Hired-Hand Electro Mechanical Controls (Relay-Switches): PC-DB Curtain Controller with Timer Override - Manual (Page 5)

4801-1208 PC-DB-with Timer Override 4
The override also has a three position switch called the manual override switch. This
switch allows you to manually override the controller, or to disable the override
function. The switch positions are explained in the Timer Override Controls chart
below:
Timer Override Controls
Off position with trippers pushed in
(Trippers pushed out will close contacts 3&4
and turn load on).
6. Operation
6.1. Manual Control
When the Automatic/Manual switch is in Manual, the controller will open and close the curtains
or vents whenever the bottom switch is in its open or close position. The center position of the
switch is the off position.
6.2. Automatic Control
When the controller is in automatic, the controller will move the curtains or vents as needed by
the temperature set on the thermostat.
Under normal conditions, the controller will move the machine once every five minutes. The
machine will open if temperature is higher than the thermostat setpoint, and the machine will
close if temperature is lower than the thermostat setpoint.
To adjust the amount of time the machine runs each five minutes:
1. Turn off power to the control box.
2. Find the timer switch.
3. Move the two tabs farther apart to increase the time the curtain machine moves, and
move the tabs closer together to shorten the time the machine moves.
2 3 4 5
M
3-Way
Manual Switch
2 3 4 5
M
2 3 4 5
M
2 3 4 5
M
2 3 4 5
M
ON
ON
OFF
OFF
= Permanent ON
= Automatic
= Permanent OFF