Guardian Telecom DTR-51 Guide

DTR-51 & DTR-61 Ringdown Telephones
Installation & Operation
P007118 Rev. D 200617 6/17/2020 11:26 AM

Installation and Operation
DTR-51 & DTR-61 Ringdown Telephones
Page 2
DTR-51/61 P007118 Rev. D
COPYRIGHT NOTICE:
© 2020, Guardian Telecom, ALL RIGHTS RESERVED.
This manual and related material is the copyrighted property of Guardian Telecom No part of this
manual or related materials may be reproduced or transmitted, in any form or by any means (except for
internal use by licensed customers), without prior express written permission of Guardian Telecom.
This manual, and the products, software, firmware, and/or hardware described in this manual are the
property of Guardian Telecom provided under the terms of an agreement between Guardian Telecom
and the recipient of this manual, and their use is subject to that agreement and its terms.
DISCLAIMER: Except as expressly and specifically stated in a written agreement executed by
Guardian Telecom, Guardian Telecom makes no representation or warranty, express or implied,
including any warranty or merchantability or fitness for any purpose, with respect to this manual or the
products, software, firmware, and/or hardware described herein. Guardian Telecom assumes no liability
for damages or claims resulting from any use of this manual or 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 STATEMENT: Certain software components included in Guardian products are
subject to the GNU General Public License (GPL) and Lesser GNU General Public License (LGPL)
“open source” or “free software” licenses. Some of this Open Source Software may be owned by third
parties. Open Source Software is not subject to the terms and conditions of the Guardian COPYRIGHT
NOTICE or software licenses. Your right to copy, modify, and distribute any Open Source Software is
determined by the terms of the GPL, LGPL, or third party, according to who licenses that software.
Software or firmware provided by Guardian that is unrelated to Open Source Software is copyrighted by
Guardian, subject to the terms of Guardian licenses, and may not be copied, modified, reverse-
engineered, or otherwise altered without explicit written permission from Guardian Telecom.
TRADEMARK NOTICE: Guardian Telecom and the Guardian Telecom logos are trademarks of
Guardian Telecom Other product names, trademarks, and service marks may be the trademarks or
registered trademarks of their respective owners.
Toll-free 1-800-363-8010
Phone [phone]
Fax. [phone]
www.guardiantelecom.com
E-mail: [email protected]

Installation and Operation
DTR-51 & DTR-61 Ringdown Telephones
Page 3
Table of Contents
Package Contents............................................................................... 3
Models ................................................................................................ 3
Accessories ........................................................................................ 3
Overview............................................................................................. 4
Features.............................................................................................. 4
Installation........................................................................................... 7
Wiring ................................................................................................. 8
Retrofitting Strobe Light/ Ringer .......................................................... 9
Field Repairs & Adjustments ............................................................. 10
Operating the DTR............................................................................ 11
Specifications.................................................................................... 12
Replacement Parts ........................................................................... 13
Warranty ........................................................................................... 14
Disclaimer ......................................................................................... 14
Warning ............................................................................................ 14
Service Telephone Number............................................................... 14
Feedback .......................................................................................... 14
Guardian Product Return .................................................................. 15
Cleaning Tips for 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
Figure 6 - Replacing Hook Switch ..................................................... 10
Package Contents
(1) DTR-51 or DTR-61 Ringdown Telephone
(1) Installation & Operation Manual
(1) Parts bag containing handset clips & screws, 3mm Allen key for faceplate screws &
one Ring Detect Relay Enable jumper wire.
Models
P3029
DTR-51 – Ringdown with Volume Control Handset & Coil Cord
P3030
DTR-61 – Ringdown with Volume Control Handset & Armored Cord
Accessories
Headset assembly – contact Guardian sales.

Installation and Operation
DTR-51 & DTR-61 Ringdown Telephones
Page 4
Overview
DTR Ringdown Telephones
DTR ringdown telephones provide safe, reliable communications in areas that are prone to high
humidity, chemical vapors, dust and physical abuse. A Headset option is available to improve speech
recognition in noisy environments.
Features
Housing and Handset
•
high impact thermoset – static dissipative
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 Switch
•
no moving parts
Built In Ring Detect Relay
•
250VAC 5 Ampere Ring Detect Relay, (no need for an external RDR)
Handset Cord
•
4' heavy duty Coil cord on DTR-51
•
armored cord on DTR-61
Hearing-Aid Compatible (HAC) Receiver
•
compatible with inductively coupled hearing-aid devices
Receiver Volume Control
•
Switch in handset provides 15dB of audio range
Wide Temperature Range
•
-30º C to +60º C (-22º F to +140º F)

