The Seven Steps
HVAC Units
Purpose
To secure HVAC units mounted on vibration isolators.
Caution
When anchoring to post-tensioned slab, locate and avoid reinforcing.
Recommendation
Install restraint brackets or seismic snubbers.
Supplies Required
- Angle—6″ x 6″ x 1/2″ x 4″
OR
Bent plate—3/8″ - Lag bolts—5/8″ diameter x 6″ (for wood)
- Expansion bolts—5/8″ diameter x 4″ (for concrete)
- Flex-line
- Steel Z snubbers (or other seismic type snubber)
- 4 x blocking (for wood construction)
- Framing clips (for wood construction)
Installation
Restrain Bracket Installation
- Provide two angles or bent plates at each corner of the unit.
- Bolt to support with one bolt per angle. (For wood use two lag bolts at 3″ spacing per angle.)
Seismic Snubber Installation
- Provide two snubbers at each corner of the unit.
- Bolt to support, providing sufficient free play to allow unit vibration under normal use.
Note
Provide Flex-line at piping (see Piping).