42004-165E

42004-165E
Pub. 42004-165E
GAI-TRONICS® CORPORATION
A HUBBELL COMPANY
Model 305-001 Line Balance Assembly
Confidentiality Notice
This manual is provided solely as an operational, installation, and maintenance guide and contains
sensitive business and technical information that is confidential and proprietary to GAI-Tronics. GAITronics retains all intellectual property and other rights in or to the information contained herein, and
such information may only be used in connection with the operation of your GAI-Tronics’ product or
system. This manual may not be disclosed in any form, in whole or in part, directly or indirectly, to any
third party.
General Information
The GAI-Tronics Model 305-001 Line Balance Assembly has been designed to properly load both page
and party line circuits of a GAI-Tronics communication system. At least one line balance assembly must
be installed in each system. The Model 305-001 Line Balance Assembly can be used in single or multiple
(up to five) party line systems.
Installation
Location
There are three primary considerations in determining the location of the line balance assembly:
1. It should be near the electrical center of the system;
2. It should be adjacent to an indoor station in a relatively quiet area;
3. It should be no more than 5,280 feet (1600 m) from the most distant station, when used with standard
GAI-Tronics cable.
For larger systems or when non-standard cable is to be used, please contact a GAI-Tronics representative
for further information. The line balance assembly has one electrical adjustment that must be made while
using a station. See the “Line Balance Assembly Adjustment” section.
Mounting
Mounting can be accomplished by either suspending the line balance assembly by a one-inch conduit
nipple (not supplied) from the lower side of an indoor wall station, or by using the mounting ears located
on the box.
Wiring
Use one twisted pair for the page circuit and one similar pair for each party line to connect the terminal
blocks of the line balance assembly and the associated indoor wall station.
GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA
610-777-1374  800-492-1212  Fax: 610-796-5954
VISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
Model 305-001 Line Balance Assembly
Pub. 42004-165E
Page 2 of 2
Figure 1. Line balance assembly terminal block connections
Line Balance Assembly Adjustment
1. Remove the line balance assembly cover to expose the line balance control.
2. To set the control for proper page circuit loading, lift the handset from the adjacent handset station
and press the push-to-page button. From a normal speaking distance (approximately 1/2 inch), blow
steadily into the handset microphone and adjust the control to minimize receiver sidetone.
(Sidetone is the amount of signal transmitted from the microphone of a handset to the ear piece, i.e.,
how loudly the speaker hears their own voice.)
NOTE: This adjustment needs to be made only at the initial installation of a system. However, if
more than 10 speaker amplifiers are added or deleted, repeat the adjustment of page circuit loading.
3. After final adjustment, replace the cover and secure with four mounting screws to discourage
tampering by unauthorized personnel and prevent entry of contaminants.
For more detailed system installation information, please refer to GAI-Tronics Pub. 42004-139 for 700
Series 120 V ac systems, or Pub. 42004-140 for 700 Series 24 V dc systems.
Specifications
Wiring ..................................................... The assembly contains a barrier-type terminal strip to which field
wiring connections are made to page and party line circuits.
Mounting ................................................. Mounting lugs or supported by a 1-inch conduit nipple connected
between the conduit hub and the handset station.
Enclosure ................................... Cast aluminum two-gang outlet box with cast, dust-tight aluminum cover
Control ......................................................................... Line balance control is provided for the page circuit
Finish .............................................................................................................................. Aluminum or epoxy
Dimensions ................................................... 5.30 H  4.60 W  2.25 D inches (134.6  116.8  57.2 mm)
Shipping weight ....................................................................................................................... 2 lbs. (0.9 kg)
Approvals
NRTL Listed for USA and Canada ......................................................... Class I, Div. 2, Groups A, B, C, D;
Class II, Div. 2, Groups F and G; Class III, Div. 2
CE Mark
f:\standard ioms - current release\42004 instr. manuals\42004-165e.doc
04/13
Warranty
Equipment.
GAI-Tronics warrants for a period of one (1) year from the date of shipment, that any
GAI-Tronics equipment supplied hereunder shall be free of defects in material and workmanship, shall
comply with the then-current product specifications and product literature, and if applicable, shall be fit
for the purpose specified in the agreed upon quotation or proposal document. If (a) Seller’s goods prove
to be defective in workmanship and/or material under normal and proper usage, or unfit for the purpose
specified and agreed upon, and (b) Buyer’s claim is made within the warranty period set forth above,
Buyer may return such goods to GAI-Tronics nearest depot repair facility, freight prepaid, at which time
they will be repaired or replaced, at Seller’s option, without charge to Buyer. Repair or replacement shall
be Buyer’s sole and exclusive remedy. The warranty period on any repaired or replacement equipment
shall be the greater of the ninety (90) day repair warranty or one (1) year from the date the original
equipment was shipped. In no event shall GAI-Tronics warranty obligations with respect to equipment
exceed 100% of the total cost of the equipment supplied hereunder. Buyer may also be entitled to the
manufacturer’s warranty on any third-party goods supplied by GAI-Tronics hereunder. The applicability
of any such third-party warranty will be determined by GAI-Tronics.
Services.
Any services GAI-Tronics provides hereunder, whether directly or through subcontractors,
shall be performed in accordance with the standard of care with which such services are normally
provided in the industry. If the services fail to meet the applicable industry standard, GAI-Tronics will reperform such services at no cost to buyer to correct said deficiency to Company's satisfaction provided
any and all issues are identified prior to the demobilization of the Contractor's personnel from the work
site. Re-performance of services shall be Buyer's sole and exclusive remedy, and in no event shall GAITronics warranty obligations with respect to services exceed 100% of the total cost of the services
provided hereunder.
Warranty Periods.
Every claim by Buyer alleging a defect in the goods and/or services provided
hereunder shall be deemed waived unless such claim is made in writing within the applicable warranty
periods as set forth above. Provided, however, that if the defect complained of is latent and not
discoverable within the above warranty periods, every claim arising on account of such latent defect shall
be deemed waived unless it is made in writing within a reasonable time after such latent defect is or
should have been discovered by Buyer.
Limitations / Exclusions.
The warranties herein shall not apply to, and GAI-Tronics shall not be
responsible for, any damage to the goods or failure of the services supplied hereunder, to the extent
caused by Buyer’s neglect, failure to follow operational and maintenance procedures provided with the
equipment, or the use of technicians not specifically authorized by GAI-Tronics to maintain or service the
equipment. THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE IN LIEU OF AND
EXCLUDE ALL OTHER WARRANTIES AND REMEDIES, WHETHER EXPRESS OR IMPLIED BY
OPERATION OF LAW OR OTHERWISE, INCLUDING ANY WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Return Policy
If the equipment requires service, contact your Regional Service Center for a return authorization number
(RA#). Equipment should be shipped prepaid to GAI-Tronics with a return authorization number and a
purchase order number. If the equipment is under warranty, repairs or a replacement will be made in
accordance with the warranty policy set forth above. Please include a written explanation of all defects to
assist our technicians in their troubleshooting efforts.
Call 800-492-1212 (inside the USA) or 610-777-1374 (outside the USA) for help identifying the
Regional Service Center closest to you.
(Rev. 10/06)
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