norcold repair guide section 5 models 865,866,868bryantrv.com/docs2/docs/8682.pdf · norcold repair...

Norcold Repair GuideModels 865,866,868

Section 5

Table of Contents

Page

5-2 General Information and Specifications

5-2 Operating Limits - All Models

5-2 Ratings

5-3 Electrical Connections - 12 Volts DC

5-3 Electrical Connections - 120 Volts AC

5-4 Description of Operation

5-4 Control Description

5-4 LP Gas Mode

5-4 AC Electric Mode

5-4 DC Electric Mode

5-5 Operating and Lighting Instructions

5-5 Important Information on 12 Volt Operation

5-7 Location of Controls

5-8 Parts Function

5-15 Troubleshooting

5-15 LP Gas Mode of Operation

5-21 AC Electric Mode of Operation

5-26 DC Electric Mode of Operation

5-30 Illustrations of Normal and Abnormal Conditions

5-34 Wiring Diagrams 2-Way, 8662, 8682

5-35 Wiring Diagrams 3-Way, 8663, 8683

5-36 Wiring Diagrams 2-Way, 8652

5-37 Wiring Diagrams 3-Way, 8653

A008

5-1

General Information and Specification

OPERATING LIMITS - ALLMODELS

AC Mode: 132 VAC Max., 108VAC Min.15. 4 VDC Max., 10.5VDC Min.

DC Mode: 15.4 VDC Max., 11.5VDC Min.

Gas Mode: 11" W.C.15.4 VDC Max., 10.5VDC Min.

MODELS 8652, 8653RATINGS

1200 Btu/Hr InputLP Gas Mode:

11" W.C.LP14 Orifice12 Volts DC control voltage

AC Mode:110 Volts AC, 170 Watts12 Volts DC control voltage

DC Mode (3-Way only):12 Volts DC

MODELS 8662, 8663RATINGS





MODELS 8682,8683RATINGS





CURRENT DRAWS - 8652, 8653

Automatic ignition - Less than 250 milliamps or .25 ampsAC Heating Element - 1.5 amps at 110 Volts AC

1.7 amps at 120 Volts ACDC Heating Element - 9.2 amps at 12 Volts DC

10.7 amps at 14 Volts DC

CURRENT DRAWS - 8662, 8663, 8682, 8683

Automatic ignition - Less than 250 milliamps or .25 ampsHumidity Heater - 240 milliamps or .24 ampsInterior Lamp (when door open) - 900 milliamps or .90 ampsAC Heating Element - 2.7 amps at 110 Volts AC

2.9 amps at 120 Volts ACDC Heating Element - 13.8 amps at 12 Volts DC

16.1 amps at 14 Volts DC

OPERATION WHERE THESE SPECIFICATIONS ARE EXCEEDED MAYCAUSE DAMAGE AND WILL VOID REFRIGERATOR WARRANTY.

5-2

Electrical Connections -12 Volt DC

All Norcold refrigerator models requirea 12 volt DC supply (See Figure 5.1). 12Volts DC is required to operate theMode Selector (Eyebrow board) andtemperature control circuits and maintainthe automatic Ignition gas mode. TheDC lead connections (1/4" male quickconnects) are at terminals located on thePower Supply at the rear of the refrigera-tor. One terminal is marked positive (+)and the other negative (-). Correct polar-ity must be observed when connectingto the DC supply. Do not use the chassisor vehicle frame as one of the conduc-tors. Connect two wires between the re-frigerator and the DC supply.

The distance the current must travelfrom the battery to the refrigeratordictates the AWG wire size to beused. Should the wire be too smallfor the distance, a voltage drop willresult. In the case of 3 - way models,the voltage drop affects the wattageoutput of the cartridge heater and re-sultant refrigerator performance. Seethe adjacent wire and fuse chart forthe correct wire and fuse size.

Electrical Connections -120 Volt AC

All Norcold refrigerators are equippedwith a three prong plug for protectionagainst shock hazard (See Figure 5.2).They must be connected into a recog-nized three prong attachment recepta-cle. The cord must be routed so as notto come in contact with the Burner cover,flue pipe, or any other component thatcould damage the cord insulation.

