Air refrechment
14
Air filter
15
Air circulation
16
Drains
17
8
Condenser fan
Evaporator
5
Evaporator blower
9
Compressor
6
Clutch
7
10
Controller
11
Temperature sensor
12
Relay plate
13
Pressure switch
4
Thermostatic expancion valve
20
3
Dryer filter
Funcionamento do ar condicionado
Operating the air conditioner
Used to retain some dross and/or humidity that might
be in the system to avid reaching the expansion
valve
The expansion valve restricts the enty of the high-
presure refrigerant that is coming from the condeser
and its function is to regulate the refrigerant flowing
through the evaporator so as maintain the pressure
and temperature at the coil outlet
In the evaporator the refrigerant fluid, now at low
pressure, change its state from liquid to gas,
absorbing heating in this process from the bus’s
internal environment.
When it is functioning, the compressor draws the
refrigerant fluid from the evaporator at it gassy state
and loow pressure, compresses raising the pressure
and temperature and, discharges it into the
condenser
The compressor is powered by the veihicle engine
with a belt transmission power system and a
magnetc clutch whenever the air conditinioner is
operating in ‘cooling mode’
The condenser fans, as well as the compressor, will
only be on when the air conditioner operates in
‘cooling mode’
The evaporator blowers are on in both mode
ventilation and cooling modes and can operate at
two speeds.
The speed control can be automatic or manual
Installd on the bus dashboard, the controller enables
the driver choose the set-point temperature and view
the internal bus temperature, thereby giving the
driver complet climate control inside the bus.
Set-point: Is the value of the disired temperature
inside of the vehicle. Regulated by the operator
(driver).
The internal temperature is detected by the
temperarure sensor located in the returnig air.
The relay plate receives the orders from the
controller and turns on the condenser fans;
evaporator blowers and the compressor according
to the seletec operation mode.
The pressure switch are electrical devices the
monitors the working pressures air-conditioner.
Whenever there is change in the normal operational
pressure the compressor will shut down immediately
so to avoid breaking
Note: The working pressures are monitored
continuously even when the air conditioner is off
This permits the entry of the exernal in order to expel
unwanted odors and impurities from the vehicle.
The air return filter retains the dross suspended in
the air so as to avoide the accumulation of waste
in the evaporator coils.
The air, after being cooled in the evaporator is
distributed inside of the bus throgh some ducts.
These are used to conduct the condensate humidity
in the evaporator coils from the evaporator tray to
outside of the vehicle.
