ITL MKR-S750-0DH Service manual

Toll Free: [phone] www.itl-llc.com
Installation
Instruction Manual
MKR-S750-0DH
MKR-D750-000
Single & Double
Red Incandescent
Obstruction Lights

MKR-S750-0DH / MKR-D750-000
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Front Matter
Copyright & Trademarks
Copyright © 2004 - 2020 by ITL, LLC. All rights reserved. This document contains
proprietary information, photographs, graphics, and other material (collectively, "the
Content") protected by copyright, and this manual and all accompanying hardware,
software and documentation are copyrighted. No part of this document may be
photocopied or reproduced by mechanical, electronic, or other means in any form without
written consent of ITL, LLC.
ITL, LLC, MKR-S750-0DH & MKR-D750-000 and the ITL logo are trademarks of ITL,
LLC. All other trademarks and brand names are the property of their respective
proprietors.
Limited Warranty and Disclaimer
ITL, LLC guarantees that every MKR-S750-0DH & MKR-D750-000 obstruction light is
free from physical defects of material and workmanship under normal use for two (2) year
from the date of purchase. If the product proves defective during this warranty period,
please contact ITL, LLC in order to obtain a Return Authorization Number, RMA.
In no event shall ITL, LLC’s liability exceed the price paid for the product from direct,
indirect, special, incidental, or consequential damages resulting from the use of the
product, its accompanying software, or its documentation. ITL, LLC makes no warranty
or representation, expressed, implied, or statutory, with respect to its products or the
contents or use of this documentation and all accompanying software, and specifically
disclaims its quality, performance, merchantability, or fitness for any particular purpose
unless otherwise stated.
The technical documentation is being delivered to you AS-IS. ITL, LLC makes no
warranty as to its accuracy or use. Any use of the technical documentation or the
information contained therein is at the risk of the user. Documentation may include
technical or other inaccuracies or typographical errors. ITL, LLC reserves the right to
revise or update its products, software, or documentation without obligation to notify any
individual or entity.
Please send any comments regarding the manual to [email protected].
Safety Warning
This equipment uses lethal voltage which can cause serious injury and/or death.
Do not attempt to service this equipment with line power applied.
Do not rely on interlock switches; remove lethal voltages from the system.
Measure for voltages using a voltmeter to ensure that power is off and has been
completely removed.
Do not wear any jewelry. Gold and silver are excellent conductors of electricity.

MKR-S750-0DH / MKR-D750-000
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Table of Contents
The fastest way to find a specific topic is to use the detailed index in the back of the
manual.
Front Matter ....................................................................................................................... 2
Copyright & Trademarks ................................................................................................ 2
Limited Warranty and Disclaimer ................................................................................... 2
Safety Warning .............................................................................................................. 2
Introduction ........................................................................................................................ 4
Product Description ........................................................................................................... 4
Specifications .................................................................................................................... 5
Environment ................................................................................................................... 5
Mechanical ..................................................................................................................... 5
MKR-S750-0DH (Single) ............................................................................................... 5
MKR-D750-000 (Double) .............................................................................................. 5
Electrical ........................................................................................................................ 5
Lamps ............................................................................................................................ 5
Mounting: ....................................................................................................................... 5
Installation ......................................................................................................................... 6
Unpacking your Obstruction Light .................................................................................. 6
Tools for Installation ....................................................................................................... 6
Quick Installation ............................................................................................................ 6
Installation Wiring Diagram ............................................................................................ 6
Parts Locator (MKR-S750-0DH) ........................................................................................ 7
Parts Locator (MKR-D750-000) ......................................................................................... 7
Replacement Parts ............................................................................................................ 8
Technical Support and Contact Info .................................................................................. 8
Contact Info ................................................................................................................... 8
RMA ............................................................................................................................... 8

MKR-S750-0DH / MKR-D750-000
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Introduction
Congratulations, and thank you for choosing an ITL L-810 red obstruction light.
The ITL, LLC L-810 red obstruction light has been tested for compliance with applicable
FAA specifications for marking hazards to air navigation such as towers, smoke stacks or
similar structures. It is intended for installations which require FAA L-810 red lights.
Included in this manual are list of specifications, electrical connection diagram, bill of
material and contact information.
Product Description
The MKR-S750-0DH Single Obstruction Light and MKR-D750-000 Double Obstruction
Light have been tested for compliance with applicable FAA specifications for marking
hazards to air navigation such as towers, smoke stacks or similar structures. It is
intended for installations which require FAA L-810 red lights.
MKR-D750-000
Double Obstruction Light
MKR-S750-0DH
Single Obstruction Light

