Lochinvar WH 55-399 operation manual Near boiler piping connections, Circulator sizing

Installation & Operation Manual

6 Hydronic piping (continued)

Near boiler piping connections

Figure 6-1ANear Boiler Piping				Figure 6-1BNear Boiler Piping w/Low Loss Header
					AIR
	AIR				VENT
	VENT
			DOMESTIC	OUTLET
			HOT WATER						DOMESTIC HOT
				INLET
OUTLET			PUMP
									WATER PUMP
INLET			INDIRECT						M
			DOMESTIC	CONDENSATE				O
		M					R		INDIRECT
						F
	O		HOT WATER
	FR			DRAIN					DOMESTIC
CONDENSATE		O	TANK						HOT WATER
DRAIN	T		M			O			TANK
						T
			E
			T
			S							SYSTEM
			Y
BOILER			S
			O
PUMP			T
					SYSTEM				TO	FROM	SYSTEM
					SENSOR
					AIR	VALVE
TO FLOOR			SYSTEM	TO FLOOR	SEPARATORCHECK
DRAIN			PUMP	DRAIN	AIR VENT
					VALVE				SYSTEM
				BOILER
									PUMP
				PUMP
Y-STRAINER	AIR								FILL VALVE
(RECOMMENDED)
	SEPARATOR
M
E				Y-STRAINER
T	EXPANSION TANK
S
SY				(RECOMMENDED)
M									EXPANSION TANK
O
R
F

LOW LOSS HEADER		DRAIN (TYPICAL)
(TYPICAL)	DRAIN VALVE

Circulator sizing

The Knight wall mount boiler heat exchanger does have a pressure drop, which must be considered in your system design. Refer to the graph in FIG. 6-2 for pressure drop through the Knight wall mount boiler heat exchanger.

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