Advanced User Guide

Part number 550-100-160/0715
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CONDENSING GAS BOILER — Advanced Manual
™
Legend — Figure 7
1 Flow/check or spring check valve.
2 Isolation valves.
3 Cap.
4 Easy-Fit® Manifold (supply) — layout and size per page 7.
5 Easy-Fit® Manifold (return) — layout and size per page 7.
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 backflow preventer, as required by applicable codes.
12 Isolation valve.
13 Cold water supply.
14 Supply water temperature control (when used).
15 Low water cutoff (when used) (place above primary header).
16 Water flow switch (when used) — locate a flow switch in each
boiler loop if individual protection is required.
17 Boiler circulator.
18 System supply.
19 System return.
20 Boiler P/T gauge, relief valve and discharge piping, installed per
Evergreen boiler manual.
21 Strap system supply and return sensors to lines as shown, at least 6
pipe diameters (but no more than 3 feet) from boiler connection
tees.
22 Boiler drain valves.
Figure 7 Piping schematic — typical piping for multiple Evergreen boilers, using Weil-McLain Easy-Fit manifolds
(adjust boiler connections as required for other boiler models)
Multiple boiler installations (continued)