DO NOT REMOVE (CUT) GROUND-ING PRONG FROM THE REFRIG-ERATOR AC POWER CORD. RE-MOVAL OF THIS PRONG CAN RE-SULT IN A SEVERE ELECTRICALSHOCK, AS WELL AS, VOIDING THEREFRIGERATOR ELECTRICAL CER-TIFICATION AND WARRANTY. EX-

TENSION CORDS ARE NOT RECOMMENDED.

Figure 5.2 AC Supply Cord

Figure 5.1 Recommended 12 Volt Connection

5-3

Operation

Control Description

Models 865, 866 and 868 requirethat 12 volt DC be connected toterminals J-4 (-) and J-5 (+) of thePower Supply board located at therear bottom left of the refrigerator.The 12 volts DC is necessary forthe refrigerator to work on eitherLP GAS or electric operation. The12 volt power is then routedthrough the 3 amp fuse, locatedon the Power Supply board, thento the interior light and HIGH HU-MIDITY circuit. A resistor, R3, actsto limit the maximum amount ofcurrent through the cable and Eye-brow circuit.

Note:When defective, the temperature

control circuit (Thermistor) can causethe food storage cabinet to over-freeze. The same result will occurwhen the Thermistor is disconnectedfrom the Eyebrow board.

When the wiring harness is plug-ged in, the +12 volt DC is reducedto 5.6 Volts DC by a zener diodeD12 or D13 located on the Eye-brow board. This 5.6 Volts DC isthe control voltage for the tem-perature control circuit.

Gas Mode

When the Mode Selector switchis set to LP, the indicator lamp willilluminate and 12 volts DC will besent to the Ignition Module. Whenthe Ignition Module receives 12Volts DC, the Ignition Module willopen the gas solenoid valve, al-lowing gas to flow to the Burner.The Ignition Module will then sendenergy to the Ignition electrode tospark the Burner.

If the flame is established the Ig-nition Module will sense the flamethrough the Sense electrode, andcease the sparking at the Burner.

If ignition did not occur after the trial for ignition, the Ignition Module willstop sparking and automatically close the gas valve. The Ignition Modulewill then send 12 Volt power to the Eyebrow board and illuminate the Red(X) CHECK lamp indicating ignition failure.

AC Mode

120 Volts AC is supplied to the Power Supply on terminals J-9 and J-10 bythe AC power cord when it is plugged into an active AC receptacle.

The neutral side of the AC J-9 is tied directly to terminal J-8 of the PowerSupply and to the AC heater when connected.

The hot side is routed through a 5 amp fuse to the normally open contactof relay (K-1). The relay is energized by the 12 volt control voltage from theTemperature Control circuit.

When the Mode Selector switch is set to AC ELEC, the temperature con-trol circuit will complete the circuit of relay (K-1) coil and the relay contactswill close. The hot side of the 120 Volts AC will be applied through the relaycontacts to the AC heater terminal J-7.

DC Mode (Three Way Models Only)

When 12 Volts DC is supplied to terminals J-4 (ground) and J-5 (+ 12Volts DC) of the Power Supply, the power is routed directly to the normallyopen contact of relay (K-2) and through the 3 AMP fuse to the storageswitch for the interior light and HIGH HUMIDITY circuits, then to the coil ofrelay (K-2). The 12 Volt power is routed through the wiring harness to theEyebrow board.

The zener diode (D-12) or (D-13) on the Eyebrow board reduces the 12Volts DC to 5.6 Volts DC, which is the control voltage within temperaturecontrol circuit.

When the Mode Selector switch is set to DC ELEC, it completes the circuitto the coil of relay (K-2), the relay contact closes, and 12 Volts DC is ap-plied to terminal J-6 of the Power Supply.

Current then flows through the 20 AMP fuse and on the DC heater.

Note:DC operation will not initially cool down the refrigerator. The initial cooling

must be done in either the GAS or AC modes. Trying to cool down the re-frigerator in the DC mode will result in no cooling and battery run down.

5-4

Figure 5.3

Figure 5.4

5-5

IMPORTANT INFORMA-TION ON 12 VOLT DCOPERATION (3-Waymodels Only)

The 12 volt DC mode is not de-signed for continuous DC opera-tion - only for short "intransit" peri-ods when gas or AC sources arenot available.

The 12 volt DC mode cannot beused for the initial pull-down of therefrigerator compartment(s). Theinitial cooling operation must bedone in either the GAS or ACmodes. The refrigerator must becooled and stabilized before theDC operation is effective.

Good battery condition is essen-tial when operating on DC. This

implies an adequate recharging means which can handle the demands ofthe refrigerator along with other loads.

