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John Wood SERIES 100 User Manual

Page 12

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12

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 14a & b.

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 14a. (A)JWSH100199 & (A)JWSH100250 Models Only

FIGURE 14b. (A)JWSH100150 Models Only

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.

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