KHT-14B High-Temp Dishmachine OPERATION & SERVICE MANUAL
Contents
1. 6 of 16 KHT I4B DISHWASHER The detergent dispenser power cable is already attached It supplies a main power connection detergent connection and rinse connection to operate a Knight warewash dispenser The machine is also equipped with a dispenser bracket that can be mounted on the water supply bracket to hold the dispenser Supplied Electrical Power for Dispenser Legend 1 Black PWR amp HOT for constant supply to chemical dispenser 2 White Common to constant detergent and rinse 3 Orange is detergent power and is active when main pump is on 4 Purple is rinse power and is active during rinse and fill Each power loading must not exceed 5A Please refer to the electrical wiring diagram attached on the machine front panel e Attention The pull out distance of the electrical box should be put into consideration for all the wire connections to prevent wires from loosening e Attention Use 600V sealed electrical wire Lok 1A L HOT 1A HOT Diagram 4 DET 1 DET RINSE 1A RINSE 1FU 5 1FU G G A cable for dispenser power is prepared and has been inserted into a sized at 0 5 flexible conduit with 0 866 size connectors in both ends Connections are as follow 1 Yellow green color wire sixed at 18 AWG marked with G as ground wire for chemical dispenser 2 White color wire sized at 18 AWG marked with HOT L21 as common wire for chemical dispenser 3 Black color wire sized at 182. AWG marked with L L11 as constant supply with 208v AC 1 Amp for chemical dispenser 4 orange color wire sized at 18 AWG marked with DET 33 as detergent signal with 208v AC 1 Amp for chemical dispenser 0900980 Rev REL 04 13 Page 7 of 16 KHT I4B DISHWASHER 5 purple color wire sized at 18 AWG marked with RINSE 21 as rinse signal with 208v AC 1 Amp for chemical dispenser Water connection Warning Water pipe connection must comply with relative local plumbing codes and safety ordnances Water supply Connect the water inlet hose 1 2 thread with water supply valve Requirement of Water Supply Water inlet temp Water flow pressure Relative heating power C F PSI 14kW rinse heating 40 50 100 120 157 25 Caution check water inlet pressure after connection if flowing pressure below 15 PSI a booster pump is needed to increase the water pressure to the required range If flowing pressure is higher than 25 PSI adjust the pressure regulator to the required water pressure as recommended Drainage Connection the drain pipe 1 5 under the wash tank with an appropriate drainage drain capacity should be at least 95 5 L min Injection of drying agent There are two injection points for the rinse additive on the upper left of the booster heater Left one is to inject the rinse additive directly into the booster heater and the centre one is to the rinse arms Use an Allen key to take
3. obligation whatsoever KNIGHT LLC A Unit of IDEX Corporation www knightequip com Knight Headquarters USA Toll Free Knight Canada Knight Europe Knight Australia Knight N Asia Knight S Asia Tel 949 595 4800 Tel 800 854 3764 Tel 905 542 2333 Tel 44 1323 514 855 Tel 61 2 9352 1801 Tel 82 2 3481 6683 Tel 65 91700984 Fax 949 595 4801 Fax 800 752 9518 Fax 905 542 1536 Fax 44 1323 514 828 Fax 61 2 9352 1899 Fax 82 2 3482 5742 Fax 65 64896723 0900980 Rev REL 04 13 Page 16 of 16
4. out the hole plug and connect the rinse additive injection valve then tightened Injection fitting supplied with dispenser 1 8 NPT A P LEY Al je lt 0900980 Rev REL 04 13 Page 8 of 16 KHT I4B DISHWASHER Diagram 5 OPERATION Control panel On OFF I 0 Press switch to I power light h on indicates power connected amp control panel is ready to go for next step When wash tank water level is lower than required or empty fill starts and light is on When water level reaches setting fill light goes off amp machine is in standby mode Wash Indicating light It goes on when machine is in wash cycle Power light KNIGHT o Indicating machine s on off switch has been switched to position i WASH ON OFF Door Light E It goes on when doors are open ke Light will go off when doors uo closed Filllight 64 It goes on when wash tank is filling Ea par 16 C C C C 3 1 Cycle Time Selection WASH Press the left button marked Wash I or II to select 60 or 90 seconds wash rinse time during standby mode Note for cold water connections 90 second cycle is recommended Temp Light Left indication shows wash temp ZN Right indication shows rinse temp green lights on indicate present working temp 0900980 Rev REL 04 13 Page 9 of 16 KHT I4B DISHWASHER Recommended operating temperature Main wa
