ARP Control User Manual v1.2
Contents
1. End Hold Off Period Boiler Temp Drops Display Time 000 Until Temp Drop Restart Heat Source Over Shoot Period Starts Dot1 Dot2 Flash B Restart at the End of Over Shoot Period 2 Press On Off Button Power Off Control Disp ay Toggles Between tr and the Value gt Hold SetUp Button Till Zero Is Viewed Disp ay Toggles Between SP and the Value eg Disp ay Toggles Between OS and the Value gt Hold SetUp Button Change Value From 0 30 C Disp OFS and the Value Disp ay Toggles Between trP and the Value I ay Toggles Between IA Disp 0 ay Toggles Between SP and the Value i Hold SetUp Button Change Value From 10 60 Minutes Disp ay Toggles Between C or F and the Value Disp C H or C L and the Value ay Toggles Between Le Hold SetUp Button until Desired Setting Displayed Disp I ay Toggles Between tO and the Value gt Hold SetUp Button Change Value From 0 30 C Disp I ay Toggles Between tP and the Value Press On Off Button to Power Off Control after AbS has been Displayed Fig 20 ARP Button Flow Chart Store Change Press Display SetUp Buttons Simultaneously StO Displays Release Buttons ARP Contro2. ARP turns back on the heat source Dot1 amp Dot2 will flash for the duration of the Overshoot period If the ARP does not detect an overheat situation during the Overshoot period the control will resume normal operation by displaying the single Dot1 ARP Control User Manual DRAFT v1 2 11 10 2013 2013 ARPC L L C All rights reserved Button Selection amp Modes C ee ARP Control Recording Auto Tune SetUp Mode Mode Mode Mode I I I I Lesen Pres d ae BC Press and Hold Press and Hold isplay Bu ON OFF Button A a en I Momentary Momentarily Press i Press ON OFF Momentarily ON OFF Button moe Ree Bellen Press ON OFF 1 isplays I D LED Briefly Button LED Alternately Displays I Toggles Between EE SPO LED Briefly AtO and the Value Boil Release All Displays Release All T a Buttons At Buttons en Ei I Release All I GE y Control Measures Buttons Push Display Dot1 Boiler I Button to Advance Temperature Control Measures Next Variable LED Display Boiler for Following Boiler Flashes Temperature Sequence Overheat Dot1 LED Display 2 Flashes Dot1 Turn off Heat A Source Display Toggles Between AbS and the Value I Heat Source Hold Off Period Begins Display Shows Hold Off Countdown Time in Minutes 010
3. Identifier LED Fig 16 Typical Dometic or Norcold Wiring ARP Control User Manual DRAFT v1 2 11 10 2013 2013 ARPC L L C All rights reserved 11 12VDC Power Rail Manufactures Controller 12VDC RV Power Supply Norcold High Temperature Twisted Pair 800 F Monitoring Kit Cable Identifier Ground Rail Fig 17 Norcold 1200 Series with High Temp Monitoring Kit 12VDC Power Rail CT Fusel Audible Manufactures Controller DPDT Control Switch D Flashing LED 12VDC RV Power Supply Ground Rail Fig 18 ARP Mounted in Cooling Unit Compartment amp Alarm inside RV OPERATION Dot 1 Dot 2 Dot3 Display US Pat 8056360 8 _ e On Off Display SetUp Optional data collection cable On Off j Display Setup button button button Fig 19 ARP Control Panel ARP Control User Manual DRAFT v1 2 11 10 2013 2013 ARPC L L C All rights reserved 12 7 1 Initialization of the ARP Controller You operate the ARP using the buttons on its front panel Information is displayed using bar and dot LEDs in the display area Once the ARP has been properly installed you must run the ARP Auto Tune function to set the parameters unique to your refrigerator After setting Auto Tune there are two set point methods EZ Set Point Method Control High and the operator adjustable Control Low Set Point Method more on th
4. amp relay works for most applications If higher amperage is needed a 40 amp relay is readily available Fig 13 shows the general ARP relay wiring In addition to wiring your own alarm the relay can be wired to turn off the heat source to the refrigerator using one of three methods as mentioned in section 6 1 An easy method to connect the relay is the following ARP Control User Manual DRAFT v1 2 11 10 2013 ARP Control Power Supply 2 or 3 Amp Fuse Power Supply Relay Bottom View 2013 ARPC L L C All rights reserved 9 Warning Control Interrupt OUT ARP Control Relay Activation 87 Control Interrupt IN Relay Isometric View Fig 13 ARP Relay Terminal Connections 30 is wired to the 12V DC power supply that will be interrupted by the NC relay switch or any supply that is desired to cut power to the manufactures control 85 is wired to the ARP black wire The ARP grounds the relay through this terminal 86 is wired through the fuse to 12VDC power supply A CAUTION The installer must be carful to not reverse the polarity on terminals 85 and 86 The reverse polarity will result in failure of the switching device within the ARP Always test all of the control functions after installation 87a is wired to the 12VDC power supply to the manufactures control which is interrupted when the ARP sense
