UEi Test Instruments AK900SC User Manual

Page 17

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17

Once the temperature probe is connected to the analyzer, the system
automatically enters t mode after several seconds. Several operation
modes are then available through the MODE key:

t mode
The temperature of the probe is shown on the lower right, following t.
It is in ºF or ºC, depending on the unit selected. Depending on the
measurement and sensor contact, it takes 30 seconds to 2 minutes for
the sensor to settle to the correct temperature reading.

SH mode
The superheat mode is useful when verifying proper operation, to
safeguard against compressor damage. Secure the temperature probe
on the compressor suction line. Ensure the correct refrigerant is
selected. If the system is operating properly, superheat should be
between 10 to 30°F (5 to 15°C) while the compressor is operating
steady-state. If superheat is negative, the compressor may be drawing
some liquid.

SC mode
The subcooling mode is useful to verify full condensation. Some
systems required subcooling for proper operation; refer to the
equipment specifications. Secure the temperature probe on the
condenser outlet line. Ensure the correct refrigerant is selected. If
subcooling is negative, the refrigerant is not completely condensed,
indicating poor heat rejection.

Backlight
In order to turn on the green backlight you will need to push on and
hold down the units button for 5 seconds. This will then turn on the
backlight for the duration of the 15 minute on cycle.

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