Sterling RT - Manual (Page 2)

FIGURE 2 - ROOF OPENING SPECIFICATIONS
Roof Curb kits ship knocked down for ease of han-
dling and storage. The field assembly and mounting of
the curb to the roof is the responsibility of the installer.
All kits ship complete with pre-assembled side and
end rails, cross member supports, hardware, insula-
tion and gasketing. See Figure 3 for a complete parts
list for your kit. Check to see that all components of
the kit are included. Refer to Figures 3, 4, 5 & 6 to
see if all other field supplied parts are also on hand.
Provide a suitable opening, or two openings, in the
roof as suggested per Figures 2 & 4. These return
and/or supply air openings have been calculated to
include a one inch clearance on each side of the duct-
work. The installer may determine his/her own open-
ing(s) to accept return and/or supply air ducts to suit
his/her particular needs.
All curbs must be mounted on level areas. The
roof must be suitable to support the weight of both the
curb and the unit to be mounted. The enclosed area
of the roof curb must comply to required clearances to
combustible materials. If the roof construction is
made of combustible materials, the enclosed roof curb
area must meet the following requirements:
(1) Ventilate this area;
(2) Leave area open (however, this may elevate
higher sound levels);
(3) Cover this area with non-combustible material,
which utilizes an “R” value of 5.0 minimum.
Position and assemble the curb, referring to
Figures 1 thru 6, and the following procedure:
(1) All hardware used for these assembly proce-
dures is included with your kit, and should be
used. Do not tighten any hardware until
the curb is completely level and square,
and installed in a suitable position on the
roof, with proper alignment to the roof/unit
opening(s).
(2) Position and install the end and side curb rail
sub-assemblies, aligning around the roof open-
ing location(s).
(3) Position and install the inner cross brace(s) as
shown.
(4) Secure the roof curb to the roof decking.
(5) Install the field supplied flashing/ materials.
(6) Apply the gasketing (included with the kit) on
the top flanges/surfaces of the curb as shown.
20-7/8"
(530)
20-7/8"
(530)
A *
Return
Air
Opening
Supply
Air
Opening
E *
Section
Y-Y
Section
X-X
Capacity
[ CA ]
Dimension
E *
10/15
20/25/50
30/35/60/70
40/80/12
26"
(660)
37"
(940)
48"
(1219)
53-1/2"
(1359)
Unit Type [ UT ] “RT, PV or AH”
* All Dimensions Shown Have Been Calculated To
Include A One (1) Inch Clearance Around Return
And Supply Ducts.
CURB SPECIFICATIONS
* ROOF OPENINGS
D3809-4
* Dimension “A” applies to the distance between roof openings (only on units with a supply plenum; also refer to Figure 4):
“A” = 50 -7/8 inches.
This “A” dimension applies only to roof curb kits RC003 and RC004.
Refer to Figure 4 for section X-X and Y-Y details.
Dimensions are in inches (Dimensions in parenthesis are in millimeters).
2
WARNING
To avoid any property damage or personal injury,
it is the installer’s responsibility to make sure that
the installation will not impair the function of this
curb, or the unit to be installed.
WARNING
To avoid any property damage or personal injury,
it is the installer’s responsibility that the roof curb
and unit must be completely sealed, preventing
any water or air leakage/damage.