Appliance Specialty Study Guide
Contents
1. Measure line voltage to the air conditioner Did the candidate Use a VOM to check incoming static voltage at the air conditioner voltage connection points Start the air conditioner on high cool and check this voltage reading again after applying the load Interpret the accuracy and validity of these voltage readings should be between 103 5 amp 126 5 VAC Correctly diagnose and repair problems if any exist in accordance with the service manual if voltage readings are not within the pre described limits Measure the temperature difference across the evaporator supply amp return air temperatures Did the candidate Start the air conditioner in the high cool position Allow the air conditioner to run for a minimum of 30 minutes Open all discharge and supply air registers completely Place a thermometer near the return air grille ouvers and measure the air temperature Place a thermometer in the supply register louver and measure the air temperature RVIA 11 27 2011 38 of 51 Sign off sheet revised June 23 2008 Appendix 1 Signoff Sheets Verify accuracy and validity of this calculation to the manufacturer specifications 20 degrees difference nominal See service manual Accurately diagnose and repair problems if any exist in accordance with the service manual Measure the compressor amperage Did the candidate Start th2. D both the black and white compressor wires 16 The evaporator in an RV air conditioner A releases heat into the atmosphere B transfers heat from the conditioned space C transforms refrigerant vapor into a liquid state D vaporizes condensed moisture removed from the conditioned air 17 The rotary switch on a manually controlled air conditioner RVIA 11 27 2011 13 of 51 18 19 20 21 22 23 determines the direction of air flow controls the 120VAC to the compressor controls the thermostat selects the heating or cooling functions DOWD Before testing for an open or shorted capacitor with an ohmmeter you must first A confirm proper voltage at fan terminal B discharge the capacitor using a ammeter C Remove the capacitor from the air conditioner D Short the lead wires from the C and Run terminal A measurement taken by clamping a test meter around the run R or common C compressor lead will indicate A the starting voltage B nothing because this is an invalid test procedure C the unloaded compressor draw D the running amperage High side and low side are two types of restrictions found in the sealed refrigerant system The basic criteria to use in determining a restriction is are A amp draw and pressure B low side pressure C compressor startup amperage and temperature D temperature differential Used in evaluating air conditioner performance
3. Visually inspect gas flame burner tube flue box and wires Verify gas pressure and voltage Troubleshoot sequence of operation and repair replace various components thermostat ECO control valve burner electrode assembly temperature and pressure relief valve anode rod if applicable DSI module board main burner orifice thermal cutoff on off switch heating element 12VDC activated 120 VAC relay RVIA 11 27 2011 5 of 51 gas control valve d Drain and flush water heater and inspect fittings for calcium deposits reestablish air pocket in tank Check fittings on tank Inspect replace water tank Test replace fuse on board when applicable Verify air tight seal at gas line Perform function test Perform probe test on 12V 120 VAC section of DSI board Test replace mixing valve Verify by pass is in proper position if applicable Motor aid Check automotive coolant connections Check automotive coolant lines 38 Repair replace install water heaters Electric Verify voltage b Visually inspect wires and connections c Verify proper breaker size Troubleshoot sequence of operation and repair replace various d components thermostat ECO temperature and pressure relief valve anode rod if applicable on off switch heating element breaker fuses 12V e Drain and flush water heater and inspect fittings for
4. For the refrigerator to work properly on propane the propane pressure should be A 9 W C B 10 W C Cc 11 W C D 12 W C The proper procedure to clean an orifice assembly is to soak it in gasoline hot soapy water an alcohol based solvent sodium chromate DOWD If the refrigerator is not running on AC the first thing to check is the incoming Voltage on off switch circuit Breaker safety solenoid oomp To bench test an electric thermostat attach the leads of your VOM to the contacts of the thermostat and test for proper voltage continuity amp draw A VOM is not used for this test Jows When a capillary tube has lost its charge it is necessary to replace the thermostat replace the capillary tube recharge the cap tube replace the cooling core DODD Where hydrogen gas is combined with liquid ammonia Boiler Evaporator Absorber Condenser DODD RVIA 11 27 2011 33 of 51 157 In an absorption refrigerator the vaporizes in the hydrogen gas atmosphere and absorbs heat from inside the refrigerator A ammonia B neutralizing agent C water D zorbic acid RANGES AND COOKTOP 158 Eye level ranges are no longer produced because of what inherent factor A They consumed too much LP B They would fatigue and collapse under their own weight C They became too costly to the RV manufacturer D The ovens were chronically inaccurate 159 The pilot
5. Reston VA 20191 4363 Tel 703 620 6003 Fax 703 620 5071 www rvia org
6. D All the above A furnace cycling on limit may have a A restricted return air path B crushed delivery duct C faulty limit switch D All the above TDR stands for A Temperature Direct Resistance B Thermal Disk Resistor RVIA 11 27 2011 27 of 51 116 117 118 119 120 121 C Thermostatic Discharge Regulator D Time Delay Relay On a pilot model furnace equipped with a piezo ignition system the gap between the electrode and burner should be A 1 8 inch B 3 16 inch C 1 4 inch D 3 8 inch On a forced air furnace as the thermostat senses the interior air temperature the contacts will open removing power from the gas valve The blower motor will still continue to run until which device cools enough to stop the current flow to the motor gt Thermocouple B TDR C Limit switch D Circuit breaker Since the fan relay circuit is a normally open circuit there should always be voltage from the furnace circuit breaker to the A limit switch B sail switch C fan motor D fan relay terminal On a pilot model forced air furnace which of the following is NOT a cause for the symptom blower runs but fails to ignite burner A Defective blower relay B Low voltage C Faulty gas valve D Loose combustion air wheel A typical sail switch will close its contacts when the blower wheel reaches what percentage of its rated air flow A 50
7. charging and recovering per appropriate standards Inspect replace reversing valves Inspect replace filter dryer and capillary tubes Perform operational refrigerant test RVIA 11 27 2011 4of 51 35 Troubleshoot air conditioning problems a Troubleshoot AC and DC voltage b Troubleshoot freeze up c Troubleshoot poor air flow fan operation d Troubleshoot erratic operation e Troubleshoot no operation f Troubleshoot electronics g Troubleshoot drainage problems out of evaporator 36 Repair replace install water heaters Pilot a Visually inspect gas flame burner tubes thermocouple tightness flue vents b Verify gas pressure Troubleshoot sequence of operation and repair replace various c components thermocouple control valve burner pilot assembly temperature and pressure relief valve anode rod if applicable orifices pilot and main burner ECO energy cut off d Drain and flush water heater and inspect for calcium deposits reestablish air pocket in tank Verify by pass is in proper position if applicable Check fittings on tank Inspect replace water tank reseal flange Inspect install replace reigniter kit Verify air tight seal at gas line 3 KQ Perform function test 37 Repair replace install water heaters DSI Direct Spark Ignition 120 VAC and Motor Aid
8. door gaskets cooling unit drip hose i Perform function test 48 Install repair replace absorption refrigerators Automatic selection Verify proper installation and venting per mfg specs Verify AC and DC power sources per mfg specs Verify propane pressure Verify leveling of refrigerator per mfg specs Diagnose replace electric components upper circuit board lower circuit board electronic igniter electrode and sensor high voltage cable relay heating element AC DC thermostat or thermister interior light and switch fuses climate control heater high humidity heaters valve assembly wire harnesses and connectors low ambient switch power ventilator fan f Diagnose replace gas components shut off valve filter thermostat solenoid valve assembly includes safety valve thermocouple or sensor probe burner assembly flue baffle flue cap orifice g Diagnose replace cooling unit m o Jajo o jo RVIA 11 27 2011 9of 51 h Verify seals for air tightness inspect and verify proper cabinet combustion seal per mfg specs and codes e g NFPA 1192 and CSA Z240 door gaskets cooling unit drip hose i Repair replace internal ice maker components evaporator coil compressor ice mold assembly water valve timing motor ice mold
