T7 Lead: An Omega Engineering J-Type 5 position Fine Wire Thermocouple will be placed near the center of the air-out side of the condenser to capture the condenser air temperature Connect the multi-meter to the battery (s). Connect the ammeter to the battery Test Procedure Heat-soak the bus under test conditions for a minimum of two hours. Record the date, time of day, vehicle identification number and location. With the vehicle in park and all doors and windows closed, start the engine. Turn on the air conditioning system, set the a/c system to maximum cooling position and turn on all interior and exterior lights. Let vehicle run with the high idle on (approximately 1200 RPM on diesel engines and approximately 1500 RPM on gasoline engines). If the high idle is designed to automatically turn off after the first 15 minutes, the driver’s door will be opened and the high idle immediately turned back on to complete the test. This action will not invalidate the test Record all temperature readings (seven leads) in 30 second increments Record battery voltage readings at the battery (s) at the beginning of the test and at ten (10) minute increments thereafter Record amperage readings at the positive cable coming off the battery (s) at the beginning of the test and at ten (10) minute increments thereafter At the end of the 30 minute A/C pull down test there will be a 30 minute heat-gain test performed to determine the efficiency of the insulation in the bus using the same measurement equipment used for the A/C pull down test. Record all temperature readings (seven leads) in 15 second increments to determine fastest rise and total rise in bus interior temperature System Test Results During the test, the interior temperature of the bus should lower uniformly throughout and should lower the interior temperature within the prescribed time. The system will fail the test if: The temperature difference between C1, C2, and C3 varies more than two degrees during each 30 second reading during the last 15 minutes of the test
T7 Lead: An Omega Engineering J-Type 5 position Fine Wire Thermocouple will be placed near the center of the air-out side of the condenser to capture the condenser air temperature Connect the multi-meter to the battery (s). Connect the ammeter to the battery Test Procedure Heat-soak the bus under test conditions for a minimum of two hours. Record the date, time of day, vehicle identification number and location. With the vehicle in park and all doors and windows closed, start the engine. Turn on the air conditioning system, set the a/c system to maximum cooling position and turn on all interior and exterior lights. Let vehicle run with the high idle on (approximately 1200 RPM on diesel engines and approximately 1500 RPM on gasoline engines). If the high idle is designed to automatically turn off after the first 15 minutes, the driver’s door will be opened and the high idle immediately turned back on to complete the test. This action will not invalidate the test Record all temperature readings (seven leads) in 30 second increments Record battery voltage readings at the battery (s) at the beginning of the test and at ten (10) minute increments thereafter Record amperage readings at the positive cable coming off the battery (s) at the beginning of the test and at ten (10) minute increments thereafter At the end of the 30 minute A/C pull down test there will be a 30 minute heat-gain test performed to determine the efficiency of the insulation in the bus using the same measurement equipment used for the A/C pull down test. Record all temperature readings (seven leads) in 15 second increments to determine fastest rise and total rise in bus interior temperature System Test Results During the test, the interior temperature of the bus should lower uniformly throughout and should lower the interior temperature within the prescribed time. The system will fail the test if: The temperature difference between C1, C2, and C3 varies more than two degrees during each 30 second reading during the last 15 minutes of the test
TRIPS-MD-17-Part_2_RFP_%208-15-2017_FINALx11.docx