York 026-36345-002 - User Manual

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This Roof Curb is NRCA approved and is constructed of 14 gauge galvanized steel with a full perimeter 2" X 4"

wood nailer strip. The curb is shipped with the following parts.

026-36345-002 14" HIGH 026-36345-102 24" HIGH

A 1 Side Panel Right, 78 1/2 x 14 A 1 Side Panel Right, 78 1/2 x 24

B 1 Side Panel Left, 78 1/2 x 14 B 1 Side Panel Left, 78 1/2 x 24

C 1 Side Panel Right, 78 1/2 x 14 C 1 Side Panel Right, 78 1/2 x 24

D 1 Side Panel Left, 78 1/2 x 14 D 1 Side Panel Left, 78 1/2 x 24

E 8 Side Panels, 71.75 x 14 E 8 Side Panels, 71.75 x 24

F 3 End Panels, 83 x 14 F 3 End Panels, 83 x 24

G 3 Brace Panels, 83 x 14 G 3 Brace Panels, 83 x 24

H 1 End Panel, 83 x 11 H 1 End Panel, 83 x 21

J 1 Supply Panel, 43 x 14 J 1 Supply Panel, 43 x 24

K 4 Support Rails, 83 x 3 K 4 Support Rails, 83 x 3

L 5 Condenser Panels L 5 Condenser Panels

M 10 Splice Channels M 10 Splice Channels

N 4 Condenser Panel Flashings N 4 Condenser Panel Flashings

P 1 Hardware Package P 1 Hardware Package

(100) .375-16 x 1.00 Hex Bolt w/ Nuts (168) .375-16 x 1.00 Hex Bolt w/ Nuts

(100) .375 Helical Lock washers (168) .375 Helical Lock washers

(100) .375 Flat Washers (168) .375 Flat Washers

(157) 25-14 x .75 Screw Tapping (157) 25-14 x .75 Screw Tapping

(Washer Head Seal Tight) (Washer Head Seal Tight)

(126 Ft) 3/4 x 1 1/4 Foam Gasket (126 Ft) 3/4 x 1 1/4 Foam Gasket

(100 Ft) 3/4 x 1/8 Tacky Tape (100 Ft) 3/4 x 1/8 Tacky Tape

PACKAGED ROOFTOP UNITS

INSTALLATION INSTRUCTIONS NEW RELEASE Form YRK2-N1 (319)

ROOF CURB

70–85 TON FULL PERIMETER

MODEL # 026-36345-002 / 026-36345-102

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This document describes the installation and features of a packaged rooftop unit roof curb, specifically designed for 70-85 TON full perimeter units. The models covered are 026-36345-002 (14" high) and 026-36345-102 (24" high).

Function Description

The roof curb serves as a foundational support structure for packaged rooftop units, ensuring proper mounting and integration with the building's roof. It is NRCA approved, indicating compliance with industry standards for roofing applications. The curb's design facilitates the secure placement of the HVAC unit, provides a sealed interface with the roof, and incorporates features for proper condensation drainage. The full perimeter design ensures robust support and stability for large tonnage units.

Important Technical Specifications

The roof curb is constructed from 14 gauge galvanized steel, providing durability and corrosion resistance suitable for outdoor environments. It includes a full perimeter 2" x 4" wood nailer strip, which is crucial for attaching roofing materials and ensuring a watertight seal.

Dimensions: The document provides detailed dimensions for various components, which are critical for ensuring a proper fit of the unit to the curb. All dimensions, unless otherwise specified, are measured from the "Flat Side" of the curb panels.

Return Opening: 48 x 83 inches.
Supply Opening: 43 x 71.61 inches.
Overall Curb Dimensions (approximate, based on component lengths):
- Length: Approximately 449 inches (including 87 and 83 inch sections, and other side panels).
- Width: Approximately 292 inches (including 48 and 67.125 inch sections, and other side panels).
Flange Width: 2 inches on the entire curb, contributing to the secure mounting and sealing.

