TRANE BAYBASE205 Downflow Gas-Fired Furnace Subbase Installation Guide
- June 10, 2024
- Trane
Table of Contents
TRANE BAYBASE205 Downflow Gas-Fired Furnace Subbase
Product Information
The product mentioned in the user manual is the BAYBASE205 Downflow Gas-Fired Furnace Subbase. The sub-base is designed to be used with furnaces installed on combustible flooring. The installation of the sub-base must comply with national, state, and local codes. The duct sizes, floor opening, and plenum opening dimensions are given in Table 1 and Figure 1 respectively. The clearances between the plenum and combustible surfaces must be equal to or greater than those shown on the clearance label on the particular furnace. Flanges should be formed on the plenum as shown in Figure 2.
Product Usage Instructions
- Unpack the sub-base and prepare the floor opening as shown in Figure 1. If joists are cut, headers should be provided on either side of the opening to support the base and furnace.
- Check local building codes for requirements on floor loading and support.
- Slide the two halves of the sub-base together, being sure to have the tabs on the outside of both overlapping pieces.
- Slide and match the holes on either end to the appropriate width of the furnace (14-1/2, 17-1/2, 21, or 24-1/2).
- Secure the two pieces together with two sheet metal screws (included).
- Bend the two tabs on each side and a tab on one end (which will be to the back of the furnace) up. These will be used to locate and secure the furnace.
- Set the base on the floor over the opening and secure it to the edge of the flooring with screws or nails through the four holes provided under the side tabs.
- Position insulation over the sub-base.
- Insert the supply duct connection (plenum) through the subbase using care to retain the insulation position.
- Place the furnace in position over the sub-base assembly with the back of the furnace against the back tab.
- Drill through the tabs into the furnace cabinet and secure the furnace in position with sheet metal screws.
It is important to note that this document is customer property and must remain with this unit. Please return it to the service information pack upon completion of work.
IMPORTANT
This Document is customer property and is to remain with this unit. Please return to the service information pack upon completion of work.
GENERAL
The Subbase is designed for use with furnaces installed on combustible flooring. Installation is simple and when properly installed meets the requirements of the American Gas Association.
INSTALLATION OF Subbase
- With the subbase unpacked, prepare the floor opening.
- The floor opening required is shown in Figure 1. If joists are cut, headers should be provided on either side of the opening to support the base and furnace. Check local building codes for requirements on floor loading and support.
- Duct sizes are shown in Table Figure 1.
CABINET WIDTH| RETURN DUCT WIDTH| FLOOR OPENING| PLENUM OPENING
---|---|---|---
“A”| “B”| “A”| “B”
14-1/2”| 13-1/4”| 13-5/8”| 20-3/8”| 12-5/8”| 19-3/8”
17-1/2”| 16-1/4”| 16-5/8”| 20-3/8”| 15-5/8”| 19-3/8”
21”| 19-3/4”| 20-1/8”| 20-3/8”| 19-1/8”| 19-3/8”
24-1/2”| 23-1/4”| 23-5/8”| 20-3/8”| 22-5/8”| 19-3/8” - Clearances between the plenum and combustible surfaces must equal or exceed those shown on the clearance label on the particular furnace. Flanges should be formed on the plenum as shown in Figure 2.
- Slide the two halves of the sub-base together, being sure to have the tabs on the outside of both overlapping pieces.
- Slide and match the holes on either end to the appropriate width of the furnace (14-1/2”, 17-1/2”, 21,” or 24-1/2”).
- Secure the two pieces together with two sheet metal screws (included).
- Bend the two tabs on each side and a tab on one end (which will be to the back of the furnace) up. These will be used to locate and secure the furnace.
- Set the base on the floor over the opening.
- Secure the base to the edge of the flooring with screws or nails through the four holes provided under the side tabs.
- Position insulation over the sub-base.
- Insert the supply duct connection (plenum) through the subbase using care to retain the insulation position.
- Place the furnace in position over the sub-base assembly with the back of the furnace against the back tab.
- Drill through the tabs into the furnace cabinet and secure the furnace in position with sheet metal screws.
About Trane and American Standard Heating and Air Conditioning Trane and American Standard create comfortable, energy-efficient indoor environments for residential applications. For more information, please visit www.trane.com or www.americanstandardair.com The manufacturer has a policy of continuous data improvement and it reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.
18-CH12D15-1B-EN 03 Apr 2023 Supersedes 18-CH12D15-1A-EN (July 2020)