Plans ARROW MECHANICAL CONTRACTORS, INC.
10330 S.W. TUALATIN RD.
TUALATIN, OREGON 97062
PHONE: (503) 692 -1565
FAX: (503) 691 -1879
DESIGN OF HVAC BASE UNITS CONNECTION
TO MANUFACTURED ROOF CURB
DESIGN CRITERIA:
• SEISMIC USE GROUP: I OR II
• SEISMIC DESIGN CATEGORY: D,E, OR F
• HEAVIEST UNIT TOTAL WEIGHT: WP = 1600#
TOTAL LATERAL FORCE (USING ASCE 7 -02 9.6.1.3)
F _ 0.4 apSDs WPIP ( + 2 ?\
Fp RP(1.4) h,
ap =1.0
SDS =1.0 (max)
WP = 1600#
IP =1.0
RP= 2.5 CITY OF TIGA)
z = UNIT ATTACHMENT POINT IN STRUCTURE ABOVE BASE Approved .�.g,............ [ ��
h = ROOF HEIGHT ABOVE BASE Conditionally Approved.... [ J
See Letter to: Follow • [ ]
= 1.0 FOR ROOF TOP HVAC UNITS er.P. d
Permit Number. 4 6 40 t i... -4 0.4b
h (0.4)(1.0)(1.0)(1600)(1.0) By: - 1 �11�a. Dom' lM afis
Fp Fp = k1+ 2(1.0)) By:
2.5 (1.4) Approved plans
Fp = 549# shall be on job site.
CHECK, OFFICE COPY
Fp. = 0.3 SDS WP IP 1 4
FpMLN = (0.3) (1.0) (1600) (1.0 =343# < 549# OK
USE 549#
ARROW MECHANICAL CONTRACTORS, INC.
10330 S.W. TUALATIN RD.
TUALATIN, OREGON 97062
PHONE: (503) 692 -1565
FAX: (503) 691 -1879
OVERTURNING ON UNITS:
3.5'
1.5' MIN.
MIN.
Wp = 1600#
Fp = 549#
G.C.
2.0'
MAX.
L
• •
END VI EW HVAC UNIT
DIMENSION REQUIREMENTS
MOT = (Fp) (Vert. Dist. to Center of Gravity) _ (549)(2.0) =1098 FT -LB
MR = (Wp) (Reduction for Load Combination) (Least Horiz. Dist. to Center of Gravity) = (1600)(0.9X1.5) = 2160 FT - LB S
Mn >MOT TENSION AND UPLIFT CONNECTION NOT REQUIRED DESIGN FOR SHEAR ONLY.
.f (4) #10 SCREWS BASE UNIT (20 GA)
AT LOCATIONS SHOWN
A A
(4) #10 SCREWS
i i ■OLZ• y INACCESSIBLE 16 GA CURB
AREA, CONDENSER
COIL END
PLAN VIEW DETAIL A -A
SCREW DESIGN:
549
V (ACTUAL) = =137# / SCREW
4 SCREWS
V (ALLOWABLE )= 177# / SCREW IN 20 GA MATERIAL (REF : ER - 4943P)
177 # >137# OK
USE (4) #10 SCREWS
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