PB Heat 211A manual Correct Piping

TROUBLESHOOTING – SERVICE TIPS

Problem	Possible Cause	Suggested Remedy
Main Gas Valve Opens	Manual Valve Closed at Gas Train	Open Valve
	Manual Valve Closed at Meter	Open Valve
But No Gas Flows
	Test Firing Valve Closed (if Provided)	Open Valve
	Sags in Steam Piping or not enough Pitch	Correct Piping Condition
	Concentric reducers causing condensate pooling	Correct Piping
Water Hammer On Start-Up	Drip trap failed closed	Replace Trap or Trap Element
	Dry returns wetted due to new boiler water line	Correct Piping or Install Feed System and Traps
	higher than old boiler
	No drip line on the back side of a back-pitched	Install Drip Line and Trap
	motorized valve
	Clogged returns on gravity system	Clean or Re-Pipe Return Line(s)
	Incorrect near-boiler piping causing wet steam	Correct Piping per Manual
	to system
	Trap failed open, allowing steam to enter returns	Replace Trap or Trap Element
	{Radiator Hammer} Large radiator may be	Use smaller Air Vent or Use Two Small Vents in
		Place of One Large Vent, One Mounted Higher
	vented too quickly
		than the Other
	Long nipple at Hartford Loop	Replace with Close Nipple
Water Hammer During Mid-Cycle	Water leg or back slope in return line to receiver	Correct Piping
	tank, causing water pocketing
	Trap installed at receiver tank, causing water	Remove Trap at Tank, Installing Drip Traps and
	trapping in return	Radiator Traps where Required
	Boiler feed pump or condensate pump feed rate	Throttle Flow Rate
	too fast, causing spraying into equalizer
	No drip on the inlet side of a forward pitched	Add Drip Line and Trap
	motorized valve
	Uninsulated steam piping, causing excessive	Insulate Steam Pipes
	condensate loads
	Close nipple on Hartford too high	Repipe 2" to 4" (5cm to 10cm) Below Water Line
Water Hammer on Shut-Down	Uninsulated steam piping in boiler room, but
	system piping insulated, causing vacuum	Insulate Steam Pipes
	condition on shut-down
Hammering in the Boiler	Poor circulation in the boiler due to sludge	Clean and Blowdown the Boiler
	accumulation
	Main vents not working	Replace Main Vents, Repiping away from End
		of Lines if Needed
	Drip Traps failed closed	Replace Traps or Trap Elements
No Heat or Poor Heat Distribution	Radiator traps failed open, allowing pressurization	Replace Traps or Trap Elements
	of the returns
in the Building
	Water legs or back slope in return lines to receiver	Correct Piping
	tank, preventing air from venting out receiver vent
	Boiler pressure too high, causing air vents to lock	Reduce Operating Pressure
	up or blowing water loop seals
	New boiler water content smaller than old boiler	Install Boiler Feed System with Receiver Tank
		Large enough for Condensate
	Boiler water feed rate or pump rate too fast
System or Boiler Overfilling or Flooding	causing water level to collapse (due to collapse of	Reduce Feed Rate
	steam bubbles in boiler water)
	Foaming, priming or surging due to poor	Clean the Boiler
	water quality
	Poor water quality, causing foaming and surging	Clean the Boiler
Excessive Water Level Bounce	Incorrect near-boiler piping, such as undersized	Pipe per Manual
	or incorrectly placed risers
	Boiler water feed rate or pump rate too fast	Reduce Feed Rate
	Air vents or traps not venting air, preventing
	steam from getting to radiation and pressurizing	Replace Vents or Traps
Rapid Cycling	the air pocket
	Pressure differential on pressure control too close	Adjust Control Differential
	Nuisance outages of water level control due to	See Excessive Water Level Bounce Above
	boiler water level bounce

47