Weil-McLain WM97+70 Specifications download pdf (Page 59)

Part number 550-142-120/0113

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WM97+ gas-fired water boiler — Boiler Manual

Legend — Figure 68

The boiler internal primary/secondary by-pass valve must be CLOSED for multiple boiler installations

piped as shown in this manual. This allows the boiler internal circulator to circulator water to and from the manifolds.

1 Flow/check valve (integral to each boiler internal circulator)

2 Isolation valves (when used)

3 Caps

4 Easy-Fit® Manifold (supply) — layout and size per page 57

5 Easy-Fit® Manifold (return) — layout and size per page 57

6 Primary circulator

7 Expansion tank (diaphragm type)

8 System air eliminator

9 System automatic air vent

13 Cold water supply

17 Boiler circulator — circulates water between boiler and

Easy-Fit® Manifolds

18 System supply

19 System return

20 Boiler relief valve and discharge piping, installed per WM97+ Boiler Manual

21 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 DHW Direct so it will switch to DHW

ﬁring and turn off its boiler circulator on a call for domestic water heating.

22 DHW boiler water supply, typical

23 DHW boiler water return, typical

24 DHW boiler-side circulator and ﬂow/check valve

31 Alternate DHW method — use Weil-McLain WH97+ with Companion Water

Heater (CWH)

Figure 68 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)

Multiple boiler installations

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Weil-McLain WM97+70 Specifications Page 59