Chamberlain LiftMaster Professional SW420 Manual page 5

U L 3 2 5 M O D E L C L A S S I F I C A T I O N S c o n t i n u e d
SAFETY ACCESSORY SELECTION
All UL325 compliant LiftMaster gate operators will accept external
entrapment protection devices to protect people from motorized
gate systems. UL325 requires that the type of entrapment
protection correctly matches each gate application. Below are the
six types of entrapment protection recognized by UL325 for use
on this operator.
ENTRAPMENT PROTECTION TYPES
Type A: Inherent obstruction sensing system, self-contained
within the operator. This system must sense and initiate
the reverse of the gate within two seconds of contact
with a solid object.
Type B1: Connections provided for a non-contact device, such as
a photo eye can be used as a secondary protection.
Type B2: Connections provided for a contact sensor. A contact
device such as a gate edge can be used for secondary
protection.
Type C: Inherent adjustable clutch or pressure relief valve.
Type D: Connections provided for a control requiring continuous
pressure to operate the operator open and close.
Type E: Built-in audio alarm. Examples
include sirens, horns or buzzers.
NOTE: UL requires that all installations must
have warning signs placed in plain view on
both sides of the gate to warn pedestrians of
the dangers of motorized gate systems. Many
signs and labels are included with each
operator.
This document is current with the UL325 specification at the time of printing. However please check the most current version of UL325 for update
information.
UL325 ENTRAPMENT PROTECTION REQUIREMENTS
UL325
Installation
Class
Class
I & II
Class III
Class IV
The chart above illustrates the entrapment protection requirements
for each of the four UL325 classes.
In order to complete a proper installation you must satisfy the
entrapment protection chart shown above. That means that the
installation must have one primary means of entrapment protection
and one independent secondary means of entrapment protection.
Both primary and secondary entrapment protection methods must
be designed, arranged or configured to protect against entrapments
in both the open and close directions of gate travel.
For Example: For a gate system that is installed on a single-family
residence (UL325 Class I) you must provide the following: As your
primary type of entrapment protection you must provide
• Type A inherent (built into the operator) entrapment sensing and at
Moving Gate Can Cause
least one of the following as your secondary entrapment protection:
Injury or Death
KEEP CLEAR! Gate may move at any
• Type B1- Non-contact sensors such as photo-eyes,
time without prior warning.
Do not let children operate the gate or
• Type B2- Contact sensors such as gate edges or
play in the gate area.
This entrance is for vehicles only .
• Type D- Constant pressure control.
Pedestrians must use separate entrance
5
GATE OPERATOR ENTRAPMENT PROTECTION
Slide Gate Operator
Primary Secondary
Type Type
B1, B2
A
or D
A, B1, B2 A, B1,
D or E
or B2
A, B1, B2 A, B1, B2,
D or E
or D
Swing & Gate Barrier
(Arm) Operator
Primary Secondary
Type Type
A, B1, C,
A or C
or D, B2
A, B1, C
D or E
or C
A, B1, C A, B1, C,
or D D or E