KKK-B-1579B
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3.5.13.2 Air conditioning system installation. The air conditioning compressor and
auxiliary engine (see 3.5.13.4) shall be located in a compartment under the floor, in a
compartment at the rear or on the roof and shall be accessible for ease of maintenance and
service. A lamp, switch and junction panel shall be installed in the compartment. The
compartment door shall be capable of being opened and secured without the use of tools. When
the compressor and engine are roof mounted, an access ladder shall be provided. The condenser
and evaporator may be roof mounted. Mountings shall be so as to minimize transfer of vibration,
the size and weight of the assembly shall be to a minimum consistent with the performance
requirements specified herein.
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3.5.13.3 Air conditioning controls. The air conditioning system shall be designed for bus
operation and shall be complete with all necessary controls for automatic operation of the unit
after the auxiliary engine has been started. Air conditioner controls shall be panel mounted
within easy reach of the seated driver. A second set of controls shall be located in the auxiliary
engine compartment in series with the driver controls and with a safety switch to cut out the
driver controls. A thermostat control shall be located in the return air stream. The compressor
shall be controlled automatically on demand of the thermostat.
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3.5.13.4 Air conditioning auxiliary engine. The air conditioning system shall be
powered by an auxiliary engine. The auxiliary engine shall operate on the same type of fuel as
the chassis engine (see 3.4.3.2 and 3.4.3.2.1). The engine shall be of sufficient horsepower so
that when fully loaded at sea level conditions it shall not utilize more than 65 percent of available
power output under constant load conditions. Diesel engine shall be a two- or four-stroke cycle
and gasoline engine shall be four-stroke cycle. The engine shall be equipped with at least the
following components:
(a)
Magneto, electronic or coil and battery type ignition (for gasoline engine only).
(b)
Self-starter, 12-volt.
(c)
Resistor-type spark plugs, or resistor-type ignition wiring (for gasoline engine only).
(d)
Air cleaner.
(e)
Automatic choke (for gasoline engine only).
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3.5.13.4.1 Governor. A variable-speed governor shall be furnished. The governor shall
automatically control the engine speed at the selected rated speed.
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