Hobart FT900 SERIES User's Manual
Contents
1. are emptv remove pump intake screens Fig 21 and clean them in a sink Remove the final rinse arms Fig 22 Clean debris from nozzles and arms using a straightened paper clip Fig 23 Never use steel wool to clean warewasher surfaces Use only products formulated to be safe on stainless steel Fig 21 Fig 22 Fig 23 Reinstall wash arm end caps do not overtighten Reinstall wash rinse arms in their proper location Orient arms so upper nozzles point down and lower nozzles point up Arms in the prewash section each have two tubes the slightly longer arm goes below The wash rinse arms with five tubes fit in the upper brackets Arms with four tubes fit in the lower brackets To install the arms rest the rear wash arm manifold on the track open end of the box is at the rear so it can connect to the O ring assembly in the rear Push wash arms to rear Fig 24 Latch wash arms in place Fig 25 Rinse the tank bottom removing any accumulation of food soil Fig 26 Fig 24 Fig 25 Fig 26 Replace the pump intake screens strainer pans and strainer baskets Leave the machine doors open to allow the interior to air out and drv Rehang curtains PHOTOELECTRIC 7 SENSOR OPENINGS Clean machine exterior like any other stainless steel appliance Use damp cloth and mild soapy water If equipped with photoelectric sensor rinse flush the openings where the sensors are located at the load end of the m2. off with clean water The air filter can be washed in the dishwasher and flushed with clean water after NECS washing Replacement air filters are available uuu TL Air Filter contact Hobart service Fig 29 DOs AND DON Ts FOR YOUR NEW HOBART WAREWASHER DO assure proper water hardness of 4 to 6 grains per gallon DO pre scrap dishes thoroughly DO use only detergents recommended by your chemical professional DO at the end of the day thoroughly cleanse the machine rinse and dry leave doors open DO closely follow your chemical professional s prescribed deliming schedule DO use only products formulated to be safe on stainless steel DO NOT over soften water recommended water hardness range is 4 to 6 grains per gallon DO NOT use detergents formulated for residential dishwashers DO NOT allow food soil to accumulate on the tank bottom DO NOT exceed chemical manufacturer s recommended concentrations for detergent sanitizer rinse aid or lime scale remover DO NOT use steel wool to clean ware or warewasher surface DO NOT allow foreign objects to enter the unit especially metallic contaminants NOTE Failure to follow use care and maintenance instructions may void your Hobart warewasher warranty HANG CURTAINS Curtains must be in their proper places Fig 30 A Short Curtain on the unload side of each upper Wash Arm Long Curtains on both sides of everv section divider Two Long Curta
3. CIRCUIT Drain tank s and check for any obstructions at the pump intake Clogged wash arm nozzles Improper water hardness 4 6 grains gallon is the recommended range Incorrect detergent for water type Clogged rinse nozzle s Misaligned rinse arms Rinse arms should be positioned so that they align in hub on chamber wall Inadequate Rinse Dirty line strainer causing reduced water flow Turn off water supply Low supply line pressure Clogged rinse nozzle s Continuous Rinse Rinse Actuator Fig 35 not moving freely Operation on machines DISCONNECT ELECTRICAL POWER SUPPLY IES AND PLACE A equipped with Rinse TAG AT THE DISCONNECT SWITCH TO INDICATE YOU ARE Actuators Fig 35 WORKING ON THE CIRCUIT Check actuator for movement Rinse actuator switch failed Contact Hobart Service Rinse valve failed or jammed open Contact Hobart Service Rinse Actuator POSSIBLE CAUSE Continuous Rinse Photoelectric sensors are blocked Clean sensor openings Fig 27 Operation on Remove side panels from load end of machine adjacent to pre wash machines equipped chamber With machine power on verifv indicators on upper sensor with Photoelectric Fig 36 flash on and off when blocking and unblocking the upper Sensor Rinse Figs 27 sensor Start machine running verifv lower sensor indicator Fig 36 is 36 flashing when conveyor is running Some conveyor configurations only have the upper sensor If ei
