Chamberlain K74-16420 User manual

INSTALLATION INSTRUCTIONS
APPLICATION REQUIREMENTS:
Replacement of Limit Switch and/or its components for a Model LGO Operator.
LGO Limit Switch Assy
Replacement Kit
K74-16420
WARNING
DISCONNECT POWER AT THE FUSE BOX BEFORE
PROCEEDING. IF NECESSARY REMOVE THE OPER-
ATOR FROM ITS MOUNTED POSITION.
OPERATOR MUST BE PROPERLY GROUNDED AND
CONNECTED IN ACCORDANCE WITH LOCAL ELEC-
TRICAL CODES. NOTE: THE OPERATOR SHOULD
BE ON A SEPARATE FUSED LINE OF ADEQUATE
CAPACITY.
ALL ELECTRICAL CONNECTIONS MUST BE MADE
BY A QUALIFIED INDIVIDUAL.
NOTE: Refer to the Ownerʼs Manual supplied with the
operator for all mounting and wiring instructions.
REMOVE EXISTING LIMIT SWITCH ASSEMBLY:
Disconnect the wire connections to the limit switches.
Remove the six screws from the nut plates. Remove the limit
switches, internal grip washers and standoffs from the elec-
trical box and discard.
Remove the two 1” screws from the locknuts. Remove the
depress plate and depress plate springs and discard.
INSTALLING NEW LIMIT ASSEMBLY:
To install the new limit assembly, follow the steps outlined
above in the reverse order. Reconnect the wires to the new
limit switches.
NOTE: Other components not
shown in box for easier viewing.
NC
NO
OPEN
LIMIT
C
NC
NO
CLOSE
LIMIT
C
WIRE CONNECTIONS
(GY)
(YE) (BR)
(YE)(GY) (BR)
Refer to the illustration below and for complete wiring dia -
gram see reverse side.
LGO LIMIT SWITCH ASSY
repLACeMenT KIT
K74-16420
For more information, please visit www.devancocanada.com or call toll free at 855-931-3334

HOW TO ORDER
REPAIR PARTS
DEVANCO CANADA
19192 HAY ROAD, UNIT Q
SUMMERSTOWN, ON K0C 2E0
TOLL FREE: 855-931-3334
www.devancocanada.com
WHEN ORDERING REPAIR PARTS
PLEASE SUPPLY THE
FOLLOWING INFORMATION:
3PART NUMBER
3DESCRIPTION
3MODEL NUMBER