 ¹⁄₂” 2 ¹⁄₂” 3” 1 ¹⁄₂”
EGH-115, 125 2 ¹⁄₂” 2 ¹⁄₂” 4” 1 ¹⁄₂”
*
24” minimum from waterline to header.
Part Number 550-110-639/0512
17
EG
•
PEG
•
EGH Gas-firEd boilErs — sEriEs 4 — boilEr manual
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