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

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

Installation and Operation
DTR-51 & DTR-61 Ringdown Telephones
Page 7
Installation
•The DTR is a ringdown telephone that utilizes the features of the PABX to route
calls to the desired location.
•
Follow all appropriate electrical codes and use only approved electrical fittings for
the installation.
•
If required install primary surge protection external to the telephone.
•The telephone may be installed on a flat surface or wall mounted.
•Ensure that none of the electrical connection circuits are live by disconnecting the
Tip and Ring conductors at the demarcation block or PABX.
• If the built in Ring Detect Relay is to be utilized to activate an external alarm,
ensure that the power conductors are not live.
•Using the 3mm Allen Key provided loosen the four faceplate captive screws to
detach the faceplate from the base.
Desk 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
obstructions and permits space for wiring. Mount the base with the deepest
dimension on the bottom. Mount as follows:
See: Figure 2 - Overall
Dimensions.
oThe telephone weighs 3.95 kilograms (8.68 pounds), ensure that the
mounting can support four times the weight of the unit; that is 15.8
kilograms (34.8 pounds). Wall anchors are not included; follow the
manufacturer's instructions when installing anchors.
oMounting to concrete or cinder block. Lead expansion anchors with M4
(#8) screws are recommended.
oMounting to drywall. Hollow wall anchors (Molly Bolts) with M4 (#8)
screws are recommended.
oMounting to other surfaces. It is the responsibility of the installer to ensure
that the base is attached in such a way as to support the weight specified
above.
•Install the handset retainer clips on the faceplate using the hardware supplied.

Installation and Operation
DTR-51 & DTR-61 Ringdown Telephones
Page 8
Wiring
•
WARNING: Use properly sized cable to ensure a gas/dust tight seal at
the cable gland to maintain an IP66 rating, (M12 – 2 to 5mm),
(M20 – 8 to 13mm). Take care not to lose parts of the gland if the cap is
removed.
Tip: If cable diameter is
not in the range of the
M12 or M20 glands
provided an approved
reducer and smaller
gland can be fitted.
See: Figure 5 -
Temporary Mounting for
Wiring
•If the telephone is wall mounted temporarily, hang the faceplate on the right
side of the base using two of the faceplate screws. Be careful not to lose the
"O" ring screw retainers.
• Insert the Tip and Ring cable through the M20 gland and connect the
conductors to the Phone-Line-In terminal block.
•If 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 occupied for other
purposes.
See: Figure 4 - Wiring
• If an external alerter device is utilized, remove the M20 plug, install an
appropriate cable gland and connect the wiring to the Ring Detect Relay
terminal block. Enable the Ring Detect Relay by inserting the jumper wire
provided across the Ring Detect Relay Enable terminals.
•Tighten the cable glands securely.
•Mount the faceplate and secure the captive screws to the base.
Tip: Torque screws to
1.65 ft/lbs (1.36Nm)
•
Connect the Tip and Ring conductors at the demarcation block.
• If the built in Ring Detect Relay is utilized, apply power to the conductors.
Programming
•
Program the PABX if necessary.
Testing
• Test the unit by calling to and from another unit on the exchange.
Figure 5 - Temporary Mounting for Wiring

Installation and Operation
DTR-51 & DTR-61 Ringdown Telephones
Page 9
Retrofitting Strobe Light/ Ringer
•
Disconnect wiring at the demarcation block and power breaker to avoid shock
hazard.
See: Figure 5 -
Temporary Mounting
for Wiring
•Loosen the four captive screws in the faceplate and detach the faceplate from
the base.
•
If the telephone is wall mounted, temporarily hang the faceplate to the right side
of the base using two of the faceplate screws. Be careful not to 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/lbs (1.36Nm).
•
Reconnect telephone and ring detect relay wiring.
•Test the unit by calling to and from another unit on the exchange.
Strobe Light /Loud Ringer
•
Remove the M20 alerter device wiring plug from the base and install an M20
cable gland.
See:
Figure 1 - Features
•Connect the Strobe Light or Loud Ringer wiring to the Ring Detect Relay
terminal block.
•Enable the Ring Detect Relay by inserting the provided jumper wire across the
Ring Detect Relay Enable terminals.