MKR-S750-0DH / MKR-D750-000
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Specifications
Complies with FAA AC150/5345-43, Type L-810
Environment
Temperature -40ºC to +55ºC
Humidity less than 95% relative humidity (non-
condensing)
Mechanical
MKR-S750-0DH (Single)
Dimension Height: 8.5” (21.6 cm)
Width: 6” (15.3cm)
Weight 3 lbs (1.4 Kg) max
MKR-D750-000 (Double)
Dimension Height: 8.5” (21.6 cm)
Width: 11.5” (29.2cm)
Length: 6” (15.3cm)
Weight 10 lbs (4.5Kg) max
Electrical
Input Power 120VAC 50/60Hz
(240 Vac version available)
Lamps
116W, 120 Vac
(Lamps sold separately)
Mounting: 3/4 inch conduit entrance (bottom)

MKR-S750-0DH / MKR-D750-000
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Installation
The following section describes how to install the obstruction light. Please refer to the
appropriate wiring diagram below.
Unpacking your Obstruction Light
Please examine the shipping containers and their content thoroughly upon receipt and
report any potential shipping damage to the carrier.
Tools for Installation
The following tools are suggested for mounting of the obstruction lights.
 Digital multi-meter capable of reading 600VAC/DC (Fluke 177 or 179)
 Nut Drivers and Sockets
 #2 Phillips Screwdriver
 5/16 Flat Head screwdriver
 Crimp Tool
 Needle Nose Pliers
Quick Installation
The MKR-S750-0DH (L-810) single obstruction light has ¾ inch NPT side and
bottom hubs available for mounting. The L-810 must be leveled during installation for
correct vertical beam alignment.
The MKR-D750-000 (L-810) double obstruction light has a ¾ inch NPT bottom hub
available for mounting. The L-810 double obstruction light must be leveled during
installation for correct vertical beam alignment.
Installation Wiring Diagram
Sample connections for typical obstruction lights are shown in the diagrams below.
MKR-S750-0DH Single and MKR-D750-000 Double Obstruction Wiring Diagram
It is the responsibility of the installer to comply with all applicable local, state,
and federal regulations for installation and operation of this device.

MKR-S750-0DH / MKR-D750-000
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Parts Locator (MKR-S750-0DH)
Parts Locator (MKR-D750-000)

MKR-S750-0DH / MKR-D750-000
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Replacement Parts
Technical Support and Contact Info
Contact Info
For information on the MKR-S750-0DH / MKR-D750-000 obstruction lights’ basic
functions, refer to this manual and the accompanying drawings. For additional help with
the installation or operation of any ITL products, please contact ITL, LLC at one of the
following below.
Web and Internet Sites
Corporate home page: http://www.itl-llc.com
Customer Support Technicians
(8:00 AM - 5:00 PM Central Time)
US and Canada call: [phone]
Toll Free: [phone]
Email: [email protected]
RMA
Please contact ITL, LLC before returning equipment for repair and obtain a Return
Material Authorization (RMA) number.
ITL Order P/N Description
LMP-X750-000 RED FRESNEL LENS
MKR-S750-GSK GASKET
MKR-120V-SKT PORCELAIN SOCKET
LMP-116W-120 LAMP, 120VAC / 116W
Revision Description of Change Date Preparer / Approval
2 Update cover sheet, Combined manuals for
MKR-S750-0DH & MKR-D750-000 into one manual.
6/26/2012 Prepared By: Elke Hinson
Approved By: Andy Rudolph
3 Update Single & Double Marker Parts Locator
Drawings
4/04/2013 Prepared By: Elke Hinson
Approved By: Andy Rudolph
4 Update Electrical Power 4/26/2013 Prepared By: Elke Hinson
Approved By: Andy Rudolph
5 Update FAA Specification revision from F to G, add
note in electrical power “240 Vac version available”
4/26/2013 Prepared By: Elke Hinson
Approved By: Andy Rudolph
5 Update from “ETL Certified to” to “Complies with” 3/30/2020 Prepared By: Elke Hinson
Approved By: Andy Rudolph