4. Installation of multiple units on a pad or rooftop where the top clearance is open.
A) Refer to minimum clearance table in the lower corner of this page for required clearances
B) National Electric Code requires 3 feet minimum (4 feet if certain conditions are present) clearance
between service access panel and adjacent unit. If service access panel faces the wall, the required
space between the wall and the unit shall be minimum 3 feet. (May require as much as 3 1/2 feet)
C) Walls / Fence height shall not be higher than top of units.
D) National, State, and Local Codes must be observed.
E) If design outdoor dry bulb exceeds 105F (40.6C) add 1.0 Ft. to all dimensions.
A
min**
A
min**
A
min**
A
min**
A
min**
A
min**
2 B
m i n
2 B
m i n
2 B
m i n
2 B
m i n
2 B
m i n
2 B
m i n
-3.0’-
min
-3.0’-
min
-3.0’-
min
-3.0’-
min
-3.0’-
min
-3.0’-
min
Service Access *
Service Access *
Service Access *
Service Access *
Service Access *
Service Access *
Service Access *
Service Access *
Service Access *
* Units may be rotated in order that service access sides face each other provided
that 3 feet minimum clearance be maintained between the units. In order to
comply with NEC, this may increase to 4 feet minimum clearance.
** If wall or fence is to be constructed around the entire perimeter of the
mechanical yard, Maintain minimum 1.5 feet clearance from the units. The fence
height shall not exceed that of the unit. It is recommended to install louvers in
the fence to allow no greater than 300 feet per minute velocity. Consult the table
on page 18 for unit airflow. Place louvers in the lower section of the fence by
each unit in order to provide air access to each unit located by the fence. The
lower portion of the fence may also be cut in order to equal the calculated free
area.
Pg. 13
e
z
i
S
e
s
a
B
A
B
e
c
i
v
r
e
S
e
c
n
a
r
a
e
l
C
2
'
0
.
1
'
0
.
1
"
6
3
3
'
2
.
1
'
2
.
1
"
6
3
4
'
5
.
1
'
4
.
1
"
6
3
minimum clearance table
The measurement 2B
indicates to multiply
the dimension B from
the minimum clear-
ance table by 2 in or-
der to determine the
approprieate minimum
distance between units.
