American Dryer Corp. Phase 7 / OPL ensor Activated Fire Extinguishing System D120 - Manual (Page 16)

16 JLA Limited 113375 - 6
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Diagram 1 shows the damper in the heating (open) mode,
allowing heat into the tumbler.
Diagram 2 shows the damper in the cool down (closed)
mode, pulling ambient air directly into the tumbler without
passing through the coils.
Note
With the dryer off or with no air supply, the steam
damper is in cool down mode as shown in
Diagram 2.
Steam Damper Air Piston (Flow Control)
Operation Adjustment
Although the steam damper operation was tested and
adjusted prior to shipping at 80 psi (5.51 bar), steam damper
operation must be checked before the dryer is put into
operation. Refer to the following page to check steam
damper operation. If steam damper adjustment is necessary,
locate the flow control valve and make the necessary
adjustments as noted below.
Preparation for Operation/Start-Up __
The following items should be checked before attempting
to operate the dryer:
• Read all “CAUTION,” “WARNING,” and “DIRECTION”
labels attached to the dryer.
• Check incoming supply voltage to be sure that it is the
same as indicated on the dryer data label. In the case
of 208 VAC or 230/240 VAC, the supply voltage must
match the electric service exactly.
• GAS MODELS – check to assure that the dryer is
connected to the type of heat/gas indicated on the dryer
data label.
• GAS MODELS – the sail switch damper assembly was
installed and pre-adjusted at the factory prior to shipping.
However, each sail switch adjustment must be checked
to assure that this important safety control is functioning.
• GAS MODELS – be sure that all gas shutoff valves are
in the open position.
• Be sure that all electric box covers have been replaced.
• Check all service doors to assure that they are closed
and secured in place.
• Be sure the lint drawer is securely in place.
Note
Lint drawer must be closed to activate the safety
switch otherwise the dryer will not start.
• Rotate the tumbler (drum) by hand to be sure it moves
freely.
• Check bolts, nuts, screws, terminals, and fittings for
security.
• STEAM MODELS – check to ensure air supply (80 psi
[5.51 bar]) is connected to the dryer.
• STEAM MODELS – check to ensure all steam shutoff
valves are open.
• STEAM MODELS – check steam damper operation.
• Check tumbler bearing setscrews to ensure they are all
tight.
Preoperational Test __________________
All dryers are thoroughly tested and inspected before leaving
the factory. However, a preoperational test should be
performed before the dryer is publicly used. It is possible
that adjustments have changed in transit or due to marginal
location (installation) conditions.
Turn on electric power to the dryer.
Make sure the main door is closed and the lint drawer is
securely in place.
Refer to the Operating Instructions for starting your particular
model dryer.
Check to ensure that the tumbler starts in the clockwise
direction. Additionally, check the direction of the motorized
impellor to ensure that the motorized impellor rotates in the
clockwise direction as viewed from the front. If it is, the
phasing is correct. If the phasing is incorrect, reverse two
of the leads at L1, L2, or L3 of the power supply connections
made to the dryer.
Steam Damper System Operation
The steam damper, as shown in the illustration below
(Diagram 1), allows the coil to stay constantly charged
eliminating repeated expansion and contraction. When the
damper is opened, the air immediately passes through the
already hot coil, providing instant heat to start the drying
process. When the damper is closed, ambient air is drawn
directly into the tumbler, allowing a rapid cool down.