
PRODUCT DESIGN
3
Amana PCA Package Cooling Units are designed for out-
door installations only in either residential or light commer-
cial applications.
The connecting ductwork (Supply and Return) can be con-
nected for either horizontal or vertical airflow. In the vertical
application a matching Roof Curb is recommended.
Areturnairfiltermustbeinstalledbehindthereturnairgrille(s)
or provision must be made for a filter in an accessible loca-
tionwithinthereturnairduct.Theminimumfilterareashould
not be less than those sizes listed in the Specification Sec-
tion. Under no circumstances should the unit be operated
without return air filters.
A 3/4" pipe and external drain trap is provided for removal of
condensate water from the indoor coil. (Do not reduce the
drain line size.)
Refrigerant flow control is achieved by use of restrictor ori-
fices.
The single phase units use permanent split capacitor (PSC)
designcompressors. Startingcomponentsarethereforenot
required. A low MFD run capacitor assists the compressor
to start and remains in the circuit during operation.
The outdoor fan and indoor blower motors are single phase
capacitor type motors.
Air for condensing (cooling cycle) is drawn through the out-
door coil by a propeller fan, and is discharged vertically out
the top of the unit. The outdoor coil is designed for .0 static.
No additional restriction (ductwork) shall be applied.
Conditioned air is drawn through the filter(s), field installed,
across the coil and back into the conditioned space by the
indoorblower.
PCA42C*toPCA60C*modelpackageunitsusetheCopeland
Compliant Scroll compressor, there are a number of design
characteristics which are different from the traditional recip-
rocatingcompressor.
- Due to their design Scroll Compressors are inherently
moretolerantof liquid refrigerant. NOTE:Eventhoughthe
compressorsectionofaScrollcompressorismoretoler-
ant of liquid refrigerant, continued floodback or flooded
start conditions may wash oil from the bearing surfaces
causingprematurebearingfailure.
- Scroll Compressors use white oil which is compatible
with 3GS oil which may be used if additional oil is re-
quired.
- Operatingpressuresandampdrawsmaydifferfromstan-
dard reciprocating compressors. This information may
be found in the "Cooling Performance Data" section.
LocationandClearances
36"
Maximum
Overhang
48" Minimum
Overhang
36" Side
Clearance
for Servicing
Recommended
Minimum 36"
Clearance for
Service Required 0" Minimum
Clearance to
Combustibles
Vinyl Coated
Canvas
Connections
Insulated
Return
Duct
Insulated
Supply
Duct
24" Clearance
(Condenser End)
Ininstallations where the unitis installed above groundlevel
andnot serviceable from the ground (Example: Roof Top in-
stallations)theinstallermustprovideservice platform for ser-
vicepersonwithrailsorguardsinaccordancewithlocalcodes
orordinancesorintheirabsencewiththelatesteditionofthe
UniformMechanical Code Section 305.
NOTE: Unitcanalsouseroofcurb (and platform for leveling,
where necessary) to utilize bottom discharge.
WARNING
TOPREVENTPOSSIBLEPROPERTYDAMAGE,THEUNIT
SHOULDREMAININANUPRIGHTPOSITIONDURINGALL
RIGGING AND MOVING OPERATIONS. TO FACILITATE
LIFTINGANDMOVING IF ACRANEIS USED, PLACETHE
UNITINANADEQUATECABLE SLING.
IMPORTANT: If using bottom discharge with roof curb,
ductwork should be attached to the curb prior to installing
the unit.
Refer to Roof Curb Installation Instructions for proper curb
installation. Curbing must be installed in compliance with
the National Roofing Contractors Association Manual.