ECR International UTICA HEATING UH15B-K Installation, Operation & Maintenance Manual page 16

With hydrolevel 4200 control cast iron gas fired boilers for forced hot water
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4 - CONNECTING SUPPLY AND RETURN PIPING
PIPING LEGEND:
BACK FLOW VALVE
Figure 4-7 - Bypass Piping (4-Way Valve Option With Circulator On Supply side)
Back Flow
Valve
ASME
RELIEF
VALVE
Drain
Valve
16
PN 240013259 Rev. D [08/15/2021]

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