46
Installation & Operation Manual
6
Hydronic piping
(continued)
DIR #2000543511 00
INDIRECT
DHW TANK
BACKFLOW
PREVENTER
PRESSURE
REDUCING
VALVE
PRESSURE
GAUGE
ANTI-SCALD
MIXING VALVE
TEMPERATURE /
PRESSURE
GAUGE
AIR SEPARATOR
EXPANSION
TANK
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
MAKE UP WATER
ZONE VALVES
(TYPICAL)
BOILER
CIRCULATOR
BOILER 2
(MEMBER 1)
DOMESTIC
HOT WATER
CIRCULATOR
UNION
(TYPICAL)
PRESSURE
RELIEF VALVE
HOT
WATER
OUT
COLD
WATER
IN
BOILER 1
(LEADER)
DIFFERENTIAL PRESSURE
BYPASS VALVE
(RECOMMENDED)
SYSTEM SUPPLY
SENSOR
SYSTEM
CIRCULATOR
DRAIN
Y-STRAINER
(TYPICAL)
MAY SUBSTITUTE LOW LOSS HEADER
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
ZONE 1
ZONE 2
ZONE 3
ZONE 4
BOILER
CIRCULATOR
BOILER 2
(MEMBER
PRESSURE
RELIEF VALVE
INDIRECT
DHW TANK
CIRCULATOR
BOILER 1
(LEADER)
1)
WATER
METER
Figure 6-11 Multiple Boilers - Single Temperature Zoned with Valves
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
Required pipe diameter is based on maximum flow (17 gpm for Models 56 - 156, 27 gpm for Models 200 - 286
and 38 gpm on Model 400) through all units in Cascade. It is the responsibility of the installer to maintain
flow rates based on system piping requirements.
NOTICE
Model
Recommended Water Pipe Diameter - Cascade
1
Unit
2
Units
3
Units
4
Units
5
Units
6
Units
7
Units
8
Units
56
1"
1 1/4'' 1 1/2'' 1 1/2''
2''
2''
2 1/2'' 2 1/2''
86
1"
1 1/4'' 1 1/2'' 1 1/2''
2''
2''
2 1/2'' 2 1/2''
111
1"
1 1/4'' 1 1/2'' 1 1/2''
2''
2''
2 1/2'' 2 1/2''
156
1"
1 1/4'' 1 1/2'' 1 1/2''
2''
2''
2 1/2'' 2 1/2''
200
1 1/4" 1 1/2''
2''
2 1/2'' 2 1/2''
3''
3''
3 1/2''
286
1 1/4" 1 1/2''
2''
2 1/2'' 2 1/2''
3''
3''
3 1/2''
400
1 1/2"
2''
2 1/2''
3''
3''
3 1/2''
4''
4''
