Install Instructions

38
6A Hydronic piping
Figure 6-4 Multiple Boilers - Single Temperature Zoned with Circulators_COMBI ONLY
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
CAUTION
Mixing valves are required for the protection of low temperature loops.
Model
Number of Units
2345678
Required Pipe Sizes
110 1 1/2" 2" 2" 2 1/2" 2 1/2" 3" 3"
150 2" 2" 2 1/2" 3" 3" 3 1/2" 3 1/2"
199 2" 2 1/2" 3" 3" 3 1/2" 4" 4"
Installation & Service Manual
FIRE TUBE
™
DHW piping omitted for clarity.
NOTICE
BACKFLOW
PREVENTER
PRESSURE
REDUCING VALVE
AIR SEPARATOR
EXPANSION
TANK
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
MAKE UP
WATER
ZONE CIRCULATORS
(TYPICAL)
FLOW CHECK
VALVE
(TYPICAL)
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
UNION
(TYPICAL)
BOILER 1
SYSTEM SUPPLY
SENSOR
(OPTIONAL)
Y-STRAINER
(RECOMMENDED)
(TYPICAL)
MAY SUBSTITUTE LOW LOSS HEADER
ZONE #1
ZONE #2 ZONE #3 ZONE #4
BOILER 2
DIR #2000529699
TEMPERATURE /
PRESSURE GAUGE
TEMPERATURE /
PRESSURE GAUGE
NOTICE:
CASCADE IS FOR
SPACE HEAT ONLY.