5. during all modes of operation with the exception of the Set Up mode Press and hold the Display button to show the measured boiler temperature Release the button to turn off the temperature display 7 9 Displaying Circuit Temperature When in ARP Control mode press and hold both the Display and SetUp buttons to show the present circuit temperature Upon releasing the buttons the relay will activate press the SetUp button again to resume ARP Control mode 7 10 Relay Test To test the ARP relay momentarily press the SetUp button while in ARP mode The display will read OFF and the refrigerator and or the heat source will be turned off if the control is functioning properly Press SetUp again to resume normal operation 7 11 Error Message Please see the Troubleshooting Guide for ARP display error messages 7 12 ARP Modes and Button Selection Flow Charts Fig 20 is a flow chart that shows the sequence of button press that the operator would use to place the ARP into a particular mode and then select functions within the selected mode Within this chart are letters that reference the notes which further clarify the operation A When the boiler overheats the ARP turns off the heat source by activation of the relay The display shows the present Hold Off period being counted down in minutes The duration of the Hold Off period is a function of how many times the control has detected an overheat situation B Once the
6. 13 2013 ARPC L L C All rights reserved 13 3 If possible allow the ARP to run in the Auto Tune mode for 24 hours If this is not possible allow Auto Tune to run for at least two refrigeration cycles A refrigeration cycle is when the refrigerator thermostat turns the unit on and then off again as it reaches the refrigerated compartment temperature In hot weather this may not be possible If this is the case it is recommended to freeze a gallon of water to put in the refrigerator then manually turning the refrigerator off for about an hour and then turn it back on for the 2 cycle Note Please see detailed instructions for adjusting the SP variable in the Troubleshooting Guide when it is not possible to allow your refrigerator to be turned off for an extended period of time before setting Auto Tune 4 When you are finished running Auto Tune press the On Off button This will turn off the ARP and save all of the parameters 7 7 ARP Control Mode After running Auto Tune press the On Off button again to turn on the ARP Control mode The ARP automatically defaults to the EZ Set Point Method after Auto Tune At this point you are ready to use the ARP if the operator does not want to change the set point method to C L The ARP is now monitoring the temperature at the sensor location and will open the relay if overheating is detected 7 8 Displaying Boiler Temperature The boiler temperature may be displayed on the LED
7. On Off Display SetUp ARP Control User Manual v1 2 Terms Conditions amp Contact Information This manual is copyrighted by ARPC L L C All rights are reserved This manual may only be reproduced with permission of ARPC L L C This manual is furnished for informational use only and is subject to change without notice This manual does not imply any commitment on the part of ARPC LLC or its business partners ARPC L L C and its business partners assume no responsibility or liability for any error or inaccuracies that may appear in this manual By use of this document for installation and operation of the ARP Control the user is agreeing to the ARPC L L C terms and conditions found in document ARPC LLC License Agreement pdf The document ARPC LLC License Agreement pdf can be downloaded at web address https sites google com site arprvsafer 8 documentation and downloads or please send any request to e mail address below ARPC L L C will supply information in a timely manner ARPrvSafe gmail com CONTENTS SAFETY sanieren 1 1 1 Acronyms and Abbreviallons ueuuneeaen a a 1 1 2 Hazard Informatio N sushi 1 1 3 Work Sale eine ee Hr 1 1 4 Temmels IEdEREdOEENEEEEERCEoNEEEEe 1 1 3 Operation Safety eege ee 1 INTRODUC HON HEEN 1 INSTALLATION nenne 1 3 1 System aler ee 1 3 2 Supplies amp TOONS aus 2 INSTALLATION 1 anne 2 4 1 Mounting the Temperature Sensor nennen 2 INSTALLBTION BONTROLLER ME 6 Ee EE 6 5 2 Inte
