Weil-McLain CGA25SPDN manual 3b Water piping - single-zonesystem, Closed-typeexpansion tank

GOLD CGa Gas-Fired Water Boiler — Boiler Manual

3b Water piping — single-zone system

Undersized expansion tanks cause system water to be lost from relief valve and makeup water to be added through fill valve. Eventual section failure can result.

Diaphragm-type or bladder- type expansion tank (Figure 9)

1.Ensure expansion tank size will handle boiler and system water volume and temperature. Tank must be located in boiler return piping as close to boiler as possible, before inlet side of circulator. See tank manufacturer’s instructions for details.

2.Install an AUTOMATICMAIRTVENT as shown.

Closed-type expansion tank

(Figure 10)

1.Ensure expansion tank size will handle boiler and system water volume and temperature. See tank manufacturer’s instructions for details.

 #ONNECTNTANK TO v .040TAPPINGPLOCATEDABEHIND SUPPLY OUTLETL USINGI v .040 PIPINGI 0ITCHT ANY horizontal piping up towards tank 1 inch per 5 feet of piping.

Use &IGURE  or &IGURE  only for single-zone systems designed for RETURN WATERTAT LEASTA —& For systems with low return water temperature possible, such as converted gravity systems and radiant heating systems, refer to the special piping suggestions of pages 20-25. Failure to prevent low return water temperature to the boiler could cause corrosion of the boiler sections or burners, resulting in severe personal injury, death or substantial property damage.

&IGURE 	Diaphragm- or bladder-type expansion	&IGURE R Closed-type expansion tank — Single-
	tank — Single-zone system using dia-	zone system using closed-type expan-
	phragm-type or bladder-type expansion	sion tank. See Table 3 for piping sizes.
	tank. See Table 3 for piping sizes.

Part Number 550-101-009/0107 17