Trane BAYTWGR0004 Top Kit

The Trane BAYTWGR0004 WeatherGuard Top Kit is the factory plastic top accessory for Trane and American Standard outdoor units that ship without a plastic top. The BAYTWGR0004 is the kit for 37 inch x 34 inch (W x D) base sizes, and it is the larger sibling of the BAYTWGR0003, which covers 33 inch x 30 inch bases. Trane describes the WeatherGuard top as protection for a heat pump from rain, snow, leaves and debris that collect on the unit, and the BAYTWGR0004 is the part number you order to get it on a 37 x 34 base. The American Standard equivalent of this kit is numbered BAYAWGR0004.

The kit is a complete bolt-together assembly with no loose-part guesswork. The Trane installer's guide 18-HH32D1-1C-EN lists the contents: one plastic top, one adapter ring, three small support clips, one large support clip, four #12 screws and one foam gasket. The adapter ring seats on the unit's existing sheet metal top, the support clips snap onto the ring, and the plastic top sits on the ring and is fastened to the four clips with the #12 screws. The 004 kit adds 7.75 inches of height to the unit, compared with 7.06 inches for the 003 kit, so plan for that extra height when you check overhead clearance. The factory photo shows the black molded plastic top with its slotted grille corners, the separate black adapter ring and the loose support clips and screws.

Installation is straightforward but it has to be done in order. Clean the control box corner with soap and water, dry it, wipe it with isopropyl alcohol and apply the foam gasket. Set the adapter ring on the unit with its control box corner flush against the gasket and tap the other three corners down with a rubber mallet until the tabs engage under the unit's screws. Attach the three small clips, then the large clip with its alignment tab facing out, then seat the plastic top with the bump-out corner over the control box and hand-tighten the #12 screws. Do not remove the sheet metal top or the fan grille before installing the kit, and do not over-tighten the screws.

Key Benefits

• Factory fit for 37 x 34 bases: The BAYTWGR0004 is the Trane OEM top kit for 37 inch x 34 inch (W x D) base sizes, not a universal cover.
• Complete kit: Includes the plastic top, adapter ring, four support clips, four #12 screws and the foam gasket called for in the 18-HH32D1-1C-EN installer's guide.
• Weather and debris protection: Keeps rain, snow, leaves and debris from collecting on top of the unit, which is what the WeatherGuard accessory is designed to do.
• Clear sibling numbering: Distinct from the BAYTWGR0003 (33 x 30 base) and the American Standard BAYAWGR0004, so you can order by the exact number for your unit.

Common Questions

What base size does the BAYTWGR0004 fit?
It is the kit for 37 inch x 34 inch (W x D) base sizes. The smaller BAYTWGR0003 is for 33 inch x 30 inch bases. Measure the unit base before you order.

Is the BAYTWGR0004 for Trane or American Standard units?
The BAYTWGR0004 is the Trane part number. The same kit under the American Standard badge is the BAYAWGR0004. The installer's guide covers both families and applies to units purchased without a plastic top.

Does it add height to the unit?
Yes. The 004 kit adds about 7.75 inches, versus 7.06 inches for the 003 kit, so check clearance above the unit before you install it.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.