9. the delta temperature relationship is the temperature change between the evaporator and condenser high side and low side refrigerants air entering and leaving the evaporator coil air entering and leaving the condenser coil DOWD Normal delta temperature is approximately 20 degrees Fahrenheit An increase in will decrease the delta temperature A voltage B amperage C humidity D air temperature The pressure of the refrigerant as the ambient air temperature A increases decreases B is unaffected changes C increases increases D decreases increases RVIA 11 27 2011 14 of 51 24 25 26 27 28 29 30 The water dripping on the roof of an RV from an A C unit has been removed from the A moisture inside the RV B condenser C cap tube D evaporator Improper or insufficient air flow through the coils of the evaporator and condenser is the second most common reason why air conditioners stop cooling What is the main reason A Compressor failure B Owner neglect C Refrigerant leak D Electrical problem Liquid refrigerant is vaporized by the absorption of heat and moisture from inside the coach in what component A Condenser B Evaporator C Compressor D Cap tube The high temperature overload switch is directly affected by the current draw at the compressor and also the temperature of the windings air over the condenser return air to t
10. 10 C 50 to 60 F 10 to 16 C 3 Normal operating temperature for the central hot water heating system is degrees Jow 120 to 140 F 49 to 60 C 140 to 165 F 60 to 74 C 165 to 180 F 74 to 82 C 175 to 200 F 82 to 93 C REFRIGERATORS 137 Only pure ammonia vapor is present after the contents pass through which component 138 139 140 141 142 Jow Boiler Pump tube Rectifier Absorber The static pressure of the hydrogen vapor inside the cooling unit DODD is 150 PSI is 250 PSI is 600 PSI varies with the heat source The purpose of sodium chromate inside the cooling unit is to DODD regulate the condensation of ammonia vapor remove water molecules from the weak ammonia mixture protect the insides of the piping All the above Which component is not associated with the electric operation of the RV refrigerator DOWD Boiler Water separator Flue None of the above In which component does ammonia cool into a liquid DODD Generator Condenser Evaporator Absorber What removes heat from the ammonia vapor A Absorber coils RVIA 11 27 2011 31 of 51 143 144 145 146 147 148 149 B Low temperature evaporator C High temperature evaporator D Air moving through the condenser fins During a refrigerator installation never allow the side clearances to extend beyond A 1 2 inch B 1 4 i
11. Backup wrenches are used RVIA 11 27 2011 12 of 51 to help break free rusted fasteners to prevent damage to propane connections to tighten fasteners during installation when primary tools are in use DOWD 11 What propane system fault condition may be present at an appliance in a retracted slideout yet not seen when the room is extended A Pressure drop over time B Low or no gas pressure C Surging gas pressure D High gas pressure 12 Automatic changeover regulators are found on A ASME tanks B 20 DOT cylinders C any propane container D dual DOT cylinders 13 Regarding regulator lockup which of the following statements is false A timed pressure drop test must be preformed after setting the lockup pressure If lockup pressure exceeds 14 w c the regulator cannot be repaired If system pressure continues to slowly rise after lockup the regulator cannot be repaired A lockup test must be performed after every regulator pressure adjustment DODD AIR CONDITIONER 14 The air conditioner is a 120 VAC 60 Hz appliance The proper operation range is A between 5 114 and 126 VAC B between 10 103 5 and 132 VAC C between 15 102 and 138 VAC D between 110 and 130 VAC 15 To measure the total amperage drawn by an RV air conditioner you would attach an ammeter to A the black compressor lead B the A C circuit breaker in the panelboard C the A C junction box
12. Energize relay to start fan Accurately diagnose and repair problems if any exist in accordance with the service manual Or Ignition Board Did the candidate Verify proper DC voltage to ignition board see manual Verify function of ignition board see manual functions Spark DC voltage to gas valve Sense flame Accurately diagnose and repair problems if any exist in accordance with the service manual Gas Valve Did the candidate Measure proper voltage at valve Remove power wires and check coils for proper resistance 30 50 ohms Check for proper gas flow exiting valve orphic if ignition fails check by smell or use manometer Accurately diagnose and repair problems if any exist in accordance with the service manual Electrode Did the candidate Check for proper gap see manual Check for proper spark across electrode to ground Accurately diagnose and repair problems if any exist in accordance with the service manual Did the candidate RVIA 11 27 2011 45 of 51 Sign off sheet revised June 23 2008 Appendix 1 Signoff Sheets Water Heater Sign Off Sheet Printed Technician Name ID Number Address Telephone Number City State Zip Code STEP Initials Date Install or Verify The Accuracy of a Water Heater s Installation The candidate must describe and record these characteristics of
13. flame on an RV range is typically controlled by either a manual on off valve or by the oven thermostat safety valve consumer flash tube positioning DODD 160 The oven safety valve A essentially controls the function of the thermostat B contains a thermal bulb positioned in upper rear section of the oven cavity C allows propane vapor to flow to the main burner when the pilot is on the lower pilot flame setting D contains a thermal bulb which is heated by the standing oven pilot 161 A cooking appliance with top burners only is called a A stove B cooktop C manifold D range 162 Care must be taken when replacing burners and orifices to ensure compatibility with piping size compliance with ANSI NFPA 1192 matching of Btu hr ratings you do not exceed the propane supply capacity DODD 163 A thermal bulb performs which function A Controls gas flow B Senses oven temperature RVIA 11 27 2011 34 of 51 164 165 166 167 C Maintains pilot light D Controls safety valve Which flame sensing device controls the gas flow to the oven standing pilot Pilot assembly Thermal bulb Safety valve There is no flame sensing device DODD A well adjusted burner flame can be recognized by a slight hissing sound blue flame without a primary inner cone crisp blue flame with blue inner crown soft blue cone with inner yellow crown DOWD Burner orifi
14. gas solenoid is functioning A Voltmeter B Ammeter RVIA 11 27 2011 1l of 51 Ohmmeter Test light 90 04 11 inches water column is the A vapor pressure in a propane bottle at OOF B maximum pressure indicated by a dial type manometer C pressure coming from the second stage of a propane regulator D propane regulator lock up pressure 05 What percentage of propane flow is required when setting the system operating pressure adjusting regulator A 0 B 25 C 50 D 75 06 Which two methods are used to determine if a leak in the propane system exists 1 Timed Pressure Drop 2 Leak Detector Solution 3 Regulator Lockup Test 4 Bubble Leak Tester A 2and4 B 1and3 C 2and3 D 1and4 07 Which two methods are used to locate a leak in the propane system 1 Electronic Leak Detector 2 Leak Detector Solution 3 Pressure drop Test 4 Hearing hissing sound A 1and2 B 2and3 C 3and4 D 1and3 08 It is required that you change the fill valve on a mounted ASME tank To safely remove propane from the tank you will open the outage valve and drain the liquid remove the fill valve with the cap on burn off the propane with a suitable torch open the service valve until the vapor is gone DOWD 09 An opened outage valve is used A to indicate excess pressure B for container purging C to determine when container is empty D to indicate the maximum liquid level 10
15. good DSI gas valve should read between 15 to 30 ohms 30 to 50 ohms 50 to 70 ohms 70 to 90 ohms DODD On DSI models with three probes at the igniter one probe is for the spark one for the sense circuit and one for the RVIA 11 27 2011 22 of 51 A energy cut off B ground C E C O D D gas valve 81 For proper operation the minimum supply voltage coming into an Atwood DSI model is A 9 5 VDC B 10 5 VDC C 11 5 VDC D 12 5 VDC 82 To minimize P amp T valve weeping replenish the internal air pocket inside the tank Which step below is not a part of that process A Turn on the water heater B Turn off the water pump and or disconnect the city water C Open a hot water faucet inside the RV D Pull or open the handle on the P amp T valve and allow water to flow out until it stops 83 Which of the following is not a function of the PC board A Powers the coil portion of the gas valve B Monitors the burner flame C Produces the micro amps for the flame sense circuit D Performs lockout when necessary 84 To remedy a lockout condition on a DSI water heater replace the PC board adjust the probe gaps turn off the power switch then turn it back on tighten all the ground connections DOWD FURNACES 85 The main burner orifice size and combustion air volume of a furnace determines the A furnace type B efficiency percentage C BTU rating D combustion cha
