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.

Guardian Telecom Inc.
Installation and Operation
Model WRT
Page 11
Engineering Specifications
ELECTRICAL PERFORMANCE
AUDIBLE RANGE FREQUENCY RESPONSE 300 –3400 HZ
DIALING METHOD DTMF OR 40/60 PULSE AT 10 PPS
TRANSMIT OBJECTIVE LOUDNESS RATING (TOLR) -38 +/- 3dB
RECEIVER VOLUME ADJUSTMENT +8.1 /-5.1 dB IN STEPS OF 2.7 dB
RECEIVE OBJECTIVE LOUDNESS RATING (ROLR)
-AT NOMINAL VOLUME LEVEL 50 +/- 3dB
-AT MAXIMUM VOLUME LEVEL 42 +/- 3dB
-AT MINIMUM VOLUME LEVEL 55.5 +/- 3dB
SIDE TONE OBJECTIVE LOUDNESS RATING (SOLR)
-AT NOMINAL VOLUME LEVEL 11 +/- 4dB
-AT MAXIMUM VOLUME LEVEL 7+/- 4dB
-AT MINIMUM VOLUME LEVEL 14 +/- 4dB
MEMORY DIAL (WRT-20 ONLY) 10 REGISTERS OF 20 DIGITS EACH
FLASH (WRT-20 ONLY) 600 MSEC TIMED DISCONNECT
MUTE (WRT-20 ONLY) PRESS KEY TO MUTE TRANSMITTER
REDIAL (WRT-20 ONLY) 31 DIGITS MAXIMUM
RINGER OUTPUT 75 dB MAXIMUM
FCC RINGER EQUIVALENCE 0.8B
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 20 -120 mA
CONNECTION METHOD SURGE ARRESTOR
FUSE ¼AMP 250 VOLT 3AG FAST BLOW
ENVIRONMENTAL
WEATHERPROOF ENCLOSURE NEMA 3R
TEMPERATURE -40O TO +60O C(-40O TO +140O F)
HUMIDITY 0TO 95% RH
DUSTPROOF FULLY GASKETTED ENCLOSURE
CORROSION RESISTANT MIL-STD-810E SALT FOG
MECHANICAL
HOOK SWITCH (CRADLE SWITCH)LIFE >1 000 000 OPERATIONS
BODY CONSTRUCTION GE VALOX 357®ENGINEERING POLYMER
DIMENSIONS 12 X 9.6 X 3.9 INCHES (305 X 245 X 99 MM)
NET WEIGHT 6.5 LBS (2.95 KG)
HANDSET MATERIAL HIGH IMPACT ABS
MICROPHONE NOISE REDUCING ELECTRET
OPTIONAL MICROPHONE NOISE CANCELING DYNAMIC
RECEIVER HEARING AID COMPATIBLE (HAC)
STANDARD MOUNTING VERTICAL WALL
WIRING ACCESS 7/8” DIAM.OPENING FOR OWNER SUPPLIED FITTING
HARDWARE MATERIAL STAINLESS STEEL

Guardian Telecom Inc.
Installation and Operation
Model WRT
Page 12
COMPLIANCE
DOC 1012 6721 A
FCC HQHCAN-22517-TE-E
WEATHERPROOF ENCLOSURE NEMA 3R
ENVIRONMENTAL SURVIVABILITY MIL-STD-810E
Replacement Parts
Part No. Description
P005765 Faceplate WRT (All Models)
P005479 Handset Shell – C/W 22” Armored Cord
P005477 Handset Shell Only – For WRT-10 & WRT-30
P002554 Cord – Handset 6’
P005961 Handset Cradle – C/W Reed Switch
P004371 Handset Retainer – WRT-40 Only
P000028 Microphone Cartridge – Noise Reducing
P004538 Microphone Cartridge – Noise Canceling
P002080 Receiver Cartridge
P005391 Handset Assembly – C/W 6’ Curly Cord For WRT-10 & WRT-30
P005699 Handset Assembly – C/W 22” Armored Cord For WRT-40
P005786 Keypad Assembly Plastic – C/W Telephone Circuit Board For WRT-10
P005582 Telephone Circuit Board
P000907 Keypad Cover – Teleseal For WRT-10
P006295 Keypad – Metal For WRT-30 & WRT-40
P006246 Universal Mounting Bracket 70 Series
P002782 Ringer – Floyd Bell BR-3-39
P005917 Reed Switch
P002992 Surge Arrestor – TII 126L1
P002991 Fuse – Glass 0.25 Amp 250V
P000126 Housing
P003045 Backplate
P002988 Door C/W Velcro Latch
P001706 Hinge Pin – 8.390 Nylon
P001488 Door Spring
P002995 Hinge Pin Retaining Ring

