1 CCR 301-25-27.0 - Heating System
27.1 All school
buses shall be equipped with two or more hot water heaters capable of
delivering water to the system at a rate of six gallons per minute using an
ambient temperature of 0 degrees Fahrenheit to +10 degrees Fahrenheit and
maintaining passenger compartment temperature of 50 degrees Fahrenheit. One of
the heaters shall be in the rear half of the bus on or behind the rear wheel
axle line. This standard must be obtained without a secondary heating source.
27.01(a) Lift-equipped buses may place the
rear heater under the last row of seats or wall mount. The front heater may be
wall-mounted.
27.2 Buses
shall be equipped with front heater(s) and integrated defroster system of
capacity to provide heat for the front part of the bus (including the driver's
compartment) and to keep the windshield area, service door glass, driver's left
glass area, and step well clear of moisture, ice, and snow.
27.3 Heater cores and fans shall be
completely encased but designed to permit servicing heater assembly by removing
all or part of the case.
27.4
Heater hose installation in the engine compartment shall include two shut-off
valves shutting off coolant completely when necessary.
27.04(a) One shut-off valve mounted between
the water pump outlet and heater hose connection.
27.04(b) One shut-off valve mounted between
the motor block and the return heater hose connection.
27.04(c) Heater hoses shall be adequately
supported to guard against excessive wear due to vibration. Hoses shall not rub
against the chassis, body, or other edges.
27.5 The body manufacturer shall add the
required amount of permanent ethylene glycol base or environmentally safe
equivalent antifreeze after heaters have been connected to protect the cooling
system of the bus to -30 degrees Fahrenheit tested at normal engine
temperature.
27.6 A heater water
flow regulating valve shall be installed for convenient operation by the
driver.
Notes
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