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46
GAS-FIRED HEATER Installation Manual
Contender. It is very important that the gas line
is properly purged by the gas supplier or utility.
Failure to properly purge the lines or improper
line sizing, will result in ignition failure. This
problem is especially noticeable in NEW LP
installations and also in empty tank situations.
This can also occur when a utility company shuts
off 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.
PART 8: GAS PIPING
(CONTINUED)
D. DUNGS GAS VALVE
OFF SET ADJUSTMENT
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
SETTINGS. SEE PART 12 SECTION "D"
GAS SHUT OFF
VALVE
PRESSURE
TAP INLET
GAS VALVE
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.
Fig. 8-3
WARNING
For a heater already installed,
you must turn off gas supply,
turn off power and allow
heater to cool before
proceeding. You must also
completely test the heater
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 heater 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!