User Guide

44
C: Standard Piping Installation Requirements
Observe the following requirements when installing the boiler piping:
 1) ReliefValve(Required)–ThereliefvalveisshippedlooseandmustbeinstalledinthelocationshowninFigure
  9.6,usingthesideoutletTeeandotherttingsprovided.ASMESectionIVcurrentlyrequiresthatthisrelief 
valve be installed above the heat exchanger as shown. Pipe the outlet of the relief valve to a location where water
or steam will not create a hazard or cause property damage if the valve opens. The end of the discharge pipe must
terminate in unthreaded pipe. If the relief valve discharge is not piped to a drain, it must terminate at least 6” above
  theoor.Donotrunthedischargepipingthroughanareathatispronetofreezing.Theterminationoftherelief
valve must be in an area where it is not likely to become plugged by debris.
The relief valve supplied with the boiler is set to open at 30 psi. If it is replaced, the replacement must have
a setting less than or equal to the maximum allowable working pressure (MAWP) shown on the ASME data plate.
2) Gauge (Required) - Indicates supply water pressure and temperature. This gauge is shipped loose. Install it as shown
in Figure 9.6.
 3) Circulator(required)–Theboilerloopcirculatorissuppliedbytheinstallerandmustbesizedtoprovidethe 
  requiredboilerowrate.Usuallyatleastoneadditionalcirculatorwillberequiredforthesystemtoworkproperly.
See the previous section for more information.
 4) ExpansionTank(required)–If this boiler is replacing an existing boiler with no other changes in the system,
the old expansion tank can generally be reused. If the expansion tank must be replaced, consult the expansion tank
  manufacturer’sliteratureforpropersizing.
 5) FillValve(required)–Eitheramanualorautomaticllvalvemaybeused,butamanualvalveispreferredbecause
  iteliminatesunmonitoredadditionsofmake-upwatertothesystem.Theideallocationforthellvalveisatthe
expansion tank.
 6) AutomaticAirVent(required)–Atleastoneautomaticairventisrequired.Manualairventswillusuallyberequired
  inotherpartsofthesystemtoremoveairduringinitialll.
7) Manual Reset High Limit (required by some codes) - This control is required by ASME CSD-1 and some
other codes. Install the high limit in the boiler supply piping just above the boiler with no intervening valves. Set
the manual reset high limit to 200°F. Wire the limit per Figure 10.3 in the Wiring section.
8) Isolation Valves (recommended) - Isolation valves are useful when the boiler must be drained, as they will eliminate
  havingtodrainandrelltheentiresystem.
 9) Strainer(recommended)–InstallaYStrainer,orothersuitablestrainer,topreventanysystemdebrisfromentering
  theboilerandfoulingthewaterpassages.Notethatsomestrainershaveasignicantpressuredrop,whichmay 
  impacttheabilityoftheboilerpumptoobtaintherequiredow.SeesectionBforadditionalinformation.
 10) DrainValve(required)–InstallthedrainvalvesuppliedasshowninFigure9.6.
DANGER
Explosion / Scald Hazard
Pipe relief valve discharge to a location where the potential of severe burns is eliminated.
Do not install a relief valve having a setting greater than the MAWP shown on the rating
plate.
Do not install a valve in the relief valve discharge line.
Do not install relief valve in a location other than that specied by the factory.
Do not plug the relief valve discharge.