45
Installation & Operation Manual
DIR #2000543506 00
DOMESTIC
HOT WATER
CIRCULATOR
ANTI-SCALD
MIXING VALVE
COLD
WATER
IN
AIR SEPARATOR
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
MAKE
UP
WATER
HOT
WATER
OUT
BACKFLOW
PREVENTER
PRESSURE
REDUCING VALVE
PRESSURE
GAUGE
EXPANSION
TANK
MIXING VALVES
(TYPICAL)
FLOW CHECK
VALVE
SYSTEM
SUPPLY
SENSOR
MAY SUBSTITUTE
LOW LOSS HEADER
TEMPERATURE
LOOP #1
TEMPERATURE
LOOP #2
TEMPERATURE
LOOP #3
INDIRECT
DHW TANK
Y-STRAINER
(TYPICAL)
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
BOILER 2
(MEMBER 1)
UNION
BOILER 1
(LEADER)
INDIRECT
DHW TANK
BOILER 1
(LEADER)
PRESSURE
RELIEF VALVE
DRAIN
UNION
BOILER 2
(MEMBER 1)
UNION
UNION
TEMPERATURE /
PRESSURE
GAUGE
DRAIN
BOILER
CIRCULATOR
MAKE
WATER
METER
Figure 6-9 Multiple Boilers - Multiple Temperatures - DHW Piped as a Zone
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
6
Hydronic piping
(continued)
CAUTION
Mixing valves are required for the protection of low temperature loops.
Required pipe diameter is based on maximum flow (17 gpm for Models 56 - 156, 27 gpm for Models 200 - 286
and 38 gpm for 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''
Please note that the installer is responsible for ensuring DHW prioritization when piped as a zone.
NOTICE
