55
d r i v e r
o r i e n t a t i o n
Passenger Area Heaters
Some
Vision
buses are equipped with optional passenger area heaters. The exact
placement and BTU rating of these heaters varies depending upon specific options
and seating configurations. Two types of passenger area heaters may be installed on
Vision
buses:
convection Perimeter Heaters.
This type of heater system is fully enclosed within
the main floor-to-wall body frame members which run the length of the body on
each side. Engine coolant is circulated through finned heating tubes running inside
the C-channels. Heated air circulation relies upon natural convection, rather than
forced air.
underseat Heaters.
This type of heater system uses several individual heater units
mounted to the underside of strategically located seats in the passenger area. Engine
heated water reaches these heating assemblies via tubes running in the body at the
floor. Each underseat heater unit has its own electrically driven circulation fan. The
fans are controlled by 3 position (High / Off / Low) rocker switches mounted in the
upper panel of the Driver’s side console.
Heater cut-off Valves.
The
Vision
’s heaters operate by circulating engine coolant
which is heated by the normal operation of the engine. Red-painted handled valves
are provided in the engine compartment to isolate coolant flow to the engine, there-
by removing all internal heaters from the circuit. Some bus operators choose to turn
these valves off during summer months.
Optional Convection Heaters
Heater Cutoff Valves
Right side of engine near frame rail
Top of engine toward firewall
Underseat Heater Switches
Optional Underseat Heater
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