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GAS-FIRED BOILER Boiler Manual
PART 8: GAS PIPING
(CONTINUED)
D. DUNGS GAS VALVE FOR T50/T80/80M/140M/199M
OFF SET ADJUSTMENT
CAUTION: DO NOT REMOVE
THIS SCREW OR ATTEMPT TO
MAKE ANY ADJUSTMENT TO
THIS SCREW WITHOUT A
COMBUSTION ANALYZER
SEE PART 12 SECTION "D"
FOR COMBUSTION SETTING
TABLE.
PRESSURE TAP OUTLET
THROTTLE ADJUSTER
NOTE: IF FOR ANY REASON THE
THROTTLE NEEDS TO BE ADJUSTED,
IT IS VERY IMPORTANT THAT A
"COMBUSTION ANALYZER" BE USED
TO ENSURE SAFE AND PROPER
OPERATION. TURN THE ADJUSTER
TO THE (+) TO INCREASE GAS OR
THE (-) TO DECREASE THE GAS
SUPPLY. THIS ADJUSTMENT COULD
AFFECT CO/CO% LEVELS. MAKE
SURE THE LEVELS CORRESPOND
TO THE CHART IN COMBUSTION
GAS SHUT OFF
VALVE
PRESSURE
TAP INLET
GAS VALVE
SETTINGS. SEE PART 12 FIGURE 12-1
Fig. 8-2
service to an area to provide maintenance to their
lines. This gas valve must not be replaced with a
conventional gas valve under any circumstances.
As an additional safety feature, this gas valve has
a flanged connection to the swirl plate and blower.
WARNING
For gas conversions for a boiler already installed, you must turn off gas supply, turn off power and allow
boiler to cool before proceeding. You must also completely test the boiler after conversion to verify
performance as described under “Startup” section of this manual. See separate natural to propane
conversion instructions for conversion of an existing boiler available from Heat Transfer Products. Failure
to comply with the proper gas conversion instructions could result in severe personal injury, death or
substantial property damage. Failure to follow all precautions could result in fire, explosion or death!