Installation and Operation
DTR-51 & DTR-61 Ringdown Telephones
Page 10
Field Repairs & Adjustments
Field repairs may only be carried out by qualified technicians using OEM parts.
Substitution of parts voids warranty and may pose a hazard to users of the
equipment.
See: Replacement Parts
•Disconnect telephone wiring at the demarcation block and ring detect relay
power at the breaker to avoid shock hazard.
•
Loosen the four captive screws in the faceplate and detach the faceplate
from the base.
•If the telephone is wall mounted, temporarily hang the faceplate to the right
side of the base using two of the faceplate screws. Be careful not to lose the
"O" ring 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 (1.36Nm)
•Reconnect telephone and ring detect relay wiring.
Handset Replacement
•Disconnect the handset wiring from the terminal block.
•If the phone is equipped with an armored cord handset, remove the
anchor screw from the armored cord lanyard.
•
Loosen the handset cable gland and pull out the cord.
•
Install the new replacement handset and tighten the gland.
•Rewire the handset cord to the terminal block.
Magnetic Reed Hook Switch Replacement
•
Unplug the Hook Switch Connector.
See: Figure 6 -
Replacing Hook Switch
•
Remove the screw that secures the nylon retainer.
•
Replace the hook switch core with new one and re-secure/connect.
Figure 6 - Replacing Hook Switch

Installation and Operation
DTR-51 & DTR-61 Ringdown Telephones
Page 11
Fuses
•There are no replaceable fuses in the DTR.
•
The phone line fuse on the circuit board of all models is of the resettable
type and is not replaceable. If the fuse trips due to an external event it will
reset in a short period of time. The duration will depend on ambient
temperature and other factors. If the fuse trips 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.
•The Ring Detect Relay fuse is a 5 Ampere, fast blow fuse. It is potted to
prevent an exposed spark. If the fuse blows, the circuit board must be
replaced.
Operating the DTR
Lift the handset and the telephone will dial automatically. Adjust the handset
volume to a comfortable level with the volume control switches on the handset.
When the call is completed replace the handset in the cradle.

Installation and Operation
DTR-51 & DTR-61 Ringdown Telephones
Page 12
Specifications
PERFORMANCE
AUDIBLE RANGE FREQUENCY RESPONSE
300 –3400 HZ
RECEIVER VOLUME ADJUSTMENT
8STEPS,2 dB/STEP
CONFORMS TO
R
ESIDENTIAL
A
ND
I
NDUSTRIAL
A
REAS
ETSI TBR 38: MAY 1998 (ACOUSTICS)
ETSI TBR 21: JANUARY 1998 (TELEPHONE NETWORK)
RINGER OUTPUT
>85 dB @1M
R
INGER
I
MPEDANCE
W
ITHOUT
R
ING
D
ETECT
R
ELAY
>7K
O
HMS
@25
H
Z
,
30-90
VAC
>4K OHMS @50HZ,30-90 VAC
R
INGER
I
MPEDANCE
W
ITH
R
ING
D
ETECT
R
ELAY
>4K
O
HMS
@25
H
Z
,
30-90
VAC
(RDR NOT RECOMMENDED @50HZ)
SET IMPEDANCE
600 OHMS NOMINAL
MAXIMUM LOOP
15,000 FT (4,600 M)OF 22 AWG COPPER
ELECTRICAL
RINGER SENSITIVITY
40 –100 V, 16 –25 HZ
LINE VOLTAGE
24 –56 VDC
LOOP CURRENT
22 -100 mA
CONNECTION METHOD
TERMINAL BLOCKS
FUSE -MAIN TELEPHONE CIRCUIT
250 mA –AUTO RESET
FUSE –RING DETECT RELAY
5AMP 250 VOLT FAST BLOW
ENVIRONMENTAL
INGRESS PROTECTION RATING
IP66
OPERATING TEMPERATURE
-30
O
TO +60
O
C(-22
O
TO +140
O
F)
STORAGE TEMPERATURE
-50
O
TO +80
O
C(-58
O
TO +176
O
F)
HUMIDITY
0TO 95% RH
DUSTPROOF
FULLY GASKETTED ENCLOSURE
MECHANICAL
HOOK SWITCH (CRADLE SWITCH)LIFE
>1 000 000 OPERATIONS
HOUSING MATERIAL
GLASS FILLED POLYESTER (CARBON LOADED)
HANDSET MATERIAL
GLASS FILLED POLYESTER (CARBON LOADED)
DIMENSIONS (H X WX D) WALL MOUNTED
291 X 241X 139 MM (11.5X 9.5X 5.5 INCHES)
NET WEIGHT
3.95 KG (8.68 LBS)
SHIPPING DIMENSIONS
407 X 267 X 242 MM (16 X 10.5 X 9.5 INCHES)
SHIPPING WEIGHT
4.8
KG
(10.5
LBS
)
MOUNTING WALL STRENGTH REQUIREMENT
15.8 KG (34.8)LBS
MICROPHONE
NOISE CANCELING
RECEIVER
HEARING AID COMPATIBLE (HAC)
MOUNTING
DESK OR WALL
WIRING ACCESS
2X M20 CABLE GLAND ENTRY POINTS