8. TD wires are not polarized they may be installed in either position on the sensor please see Fig 1 6 7 Wiring Options The following section uses engineering wiring schematics where the power and ground are shown as rails on top and bottom of the schematic All of the components are between the power rails Please use the ARP Control User Manual DRAFT v1 2 11 10 2013 2013 ARPC L L C All rights reserved 10 manufactures wiring diagram to confirm the numbers to Fig 13 where the numbers for proper connections for a particular the terminals are shown in isometric installation schematic and relay bottom views Fig 15 to 18 is for reference please contact Fig 14 shows a general wiring scheme on technical support with any questions the right of the schematic the relay is shown Please compare the following relay terminal 12VDC Power Rail Control Interrupt OUT 12VDC RV Power Supply Control Interrupt IN Twisted Pair Cable Identifier Ground Rail Fig 14 General Wiring 12VDC Power Rail Fuse2 Optional Rated for Manufactures s Control Manufactures Controller 12VDC RV Power Supply Twisted Pair Cable Identifier Ground Rail Fig 15 Typical Universal Wiring 12VDC Power Rail N Fuse2 Optional Boiler Manufactures SE Housing Thermal Switch I2VDC RV tee Power Supply As E Twisted Pair Flashing Cable
9. cautions in the care use and handling of the ARP 1 3 Work Safely There are many ways to install the ARP Make safety your first priority The installers knowledge skill and ability are important for safely installing the system If you are unsure of your ability to do the installation have a qualified installer do the work INTRODUCTION The ARP is a monitoring device for RV refrigerators The ARP turns off your cooling unit heat source if refrigeration is not taking place The ARP control will automatically attempt to restart your refrigerator five times RV absorption refrigerators work by boiling a fluid mixture that includes water and ammonia The ammonia turns into a gas that rises and separates from the water mixture It then condenses into a liquid that flows through the cooling unit tubing As it does this it absorbs heat thereby cooling the INSTALLATION 3 1 System Components The ARP is not complicated The system has the following components seen in Fig 1 1 4 Terms amp Warnings Symbols Imminent hazards which if not avoided will result in serious injury or death Potential hazards which if not avoided could result in serious injury or death A WARNING A CAUTION Potential hazards which if not avoided could result in minor or moderate injury 1 5 Operation Safety The ARP Control and ARPrvSafe infer that the use and operation of this control can add a level of safety to your absorptio
10. er for audible alarm Radio Shack P N 273 0059 e Red flashing LED for visual alarm Radio Shack P N 276 0056 e LED holder Radio Shack P N 276 0079 e Blower this fan is better suited for controlling heat than the typical muffin fans DELTA P N BFB1012L 2a For refrigerators that have metal boiler housings open the heater access door as seen in Fig 4 To open the door there is a tab that goes into the slot seen in Fig 4 straighten the tab and open the door Once the door clears the heaters push the door up to unlock the lower hinge Now the door can be removed 2b For refrigerators that have foil boiler housing such as the Norcold 1200 pull out the section of insulation inserted with the Norcold recall Please reference the document found at our web site on page 9 Documents and Downloads file Norcold recall documentation 1B01CB9Cd01 pdf ARP Control User Manual DRAFT v1 2 11 10 2013 2013 ARPC L L C All rights reserved Controller Termperature sensor Relay EN 1 On Off Display SetUp Green White RTD Twisted Pair Wire Black ARP Relay White GND Twisted Pair Wire j LX Red White GND kee PS Twisted Pair Wire Fig 1 ARP Control Kit Boiler process tube YYYY l PAE Manufacturer s control unit Enlarged Detail Fig 2 Cutaway of Typical Cooling Unit Installed in RV ARP Control User Manual DRAFT v1 2 11 10 2013 2013 ARPC L L C Al
11. ese modes below 7 2 Button Sequence amp Control Functions Referencing Fig 20 the ARP has three push buttons The On Off button on the left is purely amomentary push button where momentary means to press the button and release it immediately The center Display and right SetUp buttons are used as both momentary and press hold buttons depending on the function desired 7 3 ARP Control Modes The ARP has 4 modes of operation which perform different tasks as follows 1 ARP Control Mode This mode is initiated by momentarily pressing the On Off button Within this mode there are two set point methods described below 2 Recording Mode This mode will not activate the ARP relay if there is a boiler over heat situation This mode is purely for diagnostics This mode is initiated by holding down the center Display button momentarily press the On Off button When the display shows SPO release the Display button 3 Auto Tune Mode Defined below in section 7 6 4 Set Up Mode This mode is for operator adjustments if the user does not want to run the controller using the EZ Set Point Method 7 4 EZ Set Point Method After Auto Tune is complete and the control is in the ARP Control mode the ARP begins detecting excessive boiler temperatures using default parameters When an excessive temperature is reached the ARP opens the relay to turn off power stopping your refrigerator from overheating After an appropriate cool d
