
Installation & Operation Manual
46
7
System piping
Figure 7-7
Double Heater - Double Tank
NOTICE
The piping will not support the weight of the water heater circulator pump. Do not attempt to support
the weight of the water heater circulator pump with the piping or its accessories. Refer to the pump
manufacturer’s installation instructions. Failure to comply could result in severe personal injury, death, or
substantial property damage.
⚠
CAUTION
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.
Model
Number of Units
2
3
4
5
6
7
8
Required Pipe Sizes in NPT (Based on 30
°
△
)
400
2 1/2"
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"
DIR #2000589734 00
CIRCULATION
PUMP
FLOW CHECK
VALVE
TEMPERATURE
GAUGE
T
BUILDING
RECIRCULATION
FILTER
STRAINER / FILTER
TEMPERATURE &
PRESSURE
RELIEF VALVE
BALL VALVE
(TYPICAL)
EXPANSION TANK
MIXING VALVE
UNION
DRAIN PORT
FLOW SWITCH
PIPING
WATER
HEATER
WATER
HEATER
HOT WATER
SUPPLY
COLD WATER
SUPPLY
BUILDING
RETURN
STORAGE
TANK
STORAGE
TANK
T