13
WARNING
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER THAN
10.5" (2.59 KPa) WATER COLUMN SUPPLY GAS PRESSURE. HIGHER
GAS SUPPLY PRESSURES REQUIRE SUPPLEMENTAL REDUCING
SERVICE REGULATION. EXPOSURE TO HIGHER GAS SUPPLY
PRESSURE MAY CAUSE DAMAGE TO THE GAS CONTROLS WHICH
COULD RESULT IN FIRE OR EXPLOSION. IF OVERPRESSURE HAS
OCCURRED SUCH AS THROUGH IMPROPER TESTING OF GAS
LINES OR EMERGENCY MALFUNCTION OF THE SUPPLY SYSTEM
THE GAS VALVE MUST BE CHECKED FOR SAFE OPERATION. MAKE
SURE THAT THE OUTSIDE VENTS ON THE SUPPLY REGULATORS
AND THE SAFETY VENT VALVES ARE PROTECTED AGAINST
BLOCKAGE. THESE ARE PARTS OF THE GAS SUPPLY SYSTEM,
NOT THE HEATER. VENT BLOCKAGE MAY OCCUR DURING ICE
STORMS.
IT IS IMPORTANT TO GUARD AGAINST GAS VALVE FOULING FROM
CONTAMINANTS IN THE GAS WAYS. SUCH FOULING MAY CAUSE
IMPROPER OPERATION, FIRE OR EXPLOSION.
IF COPPER SUPPLY LINES ARE USED THEY MUST BE INTERNALLY
TINNED AND CERTIFIED FOR GAS SERVICE.
BEFORE ATTACHING THE GAS LINE BE SURE THAT ALL GAS PIPE IS
CLEAN ON THE INSIDE.
TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS SUPPLY
LINE, A DIRT LEG (SOMETIMES CALLED A SEDIMENT TRAP OR DRIP
LEG) MUST BE INCORPORATED IN THE PIPING (SEE FIGURE 13).
THE DIRT LEG MUST BE READILY ACCESSIBLE AND NOT SUBJECT
TO FREEZING CONDITIONS. INSTALL IN ACCORDANCE WITH
RECOMMENDATIONS OF SERVING GAS SUPPLIERS. REFER TO THE
NATIONAL FUEL GAS CODE.
FIGURE 13.
CONNECTION OF GAS PIPE
1. When connecting gas pipe to unit, apply wrench to flange only. Note:
Do not use wrench on gas valve or gas bracket. See Figure 14.
2. PERFORM THE GAS LEAK TEST ANY TIME WORK IS DONE ON A GAS
SYSTEM TO AVOID THE POSSIBILITY OF FIRE OR EXPLOSION WITH
PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE.
FIGURE 14.
The Gas Leak Test is performed as follows: Paint pipe connections upstream
of gas control with a rich soap and water solution to test for leaks before
operating main burner. Bubbles indicate gas leak. To stop leak, tighten pipe
connections. After piping connections are checked, turn on main burner. With
main burner in operation, paint pipe joints (including flanges), pilot gas tubing
connections and control inlet and outlet with rich soap and water solution.
Bubbles indicate gas leak. To stop leak, tighten flange screws, joints and
pipe connections. Replace part if leak can’t be stopped.
To prevent damage, care must be taken not to apply too much torque when
attaching gas supply pipe to gas valve inlet.
Apply joint compounds (pipe dope) sparingly and only to the male threads of
pipe joints. Do not apply compound to the first two threads. Use compounds
resistant to the action of liquefied petroleum gases.
