Weil-McLain WM97+100 Manual page 62

WM97+ Series 2
Multiple boiler installations
Piping layout — typical piping for multiple WM97+ boilers, using Weil-McLain Easy-Fit manifolds (2-boiler
system) (shown using WM97+155 boilers — adjust boiler connections as required for other boiler models)
Flow/check valve (integral to each boiler internal circulator).
Isolation valves (when used).
Caps.
Easy-Fit® Manifold (supply) — layout and size per page 60.
Easy-Fit® Manifold (return) — layout and size per page 60.
Primary circulator.
Expansion tank (diaphragm type).
System air eliminator.
System automatic air vent.
Cold water supply.
Boiler circulator — circulates water between boiler and
Easy-Fit® Manifolds.
– 62 –
-
GAS FIRED WATER BOILER
piped as shown in this manual. This allows the boiler internal circulator to circulator water to and from the manifolds.
System supply.
System return.
Boiler relief valve and discharge piping, installed per WM97+ Boiler Manual.
Indirect-fired storage water heaters (Weil-McLain PLUS Line shown) — Example
is shown connected to one boiler of the system. Preferably, use the last boiler in
the lead/lag sequence and set its Priority to
firing and turn off its boiler circulator on a call for domestic water heating.
DHW boiler water supply, typical.
DHW boiler water return, typical.
DHW boiler-side circulator and flow/check valve.
Alternate DHW method — use Weil-McLain WM97+ with Aqua Logic (CWH).
— Boiler Manual
(continued)
for multiple boiler installations
so it will switch to DHW
Part number 550-142-204/0117