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switch, exhaust fan interlock, or any other dry contact to override the time clock
schedule.
MDT-Expert Controls:
The AireLogic MDT-Expert (modulating discharge temperature) control system provides
full information regarding unit operation and allows the user to adjust all operational
parameters using the
BACview
panel. See the
Menu Selection Tree for BACview
section
of this manual for more information about navigating the
BACview
menus.
UNIT OFF MODE
Off Mode is the default unit operational mode. To place the unit in Off Mode scroll
through the Unit Modes menu tree, locate the AUTO/OFF/MANUAL branch, and select
OFF. This will place the unit in the OFF mode. The OFF mode prevents the fan and
burner from starting. This mode will override the Time Clock function.
UNIT MANUAL MODE
Manual Mode allows the supply fan to turn on regardless of the Time Clock function. To
place the unit in Manual Mode scroll through the Unit Modes menu tree, locate the
AUTO/OFF/MANUAL branch, and select MANUAL. This will place the unit in the
MANUAL mode.
UNIT AUTO MODE
Auto Mode has two different functions that control the supply fan and unit operation.
They are a time clock function and a signal from an external source to an auxiliary digital
input. To place the unit in Auto Mode scroll through the Unit Modes menu tree, locate
the AUTO/OFF/MAN branch, and select AUTO. This will place the unit in the AUTO
mode. This activates the four Auto mode functions.
Scheduling Time Clock
The MDT-EXPERT control does not support the night setback functions.
The primary Auto Mode function is the Time Clock Schedule. The Time Clock function
allows the user to schedule the operational times of the unit. There are four different
schedules available: 24 hour continuous operation, daily, holiday, and override. The daily
schedule can be programmed for up to 4 separate On/Off events with any combination of
days. The daily schedule sets the typical operational times for the unit. The holiday
schedule can be
programmed for up to 12 separate On/Off events with any combination
of days. The holiday schedule sets the Off times for holidays and other shutdown periods.
The override schedule can be programmed for up to 2 separate On/Off events with any
combination of days. The override schedule sets the On times that will override the
holiday schedule. This scheduling system allows the user to program a diverse array of
On/Off operations. The AireLogic DDC system has no preset On/Off schedule.
To set the On/Off times of the unit scroll through the SCHEDULES menu tree, and locate
the desired Daily, Holiday, or Override branch. Enter the days and times based on the
desired schedule. In the Daily or Override section these times should correspond to the
desired On times for the unit’s operation. In the Holiday section these times should
correspond to the desired Off times for the unit’s operation.
For any schedule to
function the Use tab must be set to yes.
