Guardian WRT-20 Guide

7552 - 10th Street N.E. Calgary, Alberta, Canada T2E 8W1
Industrial Communications Worldwide
Weatherproof Industrial Telephones
WRT Series
Installation & Operation
WRT-10
WRT-40
WRT-30
WRT-20
P005418 Rev. E 090603 6/10/2009 3:31 PM
Ph: 403.258.3100 \ email:[e-mail] \ www.guardiantelecom.com

Guardian Telecom Inc.
Installation and Operation
Model WRT
Page 2
Table of Contents
Package Contents.................................................................................2
Overview...............................................................................................3
Standard Features On All Models.........................................................3
Features (Specific Models) ...................................................................4
Options Available..................................................................................4
Accessories...........................................................................................4
Installing the WRT.................................................................................7
Setting Dialing Mode.............................................................................8
Field Repairs & Adjustments.................................................................9
Programming The WRT-20 With Membrane Keypad .........................10
Operating the WRT.............................................................................10
Engineering Specifications..................................................................11
Replacement Parts..............................................................................12
Government Certification ....................................................................13
Warranty..............................................................................................14
Disclaimer ...........................................................................................14
Warning...............................................................................................14
Service Telephone Number ................................................................14
Feedback ............................................................................................14
Guardian Product Return....................................................................15
Table of Figures
Figure 1 - Features - Typical - Standard Models...................................5
Figure 2 - Overall Dimensions - Standard Models................................5
Figure 3 - Features WRT-20 with Optional Mounting Plate .................6
Figure 4 - Overall Dimensions WRT-20 with Optional Mounting Plate 6
Figure 5 - Setting Dialing Mode & Installation.......................................8
Figure 6 - Fuse Replacement................................................................9
Package Contents
(1) WRT Telephone
(1) Installation & Operation Manual

Guardian Telecom Inc.
Installation and Operation
Model WRT
Page 3
Overview
WRT Series Weather Resistant Telephones
WRT telephones are designed to provide safe, reliable communication in areas prone to high
humidity, chemical vapors, dust and physical abuse. Several variations and options are available to
suit the end user’s requirements.
Standard Features On All Models
Enclosure
•weather tight, rugged Valox®& steel
•spring loaded hinged door
Faceplate
•16 Gauge steel with wiring access to surge arrestor
Encapsulated Circuitry
•circuit boards are resistant to corrosive agents (e.g. H2S, SO2, and
NH3), and environments with high humidity
Surge Arrestor
•protects the user in the event of a high voltage spike on the telephone
line
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
Tone (DTMF) Operation
•factory set to tone (DTMF) dialing
•pulse dialing can be ordered or configured in the field
6’ Heavy Duty Handset Cord (Not Available With WRT-40)
•withstands severe use
Hearing-Aid Compatible (HAC) Receiver
•compatible with inductively coupled hearing-aid devices
Receiver Volume Control
•Switch in handset (on keypad of WRT-20), provides 13.5dB of range

Guardian Telecom Inc.
Installation and Operation
Model WRT
Page 4
Features (Specific Models)
P6072 WRT-10
•Waterproof 3 x 4 Keypad
•6’ Heavy duty handset cord
P6073 WRT-20
•Membrane Keypad With Features
weather tight
10 number memory
Redial - last number (31 digits)
Recall - obtains dial tone without hanging up handset
Flash - 600ms timed loop break
Pause - 3 second pause in programming
Mute - disables handset microphone
Softer/Louder – 2.7dB steps (+8.1dB/-5.4dB 3 steps up, 2
steps down)
•6’ Heavy duty handset cord
P6074 WRT-30
•Metal 3 x 4 Keypad
•6’ Heavy duty handset cord
P6075 WRT-40
•Metal 3 x 4 Keypad
•22” Armored Handset Cord
•Handset Retainer Clips
•Stainless Steel Mounting Plate
Options Available
Stainless Steel Mounting Plate (MP) (Standard on WRT-40)
20’ Heavy Duty Curly Cord (20C) (Only on WRT-20)
20’ Heavy Duty Curly Cord (20VC) (Only on WRT-10/30)
Noise Canceling Microphone (NC)
Grey Enclosure (GR)
Accessories
•P7224 Potted ring detect relay
•P7225 Weather Proof ring detect relay
•P7227 Potted off-hook detect relay
•P7232 Weather Proof off-hook detect relay
•PXXXX External Loud Ringer