12. et returns to zero ne Internal Temperature ABS MAX Not adjustable stored and saved permanently CONCLUSION The ARP monitors the absorption refrigerators boiler temperature and automatically turns on and off the heat source to protect the refrigerator When the ARP is installed and used properly it will extend the life of your refrigerator and save energy
13. from affecting the RTD measurement and insure an accurate measurement of the boiler process tube Fig 5 Install Temperature Sensor Fig 6 Insulate RTD ARP Control User Manual DRAFT v1 2 11 10 2013 2013 ARPC L L C All rights reserved 6 INSTALLATION CONTROLLER 5 1 Location Decide whether you will install the ARP controller inside the living space of the RV or in the exterior access door for the cooling unit Either way works if you like to view the control data frequently you may want it inside If you do not want to run wiring inside the living compartment then the exterior installation may work best for you The general approach to installation is the same regardless of where you decide to mount the components Referencing the figures you will need to locate the following features of your RV refrigeration system e Cooling unit access door louvered door that accesses the rear of the refrigerator e Refrigerator manufacturers control unit e Suitable power supply 5 2 Interior Location Fig 3 is a drawing of the inside view for a typical RV refrigerator installation Please note the black ARP housings which represent possible locations to mount the ARP inside the RV These are some suggestions for mounting locations that have spaces behind them for routing the wires Most Dometic refrigerators have a wiring conduit from inside behind the refrigerator controls to the cooling unit area this makes it possib
14. l User Manual DRAFT v1 2 11 10 2013 2013 ARPC L L C All rights reserved 15 7 13 Set Up Mode Variable Definition The following table is a quick reference for above for the button sequence and the operators using the Set Up mode for fine Troubleshooting Guide starting at section tuning their control Please see Fig 20 6 1 for detailed variable explanations L Display Erz Auto Tune Value SP AtO not operator adjustable set during Auto Tune Session bS Absolute Maximum Boiler Temp SetUp button resets this value to zero LED reads LO Total Trigger Events SetUp button resets this value to zero ED A SetUp button raises this value to a maximum of 30 then Operator Raise Set Point returns to zero SetUp button raises this value to a maximum of 30 then Over Shoot Temp Elevation returns to zero SetUp button raises this value to a maximum of 30 then OFS LED Temp Compensation returns to zero SetUp button changes by a value of 10 minutes to a trP Initial ARP Period min maximum of 60 minutes then returns to zero SetUp button changes by a value of 10 minutes to a Over Shoot Period min maximum of 60 minutes then returns to zero Display Units Celsius or Fahrenheit SetUp button Toggles between Celsius and Fahrenheit C H L SetUp button Toggles between Default High Set Point EZ or C Control High or Control Low or Low Set Point SetUp button raises this value to a maximum of 30 then Internal Temperature Offs
15. l rights reserved 4 Front of refrigerator seen from inside RV Fig 3 Typical Inside View of Refrigerator Installation 3 Push the insulation aside to allow you to identify the various tubes The insulation may also be removed by removing sections to gain access to the tubing inside 4 You will mount the sensor to the boiler process tube This tube is most easily identified by the fact that the electrical heater mount tubes are welded directly to the boiler process tube Most Norcold refrigerators have a flue tube on the back of the boiler tube as viewed looking into the boiler housing Dometic cooling units generally have the flue in front of the process tube The location of the flue tube determines the RTD housing and clip alignment in step 5 As seen in Fig 5 the RTD clip is aligned for a Dometic installation because the clip is to the left of the RTD as seen in this view The Norcold clip is opposite the clip would be to the right as seen in Fig 6 5 Referencing Fig 5 the RTD and clip are shown where the RTD has been supper glued to the clip for ease of installation Note that the wires exiting the RTD housing are aligned away from the center of the clip so that insulation can be placed between the boiler process tube and the RTD wires Note If the clip is glued in the wrong position use Acetone to release the supper glue Do not get Acetone on the wire end of the RTD Fig 4 Boiler Housing with Ope
