45
7
Hydronic piping
(continued)
DIR #2000585756 00
INDIRECT
DHW
TANK
BOILER 1
T P
MAKE UP
WATER
P
TO
SYSTEM
MULTI TEMP.
LOOP CNTL
(OPTIONAL)
FROM
SYSTEM
TEMP
LOOP 3
TEMP
LOOP 2
TEMP
LOOP 1
24VAC SIGNAL TO
MIXING VALVES
SHIELDED CABLE
TO BOILER
120VAC
TO PUMPS
WIRES TO
LOOP SENSORS
SENSOR 1
PUMP 1
VALVE 1
SENSOR 3
SENSOR 2
PUMP 3
PUMP 2
VALVE 3
VALVE 2
SENSOR 1
SENSOR 2
SENSOR 3
PUMP 1
PUMP 2
PUMP 3
VALVE 1
VALVE 2
VALVE 3
LEGEND
AIR SEPARATOR
CIRCULATION
PUMP
FLOW CHECK VALVE
PRESSURE GAUGE
P
TEMPERATURE &
PRESSURE GAUGE
T P
SYSTEM SUPPLY
SENSOR
BACKFLOW
PREVENTER
MAGNETIC SEPARATOR
WATER METER
STRAINER / FILTER
PRESSURE
REDUCING VALVE
PRESSURE RELIEF
VALVE
BALL VALVE
EXPANSION TANK
PIPING
DRAIN PORT
DIFFERENTIAL
PRESSURE
BYPASS VALVE
2 WAY MOTORIZED
VALVE (OPTIONAL)
MIXING VALVE
ANTI SCALD
FLOW SWITCH
WIRING
BOILER 2
T P
COLD
WATER IN
DHW HOT
WATER OUT
Figure 7-6
Multiple Boilers - Multiple Temperatures
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment. The installer must follow all manufacturer’s instructions for each system component. The
installer is responsible for compliance with local codes.
NOTICE
CAUTION
Mixing valves are required for the protection of low temperature loops.
CAUTION
Indirect water heaters are capable of transferring a limited number of Btu’s into the water. Ensure boiler
output does not not exceed indirect water heater transfer capabilities.
Model
Number of Units
2
3
4
5
6
7
8
Required Pipe Sizes in NPT (Based on 30°
△
)
400
2.5
3
4
4
6
6
6
500
3
4
4
4
6
6
6
650
3
4
4
6
6
6
6
800
4
4
6
6
6
6
8
1000
4
6
6
6
8
8
8
Installation & Operation Manual