16. if there is insufficient air to purge the combustion chamber A Limit switch B Sail switch RVIA 11 27 2011 24 of 51 95 96 97 98 99 C D A A B C D Time delay relay Heat anticipator high temperature safety device on a furnace is the Limit switch Sail switch Time delay relay Heat anticipator Which will not affect the operation of the sail switch DOWD fan speed duct volume gas control assembly return air volume Obstructions in the furnace air vent tubes will create A alean fuel air mixture B excessive heat circulation C blower motor overheating D arestriction in the flow of secondary air When voltage is supplied to the DSI circuit board there is a an before ignition A approximate 20 second delay B gas pressure check C lockout sequence D flame monitoring cycle The coolant level in a hydronic heating system is checked by DODD allowing the unit to cool and opening the heat exchanger at time of manufacturer the unit is sealed at the factory visual inspection of the expansion tank using the coolant level dipstick 100 The flame sense function on a DSI furnace equipped with a remote sense circuit senses 101 the flame via a separate electrode On a furnace equipped with a local sense circuit the flame is actually monitored and sensed via A the ground electrode B the spark electrode C a hard wi
17. load g Verify wire size to mfg specs 45 Troubleshoot furnaces problems Hydronic Troubleshoot orifice issues Replace orifice Clean burner chamber Clean electric eye Replace ignition valve Replace mixing and zone valves Repair replace pumps 46 Troubleshoot furnace problems all others Troubleshoot voltage problems Troubleshoot propane pressure problems Troubleshoot ducting problems Troubleshoot air flow problem 47 Install repair replace absorption refrigerators Manual selection Verify proper installation and venting per mfg specs Verify AC and DC power sources per mfg specs Verify propane pressure Verify leveling of refrigerator per mfg specs Diagnose replace electric components selector switch electronic igniter Piezo igniter electrode high voltage cable relay heating element AC DC thermostat interior light and switch fuses f Diagnose replace gas components shut off valve QA O ajlo jojo KQ w ajio jo w jalo jo RVIA 11 27 2011 8 of 51 filter if appropriate thermostat bypass screw safety valve assembly thermocouple burner assembly flue baffle flue cap orifice Diagnose replace cooling unit Verify seals for air tightness inspect and verify proper cabinet combustion seal per mfg specs and codes e g NFPA 1192 and CSA Z240
18. needs to be restored the pipe fittings need new sealant or Teflon Tape the P amp T relief valve needs flushing DOWD 72 Replace the anode A every six months B three times per year C only after the initial warranty period expires D when it has been reduced in size by 25 73 Atwood s newer adjustable DSI thermostat control allows temperature settings between RVIA 11 27 2011 21 of 51 74 75 76 77 78 79 80 A 90 140 degrees F B 100 150 degrees F C 110 160 degrees F D None of the above All 120 VAC heating elements for RV water heaters are rated between 500 1000 watts 1000 1500 watts 1500 2000 watts None of the above DOWD Electric heating element 1500 watts Incoming voltage 120 VAC What would be the resistance measurement of a good working element A 9 6 ohms B 10 34 ohms C 12 5 ohms D 16 8 ohms On a water heater with an adjustable main burner assembly the preliminary setting of the air shutter should be 1 4 open position 1 4 inch opening 1 2 inch opening half open position DOWD On a DSI water heater the E C O is typically set to 160 degrees F B 170 degrees F C 180 degrees F D 190 degrees F gt When its rating is exceeded the ECO on a DSI unit will immediately shut down the A PC board B thermostat C thermal cut off D gas valve The resistance measurement of the coil portion of a
19. proper installation of a furnace Did the candidate Verify proper ducting Verify proper return air Verify proper gas pressure at furnace Verify proper propane connections and conduct a leak test Document leak test results Verify proper DC AC voltage at furnace Verify proper exhaust vent system Verify proper seals at door vents etc Accurately diagnose and repair installation problems if any exist in accordance with the installation manual Evaluate Furnace Performance Measure line voltage at the furnace Did the candidate Check incoming voltage at the wire connections on side of furnace Nominal voltage should be 10 5 13 5 VDC under unloaded condition Turn furnace on Verify ignition Check voltage at the wire connections on side of furnace Nominal voltage should be 10 5 13 5 VDC under loaded condition Accurately diagnose and repair problems if any exist in accordance with the service manual Measure propane pressure at furnace Did the candidate Turn propane off at container Install manometer at pressure test port Turn propane on at container Check for proper gas pressure see service manual RVIA 11 27 2011 42 of 51 Sign off sheet revised June 23 2008 Appendix 1 Signoff Sheets Document measurement results Accurately diagnose and repair problems if
20. 0 and 130 VAC 120 and 140 VAC DOWD RVIA 11 27 2011 29 of 51 129 130 131 132 133 134 135 The device that controls the fan causing it to purge the combustion chamber of any residual gases before the furnace attempts to light is called the A limit Switch B sail Switch C D S I circuit board D Time Delay Relay The thermostat has an anticipator which will burn out if the TDR and gas value draw more than amps A 0 2 B 0 5 C 0 7 D 1 0 Some manufacturers recommend replacing the gas solenoid valve on a D S I furnace if the coil is defective One way to know if a coil is defective is when the resistance is not within a range of ohms A 20 to 40 B 30 to 50 C 40 to 60 D of over 60 The component of a furnace that sends a high voltage spark to the electrode assembly and sends 12 VDC to the gas solenoid valve is the A generator board B D S I circuit board C limit switch D sail switch The central hot water heating system has an electrical heating element which is watts A 800 B 1200 C 1475 D 1650 The central hot water heating system has a water and antifreeze ratio of A 1to1 B 1to2 C 3to4 D 2to1 To prevent freezing of the water system adjust the bay thermostat on the central hot water heating system to degrees RVIA 11 27 2011 30 of 51 136 DOWD 20 to 30 F 7 to 1 C 30 to 40 F 1 to 4 C 40 to 50 F 4 to
21. 156 157 158 159 160 161 162 163 164 165 166 167 OFOTDWODWDOVFSFOFWDFSFVUHPOOKFSFVONOWDFUYFVBDWOAINIWNOVNFSFVBWABDVNWO 36 of 51 RVIA 11 27 2011 37 of 51 Appendix 1 Signoff Sheets Air Conditioning Printed Technician Name ID Number Address Telephone Number City State Zip Code Install Or Verify The Accuracy Of An Air Conditioner s Installation The candidate must describe and record these characteristics of an air conditioner Did the candidate Record the air conditioner model number Record the air conditioner serial number Record the type of air conditioner ducted or non ducted Indicate OEM or Aftermarket installation Verify compatibility of the component parts i e Rooftop unit Ceiling plenum Wall control The candidate must confirm the proper installation of an airconditioner including the ceiling plenum Did the candidate Verify the air conditioner is bolted down properly Gasket compression approximately 50 Verify proper ceiling plenum installation including return and supply air separation Verify installation wiring conforms to all applicable codes proper wire gauge breaker size etc Verify adequacy of ducting vents and size of registers per installation instructions service manual Accurately diagnose and repair problems if any exist in accordance with the installation instructions Evaluate Air Conditioner Performance
22. B 75 C 100 D None of the above If so equipped the heat anticipator can be found at or near the TDR attached to the gas valve pilot models only on the circuit board DSI models only in the wall thermostat DODD RVIA 11 27 2011 28 of 51 122 Ona DSI furnace the circuit board will allow the blower to purge the combustion chamber for a set period of time open the gas valve confirm the presence of a burner flame All the above DODD 123 While the furnace is operating the TDR will draw approximately A 2 amp B 5 amp C 1 amp D the same amount of current as the heat anticipator 124 Which component contains a bimetal disk a coil and contacts for the thermostat ground connection and positive 12 volts DC Circuit board Electronic wall thermostat TDR Resettable limit switch DOWD 125 When troubleshooting the redundant gas valve on the DSI forced air furnace a good coil will measure 10 20 Ohms each 20 30 Ohms each 30 50 Ohms each above 50 Ohms each oomp 126 The voltage range for proper heater operation is 10 5 to 13 5 VDC 12 5 to 16 VDC 110 to 130 VAC D 120 to 140 VAC DODD 127 The thermocouple on a gravity heater creates millivolts 5 to 15 10 to 20 20 to 30 20 to 40 DODD 128 Forced air gravity heaters should have a voltage of between and at the furnace during operation 8 0 and 12 5 VDC 10 5 and 13 5 VDC 11
