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24
AW16000 - Instruction Manual
1.0 — InSTALLInG THE DCT1000 (COnT’D)
1.2.2
Manual Override Switch Connection
The manual override function allows the system to be set to the run mode regardless of other conditions. This
mode is enabled when the manual override terminal and common are connected. It is disabled when they
are disconnected. If the controller is to be run in continuous mode, a jumper wire may be wired across these
terminals. When manual override is needed on a periodic basis, wire a SPST toggle switch between the manual
override terminal and the common terminal.
1.2.3
Down Time Clean Connection
The down time clean operation forces the system into a run cycle for a programmed length of time
between 0 – 255 minutes. The operation is initiated by connecting the down time clean terminal to a
common terminal. This function is best accomplished through use of an external normally open switch.
1.2.4
Connecting Multiple Timer boards
both master controller boards and slave boards can have up to a maximum of 22 channels each. The system
may be expanded up to 255 channels using master controller boards and slave boards. The DCT1000 will
automatically detect the total number of channels involved and make their outputs available. You will
note that both the master controllers and slave boards have a telephone style connector mounted on the
upper right hand side of the board. These connectors are for use in systems requiring slave boards that
must be daisy chained together to provide additional channel capability. For systems that require the
slave boards, the master controller must not have any connection made to its daisy chain input unless it
is designated as a slave control itself. (For larger systems requiring more than three slave boards, a master
controller must be used as the fourth slave board to satisfy power requirements.) This sequence would
repeat itself until the limit of 255 channels has been reached. The cables used are not ordinary telephone
style cables.
Figure 2
