Initial Test Sequence - Daikin Maverick I Installation And Maintenance Manual

User Interface
Clogged Filter Switch
The clogged filter switch bypass timer is an adjustable time
that can only be activated if the indoor fan is energized. If the
clogged filter switch input is continuously closed until the time
expires, the clogged filter alarm is tripped. The purpose of the
delay is to prevent nuisance trips when the indoor fan is started
or other pulsations in the airflow.
Smoke Alarm Switch
The smoke alarm switch is an input that will lock out the
system when an open switch is detected for 2 seconds. To reset
the system power must be cycled to the unit or an "all clear"
signal must be communicated through the network.
Tenant Override
The DDC Controller allows separate adjustment of
temperature set points and fan operation according to the
building occupancy. This feature is only available when a
thermostat is not controlling the space temperature. For the
following sections, Occupied Mode implies that the
calculation for demand utilizes occupied set points, which are
used to satisfy the comfort in the space. Unoccupied mode
utilizes unoccupied set points and is normally set to save
energy during periods in which buildings are closed and
unoccupied. Tenant Override Mode is a state in which the
control utilizes occupied set points for a limited amount of
time, after which it returns to unoccupied mode. To start
Tenant Override, the user presses a button on the space sensor
for more than 2 seconds.

Initial Test Sequence

The DDC Control allows a technician to Field Commission a
new or existing installation of a package unit with the DDC
control. By entering a password (5555), the technician can
select a cooling test or a heating test. If a cooling test was
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selected, the first stage of cooling is now energized for 5
minutes to check for alarms. At the end of the test, the
temperature sensor readings are displayed. If the technician
connected refrigerant gauges to the unit, the technician can
record their gauge readings along with the sensor temperature
readings for future reference or to calculate refrigerant
superheat. If the unit has two stages of cooling, the next stage
of cooling is now energized for 5 minutes to check for alarms.
At the end of the test, the temperature sensor readings are
displayed. If the technician connected refrigerant gauges to the
unit, the technician can record their gauge readings along with
the sensor temperature readings for future reference or to
calculate refrigerant superheat for the second stage of cooling.
Using the reading from the outdoor air temperature sensor and
the refrigerant pressure and temperature readings, the
technician can verify unit operation obeys the refrigerant
charge chart. The DDC then de-energizes the second stage
compressor, the first stage compressor, and finally the indoor
fan. The test is then terminated. Temporarily shorting across
the "TEST PINS" (P12) on the DDC board during the heating
test will cause the gas valves to energize and de-energize
instead of the compressors. No temperature display is provided
at the end of the gas heat test.
History of alarms
This screen shows the last 10 alarm occurrences of the system.
A new alarm enters in position 1, shifting the other
occurrences one position down.
The last position of the screen allows the user to clear the
entire alarm history, by pressing the enter key.
Current Alarms
This screen shows the current alarms of the system. A
maximum of ten alarms can be displayed.
McQuay OM 1077