Model RT-150 Installation, Operation & Maintenance
Instructions
Roto-Twist
®
cable actuated damper drive system.
Please read completely before installing this equipment.
Receipt Inspection
Check material received against packing list. Claims resulting from factory errors must
be made within 2 weeks after receipt of goods.
Installation
(Reference illustrations on next page)
1. Round dampers are furnished as one piece; however, make sure cable end is secure
in damper pivot coupling prior to installing.
2. Secure damper in position in duct. Screw or rivet into the U shaped bearing bracket
from outside the duct - minimum of 1 screw per side. Preferred installation method
is via #10 speed screws. Do not rack or distort damper. Dampers are ¼” undersized
from nominal dimensions. Position damper to allow best cable run, avoiding tight
turns, while keeping adjustment end in its preferred accessible position. Keep
adjustment end of cable within 5” of accessible opening if possible. Alternately cables
may be left hanging out of ceiling upon installation of air outlet and slipped back in
after balancing.
3. Secure the adjustment end of the cable using the nylon clamp. The clamp may be
positioned anywhere along cable length to keep adjustment end in accessible
position. Do not over tighten. Cable should rotate easily inside the clamp.
Operation
Dampers may be adjusted by using a MAT Square Nut driver or a ¼” hex nut driver to
the male square adjustment end of the cable. Once set, dampers will hold their settings
through the design velocity limits. MAT Square Nut Drivers with 5” shaft length may be
purchased from the manufacturer. Optional screwdriver tip units are adjusted with a thin
bladed screwdriver.
Maintenance
Properly installed Roto-Twist® dampers require no maintenance of any kind.
Toll free: 800.585.7686 +1.708.552.4040 | Chicago, IL USA www.metairtech.com
© 2017 Metropolitan Air Technology. All rights reserved. 4/17
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