ROTEL RKF-100 - Manual (Page 3)

Trigger In/Out 12VDC Mode
With the mode switch in the 12V position, and the ‘in’
input being used, the RKF-100 will move into its ‘auto’
mode whenever a 6V to 15V input signal is supplied
and the prescribed initial temperature has been reached.
Should you want to use one or more RKF-100 ’ s within the
same location you can synchronize the units by using
the ‘sync’ switch. For this situation you should use the
‘out’ jack from one unit (which then becomes the ‘master’)
and go into the ‘in’ jack for the second unit (which then
becomes the ‘slave’). The two units will now be ‘in sync’
and will start to work in unison once the prescribed
initial temperature of the ‘master’ unit has been reached.
Note that in this type of multi-unit installation all of the
internal temperature sensors of the ‘slave’ units are defeated.
Fan Auto-On Temperature
This switch enables you to pre-select one of two temperature
settings for activating the RKF-100. The low setting is 95
degrees Fahrenheit (35 degree Celsius) and the high
setting is 104 degrees Fahrenheit (40 degrees Celsius).
This important feature ensures that the fans only work
above the selected ambient temperature.
If you want to exhaust the hot air to the outside you will
need to remove the two ‘plugs’ and attach fl exible tubing
(not included with the unit). Please see page 4 for a
fuller description of this feature.
Fill out and send in the owner’s registration card packed with
the RKF-100. Also be sure to keep the original sales receipt.
It is your best record of the date of purchase, which you will
need in the event warranty service is ever required.
Care of the Product
Clean the product by dusting with a dry cloth. Do not
permit objects of any kind to be pushed and/or fall into
the product through the enclosure openings.
General Description
The RKF-100 is a multi-directional fan system that uses three
4.75-inch (120 mm) whisper quiet fans, the speeds of
which are governed by thermal sensing circuitry. The
RKF-100 is designed to be used in three different formats
-intake/blow/exhaust air. The required mode can be
confi gured locally according to the cooling requirements
of your system.
The RKF-100 has many other features and functions that
are all described in the following pages.
Front Panel Description
The (removable) rack mountable front panel houses a switch
for controlling the on/off and auto functions. A blue LED
indicates when the unit’s fans are actually working.
Behind the grille front is a removable air-fi lter pad.
It is important to note that the only time the switch
needs to be in the ‘on’ position is during an initial
test when the fans will be operating at their
maximum speed. Once the RKF-100 has completed
its test, it is recommended that the switch be
placed in its ‘auto’ position. In this mode neither
the fans nor the LED will operate until the selected
ambient temperature is reached.
Rear Panel Description
The following description identifi es each of the main controls
/connections and follows the rear panel from left to right.
Temperature Sensor
This input enables you to connect the (supplied) pigtail
sensing cord. The magnetized ‘head’ should be placed
on the ‘hot spot’ of your installation whereupon it will
measure the ambient temperature, which in turn will govern
the speed of the three fans.
Please note that there is also an in-built sensing device
located on the underside of the chassis that is by-passed
if the pigtail sensor is used. If the pigtail sensor is not
used, then the in-built sensor will automatically activate
once the selected minimum temperature has been reached.
3 English