Lochinvar 399 Number of Units, Manifold Pipe Sizes in Inches mm, 6Hydronic piping, Model

Installation & Operation Manual

6Hydronic piping

Figure 6-8Multiple Boilers - Primary/Secondary Piping

			Number of Units
Model	2	3	4	5	6	7	8
	Manifold Pipe Sizes in Inches (mm)
399	2 1/2 (64)	3 (76)	3 1/2 (89)	4 (102)	4 (102)	5 (127)	6 (152)
500	3 (76)	3 1/2 (89)	4 (102)	5 (127)	5 (127)	6 (152)	6 (152)
600	3 1/2 (89)	4 (102)	5 (127)	5 (127)	6 (152)	6 (152)	8 (203)
700	3 1/2 (89)	5 (127)	5 (127)	6 (152)	6 (152)	8 (203)	8 (203)
800	4 (102)	5 (127)	5 (127)	6 (152)	8 (203)	8 (203)	8 (203)

MAY SUBSTITUTE

LOW LOSS HEADER

AIR SEPARATOR

DRAIN POINT (TYPICAL)

SYSTEM SUPPLY SENSOR (WHEN USED)

SYSTEM CIRCULATOR

BALL VALVE (TYPICAL)

M E T S Y S M O R F

4 D E E C X E O T T O N

	T
	R
	A
	P
	A
	"
2
1
F
O
.
X
A
M
R
O
IA
D
E
IP
P

MAKE UP WATER

M
E
T
S	EXPANSION
Y
S
O	TANK
T
BACK FLOW
PREVENTER
PRESSURE REDUCING
VALVE
PRESSURE GAUGE
INDIRECT DHW
TANK
ANTI-SCALD
MIXING VALVE
HOT WATER OUT
DOMESTIC
HOT WATER
CIRCULATOR	UNION (TYPICAL)
COLD WATER IN
FLOW CHECK	Y-STRAINER
VALVE (TYPICAL)
	(TYPICAL)
	(RECOMMENDED)

BOILER CIRCULATOR (TYPICAL)

BOILER 4 (MEMBER 3)

BOILER 3 (MEMBER 2)

BOILER 2 (MEMBER 1)

BOILER 1 (LEADER)

PRESSURE RELIEF

VALVE

DRAIN

TEMPERATURE /

PRESSURE GAUGE

NOTICE

NOTICE

Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.

System flow should always remain higher than the required flow for the boiler(s) when the boiler(s) is in operation to prevent short cycling and high limit issues.

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