it becomes necessary to move the leaf with an outside force. The hand
release shall be an automatic reset type so that the brake will be operable
during subsequent electrical operation of the door.
2.3.4
Controls
Doors shall be controlled by constant pressure push buttons mounted on the
door leaves. Removing pressure from the button shall stop the movement of
the leaves. The control equipment shall conform to NEMA ICS 1 and NEMA ICS
2. Interior push buttons shall be mushroom head type, mounted in
heavy-duty, oil-tight enclosures conforming to NEMA ICS 6, Type 13, except
that enclosure for reversing starter with disconnect switch shall be Type 1
or Type 12. [Exterior push buttons shall be in watertight enclosures
conforming to NEMA ICS 6, Type 4.]
2.3.4.1
Push Buttons for Individually Operated Doors
The leaves mounted on the outer rails shall have the push buttons mounted
on the exterior face; the leaves on the inner rails shall have the buttons
mounted on the interior face; and the leaves on the middle rails shall have
the buttons mounted on both the exterior and interior faces. The button at
each edge of a leaf shall allow the leaf to travel with that edge as the
leading edge only. The controls shall not be reversible. Location of each
control button shall be as indicated.
2.3.4.2
Push Buttons for Floating Group Doors
Each group shall be controlled by push button stations mounted at each end
of each group of leaves. Stations shall contain one button for stacking
the leaves, one button for unstacking the leaves, and a third button for
moving the leaves in a group. The leaves mounted on the outer rail shall
have the push buttons mounted on the exterior face. The leaves mounted on
the inner rail shall have the push buttons mounted on the interior face.
Location of each control station shall be shown on manufacturer's drawings.
2.3.4.3
Push Buttons for Anchored Group Doors
Each group shall be controlled by a two-button push button station marked
"OPEN" and "CLOSE" mounted near the inside leading edge of the lead leaf.
2.3.5
Limit Switches
Provide limit switches to prevent overtravel and bumping.
Safety edges
shall not be used as limit switches.
2.3.5.1
Plunger-Type Limit Switches
Provide [at each edge of each leaf of individually operated doors] [at each
end of each group of floating group doors]. Limit switches shall be
actuated by 20 mm 3/4 inch diameter stainless steel rods of adjustable
length, guided at both ends with nonmetallic bearings and with tape-type
constant force springs to return the rods to their normal position after
actuation. The actuating rods shall have sufficient overtravel so that the
leaves cannot bump one another or any portion of the building or be damaged
when being towed. Each rod shall be adjustable 6 inches plus or minus from
its normal position.
SECTION 08342
Page 17
Previous Page
