40
Installation & Service Manual
4
Water connections
Figure 4-4_Primary/Secondary Piping of Multiple Boilers
COMMON MANIFOLD SIZE (Min.)
Models: 402, 502, 652, & 752
Number of Units
GPM
Diameter
(in.)
2
110
3
3
165
3 1/2
4
220
4
5
275
5
6
330
5
7
385
6
8
440
6
COMMON MANIFOLD SIZE (Min.)
Models: 992, 1262, 1442, 1802 & 2072
Number of Units
GPM
Diameter
(in.)
2
180
4
3
270
5
4
360
6
5
450
6
6
540
6
7
630
8
8
720
8
MAKE-UP
WATER
PRESSURE
RELIEF
VALVE
EXPANSION
TANK
LOW WATER
CUT-OFF
(OPTIONAL)
SYSTEM
PUMP
TO SYSTEM
12" OR 4X
PIPE DIAMETERS
FROM
SYSTEM
SECONDARY
BOILER
PUMP
AIR
SEPARATOR
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.
NOTICE