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113247-3 www.amdry.com 17
Fresh Air Supply Requirements _______
When the dryer is operating, it draws in room air, heats it,
passes this air through the tumbler, and exhausts it out of the
building. Therefore, the room air must be continually
replenished from the outdoors. If the make-up air is
inadequate, drying time and drying efficiency will be adversely
affected. Ignition problems and sail switch “fluttering”
problems may result, as well as premature motor failure from
overheating. The dryer must be installed with provisions for
adequate combustion and make-up air supply.
Air supply (make-up air) must be given careful consideration
to ensure proper performance of each dryer. As a general
rule, an unrestricted air entrance from the outdoors
(atmosphere) of a minimum of 1-1/2 square feet (0.14 square
meters) ADH-75; 3 square feet (0.28 square meters)
ADH-120; 4 square feet (0.37 square meters) ADH-170; is
required for each dryer.
ADH-75 A = 2 ft (0.61 m) B = 18” (45.72 cm)
ADH-120 A = 2 ft (0.61 m) B = 3 ft (0.91 m)
ADH-170 A = 3 ft (0.91 m) B = 3 ft (0.91 m)
To compensate for the use of registers or louvers used over
the openings, this area must be increased by approximately
thirty-three percent (33%). Make-up air openings should not
be located in an area directly near where exhaust vents exit
the building.
It is not necessary to have a separate make-up air opening
for each dryer. Common make-up air openings are
acceptable. However, they must be set up in such a manner
that the make-up air is distributed equally to all the dryers.
ADH-120 EXAMPLE: For a bank of 4 dryers, 2 unrestricted
openings measuring 2 feet by 3 feet (0.61 meters by 0.91
meters) are acceptable.
Allowances must be made for remote or constricting
passageways or where dryers are located at excessive
altitudes or predominantly low pressure areas.
Important
Make-up air must be provided from a source free
of dry cleaning solvent fumes. Make-up air that is
contaminated by dry cleaning solvent fumes will result in
irreparable damage to the motors and other dryer
components.
Note
Component failure due to dry cleaning solvent
fumes will void the warranty.
Dryer Enclosure Requirements _______
Bulkheads and partitions should be made of noncombustible
material.
Note
Allowances must be made for opening the control
door.
A The optimum opening of load door is 30-inches (76.2
cm) for ADH-75; and 38-1/4” (76.2 cm) for ADH-120 and
ADH-170.
B The maximum thickness of the bulkhead is 4-inches
(10.16 cm). For electric dryers the maximum thickness
of the bulkhead is 1-inch (2.54 cm) within 3-inches (7.62
cm) from the top of the control door.
C For electric dryers a minimum overhead clearance of
12-inches (30.48 cm) is required, providing no sprinkler
is located above the dryer. For steam dryers or if a
sprinkler is located above the dryer, 18-inches (45.72
cm) is required.
D Dryer should be positioned 12-inches (30.48 cm) for
ADH-75; 24-inches (60.96 cm) for ADH-120 and
ADH-170, away from the nearest obstruction and
24-inches (60.96 cm) for ADH-75; 36-inches (91.44 cm)
for ADH-120 and ADH-170 is recommended for ease of
installation, maintenance, and service.
E Flush to the opening of the control door.
F Flooring should be level or below dryer cabinet for ease
of removing panels during maintenance.
G Dryers may be positioned sidewall to sidewall, however
a 1/16” (1.5875 mm) minimum allowance must be made
for the opening and closing of the control door, along
with the removal of panels during maintenance.
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