Whelen Engineering Company GTT 795DM Installation Manual Download Page 4

Page 4

Disable wiring:

The  use  of  a  disable  switch  is  highly  reccomended  so  that
emergency  vehicle  drivers  do  not  need  to  remember  to  shut  off
their  emitter  when  arriving  at  the  scene.  Without  using  this
feature,  nearby  intersections  may  be  unnecessarily  held  in
preemption by vehicles at the scene.

The disable function is entered when the WHITE wire transitions
either from +12V DC to ground or from a floating state to ground.

When installing the emitter the  installer should provide  sufficiant
wire/cable length to allow the end user to connect the WHITE wire
as discribed.

Indicator light:

The use of an indicator light either in a switch or stand alone is
highly  recomended.  The  indicator  light,  when  controlled  by  the
GREEN  wire  will  allow  the  user  to  determine  if  the  emitter  is
operating normally (steady indication), in disable mode (Flashes
once every 2 seconds), has failed (flashes 2 times per second).

The  GREEN  wire  provides  a  DC  return  for  the  indicator  light.
When  +12V  DC  is  provided  to  one  side  of  an  indicator  and  the
GREEN wire is connected to the other side (or to the light terminal
of  a  lighted  switch,  the  emitter  will  control  the  behavior  of  the
indicator light .

When installing the  emitter the installer should provide sufficiant
wire/cable length to allow the end user to connect the green wire
as described above.

WARNING! All customer supplied wires that connect to the positive terminal of the battery must be sized to supply at least 125%
of the maximum operating current and FUSED at the battery to carry that load. DO NOT USE CIRCUIT BREAKERS WITH THIS
PRODUCT!

Caution: Permanent mounting of this product will require drilling. It is absolutely necessary to make sure that no other vehicle
components could be damaged by this process. Check both sides of the mounting surface before starting. If damage is likely,
select a different mounting location.

IMPORTANT! It is the responsibility of the installation technician to make sure that the installation and operation of this product
will not interfere with or compromise the operation or efficiency of any vehicle equipment!

IMPORTANT! Before returning the vehicle to active service, visually confirm the proper operation of this product, as well as all
vehicle components/equipment.

RED

GREEN

Serial Communication (A)

Indicator Light

1 Amp Fuses

WHITE

BATTERY

BLACK
GREY
BLUE

Serial Communication (B)

WIRE FUNCTIONS:
GREY
WHITE
ORANGE
RED
BLUE
BLACK
GREEN

/

/

/

/

/

/ DC

/

Serial Communication (B)

Disable (Input)

Range Setting Enable

+12V DC

Serial Communication (A)

Ground

DC Return for indicator light

Summary of Contents for GTT 795DM

Page 1: ...vehicle occupants However because sustained periodic exposure to loud sounds can cause hearing loss all audible warning devices should be installed and operated in accordance with the standards established by the National Fire Protection Association Safety First This document provides all the necessary information to allow your Whelen product to be properly and safely installed Before beginning th...

Page 2: ...tlined in Step 1 Replacement Headliner Mounting Kit 01 0462780 00 Installation Style 2 Windshield Mounting IMPORTANT WARNING When this emitter is mounted it must not obstruct any part of the driver s view Make sure that after the emitter is installed the operator has an unobstructed view through the windshield IMPORTANT WARNING Do not install this product or route any wires in the deployment area ...

Page 3: ... personal injury or death Refer to your vehicle owners manual for the air bag deployment area The User Installer assumes full responsibility to determine proper mounting location based on providing ultimate safety to all passengers inside the vehicle Whelen Engineering Co assumes no liability or responsibility for determining individual applications or exact installation location criteria CAUTION ...

Page 4: ...ght When installing the emitter the installer should provide sufficiant wire cable length to allow the end user to connect the green wire as described above WARNING All customer supplied wires that connect to the positive terminal of the battery must be sized to supply at least 125 of the maximum operating current and FUSED at the battery to carry that load DO NOT USE CIRCUIT BREAKERS WITH THIS PR...

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