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· Service your barns to cure easy, nice
tobacco with low fuel consumption.
- Make sure your barn has good grounding. Consult your electrician
and if necessary, replace old inefficient grounding with new,
according to local regulations. Absence of correct ground
is unsafe and will cause burner misfiring.
- Check that you have appropriate electrical supply to your
barns - size of main fuses, switches, and wiring.
- Prevent air losses to your barns. Service your barn structure.
Fix all loose sheets or plywood pieces at roof and barn's
sides. Close all gaps with appropriate acrylic sealer, silicone
or foam. Paint foam after it matures. Paint any exposed and
damaged polyurethane foam in order to avoid small particles
getting on the tobacco.
Gaps in curing room and machine room's upper and lower plenums
will result in air leaks which will make Colouring difficult,
may delay curing time, and will increase fuel consumption.
- Prevent heat losses from your barn's structure. Check that
barn's roof and insulation are in good condition & that
the back sides of the barn (mainly at the upper and lower
plenum) exposed to the outside conditions are insulated. If
not, add appropriate insulation and cover with plywood or
metal sheet to decrease heat losses to the atmosphere. Do
not use exposed glassfibre mattress if it is not well protected
with metal sheet or plywood.
Note : Heat losses will delay your cure and will increase
fuel consumption.
- Service your air exhaust dampers so they can move freely.
- Service your boxes or racks so that when placed in the barn,
they touch each other without leaving gaps. Note : Gaps of
1/3" between boxes may delay curing by one day, will
increase fuel consumption by 30% and may cure tobacco of lower
grade.
- Service your curing room's side rubber gaskets. Check that
when racks or boxes are in the barn, there are no gaps to
the side walls, or to the front doors, which will cause the
air to bypass tobacco mass.
- Prepare foam stripes (indicatively 8" x 8" x 9')
for closing the remaining gap between the boxes and front
doors when curing so you can force the air to pass through
the tobacco mass. The foam stripes can be made from mattress
material wrapped with a cloth to prevent aging and transfer
of small particles to the tobacco.
CAUTION : Do not use glassfibre insulation, or old
aged mattress material, since air stream will transfer small
undesired synthetic particles on the tobacco.
- Service your water jets for conditioning. Check that your
jets are well positioned, not spraying water on fan motor.
Before starting your VCU check if:
· You have appropriate electrical supply to fan
· You have 115 Volts + Neutral + Ground to Burner.
· You have connected to burner's line (phase) the
air pressure safety switch & the high temp. safety switch
· Burner's line is interlocked with fan's motor Relay
so that burner is not permitted to fire unless motor is operating
Never attempt to run VCU without Air pressure safety switch
& Burner's line interlocked to fan's motor relay
Make sure you have installed on the Gas Line.
· Appropriate Gas Filter
· Gas pressure regulator
-LPG: Delivery 25 pounds per hour, outlet press. ~8-12"
(0,45 PSI) (30 mbar)
-Nat. gas: Delivery 9 CFM, outlet press. ~8-12"
(0,45 PSI) (30 mbar)
· Gas pressure stabilizer, when firing Natural Gas
(if you have experienced serious pressure fluctuations)
· Antivibration Flexible joint is recommended
· CAUTION : Follow your local regulations, call
a qualified technician and follow burner's manual before making
connections & adjustments.
· Take all necessary safety precautions when installing
and running your VCU.
· Gas may be explosive under certain conditions
· Check at intervals for leakages in pipework and connections
according to appropriate standards.
· Check for correct connection and operation of all
External Components.
· Ground properly your Barn, Electrical panel, and
Burner
· Check for correct ground each season.
When starting your VCU
· Check for correct fan rotation
· Keep all side panels in place when operating. Do
not open side panels if fan is still rotating
· Do not open side panels until VCU disconnect is in
OFF position.
A few words on Curing with VCU®
Curing technique with VCU® is practically the
same as with the Direct Fired Units so the same Curing schedule
can be followed.
VCU® supplies the barn with large amounts of dry
air.
You may notice that you can cure your tobacco with
smaller intake damper opening than what you are used to, since
Direct Gas Firing produces also water vapors in the
barn, so greater ventilation is required to drive out of the
barn those extra vapors. Since greater ventilation is required,
more btus are also required to cure the same tobacco in the
same time margin.
Indirect Gas Firing drives all combustion fumes (vapors
too) outside the barn so smaller ventilation is required to
cure the same tobacco in the same time margin. Above fact,
VCU's high efficiency and Ventobacco recommendations
will help you get nice cures with the lowest possible
fuel consumption.
VCU®(2K)is the most efficient and time proven
Indirect Fired Curing Unit all around the world designed
to exhaust combustion gases outside the barn with maximum
efficiency, trouble free long lasting operation and the lowest
possible fuel consumption.
VCU's large Heat Exchanger all built in high quality
Stainless Steel is designed to exceed 90% net efficiency
combined with VV's pressure burner.
With proper management your VCU's® fuel consumption
during curing will be the same or lower than Direct Fired
Furnace's consumption.
You may also notice that your VCU's pressure
burner is firing for longer with less stops (longer operating
cycles) than your atmospheric burner.
This is because it is adjusted at lower Btus per hour output
compared to the atmospheric burner.
So instead of firing lots of Btus (more than necessary) for
short time then stop for a while (since the fired Btus are
more than necessary) and keep repeating many cycles per hour,
VCU's burner is designed to fire less Btus but for
longer time, repeating less cycles per hour.
Follow the Ventobacco recommendations to perfectly match
your VCU's® operation to your barn and save
fuel taking advantage of VCU's efficiency.
[Intro]
[Facts] [VCU model 2K]
[Efficiency-emmisions ]
[Installation Recomendation]
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