Product Design; Refrigeration System; Temperature Controls Electromechanical; Electronic - Amana V Series Service Manual

Product Design

Refrigeration System

A compressor forces hot refrigerant vapor into a fan
cooled condenser made of aluminum tubing and wire.
Air circulated across the condenser cools and
condenses hot vapor into high-pressure liquid (See
Refrigerant Flow Diagram).
From the condenser, liquid refrigerant passes through a
molecular-sieve drier and into a capillary tube. The small
inside diameter of the capillary offers resistance to
refrigerant flow. The resistance increases pressure on
liquid in the capillary and causes relatively lower
pressure inside the evaporator. The difference in
pressure improves evaporation.
Also inside the capillary, temperature of the liquid
refrigerant is reduced because the capillary is routed
through a heat exchanger. In the heat exchanger, hot
refrigerant in the capillary is cooled by refrigerant vapor
of relatively low temperature that flows through the
suction line. The length of the capillary and heat
exchanger are carefully designed for each system.
The evaporator coil is made of aluminum tubing and
sheet metal. The capillary enters the evaporator at top
rear. Refrigerant in the form of liquid and gas flows
through the coil and into the suction line.
The evaporator coil is inside the back wall of the freezer
compartment. There an evaporator fan circulates air
from the freezer and fresh-food compartments, through
the evaporator coil and out, again, into the freezer and
fresh-food compartments.
The large surface area of the evaporator coil facilitates
heat absorption from both fresh-food and freezer
compartments. Temperature of the evaporator at the
end of the cooling cycle varies from -13° to -26°F.
Temperature Controls
Electromechanical
Freezer compartment temperature is regulated by
means of an air-sensing thermostat located at top rear
of the fresh-food compartment. The thermostat senses
freezer compartment temperature by means of a control
capillary that is routed from the thermostat, through a
well, and into the freezer compartment. The thermostat
control should be set to maintain freezer temperature
between 0° and +2°F.
Fresh-food compartment temperature is also
thermostatically controlled. In this case, an air-sensing
thermostat regulates a damper which controls the
amount of cold air that flows into the refrigerator from
the freezer. Fresh-food compartment temperature
should be kept between 38° and 40°F.

Electronic

See "Electronic Controls".
Defrost Controls
Electromechanical
After every 8 hours of compressor run time, a defrost
timer activates the radiant electric defrost heater that is
suspended from the evaporator. After 33 minutes of
defrost time, the timer restores power to the
compressor.
A defrost terminator (thermostat) is wired in series with
the defrost heater and evaporator fan motor. The
terminator opens the defrost circuit when the
temperature of the evaporator reaches a preset high
temperature. When the defrost thermostat opens, it
remains open until the end of the defrost cycle. When
the cooling cycle starts, the terminator senses a preset
low temperature in the evaporator chamber and closes.
The defrost heater is suspended across the bottom of
the evaporator coil so it warms the defrost drain as it
defrosts the evaporator. Defrost water is caught in the
trough under the evaporator coil and flows through a
drain hole and drain tubing, into the drain pan under the
cabinet. Heated air circulated by condenser fan over
drain pan evaporates water.
Electronic
See "Electronic Controls".

Other Features

Deli Drawer
TM
The Deli Drawer TM is a drawer that is mounted in an
extra-cold sleeve within the fresh-food compartment. A
control on the inner wall of the fresh-food compartment
allows freezer air to circulate inside the sleeve, keeping
temperature in the drawer up to 5°F colder than the
fresh-food compartment.
NOTE: Vinyl boot directs freezer air from inlet port to
deli drawer sleeve. Boot must be in place and in
good condition if deli drawer is to work properly.

Beverage Chiller

A control on the left, inner wall of the fresh food
compartment allows freezer air to circulate into
beverage chiller, keeping temperature inside the chiller
up to 4°F colder than the fresh food compartment.
NOTE: Fresh food compartment temperature can be
affected by cold air in beverage chiller and deli
drawer. Refrigerator temperature control may
need adjustment after temperature of deli
drawer or beverage chiller is set.
5 RS1300004 Rev. 1