16. le to mount directly on the refrigerator control panel Once the best location for the controller is decided upon drill the wire routing hole in the interior of the RV Generally a 1 4 hole is adequate Next if needed push a wiring fish tape through the hole to make sure that the wires can be routed successfully to the cooling unit compartment Tip Often removal of the roof vent will allow ease of wiring 5 3 Mount Housing Inside Fig 7 Mount Housing amp Route Wires Fig 7 shows the ARP housing mounted A wire routing hole was drilled in the back of the housing and aligned with the previous section routing hole Then the screws are inserted and the wires are then routed 5 4 Exterior Mounting Fig 8 shows a typical installation where the ARP is installed on the manufactures control box Most of the manufactures controls have 1 4 of clearance between the components inside the box and the outside housing where the ARP is mounted Please remove the cover to the manufactures control and check the clearances if in doubt before drilling any of the screw pilot holes ARP Control User Manual DRAFT v1 2 11 10 2013 2013 ARPC L L C All rights reserved 7 5 5 Mount Housing Exterior Fig 9 shows three 1 4 holes drilled near to the bottom edge of the control housing This allows any water to drain and the wires to be routed as seen in Fig 1 or 8 above WIRING the ARP 6 1 General Information Due to varia
17. n refrigeration system in your RV No other RV absorption refrigerator control monitors the boiler temperature and turns off the heat source to the refrigerator before damage can be done to the internal fluids in the refrigerator cooling unit The ARP cannot prevent RV refrigerator failure if the manufacture built the cooling unit in a manner that would result in premature failure refrigerator RV refrigerators are notoriously unsafe when operated off level or in a variety of temperature and pressure conditions If the boiler in your RV refrigerator overheats the cooling tubes are stressed which may lead to early failure or even a rupture that leads to a fire The ARP monitors the actual boiler temperature of your RV refrigerator to detect conditions that can be unsafe and in turn turn off the boiler heat source to prevent overheating Controller Temperature Sensor RTD Relay Fuse ARP Control User Manual DRAFT v1 2 11 10 2013 2013 ARPC L L C All rights reserved 2 The RTD sensor measures the temperature of the boiler process tube The controller looks at this information and is programmed to send a signal to open the normally closed NC relay when a condition exists that may indicate overheating Depending on the control ordered a variety of functions can be used to interact with the control and its program The control can also gather data that can be stored on your computer system All these features add up to a unive
18. n Heater Access Door ARP Control User Manual DRAFT v1 2 11 10 2013 2013 ARPC L L C All rights reserved 6 Determine the position of the RTD so that it meets the following criteria Sensor e The sensor is touching the boiler process cip tube e The sensor is away from all heat sources ml including the flue tube e The sensor is a least 1 above the electric heating elements preferably 2 to 5 e The maximum height is below the upper Upper absorber coil absorber coil seen in Fig 5 Boiler process Fig 5 shows a typical Dometic installation of tube the ARP RTD The red tube seen in this figure is the gas flue tube make sure the RTD is not in contact with this tube and the RTD is very well insulated from this heat source 7 Once the position of the RTD has been determined either spray silicone lubricant or rub silicone grease on the clip and the boiler tube to aid with step 8 below Snap the RTD around the boiler process tube very near the location you determined 8 Position the RTD to meet the criteria in step 6 above by sliding the RTD from side to side or up and down 9 Repack the insulation you may have moved Pack extra insulation around the sensor and between the sensor and any heat sources such as the flue tube and the electric heaters Referencing Fig 6 pack insulation around the clip and in the direction of the green arrows This will help prevent the flue tube and electric heaters