Components List (for both 14" and 24" high models): The following components are shipped with the roof curb:

Side Panels:
- Side Panel Right: 2 pieces (78 1/2 x 14/24 inches each)
- Side Panel Left: 2 pieces (78 1/2 x 14/24 inches each)
- Side Panels (general): 8 pieces (71.75 x 14/24 inches each)
End Panels:
- End Panels: 3 pieces (83 x 14/24 inches each)
- End Panel (shorter): 1 piece (83 x 11/21 inches each)
Brace Panels: 3 pieces (83 x 14/24 inches each)
Supply Panel: 1 piece (43 x 14/24 inches each)
Support Rails (K): 4 pieces (83 x 3 inches each) – these are crucial for supporting condenser panels and ensuring proper drainage.
Condenser Panels (L): 5 pieces – these form the base of the condenser section and are designed to slope for drainage.
Splice Channels (M): 10 pieces – used to connect different sections of the curb.
Condenser Panel Flashings (N): 4 pieces – provide a weather-tight seal for the condenser section.
Hardware Package (P):
- Hex Bolts w/ Nuts (.375-16 x 1.00): 100 for 14" high model, 168 for 24" high model.
- Helical Lock Washers (.375): 100 for 14" high model, 168 for 24" high model.
- Flat Washers (.375): 100 for 14" high model, 168 for 24" high model.
- Screw Tapping (Washer Head Seal Tight) (.25-14 x .75): 157 pieces for both models.
- Foam Gasket (3/4 x 1 1/4): 126 feet for both models – used for sealing the top surfaces of the curb.
- Tacky Tape (3/4 x 1/8): 100 feet for both models – used for sealing condenser panels and flashings.

Usage Features

The installation process is sequential and emphasizes precision to ensure structural integrity and proper sealing.

Modular Assembly: The curb is assembled from various panels (Side, End, Brace, Supply) using 3/8" bolts, allowing for a structured and manageable installation. Splice channels are used to connect sections, ensuring a continuous and rigid structure.
"IN SQUARE" Requirement: A critical instruction throughout the assembly is to ensure each curb section is "IN SQUARE." This is vital for maintaining the structural integrity and ensuring the rooftop unit fits correctly.
Condensation Management: The design incorporates sloped condenser panels and strategically placed support rails (K) to facilitate the runoff of condensation. Condenser pans must slope downward toward End Panel (H) to prevent water accumulation.
Sealing:
- Foam Gasket: A 3/4 x 1-1/4" foam gasket is installed on top of all curb surfaces to create a seal between the curb and the rooftop unit.
- Tacky Tape: 3/4 x 1/8" tacky tape is applied in specific locations, particularly under the edges of condenser panels and flashings, to provide a watertight seal. This tape is applied along the condenser panel between the 1" flange and the curb side, and also by holes and on all support rails.
- Condenser Panel Flashing (N): These sloped flashings are installed over the curb's 2" edge to protect against water ingress.
Roofing Integration: The curb design includes a wood nailer for attaching roofing felt and counter flashing (field supplied). Rigid insulation and cant strips (field supplied) are also part of the recommended roofing integration, illustrating a comprehensive approach to weatherproofing.
Critical Dimensions: The manual highlights that "All dimensions are critical to ensure proper fit of the unit to the curb." This underscores the importance of accurate measurements and assembly during installation.

Maintenance Features

While the document primarily focuses on installation, several aspects contribute to long-term maintenance and performance:

Galvanized Steel Construction: The 14 gauge galvanized steel provides inherent resistance to rust and corrosion, reducing the need for frequent maintenance related to material degradation.
Proper Drainage Design: The sloped condenser panels and support rails are designed to prevent water pooling, which is a common cause of corrosion and leaks in rooftop installations. Effective drainage minimizes the risk of water damage to both the curb and the building structure.
Sealing Components: The use of foam gaskets and tacky tape ensures a robust seal against weather elements. Regular inspection of these seals during routine HVAC maintenance can help identify and address potential leaks before they become significant issues.
Modular Design: Should any section of the curb be damaged, its modular construction might simplify repair or replacement of individual panels, though this is not explicitly detailed as a maintenance feature.
NRCA Approval: Being NRCA approved implies that the curb meets certain standards for durability and integration with roofing systems, potentially leading to fewer issues over its lifespan if installed correctly.