Buhler 535 - Manual (Page 50)

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3-2
Section 3 - Operation
Cab Controls & Instruments
Climate Controls
Heater
Before activating the heater, open the heater valve on
the rear/right side of the engine block () . Under most
cold-weather conditions it is not necessary to have the
valve completely open .
During hot weather, shut the heater valve off . This will
ensure that no engine coolant will flow into the heater
core .
Make sure the air conditioner is deactivated except
during defrosting . To increase the cab interior
temperature for cold weather operation, start the engine
and make sure the coolant temperature bar graph
indicates two or more bars . Rotate the temperature
control switch (3) to increase the temperature . Adjust
the fan speed switch (4) to increase or decrease air
flow .
Air Conditioning Operation
CAUTION: THE AIR CONDITIONING SYSTEM USES
R134A REFRIGERANT. DO NOT MIX WITH OTHER
REFRIGERANTS. DO NOT ATTEMPT TO TOP OFF
THE SYSTEM WITH ANY OTHER REFRIGERANTS.
CONSULT A QUALIFIED TECHNICIAN FOR ALL AIR
CONDITIONING REPAIRS.
The climate controls consist of a rocker switch (2)
which activates the air conditioning, and two rotary
switches, controlling the temperature (3) and the
pressurizer fan (4) .
Depress the top of the air conditioning rocker switch
(2) to activate the air conditioner . Depress the bottom
of the switch to deactivate the air conditioner .
The temperature control switch (3) is used to maintain
a constant temperature . Rotate the temperature
control switch counterclockwise to increase cooling .
Adjust the fan speed switch (4) to increase or decrease
air flow .
To aid in defrosting the windshield and side windows
the air conditioner and heater may be operated at the
same time . The air conditioner will remove moisture
from the air while the heater warms the air in the
cab . When the windows are clear, deactivate the air
conditioner .
F3-22
AUTO TEMP CONTROL
2 3 4
F3-21
1