The wires from the battery to the refrigerator must be of large enough size tohandle the load. The connections must be clean, tight and free from corrosion.If not, a resulting voltage drop will cause a decreased cooling capacity.

The following points regarding the DC operation should be considered:a. Operate the refrigerator in the DC mode only in periods when AC or

GAS operation is unavailable.b. The DC operation is designed to operate during a short "hold over" pe-

riod, such as a four (4) to six (6) hour period while in transit. The refrig-erator should not be switched to the DC mode if the food is not com-pletely chilled.

c. Good battery condition is essential when operating on DC. This impliesan adequate recharging means which can handle the demands of therefrigerator along with other loads.

d. The wire from the battery to the refrigerator must be of large enoughsize to handle the load. The connections must be clean, tight and freefrom corrosion. If not, a resulting voltage drop will cause a decreasedcooling capacity.

Figure 5.5

Figure 5.6

5-6

Location of ControlsModels 865, 866, 868

Figure 5.7 Front View - Typical 2 Door Model

5-7

Parts and Their Function

High Humidity Switch andInterior Light Switch

Turning the HIGH HUMIDITYswitch to ON will keep the surfacebetween the door openings dryduring high humidity conditions.The switch should be left in OFFposition unless condensation isobserved in this area.

Note:During times when the refrigera-

tor is not in use (storage) theHIGH HUMIDITY switch must bein the OFF position. If the switchremains in the ON position, a con-tinuous amp draw may occur, andresult in battery run down.

The interior light switch turns onthe light when the door is opened(two door models only) See sec-tion about power supplies.

Power Supply Board

There are three versions of thePower Supply board

1. The original version Power Sup-ply board had a storage switchlocated on the left side of theboard. The storage switch elimi-nates all 12 volt DC to the refrig-erator when in OFF (up) posi-tion. A transformer was on theboard which allowed the refrig-erator to operate on AC without12 volt DC being applied.

Note:On refrigerators with the "original

version" Power Supply board, thestorage switch must be in the ON(down) position in order to allowthe refrigerator to operate in theGAS or DC mode and to allow theinterior light and HIGH HUMIDITYcircuit to operate. When the stor-age switch is in the OFF (up) posi-tion the refrigerator will operate inthe AC electric mode, but not Gasor DC Modes.

Figure 5.8 Light, Humidity Switch

Figure 5.9 Power Supply Board - Original Version

5-8

See the identification of PowerSupply versions below.

2. On the second version of thePower Supply board, the stor-age switch and the trans-former were removed. Whenthis occurred, a 12 Volt DCsupply was required for opera-tion in all modes.

Note: On refrigerators with the "second

version" Power Supply board, the12 volt DC must be disconnectedfrom the Power Supply board toeliminate a constant current drawof 15 to 20 milliamps. Failure todisconnect the 12 volt DC, (duringtimes which refrigerator is not inuse (storage), can cause batteryrun down.


3. On the third version of thePower Supply board 12 voltDC must be supplied in orderfor the refrigerator to operatein any mode. The "storageswitch" was added back to theboard but the switch itself willnot totally eliminate the 12 voltDC to the refrigerator when inthe OFF (up) position.

Note:The storage switch will eliminate

current to the interior light andHIGH HUMIDITY circuit only. Toeliminate current draw, turn thestorage switch and the Mode Se-lector switch to the OFF position.For added protection against bat-tery run down, disconnect the 12volt DC from the Power Supplyboard.


Power Supply Versions by Model & Serial Number

Figure 5.11 Power Supply Board - Third Version

Figure 5.10 Power Supply Board - Second Version

5-9

Power Supply Board Function

In response to the Mode Selectionat the Eyebrow, the Power Supplyoutputs power to operate the refrig-erator in the proper mode:

1. 12 volts DC to the Eyebrowboard through the cable.

2. 12 volts DC to the IgnitionModule when LP is selected.

3. 12 volts DC to the DC heater(3 way only) when DC is se-lected.

4. 12 volts DC to the interior lightand High Humidity heater.

5. 120 volts to the AC heaterwhen AC is selected.

Cable

Connects the Power Supply tothe Eyebrow Board.

Eyebrow Board

Selects the mode of operation(owners choice), indicates themode of operation determines theoperating temperature, and indi-cates when a trial for ignition fails.