23. Recreation Vehicle Industry Association SG Study Guide for Appliance Special Study Guide for the Certified RV Appliance Specialist Test Compiled by the Recreation Vehicle Industry Association Table of Contents Study Guide for the RV Appliance Certified Specialist TeSt ssssseeeeeee 1 OVETVIEW otiinntidiewuimuiineiuiuiiiiuumouimidauduiddiaiialbaidaiasn 1 What is an RV Service Technician ccccccccececcccceceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeess 1 RVST Caeer Ladde 00ssssssssssssssssssssssssssssssscsssssssssssssssssssssssssssssseseees 1 What You Must Know to Pass the RV Appliance Certified Specialist Test 2 Fs IS ates tay A essen sim enous E E T 3 Taking the TOS bs dicssccccersrenettatard sa atancedknhnndadthadednonebehiaantadloaaatiohiaaiaedadsaalasntansaud 3 RV Appliance Specialist Standards Chart ccccccccccceseceeeeeeeeeeeeeeeenneeeeeeeees 4 Sign off Sheet Required Knowledge ccccccceeeeeeeeececeeeeeeeeeeeeeesneeeeeeeeees 11 Practice QUCSHONS sisitctdsscieatatadsentabadaieaddbadsbaddenesbasdunibasdenssvastosiandsouvasteoeoeds 11 Answer Key for Practice QUESTIONS ccceceeeeeeeeeeeeeeeeeeeeeeeeeeeeetenneeeeeeeees 36 RVIA 11 27 2011 Study Guide for the Certified RV Appliance Specialist Test Compiled by the Recreation Vehicle Industry Association Overview The purpose of this Study Guide is to help the Recreation Vehicle RV Service
24. Technician prepare to take and pass the RVIA RVDA Certified RV Appliance Specialist Test Note The Certified RV Service Technician and Specialist is a Recreational Vehicle Industry designation It does not constitute licensing or permission to perform any function or task controlled by state or local regulations Technicians are required to meet all state and local requirements before performing any regulated tasks What is an RV Service Technician Recreation vehicles have come a long way since the early days of the RV Industry especially in the technical sense So much so it takes training dedication and the command of specialized skills to become a successful RV service technician Today s service technician must acquire and apply intelligent troubleshooting skills covering the vast amount of technical equipment found within a wide range of recreation vehicle types In addition a qualified RV service technician must be proficient with a variety of hand and powered tools and have the ability to read understand implement and install numerous accessories and add on components common to the RVing lifestyle Performing proper k and complete preventive maintenance procedures is yet another must have skill the qualified service tech will master The reward is that once the above is accomplished a valued RV service technician will seldom if ever be without a job To this day there remains a remarkable shortage of qualified RV serv
25. a water heater Did the candidate Record the water heater model number Record the water heater serial number Verify type of control system The candidate must confirm the proper installation of a unit Did the candidate Check the seal around the flange Confirm the vent is clear and properly gapped from door screen 0 to 1 4 see installation manual Confirm the gas line is properly sealed from interior of coach Verify wiring complies with NEC code if applicable Conduct a leak test on the propane connection to the water heater Verify the water heater is properly supported Accurately diagnose and repair problems if any exist in accordance with the installation instructions Evaluate Water Heater Performance Measure propane pressure at water heater Did the candidate Turn propane off at the container Install manometer on the provided pressure test port Turn propane on at the container Check for proper propane pressure see service manual Document results Accurately diagnose and repair problems if any exist in accordance with the service manual Verify customer complaint Did the candidate Visually inspect gas flame burner tube flu box and wires Troubleshoot Key Components Determine the proper pilot control type pilot DSI or electric Pilot Control Gas va
26. affect the flow of propane when attempting to light the pilot light A Thermocouple B Propane system pressure C Pilot orifice D Gas Valve Which component does not affect the electrode sparking on a DSI water heater Thermocouple Circuit board 12 VDC power supply Gas valve coil DOWD Temperature and pressure T amp P relief valve weeping A indicates a defective valve RVIA 11 27 2011 19 of 51 60 6l 62 63 64 65 66 B is normally controlled by lowering water temperature C is a natural event D is corrected by opening and closing the valve Excessive sooting in the combustion chamber of water heater can be caused by an open propane valve coil an overfilled propane container high water pressure misaligned burner DOWD A water heater bypass valve that is incorrectly set can cause A variations in water temperature at the faucet B aloss of water pressure C high water temperatures at the faucet D aninterruption of the propane supply to the burner assembly A component that protects the water heater tank from corrosion is called a an A anode B cathode C encapsulator D tank sealer Another way to check the heating element is to check resistance After the power has been turned off and the wires disconnected from the heating element you can check the resistance The water heater is a 120 VAC 1000 watt heater What is the correct resist
27. ance A 8 33 ohms B 9ohms C 14 46 ohms D 16 8 ohms The pilot model water heater must be supplied with inches nominal water column of propane in order to work A 7 B 9 C 11 D 13 D S I stands for A Direct Spark Injection B Double Spark Injection C Double Spark Ignition D Direct Spark Ignition The thermal cut off device RVIA 11 27 2011 20 of 51 opens the electrical circuit shuts off propane flow opens the air shutter opens the exhaust vent DOWD 67 The same customer has returned three times with the same problem Each time you replaced the circuit board and the D S I water heater works for a short time What is probably happening A Poor quality control during board manufacture B The consumer is overworking the water heater C An outside influence is destroying the boards D The wrong water heater is installed in the RV 68 Propane valve coils need a minimum of volts to open A 8 B 9 5 C 10 5 D 12 69 When checking propane valve coils for resistance a good coil should have a resistance of ohms A 1 5 B 5 10 C 10 30 D 30 50 70 The process of removing sediment from the bottom of a water tank is called A purging B flushing C sanitizing D recycling 71 Weeping or dripping of the P amp T relief valve while the water heater is operating usually means the P amp T relief valve needs replacement the air pocket in the water tank
28. any exist in accordance with the service manual Evaluate proper air flow Did the candidate Open all discharge registers and any closeable registers see installation and or service manual for requirements Verify air discharge by feel or using an air speed indicator Verify that the discharge is warm Accurately diagnose and repair problems if any exist in accordance with the service manual Evaluate return air flow Did the candidate Verify proper return air opening size see installation and or installation manual Accurately diagnose and repair problems if any exist in accordance with the service manual RVIA 11 27 2011 43 of 51 Sign off sheet revised June 23 2008 Appendix 1 Signoff Sheets Troubleshooting Key Furnace Electrical Components Sign Off Sheet Printed Technician Name ID Number Address Telephone Number City State Zip Code STEP Troubleshoot Key Furnace Electrical Components Did the candidate verify sequence of operation per the service manual to evaluate the following components Thermostat Did the candidate Verify proper height and location per installation and or service manual Verify voltage to thermostat and voltage out of thermostat to furnace see service manual On Off Switch Did the candidate Remove power wires and check switch for continuity using an ohmmeter Accurately diagnose and repair problems if any exi
