Henny Penny AHC-993 Technical Manual
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Henny Penny AHC-993 Technical Manual

Humidified holding cabinets with automatic water fill
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Henny Penny
Humidified Holding Cabinets
With Automatic Water Fill
Model AHC-993
Model AHC-990
TECHNICAL MANUAL

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Summary of Contents for Henny Penny AHC-993

  • Page 1 Henny Penny Humidified Holding Cabinets With Automatic Water Fill Model AHC-993 Model AHC-990 TECHNICAL MANUAL...

  • Page 4: Table Of Contents

    Model AHC-990/993 TABLE OF CONTENTS Section Page Section 1. TROUBLESHOOTING 1-1. Introduction ......................... 1-1. Safety ........................... 1-3. Troubleshooting ......................1-4. Error Codes and Warnings ................... 1-5. Info Mode ........................Section 2. LEVEL 2 PROGRAMMING 2-1. Introduction ......................... 2-2. Tech Mode ........................2-3.

  • Page 5: Section 1. Troubleshooting

    Model AHC-990/993 SECTION 1. TROUBLESHOOTING This section provides troubleshooting information in the form 1-1. INTRODUCTION of an easy to read table. If a problem occurs during the first operation of a cabinet, recheck the installation per the Installation Section of the Op- erator’s Manual Before troubleshooting, always recheck the operation proce- dures in the Operator’s Manual.
  • Page 6 Model AHC-990/993 1-3. TROUBLESHOOTING (continued) Problem Cause Correction OPERATION A. Product not • Doors left open • Keep doors closed except holding temperature to load and serve product • Product held too long • Hold product only for recommended times •...
  • Page 7 Model AHC-990/993 1-3. TROUBLESHOOTING (continued) Problem Cause Correction OPERATION (Continued) C. Product dry • Bad float switch • Replace float switch • Bad water heater high limit • Replace high limit • Bad water heater • Check heater and replace if bad; see Tech Mode item 18 •...
  • Page 8 Model AHC-990/993 1-3. TROUBLESHOOTING (continued) Problem Cause Correction HEATING SYSTEM (Continued) C. Unit Overheating • Blower not working • Check blower and replace if bad (“E-5”) See Tech Mode item 18 • Bad control board • Replace control board • Relay stuck closed •...

  • Page 9: Error Codes And Warnings

    Model AHC-990/993 1-4. ERROR CODES AND The display shows the following error codes and warnings when a fault is detected, along with an alarm sound. Both the heat and WARNINGS humidity systems shut down, except when specified otherwise. Display Cause Panel Board Correction “E-4 CPU TOO HOT”...
  • Page 10 Model AHC-990/993 1-4. ERROR CODES AND WARNINGS (Continued) Display Cause Panel Board Correction • Turn switch to OFF position, then back to “E-6B AIR TEMP SENSOR • Faulty air temperature ON; if the display shows “E-6”, the FAILED SHORTED” probe temperature probe should be checked;...
  • Page 11 “CALL SERVICE, WATER • Faulty relay or heater • Check heater relay and heater HEATER FAILURE” “PURGE” Unit is purging humidity No correcting action needed. If message continues, contact the Henny Penny Tech- nical Support Line at 1-800-417-8405 March 2014...

  • Page 12: Info Mode

    Model AHC-990/993 1-5. INFO MODE This mode records historic information on the holding cabinet and operator performance, which could help in troubleshooting a problem. This mode records historic information on the unit and operator performance. Press at the same time and “*INFO MODE*”...
  • Page 13 Model AHC-990/993 1-5. INFO MODE (Continued) Press to continue to P-LOG. 2. P-LOG (power-up log) Press and “A. (time) *NOW*” shows in display. This is the present date and time. Press and the latest power-up is shown, “B. (date, time,) PWR-UP”.
  • Page 14 Model AHC-990/993 1-5. INFO MODE (Continued) 5. CPU TMP This step shows the present PC board temperature. Press to continue to the Cabinet Air TMP. 6. CABINET AIR TMP This step shows the present air temperature inside the cabinet. Press to continue to the Water Heater TMP.

