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Figure 22: Welding Of Hold Down Brackets—Unit Base, Cross-Sectional View
.25
Weld
.50"
zone
Figure 23: Shim Spacers On Hold Down Brackets
Shim
spacer
McQuay IM 987
Acceptable weld zone
Unit power wiring
(by factory)
It may be necessary for
the contractor to field
fabricate spacers or new
seismic hold-downs for
rooftop units having larger
overhang dimensions.
Seismic hold
down bracket
Mechanical Installation
Unit power wiring
(by factory)
Unit base
Field attachment
weld
High temp
Insulation
Seismic hold down bracket
Unit control wiring
(by factory)
Unit base
Unit control wiring
(by factory)
Roof curb
Roof curb
21
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