Service Bulletin 22-0013-MH-1MBTU

To: Notified customers
Date of Notice: 10/7/22
Subject: Maxi-Heat Circulation Cap Switch Upgrade

Product Line: Maxi-Heat 1MBTU
Model: Heater
Serial Numbers: 36-000001 through 36-000796
Expiration Date: No expiration

Description or Summary of Improvement:

1. Heaters without air recirculation duct switches allow the unit to operate with the air caps left on. If the caps are left on, this will lead to  increased cabin temperatures and the burner cycling more frequently. It will also increase the chances of servicing the burner more  often. 

Corrections and Instruction:

1.  Adding this update will help to improve air circulation and further extend the life of the heater. When adding switches to the air  recirculation duct, this will ensure the caps have to be removed when attempting to operate the burner. Please review page two for additional information.

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