3-20
a. Ensure that there is little or no air movement or
vibration in the room.
b. Turn off all fans and air conditioning if possible. If
you cannot turn them off, position the furnace so
that no air is blowing in its direction.
NOTE
The scale is very sensitive. Simply walking past the
unit can cause enough movement to affect a
measurement.
4. With the door open and only the hearth plate in the unit,
press <TARE>.
5. Set a timer for one minute and monitor the mass on the
control panel display.
If the scale drifts to any point less than or greater
than 0.0, go back to step 2.
Otherwise, go to step 6.
6. When the unit is stable, close the door and move its
handle to partially engage it (about forty-five degrees).
NOTE
Do not move the door handle to the point where the
solenoid interlock is engaged, or the unit will heat up.
The unit’s temperature must be less than 30°C to
perform this procedure.
7. Set the timer for four minutes.
8. After four minutes, record the airflow lift. (The ideal
range is between -2.5 and -3.5 grams.)
9. Open the door and set the timer for four minutes.
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