Figure 63
Piping schematic — typical piping for multiple
ECO
boilers, using Weil-McLain Easy-Fit manifolds
Multiple boiler installations
(continued)
Part number 550-142-190/1218
56
Legend for Figure 63
1
Flow/check valve
2
Isolation valves (when used)
3
Cap
4
Easy-Fit® Manifold (supply) — layout and size per page 55
5
Easy-Fit® Manifold (return) — layout and size per page 55
6
Primary circulator
7
Expansion tank (diaphragm type)
8
System air eliminator
9
System automatic air vent
10
Pressure reducing valve
11
Check valve or backfl ow preventer, as required by
applicable codes
12
Cold water supply
13
Supply water temperature control (when used)
14
Low water cutoff (when used)
15
Water fl ow switch (when used)
16
Boiler circulators
17
System supply
18
System return
19
Boiler P/T gauge, relief valve and discharge piping, installed
per
ECO
Boiler Manual
20
Purge/drain valve
®
S
ERIES
2
G
AS
-
FIRED
WATER
BOILER
—
Boiler Manual
/RQJ
HQG
/RQJ
HQG
PD[
(&2
