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Also included is access to an area of the controller where the TCS model and serial number can
be stored. The controller software and firmware version are also displayed.
6.4.7.1 Clear Alarm Event Log
Clicking this button erases any old information in the alarm log and resets all of the messages to
the default “OK - No Alarm” condition.
6.4.7.2 Enable Economizer Operation.
Checking this check box enables economizer operation. If the air-conditioners controlled by the TCS do
not have economizers economizer operation should be disabled. This disables two stages of cooling that
are normally used to energize the economizers if free cooling is available. Factory default for this value
is enabled.
6.4.7.3 Economizer Changeover Scheme
The economizer changeover scheme is selectable between enthalpy changeover or dry bulb temperature
changeover. The default for this is enabled. When enthalpy changeover scheme is used the economizers
will be used as 1
st
and 2
nd
stage cooling as long as the outdoor enthalpy is below the Enthalpy
changeover setpoint. When dry bulb temperature scheme is used the economizers will be used as 1
st
and
2
nd
stage cooling as long as the outdoor temperature is below the dry bulb temperature changeover
setpoint. Clicking the button will change to the opposite changeover scheme.
6.4.7.4 Enable Daylight Savings Time
This checkbox enables daylight saving time for the controller hardware clock. If the site location
is in an area that does not use daylight savings time during the summer uncheck this box. The default
setting for daylight savings time is enabled.
6.4.7.5 Enable 50 hz Clock
This checkbox enables 50hz clock operation. If the site location is in an area has 50 hz power
supplies check this box. This assumes correct operation of the hardware clock. The default setting for
Enable 50 hz clock is disabled.
6.4.7.6 Enable Zone Humidity Sensor
The TCS can be ordered without an indoor humidity sensor. The model number will have a “T”
in the 7
th
position of the model number if no humidity sensor was ordered. Factory default for this value
is enabled. If the TCS does not have an indoor humidity sensor disable this feature.