29. calcium deposits reestablish air pocket in tank f Check fittings on tank g Inspect replace water tank h Perform function test 39 Repair replace install water heaters Hydronic Clogged orifice issues Replace orifice Clean burner chamber Clean electric eye Replace ignition valve Repair replace pumps Check and replace heating element Water flow problems Winterize Test replace mixing valve Verify use proper coolant 40 Troubleshoot water heater problems Troubleshoot won t light Troubleshoot tepid water G Troubleshoot won t stay light J KQ o gt 3 x w 5 3 KQ alio o jv w o RVIA 11 27 2011 6 of 51 d Troubleshoot TPR temperature pressure relief valve leaks no air pocket e Troubleshoot won t heat on AC 42 Install repair replace furnaces Pilot a Verify gas pressure b Verify voltage and all grounds c Inspect clean burner pilot exhaust tube and air intake Troubleshoot sequence of operation and repair replace various d components manual shut off valve circuit breaker on off switch pilot assembly thermocouple thermopile gas valve thermostat burner gaskets orifices main burner and pilot fan motor fan switch relay time delay thermostat relay limit switch sail switch Piezo ignitor and electrode b
30. ce rating are identified by color weight measuring size stamped ID number oomp When trouble shooting a poorly functioning cooktop burner first check the A burner alignment B air shutter C propane pressure D appliance regulator RVIA 11 27 2011 35 of 51 Answer Key for Practice Questions 001 002 003 004 005 006 007 008 009 010 011 012 013 014 015 016 017 018 019 020 021 022 023 024 025 026 027 028 029 030 031 032 033 034 035 036 037 038 039 040 041 042 POWFWOFPAOANDNDUVAFWDOFWDVFOONODFUVUDOFOWFUAWVINIFVININIOONOSD RVIA 11 27 2011 043 044 045 046 047 048 049 050 051 052 053 054 055 056 057 058 059 060 061 062 063 064 065 066 067 068 069 070 071 072 073 074 075 076 077 078 079 080 081 082 083 084 NOONOFDDWDWOVONOFSFWUVVUDWDVNOOFVNNOSFSFVOVFSFWDWUVUBDVWOIFSFAOIOFWOWDA 085 086 087 088 089 090 091 092 093 094 095 096 097 098 099 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 POODFUVUVUDFUDWVVODFSFSFWWDVBDVOVVOFOFVOIFWDVVESFWVUWBVWWYG 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155
31. e air conditioner in the high cool position Allow the air conditioner to run for a minimum of 30 minutes Measure the outdoor ambient temperature Record the compressor rated load amperage RLA printed on the air conditioners rating plate Use the information found in the service manual to calculate correct amperage based on RLA and outdoor temperature Read the compressor amperage with an Ammeter Confirm the measure compressor amperage and calculated amperages are approx equal Accurately diagnose and repair problems if any exist in accordance with the service manual Subtract the supply air temperature from the return air temperature RVIA 11 27 2011 39 of 51 Sign off sheet revised June 23 2008 Appendix 1 Signoff Sheets Troubleshooting Air Conditioner Key Electrical Components Sign Off Sheet Printed Technician Name ID Number Address Telephone Number City State STEP Note Due to product differences the candidate must consult the service manual for individual component specifications procedures and sequence of operation Air Conditioner Compressor Did the candidate Correctly measure compressor amperage Correctly measure resistance of the compressor motor windings Remove all electrical power from the air conditioner remove all wires from the compressor check terminals C amp R C amp S R amp S Measure running voltage at t
32. emonstrate knowledge of gas pressure Demonstrate knowledge of sequence of operation Demonstrate knowledge of voltage problems on some appliances Perform burner adjustments allo jojo oO Sign off Sheet Required Knowledge There are seven sign off sheets associated with the Appliance Specialist You must know how to do each test and in what order the steps are performed The sign off sheets are included in Appendix at the end of this study guide The entire group of 14 sign off sheets can be downloaded from the RV Learning Center s web site www rvlearningcenter com Print the sign off sheets and perform the tests Practice the tests until you are sure that you have thoroughly learned each one Air Conditioning Troubleshooting Air Conditioning Furnace Troubleshooting Key Furnace Electrical Components Water Heater Refrigerator Refrigerator Troubleshooting N O GOR O P Practice Questions PROPANE SYSTEMS 01 When servicing a water heater propane flow downstream of the solenoid valve is determined by performing a System Operating Pressure Test installing a monometer at the pressure tap noting the color of the burner flame taking a pressure reading at the burner outlet Jow 02 Which of his five senses will a technician use to find and verify a leaking propane fitting A Sight B Smell C Touch D Hearing 03 Which test instrument can be used to determine that a
33. ems if any exist in accordance with the service manual Electronic Control Refrigerator verify model and type of electronic control system Note Due to the complexity of control systems see the individual service manual to diagnose the following components Upper Control Board Did the candidate check the upper control board power in and power out Lower Control Board Did the candidate check the lower control board power in and power to appropriate components Heating Element 120 VAC 12 VDC Did the candidate Turn off all AC and DC power to the refrigerator Disconnect all heating element wires RVIA 11 27 2011 50 of 51 Sign off sheet revised June 23 2008 Appendix 1 Signoff Sheets Conduct a resistance test to check for proper resistance per service manual or calculate proper resistance per ohm s law Accurately diagnose and repair problems if any exist in accordance with the service manual Propane Components Either Manual Control Refrigerator Safety Valve Did the candidate check the safety valve by testing it using a known good thermocouple Piezo Igniter Did the candidate depress the Piezo igniter and check for resistance and spark Thermocouple Did the candidate check the thermocouple using a known good safety valve or by measuring for millivolts 13 20 millivolts in accordance with t
34. er is A 9to 14 B 9to 16 C 10 to 12 D 10 to 14 44 For Dometic air conditioner normal operation AC voltage needs to stay within a range of A 100 5 124 B 103 5 126 5 C 110 130 5 D 115 126 5 WATER HEATERS 45 Insufficient millivolt output from the thermocouple may be caused by all of the following except RVIA 11 27 2011 17 of 51 46 47 48 49 50 51 52 A carbon coating B improper positioning C low battery voltage D dirty contact When installing a thermocouple do not over tighten this is a n connection A propane B electrical C plug in D thumb screw A fitting on a water heater control valve is provided for a an A propane pressure test port B auxiliary propane connection C burner orifice cleanout D secondary thermocouple On a D S I water heater the thermostat is located on A inthe gas valve water probe B the inside of the tank C the outside of the tank D the P amp T relief valve The initials E C O on a D S I water heater stand for A Energy Compensated Operation B Electrical Control Override C Energy Cutoff Switch D Electronically Controlled Operation A D S circuit board controls what function Sending spark to the electrode while powering the propane valve Powering the propane valve and thermocouple millivolts Sensing the flame and thermocouple output Water temperature and burner f
35. flow to the control valve is the A limit switch sail switch B C fan switch D thermostat The typical furnace pilot assembly consists of the pilot burner and RVIA 11 27 2011 26 of 51 109 110 111 112 113 114 115 pilot regulator pilot orifice pilot filter None of the above DOWD When troubleshooting a pilot model furnace if the gas valve does not open and the required voltage is present at the valve contacts A check the delivery line pressure at the furnace B replace the gas valve C check the solenoid s of the valve for the proper resistance D check for proper voltage at the wall thermostat If the pilot flame will not stay lit when releasing the manual pilot valve verify the output of the thermocouple check the solenoid s on the gas valve for the proper resistance replace the valve check the LP pressure at the furnace DOWD To test a thermostat on a gravity heater simply measure for the correct A continuity B voltage C current D heat anticipator setting What type of furnace functions by having the blower engaged prior to the burner lighting A Catalytic B Forced air C Gravity D All the above The purpose for having the blower start before lighting the burner is to A reduce the overall amount of LP used B minimize carbon build up on the electrode assembly C purge the combustion chamber of any residual gases
