1 Colo. Code Regs. § 301-25-27.0
Current through Register Vol. 47, No. 22, November 25, 2024
Section 1 CCR 301-25-27.0 - Heating System27.1 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.38 CR 07, April 10, 2015, effective 4/30/201546 CR 14, July 25, 2023, effective 8/14/202347 CR 19, October 10, 2024, effective 10/30/2024