12
Figure 13 – Split System Piping Diagram, Model IW
Figure 12 –Hot Water Supply System Using Model PW with Dual Tanks, Building Loop Return and Circulating Pump
NOTES:
1. Heavy line
indicates Heater to Tank Circulating Loop.
2. When a very large volume of water is circulated in the building loop with the use of a separate pump, tee building loop into cold water
supply and return to storage tank.
CAUTION:
1. This piping arrangement is required on split systems to provide constant hot water temperatures.
2. Pipe size and length must conform to the recommendations for each heater model.
3. A loop circulator is required to maintain forced circulation in the building hot water piping system.
Cold
Water
Supply
Return
Loop
Pump
(see note 2)
Check
Valve
To Drain
Conventional
Tank
To Drain
To Drain
Recommended Increasing
One Pipe Size From C.W.
Connection To Tanks
Optional Cold Water Supply
When Adequate Tank Opening
Not Available
Service Valves
Pressure
Relief
Valve
Service Valve
Hot Water
Return
From
Building
Hot Water
To Building
Service Valve
Conventional
Tank
Gas Supply
Flow Switch -
Factory Mounted
and Wired
Drain Valve
Cold Water
Supply
Check Valve
Building Loop
Circulator
(See Note 3)
Service Valves For
*Heater Isolation
To Building Service
Connections
Model IW
Water Heater
Building Loop
Circulator
(See Note 3)
*This Section Of Piping Must Be Same
Size As Water Heater Connection
Building Loop
Minimum
Pipe Size
1" Thru 850
1-1/4" 1010 Thru 1825
Pressure
Relief
Valve
Check Valve