Guardian Telecom Inc.
Installation and Operation
Model WRT
3X4 KEYPAD
(WRT-10 WATERPROOF,WRT-30
& WRT-40 METAL)
MAGNETIC REED HOOK SWITCH
Page 5
HEAVY DUTY HANDSET CORD
WIRING ACCESS PLATE
VELCRO DOOR LATCH
ID & APPROVALS
FACEPLATE - 16 GA STEEL, SATIN
COAT PRIMED AND POWDER COATED
Figure 1 - Features - Typical - Standard Models
3.8" [97mm]
2.9" [74mm] 12.0" [305mm]
9.7" [246mm]
11.8" [300mm]
Figure 2 - Overall Dimensions - Standard Models

Guardian Telecom Inc.
Installation and Operation
Model WRT
FACEPLATE - 16 GA STEEL, SATIN
COAT PRIMED AND POWDER COATED
MEMBRANE KEYPAD (WRT-20)
ID & APPROVALS
WIRING ACCESS PLATE
Figure 3 - Features WRT-20 with Optional Mounting Plate
Page 6
Figure 4 - Overall Dimensions WRT-20 with Optional Mounting Plate
6.0" [152mm]
3.9" [99mm] 3.8" [97mm]
2.9" [74mm]
9.7" [246mm]
13.0" [330mm]
11.8" [300mm]
Ø0.3" [Ø7mm]
12.0" [305mm]
14.0" [356mm]
3.0" [75mm]

Guardian Telecom Inc.
Installation and Operation
Model WRT
Page 7
Installing the WRT
•The WRT is set to tone dialing when shipped. If pulse dialing is required
see the section on Setting Tone/Pulse Operation.
•Follow all appropriate electrical codes and use only approved electrical
fittings for the installation.
See: Figure 5 - Setting
Dialing Mode &
Installation
•Choose a wall location that is free of obstructions and permits space for
wiring.
•Ensure mounting can support 6.5 lbs (2.95 kg) plus any additional,
foreseeable load.
See: Figure 2 - Overall
Dimensions - Standard
Models
•Ensure that none of the electrical connection circuits are live.
Mounting Without Optional Mounting Plate
•Use the appropriate template to locate and drill holes for mounting screws.
Use #10 or M5 screws to secure the unit to the wall. Use anchors in plaster
or cement to provide a firm grip for the mounting screws. Use sturdy hollow-
wall fasteners to mount the set to drywall.
•Loosen the five captive screws in the faceplate and swing the faceplate to
the left. If the set is on a vertical surface the faceplate will stay open like a
book in this position. Take care not to disturb the internal wiring.
See: Figure 2 - Overall
Dimensions - Standard
Models
•Secure the unit to the wall.
•Replace the faceplate. Do not over tighten the screws.
Mounting With Optional Mounting Plate
•Use the appropriate template to locate and drill holes for mounting screws.
•Secure the unit to the wall.
Wiring the WRT to the Telephone System
•Remove the wiring access cover plate.
•Bring cable into the enclosure through the conduit entrance and attach
individual wires from the exchange – Tip/Ring/Ground – to the surge
arrestor (Tip & Ring are not polarity sensitive). If a conduit hub is used,
ensure it is grounded to the ground stud.
•Replace the wiring access cover plate.
Final Check
•Check the set visually for loose screws and trapped wires. Check that the
handset hangs freely in the cradle and that the handset cord is not trapped
by the door.
•Check that the faceplate is snug to its gasket, paying particular attention to
the area around the cradle. Check that the door closes flush to the housing.
•Test the unit by calling to and from another unit on the exchange.