Installation and Operation
DTR-51 & DTR-61 Ringdown Telephones
Page 13
Compliance
60950-1, TBR-21, TBR-38
ENVIRONMENTAL
IP-66
ROHS COMPLIANT
UV COMPLIANT
UL 94V0 FLAME COMPLIANT
Replacement Parts
Part No.
Description
Field Replaceable
P001462
0-Ring for faceplate screws (4 required)
Yes
P002254
Magnetic reed hook switch
Yes
P004123
Nylon fastener 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 Handset
No
P006690
M20 Gland
Yes
P006819
Ringer Speaker
No
P006862
M12 Plug
Yes
P007013
Microphone cartridge
No
P007198
PCBA, Main circuit board
No
P007693
DTR faceplate
No
P007694
Telephone housing base with gasket molded in
Yes
P007738
Handset with coil cord
Yes
P007741
M4 Faceplate screws (4 required)
Yes
P007744
Handset with armored cord
Yes

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. [phone]
Fax. [phone]
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.

Installation and Operation
DTR-51 & DTR-61 Ringdown Telephones
Page 15
Guardian Product Return
Guardian products have been quality tested and are in full working order when shipped from
the factory, given the rugged nature of these products shipping is not expected to damage a
unit. In the unlikely event of a malfunction, Guardian follows the three-step procedure below.
Step I - On-Site Correction
•The most common source of difficulties with a new product is improper installation in one of
two ways: incorrect wiring connections or connection to an incorrect power source.
• Product wiring needs to be properly connected to the on-site wiring. Correct wiring
instructions are shown in the user manual included with the product.
• Connecting a telephone to a standard power source, rather than tip & ring, will trip the
telephone’s internal resettable fuse. In the event that the fuse trips, disconnect the
telephone from the power source and reconnect following the wiring diagrams provided
with the product.
Step II - Return Materials Authorization (RMA)
•When a product has been installed following user manual instructions and the unit
fails to operate, the user must contact Guardian Telecom to obtain 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.
• After providing information on the product, the owner and the nature of the problem,
Guardian will issue a RMA number, to be shown on documentation returned with the
product.
•In addition to the RMA number, shipping documents should include name, address and
telephone number of the owner along with contact information for the person responsible
for the repair and/or the user who identified the malfunction.
• (Where a product is being returned for repair from outside of Canada, customs
documentation must show the product’s serial number, date of export [date of purchase],
and a notation that the equipment is: “Canadian goods returning.”)
Step III - Factory Authorized Service
• Once received, each product is carefully inspected and tested. If the product is under
warranty, repairs are completed and the product returned to the owner, generally within
five working days of receipt by the factory.
•A product that has been subjected to misuse, neglect or accident or is beyond the warranty
period will be evaluated. The service department will provide the owner’s representative
with a repair cost estimate. Once approved, repairs are completed and the product
returned, generally within five working days.

Installation and Operation
DTR-51 & DTR-61 Ringdown Telephones
Page 16
Cleaning Tips for Guardian Telephones
Guardian Telephones may occasionally need to be cleaned to maintain appearance. Generally,
wiping the surface with a clean, water-dampened cloth will remove most films or residues. If the
soiling is too stubborn for plain water, a mild detergent solution may be used. Be sure to wipe
away any detergent residue with a plain water dampened cloth. The Telephone may be cleaned
with any general-purpose household glass and surface type cleaner. Do not spray the telephone
directly! Spray the cleaner on a soft cloth then wipe the surface. Pre-treated cloths such as
those used for eyeglasses or cameras may be used to clean the Telephone. Premoistened
towelettes may also be used, however, avoid those containing lanolin or aloe, as they will leave
a slippery residue. The handset and surface of the telephone may be cleaned with disinfectants
used for general cleaning in a medical environment. Isopropyl 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 cleaner (Armor All etc.)
•Do not use lanolin, aloe, glycerin or other skin care type products.
•Do not apply any solvent such as acetone, mineral spirits etc.
•Do not directly spray or immerse the handset.
Storage
General Storage (All situations):
•Note any stacking limits or warnings on packaging (if any).
•Do not store in temperatures over +80C.
•Store in original packaging if possible until needed.
Long Term Storage (> 6 Months):
•If area is air-conditioned and not subject to high changes in humidity, continue to store in
original packaging.
•If wide humidity shifts are expected, then use these steps:
oRemove product from packaging (including plastic bags) and store on shelf in open air.
oIf area is subject to a high degree of dust, to help maintain cosmetic appearance you can
cover with cloth (Do not cover with plastic or materials that will trap moisture) or clean
periodically.
oDo not store out of packaging long term where they are exposed to sunlight. Long-term
exposure to UV may cause fading on plastic parts.

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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Guardian Telecom, a division of Circa Enterprises Inc.
Toll-free 1-800-363-8010
Phone [phone]
Fax. [phone]
www.guardiantelecom.com
E-mail: [e-mail]
(CTRL + Click to open message box)
Tough. Trusted. True.
© Guardian Telecom 2020