RYTEC Pharma-Roll, Installation Manual

14

INSTALLATION—PNEUMATIC REVERSING EDGE SWITCH ADJUSTMENT

PNEUMATIC REVERSING EDGE SWITCH 
ADJUSTMENT

Do not stand under the door panel when
making check. If reversing edge switch is
not working properly, panel could strike
person performing check.

To check the reversing edge switch operation, run the 
door through the down cycle. As the door is lowering, 
tap the bottom of the reversing edge. If the reversing 
edge switch is operating properly, the door should 
immediately reverse and run to the full open position. 
Push the control box push button to close the door after 
the check is completed.

If the door does not reverse, check the air bleed and 
sensitivity of the reversing edge switch. The switch is in 
the bottom bar on the side opposite the door motor.

Reversing Edge Switch Air Bleed Check

1.

The reversing edge switch is located inside the bot-
tom bar assembly. To inspect and/or adjust the 
switch, remove the access cover from the face of 
the bottom bar assembly. (See Figure 32.)

Figure 32

2.

Make sure the clear PVC hose is in tight contact 
with the air input post so that air leakage cannot 
occur and that vibration will not cause the hose to 
fall off. Make sure the hose is not kinked. 
(See Figure 33.)

3.

The air bleed has been set at the factory and should 
not require adjustment. To check the air bleed, turn 
the air bleed adjustment screws located on the front 
and back of the switch fully clockwise, but do not 
overtighten. Then turn the screws back counter-
clockwise one full turn. (See Figure 33.)

Figure 33

Reversing Edge Switch Sensitivity Adjustment

1.

The reversing edge switch is a normally open con-
tact. The PVC hose is on the lower air input post. To 
adjust the switch, first remove the wires and resistor 
from the contact terminals and attach an ohmmeter 
across the two terminals. (See Figure 34.)

2.

Turn the adjustment screw, located on the face of 
the switch, clockwise or counterclockwise until con-
tinuity is achieved. Then turn the screw 3/4 turn 
counterclockwise. Ohmmeter should no longer 
show continuity. Turning the screw counterclock-
wise decreases sensitivity. Turning the screw clock-
wise increases sensitivity. (See Figure 34.)

Figure 34

3.

Attach the resistor and wires and then replace the 
access cover on the bottom bar.

NOTE: Replace the resistor and mount to either

the coil cord wires or the reversing edge
switch. The reversing edge connection is
dependent on the resistor being present
on either the coil cord wires or the revers-
ing edge switch.

A7500201

Access Cover

Bottom Bar

Reversing
Edge Switch
(On Side 
Opposite
Door Motor)
 

PVC Hose Must Be Tight
on Lower Input Hose

Air Bleed 
Adjustment
Screw

A7500227

Reversing 
Edge Switch 

to Test and
Adjust Switch

Resistor
 

and Resistor

Remove Wires

Sensitivity
Adjustment Screw

A7500227