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Installation and Operation 

DTR-51 & DTR-61 Ringdown Telephones 

 

 

Page 14 

 

 

 

Warranty 

Guardian Telecom, a division of Circa Enterprises Inc. warrants that its products are free from defective 

workmanship and materials. Guardian Telecom will, within three years from the date of final sale to the 

customer, replace or repair any such products provided they are returned to our facilities for examination. 

Freight costs (including brokerage if applicable), both to and from Guardian, are the sole responsibility of the 

customer. This warranty does not extend to any items that are deemed to have been misused, modified, 

neglected, improperly specified, improperly installed, or used in violation of instructions or specifications 

approved by Guardian Telecom. Guardian Telecom, a division of Circa Enterprises Inc. shall not be liable for 

incidental or consequential damage of any kind caused by any defect in our product. The total liability shall 

not, under any circumstances, exceed the purchase price of the products furnished by Guardian Telecom, a 

division of Circa Enterprises Inc.

 

A return authorization must be obtained prior to warranty claims or repairs.

 

Disclaimer 

The products covered by this manual are designed for use in Industrial Environments and/or 

Hazardous Locations. Due to the range of possible applications for these instruments, the 

manufacturer will not be responsible for damages or losses of any kind suffered as a result of the 

use of this product, including consequential damages. 

Warning 

This device may be opened and reassembled by qualified personnel only, for the purposes of 

installing the product, making adjustments and replacing components, following the instructions in 

the product manual. Before opening this telephone, disconnect the wiring at the demarcation block. 

 

High voltages may be present in this product when connected to telephone wiring. 

 

Service Telephone Number 

1-800-363-8010 

Guardian Telecom provides a customer service telephone number, which is toll-free within North 

America. If you need assistance when installing or operating this product

please call the toll-free 

telephone number between regular business hours (8:00AM-5:00PM), Mountain Standard Time. If 

you are calling outside of regular business hours, please leave a detailed message, and a member 

of Guardian Telecom’s Service Department will return your call as soon as possible. If your product 

requires service, Guardian personnel will supply you with an RMA (return materials authorization) 

number over the telephone or through our web site product return page. This number must be 

included with your return address and the name of the person to contact. 

 

Guardian Telecom, a division of Circa Enterprises Inc. 

Toll-free 1-800-363-8010 

Ph.  (403) 258-3100 

Fax. (403) 255-2595 

www.guardiantelecom.com

 

Feedback 

Guardian Telecom continually strives to make reliable, durable, and easy to use products. If you, as 

an installer or user of our equipment, have any suggestions for improvements to this or any of our 

products or documents, including this manual, we would appreciate hearing from you. 

 

 

 

Summary of Contents for DTR-51

Page 1: ...DTR 51 DTR 61 Ringdown Telephones Installation Operation P007118 Rev D 200617 6 17 2020 11 26 AM...

Page 2: ...such products software firmware and or hardware Guardian Telecom reserves the right to make changes without notice to this manual and to any such product software firmware and or hardware OPEN SOURCE...

Page 3: ...Guardian Telephones 16 Storage 16 Table of Figures Figure 1 Features 5 Figure 2 Overall Dimensions 5 Figure 3 Wall Installation of Base 6 Figure 4 Wiring 6 Figure 5 Temporary Mounting for Wiring 8 Fig...

Page 4: ...tive Mounting desk top or wall mounted Audio Modes handset Resettable Fuse prevents damage to the electronic circuits in the event of a high voltage spike on the telephone line Magnetic Reed Hook Swit...

Page 5: ...Installation and Operation DTR 51 DTR 61 Ringdown Telephones Page 5 Figure 1 Features Figure 2 Overall Dimensions...

Page 6: ...Installation and Operation DTR 51 DTR 61 Ringdown Telephones Page 6 Figure 3 Wall Installation of Base Figure 4 Wiring...

Page 7: ...Top Configuration If the telephone is to be desktop mounted set the base in the desired location Wall Mount Configuration If the telephone is to be wall mounted choose a location that is free of obst...

Page 8: ...an extension telephone is installed the phone line out terminals may be utilized A four conductor cable can be used or an additional cable can be run through the spare 20mm opening if it is not occupi...

Page 9: ...lose the O ring retainers Install the options following the instructions below Tighten cable glands securely Carefully replace the front plate and install all four screws Tip Torque screws to 1 65 ft...

Page 10: ...g screw retainers See Figure 5 Temporary Mounting for Wiring Perform the necessary repairs or adjustments Carefully replace the front plate and install all four screws Tip Torque screws to 1 65 ft lbs...

Page 11: ...rips repeatedly check the telephone system wiring The fuse protects the Tip and Ring line from the telephone system It is usually powered at 48 volts DC and must not be connected to 120VAC or 230VAC T...

Page 12: ...CONNECTION METHOD TERMINAL BLOCKS FUSE MAIN TELEPHONE CIRCUIT 250 mA AUTO RESET FUSE RING DETECT RELAY 5 AMP 250 VOLT FAST BLOW ENVIRONMENTAL INGRESS PROTECTION RATING IP66 OPERATING TEMPERATURE 30O...

Page 13: ...for hook switch Yes P006614 Handset retainer Yes P006617 Allen key for faceplate screws Yes P006656 Receiver cartridge No P006668 M20 Plug Yes P006679 M12 Gland Yes P006687 Switch Volume Control Hand...

Page 14: ...he use of this product including consequential damages Warning This device may be opened and reassembled by qualified personnel only for the purposes of installing the product making adjustments and r...

Page 15: ...tain authorization to return the product This can be done by completing an RMA form online at https www guardiantelecom com support rma or by calling the service telephone number given in this manual...

Page 16: ...pyl alcohol may be used applied with a cloth Avoid using alcohol on silicon based keypads since doing so may significantly degrade legibility Do not use furniture polishes waxes or plasticizer based c...

Page 17: ...Installation and Operation DTR 51 DTR 61 Ringdown Telephones Page 17 Notes Model No Part No Serial No Date of Purchase...

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Page 20: ...vision of Circa Enterprises Inc Toll free 1 800 363 8010 Phone 403 258 3100 Fax 403 255 2595 www guardiantelecom com E mail sales guardiantelecom com CTRL Click to open message box Tough Trusted True...

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