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Related Manuals for PREVOST 100
Summary of Contents for PREVOST 100
- Page 1 HVAC & Battery Maintenance Recommendations Robert Hitt...
- Page 2 Agenda Welcome AC System fundamentals & Recommendations AGM Battery charging and characteristics...
- Page 3 WHAT DOES HVAC MEAN? ▪ H ren’t ehicles hartered ▪ Heating, Ventilating, Air Conditioning ▪ Six required major elements: Heating System ( H ) Air Handling System ( V ) Refrigeration system ( AC ) Control System ( C ) A driver who knows how to use it ( D ) A tech who knows how to fix it ( T ) If one of these items is missing, we will have an HVAC problem.
- Page 4 THREE RULES OF HVAC ▪ Learn the basics, ▪ Learn the basics, ▪ Learn the basics, CERTIFICATION! CERTIFICATION! CERTIFICATION...
- Page 6 REFRIGERANT STATE...
- Page 7 REFRIGERANT STATE...
- Page 8 Compressors used on main A/C systems Bitzer Model 4NFCY Bock FKX40/655K Carrier Model 05G Prevost and 9700...
- Page 9 COMPRESSOR OIL ▪ O5G ▪ No oil change interval ▪ It is recommended to change “on condition” ▪ Inspect oil to determine if it needs changing ▪ BITZER ▪ Check oil collection and tube; drain and document oil amount ▪ There is a definite oil change interval or change on condition ▪...
- Page 10 Oil level check requirements ▪ Refer to specific compressor manual for procedure ▪ Make sure coach is sitting level ▪ All compressors circulate oil throughout the refrigeration system All 3 types require high discharge pressure to “load” the system ▪ ▪...
- Page 11 MAINTENANCE INFORMATION BULLETIN FOR OIL...
- Page 12 Condenser Compartment...
- Page 13 DISCHARGE CHECK VALVE The condenser is just like a heat exchanger The hot gas starts at the top of the condenser By the time gas is 2/3 down the tubes it has changed back in to a liquid ▪ Keep the liquid from the condenser from back tracking in to the compressor.
- Page 14 Receiver tank The receiver tank is located in the condenser compartment (figure 30). The function of the receiver tank is to store the liquid refrigerant. During normal operation, the level of the refrigerant should be approximately at the midpoint of the lower sight glass.
- Page 15 EK-415 Emerson Filter drier...
- Page 16 MOISTURE INDICATOR...
- Page 17 Liquid line refrigerant solenoid types...
- Page 18 Evaporator...
- Page 19 X EVAPORATOR COMPARTMENT ARRANGEMENT...
- Page 20 Expansion valve...
- Page 21 SIX INCHES...
- Page 24 Evaporators should never wear a sweater!
- Page 25 “Rule Of Thumb” DISCHARGE PRESSURE _____________*F CONDENSER INLET TEMP PLUS (CONSTANT) 40* F EQUALS _____________*F P/T CHART TEMPERATURE _____________PSIG SUCTION PRESSURE EVAP RETURN AIR TEMP _____________*F MINUS (CONSTANT) 30*F EQUALS ____________*F P/T CHART TEMPERATURE ___________PSIG...
- Page 26 THREE RULES OF HVAC ▪ Learn the basics, ▪ Learn the basics, ▪ Learn the basics, CERTIFICATION! CERTIFICATION! CERTIFICATION...
- Page 27 AGM Batteries Advantages over lead acid Testing Charging Recommended Equipment...
- Page 28 SOME FACTS ABOUT AGM BATTERIES ▪ Absorbed Glass Mat. ▪ AGM use Lead-Acid combination same as common “Flooded batteries”. ▪ AGM batteries are valve-regulated, the cells are sealed with a pressure relief valve that prevents gases from escaping. ▪ Positive and Negative plate are sandwiched between layers of glass mat made of blend of...
- Page 29 ODYSSEY...
- Page 30 AGM have a 4 to 5X lifecycle over lead acid Resist Vibration & Shock Deep cycle capability Don’t leak or require filling...
- Page 31 SOME FACTS ABOUT SHIPPING Did you know AGM batteries are not consider as Dangerous good when come the time to ship batteries. As long as: -Battery post are protected against short circuits. -Battery is identified as “NONSPILLABLE” REF: LIFELINE Document 6-0101...
- Page 32 AGM VS OPEN CIRCUIT VOLTAGE ▪ Prevost use Volvo batteries #21258363 ( DEKA 8A31) 110 amp/h ▪ Reserve cap : 200 min and CCA : 800 Amp. ▪ Open circuit voltage of the battery is based on percentage of state of charge remaining in the battery. With OCV =12.6V , SOC = 75%, Charge is 110*75%= 82.5 amp/h.
- Page 33 Example: Prevost AGM has an OCV of 12.30V. (50%) . This battery need 55 amp/h charge. With a 20amp charger it will take 4 hours @ 65% efficient. TEST#2 : When the batteries is fully charged SOC =100% Perform a load test with a carbon pile. Load each battery individually with 400amp for 15sec.
- Page 34 PRIOR TO RECHARGE A BATTERY PERFORM A VISUAL INSPECTION Failed Good...
- Page 35 CHARGING A BATTERIES WITH OCV BELOW 8V • When batteries OCV is lower than 8V, each battery must be charge individually. • Most of batteries charger got a reverse polarity protection. Batteries charger will not automatically start when battery voltage is lower than 8V. To start the charge use charger polarity bypass switch or connect a good battery in parallel with the low OCV battery.
- Page 36 ▪ Checking current draw on batteries cable is good as long as you get enough load to have both alternators charging. Total amperage of 100 amp on main cable with 100 amp on alternator jumper do not mean upper alternator is not charging.
- Page 37 REPEAT CHARGING SYSTEM ISSUES • We first confirmed that the Alternator 1 (bottom alternator) was not charging using an Amp meter clamp. We also took some more readings. See below ALT 2: 28.35 volts Stud Temp: 46C Alternator temp: 133C 77 amps Voltage drop of 0.18 volt...
- Page 38 REPEAT CHARGING SYSTEM ISSUES ▪ We reinstall a new alternator and also build a new jumper cable that we crimped and soldered the ends. Here were the new readings ALT 2 (before stud): 28.44 volts Before stud ALT 2 (After stud): 28.39 volts After stud Stud Temp: 60C Alternator temp: 85C...
- Page 39 CHECK AMPERAGE IN-OUT Batteries equalizer is basically a 12V power supply. Total amp out of 12V post = 24V amp IN + GRD amp IN. TEST : Engine running, park brake apply, with max 12V load turned on (Headlamp, marker light and Radio) Check current with Amp-Meter.
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