Daikin REYQ120AATJ Series, Installation Manual

Page: 43 / 51

40 English
• Mild
Overshoot (during heating operation) or undershoot (during cooling
operation) is allowed compared to the requested refrigerant tem-
perature, in order to achieve the required room temperature very
fast. The overshoot is not allowed from the start up moment. The
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tion mode above.
In case of cooling operation the evaporating temperature is allowed
to go down to 43°F (6°C) on temporary base depending on the
situation.
In case of heating operation the condense temperature is allowed
to go up to 115°F (46°C) on temporary base depending on the situ-
ation.
When the request from the indoor units becomes more moderate,
the system will eventually go to the steady state condition which is
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The start up condition is different from the powerful and quick
comfort setting.
• To activate the mild comfort setting under cooling operation,
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• To activate the mild comfort setting under heating operation,
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• Eco
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operation method (see above) is kept without any correction, unless
for protection control.
• To activate the mild comfort setting under cooling operation,
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• To activate the mild comfort setting under heating operation,
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No matter which control is selected, variations on the behavior of the
system are still possible due to protection controls to keep the unit
operating under reliable conditions. The intentional target, however,
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consumption and comfort, depending on the application type.
15.4. Test operation
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is obliged to verify correct operation. Therefore a test run must be
performed according to the procedures described below.
15.4.1. Precautions before starting test operation
During test operation, the outdoor units, the Branch Selector units and
the indoor units will start up:
• Make sure that the preparations of all Branch Selector units and all
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etc.). See installation manual of the Branch Selector units and the
indoor units for details.
CAUTION
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When the fan is rotating at high speed, it will cause injury.
CAUTION
Do not perform the test operation while working on the Branch Selec-
tor units and the indoor units.
When performing the test operation, not only the outdoor units, but the
connected indoor units will operate as well.
Working on indoor units or Branch Selector units while performing a
test operation is dangerous.
CAUTION
• During tests never pressurize the appliances with a pressure higher
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plate of the unit).
•
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• Never directly touch any accidental leaking refrigerant. This could
result in severe wounds caused by frostbite.
• Test run is possible for ambient temperatures between 23°F and
95°F (-5°C and 35°C).
DANGER: DO NOT TOUCH PIPING AND INTERNAL PARTS
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DANGER:ELECTRICAL SHOCK
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• Provide a logbook and machine card.
In accordance with the applicable legislation, it may be necessary to
provide a logbook with the equipment containing at least: informa-
tion on maintenance, repair work, results of tests, stand-by periods,
etc.
INFORMATION
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compressor), required power input may be higher. This phenomenon
originates from the compressor that requires a 50 hour run elapse
before reaching smooth operation and stable power consumption.
Reason is that the scroll is made out of iron and that it takes some time
to smooth the surfaces that make contact.
NOTE
To protect the compressor, be sure to turn on the power supply 6
hours before starting operation.
15.4.2. Test operation
The procedure below describes the test operation of the complete
system. This operation checks and judges following items:
• Check of wrong wiring (communication check with indoor units).
• Check of the stop valves opening.
• Judgment of piping length.
On top of this system test operation, Branch Selector units and indoor
units operation should also be checked separately.
•
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installation. Otherwise, the error code U3 will be displayed on the
user interface and normal operation or individual Branch Selector
unit and indoor unit test run cannot be carried out.
• Abnormalities on Branch Selector units and indoor units can-
not be checked for each unit separately. After the test opera-
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units one by one by performing a normal operation using
the user interface. Refer to the Branch Selector units and the
indoor units installation manual for more details concerning
the individual test run.
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