Kubota B1830, Workshop Manual, Page: 500 / 548

CABIN B1830,B2230,B2530,B3030, WSM
10-M23
(1) Compressor Relay
Among the air conditioner components, current flows
to the blower motor and magnetic clutch. If all of these
current were to be passed through the main switch and
supplied, the current would be too large for the main
switch so that there will be danger or burning out the
main switch contact. If the current were to be passed
directly from the battery, forgetting to turn off the blower
motor could result in a discharged battery.
To protect against such trouble, a relay has been
provided. This relay has been made so that when current
flows through its coil, the contacts close to supply the
power from the battery. By employing this relay, the
current flowing through the main switch has been
decreased as only a small current is required to actuate
the relay. Thus there will be no danger of burning out the
switch contact, and when the main switch is opened, the
relay contact will open at the same time. This action
stops the current flow in the air conditioner circuit so that
there will also be no chance of the battery discharging.
9Y1210003CAM0029US0
(1) Battery
(2) Slow Blow Fuse
(3) Main Switch
(4) Compressor Relay
(5) A/C Blower Switch
(6) Blower Relay a: To compressor magnet
clutch
b: To A/C blower switch
c: To A/C blower motor
KiSC issued 05, 2012 A