  • Page 15: Section 2. Level 2 Programming

    Model AHC-990/993 SECTION 2. LEVEL 2 PROGRAMMING The Tech Mode and Stats Mode in the Level 2 Programming, 2-1. INTRODUCTION have information that could help in troubleshooting a problem with the unit. 2-2. TECH MODE Press and hold until “L-2 LEVEL 2”, followed by, “CLOCK SET”, shows in display.
  • Page 16 Press and hold the button. The software revision level is displayed. T-2: Cabinet Version This section shows the model number, e.i. AHC-993. T3: Push Button Test Press any button on the control and a digital display feedback confirms the button is working.
  • Page 17 Model AHC-990/993 2-2. TECH MODE (Continued) T10: Air Temperature - Calibration/Offset/Highest This is a user calibration to make sure the display shows the actual air temperature. Press and hold and use to set the display to match the actual temperature. (+/-15 Press and hold to change the amount of the offset.
  • Page 18 T19: Total Initialization This completely resets any accumulated information and changed settings in the controls. Contact Henny Penny before completing this step. Feb. 2011...

  • Page 19: Stats Mode

    Model AHC-990/993 Press and hold until “L-2 LEVEL 2”, followed by, 2-3. STATS MODE “CLOCK SET”, shows in display. Press 4 times and “STATS”, followed by, “ENTER CODE” shows in display. Enter code, to access the following items: (Use hidden buttons, see Section 3-3.) ST-1 Power live hours ST-2 Power ‘on’...
  • Page 20 Model AHC-990/993 2-3. STATS MODE (Continued) ST-1: Power Live Hours This section shows the number of hours the control has been ST-2: Power On Hours This section shows the number of hours the control has been ST-3: Power Ups Count This section shows the number of times the control has been turned on.
  • Page 21 Model AHC-990/993 2-3. STATS MODE (Continued) ST-13: Highest Water Heater Temperature This section shows the highest water heater temperature, sensed by the water heater temperature sensor. ST-14: Highest Food Temperature Factory use. ST-15: Highest Humidity Value This section shows the highest humidity value sensed by the humidity sensor.

  • Page 22: Data Logging And Manufacturing Mode

    Mode. Press and hold for 3 seconds. 2-4. DATA LOGGING AND The Data Logging and Manufacturing Mode are mainly for Henny Penny use only. For more information on these modes, MANUFACTURING contact the Service Department at 1-800-417- 8405, or 1-937- MODE 456-8405.

  • Page 23: Section 3. Maintenance

    Model AHC-990/993 SECTION 3. MAINTENANCE 3-1. INTRODUCTION This section provides procedures for the checkout and re- placement of the various parts used within the merchandiser. Before replacing any parts, refer to the Troubleshooting Sec- tion. It will aid you in determining the cause of the malfunc- tion.
  • Page 24 A calibration board is supplied with each control kit and humidity sensor kit, but can also be ordered separately under part number 14391. AHC-993 ONLY (AHC-990 continue onto step 12) 1. Unscrew the silver cap from humidity sensor. 2. Remove the two pronged sensor by grasping the edges.
  • Page 25 Model AHC-990/993 6. Using the timer buttons, (Figure 3-5), enter code of 3-3. HUMIDITY SENSOR CALIBRATION AND 11221122. (Hidden buttons 1 through 5 left to right) REPLACEMENT (Contd.) Figure 3-5 7. Press to step through menu to “HUMIDITY--CIRCUIT CAL. 8. Insert the two prongs of the calibration board marked 20% into the humidity sensor.

  • Page 26: Power Switch Replacement

    Model AHC-990/993 3-4. POWER SWITCH REPLACEMENT To avoid electrical shock or property damage, move the POWER switch to OFF and disconnect main circuit breaker, or unplug cord at wall receptacle. 1. Using a Phillip’s head screwdriver, remove the four screws securing the front panel.