Guardian Telecom Inc.
Installation and Operation
Model WRT
Setting Dialing Mode
The WRT is shipped from the factory set for DTMF (Tone) dialing mode. If loop
disconnect (Pulse) dialing is required proceed as follows.
•Loosen the five captive screws in the faceplate and swing the faceplate to
the left. If the set is on a vertical surface the faceplate will stay open like a
book in this position. Take care not to disturb the internal wiring.
See: Figure 5 - Setting
Dialing Mode &
Installation
•Change the position of the Tone/Pulse jumper on the circuit board to Pulse,
as indicated on the label.
•The set will now be in pulse dialing mode, it can be returned to tone mode
by changing the position of the jumper back to the Tone position.
•Carefully replace the front plate and install all five screws. Do not over
tighten the cover screws, there is a flexible gasket between the cover and
the body. Excessive tightening of the screws deforms the gasket and
reduces the weather resistance of the set.
TONE/PULSE
JUMPER
GROUNDGROUND
GROUND
CONNECTION
TIP & RING
CONNECTION
Figure 5 - Setting Dialing Mode & Installation
Page 8

Guardian Telecom Inc.
Installation and Operation
Model WRT
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 the telephone from Tip and Ring power supplied by the PABX
or central office before making repairs or adjustments.
•Loosen the five captive screws in the faceplate and swing the faceplate to
the left. If the set is on a vertical surface the faceplate will stay open like a
book in this position. Take care not to disturb the internal wiring.
•Perform the necessary repairs or adjustments.
•Carefully replace the front plate and install all five screws. Do not over
tighten the cover screws, there is a flexible gasket between the cover and
the body. Excessive tightening of the screws deforms the gasket and
reduces the weather resistance of the set.
Note: Ensure that
connections are secure
before replacing
faceplate.
Fuse Replacement
•Remove the old fuse by pushing in the end cap of the fuse holder and
turning counterclockwise to open. Insert a new 0.25 amp, 250Volt, 3AG
fast blow fuse and close the fuse holder.
See: Figure 6 - Fuse
Replacement
WARNING!
•Replace only with a 0.25 amp 250V 3AG fast blow fuse. Failure to do so
will void the warranty.
•If, on reconnecting power, the fuse fails, 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 120 volts
AC.
Page 9
Figure 6 - Fuse Replacement
FAST BLOW
0.25 AMP. 3AG
FUSE

Guardian Telecom Inc.
Installation and Operation
Model WRT
Page 10
Programming The WRT-20 With Membrane Keypad
A direct memory access register can be assigned to each of the 10 number
keys. Tip: You can store up to
10 numbers in memory.
Each direct memory access register can contain up to 20 characters.
•Lift the telephone handset off the hook. Tip: Valid characters are
0-9, *, # and Pause.
•Press Program to put the phone into programming mode.
•Press Memory.
•Press a number key 0-9.
•Enter the telephone number you want to store. Valid entries are 0-9, *, #,
and Pause (e.g., 1-800-363-8010).
Tip: The number
selected is assigned to
the access register.
•If your phone requires you to dial 9 – or other digit – to access an outside
line, press the appropriate key, then the Pause key, then enter the
telephone number you want to store.
•Press Program again to leave programming mode and return to normal
telephone operation.
Operating the WRT
Manual Operation:
•Lift the handset and dial manually. Tip: Valid keys for
manual dialing are 0-9, *
and #.
Automatic Memory Dialing For The WRT-20 With Membrane Keypad
•Lift the handset.
•Press Memory.
Tip: Program the WRT-
20 to use this quick
dialing method.
•Press a number key 0-9.
•The number stored in the register will automatically dial.