Note:On some Eyebrow Boards, the

AC Indicator light will illuminateeven though AC is not connected.However, the refrigerator cannotcool in this mode without AC beingconnected. Also, a red light maybe visible at times through theThermostat slide opening; this lightis for Production testing only. Thisinformation applies to the followingmodels: Use this information as aguide.

Model Beginning Serial# Date8652 001201 10-02-878653 001098 9-23-878662 012093 8-25-878663 008090 8-26-878682 008380 8-27-878683 009061 8-25-87

Figure 5.12 Cable

Figure 5.13 Eyebrow Board

5-10

Ignition Module

Used only during GAS operation,and does the following:

1. Supplies 12 volt DC to openthe gas valve.

2. Supplies power to the Ignitionelectrode to ignite the Burner.

3. Senses the flame through theSense electrode.

4. When the Burner ignites andstays lit, the Ignition Moduleturns off the spark.

5. When the Burner does not ig-nite, or it ignites and goes outwhen the sparking stops, theIgnition Module will close thegas valve, turning off the gassupply to the Burner, and illu-minate the red CHECK light.

Gas Valve Assembly

The gas solenoid valve openswhen 12 volts is supplied andcloses when the 12 volts is re-moved. When it is open LP gaswill flow to the Burner.

The manual shut-off valve allowsthe gas supply to be turned off tothe refrigerator.

Orifice

Applies the correct amount of LPgas to the Burner provided themain line pressure is correct.

Figure 5.14 Ignition Module

Figure 5.15 Gas Valve Assembly

Figure 5.16 Burner Orifice

5-11

Burner

Applies heat to the cooling unitwhen it has the correct amount ofLP gas and air.

Ignition Electrode

Sparks the Burner to ignite theflame when supplied with energyfrom the Ignition Module.

Sense Electrode

Senses the heat of the flame andtells the Ignition Module if a flameis present or not.

Figure 5.17 Burner

Figure 5.18 Ignition Electrode

Figure 5.19 Sense Electrode

5-12

AC Heating Element

Applies specific amount of heatto the cooling unit, providing 120volts AC is present to the refrig-erator.

DC Heating Element

Applies specific amount of heatto the cooling unit, providing theDC input voltage is correct. TheDC Heating Element does nothave the capability to cool the re-frigerator from an initial start, buthas the capability to maintain thetemperature for a short duration.

Figure 5.20 Illustration of Heater Types

Figure 5.21 DC Heater (current)

5-13

Thermistor

Senses the temperature of the re-frigerator interior and changes theresistance to the temperature sens-ing circuit telling the refrigeratorwhen to turn off and on.

Figure 5.22a Type A Thermistor

Figure 5.22c Type C Thermistor And It’s Fin Location

Figure 5.22b Type B Thermistor

5-14

Troubleshooting

IMPORTANT:The trouble shooting procedures

which follow require that each checkbe performed in sequence. Conclu-sions made at any point in the pro-cedure presumes that all precedingsteps have been followed.

Problem Solving Steps -LP Gas Operation

Answer these questions beforecalling Norcold’s Technical Number.

1. Is the refrigerator installed andvented in accordance withNorcold’s Product Specifica-tion. See Section 1.

2. Is the refrigerator being operatedin a comfortably level position?

3. Do you have 11" water columnpressure (LP pressure tap point, lo-cated at the rear of the refrigerator,at the 12V solenoid valve?

4. Is the combustion chamber whichhouses the spiral baffle clean andfree from obstruction?

5. Is the spiral baffle in place?6. Is the Burner Orifice clean and

the correct size?7. Have you checked all electri-

cal connections?8. Is 12 Volts DC being supplied to

terminals (J-4) ground and (+J-5)?9. Is 3 amp fuse good? (Located un-

der Power Supply board Cover)10. Is storage switch located on

the Power Supply board in the"On" position?

11. Is the modular connector onthe wire harness connected atthe Power Supply board andthe Eyebrow board?

12. Is Mode Selector set to LP?

Step by Step TroubleShooting Guide L/P GASMode Of Operation

1. Check the 12 volt DC input to thePower Supply as shown in Fig-ure 5.23. Refrigerator must have12 Volts to operate in any mode.

