
properly, it must have good air circulation. If the customer has product blocking the air intake such as
soda cans, bottles, loosely wrapped products in plastic bags, etc… these items can block the airflow
to the coil. Without airflow, the cooling performance diminishes quire rapidly preventing cooling and
building ice is the coil further blocking airflow and cooling capacity.
NOISY FAN OPERATION:
• AMBIENT TEMPERATURE: Is the ambient temperature about 100°F or above? The condenser fan
operates with a temperature controlled speed control in order to minimize noise. If the temperature
surrounding the unit is about 100°F, the unit will operate at full speed to cool the unit as needed.
• REQUIRED RUN TIME: Is the unit running for too long? As temperature rises and the refrigerator re-
quires cooling the compressor will get hotter requiring further cooling. thus increasing the fan speed
due to excess heat from the unit.
• RESIDUAL HEAT: Is the unit placed outside in a concrete slab or on a sunny area? Residual heat
that you will have on a hot concrete slab or walkway will in increase condenser fan speed and air is
forced through the condenser coil under the unit. The air going through the intake is next to a hot sur-
face, thus warmed up before entering the unit. Consequently the unit has to work harder to maintain
the proper refrigerating capacity and needs speed up the fan.
• DEBRIS IN THE BAN BLADE: Is there debris in the condenser fan blade? Not only can debris physi-
cally stop the fan blade from rotating (as discussed previously), but is can also block airflow thus pre-
venting the unit for cooling. As the air get hotter in the unit from lack of airflow, the condenser fan will
increase speed to allow more airflow.
• FULLY STOCKED: Is the unit fully stocked? If the unit is not properly stocked or half empty the unit
will have to work harder. Air does not hold temperature, products do. If there is not product in the re-
frigerator the unit will turn ON and OFF several times per hour. If the unit is fully stocked, the run-time
will be extended but also the off-time allowing the compressor to cool down properly between cycles.
This will help the unit run more efficiently as several runs per hour will increase compressor tempera-
tures thus requiring the condenser fan to speed up and provide more airflow to cool the unit.
PERFORMANCE ENVELOP:
The URS-1 has a performance envelop up to 110°F ambient temperature. This means that the unit is
capable of maintaining an internal cabinet temperature between 22°F and 40°F when exposed to 110°F
ambient temperature. The unit will operate without shutting off when the ambient temperature exceeds
100°F in order to maintain the internal cabinet temperature stated above. These peak temperatures oc-
cur at least for a few hours a day on hot weather locations and should be considered normal, under-
standing that the unit will shut down when ambient temperatures return to normal conditions.
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