4. FT900 SERIES DISHWASHERS R L OPERATION LOAD 5 6 7 8 9 8 FT900 ML 110672 ML 110870 ML 110674 ML 110876 ML 110881 ML 110676 11 FT900W ML 110883 4 9005 ML 110705 L R OPERATION ML 110673 ML 110871 ML 110675 ML 110877 ML 110882 ML 110677 ML 110884 ML 110706 UNLOAD WITHOUT BLOWER DRYER 5 6 8 9 9 split 10 10 split 11 11 split 12 12 split 13 13 split 14 split 15 split 16 split 17 split ML 110680 ML 110805 ML 110682 ML 110807 ML 110684 ML 110809 ML 110813 ML 110817 ML 110686 ML 110821 ML 110825 ML 110829 ML 110833 ML 110837 ML 110841 ML 110845 ML 110849 ML 110853 ML 110681 ML 110806 ML 110683 ML 110808 ML 110685 ML 110810 ML 110814 ML 110818 ML 110687 ML 110822 ML 110826 ML 110830 ML 110834 ML 110838 ML 110842 ML 110846 ML 110850 ML 110854 H L OPERATION L R OPERATION UNLOAD WITH BLOWER DRYER ML 110688 ML 110811 ML 110815 ML 110819 ML 110690 ML 110823 ML 110827 ML 110831 ML 110835 ML 110839 ML 110843 ML 110847 ML 110851 ML 110855 CORPORATION 701 S RIDGE AVENUE TROV OHIO 45374 0001 937 332 3000 www hobartcorp com ML 110689 ML 110812 ML 110816 ML 110820 ML 110691 ML 110824 ML 110828 ML 110832 ML 110836 ML 110840 ML 110844 ML 110848 ML 110852 ML 110856 FORM 33906 Rev C Mar 2000 Operation and Care of FT900 SERIES DISHWASHERS SAVE THESE INSTRUCTIONS OPERATION MACHINE P
5. NS AT SECTION DIVIDERS FT900W L R OPERATION WITH 11 CENTER SECTION PREWASH ARM WASH ARM POWER RINSE ARM RINSE ARMS FOUR SHORT CURTAINS AT 00000 00000 UNEOAD SIDE OF UPPER ARMS AND BETWEEN TWO RINSE ARMS N B OAD UNLOAD R L FIVE PAIRS OF LONG CURTAINS AT SECTION DIVIDERS Fig 30 11 MAINTENANCE WARNING DISCONNECT ELECTRICAL POWER SUPPLY AND PLACE A TAG AT THE DISCONNECT SWITCH INDICATING THAT YOU ARE WORKING ON THE CIRCUIT BEFORE PERFORMING ANY MAINTENANCE PROCEDURE LUBRICATION Alist of acceptable lubricants as well as the lubricants themselves are available from your local Hobart Service Office Line Strainers Line strainers used in water or steam lines should be cleaned one week after machine installation and periodically thereafter Motors All motors have sealed bearings and require no lubrication maintenance Conveyor Gearmotor Check the oil level in the conveyor gearmotor at the unload end of the machine every six months by removing the gear case plug Fig 31 The oil level should be at the bottom of the plug hole The gear case can be drained from the Drain Plug on the front side Fig 32 Use only Mobilgear 630 to replenish or replace l CONVEVOR MOTOR DRAIN PLUG OL a Fig 31 Fig 32 Conveyor Drive Chain DRIVE CHAIN Inspect the drive chain Fig 33 regular
6. REPARATION Check before beginning operation Raise the machine doors and make sure all components are in their proper operating positions Pump Intake Screens must be put Strainer Pans mustbe in placeontopof Strainer Baskets must be in place in holders at each pump intake Fig 1 each tank Fig 2 Strainer Pans Fig 3 A o 7 b 7 Fig 3 End Caps must be correctly installed at Wash Arms must be properly installed The Flush Arm at load end must be ends of all Wash Arms Fig 4 and latched in place Fig 5 properly installed Fig 6 The Final Rinse Arm must be properly installed Fig 7 Curtains must be in their proper places Fig 30 pages 9 11 A Short Curtain on the unload side of each upper Prewash Wash and Power Rinse Arm Long Curtains on both sides of every section divider Two Long Curtains at the Load End HOBART CORPORATION 1998 FILL Assure proper water hardness Recommended range is 4 6 grains per POWER START INITIAL gallon ON OFF FILL All water and steam if equipped supply valves must be opened and the FE electric supplv turned on before the machine will function e eis Close the drains and doors Push the POWER ON OFF switch Fig 9 a DOORS The DOORS CLOSED indicator light blue will be lit when all doors are cLosep closed All tanks will fill for 10 15 minutes NOM