5. KHT I4B DISHWASHER KNIGHT FLUID amp METERING KHT 14B High Temp Dishmachine OPERATION amp SERVICE MANUAL 0900980 Rev REL 04 13 Page 1 of 16 KHT I4B DISHWASHER CONTENT OVERVIEW 3 INSTALLATION 4 LOCATION 4 CONVERSION TO CORNER TYPE HH 5 ELECTRICAL CONNECTION Ra eec parve 6 WATER CONNECTION eret as 8 OPERATION sicci as EPA 9 CONTROL PANEL bts emer perve exe PV ESI 9 PREPARATION 10 DISH WASHING ipisssksxstssencemiivus sevi viae epu a eo 10 CLEANING ee wits 10 MAINTAINANCE 11 TROUBLE SHOOTING as va er ies 11 TROUBLESHOOTING er iternm 11 APPENDIX 1 WIRING DIAGRAMS 2 INSTALLATION GUIDE 3 DISPENSER BRACKET INSTALLATION GUIDE 0900980 Rev REL 04 13 Page 2 of 16 KHT I4B DISHWASHER KNIGHT HIGH TEMP DISHMACHINE Model KHT 14B Installation Operation amp Maintenance Please keep this manual for reference OVERVIEW The Knight Dishmachine is a single rack automatic dishwashing machine three doors lift for loading or unloading the rack When the wash tank is filled up to the required water level as the door is closed the machine will automatically run wash and rinse cycles If the tank water level is low water will be automatically filled into the tank until the normal water level is reached Each time the door is closed The KHT 14B starts to run another complete
6. ase read carefully the electrical wiring diagram as shown on the machine case Properly connect power cables with the designated terminals Power cable for machine is prepared and has been inserted into a sized at 1 flexible conduit with 1 36 size connectors in both ends Connections are as following 1 Yellow green color wire sized at 10 AWG marked with G max loading 30 Amp as ground wire for the machine 2 Red color wire sized at 6 AWG marked with L1 as live wire 1 208v AC max loading 55 Amp for power supply to machine 3 White color wire sized at 6 AWG marked with L2 as live wire 2 208v AC max loading 55 Amp for power supply to machine 4 Blue color wire sized at 6 AWG marked with L3 as live wire 3 208v AC max loading 55 Amp for power supply to machine Connect above wires to the isolated not provided with this machine mounted on the wall Check motor direction Running direction of the motor must match the arrow sign marked on the pump case In case the motor movement is wrong power off first then randomly exchange the connections of any two main cables start the machine again and check the motor direction is correct Warning After first installation it is must to check pump direction Damage may occur from the pump running backwards for an extended period of time Detergent dispenser connection This is 220 60 1 and is live when main power turned on 0900980 Rev REL 04 13 Page
7. ater pressure Solenoid valve defected Air vent inside the wash tank clogged REPAIRING If the machine needs repairing or adjustment please contact the supplier or local authorized dealer 0900980 Rev REL 04 13 Page 12 of 16 KHT I4B DISHWASHER 11 1121157 123 5FU 0280 Wh Or Pu Chemical Dispenser Connection RTI F WASH 08 RINSE WU 2FU Dispenser rinse sional SFU i AFU Dispenser Hotsupoly Dispenser oonsantsuppy 465 Wash 1T timer S timer 0 543 105 Rinse cyck timer SB1 On Off switch Control board 582 TEL Tank high level Air Pressure switch TLL Tank low level Air Pressure switch Electrical Control Wiring Page 13 of 16 0900980 Rev REL 04 13 KHT I4B DISHWASHER 6 AWG 6 AWG 6 AWG 10 AWG 2 Q gS PSs o gt 59 YI Gr 7Kw 3 Phase Electrical Wiring A UI UZUUZOU NUV NEL U 12 i Bea J1 Wash tank J2 Door close switch relay SJ4 76sec WASH II 3 10 RINSE 1KM Booster heater contactor 2KM Tank heater contactor 3KM Wash pump contactor Circuit Layout DISCLAIMER Page 15 of 16 0900980 Rev REL 04 13 KHT 14B DISHWASHER Knight LLC does not accept responsibility for the mishandling
8. cycle The working height to load the KHT 14B and attach a table is 34 inches or 860 mm The machine has a 2x7 KW rinse water booster and a 5 KW wash tank maintenance heater Incoming water is pressure reducing valve controlled with inline gauge and solenoid operations of the KHT 14B are controlled from the front display panel 0900980 Rev REL 04 13 Page 3 of 16 KHT I4B DISHWASHER INSTALLATION Before installation please read the specification tag placed on the right hand side of the machine and make sure to verify the electrical power supply Immediately after unpacking the dishmachine please examine the machine for any damage caused during transportation Please inform the supplier immediately of any damages Select the right place for installation It is important to put the dishwasher at the right place for installation Please consider the connection of the power supply water supply drainage S S working tables and detergent dispenser to be provided as long as the required space for daily maintenance and ceiling height for opening machine door See diagram 1 for dimension specification Cmm inches 2 E REMARK THIS MACHINE CAN BE CONVERTED FROM STRAIGHT TO CORNER TYPE AS SHOWN CONNECTION OF MACHINE AND WORK TABLE 0900980 Rev REL 04 13 Page 4 of 16 KHT 14B DISHWASHER Diagram 1 The KHT 14B must be horizontally placed for all electrical and water co
