Install Instructions

45
7 Hydronic piping (continued)
DIR #2000585756 00
INDIRECT
DHW
TANK
BOILER 1
TP
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
TP
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
TP
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.  e installer must follow all manufacturer’s instructions for each system component.  e
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 5678
Required Pipe Sizes in NPT (Based on 30°△)
400
2.5 3 4 4 6 6 6
500
3 4 4 4666
650
3 4 4 6666
800
4 4 6 6668
1000
4 6 6 6888
Installation & Operation Manual