7. When all tanks are filled the water will automaticallv shut off and the green INITIAL FILL light will be lit The proper water level will be maintained throughout operation by the full time auto fill feature Fig 9 a On machines equipped with Electric Blower Dryer option some were equipped with a lighted BLOWER ON OFF switch which controls power to the Blower Dryer Fig 9 b and indicates when the Blower Dryer is running NOTE A RED light Fig 9 0 is provided on Blower Dryers equipped with electric heat to alert the operator to TURN MACHINE OFF DISCONNECT ELECTRIC POWER AND HAVE UNIT SERVICED BY A QUALIFIED TECHNICIAN if the blower over temperature thermostat has been activated On machines equipped with Steam Blower Dryer option some were equipped with a lighted BLOWER ON switch which controls power to the Blower Dryer Fig 9 c and indicates when the Blower Dryer is running When the combination Blower Dryer switch and indicator light is not provided the steam Blower Dryer is on when the pumps are on Push the green START switch at either end of the machine or at the control box to start the conveyor and pumps Push the red STOP switch at either end of the machine or at the control box to stop the conveyor and pumps Tanks will continue to heat if the POWER ON OFF switch remains ON Ifa separate switch is provided for a Blower Dryer push once for On and a second time for OFF If no separate Blower Dryer switch is present the Bl
8. achine Fig 27 pene CLEANING THE TOP DUCT WARNING DISCONNECT ELECTRICAL POWER AND PLACE A TAGAT THE DISCONNECT SWITCH INDICATING THAT THE MACHINE IS BEING WORKED ON BEFORE YOU BEGIN CLEANING Debris and airborne particles will settle on the Top Covers and the surfaces inside the Top Duct The Top Duct should be cleaned about every two weeks as appropriate for your location There are two handles on each Top Cover so they can be lifted or moved to access the inside of the Top Duct for cleaning Fig 28 Before draining and cleaning the machine perform the following cleaning task Use an appropriate ladder and both hands to remove each Top Cover Clean inside the Top Duct with mild detergent warm water solution and brush cloth or sponge Clean the Top Duct from the Eno of the machine towards the Loap END f necessary the Top Duct may be hosed down Rinse with clean water Clean both sides of the Top Covers individually while they are removed After cleaning the Top Duct and the Top Covers replace each Top Cover in its correct location After cleaning the Top Duct drain and clean the dishwasher as discussed on pages 5 and 6 TOP COVER TOP DUCT BOTTOM OF DUCT Fig 28 CLEANING THE BLOWER DRYER AIR FILTER Some steam operated blower dryers are equipped with a removable air filter Fig 29 At least twice each month the air filter should be removed and cleaned in a sink with warm soapy water and hosed
9. commended minimum temperatures are posted on the machine control box Fig 11 FINAL RINSE RINSE WASH PREWASH 180 F 82 C MIN 160 F 71 C MIN 150 F 66 C MIN Fig 11 4 CLEANING The dishwasher MUST be thoroughiv cleaned at the end of each working shift Drain the machine bv lowering the drain levers to a horizontal position Drain levers are located near the floor at the front of each tank Draining the tanks requires approximatelv 5 10 minutes Push POWER switch OFF DISCONNECT ELECTRICAL POWER BEFORE CLEANING Open all front access doors Remove the curtains Clean the curtains Using a good hose with spray nozzle clean the load shelf and unload shelf by spraying debris into the machine Fig 12 Thoroughly cleanse and flush the dishwasher interior Figs 13 amp 14 Fig 12 Fig 13 Fig 14 Remove the wash arms by first releasing the latches Fig 15 Slide upper arms forward swinging front of arm down Fig 16 Remove the end caps Fig 17 Clean wash arms in a sink EW 23 228 TOTO OR 20 Fig 15 Remove the flush arm at the load end of the machine Fig 18 Clean flush arm and nozzles in sink Remove the strainer baskets Fig 19 and strainer pans Fig 20 Empty strainers in trash receptacle or food waste disposer DO NOT STRIKE STRAINER PANS OR STRAINER BASKETS ON SOLID OBJECT TO DISLODGE DEBRIS Scrub strainer pans and strainer baskets in a sink When tanks
