5
IMPORTANT PRE-ASSEMBLY CHECK
If assembling a motor head unit from a factory sealed box skip this check.
Every Power Head Unit is factory tested and shipped with
the limit switch adjustment in the door CLOSED position.
If the Motor Power Head Unit has been powered up before
assembly, perform the following steps to insure that the
limit switch adjustment is in the door CLOSED position.
Connect Motor Head Unit to a power source and short
across the screw terminals labeled “PB” and “COM” with
a metal screw driver.
Motor should start; run through a full OPEN cycle, and stop.
This will leave Motor Power Head Unit in OPEN position.
To get Motor Power Head Unit back to full CLOSE position,
short and hold motor terminals again. Continue to short
terminals until Motor Power Head Unit stops in the
CLOSED position. Disconnect from power source and
proceed to assembly.
Before you begin, complete the following two tests to insure that the door is balanced and working properly. A door that
binds, sticks or is out of balance could cause severe injury. Do not attempt to compensate for an improperly adjusted door
by the installation of an opener. This will interfere with the proper operation of the opener mechanism and/or may damage
the door. Have a qualified service person make any needed adjustments or repairs to cables, spring assemblies and other
hardware before proceeding with installation.
Door Test One
Raise and lower the door and check closely for any
sticking or binding that occurs.
Lift the door approximately half way open, as illustrated.
When releasing the door, it should stay in position. If
spring pressure pulls the door further open or door
weight pulls it further down, your door is not properly
adjusted.
Door Test Two
When properly installed, a door should remain clear of
the opening, when allowed to rest at its natural, full open
position.
If “door drift” pulls door back into opening or spring ten-
sion is not sufficient to pull door totally clear of opening,
the door is not properly adjusted.
Door Tests Before Starting
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