Operating instructions

42
NOTE: If the air conditioning unit is attached to the central
furnace, a damper must be installed at the furnace outlet to
prevent cold air from circulating through the furnace heat
exchanger, unless furnace is so equipped to utilize the built-in
furnace relay.
RETURN
RISER X 2
2" X 12" INSULATED
DUCT (MIN.)
90 SQ. IN.
FILTERED
(MIN. X 2)
DISCHARGE
CONDENSER
AIR
SUPPLY AIR
INSULATED
2" X 10" CLOSEABLE
GRILL (MIN. X 4))
ENCLOSED
FLOOR JOIST
FLOORING
FLOOR CUTOUT
90 SQ. IN. MINIMUM
FLOOR CUTOUT
90 SQ. IN. MINIMUM
C. BASEMENT UNITS
MODELS 39224 AND 39424
CONDENSER SECTION:
SUPPLY AIR
The inlet of the condenser coil should be positioned so that
it draws air from outside the vehicle. SPECIAL CARE MUST
BE TAKEN TO PREVENT THE DISCHARGE AIR FROM
RECIRCULATING TO THE INLET OF THE CONDENSER
COIL. Shields should be added to ensure fresh air supply.
DO NOT INSTALL THE CONDENSER WHERE THE FAN
WILL DRAW AIR FROM THE EXHAUST OF THE VE-
HICLE, A MOTOR GENERATOR SET, TRANSMISSION,
ROAD HEAT OR ANY OTHER HEAT PRODUCING
SOURCE.
RETURN SYSTEM
-Risers use interior wall structure
-Using floor joists area for return to unit
-Each return grill is filtered
MIN. 180 SQ. IN.
REQUIRED OPENING
The condenser section is a "draw-through" type. When the
face of the coil is positioned behind a louvered or other type of
restrictive opening, the FREE AREA of the opening must be
at least 460 square inches.
FIELD INSTALLED SHIELD THAT WILL PREVENT
RECIRCULATION OF CONDENSER AIR.