Guardian DTT-50 Manual

7552 - 10th Street N.E. Calgary, Alberta, Canada T2E 8W1
Industrial Communications Worldwide
DTT-50 & DTT-60 Telephones
Installation & Operation
P007117 Rev. B 110314 3/16/2011 1:11 PM
Ph: 403.258.3100 \ email:[e-mail] \ www.guardiantelecom.com

Guardian Telecom Inc. Installation and Operation
DTT-50 & DTT-60 Telephones
Page 2
Table of Contents
Package Contents ........................................................................................2
Models..........................................................................................................2
Accessories ..................................................................................................2
Overview ......................................................................................................3
Features .......................................................................................................3
Installation ....................................................................................................6
Wiring ...........................................................................................................7
Retrofitting Headset/Supplemental Receiver, Strobe Light/Ringer...............8
Field Repairs & Adjustments ........................................................................9
Operating Modes and Software Features ..................................................11
Product Specifications................................................................................18
Replacement Parts.....................................................................................19
Warranty.....................................................................................................20
Disclaimer...................................................................................................20
Warning ......................................................................................................20
Service Telephone Number........................................................................20
Feedback....................................................................................................20
Guardian Product Return ...........................................................................21
Cleaning Tips for Guardian Telephones.....................................................22
Table of Figures
Figure 1 - Features................................................................................4
Figure 2 - Overall Dimensions...............................................................4
Figure 3 - Wall Installation of Base........................................................5
Figure 4 - Wiring....................................................................................5
Figure 5 - Temporary Mounting for Wiring.............................................7
Package Contents
(1) DTT-50 or DTT-60 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
P3027 DTT-50 Telephone With Curly Cord
P3028 DTT-60 Telephone With Armored Cord
Accessories
P3031 Headset Kit
P3024 Supplemental Receiver Kit

Guardian Telecom Inc. Installation and Operation
DTT-50 & DTT-60 Telephones
Page 3
Overview
DTT Telephones
DTT telephones provide safe, reliable communications in areas that are prone to high humidity,
chemical vapors, dust and physical abuse. Hands Free operation is standard on all models and the
telephones can be programmed for speed dialing. All models have the option of installing a
Supplemental receiver that can be held against the ear opposite to the handset, in order to improve
speech recognition in noisy environments. In place of a Supplemental receiver a headset providing
even greater flexibility can be installed.
Features
Housing and Handset
•high impact thermoset – static dissipative
Mounting
•desk top or wall mounted
Audio Modes
•handset and hands-free or optional headset
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
LCD Display
•for ease of user interface, multi-language capable
Built In Ring Detect Relay
•250VAC 5 Ampere Ring Detect Relay, no need for external RDR
Tone (DTMF)/Pulse Operation
•factory set to tone (DTMF) dialing
•60:40 or 66:33 pulse dialing can be ordered or configured in the field
Handset Cord
•6’ heavy duty curly cord on DTT-50
•armored cord on DTT-60
Hearing-Aid Compatible (HAC) Receiver
•compatible with inductively coupled hearing-aid devices
Receiver Volume Control
•Switch on keypad provides 15dB of audio range
Wide Temperature Range
•-30º C to +60º C (-22º F to +140º F)

Guardian Telecom Inc. Installation and Operation
DTT-50 & DTT-60 Telephones
M20 ENTRY GLAND (DESK MOUNT)*
Page 4
Figure 1 - Features
Figure 2 - Overall Dimensions
4x5 KEYPAD
LCD DISPLAY
M20 ALERTER WIRING PLUG*
MAGNETIC REED
HOOK SWITCH
GLASS REINFORCED
POLYESTER FACEPLATE
M12 HEADSET SUPPLEMENTAL
RECEIVER WIRING
COIL CORD FOR DTT-50
ARMORED CORD FOR DTT-60
* BASE IS ROTATED 180° FOR WALL MOUNT

Guardian Telecom Inc. Installation and Operation
DTT-50 & DTT-60 Telephones
Page 5
Figure 3 - Wall Installation of Base
Figure 4 - Wiring
9.2" [234mm]
8.7" [222mm]
9.4" [238mm]
7.2" [184mm]
OPTIONAL GROUNDING
VOICE PATH
SWITCHING
ADJUST
RING DETECT RELAY
CONTACTS NO POLARITY
RING DETECT RELAY
ENABLE NO POLARITY
(INSTALL SUPPLIED
JUMPER WIRE)

Guardian Telecom Inc. Installation and Operation
DTT-50 & DTT-60 Telephones
Page 6
Installation
•DTT telephones are shipped from the factory set for DTMF (Tone) dialing
mode. If loop disconnect (Pulse) dialing is required program Register Number
52 appropriately.
See: Operating Modes
and Software Features.
•Follow all appropriate electrical codes and use only approved electrical fittings
for the installation.
•If required install primary surge protection external to the telephone.
•Ensure that the telephone circuits are not live by disconnecting the Tip and
Ring conductors at the demarcation block.
•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 remove the four faceplate screws to
detach the faceplate from the base.
•The telephone may be installed on a flat surface or wall mounted.
Desk Top Configuration
•If the telephone is to be desk top 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
manufacture’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.

