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Heaters and Defrosters 7DEOHRI&RQWHQWV A3 Heaters and Defrosters A3 Heaters and Defrosters Table of Contents Table of Contents ........................................... 1 List of Figures................................................. 1 Safety ............................................................... 2 Figure 1—Control Panel............................ ...3 Warnings and Cautions ................................. 2 Figure 2— Air Delivery Ports ................... ...4 Introduction .................................................... 2 Figure 3—Inside Access Panel.................. ...6 Description of Operation ............................... 2 Figure 4—Auxiliary Electric Heater ......... ...7 Control Panel.................................................. 2 Figure 5—Under the Seat Heaters............. ...7 Heater .............................................................. 4 Figure 6—Heater Boost Pump .................. ...8 Heater Access.................................................. 4 Figure 7—Engine Compartment Heater Defroster Fan Operation ............................... 5 Piping......................................................... ...8 Heater Filter.................................................... 5 Figure 8—Heater Cutoff Valve Location.. ...9 Driver’s Heater............................................... 7 Heater Core..................................................... 7 List of Tables .................................................. 1 Under Seat Heater.......................................... 7 Table 1—Defroster Fan Location by Defrosting........................................................ 7 Option ........................................................ 14 Boost Pump ..................................................... 8 Table 2—Heater Cutoff Valve Engine Compartment Heater Piping............ 8 Location ..................................................... 14 Heater Air Bleed Procedure.......................... 8 Table 3—Heater Water Capacity............... 14 Cutoff Valves .................................................. 9 Troubleshooting.............................................. 9 List of Schematic ............................................ 1 Schematic 1—Kysor Heater ...................... 11 Schematic 2—Coolant Level Sender......... 12 Schematic 3—Coolant Temperature Sender ........................................................ 13 370-1 A3 Heaters and Defrosters Safety Introduction The purpose of this safety summary is to ensure the The Blue bird All American bus uses a hot water safety and health of personnel and the protection of type heater. Heat is used from the engine coolant. equipment. The air is delivered though the heaters inside the body. All users of this publication shall read, understand, and apply this safety summary when performing The major components are listed as follows maintenance and operating procedures. • Controls • Front heater WARNINGS and Cautions • Defroster • All users of this publication shall read, and • Driver’s Heater • understand, all WARNINGS and Cautions. • Under Seat Heater • Booster Pump • Heater Air Bleed Procedure • Cutoff Valves Description of Operation WARNINGS REFER TO A PROCEDURE OR PRACTICE, THAT, IF NOT Control Panel CORRECTLY OBSERVED, COULD RESULT IN INJURY OR DEATH. The operation/control switches for the heating and defrosting system is located on the main bus console, see Figure 1—Control Panel. Air distribution from defroster and heater outlets can be adjusted by rotating diffusers, see Figure 1— Cautions refer to a procedure or practice, Control Panel. that, if not correctly observed, could result in damage to or destruction of equipment. Make sure the engine radiator is full and all coolant flow valves are open. 370-2 A3 Heaters and Defrosters Figure 1—Control Panel 370-3 A3 Heaters and Defrosters Heater 3. For access to the air delivery ports, see Figure Performance of body heaters depends on adequate 2—Air Delivery Ports. engine coolant temperature. Thermostat rating regulates the heat. The thermostat rating should not be higher than the recommended rating of the engine manufacture. Note Outlets that have a wedge shaped base are adjustable vertically and horizontally. The main heater has a 3-speed control switch for manual speed operation. The main heater has additional maximum output for flash defrosting for extreme conditions. All the air from the main heater blower can be used for defrosting by leaving the main outlet and foot warmer outlet closed. Figure 2—Air Delivery Ports Heater Access • The front heater can be accessed from two (2) 4. For access to the heater core and filter from the locations. inside, remove the inside heater access panel, see Figure 3—Inside Access Panel. 