36. he evaporator None of the above DOWD To safely discharge a run capacitor attach the leads of a VOM set to the A lowest AC scale B lowest DC scale C highest AC scale D highest Ohms scale A typical heat strip attachment in working condition will measure about hw many Ohms A 7 5 B 9 5 C 11 5D D 13 The lowest safe operating line voltage for a roof A C is A 103 VAC B 107 VAC C 110 VAC D 112 VAC RVIA 11 27 2011 15 of 51 31 32 33 34 35 36 37 38 When installing a roof A C it is approximately 21 feet from the mounting location to the breaker box What size Romex is required A 10 gauge B 12 gauge C 14 gauge D Any of the above When mounting a wall thermostat be sure it is installed on an inside wall as close to the air conditioner as possible as far away from the furnace as possible near a window about five feet above the floor DOWD 12 VDC is used within a 120 VAC RV air conditioner system A to power a printed circuit board B to power a relay C Both A and B D 12 VDC is never used with a 120 VAC appliance The first step in troubleshooting an A C system that does not work at all is to measure the resistance windings of the compressor test the thermostat verify the incoming 120 VAC measure the ambient temperatures inside and outside the RV DOWD BTU stands for A Bradford Technical University B Bri
37. he proper location on the compressor Accurately diagnose compressor problems if any exist in accordance with the service manual Correctly measure fan motor amperage Air Conditioner Fan Motor Did the candidate Correctly measure resistance of the fan motor windings Remove all electrical power from the air conditioner remove all wires from the fan motor check motor windings for short open or ground see service manual Measure running voltage at the proper location on the fan motor Accurately diagnose and repair fan motor problems if any exist in accordance with the service manual Air Conditioner Capacitor s Did the candidate Properly discharge the capacitor s per the service manual Properly test the capacitor s per the service manual Accurately diagnose and repair capacitor problems if any exist in accordance with the service manual Select either manual thermostat or wall thermostat Manual Thermostat Did the candidate Remove all electrical power from the air conditioner remove all wires from the thermostat check the thermostat with an Ohmmeter Accurately diagnose and repair the thermostat problems if any exist in accordance with the service manual Manual Selector Switch Did the candidate Remove electrical power from the air conditioner remove wires from the switch check the selector switch wi
38. he service manual Electrode Did the candidate visually inspect for cracks in wiring or the ceramic insulator Or Electronic Control Refrigerator Gas Valve Did the candidate Disconnect wires to the gas valve and measure ohm s resistance see service manual Verify propane pressure through the gas valve with a manometer installed at the test port and with the gas valve energized Reigniter Did the candidate Measure 12 VDC at the reigniter Minimum 9 5 VDC see service manual Check ground to the reigniter Electrode Did the candidate Check for cracks in wiring and ceramic covering Verify the electrode has the proper spark gap see service manual Thermocouple Did the candidate measure millivolts with refrigerator operating on propane see service manual for specific readings Orifice Did the candidate verify proper orifice size see service manual Did the candidate accurately diagnose and repair problems if any exist in accordance with the service manual RVIA 11 27 2011 51 of 51 Sign off sheet revised June 23 2008 RVDA The National RV Dealers Association Powered by Dealers RVDA The National RV Dealers Association 3930 University Drive Fairfax VA 22030 2515 Tel 703 591 7130 Fax 703 359 0152 www rvda org RVIA Recreation Vehicle Industry Association 1896 Preston White Drive
39. ice technicians in the industry to staff not only traditional RV dealerships but also those of stand alone service shops and repair centers that are constantly seeking qualified individuals There are many service technicians that open their own mobile RV repair business The bottom line is that all good RV service technicians will always have work even during the toughest of economic times It s been proven serious RVers will never entirely give up their lifestyle They may take shorter less frequent excursions but even when fuel costs approach record highs they will still be using that RV And that s the very reason it is an attractive option to become a professional RV service technician RVST Career Ladder The Service Technician Career Ladder was developed and launched through the combined efforts of the RV Dealer Association RVDA the RV Industry Association RVIA and the Certification Governing Board RVIA 11 27 2011 lof 51 RV Service Technician Master Score on Test All Five Specialties m Optional Paths Certification Certified Test m Specialties Candidate Career Ladder Before the Career Ladder was established there was only one way to become a Certified RV Technician and that was to take and pass a comprehensive certification test With the launch of the Career Ladder there are now two paths to certification There is the traditional path through the existing RV Service Technicia
40. lame size DOWD What material is used in the construction of an Atwood water heater tank A Steel B Porcelain on steel C Aluminum D Copper clad aluminum To bench test an electric thermostat attach the leads of your VOM to the contacts of the thermostat and test for A proper voltage B continuity RVIA 11 27 2011 18 of 51 53 54 55 56 57 58 59 C amp draw D A VOM is not used for this test An accepted method for testing an electric water heater element is to A remove element and energize with 120v B check voltage at the element terminals C apply 120v to element terminals while installed and test water temperature after 20 minutes D perform a resistance test What is the maximum size heating element that can be used on a 15 amp circuit and still meet the NEC electrical code A 1 200 watts B 1 400 watts C 1 500 watts D 1 800 watts An open Energy Cutoff will A allow water to overheat B cause water to never reach full temperature C cutoff propane flow allowing electrical operation only D shutdown the water heater completely A defective electric heating element would indicated by A High voltage at the terminals with low amperage draw B Voltage at the terminals but no amperage draw C Low voltage at the terminals with high amperage draw D No voltage at the terminals On a pilot model water heater which component does not
41. liance Specialist level Each section begins with the Duties which will list the main topics covered The Duties are followed by the activities a specialist must be able to perform in each area This list was developed by working technicians educators and subject matter experts from across the country and will provide a valuable check list of what to study for the test It should be noted that the number of questions in each area may not equal the number of tasks listed Some of the tasks are complex and broad in scope and may be covered by several questions Other tasks are simple and narrow in scope and one question may cover several tasks The main objective in listing the tasks is to describe accurately what is done on the job not to make each task correspond to a particular test question The Appliance Specialist Standards Chart begins on page 4 Sample questions will follow Although these same questions will not appear on actual tests they are in the same format and cover the same topics as the actual test questions Resource list The following resources are available to help you prepare for the Appliance Specialist Test The RVIA Textbooks and publications are available through the RVIA Store at www rvia org RV Propane Systems RVIA Textbook RV Electrical Systems RVIA Textbook RV Air Conditioners RVIA Textbook RV Refrigerators RVIA Textbook RV Water Heaters RVIA Textbook RV Ranges and Cooktops RVIA Te
42. lower wheel combustion wheel intake air blower combustion air hose wire and connections e Check integrity of combustion chamber with CO detector f Perform function test 43 Diagnose repair replace furnaces DSI a Verify gas pressure b Verify voltage and all grounds Cc Inspect clean burner exhaust tube and air intake Troubleshoot sequence of operation and repair replace various d components manual shut off valve circuit breaker on off switch gas valve thermostat burner gaskets orifices main burner fan motor polarity fan switch relay time delay thermostat relay limit switch sail switch RVIA 11 27 2011 Tof 51 blower wheel combustion wheel intake air blower combustion air hose electrode assembly DSI module board wire and connections e Check integrity of combustion chamber with CO detector f Perform function test g Verify DSI board shuts fan motor off new style 44 Inspect and correct ducting and return air a Verify amount of ducting ducting area and static pressure to mfg specs b Check for restrictions damaged ducts air flow loose improper connections Check adjustable outlets to mfg specs Verify return air area to mfg specs Verify alignment seal at plenum Measure voltage at furnace under
