Dunkirk Q90-200 Installation, Operation & Maintenance Manual page 11

• Individual boiler discharge piping shall be
independent of other discharge piping.
• Size and arrange discharge piping to avoid
reducing safety relief valve relieving capacity below
minimum relief valve capacity stated on rating
plate.
• Run pipe as short and straight as possible to
location protecting user from scalding and properly
drain piping.
• Install union, if used, close to safety relief valve
outlet.
• Install elbow(s), if used, close to safety relief valve
outlet and downstream of union (if used).
• Terminate pipe with plain end (not threaded).
Figure 8 - Single Zone Boiler Piping
NEAR BOILER PIPING
Figure 9A - Multi-zone Boiler Piping with Circulators
Figure 9B - Multi Zone Boiler Piping With Zone Valves
Supply And Return Lines
The packaged boiler unit is set up to receive 1¼" NPT
supply and return piping from top access.
11
NOTE: When zoning with
circulators, the furnished
circulator pump should be
used as one of the zone
pumps. Each stripped end
of the electrical wires for
the circulator pump inside
the junction box should
be taped or wire nutted
to prevent short circuits.
Unplug the circulator pump
wiring at the integrated
boiler control.