Weil-McLain Aqua Balance WMB-155 Manual page 45

W
TM
AquaBalance
18 Multiple boiler installations
Figure 54
Piping schematic –– typical piping for multiple
1 Flow/check valve
2 Isolation valves (when used)
3 Cap
4 Primary circulator
5 Expansion tank (diaphragm type)
6 System air eliminator
7 System automatic air vent
8 Pressure reducing valve
9 Check valve or backflow preventer, as required by appli-
cable codes
Part number 550-100-305/0118
M -
ALL OUNT GAS FIRED WATER BOILER
Legend for Figure 54
—
Boiler Manual
(continued)
WMB Heating Only boilers
10 Cold water supply
11 Supply water temperature control (when used)
12 Low water cutoff (when used) (place above primary
header)
13 Water flow switch (when used)
14 Boiler circulators
15 System supply
16 System return
17 Boiler P/T gauge (field supplied), relief valve and discharge
piping, installed per WMB
18 Purge/drain valve
Boiler Manual.
45