  • Page 27: Air Temperature Probe Replacement

    Model AHC-990/993 3-5. AIR TEMPERATURE PROBE REPLACEMENT To avoid electrical shock or property damage, move the POWER switch to OFF and disconnect main circuit breaker, or unplug cord at wall receptacle. 1. Using a Phillip’s head screwdriver, remove the four screws securing the front panel.
  • Page 28 Model AHC-990/993 RTD Resistance Chart Feb. 2011...

  • Page 29: Transformer Replacement

    Model AHC-990/993 3-6. TRANSFORMER REPLACEMENT To avoid electrical shock or property damage, move the POWER switch to OFF and disconnect main circuit breaker, or unplug cord at wall receptacle. 1. Using a Phillip’s head screwdriver, remove the four screws securing the front panel. 2.

  • Page 30: Relay Replacement

    Model AHC-990/993 3-7. RELAY REPLACEMENT To avoid electrical shock or property damage, move the POWER switch to OFF and disconnect main circuit breaker, or unplug cord at wall receptacle. Checkout: 1. Using a Phillip’s head screwdriver, remove the four screws securing the front panel.

  • Page 31: Module Top Removal

    Model AHC-990/993 3-7. RELAY REPLACEMENT (Continued) 7. Label wires and then remove wires from relay using a Phillip’s head screwdriver. Figure 3-1. 8. Using a Phillip’s head screwdriver, remove the 2 screws securing the relay and remove relay from unit. Figure 3-2. 9.

  • Page 32: Cooling Fan Replacement

    Model AHC-990/993 3-9. COOLING FAN REPLACEMENT To avoid electrical shock or property damage, move the POWER switch to OFF and disconnect main circuit breaker, or unplug cord at wall receptacle. 1. Remove module top per paragraph 3-10. Figure 3-1 2. Unplug connectors to the cooling fan. Figure 3-1. 3.

  • Page 33: Blower Motor Replacement

    Model AHC-990/993 3-11. BLOWER MOTOR REPLACEMENT To avoid electrical shock or property damage, move the POWER switch to OFF and disconnect main circuit breaker, or unplug cord at wall receptacle. 1. Remove module top per paragraph 3-10. 2. Unplug wires to blower motor. Figure 3-1. Figure 3-1 3.

  • Page 34: Air Heater Replacement

    Model AHC-990/993 3-12. AIR HEATER REPLACEMENT To avoid electrical shock or property damage, move the POWER switch to OFF and disconnect main circuit breaker, or unplug cord at wall receptacle. 1. Remove module top per paragraph 3-10. 2. Disconnect the wires to the and high limit. Figure 3-1. 3.

  • Page 35: Complete Panel Or Pc Board Replacement

    Model AHC-990/993 3-14. COMPLETE PANEL OR PC BOARD REPLACEMENT To avoid electrical shock or property damage, move the POWER switch to OFF and disconnect main circuit breaker, or unplug cord at wall receptacle. The complete control panel assembly can be replaced, or just the PC board.

  • Page 36: Float Switch Replacement

    Model AHC-990/993 3-15. FLOAT SWITCH REPLACEMENT To avoid electrical shock or property damage, move the POWER switch to OFF and disconnect main circuit breaker, or unplug cord at wall receptacle. 1. While wearing heat resistant gloves or using a grasping tool, remove overflow tube and allow water to drain from pan.

  • Page 37: High Limit - Water Heater Replacement

    Model AHC-990/993 3-16. HIGH LIMIT - WATER HEATER REPLACEMENT To avoid electrical shock or property damage, move the POWER switch to OFF and disconnect main circuit breaker, or unplug cord at wall receptacle. 1. While wearing heat resistant gloves or using a grasping tool, remove overflow tube and allow water to drain from pan.

  • Page 38: Water Pan Heater Replacement

    Model AHC-990/993 3-17. WATER PAN HEATER REPLACEMENT Make sure unit voltage matches the water heater voltage in kit, or damage to the water heater could result. To avoid electrical shock or property damage, move the POWER switch to OFF and disconnect main circuit breaker, or unplug cord at wall receptacle.
  • Page 39 Model AHC-990/993 3-17. WATER HEATER REPLACEMENT 7. Remove the nuts securing the water heater plate and pull (Continued) heater plate, insulation, water pan heater, and aluminum plate from the unit, and discard plate and insulation. Figure 3-6. If using kits 140167, 140168 or 140169 and unit already has the lug heater (heater wires secured w/screw &...
  • Page 40 Model AHC-990/993 3-17. WATER PAN HEATER 1. Place new cover plate from the kit, over the insulation, aligning REPLACEMENT the notch with the nut on the heater. Figure 11. (Kits 140167, (Continued) 140168 or 140169 won’t have new plate. Unit should already have notched plate.) Figure 3-10.

