PURPOSE OF THE COLEMAN 5725 BLEND AIR RETROFIT KIT
The Coleman Blend Air System found on many mobile homes is now an obsolete system. Most parts are still available, but in time those parts too will be obsolete.
The purpose of the Blend Air System is to vent the attic and bring fresh air to the furnace. Ventilation of the attic is done by the blower on the roof running 4 hours on and 4 hours off 24/7. This is accomplished by an expensive overly-complicated system of 2 circuit control boards (upper and lower) communicating with each other. The lower control board, typically found in a box on the outside of the furnace, also opens a fresh air damper while the furnace is running, and beeps when the motor on the roof is no longer running or there is a communicating error with the upper board.
With this kit the upper (7681-318P/a) and lower (7681-317P/A) boards are replaced with a timer installed in the control box of the blower assembly on the roof. The timer will run the blower 4 hours on and 4 hours off 24/7, exactly like the two circuit boards did. The flapper of the damper is removed and not used.
IMPORTANT: With this updated system, there is no alarm to notify the homeowner that there is a problem with the motor on the roof. If you can’t hear the motor running, then you will need to do a periodic inspection. You will also no longer have a damper that opens and closes for fresh air. The damper will remain open. This is how fresh air systems of other brands work. IF YOU CANNOT ACCEPT THESE CHANGES, THEN DO NOT USE THIS KIT. Instead, repair your system by purchasing the original parts, if still available.
1. Install the timer on the roof by removing the control board and harness and following the wiring instructions written in the detailed instructions.
2. Locate the damper assembly at the top of the furnace. Access the damper by removing the filter. Reach up inside the damper and remove the motor and flapper from inside the damper.
3. Remove the lower control board and tape off the ends of the wires.
The kit includes a timer, wires, connectors and detailed instructions. The blower assembly and other part shown for clarification purposes are NOT included.
NOTE: We recommend this kit be installed by a qualified HVAC technician or electrician and we are not responsible for harm or damages incurred by incorrect installations. We designed and manufactured this kit so please contact us via email for any technical support questions. Most questions are answered within a few hours. Before installation, the blower motor on the roof should be inspected to ensure it is in good working order.
This is an aftermarket kit and is not affiliated with Coleman or its parent companies.
You can read more about Coleman’s blend air systems here.