43. lve ECO Did the candidate remove the thermocouple and measure for continuity Pilot assembly RVIA 11 27 2011 46 of 51 Sign off sheet revised June 23 2008 Appendix 1 Signoff Sheets Did the candidate check the pilot for proper flame see service manual Thermocouple Did the candidate measure millivolts in heated state 12 millivolts Burner Did the candidate check for blockage at the orifice DSI Control Switch Did the candidate Determine proper 12 VDC and ground to switch Verify proper wiring refer to service manual Thermostat Did the candidate test for voltage to thermostat or ECO Circuit Board Did the candidate check for power to the circuit board from thermostat ECO Gas Valve Did the candidate Check for power coming from board ECO Disconnect power source and measure ohms on coils on valve refer to service manual Electrode Did the candidate Check for proper gap refer to service manual Check for spark at proper point on electrode Visually inspect the electrode wire Burner SE Did the candidate Inspect burner for proper flame and adjust as necessary see service manual Accurately diagnose and repair problems if any exist in accordance with the service manual Electric Control Switch Did the candidate test for
44. mber size 86 What event causes the blower motor to begin operating A Burner ignition B Thermostat calls for heat C Sail switch closes D Combustion wheel draws in exterior air 87 Residual gases in the combustion chamber are removed before the burner ignites by RVIA 11 27 2011 23 of 51 88 89 90 91 92 93 94 closing the gas valve running the blower motor the time delay relay diverting room air through the combustion chamber DOWD A millivolt meter is used to test a A blower motor B TDR C ECO D thermocouple A ohmmeter issue to test a A thermocouple B thermostat C heat exchanger D ignition electrode The component that moves fresh air into the combustion chamber is the circulating fan combustion air wheel heat anticipator intake vent DODD A increase in blower speed and decrease in blower motor amp draw is caused by A air cavitation caused by blocked ducts B missing air filter C incorrect heat anticipator setting D defective circuit board Which component is not in the propane delivery system of a D S I furnace A Orifice B Manifold C Pressure tap D Gas cock Primary and secondary air refer to combustion and circulation intake and exhaust circulation from normal and high blower speed levels air mixed with gas and air use for combustion DOWD Which component prevents furnace ignition
45. micro switches shut off arm mold thermostat ice ejector mold heater water lines and connections condenser coil condenser fan motor wire harnesses and connectors on off switch i Perform function test 49 Troubleshoot refrigerator problems a Check installation and venting b Check power supply c Verify propane pressure d Refrigerator freezes or overcooling e Poor cooling performance 50 Install repair replace ranges and cooktops Verify gas pressure Verify grate clips installed Check lines and fittings for proper clearances from heat sources Repair replace components oven thermostat burners burner tubes oven safety valve regulator Piezo igniter and electrode ignition system DSI pilot assembly gaskets window door glass burner valves and manifolds thermocouple new models Verify range burners not affected by operation of forced air furnace or other e appliances e g microwave f Perform function test verify accuracy of oven thermostat g Verify proper installation per code and mfg specifications ajo jojo RVIA 11 27 2011 10 of 51 clearances to adjacent surfaces and flammables do not run a hose as supply line inside burner box 51 Demonstrate general knowledge of appliance repair Demonstrate knowledge of module board operation D
46. n Certification Test and an alternate path through achieving Specialty Certifications The certification process begins with the Candidate level which provides a basic orientation to the RV Service Technician career Next comes the Registered Technician level where the core knowledge of propane basic electrical and other skills are mastered The technician can then move on to one of two paths He can choose to take the comprehensive test which covers all subjects required for certification or master certification or he can choose to move through the individual specialties e Appliances e Body e Chassis e Electrical Systems e Plumbing Once a technician holds all five Specialties or passes the full certification test at the master level and meets the time in service requirement he becomes a Master Certified RV Technician What You Must Know to Pass the RV Appliance Certified Specialist Test The curriculum for the RV Appliance Specialist begins with the DACUM Chart Job and Task Analysis This document outlines all the Duties Tasks and Steps a Specialist is expected to know The DACUM is also known as the RV Service Technician Standard and is further broken down to align with the levels of the RVST Career Path RVIA 11 27 2011 2 of 51 This study guide is focused on the Appliance Specialist level of the Career Path The Appliance Specialist Chart lists all of the Duties Tasks and Steps associated with the App
47. nch C 1 8 inch D the width of the cabinet braces Correct energy source priority for a Norcold automatic refrigerator is 120 VAC 12 VDC LP 12 VDC LP 120 VAC LP 120 VAC 12 VDC 120 VAC LP 12 VDC DOM gt Correct energy source priority for a Dometic automatic refrigerator is 120 VAC 12 VDC LP 12 VDC LP 120 VAC LP 120 VAC 12 VDC 120 VAC LP 12 VDC Jow The absorption refrigerator cooling unit consists of the following components A boiler condenser motor and absorber B boiler condenser evaporator and absorber C boiler motor evaporator and absorber D motor condenser evaporator and absorber Hydrogen Gas has a maximum pressure of PSI when heated A 400 B 500 C 600 D 750 An excessive amount of heat in the cooling unit will cause A the water to vaporize B the hydrogen gas to vaporize C both the hydrogen and ammonia to vaporize D both the water and ammonia to vaporize requires the refrigerator to be installed in such a manner as to provide complete separation of the combustion system and the interior atmosphere of the RV A NFPA 1192 CSA Z240 B Manufacturer installation instruction C NEC 501C UL 14 5 RVIA 11 27 2011 32 of 51 150 151 152 153 154 155 156 D UL 14 5 NEC The proper voltage operating range of a 120 VAC 60 Hz refrigerator is A 108 132 VAC B 108 121 VAC C 102 138 VAC D 102 121 VAC
48. ng 6 f Complete proper documentation of test results Troubleshoot propane system faults Diagnose and Repair erratic propane pressure Locate and remove debris and oil in line if possible Diagnose and Repair low propane pressure allo jojo Diagnose and Repair high propane pressure Diagnose and Repair restricted flow in propane system Diagnose and Repair container filling problems Q Diagnose and Repair container refrigeration situation 34 F APPLIANCES Repair replace install air conditioning heat pump units a Verify air flow Clean coils and air filter Verify ducting system per mfg specs size outlets duct static pressure sq inches etc b Assess integrity of electrical system Verify incoming voltage static and loaded Verify amp draw Verify connections tight and proper wiring Diagnose replace electrical components selector switch thermostat control board main board relay board PTCR device or kit or start relay start capacitor run capacitor s motor s overload protector compressor heat strip assembly cold control change over thermostat ambient sensor relay s reversing valve wire harnesses and connectors Evaluate integrity of refrigerant systems Inspect remove and replace coils Check for leaks Diagnose replace compressor Accessing brazing and leak detection Evacuate dehydration
49. o refrigerator leak test Accurately diagnose and repair installation problems if any exist in accordance with the installation instructions Evaluate Refrigerator Performance Measure propane pressure at refrigerator Did the candidate Turn the propane off at the container Install a manometer at the provided pressure test port Turn propane back on at the container Measure for proper propane pressure see service manual Accurately diagnose and repair problems if any exist in accordance with the service manual Measure incoming 12 VDC at refrigerator Did the candidate Measure incoming VDC at refrigerator DC terminal block 10 5 14 5 VDC per manufacturer s specification Accurately diagnose and repair problems if any exist in accordance with the service manual Measure 120 VAC at refrigerator Did the candidate Measure incoming VAC 108 132 VAC per manufacturer s specification at the receptacle Measure AC voltage at control board or selector switch RVIA 11 27 2011 48 of 51 Sign off sheet revised June 23 2008 Appendix 1 Signoff Sheets Verify the adequacy of the voltage readings Accurately diagnose and repair problems if any exist in accordance with the service manual Perform run test 12 24 hrs Did the candidate Put a thermometer in 1 gallon of water and run the refrigerator for 12 24 hour