10. ins at the Load End FT900 RINSE ARM R L OPERATION WITH POWER RINSE ARM WASH ARM PREWASH ARM 8 CENTER SECTION 72 00000 00000 THREE SHORT CURTAINS AT UNLOAD SIDE OF UPPER ARMS c N B LOAD UNLOAD noe Rx L FOUR PAIRS OF LONG CURTAINS AT SECTION DIVIDERS FT900 L ROPERATION WITH 8 CENTER SECTION PREWASH ARM WASH ARM POWER RINSE ARM RINSE ARM 00000 0000907 THREE SHORT CURTAINS AT UNLOAD SIDE OF UPPER ARMS LOAD UNLOAD romazoo FOUR PAIRS OF LONG CURTAINS AT SECTION DIVIDERS Fig 30 FT900S R LOPERATION WITH 4 CENTER SECTION RINSE ARM WASH ARM PREWASH ARM 00000 TWO SHORT CURTAINS AT UNLOAD SIDE OF UPPER ARMS c N B LOAD UNLOAD To R x L THREE PAIRS OF LONG CURTAINS AT SECTION DIVIDERS FT900S OPERATION WITH 4 CENTER SECTION PREWASH ARM WASH ARM RINSE ARM 00000 TWO SHORT CURTAINS AT UNLOAD SIDE OF UPPER ARMS C LOAD UNLOAD R X L THREE PAIRS OF LONG CURTAINS AT SECTION DIVIDERS Fig 30 10 FT900W R L OPERATION WITH 11 CENTER SECTION FOUR SHORT RINSE ARMS POWER RINSE ARM WASH ARM PREWASH ARM CURTAINS AT UNLOAD SIDE OF UPPER ARMS AND BETWEEN TWO RINSE ARMS UNLOAD LOAD FIVE PAIRS OF LONG CURTAI
11. lv during operation to prevent them from becoming clogged which would adversely affect dishwasher operation STOP the machine and open the side access doors Strainer Baskets are immediately inside at the front of the tanks Loading Pre scrap dishes thoroughly to remove large food particles and debris Never use steel wool on ware to be loaded into the dishwashing machine All plates saucers trays etc should be loaded on the conveyor in an inclined position Bowls should be loaded upside down Cups glasses and silverware should be washed in racks although cups and glasses may be loaded directly on the conveyor DO NOT attempt to wash large items pots pans trays etc without first checking to make sure they will fit through the machine opening Such items must not be washed in this dishwasher unless they will easily pass through it Do not allow foreign objects to enter the unit especially metallic contaminants Unloading Remove dishes from the conveyor and stack similar items together If an item is left on the conveyor it will strike the conveyor trip assembly Fig 10 and stop the conveyor Pumps run for 1 minute then shut off First unload all other ware on the unload conveyor Remove dish in trip arm last Machine automatically restarts Recommended Minimum Temperatures Thermometers monitor water temperatures and should be checked occasionally to assure that proper temperatures are being maintained Re
12. ly and lubricate as required with Grafo Concentrate A supplied GREASE FITTING Conveyor Sprocket Bearings Located at the loading and unloading ends these bearings should be lubricated every four months Grease fittings Fig 33 one at each of the four PL 41058 1 bearings a grease gun and 4 ounces of Alvania 2 grease are provided for this purpose 12 Convevor Speed Adjustment The convevor speed can be adjusted bv vour local Hobart service technician For Model FT900 and FT900W maximum speed is 12 feet per minute FPM factory presetis 8 9 FPM For Model FT900S maximum speed is 6 3 FPM Contact vour local Hobart service office if vour convevor speed needs adjustment TROUBLESHOOTING Manual Reset Button on Pump Motors and Convevor Motor In case anv of the pump or convevor motors becomes overheated the thermal overload will cause the motor to not operate A grav manual reset button is provided on the junction box for each motor Torestart after the motor is allowed to cool press the grav manual reset button on the motor junction box Fig 34 Fig 34 NOTE If symptom s persist after possible causes have been checked contact Hobart Service POSSIBLE CAUSE Machine Won t Operate 1 Blown fuse or tripped circuit breaker at power supply After Start Button Is Inspection door s not closed Doors Closed light is off Pressed Conveyor may be jammed Manual overload protecto
