Cover roof opening if installation of the ERV unit will not be immediate. Failure to cover roof opening could result in water damage and/or serious personal injury.
Assemble the Roof Curb — Connect the curb side and the curb end. See Fig. 1. Insert the tabs on the curb end into the slots on the curb sides. Press firmly until the pieces lock into place. It may be necessary to exert additional force to the top of the curb to lock the pieces in place. Ensure the curb pieces are locked together prior to proceeding.
Repeat for all corners of the roof curb.
Prepare Roof Curb Location — Cut a hole in the roof for duct openings. See Fig.
Install Deck Pans and Duct Supports — The roof curb may have a duct support and deck pans, depending on the model and application. Determine which end of the roof curb will be the duct end.
Install the deck pans on the roof curb with the insulation side facing up toward the ERV base. Install the duct support between the supply and return openings.
Set the Roof Curb — Fit the roof curb assembly by measuring across the corners of the curb to ensure a square fit. Set the roof curb over the roof opening. Level the curb by placing shims under the bottom flange of the curb. Secure the curb in place by welding or fastening the curb to the roof.
Cover the roof curb if installation of the ERV unit will not be immediate. Failure to cover the roof curb could result in water damage and/or serious personal injury.
Install Ductwork — Ductwork will be installed in the roof curb for vertical discharge and
NOTE: Ductwork must be installed before the ERV unit is set in place.
Refer to Fig.
Install Gaskets — The ERV roof curbs come with a gasketing package to provide a seal between the ERV unit and the top perimeter of the roof curb. Install the gasket around the top perimeter of the curb and around the supply and return opening.
NOTE: Some
IMPORTANT: Gasket installation is critical for water integrity. Improperly installed gaskets can result in air or water leaks, leading to poor unit performance.
Install Roofing Materials — Insulate and add a cant strip to the roof curb. Follow suggested and acceptable roofing practices
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SIDE
Fig. 1 — Assembling the Roof Curb
for applying roofing materials. The roofing material should extend up to the wood nailer and be secured under the counter- flashing. Follow all local, national, and industry roofing standards. Refer to Fig. 6 for roofing recommendations.
COUPLED APPLICATIONS — The ERV unit can be in- stalled directly coupled to a Carrier rooftop unit. The connec- tion between the ERV and HVAC (Heating, Ventilation, and Air Conditioning) unit is made with the use of a transition. In a coupled rooftop application there is a separate roof curb for the HVAC curb and a separate roof curb for the ERV unit. See Fig. 4 and 5 for roof curb dimensions.
Locate the Roof Curb — Prior to locating the roof curb con- sider the structural support required for the rooftop system and, the duct drop location in relation to the joists. Allow sufficient space for service, clearance, and locations of vents or other sources of air. Refer to the rooftop installation instructions for more information regarding location considerations.
Assemble the Roof Curb — Connect the curb side and the curb end. Insert the tabs on the curb end into the slots on the curb sides. Press firmly until the pieces lock in to place. It may be necessary to exert additional force to the top of the curb to lock the pieces in place. Ensure the curb pieces are locked to- gether prior to proceeding.
Repeat for other corners of the roof curb.
NOTE: If lifting or moving the roof curb assembly hammer the tabs over 90 degrees.
Install Deck Pans and Duct Supports — The roof curb may have a duct support and deck pans, depending on the model and application. Refer to Fig.
Install the deck pans on the roof curb with the insulation side facing up toward the ERV base. Install the duct support between the supply and return openings.
Install Locator Pieces — Some ERV roof curbs
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