19. nd wires identified in Fig 1 to the ground of your system You can use the ground screw terminal or another similar ground 3 Verify that the boiler housing is grounded The boiler housing acts as a shield for the ARP sensor This housing should be grounded or the ARP will pick up noise from sources such as the gas SOV valve and the gas igniter This step is not always necessary but is recommended o AEPA 3 s SA Fig 11 Typical Dometic Power Terminals 6 4 Wiring the Power Often the best place to connect the power for the ARP controller is the manufactures control 12VDC input Use the following method to connect the ARP to the power source e SYA 7 Fig 12 Typical Norcold Power Terminals 1 Locate the red wire extending from the ARP housing this wire will go to the fuse Note 1 The fuse is rated at 2 3 amps Note 2 The fuse will also supply power to the relay in the next section 2 Connect the wire from the fuse to the refrigerators 12VDC power supply If you cannot locate the power supply or your system is different contact technical support There are many ways you can power the ARP 6 5 Wiring the Relay The ARP uses a typical automotive type single pole double throw SPDT 30A relay You may use the relay connection to power to a buzzer LED or other device to alert you that the ARP has determine an overheating condition as well as to shut down power to the refrigerator Note A 30
20. own period the ARP signals the relay to close and the normal refrigerator operation resumes As a safety measure the ARP makes 5 attempts to resume normal operation before locking out the restoration of power to the refrigerator device At this point you must resolve the conditions that are causing the boiler to overheat WARNING If the ARP attempts to restore the heat source to your refrigerator and fails the operator must determine if there is an unsafe condition present and remedy the cause of the unsafe condition Turning off the ARP and restarting your refrigerator should be preformed by qualified service personal that are capable of dealing with any issues that may arise 7 5 Control Low Set Point Method This control method is for advanced users that want to fine tune the ARP for their particular refrigerator to achieve its maximum protection The operator must place the ARP into the Set Up mode to activate this set point method Please see Fig 20 and the Troubleshooting Guide for more on this subject 7 6 Auto Tuning Auto Tune must be run the first time the ARP is powered on For most installations Auto Tune will only need to be run once To Auto Tune the ARP perform the following steps 1 Hold down both the Display and Setup buttons and then momentarily press the On Off button to start the Auto Tune mode 2 When the ARP front panel displays At release all buttons ARP Control User Manual DRAFT v1 2 11 10 20
21. rior ET e 6 5 3 Mo ntHo sing Heiden 6 5 4 Exteri r M lhiiNd zen 6 5 5 MOUNT Housing Exterior ncrenesennieree ee ra 7 WIRING TE 7 6 1 General Information BEE 7 6 2 Good Wiring Ge 7 6 3 Wiring the Ground ass 7 6 4 Wiring the Power esse eu 8 6 5 idee 8 6 6 Temperature Sensor Wiring Au 9 67 Winn TONS nee 9 OF BHAT N an ee E E E 11 7 1 Initialization of the ARP Controller 12 7 2 Button Sequence amp Control Funchons e 12 7 3 ARP Control Modes nee ee 12 7 4 EZ Set Point Method a ee 12 7 5 Control Low Set Point Melon a 12 LE AWO TUNING aaa a E E A E A E R E AEE EE EEE AN 12 Ga ARP Control ee E 13 7 8 Displaying Boiler Temperature egenen gees 13 7 9 Displaying Circuit Temperature u 13 740 EE 13 7 11 Eror Message nen ee ee 13 7 12 ARP Modes and Button Selection Flow Charts 13 7 13 Set Up Mode Variable Definition za sc sans RENE 15 CONOLUSION EEN 15 2013 ARPC L L C All rights reserved ARP Control User Manual DRAFT v1 2 11 10 2013 2013 ARPC L L C All rights reserved 1 SAFETY 1 1 Acronyms and Abbreviations ARP ARP Control GND Ground NC Normally Closed Relay Contact NO Normally Opened Relay Contact P N Part Number RTD ARP Control temperature sensor Resistance temperature detector is the type of sensor used 1 2 Hazard Information Hazard information includes terms symbols and instructions used in this manual or on the equipment to alert operating and service personnel to the recommended pre
22. rsal control that is also a powerful diagnostics tool never applied before to RV refrigeration 3 2 Supplies amp Tools Needed supplies for the installation of the ARP e Dielectric Grease or Silicon Grease Walmart or NAPA Auto Parts Sil Glyde e Super Glue e Fiber Glass Insulation Typical Hardware Store High Temp Pipe Wrap Granger Item 4LFD2 McMaster Carr P N 9356K 11 INSTALLATION RTD 4 1 Mounting the Temperature Sensor Fig 2 is a drawing of a typical RV which includes the living space and the refrigerator installation The exterior shell of the RV including the cooling unit access door is removed for ease of viewing This figure gives the installer a general idea of what will be found inside the cooling unit compartment The temperature sensor clips onto the boiler process tube Fig 5 shows a cutaway view of the boiler assembly and the RTD with clip 1 Open the access door to expose the rear of the refrigerator Optional supplies for the installation of the ARP e Cable Clamps Ace Hardware P N PPC 1525 Radio Shack P N 640 3039 e 0 25 Piggy Back Crimp Connector Handy for connection of ARP power supply to Norcold power supplies with standard automotive power supply connectors e Fish Tape To push or pull wires between RV and cooling unit compartment e Optional clips for RTD attachment ACE Hardware Hilman Hardware 58410 e Metal Repair Tape ACE Hardware P N 47523 e Buzz
