Weil-McLain Boiler installation manual Review & Comment Only, Confidential, 06-24-03

GAS-FIRED WATER BOILER — Installation Manual — Multiple-boiler Systems

Figure 8 Piping schematic — Typical piping for multiple Ultra boilers, using Weil-McLain Easy-Fit®Manifolds

REVIEW & COMMENT ONLY

CONFIDENTIAL

1	Flow/check valve (each boiler)	8	System air eliminator	15	Low water cutoff (when used) (place above
2	Isolation valves (when used)	9	System automatic air vent		primary header)
				16	Water flow switch (when used)
3	Cap	10	Pressure reducing valve
				17	Boiler circulator (each boiler)
4	Easy-Fit®Manifold (supply), sized per Fig. 6	11	Check valve or backflow preventer, as
	or Fig. 7, page 8		required by applicable codes	18	System supply
5	Easy-Fit®Manifold (return), sized per Fig. 6	12	Isolation valve	19	System return
6	or Fig. 7, page 8	13	Cold water supply	20	Boiler relief valve and discharge piping, installed
	Primary circulator	14	Supply water temperature control (when		per Ultra Boiler Manual
7	Expansion tank (diaphragm type)		used)

06-24-03

This manual provides general guidelines for piping and installation.Your installation must comply with all applicable local codes.

When using isolation valves on each boiler, some codes may require providing a low water control and additional limit for each boiler. If desired, consult the codes to determine if exclusion of the individual boiler isolation valves may allow the use of a single water level control and additional limit for the entire multiple boiler system.

Part number 550-101-232/0703 9