DC OPERATION: USE EXTREME CAUTION WHEN REPLACING ANYDC ELECTRICAL COMPONENTS, CAUTION MUST BE TAKEN WHENDISCONNECTING THE DC SUPPLY. THE DC SUPPLY IS CLOSE TOTHE PROPANE GAS SUPPLY TO THE REFRIGERATOR. ARCING CANEXIT WHEN DISCONNECTING THE DC SUPPLY WHICH CAN IGNITE ALEAK IN THE PROPANE SUPPLY LINE. RESULTS CAN BE SEVEREELECTRIC SHOCK OR DEATH.

Figure 5.23 12 Volt DC Supply Check

Figure 5.24 3 Amp Fuse Check

5-15

2. Remove the wire connectionsfrom the Power Supply terminals.

3. Disconnect the cable from thePower Supply.

4. Remove the Power Supplycover to gain access to thePower Supply.

5. Reconnect the DC supply wiresto terminals J-4(-) and J-5(+).

6. Check for 12 volts DC at the 3amp fuse as shown in Figure5.24.

7. If you do not have 12 volts as

shown. Replace the 3 ampfuse.

NEVER OVERFUSE A CIRCUIT.REPLACE BLOWN FUSE WITHEXACT REPLACEMENT INDICAT-ED BY NORCOLD. OVERFUSINGOF A CIRCUIT CAN RESULT IN AFIRE.

8. Reconnect the cable to thePower Supply. Set the ModeSelector to OFF as shown inFigure 5.29.

9. Be sure the storage switch isin the down position as shownin Figure 5.25. (original andthird versions)

10. Using the volt meter, check for12 volts DC at the locations 1,2, 3 shown in Figure 5.26.

11. If you do not have 12 volts(10.5 Volts min.), replace thePower Supply.

Note:A two way Power Supply will not

have the D-4 diode, and the origi-nal version diodes will be D-6 andD-7.

12. Remove the screws shown inFigure 5.27, and pull the Eye-brow assembly away from therefrigerator as shown.

Figure 5.25 Storage Switch Location

Figure 5.26 12 Volt DC Voltage Check

Figure 5.27 Eyebrow Removal

5-16

13. Remove the Eyebrow boardfrom the Eyebrow shown inFigure 5.28.

14. Do not disconnect the cable orThermistor wire.

15. Set the Mode Selector switchto the OFF position as shownby Figure 5.29.

Note:These checks cannot be per-

formed unless the Eyebrow Boardhas the L.E.D. as shown.

16. Connect a volt meter asshown in Figure 5.29.

17. You should measure 12 VoltsDC (10.5 Volts min.) at theemitter of Q11.

18. If you do not have 12 volts, re-place the cable.

19. Set the Mode Selector toGAS. The voltage should nowdrop to 5-7 volts DC.

20. If it does not, replace the Eye-brow board.

21. Set the Mode Selector switchto OFF.

22. With the volt meters negativelead connected as shown inFigure 5.29, check the switchterminals shown in Figure 5.30.

23. There must be 12 volts on allthe terminals shown. If you donot have 12 volts the cable isdefective and must be replaced.

24. Set the Mode Selector to GasMode. With the Volt meternegative lead connected asshown in Figure 5.29, checkPoint A shown in Figure 5.30.You should measure approxi-mately .5 Volts DC. If not, re-place the Eyebrow Board.

Figure 5.28 Eyebrow Board Removal

Figure 5.29 12 Volt Check On Eyebrow Board

Figure 5.30 Control Voltage Check

5-17

25. With Mode Selector still set toGas Mode, check for 12 VoltsDC at the connector betweenthe Power Supply board andIgnition Module (first wire fromleft) as shown in Figure 5.31.If you do not have 12 volts, re-place the Power Supply.

26. If you have 12 volts and thegas solenoid valve did notopen or the Ignition electrodedid not spark the Burner, pro-ceed to next step.

27. Check for 12 Volts DC acrossthe terminals of the gas valve.If 12 volts (10.5 volts min.) ispresent and the valve did notopen, replace the valve. If wir-ing is proper and 12 Volts(10.5 Volts min) is not present,replace the Ignition Module.

Note:The valve will only have 12 volts

when the flame is burning or dur-ing a trial for ignition.

28. If the Ignition electrode did notsend sparks to the Burner,check the electrode wire forcontinuity as shown in Figure5.33. If Electrode wire showscontinuity, proceed to next step.