9. d solenoid valve or water supply Poor wash results Incorrect pump direction Wash spray is too weak due to pump intake is clogged Power off and drain tank water check wash pump intake for any obstruction Wash temp is too low Inadequate pre heating time or check the thermostat and heating elements Improper detergent dosage please contact the detergent supplier Excessive lime build up needs to be de limed Streaks found on ware washed Improper racking Rinse temp is high or too low Poor rinse or no rinse Abnormal water hardness Wash detergent does not suit local water quality Rinse drying agent not suit local water quality Improper dosage of the cleaning chemicals Inadequate rinse pressure tX ON UE Clogged water inlet strainer causes slow water flow Close the water supply remove the strainer between inlet hose and solenoid valve clean the strainer screen Water supply pressure is too low or water supply is turned off Solenoid valve defected Continue fill or cannot fill water Tiny obstruction entered the fill solenoid valve resulting in abnormal functioning Caution detail checking right after installation is very important small chips may go inside into the piping and being stuck inside valve Power off open the solenoid valve and clean all the interior parts then replace Water supply too low or shut off Pressure regulator is not activating due to low incoming w
10. misuse or non performance of the described items when used for purposes other than those specified in the instructions For hazardous materials information consult label MSDS or Knight LLC Knight products are not for use in potentially explosive environments Any use of our equipment in such an environment is at the risk of the user Knight does not accept any liability in such circumstances WARRANTY stainless steel components have a three year limited warranty from date of purchase against manufacturers defects Warranty replacement for component parts purchased by Knight are limited to warranty by the manufacturer Warranty applies only to the replacement or repair of such parts when returned to factory with a Knight Return Authorization KRA number freight prepaid and found to be defective upon factory authorized inspection Bearings and pump seals or rubber and synthetic rubber parts such as 0 diaphragms squeeze tubing and gaskets are considered expendable and are not covered under warranty Warranty does not cover liability resulting from performance of this equipment nor the labor to replace this equipment Product abuse or misuse voids warranty FOOTNOTE The information and specifications included in this publication were in effect at the time of approval for printing Knight LLC reserves the right however to discontinue or change specifications or design at any time without notice and without incurring any
11. nearby to alert anyone NOT to power on Wash and rinse arms Both upper and lower wash and rinse arms could be rotated freely for a few seconds by gently swinging Turn off the machine before testing and remove obstruction if present If the straining equipment is not in place then the wash arms and jets may be clogged If necessary remove the wash and rinse arms for cleaning To remove the wash and rinse arms just unlock the end caps between the bearings of both arms Attention the O ring seat of the lower wash arm should not be removed When unloading the upper arms hold the arm tightly during unlocking the end caps to avoid dropping Upper and lower arms can be exchanged as they are the same TROUBLE SHOOTING This chapter only provides some general methods for problem solving If problem persists please contact the supplier Common problems Possible reasons and easy solutions Machine cannot be 1 Check to see if door light is off started 2 Check the 1FU fuse in the control circuit 3 Check door magnet switch Will not start or stop 1 Check pressure switch hose connection for water and drain filling and let dry Rinse remains at low 1 Thermostat incorrectly set or damaged Booster heater is 0900980 Rev REL 04 13 Page 11 of 16 KHT I4B DISHWASHER temp defective Water fill pressure or flow volume is too low cause low water level in booster heater Check water inlet strainer an