  • Page 41: Solenoid Valve And Water Strainer Replacement

    Model AHC-990/993 Enter code, 3-17. WATER PAN HEATER REPLACEMENT (Continued) Press until “DO TOTAL INIT” shows in the display. Press and hold until the display counts down from 3, and the display flashes “-INIT-” then “INIT*DONE”. ready Press and hold to exit programming and unit is now for use.

  • Page 42: Door Gasket Replacement

    Model AHC-990/993 3-19. DOOR GASKET 1. Pull the gasket to the side to expose the retainer screws. REPLACEMENT Figure 3-1. 2. Loosen the screws around the outside perimeter of the gasket. 3. With all the screws loose, the gasket should slide out from under the retainers.

  • Page 43: Vent Motor Microswitch Replacement

    Model AHC-990/993 3-21. VENT MOTOR MICROSWITCH REPLACEMENT To avoid electrical shock or property damage, move the POWER switch to OFF and disconnect main circuit breaker, or unplug cord at wall receptacle. 1. Remove module top per paragraph 3-10. 2. Label and pull the wire connectors from the microswitch. Figure 3-1.
  • Page 44 Model AHC-990/993 3-22. AHC-993 FLIP DOOR REPLACEMENT 94184 94182 Door Assy. Door Assy. w/extrusion-top w/cams-top 94185 94183 Door Assy. Door Assy. w/extrusion- w/cams-bottom bottom Flip Door Removal 1. Using door latch, open door assembly. Using both hands, pull back on cam on one end of flip door hinge.
  • Page 45 5. Locate tube of spindle lube (part no. 12124) supplied with doors and place a small amount of lube on each cam. Continue to place spindle lube on ALL AHC-993 flip door cams in store. This will significantly increase the life of the cams.
  • Page 46 (upper and lower for a 990). 4. Remove all four (4) doors from the 990 cabinets. For AHC-993, only remove the two (2) whole doors form the hinges. Do not remove the flip doors. 5. For AHC-990, using two people, lay the unit on its side.
  • Page 47 13. Using a 11/32” socket, remove all nuts that secure the water pan to the underside of the unit. 14. Remove water pan from unit. It is Henny Penny’s recommendation to replace the water pan gasket while performing this procedure.
  • Page 48 Model AHC-990/993 3-23. WATER PAN REPLACEMENT 15. With the water pan off, all the componants need removed and (continued) installed on the new water pan. 16. Using a 3/8” socket or wrench, remove the drain block. Remove the gasket. Install on the new water pan. 17.
  • Page 49 Model AHC-990/993 Feb. 2011 3-27...
  • Page 50 Model AHC-990/993 27485 120V-60hz-1ph • Dashed lines indicate control module can be wired for either auto ventilation control or auto water fill • Transformer: connect wire #20 to primary wire Aug. 2013 3-28...
  • Page 51 Model AHC-990/993 27486 200-240V-50/60hz-1ph • Transformer: connect wire #20 to the appropriate primary wire (208 or 240V) March 2011 3-29...
  • Page 52 Model AHC-990/993 March 2011 3-30...