Figure 5.31 12 Volt Check At Ignition Module

Figure 5.32 12 Volt Check At Gas Valve

Figure 5.33 Continuity Check Of Electrode Wire

5-18

29. Check the alignment of theelectrodes as shown in Figure5.34.

30. Check for a loose wire con-nection at the electrodes andIgnition Module. If all checksare proper and still no spark atBurner, proceed to next step.

31. Check the Sense and Ignitionelectrodes shown in Figure5.35 for a short to ground.A. Turn the Mode Selector to

OFF.B. Set the Volt-Ohm-meter to

the Rx10K scaleC. Disconnect the wires to the

electrodesD. Check the continuity to

groundE. Any needle movement indi-

cates a defective electrodeand it must be replaced.

32. Reconnect the electrodes andset the Mode Selector back togas.

33. Make sure the main line LPgas is on as shown in Figure5.36.

Figure 5.35 Electrode Grounding Check

Figure 5.36 Main Gas Valve Check

Figure 5.34 Proper Spark Gaps

5-19

34. Check the manual shut-offvalve shown in Figure 5.37 tobe sure it is in the ON position.

35. Check the Burner and Orificeshown in Figure 5.38 for anyobstructions.

36. Check the main line gas pres-sure (See gas pressure sec-tion) for 11" WC.

37. Check for corrosion on thepins of the Ignition Module asshown in Figure 5.39. Cleanthe pins with an eraser.

38. If the flame will not light andstay lit replace the IgnitionModule.

Figure 5.37 Manual Valve (alternate versions)

Figure 5.38 Burner Assembly

Figure 5.39 Edge Connector Visual Inspection

5-20

Problem Solving Steps -AC Electric Operation

Answer these questions before callingNorcold’s Technical Service Number.

1. Is the refrigerator installed andvented in accordance with Nor-cold Product Specification. SeeSection 1.

2. Is the refrigerator being operatedin a comfortably level position?

3. Is the refrigerator plugged intoAC power?

4. Do you have 12 Volts DC power toterminals (J-4) ground and (+ J-5)?

5. Do you have 12 Volts DCacross the 3 amp fuse?

6. Do you have 120 Volts ACacross the 5 amp fuse?

7. Did you check for loose wireconnections or pinched wires?

8. Is the modular connector on thewire harness (cable) pluggedinto the Power Supply boardand the Eyebrow board?

9. Is the Mode Selector set to ACELEC?

10. Is the AC heater element theproper voltage and wattage?

Step by Step TroubleShooting Guide - AC Elec-tric Mode of Operation

AC OPERATION: USE EXTREMECAUTION WHEN WORKING ONTHE AC ELECTRICAL COMPO-NENTS OF THE REFRIGERATOR.BEFORE REPLACING ANY ELEC-TRICAL COMPONENTS, DISCON-NECT THE AC POWER SOURCETO THE REFRIGERATOR. ELEC-TRICAL VOLTAGES CAUSE SE-VERE INJURY AND DEATH.

1. Check the 120 volt AC supplyas shown in Figure 5.40.

2. Check for 120 volts AC acrossthe power cord as shown inFigure 5.41. If you do not have120 volts the power cord mustbe replaced.

Figure 5.40 120 Volt AC Supply Check

Figure 5.41 120 Volt AC Check At Power Cord

5-21

3. Check the 12 volt DC input toterminals J4 and J5 as shownin Figure 5.42. If you do nothave +12 volts, repair the 12volt supply.

4. Remove the cable from thePower Supply shown in Figure5.43.

5. Remove all the wires from theterminals on the Power Sup-ply.


7. Reinstall the AC and DC in-puts to their terminals on thePower Supply.

8. Check for 120 volts across the5 amp fuse as shown by Fig-ure 5.44.

9. You should have 120 volts asshown. If you do not have 120volts, replace the 5 amp fuse.

NEVER OVERFUSE A CIRCUIT.REPLACE BLOWN FUSE WITHEXACT REPLACEMENT INDI-CATED BY NORCOLD. OVER-FUSING OF A CIRCUIT CAN RE-SULT IN A FIRE.


Figure 5.43 Power Supply


5-22

10. Check the 3 amp fuse asshown in Figure 5.45. To besure you have 12 volts DCacross it. If you do not have 12volts, replace the 3 amp fuse.


11. With the volt meter set tomeasure DC, check Points 1,2 and 3 shown in Figure 5.46for 12 volts DC. If you do nothave 12 volts, replace thePower Supply.

