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- Be familiar with the mechanical system you’re cleaning.
- Internal
components, type of material, installation and age of ducting,
all can affect your ability to clean the ductwork safely.
- Cut an opening in the supply side of the HVAC system near the furnace
to connect the flexible ducting from the negative air collection
unit .
- Block all registers,(supply and return) except the most remote supply
register, this will be the starting point for the scouring process.
- With
the HVAC unit,(furnace) off, activate the negative air collection
unit.
- After
attaching the proper auger to the drive cable and drive unit, (see
manual) insert auger into duct through the register left open
in the
supply system. The airflow from the negative collection unit
will pull debris scoured from this point back to collection bin.
- With power connected and main power switch (located on drive unit)
off, adjust the speed dial to 0.
- Turn main power switch to “on” position
- Turn rocker switch
on belt unit to forward, slowly adjust speed dial to increase speed
of turning auger inside the duct. The auger will rise
up and center itself inside the duct, evident by watching the drive
cable if the auger itself is not visible. If the auger seems to buck
or bounce
up and down reduce the speed slightly until it holds position in
the center of the duct. Note the position of the speed dial, as this
is the
proper speed for the diameter of this branch and you’re likely
to use this setting for other branches of the same size.
- Feed the cable/auger
down the duct scouring this branch and the portion of trunk/main
accessible from this location. A noticeable change in the
sound of the auger usually indicates that you have entered the
trunk/main.
- Rectangular
trunk lines may be cleaned by entering in forward or clockwise
mode, cleaning the right side of the duct, then reversing the rotation
allowing the auger to track to the left and pulling the auger
back
while cleaning the left side of the duct. Always be sure to use
the lock nut
when reversing the rotation of the auger.
- Open the next register and block the one that is now clean. Continue
in this manner until all of the supply system is clean.
- To clean the return system make another opening in the system on
the return side near the furnace. Close the opening on the supply side.
Repeat
the scouring process for the return system.
- It is necessary to block all of the registers except the one being
scoured, (supply and return), while running the auger to maintain maximum
airflow/velocity
in the branch being scoured and prevent debris from being pulled
into and through the furnace.
- It is possible to isolate the furnace by pulling air from both the
supply and return systems simultaneously in which case blocking the
registers would not be as critical. This method requires an adapter
or “pants” to
split the airflow from the negative air collection unit and allow two
hoses to be connected to the HVAC system.
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