Page10
15” & 24” Series
Technical Services Manual
SMR-0014
SECTION 3
Normal Vapor/Compression Cycle
Refrigeration
Refrigerant is pumped from the compressor to the
condenser as a high-pressure, high-temperature
vapor.
As the refrigerant cools in the high-pressure con-
denser, the vapor condenses into liquid. During
this phase change, a great amount of heat is re-
jected with the assistance of the condenser fan.
The liquid then flows to the dryer where it is
strained and filtered. From the dryer, the refriger-
ant flows through the capillary tube, which meters
the liquid refrigerant to the evaporator.
As the low-temperature refrigerant passes through
the evaporator coil, it continues to absorb a lot of
heat, causing the boiling action to continue until
the refrigerant is completely vaporized. It is during
this phase change that the most heat is absorbed
(the cooling takes place) in the refrigerator.
The refrigerant vapor leaving the evaporator trav-
els through the suction line to the compressor inlet.
The compressor takes the low-pressure vapor and
compresses it, increasing both pressure and tem-
perature. The hot high-pressure gas is pumped
out the discharge line and into the condenser. The
cycle continues.
Compressor Specifications
The compressors used in
15” & 24” Serie
s Re-
frigerated Cabinets are constructed using stan-
dard reciprocating hermetic style compressors.
Fan Motors
(All Models)
The condenser and evaporator fan motors are
identical. The fan was specifically selected for the
design for maximum efficiency of the refrigeration
system and to minimize noise, both air movement
and mechanical noise from the motor.
The fan is a Tubeaxial or pancake fan. The electri-
cal specifications are 115VAC, 50/60 Hz, 120/100
mA, 9/8 W. The motor has a resistance of 400
ohms +/-3%. The motor comes equipped with two
uninsulated male 1/8” quick connect terminals.
The blade spins clockwise when the struts from
the center-hub are towards you.
The condenser fan motor is mounted to the outside
of the condenser fan shroud within the machine
compartment with #8 screws and pulls air through
the condenser coil (air is pulled in the grille in front
of the coil (left end of grille) and pushed out the
right end of the grille.
The evaporator fan motor is mounted to the inter-
nal back wall of the cabinet. The air is drawn in
through the louvered openings at the bottom of the
evaporator cover panel, pulled through the evapo-
rator coil and pushed out through the fan guard.