12. nnections To reach the desired height level and maintain balance turn the adjustable legs accordingly S S working tables should be hung on machine shall see diagram 2 and sealed with silicon to avoid leakage Local regulation may require the install of an exhaust hood or ventilator not provided If needed the required exhaust airflow should be at least 2 8m min DISH TABLE A SEALTO PREVENT LEAKAGE Diagram 2 CONVERT FROM STRAIGHT THROUGH TO CORNER OPERATION For corner operation remove the rack guide and baffle Diagram 3 from the front of the rack guide and use screw to re install the baffle in the front STRAIGHT THROUGH CORNER RACK GUIDE RE INSTALL BAFFLE HERE _ _ Diagram 3 0900980 Rev REL 04 13 Page 5 of 16 KHT I4B DISHWASHER Electrical connection Warning This dish machine must be installed in accordance with the local electrical codes or in the absence of local codes installed in accordance with the applicable requirements in NFPA 70 the National Electrical Code CSA C22 1 Part 1 the Canadian Electrical Code and NFPA 96 Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations All connection of electricity and grounding must comply with any applicable ordinance of the national or local electrical requirements Warning Shut off power supply and lock box to alert anyone NOT to turn power on Ple
13. nse cycles are ended wait for a second until cycle light is off Open the door and pull out the washed rack Repeat procedure until all soiled tableware is completed Whenever cycle starts door should not be opened there is a danger of hot water splashing After each cycle wait until cycle light is off The main wash water in the machine should be changed after each meal period for best operation Cleaning the machine We recommend cleaning thoroughly all interior parts of the machine after each use every meal or at least once a day Cleaning procedures 1 Shut off power 0900980 Rev REL 04 13 Page 10 of 16 KHT I4B DISHWASHER 2 Open the door 3 Liftup overflow pipe to drain tank water 4 Prerinse tables to remove any soil before removing scrap trays in dish machine 5 Remove scrape trays basket and pump intake screen dump the residues but do not smash baskets Poorly shaped baskets will reduce water straining ct and could create pump blockage 6 Flush to clean the interior of the machine thoroughly wash inside the machine 7 Putscreen straining equipment back in place 8 Check if wash arms and rinse arms are rotating freely 9 Check every upper and lower spray jets for clogging if there is any use a narrow pin to clear obstruction or remove the spray arms to clean 10 At end of day leave doors open to let air machine air dry MAINTENANCE Warning Shut off power supply display caution sign
14. sh temp 65 75 C 150 F 158 F Final rinse temp 82 C 95 C 180 F 203 F Preparation for Operation Properly place the scrap trays and basket into the machine and plug in the overflow drain pipe Close the door and turn on power water auto fill starts Machine will start first wash once full to charge machine with detergent Once water is full open door and check water level Insure both detergent and rinse additive activated during cycle chemical supplier will correctly set the correct amounts Wait until wash rinse temperature reaches proper range before starting to wash Close the door then wash and rinse programs will automatically start Washing up procedures Scrap off food residues from dishes and pre rinse Select wash cycle of 60 or 90 seconds according to soil load Property load tableware into racks by the manner that all the surfaces of every piece of tableware should have adequate exposure for water flushing Dishes are to be vertically inserted and bowls should be inversely put into flat racks Cutlery should be loaded into san open rack and glasses must into compartment rack When a rack is fully loaded open the door put in rack and close the door The wash and rinse will proceed automatically Wash cycle starts as the door is closed and rinse cycle will follow when after 4 seconds delay right after the wash has finished When wash amp ri
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