Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8
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Location
The PLC is located in the unit control center. Open the front door and remove the
cover to the control center.
On the right side of the PLC there is a small door. Behind the door is a three position
micro switch and two control adjustments- an anti short cycle timer and a defrost
timer. Each control can be adjusted by turning the knob with a small flat head
screwdriver. The indicator on the knob is the gap between the two protrusions with
the hollow centers on the knob. (See drawing below). For both control timers, turning
the knob clockwise increases the time period. NOTE: Scholar III air conditioners do
not have the defrost function.
The micro switch has three positions –
RUN, TERM & STOP
. The switch should be
in the
RUN
position during normal operation.
Term
is for operation from a remote
terminal.
Stop
is no output/non-operational.
The
Anti-short Cycle Timer (ASCT)
is located to the far left of the switch. The
anti-short cycle timer prevents the compressor from destructive short cycling by
