MABRU POWER SYSTEMS SC Series Installation Manual page 7

Air Filters -
Air filters are necessary to remove air borne particulates from the cabin air and to keep the evapo-
rator coil clean. One, and only one, air filter must be installed for each air conditioner unit. Install the air filter
either on the ale unit or in the return air (RA) grill. The ale unit air filter mounts in the slots in front of the evapora-
tor coil (behind the condenser coil). Or, the return air filter attaches to the back of the RA grill. Clean the air filters
regularly as per instructions in Owner's Control Manual.
Grills and Transition Boxes -
Install the supply air grill as high as possible in a location that will provide
uniform air distribution throughout the cabin; grill louvers should be directed upward. The return air grill should
be installed as low and close to the ale unit as possible to ensure direct, uninterrupted airflow to the evaporator.
The return air grill should have a minimum four inches 4" (101.6mm) of air circulation clearance in front of it, free
from any furniture or other obstructions.
In no instance should a supply air discharge be directed towards a return air grill, as this will cause the system
to short cycle. Allow for adequate clearance behind the supply air grill(s) for the transition box and ducting
connection.
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Page No.7