Allmand Brothers MH1000 IDF - Manual (Page 9)

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MAXI-HEAT ® SETUP PROCEDURE
The Frost Fighter heater units need to be set up for each operation and tuned to operate efficiently
depending on the altitude of intended use. As you go up in elevation, the air gets thinner. As the air
gets thinner the ability to burn or consume a certain amount of fuel is diminished. When you move the
machine to a different elevation you may need to change the nozzle size and air settings to get a clean
efficient burn. The nozzle size is determined by the number of gallons per hour number (GPH). A number
is stamped on the nozzle indicating the amount of fuel that the nozzle will deliver to the burning chamber.
For higher elevations, selecting a nozzle that delivers less fuel allows you to make the air mixture adjust-
ments needed to burn all of the fuel with less air (thinner air).
Test Equipment:
Bacharach Oil Burner Smoke Tester – is used to determine the amount of soot in the exhaust gasses.
This can indicate the level of combustion being achieved. It is recommended that the Smoke Tester be
used for tuning the Maxi Heat Frost Fighters.
Instructions for setting up the Maxi Heat at elevations above sea level.
1. Install fuel pressure gages (if not equipped).
2. Set Fuel Pressure to 140 PSI
3. Head Setting at #6.
4. Shutter Setting – Full open. #10 Setting.
· Fine adjustment – very little change in air mixture results when changing the settings from 1 to
10.
5. Band Setting - ½ open. — #5 Setting
· Starting at 50% open allows adjustment in both directions during tuning.
6. Install nozzle size that gives a medium to good burn (2 or 3) on True-Spot Smoke Tester
· While the fuel pressure is maintained at 140 PSI, Head Setting at #6, and Shutter and Band Set-
tings are at the #10 and #5 settings, test nozzles until you have a nozzle that gives satisfactory
initial smoke tester readings.
· Example:
1. Initial startup with settings as noted above ( Fuel 140 PSI, Shutter #10, Band #5) gives a
smoke reading between 6 & 9 (heavy smoke on test strip with visible smoke coming from the
stack and possibly a rumbling sound coming from the burner.
2. Smoke indicates too much fuel or not enough air. (fuel not being totally burned)
Action:
1. Turn off switch and let the Frost Fighter cool down.
2. Shut off the power to the Frost Fighter.
3. Remove Fuel Rail, and determine the nozzle rating in GPH (gallons per hour) e.g. 3.
4. Select a nozzle that has an output lower than 3. (Read the following suggestions for selecting a
nozzle size and depending on the initial startup and smoke test readings you can make an informed
decision on which nozzle to select.
·
For heavy smoke and a rumbling sound you may select a 2.5 GPH nozzle for the next test.
· For heavy smoke and no rumbling, you may want to select a 2.75 GPH nozzle for the next test.
5. Install nozzle,