1. From the outside, at the front of the bus, right- hand side. The heating system depends on heat generated by the engine to heat the coolant to operating 2. From the inside at the dash panel, near the temperature. The coolant is pumped through the stepwell. heaters inside the bus body, and back to the engine. Coolant flow varies with engine speed and increases with the use of the auxiliary water pump. 370-4 A3 Heaters and Defrosters WITH A HOT ENGINE RAPID VENTING DO NOT OPERATE A DEFROSTER FAN OR RAPID REMOVAL OF RADIATOR WITHOUT THE FAN GUARDS CAP WILL ALLOW COOLANT TO INSTALLED. SPRAY OUT TO PREVENT SERIOUS BURNS SLOWLY • The three-speed motor is checked for function VENT PRESSURE, THEN REMOVE by operating the motor switch located on the RADIATOR CAP. control panel. Defroster Fan Operation Heater Filter The defroster fan motor bearings are lifetime The air filter protects the main heater coil. To lubricated and do not require maintenance. change the air filter remove the front access panel, see Figure 3—Inside Access Panel. 370-5 A3 Heaters and Defrosters Figure 3—Inside Access Panel 370-6 A3 Heaters and Defrosters Driver’s Heater Under Seat Heater The adjustable outlets on the dash can be directed to There are two physical under the seat heaters. There the driver. The auxiliary unit under the driver’s seat are seat mounted and floor mounted. The heaters are is a two-speed fan. Air can be directed to the options for the A3 All American, see Figure 5— driver’s left side and around the steering column Under the Seat Heaters. area, see Figure 4—Auxiliary Electric Heater. Figure 5—Under the Seat Heaters Figure 4—Auxiliary Electric Heater Defrosting During initial engine warm up, the defroster blowers Heater Core should be operated at low speed to preheat the inside of the windshield glass. High humidity in cold is the cause for fogging of windows. That condition can be improved by WHEN USING COMPRESSED AIR FOR opening the forward drivers window to allow moist CLEANING, COOLING, OR DRYING, DO air to escape. NOT EXCEED 30 PSI. WEAR EYE PROTECTION AND DO NOT DIRECT COMPRESSED AIR AT SELF OR OTHERS. The heater will be efficient when the core and fins are clean. The core can be cleaned with compressed air or by vacuum. Damaged fins should be straightened with a fin comb to prevent airflow restrictions. Assess to core is though the right front inside access panel. 370-7 A3 Heaters and Defrosters Boost Pump Heater Air Bleed Procedure There is a 12 volt boost pump in the heater Use of antifreeze (ethylene glycol type) is assembly, see Figure 6—Heater Boost Pump. recommended for summer or winter operation. Use a 50/50 solution of antifreeze and water for freeze protection to approximately 30 degrees Fahrenheit below zero. Ultimate protection is attained at 68% antifreeze to 32% water. A 68 to 32 percent ratio will protect to approximately 92 degrees Fahrenheit below zero. WITH A HOT ENGINE RAPID VENTING OR RAPID REMOVAL OF RADIATOR CAP WILL ALLOW COOLANT TO SPRAY OUT TO PREVENT SERIOUS BURNS SLOWLY VENT PRESSURE, THEN REMOVE RADIATOR CAP. Figure 6—Heater Boost Pump • During the bleeding process, it is necessary to remove the radiator cap and refill the cooling Engine Compartment Heater Piping system. The refill is to ensure adequate • See Figure 7—Engine Compartment Heater coolant is available to replace purged air and Piping. coolant lost when bleeding. 1. Turn engine off to cool. 2. Shut all engine heater gate valves or clamp closed all heater hoses, as close to the engine as possible, see Figure 7—Engine Compartment Heater Piping. EXHAUST GASES ARE HARMFUL AND POTENTIALY LETHAL. DO NOT RUN ENGINE IN AN ENCLOSED AREA. PERFORM WORK IN A WELL- Figure 7—Engine Compartment Heater VENTILATED AREA. Piping 3. Fill cooling system completely, including surge tank with coolant. 4. Run engine until coolant hoses are warm to touch. 370-8 A3 Heaters and Defrosters 5. Open the heater hose supply line gate valve or unclamp supply line hose. 6. Check water pump to make sure it is running. Note Be sure to use a large container for draining coolant. 7. Run engine between 2,000 and 3,000 rpm. 8. Loosen bleeder valve located in heater hose line, see Figure 7—Engine Compartment Heater Piping. Note Coolant refill is necessary during bleeding. 9. Bleed air and coolant through bleeder valve until air is eliminated from heater system. Figure 8—Heater Cutoff Valve 10. Stop bleeding when continuous stream of Troubleshooting coolant is discharged. • Hoses 11. Open gate valve in heater hose return line after all air is purged. 1. Check all water hoses for kinks that prevent water flow. 12. Run engine between 2,000 and 3,000 rpm until thermostats open. 2. Inspect hoses for hardening of rubber, or cracks. 13. Refill cooling system including radiator surge • Coils tank. The heater coil can be accessed
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