Assessments - 1, GPA: 4
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Preventative Maintenance Checks and Services (PMCS) Systematic, periodic PMCS are essential to ensure that the heater is ready for operation at all times. Description Ref. Para. Daily Monthly Semi Annually Annually Interval Fuel Line system 1.1 BDA Exhaust Stack 1.2 B Fuel Supply 1.3 X BD,9Hrs Electrical Connections 1.4 B Remote Control Panel 1.5 B PUDA 1.6 B Ducts 1.7 B Sediment Bowl 1.8 1000 Hrs Carburetor 1.9 500 Hrs Burner Head 1.9 X Igniter 1.10 X Fuel Pump 1.11 X Heat Exchanger 1.12 X Overheat Safety System 1.13 B Text Box: B – Before Operation A – After operation D – During Operation Q – Quarterly PMCS Procedures 1.1 Fuel Line System - check all fuel lines and fittings for leaks. Make sure vent at top Suction Feed Adapter is clear of ice and snow. 1.2 Exhaust stack - make sure exhaust stack is clear of ice and snow. Check for damage or anything that might obstruct the flow of exhaust gas. 1.3 Fuel Supply – before filling, check for water or dirt at the bottom of the can. Fill can before operation. Heater will operate for about 9 hours with full can. Check at regular intervals to avoid running dry. 1.4 Electrical connections - check cord for nicks or cuts, make sure cord is securely plugged in to power supply 1.5 Remote Control Panel – check cord for nicks or cuts. Check overall condition of control box 1.6 Pop Up Duct Adapter – check for cuts in fabric. In the field, repair cuts with duct tape. Cuts may be sewn shut. If cut is too large to be sewn shut, replace entire fabric interface. 1.7 Ducts - check for cuts in fabric. In the field, repair cuts with duct tape. Cuts may be sewn shut. If cut is too large to be sewn shut, replace entire duct. 1.8 Sediment Bowl – check for dirt and water. Clean if necessary. 1.9 Carburetor, Burner Head – use the following procedure to service the carb and burner head: Line Callout 2: Check mixer for dirt and carbon deposits Line Callout 2: Check for carbon on igniter. Line Callout 3: Look for carbon deposits in this area. Line Callout 4: Check carb bowl for water, dirt, and varnish Cleaning, burner head 1. Remove Carb mixer assembly 2. Remove Igniter 5. Finish up with solvent wash commonly used in parts cleaning stations or carb cleaner. Let dry before assembly. ] Line Callout 3: 4. Clean these areas using compressed air. CAUTION: Wear appropriate eye protection when performing this operation Line Callout 3: 3. Clean carbon deposits in this area. Use a small wire brush. Cleaning, Mixer 1. Remove mixer from carb assembly Caution: The mixer assembly is made of brass and can be scratched or dented very easily. Great care must be taken not damage the mixer nozzle. The performance of your heater depends on this delicate part. 2. Soak mixer in solvent bath for an hour or so to loosen up carbon deposits. Mixer Assembly Line Callout 3: There are two concentric rings here. The center ring is paper-thin. Inspect for dents, scratches and nicks. This area must be free of dirt and carbon. Line Callout 3: 3. With a flashlight look for dirt or carbon here. Dirt may be blown out using compressed air. Do not use a pick or any hard tools to clean this area Line Callout 3: 4. Clean this area using a soft cloth and solvent. Wipe with a twisting motion. Text Box: GIMPORTANT If the mixer assembly cannot be cleaned satisfactorily, replace it. Reassembly Figure 1 shows the mixer assembly properly seated in the burner head. ( carburetor not shown for clarity) Figure 1 Figure 2 shows the mixer incorrectly seated. If left in this position combustion air will leak past the mixer and cause poor combustion and hard starting. Text Box: GIMPORTANT The mixer assembly must be seated correctly to insure that your heater has good combustion. Text Box: Figure 2 1.10 Igniter – Check igniter for carbon build up and signs of wear. As the igniter wears the gap between 1. and 2. will become wider and oval shaped. Replace when signs of wear are evident. 1.11 Fuel Pump – the fuel pump has a filter screen located at the inlet end. To clean remove three screws holding the cap on, remove the cap being careful not to tear the gasket, and remove the filter screen. Pay close attention to the orientation or the filter screen in the pump foe reassembly. Clean screen and cap with carb cleaner. Cap has a magnet to trap metal particles. Reassemble and check for leaks. 1.12 Heat Exchanger Inspect heat exchanger in accordance with the procedures in TM 5-4520-253-13 1.13 Overheat Safety System The overheat safety switch must be cycled before heater is used after storage or replacement of overheat switch. Overheat Testing - Start heater and let run for about 10 minutes without the ducts attached. Using a piece of paper or similar, block the inlet air about three-quarters of the way shut. At 70 degrees F the heater will shutdown in about a minute. Temperature at shutdown should be between 275 and 300 degrees F. If the overheat safety switch does not work it MUST be replaced. Replace thermostat in accordance with procedures in...
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