Dunkirk DXL Series Installation, Operation & Maintenance Manual page 16

Cast iron gas fired boilers for forced hot water with hydrolevel control
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4 - CONNECTING SUPPLY AND RETURN PIPING
PIPING LEGEND:
BACK FLOW VALVE
Figure 4-6 - Single Zone System With DHW Priority
Back Flow Valve
ASME
RELIEF
VALVE
Purge
DRAIN
Valve
VALVE
16
PN 240012787 Rev. C [11/15/2020]

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