Install the Air Duct & Top Mounting Plate for Rooftop RV SystemsUpdated 15 hours ago

Introduction

This article explains how to install the air duct and top mounting plate for Full Inverter Rooftop RV Air Conditioner Heat Pumps. In addition, the article explains how to install the air duct foam.

Remove the panel and installation accessories from the carton.
Reach through the return air inlet of the air conditioner and pull down the wire harness of the outdoor unit to facilitate subsequent connections.
In addition, pull down the four-way connecting wire and sensor lead.

Measure the width from the ceiling to the roof, then select the appropriate air duct foam thickness based on the following guidelines:

For a width of 1-1.2 inches (25-30 mm), use air duct foam with a thickness of 1.5 cm.
For a width of 1.2-1.8 inches (30-45 mm), use air duct foam with a thickness of 3 cm.
For a width of 1.6-2.4 inches (40-60 mm), use air duct foam with a thickness of 4.5 cm.
If the width is greater than 2.4 inches (60 mm), combine air duct foams of 1.5, 3, and 4.5 cm thickness as needed based on the actual situation.
For a distance greater than 3.9 inches (100 mm), use a field-supplied pipe joint.

The air duct foam is available in three thickness: 1.5, 3, and 4.5 cm.

The middle portion of the air duct foam is intended to prevent deformation and should be removed during installation.

Select the appropriate air duct foam thickness, remove the middle portion, and affix it to the fixing plate along the air outlet. Ensure that the holes on the foam align with the holes on the fastening plate.
Align the arrow on the fastening plate toward the front of the RV, position the plate over the 14-1/4 inch x 14-1/4 inch ceiling opening, and secure it to the outdoor unit of the air conditioner on the roof using four bolts of suitable length.

Before fully tightening the bolts, begin by screwing each bolt in by hand. The four rivet nuts on the chassis of the outdoor unit are located at the corners of the opening. Insert and hand-tighten the four long bolts into the corresponding rivet nuts.
Once all the bolts are in place, tighten them evenly, one at a time, with a torque of 3.3-4 ft-lbs. This will compress the box foam on the roof to a thickness of approximately 1/2 inches (13 mm). These bolts are self-locking, so excessive tightening is not necessary.
If the bolts are too loose, the roof may not be adequately sealed. Conversely, overtightening the bolts could cause damage to the air conditioner chassis or the fixing plate. Tighten the bolts according to the torque specifications.

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