PRODUCT DESIGN
28 Rev. 3
CONDENSING UNIT
The RCA, RCB, RCC and VCB Remote Condensing Units
are made in 1.5 through 5 ton sizes. RCE models are avail-
able in 2 through 5 ton sizes. They are designed for 208-240
volt single phase applications. The RCA/RCB 3, 4, and 5
ton models are also available for 230V and 460V 3 phase
applications. The RCC 3, 4, and 5 ton models are also avail-
able for 230V 3 phase applications.
The condenser air is pulled through the condenser coil by a
direct drive propeller fan. This condenser air is then dis-
charged out of the top of the cabinet.
These units are designed for free air discharge, so no addi-
tional resistance like duct work shall be attached.
The suction and liquid line connections on present models
are of the sweat type for field piping with refrigerant type
copper. Non-back seating valves are factory installed to ac-
cept the field run copper. The total refrigerant charge for a
normal installation is factory installed in the condensing unit.
RCA, RCB, RCC, and RCE units are charged for the match-
ing evaporator coil and a 25 foot refrigerant line set. VCB
Units are charged with refrigerant for 15 feet of 3/8 inch liq-
uid line.
Refrigerant line sizes listed in the Specification section are
for 50 feet or less. For line set in excess of 50 feet refer to S-
120 Refrigerant Piping in the Servicing section.
Systems should be properly sized by heat gain and loss
calculations made according to methods of the Air Condi-
tioning Contractors Association (ACCA) or equivalent. It is
the contractors responsibility to ensure the system has ad-
equate capacity to heat or cool the conditioned space.
RCE models use the Compliant Scroll compressor. There
are a number of design characteristics which are different
from the traditional reciprocating compressor.
- Phase 1 Scroll compressors include a discharge thermo-
stat located beneath the compressor top cap.
- Phase 2 Scroll compressors will not have a discharge ther-
mostat.- Due to their design Scroll compressors are inher-
ently more tolerant of liquid refrigerant.
NOTE: Even though the compressor section of a Scroll
compressor is more tolerant of liquid refrigerant, continued
floodback or flooded start conditions may wash oil from the
bearing surfaces causing premature bearing failure.
- These Scroll compressors use white oil which is compat-
ible with 3GS. 3GS oil may be used if additional oil is re-
quired.
- Phase 1 Scroll compressors may run backwards (noisy
operation) for 1 or 2 seconds at shutdown. This is normal
and does not harm the compressor.
- Operating pressures and amp draws may differ from stan-
dard reciprocating compressors. This information may be
found in the "Cooling Performance Data" section.
- The 3 phase Scroll Compressors are direction of rotation
sensitive. It will rotate in either direction depending on the
phasing of the power. Verification of proper rotation is made
as follows.
1. Install gauges and verify that the suction pressure drops
while the discharge pressure increases.
2. Listen for normal compressor sound levels. Reverse rota-
tion results in elevated or unusual sound levels.
3. Reverse rotation will result in substantially reduced amp
draw from tabulated values.
To correct improper rotation, switch any two power supply
leads at the outdoor unit contactor.
There is no negative impact on durability caused by operat-
ing 3 phase compressors in reversed rotation. The compres-
sors internal protector will trip, de-energizing the compres-
sor.
COILS AND BLOWER COILS
Amana CCA, CHA, CCH, CHH, CCF and CHF coils are de-
signed to be installed with a furnace or air handler unit and
matched with Amana's condensing units to provide high effi-
ciency 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.
The CCA_T, CHA_T, CHH, and CHF coils along with BCA_T
blower cabinets include non-bleed thermal expansion valves.
To avoid poor operation and/or equipment damage, any single-
phase reciprocating compressor used with a expansion valve
coil must include hard start components.
BBA and BBC model blower cabinets are designed as a two
piece blower coil. The BBA/BBC is the blower section which
attaches to a CCA__FC_, CHA__TC_, CCH__FC_, or
CHF__TC_ cased evaporator coil. This two piece arrange-
ment allows for a variety of mix-matching possibilities provid-
ing greater flexibility.
BBC models use a variable speed motor that maintains a
relatively constant airflow regardless of duct static. BBC
models are approved for applications with cooling coils of up
to 0.8 inches W.C. external static pressure. The BBC's in-
clude a feature that allows airflow to be changed by ±15 per-
cent. If lower airflow is desired, place the "ADJUST" pin on
the "-" setting. If higher airflow is desired, place the "AD-
JUST" pin on the "+" setting.
As a modular blower coil the intended use is for application
with a cased evaporator coil and a condensing unit or heat
pump. The blower section may also be used as an electric
furnace. In either case, electric heating elements are field
installed.
The unit may be positioned for upflow, counterflow, horizon-
tal right or horizontal left operation. All units are constructed
with R-4.2 insulation. In areas of extreme humidity (greater
than 80% consistently), the installer should insulate the ex-
terior of the blower with insulation having a vapor barrier equiva-
