Hubbell Electric Heater Company WATER HEATER DF - Manual (Page 14)

14
GAS CONNECTION PIPING FOR GAS AND COMBINATION GAS/OIL BURNERS
WARNING / CAUTION
LP UNITS; liquefied petroleum (L.P.) gas is heavier than air and will remain at floor level if there is
a leak. Basements, crawl spaces, closets and areas below ground level will serve as pockets for
accumulation of leaking L.P gas. Before operating the water heater, sniff at floor level. IF YOU
SMELL GAS, follow applicable instructions on cover page. DO NOT OPERATE APPLIANCE
UNTIL LEAKAGE IS CORRECTED AND AREA IS PURGED OF ANY GAS
ACCUMULATION.
Be sure gas supply lines have been cleaned of all debris which could enter the regulators or the
burner system and cause malfunctions or unsafe conditions. Pipe connection compounds must be
used AT ALL TIMES. DO NOT use Teflon tape as a thread sealant.
1. The gas supply line must be sized, considering pressure drop, to furnish gas at a pressure
necessary for the burner to develop rated capacity and the CFH to handle all fuel burning
equipment attached to the line. A drip leg should be installed ahead of the burner piping
connection. See burner manufacturer's manual for piping detail.
2. Piping or tubing from regulator vents shall be routed outside the building and must be the
same diameter as the regulator venting ports. Provide no traps in the vent lines and terminate
away from all doors, windows and air intakes serving HVAC equipment. Vent termination
shall face downward with a screen mesh cover to prevent insects and debris from entering. If
regulator vents are combined, use tubing or pipe equal to the total cross sectional area of the
individual vents. Normally open vent valves must be separately vented.
NOTE: High and low gas pressure switches must be vented separately from those of the main and
pilot regulators. Termination of vents shall be the same as for regulators.
3. Before gas is turned on, be sure the gas line has been checked for leaks. Check to see that
there are no open fittings and that the burner main manual valve and pilot manual valve are
closed.
OIL TANK AND PIPING
1. Tank construction and installation must meet all local codes and should meet the
specifications recommended by Underwriters Laboratories.
2. REFER TO YOUR BURNER STARTUP MANUAL FOR OIL PUMPING AND
PIPING DETAILS.