Part number 550-143-010/1021
26
GV90+
series
2
gas-fired water boiler – boiler manual
Legend — Figure 33
1 Flow/check valve (each boiler)
2 Isolation valves (when used)
3 Caps
4 Easy-Fit® Manifold (supply) — layout and size per
5 Easy-Fit® Manifold (return) — layout and size per
6 Primary circulator
7 Expansion tank (diaphragm type)
8 System air eliminator
9 System automatic air vent
16 Cold water fill line — see
for typical com-
ponents
17 3-way diverting valve (operated by DHW aquastat — valve end
switch connects across boiler thermostat terminals)
18 System supply
19 System return
20 Boiler relief valve and discharge piping, installed per GV90+
Boiler Manual
21 Indirect-fired storage water heaters — Example is shown con-
nected to one boiler of the system. The indirect water heater could
also be connected with a secondary connection off the main
header, as in
.
Figure 33
Piping layout — typical for multiple GV90+ boilers, using Weil-McLain Easy-Fit manifolds (2-boiler system)
Multiple boiler water piping
(continued)
