UTICA BOILERS UH15B-K Installation, Operation & Maintenance Manual page 16

Cast iron gas fired for forced hot water with resideo control
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Figure 4-7 - Bypass Piping (4-Way Valve Option With Circulator On Supply side)
4 - CONNECTING SUPPLY AND RETURN PIPING
Piping legend:
BACK FLOW VALVE
Back Flow
Valve
ASME
Relief
Valve
Drain
Valve
16
PN 240012809, Rev. D [08/15/2021]

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