Guardian Telecom Inc. Installation and Operation
DTT-50 & DTT-60 Telephones
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.
•If the telephone is wall mounted hang the faceplate on the right side of the
base using two of the faceplate screws. Be careful not to lose the "O" ring
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.
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
See: Figure 4 - Wiring
•Install the supplemental receiver or headset if provided.
•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.
See: Retrofitting
Headset/Supplemental
Receiver, Strobe
Light/Ringer
•Tighten the cable glands securely.
•Mount the face plate and fasten the captive screws to the base.
•Connect the Tip and Ring conductors at the demarcation block.
Tip: Torque screws to
1.65 ft/lbs (1.36Nm)
•If the built in Ring Detect Relay is utilized apply power to the conductors.
Programming the DTT
•If necessary program the features.
Testing See: Operating Modes
and Software Features
•Test the unit by calling to and from another unit on the exchange.
Figure 5 - Temporary Mounting for Wiring
Page 7

Guardian Telecom Inc. Installation and Operation
DTT-50 & DTT-60 Telephones
Page 8
Retrofitting Headset/Supplemental Receiver, Strobe Light/Ringer
•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 face plate 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.
See: Figure 5 -
Temporary Mounting
for Wiring
•Install the options following the instructions below.
•Tighten cable glands securely.
•Carefully replace the front plate and install all four screws.
•Reconnect telephone and ring detect relay wiring.
•Test the unit by calling to and from another unit on the exchange.
Tip: Torque screws to
1.65 ft/lbs (1.36Nm).
Headset / Supplemental Receiver
•If wall mounted install the Headset/Supplemental Receiver hanger to the wall
4" to 6" to the right of the telephone.
•Remove the M12 plug on the side of the face plate and install the accessory
cord gland.
•Insert the cord through the gland until the sleeve protrudes 1 cm into the face
plate and tighten the gland securely.
Note: Headset Kit
part no. P3031 or
Supplemental
Receiver part no.
P3024 required.
See: Figure 1 -
Features
•Connect the headset wiring to the headset earpiece and microphone terminal
block or if the Supplemental Receiver is utilized connect the wiring to the
headset earpiece terminal block connector.
•If the headset is utilized program the phone to recognize the headset (Register
Number 54).
See: Figure 4 - Wiring
See: Operating
Modes and Software
Features
Strobe Light /Loud Ringer
•Remove the M20 alerter device wiring plug from the base and install a cable
gland.
•Insert the cord through the gland into the face plate or base and tighten the
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.

Guardian Telecom Inc. Installation and Operation
DTT-50 & DTT-60 Telephones
Page 9
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 retainers.
•Perform the necessary repairs or adjustments.
See: Figure 5 -
Temporary Mounting for
Wiring
•Carefully replace the front plate and install all four screws.
•Reconnect telephone and ring detect relay wiring.
Tip: Torque screws to
1.65 ft/lbs (1.36Nm).
Hands-free Speaker Phone Voice Switching Adjustment
•Locate the Voice Path Switching potentiometer. See: Figure 4 - Wiring
•Adjust the potentiometer clockwise to increase the receive sensitivity.
•Adjust the potentiometer counter-clockwise to increase the transmit
sensitivity.
Handset Replacement
•Disconnect the handset wiring from the terminal block. See: Figure 4 - Wiring
•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 and tighten the gland.
•Rewire the replacement cord to the terminal block.
Supplemental Receiver and Headset Replacement
•Disconnect the supplemental receiver/headset wiring from the terminal
block.
See: Figure 4 - Wiring
•Loosen the cable gland and pull out the cord.
•Install the new replacement and tighten the gland.
•Rewire the replacement cord to the terminal block.
Hands-free Speaker Replacement
•Unplug the speaker connector from the main board.
•Remove the screws that hold the speaker cap to get access to the
speaker.
•Install the new speaker and gasket.
•Reconnect the speaker connector to the main board.
Main Circuit Board Replacement
•Label any wiring attached to the circuit board. Disconnect wiring and
ribbon cable.
•Remove the six screws holding the circuit board in place. Carefully
remove the board.
•Install the new board and replace the six screws and wiring.
Tip: Torque screws to
2.5 in/lbs (0.28 Nm).

Guardian Telecom Inc. Installation and Operation
DTT-50 & DTT-60 Telephones
Keypad Circuit Board Replacement
•Remove the main circuit board as described above.
•Remove and replace the keypad circuit board.
•Replace the main circuit board and wiring as described above.
LCD Display and Keypad Membrane Replacement
•The LCD and the keypad membrane are not replaceable in the field. The
telephone must be returned to Guardian Telecom or an authorized
service depot for repair.
Fuses
•There are no replaceable fuses in the DTT.
•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 Ring Detect Relay fuse is a 5 Ampere, fast blow fuse potted on the
circuit board. If the fuse blows the circuit board must be replaced.
Tip: 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.
Key Functions
While Programming
..............Hands free mode
..............Puts phone in programming mode
or ...Scrolls through registers
..............Returns to main register prompt
..............Stores number in selected register
..............Returns to main register without changing contents of selected register
..............Clears selected register and switches back to main register prompt
While Operating
............. Hands free mode or returns to on-hook
or ...Scrolls through registers in Phone Book mode
or ...Volume control during conversation
..............Timed disconnect (same as Flash) for some CO or PABX functions
..............Disconnects from phone line
.............Dials number in buffer
..............Displays register 0 to 9 for quick dialing
(twice) ..Displays register 00 to 19 for phone book dialing, can scroll with arrow keys
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