13. ower Dryer should be ON when the pumps are on Electric Blower Dryer Electric Blower Dryer Steam Blower Dryer Steam Blower Dryer with ON OFF Switch without ON OFF Switch with ON OFF Switch powered by the machine and Red Indicator Light with Red Indicator Light ON OFF switch BLOWER A WARNING ON OFF If red indicator lights BLOWER ON w vi ot e Wa Disconnect from power supply WARNING If red indicator lights Disconnect from power 9 ee Ivo Have unit serviced by qualified technician Have unit serviced by qualified technician Fig 9 b Fig 9 c DISHWASHING To start the conveyor pumps and blower dryer if not switched separately press the green START switch at either end of the machine or at the control box The conveyor will operate only when all machine doors are closed and the tanks are filled to the proper level When equipped with Blower Dryer the Blower Dryer will operate with the conveyor and pumps Press the red STOP switch at either end of the machine or at the control box to stop the conveyor and pumps The Auto Timer will automatically stop the machine if no ware is washed for a preset length of time The Auto Timer shut off setting can be changed by your Hobart service technician range is 2 8 minutes 3 Emptv Strainer Baskets During Operation as Necessarv The Strainer Baskets must be emptied periodical
14. r may have tripped on pump motors or conveyor motor Dishes Not Clean Insufficient wash water due to drain obstruction preventing proper drain closing Missing end plug from wash arm Wash arm nozzle obstruction Water leaking past manifold O ring Loss of water pressure due to pump obstructions DISCONNECT ELECTRICAL POWER SUPPLY IES AND PLACE A TAG AT THE DISCONNECT SWITCH TO INDICATE YOU ARE WORKING ON THE CIRCUIT Drain tank s and check for any obstructions at the pump intake Incorrect water temperature Check circuit breaker to electric heat supply or main steam valve Make certain valve is completely open Incorrect detergent dispensing Contact your detergent representative 13 POSSIBLE CAUSE Leaking Valve Except Foreign material preventing proper valve operation A critical period is Solenoid Tvpe Supplied soon after installation when pipe compound or metal shavings mav bv Others lodge at the valve seat Shut off supplv line Unscrew and lift bonnet from valve bodv Clean valve and reassemble If problem is with a solenoid valve it is recommended that you contact your local Hobart service office Spotting of Silverware Improperly loaded dishes Glasses and Dishes Incorrect final rinse water temperature minimum 180 Loss of water pressure due to pump obstruction DISCONNECT ELECTRICAL POWER SUPPLY IES AND PLACE A TAG AT THE DISCONNECT SWITCH TO INDICATE YOU ARE WORKING ON THE
15. ther indicator does not flash contact Hobart Service to replace sensors Rinse valve failed or jammed open Contact Hobart Service No Wash Tank Heat The machine is equipped with low water safety devices which shut off heat if water level drops Check for proper water level Circuit breaker to heat system tripped Check heat float for debris and free movement Steam supply valve not open completely Overtemp protector tripped Contact Hobart Service No Fill or Slow Fill Dirty line strainer Fig 37 causing reduced water flow Turn off water supply remove strainer cap withdraw and clean screens Make sure doors are closed Check both upper and lower fill floats for debris and free movement Problem with solenoid valve Contact Hobart Service LOWER SENSOR IS NOT ALWAYS LEFT GREEN LIGHT INDICATES POWER IS ON RIGHT AMBER LIGHT MAY BE BLOCKED BY CONVEYOR FLIGHT LINK AND IS ON WHEN OPENING IS CLEAR TR LINE STRAINER PL 41435 1 Fig 36 Fig 37 SERVICE Contact your local Hobart authorized service office for any repairs or adjustments needed on this equipment Long term Maintenance contracts are available on this and other Hobart products 15 PRINTED IN U S A 16 G1GHO914U JHNLVHIANIAL JHNLVHIANIL JHNLVHIANIL JYNLVYAdWAL INIL L4IHS Ava SLNJWNOO 3SNIH IVNIJ JISNIY H3MOd ANVL HSVM HSVM3Hd FORM 33906 Rev C Mar 2000
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