HVAC / Thermostats & Controls
Installation Guide for White-Rodgers F61 Series Adaptor Plate
Quick installation guide for the White-Rodgers F61 Series Adaptor Plate. Learn how to mount your 1C20, 1C21, or 1C26 series thermostat to a wall or junction box safely.
Table of contents
Manual images
Click an image to enlargeQuick guide from the manual
The F61 Series Adaptor Plate is designed to facilitate the mounting of 1C20, 1C21, and 1C26 series thermostats. Before beginning any installation, ensure that you have disconnected the electrical power at the main fuse or circuit breaker to prevent electrical shock or equipment damage.
Description
The adaptor plate assembly includes the wall cover plate and the adaptor plate. It is designed to cover junction boxes, wall damage, or markings from old thermostats. It also allows for vertical thermostat mounting on vertical junction boxes.
Installation
The installation method depends on whether you are mounting to a junction box or directly to the wall.
Mounting to a Junction Box
- Ensure the junction box is prepared.
- Use the provided adaptor plate and wall plate.
- Secure the assembly using the provided 6-32 x 3/4 inch flat-head machine screws.
- Follow the specific mounting diagram for your thermostat model (1C20/1C21 or 1C26) to align the base and subbase correctly.
Mounting Directly to the Wall
- When installing the wall cover plate and thermostat directly to the wall, do not use the machine screws provided for junction boxes.
- Use the pointed screws that were supplied with the thermostat itself.
- Ensure the wall plate is positioned correctly before securing the thermostat base.
Practical help
Common problems
Thermostat does not fit the junction box
Use the F61 adaptor plate to allow for vertical mounting on vertical junction boxes.
Unsure which screws to use for wall mounting
Use the pointed screws supplied with the thermostat, not the machine screws included in the adaptor kit.
Before use
- Disconnect electrical power at the main fuse or circuit breaker.
- Verify compatibility with 1C20, 1C21, or 1C26 thermostat series.
- Identify the mounting surface (junction box vs. wall).
- Ensure you have the correct screws for the chosen mounting method.
Specs in practice
- 6-32 X 3/4” flat-head machine screw
- Hardware included specifically for mounting the adaptor plate to a junction box.
Images and diagrams
- Figures 1 and 2 illustrate the assembly sequence for mounting to a vertical junction box.
- Figures 3 and 4 illustrate the assembly sequence for mounting directly to a wall.
Model compatibility
- Compatible with 1C20, 1C21, and 1C26 series digital thermostats.
Manual page author
Emily Carter
User documentation editor
Prepares concise manual descriptions and highlights the most useful setup, operation, and maintenance information for readers.