Information; A/C Circuit Information; Figure 5 Mega-Tec Refrigeration Circuits; Figure 6 A/C Circuit Measurements - Bard MEGA-TEC W090A Service Instructions Manual

Information

The information screens are used as a quick reference to
show unit A/C circuit measurements and program version.

A/C Circuit Information

MEGA-TEC Series wall-mounted air conditioners have
two separate refrigeration circuits: Circuit 1 is located
on the left side of the unit and circuit 2 is on the right
side (see Figure 5).
Circuit 1 utilizes a 2 stage scroll compressor while
circuit 2 uses a single stage compressor. Both circuits
are equipped with an electronic expansion valve that
is used to control superheat of each circuit. Liquid
temperature and pressure are measured to provide
a calculated subcooling for each circuit. Suction
temperature and pressure are also measured to provide
a calculated superheat for each circuit.
Using both circuit 1 and circuit 2, the MEGA-TEC unit
can provide 35%, 80%, and 100% cooling capacity.
Separate refrigeration circuits also allow for operation
of the unit at partial capacity if service is required on
one circuit.
FIGURE 5
MEGA-TEC Refrigeration Circuits
CIRCUIT 1
LEFT HAND
FRONT VIEW
CIRCUIT 2
RIGHT HAND
MIS-4034
A/C Circuit Information can be found in four screens
within the information menu (see Figure 6). The
information and measurements provided are liquid line
temperature, liquid line pressure, condensing saturated
temperature, suction line temperature, suction line
pressures, suction saturated temperature, super heat,
subcooling and electronic expansion valve position.
FIGURE 6
A/C Circuit Measurements
Manual 2100-671C
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