McQuay RoofPak RDS 800C - Page 15

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Lifting points
To determine the required lifting cable lengths and whether
four- or six-point lifting is required, use Tables 3 and 4 below
and Figure 8.
Referring to Figure 8, note that dimension A is the dis-
tance between the outer lifting points. The four outer rigging
cables must be equal to or longer than dimension A. Dimen-
sion B shows the minimum distance between the outer and
the inner lifting points for six-point lifting. This can be used to
roughly determine the required length of the middle cables
for six-point lifting. Dimension A can be determined by
subtracting dimensions X and Y from dimension Z (i.e., A =
Z – X – Y).
Where:
Z = Total unit length in inches (refer to certified drawings for
this dimension).
X = Outdoor/return air section length (refer to Table 3 for this
dimension).
If A
≤ 288" (7315 mm), 4-point lifting is sufficient.
If A
> 288" (7315 mm), 6-point lifting is required.
Table 3. “X” dimension (see Figure 8)
OUTDOOR/RETURN AIR
SECTION
800C 802C
100 O.A. 00
PLENUM 40" (1016 mm) 52" (1321 mm)
0-30% O.A. 40" (1016 mm) 52" (1321 mm)
0-100% ECONOMIZER 40" (1016 mm) 52" (1321 mm)
0-100% ECONOMIZER
WITH 15" RETURN FAN
62" (1575 mm) —
0-100% ECONOMIZER
WITH 30" RETURN FAN
52" (1321 mm) 52" (1321 mm)
0-100% ECONOMIZER
WITH 40" RETURN FAN
— 80" (2032 mm)
Y=0
Y=0
Figure 8. Unit type RDS
4 lifting points 6 lifting points
800C: B Min. = 62" (1575 mm)
802C: B Min. = 84" (2134 mm)
A
Z
X
B
A
Z
X
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