• Timer kit replaces both upper and lower circuit boards.
• Runs 4 hours on and 4 hours off as the original control boards intended for it to do..
• Includes detailed installation instructions. Does not include motor..

This aftermarket retrofit timer kit is the perfect replacement for the confusing expensive control boards. This kit will replace both the Coleman upper control board 7681-318P/A and the lower control board 7681-317P/A. 1 year free replacement warranty. 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 wner 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.