Heating, Ventilation And Air Conditioning - PREVOST H3-41 Manual

Switching Off the Heater
The fuel supply is interrupted when the heater is
switched "off". This causes the flame to go out,
and at the same time a delayed cut-out of 2.5
minutes begins. The circulating combustion air
flushes the remaining combustion gases out of
the chamber and cools off the heated parts on the
exhaust side of the heat exchanger. The water
circulation pump continues to transfer the latent
heat present in the heat exchanger, thus
preventing hot spots. Once the delayed cut-out
time expires, both the combustion air blower and
the water circulation
automatically. A cut-out will automatically take
place in case of preheater failure.
pump switch-off
4-10
HEATING, VENTILATION AND
AIR CONDITIONING
The coach interior is pressurized by an A/C -
heating system. Refer to "Controls & Instruments"
section. Air flow and controls divide the coach
into two areas:
- Driver area with defroster
- Passenger area
Pressurization of the coach interior helps to
prevent dust and moisture from entering.
Each area is fed fresh air and has a separate
return air and discharge air duct.
passenger's area also has a fan in the lavatory to
circulate fresh air and for heating and cooling.
The lavatory fan serves as the main air exhaust
for the coach.
WARNING: DO NOT LET TEMPERATURE IN
THE DRIVER'S AREA RISE ABOVE 72°F (22°C).
WARM TEMPERATURES
DROWSINESS AND
WHILE DRIVING.
BETWEEN 68°F TO 72°F (20°C TO 22°C).
To operate the air conditioning system
NOTE:
when the coach is stationary, run engine at fast
idle. When the A/C system is running, keep
windows and door closed.
To prevent battery run-down, the A/C and heating
systems will not operate if the charging system is
not working properly.
When the A/C system is running, park the coach
at least 4 feet (1,5 m) from other vehicles or
buildings to allow sufficient air flow through the
condenser core.
OTHER FEATURES
The
MAY CAUSE
AFFECT ALERTNESS
KEEP TEMPERATURE