Guardian Telecom Inc.
Installation and Operation
Model WRT
Page 13
Government Certification
Attached to the telephone are labels for Industry Canada and the United States Federal Communications Commission. These identify
equipment certifications indicating the 60 and 70 series telephones meet certain telecommunications network protective, operational
and safety requirements. These agencies do not guarantee the equipment will operate to the user's satisfaction.
Before installing this telephone equipment, users should ensure it is permissible to connect the equipment to facilities of the local
telecommunications company.
Equipment must be installed using acceptable connection methods. In some cases, the telephone users inside wiring, associated with
a single line service, may be extended by a certified connector assembly (telephone extension cord). The customer should be aware
that in some situations compliance with the above conditions may not prevent degradation of service.
Repairs to certified equipment should be made by a supplier designated authorized maintenance facility.
For their own protection users should ensure the electrical ground connections of the power utility, telephone lines and internal
metallic water pipe systems, if present, are connected. This precaution may be particularly important in rural areas.
CAUTION: Users should not attempt to make ground connections, but should contact the appropriate electrical inspection authority
or electrician.
Load Number (LN)
The Load Number (LN) assigned to each terminal device denotes the percentage of the total load to be connected to a telephone loop
used by the device. Termination on a loop may consist of any combination of devices subject only to the requirement that the total of
the Load Numbers of all the devices does not exceed 100.
Notification to Telephone Company
Upon request, the customer must notify the telephone company of the particular line to which the connection will be made and provide
the Industry Canada or FCC registration number. The local telephone company may request disconnection of the telephone where
alterations or malfunctions affect the telephone’s performance.
United States Federal Communications Commission
This equipment generates, uses and can radiate radio frequency energy, and if not installed and used in accordance with the
instruction manual, may cause interference to radio communications. It has been tested and found to comply with the limits for Class
A computing device pursuant to Subpart J of Part 15 of FCC rules, which are designed to provide reasonable protection against such
interference when operated in a commercial environment. Operation of this equipment in a residential area is likely to cause
interference in which case the user, at his own expense, will be required to take whatever measures may be required to correct the
interference.
Interference
There is no guarantee that interference will not occur in a particular installation. If interference to radio or television reception from this
equipment is suspected, proceed as follows:
1. Unplug the set, check for the interference.
2. Re-orient the receiving antenna.
3. Relocate the set with respect to the receiver.
4. Move the set away from the receiver.
If necessary, consult the supplier or an experienced radio/television technician for additional suggestions.
FCC Rules and Ringer Equivalence Number
This equipment complies with Part 68 of the FCC Rules. On the side of this equipment is a label that contains, among other
information, the FCC registration number and ringer equivalence number (REN) for this equipment. If requested, this information
must be provided to the telephone company.
The REN is used to determine the quantity of devices which may be connected to the telephone line. Excessive RENs on the
telephone line may result in the devices not ringing in response to an incoming call. In most, but not all areas, the sum of the RENs
should not exceed five. To be certain of the number of devices that may be connected to the line, as determined by the total RENs,
contact the telephone company to determine the maximum REN for the calling area.
Service changes and Limitations
The telephone company may make changes in its facilities, equipment, operations, or procedures that could affect the operation of the
equipment. If this happens, the telephone company will provide advance notice in order for you to make the necessary modifications
in order to maintain uninterrupted service.
This equipment can not be used on public coin telephone service as provided by your telephone company. Connection to party line
service is subject to state tariffs (contact the state public utility commission, public service commission or corporate commission for
information.)

Guardian Telecom Inc.
Installation and Operation
Model WRT
Page 14
Warranty
Guardian Telecom warrants your product to be free of defects in material and workmanship for a period
of one year. Guardian Telecom will repair or replace any defective unit that is under warranty free of
charge.
This warranty is null and void if any non-authorized modifications have been made to this product, or if
it has been subjected to misuse, neglect, or accident. This warranty covers bench repairs only; such
repairs must be made at Guardian Telecom or an authorized service depot. Guardian Telecom is not
responsible for costs incurred for on-site service calls, freight, or brokerage.
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.
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 Inc.
7552 - 10th Street N.E.
Calgary, Alberta, Canada T2E 8W1
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.

Guardian Telecom Inc.
Installation and Operation
Model WRT
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 blow the
telephone’s internal, user-replaceable fuse. In the event of fuse burn-out, disconnect the
telephone from the power source, replace the fuse, 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 a RMA form online at
www.guardiantelecom.com, 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.

Guardian Telecom Inc.
7552 - 10th Street N.E.
Calgary, Alberta, Canada T2E 8W1
Toll-free 1-800-363-8010
Ph. [phone]
Fax. [phone]
www.guardiantelecom.com
E-mail: [email protected]
(Click to open message box)
Industrial Communications Worldwide
© Guardian Telecom Inc. 2009