Natco Fire-Coil 175-400 Installation And Operation Instructions Manual page 13

Natco Fire-Coil Volume Water Heaters
Cold
Water
Figure 20. Hot water supply with vertical tank.
Hot Water
Return from
Building
Check
Valve
Bldg.
Loop
Circ.
Pump
Note:
Heavy line
Figure 21. Hot water supply with horizontal tank.
Hot Water
to Building
Hot Water
Return from
Building
Throttling
Valve
Check
Valve
Bldg.
Loop
Circ.
Pump
Conventional
Tank
Hot Water
to Building
24-Inch
Min.
Cold
Water
indicates heater-to-tank circulation loop.
Optional Cold Water Supply
When Adequate Tank Opening
Not Available
Heater
Service
Valve
To Drain
Conventional
Tank
Heater
Drain
Service
Valves
To
Drain
Pump
To
Drain
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