Note:Be sure the storage switch is in

the down position "On" and re-member that the diodes will benumbered D6 and D7 on the origi-nal power supplies.

12. Reconnect the cable to thePower Supply.

13. Remove the screws shown inFigure 5.47 and pull the Eye-brow assembly away from therefrigerator.



Figure 5.46 12 Volt DC Check

5-23

14. Remove the Eyebrow boardfrom the Eyebrow as shownby Figure 5.48.



formed unless the Eyebrow boardhas the LED as shown.


17. You should measure 12V DCat the emitter of Q11. If 12volts is not indicated, replacethe wire harness.

18. Set the Mode Selector to gas,the voltage should now drop to5.6 volts DC. If it does not, re-place the Eyebrow board.

19. Set the Mode Selector switchto OFF.

20. With the volt meter’s negativelead at D12, as shown in Figure5.49, check the switch terminalsshown in Figure 5.50.

21. You must have 12 volts on allthe terminals shown. If you donot have 12 volts the cable is de-fective and must be replaced.

22. Set the Mode Selector switch(es) to AC ELECTRIC Mode.Use the Volt meter (with nega-tive lead still connected per Fig-ure 5.49) and check Points B, Dand E as shown in Figure 5.50.You should measure approxi-mately 2 Volts DC. If not, re-place the Eyebrow Board.




5-24

23. Check for 120 volts AC on ter-minals J-7 and J-8 of thePower Supply as shown byFigure 5.51. If you do notmeasure 120 volts, replacethe Power Supply.

24. If 120 Volts AC is present,check resistance of AC Heaterelement as shown in Figure5.52. If not within the allowablespecification (see TechnicalData section), replace with oneof the correct size and wattage.

AC & DC Supply connectedbut not shown.

Figure 5.51 120 Volt Output Check

Standard Heater(early version)

Horizontal Burner Type(current version)

Two Black Leads

Figure 5.52 Heater Resistance Check

B101

5-25

Problem solving steps -DC Electric Operation

Answer these questions beforecalling Norcold’s Technical ServiceNumber.

1. Remember this mode of op-eration is not designed to coolthe refrigerator.

2. Do you have 12 Volts DC to ter-minals (J-4) ground and (+J-5)?

3. Is the 3 amp fuse (located un-der the Power Supply boardcover) good?

4. Do you have 12 Volts DC tothe 20 (15) amp fuse?

5. Did you check for loose wireconnections?

6. Is the modular connector on thewire harness (cable) pluggedinto the Power Supply boardand the Eyebrow board?

7. Is the Mode Selector set to theDC mode of operation?

Step by Step TroubleShooting Guide - DC Elec-tric Mode of Operation

1. Check for 12 volt DC at termi-nals J4 and J5+ on the PowerSupply as shown by Figure 5.53.If +12 volts is not present, repairthe 12 volt supply.

2. Remove the wires from thePower Supply terminals.

3. Disconnect the cable from thePower Supply.


5. Reconnect the 12 volt wires toterminals J4 and J5+.

6. Check for 12 volts DC asshown in Figure 5.54. If youdo not have 12 volts replacethe 3 amp fuse.

NEVER OVERFUSE A CIRCUIT. REPLACE BLOWN FUSE WITH EXACTREPLACEMENT INDICATED BY NORCOLD. OVERFUSING OF A CIR-CUIT CAN RESULT IN A FIRE.



5-26

7. Check the three places indi-cated by Figure 5.55 for 12volts. If you do not have 12volts as shown replace thePower Supply.

Note:On the original version Power

Supply the diodes will be markedD6 and D7 and the storage switchmust be in the down position "ON".

8. Reconnect the cable to thePower Supply.

9. Remove the screws shown inFigure 5.56 and pull the Eye-brow assembly away from therefrigerator.

10. Remove the Eyebrow boardfrom the Eyebrow as shownby Figure 5.57.



Figure 5.55 12 Volt DC Circuit Check

5-27



formed unless the Eyebrow boardhas the led as shown.


13. You should measure 12 VoltsDC at the emitter of Q11.A. If you do not have 12 volts,

replace the wire harness.14. Set the Mode Selector to gas.

The voltage should now dropto 5.6 volts DC. If it does not,replace the Eyebrow board.

15. Set the Mode Selector switchto off.

16. WWith the voltmeter’s negativelead connected as shown inFigure 5.58, check the switchterminals shown in Figure 5.59.

17. YYou must have 12 volts on allthe terminals shown. If you donot have 12 volts the cable isdefective and must be replaced.

