Table 2-2. Cab Controls and Instruments
250 GPM Mini-Pumper Firefighting Truck (Continued)
(Refer to Figure 2-2)
Control or Indicator
The Selector Switch is a six-position rotary switch used to select the
mode of operation. The following are the positions on the Selector
PA - Allows operation of the public address system through the common
microphone. When the switch is in this position, the red pilot LED is
RADIO - In this position, incoming radio messages are amplified by the
siren and rebroadcast over the external speaker. Siren tones (WAIL,
YELP, HI-LO) do not operate in this position.
STANDBY In this position, it is possible to operate the siren by activating
the manual pushbutton or mechanical siren foot switch.
A WAIL tone will be produced using either the manual pushbutton or
mechanical foot switch.
WAIL In this position, the siren produces a continuous WAILING sound
up and down in frequency. Depressing the manual pushbutton will
produce the YELP tone.