8
PN 240013666 REV. A [06/30/2022]
ACCESS*
FRONT
ACCESS*
10"MIN.*
(S)
(R)
(S)
(R)
(S)
(R)
(B)
SYSTEM
SUPPLY
SYSTEM
RETURN
(B)
Typical Layouts for Hot Water Heating Systems
Figure 3 - Room Sizing - Parallel Reverse Return (3 Boilers shown)
Note:
• Access
*
is minimum 24” service clearance�
• Vent position, relief valve location, supply and return piping will vary depending on type of units�
LEGEND - PIPE SIZING
(S),(R)
- 1¼ NPT BOILER SUPPLY AND RETURN
(B)
- HEADER SIZING - REFER TO TABLE 3
(Supply & Return at Same Wall of Boiler Room)
