10
Vl. Circulating Air and Filters
Airflow Conversion
Units can easily be converted from horizontal to vertical
airflow delivery.
Units will ship from the factory ready for horizontal
airflow. If conversion to vertical airflow is necessary,
proceed as follows:
•
Cut insulation around bottom openings and remove
panels from the bottom of the unit, saving the screws
holding the panels in place.
•
Use horizontal duct cover kit (CHK001*).
Figure 7
Horizontal Duct Cover Kit
Ductwork
Duct systems and register sizes must be properly de-
signed for the C.F.M. and external static pressure rating
of the unit. Ductwork should be designed in accordance
with the recommended methods of Air Conditioning
Contractors of America Manual D (Residential) or Manual
Q (Commercial). All ductwork exposed to the outdoors
must include a weatherproof barrier and adequate insu-
lation.
A duct system should be installed in accordance with
Standards of the National Board of Fire Underwriters for
the Installation of Air Conditioning, Warm Air Heating
and Ventilating Systems. Pamphlets No. 90A and 90B.
The warm air supply duct from the unit through a wall
fabricated of combustible material may be installed with-
out clearance. However, minimum clearances for the
unit must be observed as shown in Specification Sheet.
The outlet duct should be provided with an access
panel. This access should be large enough to inspect
the air chamber downstream from the heat exchanger
for any smoke or combustion gas leaks. A cover should
be tightly attached to prevent air leaks.
For horizontal airflow, duct flange dimensions on the
unit are shown in Specification Sheet.
For vertical airflow, the ductwork should be attached to
the roof curb prior to installing the unit. Ductwork dimen-
sions are shown in the Amana PRC roof curb installa-
tion manual.
If desired, supply and return duct connections to the
unit may be made with flexible connections to reduce
possible unit operating sound transmission.
Filters
CAUTION
To prevent property damage due to fire
and loss of equipment efficiency or
equipment damage due to dust and lint
build up on internal part, never operate
unit without a filter installed .
Even though a return air filter is not supplied with this
unit, there must be a means of filtering all return air.
Refer to Specification Sheet provided with unit for filter
size information.
If using the Over/Under Transition Kit, the filter(s) may
be located in the return air duct(s) or return air filter
grille(s). Filters installed external to the unit should be
sized in accordance with their manufacturer recommen-
dations. A throwaway filter must be sized for a maxi-
mum face velocity of 300 feet per minute.
Filter Installation
Important: When installing a filter, the air flow arrows
on the filter must point at the indoor blower.