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Draft Test Procedure
After the venting is completed, the rebox draft will need
to be checked and possibly adjusted. After removing the
plug bolt from the draft hole (3/16” hex key wrench)
shown in Fig. 9, insert the draft meter tube. The hopper
lid must be latched during this test. (It is recommended
that the draft meter have a scale of 0 to 1” WC.)
Turn the feed adjuster to “Test”. this will start the
combustion blower and allow you to check and record
the High Draft ______ - IWC date _______ The
maximum draft allowed is -.9” Water Column (-224 Pa).
There is no adjustment for the High Draft, other than
re-positioning the combustion blower fan blade on its
shaft, or a change in the venting conguration.
After the rst 60 seconds the “Test” mode lowers the
combustion blower voltage to the Low Burn voltage.
During this lowered voltage cycle, the Low Draft must
be checked and adjusted if necessary. The recommended
low draft setting should be between -.45 and -.55 IWC.
Depending on the amount of vertical rise, it may not be
possible to get a low draft reading in this range. In this
case, re-positioning the fan blade further on the motor
shaft may be helpful.
There is a low draft voltage adjustment screw located
through the small hole to the right of the Igniter Light.
See Fig. 10. Adjusted Low Draft is __________ -IWC.
To increase the draft in higher altitudes, kit #
1-00-232059 High Altitude Intake Reduction, may be
needed.
Don’t forget to turn the feed adjuster off of “Test”, and
reinstall the draft test plug bolt into the boiler.
“Test”
Low Draft
Adjustment Pot
Fig. 10
Fig. 9
Draft
Testing Port
1.) REMOVE FIRE TUBE CLEANOUT DOOR
3.) REMOVE COMBUSTION BLOWER
2.) REMOVE COMBUSTION BLOWER COVER
4.) INSERT HIGH ALTITUDE RING ( P.N. 1-00-232059 )
THRU OPENING WHERE COMBUSTION BLOWER WAS INSTALLED
STUDS GO THRU HOLES ON BACK FACE OF HOUSING
NOTE: SOME EARLY MODELS HAVE HOLES THAT ARE TOO
SMALL AND NEED TO BE DRILLED TO 3/16"
5.) INSTALL (3) 8-32 NUT ( P.N. 3-30-8008321 )
AND TIGHTEN USING EITHER AN 11/32"
WRENCH OR A DEEP WELL SOCKET
High altitude kit #1-00-232059.
Install this ring to increase draft in higher altitude
installation locations.
CAUTION: Hot While In Operation. Do
Not Touch. Keep Children, Clothing And
Furniture Away. Contact May Cause Skin
Burns. See Nameplate And Instructions.
WARNING: Keep Doors Closed During
Operation.
WARNING: Do Not Store Fuel or Other
Combustible Material Within Installation
Clearance Area.
WARNING: Risk of Fire - Do Not Operate
With the Flue Draft Exceeding -.9” Water
Column (-224 Pa).