23. s a boiler overheat situation 87 can optionally be wired to any type of alarm that will inform the operator of an overheat situation more on this subject below When the ARP control activates the normally closed NC relay terminal it opens this circuit turning off the power to the manufacturers refrigerator controller 30 is connected to the power side of the NC switch To connect it locate the 12VDC connection to the manufacturer s refrigerator controller disconnect the wire from the 12VDC source where it connects to the manufacturers refrigerator controller Reconnect this wire to relay terminal 30 Note You may need to protect this circuit with an additional fuse of appropriate size inline with the power supplied to the relay Ensure that all power connections are properly fused 87a is wired so as to supply power through the NC relay connection to the manufactures refrigerator controller The ARP will attempt to restart your refrigerator in most cases before the internal temperature of the refrigerator can rise When the ARP releases the relay it returns to its normally closed position and power is restored to the refrigerator controller so it resumes its typical operation 87a is connected as the load side of the NC switch 6 6 Temperature Sensor Wiring The RTD temperature sensor is connected to the ARP via a green white twisted wire pair Note The white wire of this pair is not a ground wire The R
24. s normal operation Do not disable manufacturer safety devices 6 2 Good Wiring Practices e Always disconnect all power sources before working on any electrical circuit e Make the ground connection first This is important because most circuits use the ground connection for safety and overload prevention e Make the ground connections at a single point whenever possible This helps to avoid ground loops that interfere with digital controls function See Fig 10 6 3 Wiring the Ground ARP Control Burner Housing and SOV Valve Singular Grounding Point 12VDC RV Power Supply Fig 10 Single Grounding Point The RV battery ground should always be the final destination of any grounded circuit in your RV The battery ground is connected to the chassis of the RV You may need to consider how the ground circuit in your RV connects to the battery Grounding requires experience If you are unfamiliar with ground ARP Control User Manual DRAFT v1 2 11 10 2013 2013 ARPC L L C All rights reserved 8 circuits consult our technical support or a professional installer Use the following steps to connect the ground for the ARP 1 Identify the 2 white ground wires extending from the ARP controller They are twisted in pairs with the black and red wires from the ARP 2 Identify the ground location of your refrigerator By viewing Fig 11 amp 12 the typical power and ground terminals are seen Connect the 2 white grou
25. tions in refrigerator design to which you may be adding the ARP the description of how to wire your particular refrigerator may not be listed here If you have any difficulty please contact our technical support Once installed we recommend you periodically test the ARP relay to insure that the ARP and also the manufactures control are operating correctly All absorption RV refrigerators work on similar principles You can connect the ARP control to turn off the heat source of your absorption refrigerator using one of three methods 1 Stop power from reaching the manufacture s refrigerator controller 2 Stop power from reaching the manufactures flame sensor if the refrigerator has a manual control 3 Stop power from reaching the wire going to or from the manufacturer s temperature monitoring device such as the boiler thermo switch or NHTSA type recall kit Note The ARP adds a higher level of safety than most NHTSA kits because the ARP measures boiler temperature and turns off the heat source at a lower temperature to avoid damaging the unit A CAUTION The ARP does not interfere with the NHTSA or other kits provided by the manufactures if and only if the ARP is installed correctly The ARP must be connected so that the NC relay terminal is US Pat 8056360 Fig 9 Drill Drain Wire Routing Holes connected in series with the manufactures safety device allowing the manufactures safety device to perform it
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