– 47 –
This feature allows outside air into the room.  The 
door is secured with two screws from the factory 
that must be removed upon installation if the 
customer would like to use this feature.  The 
damper assembly consists of a door, lter, rod 
and wing nut.  The wing nut can be loosened and 
the rod may be slid back which opens the door.  It 
then can be locked into place by tightening the 
wing nut.
  Damper Door
  Make-Up Air Module (MUAM)
(Continued next page)
The hospitality industry has many building and 
occupancy codes they must follow.  One of
those codes is for introducing fresh air into guest 
spaces.  Past codes allowed fresh air to pass
under the entry door or a separate vent into the 
room.  Some GE Appliances Zonelines have a 
fresh air feature built into the product, this feature 
is called a Make Up Air Module.  The feature 
includes a self-contained sealed system and 
control module with a motorized duct door system.  
This feature allows outdoor air to be conditioned 
and enter the room through a ducted bulkhead
assembly.
The MUAM is designed to turn the compressor off 
when outdoor temperature is below 50°F or
if relative humidity is lower than 55%.  It will turn 
on when relative humidity is above 55%.  The
module is automatically turned on and off by the 
microcontroller contained within the module’s
electrical box.
The system is comprised of two components 
which are the MUAM and the damper door.  The
MUAM is attached to the base pan and includes 
all sealed system components, fans and
controls for the MUAM.  The damper door is an 
assembly that is separate from the module and
is installed in the bulkhead opening.
Please refer to Auxiliary Set Button in the 
Operation section of this guide to turn the MUAM 
On or Off.
Fans
Control
Damper Assembly