18. Set the Mode Selectorswitch(es) to DC ELECTRICMode. Use the volt meter (withnegative lead still connected perFigure 5.58) to check Points B,C and D as shown in Figure5.59. You should measure ap-proximately 2 volts DC. If not, re-place the Eyebrow Board.

19. Set the Mode Selector to DCELEC.

20. Check the DC heater termi-nals on the Power Supply for12 volts as shown in Figure5.60. J-3 is -, J-6 is +. If 12volts is not measured, replacethe Power Supply.



Figure 5.60 12 Volt DC Output Check

5-28

21. Check for 12 volts across theDC heater fuse as shown byFigure 5.61. If 12 volts is notmeasured, the fuse is blownand must be replaced.


22. If 12 Volts DC is present, checkresistance of the DC Heaterelement as shown in Figure5.62. If not within allowable speci-fication (see Technical Datasection), replace heater.

Standard Heater(early version)

Horizontal Burner Type(current version)

Blue and White Leads

Figure 5.62 Heater Resistance Check

Figure 5.61 DC Heater Fuse Check

WARNING

B101

5-29

Illustrations Showing Normal and Abnormal Conditions of the Mode Selector

Normal Condition

Mode Selector set to GAS, LPlight illuminated, and refrigeratoroperating on gas.

Normal Condition

Mode Selector set to AC ELEC,AC light illuminated, and refrigera-tor operating on AC.

Normal Condition

Mode Selector set to DC ELEC,DC light illuminated, and refrigera-tor operating on DC

Figure 5.63

Figure 5.64

Figure 5.65

5-30

Abnormal condition

Mode Selector set to gas, LP andCHECK light illuminated. Refrig-erator will not light the Burner, orthe Burner lights for a few secondsand goes out.

Probable Cause:A. Low input voltageB. LP turned off at main tank

or shut-off valveC. LP pressure not adjusted

correctlyD. Air in the LP gas linesE. Gas valve did not openF. No sparks to the BurnerG. Electrodes not adjusted cor-

rectlyH. Orifice & Burner obstructedI. Loose or corroded connec-

tionJ. Defective Ignition Module

Abnormal condition

Mode Selector set to gas, LP andCHECK light Illuminated, and theFlame is Burning

Probable Cause:A. Low input voltageB. Corrosion in the cable con-

nectorsC. Moisture on the Eyebrow

boardD. Defective Ignition ModuleE. Defective cable

Abnormal Condition

Mode Selector set to AC ELEC,AC and CHECK lights are illumi-nated.

Probable Cause:A. Defective fluorescent light

(1) Turn off all fluorescentlights. If the CHECKlight goes out, one of thefluorescent lights is de-fective.

(2) Replace the light or wirethe refrigerators 12 voltDC input to the battery

B. Corrosion in the cable con-nectors

C. Defective Power SupplyD. Defective cable

Figure 5.66

Figure 5.67

5-31

Abnormal Condition

Mode Selector set to off, CHECKlight illuminated.

Probable Cause:A. Defective fluorescent light

(see probable cause onpage 5-31)

B. Defective Power SupplyC. Corrosion in cable connec-

torsD. Defective cable

Abnormal Condition

Mode Selector set to GAS, LPlight is not illuminated, refrigeratorworking on gas

Cause: Defective Eyebrow board

Abnormal Condition

Mode Selector set to GAS, LPlight is illuminated, the flame didnot light, and the CHECK light isnot illuminated

Probable Cause:A. Defective Eyebrow boardB. Defective Ignition ModuleC. Defective cable

Figure 5.68

Figure 5.69

Figure 5.70

B101

5-32

Abnormal Condition

Mode Selector set to AC ELEC,AC light is not illuminated, refrig-erator working on AC.


Abnormal Condition

Mode Selector set to DC ELEC,DC light is not illuminated, refrig-erator working on DC.


Abnormal Condition

A. Mode Selector set to off, nolights illuminated refrigeratoroperating on DC

Cause: Defective Power Supply

B. Mode Selector set to off, re-frigerator operating on AC

Cause: Defective Power Supply

C. Mode Selector set to off, re-frigerator operating on LP gas

Cause: Defective Power Supplyor the gas value is hungin the open position

Figure 5.71

Figure 5.72

Figure 5.73

5-33

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