  • Page 53: Section 4. Parts Information

    Model AHC-990/993 SECTION 4. PARTS INFORMATION 4-1. INTRODUCTION This section lists the replaceable parts of the Henny Penny AHC-993 and AHC-990. 4-2. GENUINE PARTS Use only genuine Henny Penny parts in your cabinet. Using a part of lesser quality or substitute design may result in damage to the unit, or personal injury.
  • Page 54 Model AHC-990/993 Quantity Item No. Part No. Description AHC-993 AHC-990 B 1 63419 Speaker Assembly A 2 63460 Transformer Assembly - 120V Pri.-24 Sec. A 3 40645 Relay - 25A - Solid State 93847 Terminal Block Assembly B 5...
  • Page 55 Model AHC-990/993 AHC-990 Floor Model Item No. Part No. Description Quantity B 1 140165 Kit - Control Board A 2 63464 Power Switch 90730 Decal - Control AHC-990 14272 Kit - Door Handle 154616-003 Assy - AHC-990 Glass Door - RH Top 154616-004 Assy - AHC-990 Glass Door - RH Bottom 154616-001...
  • Page 56 B 1 140166 Kit - Control Board SN: DC1011048 & After 63464 Power Switch 89360 Decal - Control AHC-993 14272 Kit - Door Handle 87198 Assy-Door-Flip-RH-1/3 Size (Parts breakdown on next page) 87934 Assy-Door-Flip-LH-1/3 Size (Parts breakdown on next page)
  • Page 57 Model AHC-990/993 AHC-993 Countertop Model Item No. Part No. Description Qty Per Door 87198 Assy-Door-Flip Complete - RH-1/3 Size 87934 Assy-Door-Flip Complete - LH-1/3 Size B 2 94182 Assy-Flip Door-Top w/Cams 94184 Assy-Flip Door-Top w/Extrusion only 94183 Assy-Flip Door-Bottom w/Cams...
  • Page 58 Power Cord 120V 20AMP 72532 Power Cord Assembly - 120/30A TWIST LK- AHC-990/993 A 2 64126 Air Heater Assy-600W-120V (includes 63815 gasket) - AHC-993 A 2 64127 Air Heater Assy-900W-120V (includes 63815 gasket) - AHC-990 B 3 63360 Fan Blade - 5-3/8”...
  • Page 59 Model AHC-990/993 Item No. Part No. Description Quantity A 1 140135 Kit -AHC-993 Humidity Sensor 140212 Kit -AHC-990 Humidity Sensor EF02-124 Strain Relief A 3 81673 Probe-Air Temp A 4* 14391 Kit - Calibration Board 59383 Assy - Sensor Housing and Bracket Recommend Parts: A=Truck Stock/B=Dist.
  • Page 60 Model AHC-990/993 ALL UNITS BUILT BEFORE JAN. 1, 2012 UNITS BUILT AFTER JAN. 1, 2012 Model AHC-993 Model AHC-990 Feb. 2014...
  • Page 61 Flow Valve - 1/4 - Female - Ball (All units after 1/1/2012) 64154 Check Valve (993’s before 03/01/2011 & All 990’s) 63463 Water Pan Hose - AHC-990 26968-006 Water Pan Hose - AHC-993 MS01-263 Clamp - Hose FP01-265 Elbow - 3/4” 90 Degree SS Street FP02-089 Nipple - 3/4”...
  • Page 62 Model AHC-990/993 Item No. Part No. Description Quantity A 1 140170 Kit - Water Pan Heater - 120V 140171 Kit - Water Pan Heater - 208V 140172 Kit - Water Pan Heater - 240V NS02-007 Nut Hex Keps - #8-32 C 140308 120V AHC-99X Water Pan Assy 140309...
  • Page 63 Standoff - .25 dia. x .63 lg. #8-32 SS 28071 Overflow Tube 79107 Chain Assy - Retaining 91478 Assy. - Air Duct - W/O Scoop AHC-993 (5/25/2011 & after) 91492 Assy.-13 Tray Air Duct-Lower-W/O Scoop-990 (5/25/2011 & after) 88933 Cover - Slotted Rear Water Pan (Long)
  • Page 64 Model AHC-990/993 03681 - 5 ft. Adaptor Plate (Replacing HCW-5 with 2 AHC-993’s) 03689 8 ft. Adaptor Plate (Replacing HCW-8 with 3 AHC-993’s) 03698 03700 Plate Cover Stud Assy. 8 ft. Adaptor Plate (NS03-023 & WA01-012 w/Cover included) (Replacing HCW-8 with 2 AHC-993’s)

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