13
Figure 15 – Single Installation Piping Diagram, Model IW
Figure 14 – Dual Installation Piping Diagram, Model IW
NOTES:
1. All water connections 2" N.P.T. models.
2. Drain valve per ASME requirements.
3. A loop circulator is required to maintain forced circulation in the building hot water piping system.
NOTES:
1. All water connections 2" N.P.T. models.
2. Drain valve per ASME requirements.
3. A loop circulator is required to maintain forced circulation in the building hot water piping system.
Gas
Supply
Flow Switch -
Factory Mounted
and Wired
Drain Valve
(See Note 2)
Cold Water
Supply
Building Loop
To Building
Service
Connections
Building Loop
Circulator
(See Note 3)
Building Loop
To Minimum
Pipe Size
1" Thru 850
1-1/4" 1010 Thru 1825
Service Valves For
Heater Isolation
Available In Stage
Or Modulated Firing
Model IW Water Heater
This Seqment Of Piping
Must Be Same Size As
Water Heater Connection
*
*
Service Valves For
Heater Isolation
To
Drain
To
Drain
Gas Supply
Flow Switch -
Factory Mounted
and Wired
Drain Valve
(See Note 2)
Cold Water
Supply
Check Valve
Building Loop
To Building
Service
Connections
Building Loop
Circulator
(See Note 3)
Check Valve
Service Valves For
Heater Isolation
Available In Stage
Or Modulated Firing
Model IW Water Heater
This Seqment Of Piping
Must Be Same Size As
Water Heater
Connection
*
*