50. proper voltage to switch ECO Did the candidate test for power from switch Thermostat Did the candidate test for power from ECO Heating Element Did the candidate Test for power from thermostat Did the candidate disconnect power to heating element and perform an ohms test see service manual Accurately diagnose and repair problems if any exist in accordance with the service manual RVIA 11 27 2011 47 of 51 Sign off sheet revised June 23 2008 Appendix 1 Signoff Sheets Refrigerator Sign Off Sheet Printed Technician Name ID Number Address Telephone Number City State Zip Code STEP Initials Date Install or Verify the Accuracy of a Refrigerator s Installation The candidate must describe and record these characteristics of a refrigerator Did the candidate Record the refrigerator model number Record the refrigerator serial number Verify the refrigerator s type of control system The candidate must confirm the proper installation of arefrigerator Did the candidate Confirm proper side top and rear clearances Confirm proper venting per service or installation manual i e bottom upper side or roof vent Confirm the refrigerator compartment is properly sealed from interior of coach see service or installation manual Verify wiring complies to NEC code Verify proper propane connection t
51. red circuit on the circuit board D the TDR In any forced air furnace the resulting products of proper combustion are never mixed with air inside the RV because A owners are directed to close those vents during operation RVIA 11 27 2011 25 of 51 102 103 104 105 106 107 108 B the circuit board typically monitors and controls this process automatically C of the design of the sealed combustion chamber coupled with the flow of air through a heat exchanger D there are two combustion chambers one intake and one exhaust With a proper heat anticipator setting the furnace should cycle how many times per hour on average once the system has operated for a few hours A 2 3 times B 3 4 times C 4 5 times D 5 6 times Another name for a thermopile is A thermocouple B thermal unit C Thermostat D pilot generator A sail switch is also called a n A fan switch B fan relay C air prover D limit switch The power source used for the typical modulating gas valve includes A 12 VDC B 120 VAC C Either A or B D Neither A or B The two types of thermostats used in RV heating systems are bi metallic and wall wall and modulating valve modulating and automatic automatic and bi metallic DODD The device which controls the furnace operation by reacting to room temperature and opening and closing a set of contact points which allows current to
52. s thermometer should read 40 43 o F 4 6 o C or less Accurately diagnose and repair problems if any exist in accordance with the service manual RVIA 11 27 2011 49 of 51 Sign off sheet revised June 23 2008 Appendix 1 Signoff Sheets Refrigerator Troubleshooting Key Components Sign Off Sheet Printed Technician Name ID Number Address Telephone Number City State Zip Code STEP Troubleshoot Electrical Components Manual Control Refrigerator Selector Switch Did the candidate Turn off all AC power to the refrigerator Disconnect wiring to the selector switch Perform a continuity test on the selector switch per service manual Accurately diagnose and repair problems if any exist in accordance with the service manual Thermostat Did the candidate Turn off all AC power to the refrigerator Disconnect wiring to the thermostat Perform a continuity test on the thermostat in accordance with the service manual Accurately diagnose and repair problems if any exist in accordance with the service manual Heating Element 120 VAC 12 VDC Did the candidate Turn off all AC and DC power to the refrigerator Disconnect heating element wires Conduct a resistance test to check for proper resistance per service manual or calculate proper resistance per ohm s law Accurately diagnose and repair probl
53. st in accordance with the service manual Circuit Breaker If applicable Did the candidate Measure DC voltage in and out of circuit breaker Accurately diagnose and repair problems if any exist in accordance with the service manual Time Delay Relay if applicable Did the candidate Confirm DC voltage at proper terminals refer to service manual Accurately diagnose and repair problems if any exist in accordance with the service manual Blower Motor Did the candidate Confirm DC voltage to blower motor Measure DC amperage at motor see service manual Accurately diagnose and repair problems if any exist in accordance with the service manual Limit Switch Did the candidate Verify continuity or DC voltage through limit switch Accurately diagnose and repair problems if any exist in accordance with the service manual Sail Switch Did the candidate Verify continuity or DC voltage through sail switch Accurately diagnose and repair problems if any exist in accordance with the service manual RVIA 11 27 2011 44 of 51 Sign off sheet revised June 23 2008 Appendix 1 Signoff Sheets STEP Either Fan Control Circuit Board Verify proper DC voltage to circuit board see manual Initials Date Verify function of circuit board see manual functions Spark DC voltage to gas valve Sense flame
54. th an Ohmmeter RVIA 11 27 2011 Wall Thermostat Did the candidate 40 of 51 Sign off sheet revised June 23 2008 Appendix 1 Signoff Sheets Measure low voltage power into the wall thermostat Measure low voltage power out of the wall thermostat Accurately diagnose and repair thermostat problems if any exist in accordance with the service manual Upper Control Box Assembly Did the candidate Measure low voltage power from the wall thermostat to the control box Measure high voltage power 120VAC out of the upper control box assembly to the rooftop air conditioner Accurately diagnose and repair control box assembly problems if any exist in accordance with the service manual Accurately diagnose and repair selector switch problems if any exist in accordance with the service manual RVIA 11 27 2011 41 of 51 Sign off sheet revised June 23 2008 Appendix 1 Signoff Sheets Furnace Sign Off Sheet Printed Technician Name ID Number Address Telephone Number City State Zip Code STEP Install or Verify the Accuracy of a Furnace s Installation The candidate must describe and record these characteristics of a furnace Did the candidate Record the furnace model number Record the furnace serial number Record the type of furnace system Indicate OEM or Aftermarket installation The candidate must confirm the
55. tish Technical University C Bradford Thermal Unit D British Thermal Unit Refrigerant changes from liquid to low pressure vapor at the evaporator coil condenser coil compressor capillary tube DOW gt Refrigerant changes from a low pressure vapor to a high pressure vapor at the A evaporator coil B condenser coil C Compressor D capillary tube Refrigerant changes from a high pressure vapor to a high pressure liquid at the RVIA 11 27 2011 16 of 51 evaporator coil condenser coil compressor capillary tube DOWD 39 In an air conditioner unit the component in which the heat is absorbed from the living area is evaporator coil condenser coil compressor capillary tube DOWD 40 The main difference between the heating and cooling modes of a heat pump is A the type refrigerant must be changed B the flow of the refrigerant is reversed C power source changes from electricity to propane D There is no difference 41 What are the four selector switches used in the manufacture of RV air conditioners 8 7 6 and 5 position 8 6 4 and 2 position 10 8 6 and 5 position 10 8 6 and 4 position DODD 42 You are checking the compressor When the outside or inside ambient temperature rises the load conditions change and amperage A increases B decreases C remains the same D is shut off 43 The 12 VDC operating range for a Dometic air condition
56. xtbook RV Heat Appliances RVIA Textbook Sign off Sheets Taking the test Get plenty of rest the night before so you will be alert and efficient Arrive early enough to find the building and testing room Be sure to bring your test center admission ticket and current photo I D The proctor will instruct you in filling out the answer booklet if taking the written test or how to log on to the computer if you are taking the on line test Once testing has begun keep track of time Do not spend too long on any single question Be sure to read each question carefully so you understand exactly what is being asked Do not mark answers in the test booklet if taking the written test they must be marked on the answer sheet Your test will not be scored if your answers are not on the answer sheet RVIA 11 27 2011 3 of 51 If a question is difficult mark the answer that you think is correct and put a check by it in the test booklet Computer based tests allow you to do this on screen Then go on to the next question If you finish before time is up you may go back to the question that you have checked It is to your advantage to answer every question Do not leave any answers blank Your score will be based only on the number of correct answers you give RV Appliance Specialist Standards Chart 5 Perform propane system tests c Perform appliance tests appliance functional tests leak test appliance s internal piping tubi
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