Hvac Control Unit - PREVOST H3-45 VIP Owner's Manual

High Fan Speed
Use this rocker switch located on the
dashboard's R.H. side panel for
locking or unlocking the entrance door
from the driver's seat.
Brightness Control
Adjusts
dashboard instruments and switches.

HVAC CONTROL UNIT

FIGURE 24: CONTROL UNIT FOR HIGH CAPACITY
CENTRAL HVAC SYSTEM
FIGURE 25: CONTROL UNIT FOR DRIVER'S HVAC
SYSTEM
The temperature control in the driver's area is
provided directly by the driver section of the HVAC
control unit.
Using the Up/Down type switch sets the fan
speed. The set speed appears on the display.
In addition to the driver's area controls, the driver's
HVAC system also includes an auxiliary unit to
provide additional cool air behind the driver and for
the navigator seating area. Temperature is set by
the driver's section of the control unit. See
"Navigator air registers" on page 27
The R.H. section of the control unit AUX. FAN
operates the auxiliary unit and regulates its fan
speed. Using the < > switch sets the fan speed.
The set speed appears on the display.
the brightness of
PA-1619 Owner's Manual H3-45 VIP
The vehicle is slightly pressurized by the HVAC
system to prevent dust and moisture from
entering.
On high capacity central systems, airflow and
controls divide the vehicle into two areas: driver's
area with defroster and passengers' area. Fresh air
is fed in each area and has a separate return air
and discharge air duct.
NOTE
To operate the air conditioning system when
the
stationary, run the engine at fast idle. When the
system is running, keep windows and door
closed.
To prevent battery run-down, the central A/C and
heating systems will not operate if the charging
system is not working properly.
When the A/C system is running, park at least 4
feet (1,5 m) from other vehicles or buildings to
allow sufficient air flow through the condenser
core.
Separate driver and passenger heating, ventilation
and air-conditioning controls are located on this
panel. To operate, the vehicle's engine must be
running.
The units may be turned on by pressing the
following button:
Also, the driver's HVAC section turns on
automatically at engine start and uses the settings
that were kept in memory before turning off of the
system.
The A/C compressor starts automatically when
the two following conditions are satisfied:
1. The outside temperature is above 32°F (0°C).
2. The passenger's area temperature has
reached 7°F (4°C) under the set point.
NOTE
Upon starting if the outside temperature is above
32°F (0°C) and then drops below 32°F (0°C), the
compressor
temperature
condensation from forming on the windows.
All parameters set before turning the system Off
will be kept in memory for the next power On.
Controls and Instruments 4-25
will keep running
of 15°F (- 9°C)
up to a
to prevent