Amana VCA Service Instructions Manual page 13

PRODUCT DESIGN
COILS AND BLOWER COILS
Amana CCA, CHA, CCH, CHH, CCF, and CHF coils are
designed to be installed with a furnace or air handler unit and
matched with Amana's condensing units to provide high
efficiency heating and cooling. Thermal expansion valves
on the CCA_T, CHA_T, CHH, and CHF coils and restrictor
orifices on the CCA_F, CCH, and CCF coils and BHA_F
blower coils give accurate refrigerant control and provide
reliable operation over a wide range of conditions.
Amana CCA and CHA "A" coils are designed for upflow and
counterflow operation. The CCH and CHH slab coils, and
the CCF and CHF cased "A" coils are designed for horizontal
applications.
The CCA*T, CHA*T, CHH, and CHF units along with BCA*T
blower cabinets include thermal expansion valves with
internal check valves for heat pump applications.
CCA30F*A and CCA60FUA coils have restrictors factory-
installed . The restrictor is sized from the matching 10 SEER
cooling application. Oversized-undersized coils and heat
pump applications will require a change in the restrictor.
: To avoid poor operation and/or equipment damage,
any single-phase reciprocating compressor used with an
expansion valve coil must include hard start components.
BBA and BBC blower cabinets are designed as a two-piece
blower coil. Either the BBA or BBC blower section can be
attached to a CCA*FC*, CHA*TC*, or CHF*TC* cased
evaporator coil. This two piece arrangement allows for a
variety of mix-matching possibilities providing greater flex-
ibility.
The BBC blower cabinet uses a variable speed motor that
maintains a constant airflow despite duct static. It is ap-
proved for applications with cooling coils of up to 0.8 inches
W.C. external static pressure and includes a feature that
allows airflow to be changed by ±15%.
The BBC is intended to be used with a cased evaporator coil
and a condensing unit or heat pump. The blower section of
the cabinet can also be used as an electric furnace. The
electric heating elements are field-installed. Electric heater
kits (EHK-B and ECB_B) are available as sales accessories
for supplemental electric heat.
The BBA and BBC blower cabinets can be positioned for
upflow, counterflow, horizontal right or horizontal left opera-
tion. All units are constructed with R-4.2 insulation. In areas
of extreme humidity (greater than 80% consistently), the
installer should insulate the exterior of the blower with
insulation having a vapor barrier equivalent to ductwork
insulation, providing local codes permit.
The BHA-T coils are equipped with a thermostatic expan-
sion and check valve assembly for refrigerant metering. The
BHA-F coils are equipped with a restrictor orifice.
The coils are designed for upflow, counterflow, or horizontal
application, using two speed direct drive motors on the BHA-
FA & TA models, and ECM (variable speed) motor on the
BHA-TB models.
BMA air handlers are equipped with a solid state control
board which controls the fan, heater, and safety limit opera-
tions. The coils in the BMA air handler incorporate an
"Aeroquip" distributor with the orifice sized for RHA (11
SEER) outdoor unit. When matching this air handler with an
Amana cooling only condenser (RCB, RCC, RCE, or VCA)
or when over sizing/under sizing the air handler, the orifice
must be changed to match the outdoor unit. Increased
efficiency may be obtained by changing the orifice to a
thermostatic expansion valve system. TXV kits 04, 05 or 06
contain the appropriate "Sporlan" expansion device for the
BMA air handlers.
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