Burnham K2WTC - Standard Piping Installation Requirements

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IX. System Piping (continued)
B. 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
9.0. Pipe the outlet of the relief valve to a location where water or stream 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
located on the left side of the heat exchanger.
2. Circulator (required) – The boiler loop circulator is factory installed inside the boiler cabinet. Usually at least
one addition circulator (not supplied) will be required for the system to work properly. See the following section for
more information.
3. 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. If using antifreeze, account for additional expansion of glycol solution
when sizing an expansion tank. In a typical residential heating system, a glycol mixture has an expansion rate about
1.2 times that of water alone, therefore a tank for an anti-freeze system should be at least 1.2 times greater in size.
 4. 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.Ifusingantifreezewithautomaticllvalve,itisrecommendedtoinstallawatermetertomonitor
makeup water. Antifreeze concentration will decrease as makeup water is added. If using antifreeze, local codes
  oftenrequireabackowpreventerordisconnectfromcitywater.
5. 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.
6. 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 11.3 in the Wiring section.
7. 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.
8. 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PartCofthissectionforadditional 
information.
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.