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Hoshizaki DT-400BAH-OS, Service Manual

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Hoshizaki DT-400BAH-OS Service Manual Download Page 13

13

3. Controls and Adjustments 

a) Portion Control

When the change switch (dispense mode switch) is placed in the "PORTION" position, a 
variable resistor (located on the control board) controls the ice dispense time.

The figures on the label indicate dispensing time (sec.). When shipped, the portion 
control is set at the minimum dispensing time (0.6 sec.). 
DT-400BAH-OS . . . . . . . . . . . . Approximately 0.7 oz.

Amount of ice dispensed per second.
DT-400BAH-OS . . . . . . . . . . . . Approximately 1. oz.

4. Control Board Check Procedure

Before replacing a control board that does not show a visible defect and that you suspect 
is bad, always conduct the following check procedure. This procedure will help you verify 
your diagnosis.

a) Power Supply

1. Move the control switch to the "ICE" position. The "POWER" LED should come on. 

If the "POWER" LED is off, check that the power supply is on, the power switch is in 
the "ON" position, the safety switch is not engaged, and the control switch is in the 
"ICE" position. Check the transformer 10.5V secondary circuit and fuse. If the 10.5V 
secondary circuit (K4 pins 1 and ) has proper voltage and the "POWER" LED is off, 
the control board is bad and should be replaced. 
If the secondary circuit does not have proper voltage, see "IV.C.1.[1] The icemaker will 
not start (Fill Cycle)" for further details.

b) Ice Making Components

1. Confirm the reservoir is full of water. If no water is in the reservoir, make sure that the 

control switch is not in the "DRAIN" position and that the unit is not in the 1 hour drain 
cycle. Also check the water supply line, water shutoff valve, and water filters. In the fill 
cycle, the "POWER" LED will be the only LED lit on the control board. If no water is 
filling the reservoir, check for 4V at connector K terminal 7 to neutral and connector 
K3 (DBU) to neutral. If there is 4V at connector K terminal 7 to neutral and no voltage 
at K3 (DBU) to neutral, the control board is bad and should be replaced. See "IV.C.1.[1] 
The icemaker will not start (Fill Cycle)" for further details.

. When the reservoir is full, the "GM" LED comes on and the gear motor starts. If the 

"GM" LED does not come on or the gear motor does not start, check that the following 
safety circuits are closed: a) high pressure switch (connector K4 terminals 5 and 6), 
b) low water safety/bin control/ice making switch circuit (connector K4 terminals 
3 and 4). Next, check for 115/10V at connector K1 "COM" and K1 "NO" on the control 
board to neutral. If the "GM" LED is on and there is voltage at connector K1 "COM" to 
neutral and no voltage at K1 "NO" to neutral, the control board is bad and should be 
replaced. See wiring diagram "III.C.. Ice Purge Cycle" for further details.

Summary of Contents for DT-400BAH-OS

Page 1: ...Hoshizaki A Superior Degree of Reliability www hoshizaki com Model DT 400BAH OS Cubelet Icemaker Dispenser Hoshizaki America Inc Number Issued 5 8 2008 SERVICE MANUAL 73155...

Page 2: ...Should the reader have any questions or concerns which have not been satisfactorily addressed please call write or send an e mail message to the Hoshizaki Technical Support Department for assistance...

Page 3: ...60 seconds 8 3 Freeze Cycle 8 4 Drain Cycle 8 5 Shutdown 8 D Control Board 10 1 Control Board Layout 11 2 Features 12 3 Controls and Adjustments 13 4 Control Board Check Procedure 13 E Float Switch 14...

Page 4: ...46 4 Removal and Replacement of Evaporator 47 5 Removal and Replacement of Mechanical Seal and Lower Housing 48 6 Removal and Replacement of Gear Motor 49 G Removal and Replacement of Fan Motor 50 H R...

Page 5: ...8 lbs 140 kg CONNECTIONS ELECTRIC Cord Connection WATER SUPPLY Inlet 1 2 FPT DRAIN Outlet 3 4 FPT x 2 ICE MAKING SYSTEM Auger type HARVESTING SYSTEM Direct Driven Auger 1 4 HP Gear Motor ICE MAKING WA...

Page 6: ...ondenser Spout Cover Evaporator Compressor Dispense Controls Dispensing Motor Bin Control Agitating Motor Agitator Ice Dispensing Auger Dispensing Water Valve Gear Motor Drain Water Valve Float Switch...

Page 7: ...ead Cap Screw Gear Motor Spline Coupling Housing Lower Bearing O Ring Mechanical Seal Evaporator Auger Extruding Head Upper Bearing Auger Cap Allen Head Cap Screw Hex Head Bolt Drain Pan Auger Sleeve...

Page 8: ...is time frame depends on the inlet water and ambient temperature conditions UF S and LF S operate WV as needed to continue the ice making process This continues until BC shuts the icemaker down or pow...

Page 9: ...WV on LF S closed UF S closed WV off WCR on WV off GM on GMPR on Comp on FMS on WCR continues GM continues GMPR continues Power switch ON Control switch in ICE 1 Fill Cycle 3 Freeze Cycle Refill 90 se...

Page 10: ...susceptible to failure due to static discharge It is especially important to touch the metal part of the unit before handling or replacing the board 3 Do not touch the electronic devices on the contr...

Page 11: ...tch GM LED X1 Relay Gear Motor WTR LED X5 Relay Dispensing Water Valve ICE LED X4 Relay Shutter Solenoid Dispensing Auger Motor 24V In 24V Supply Out 115V In Gear Motor Protect Relay Circuit Portion C...

Page 12: ...le Relay LED Energized Components Time LEDs are On Frequency LEDs are On Fill POWER only WV N A As Needed Ice Purge X1 GM GM 60 seconds N A Freeze X1 X2 GM COMP GM Comp FMS N A N A Drain Valve X6 FLUS...

Page 13: ...1 1 The icemaker will not start Fill Cycle for further details b Ice Making Components 1 Confirm the reservoir is full of water If no water is in the reservoir make sure that the control switch is not...

Page 14: ...is case the float switch should be cleaned and checked First remove the switch from the water tank Soak the switch assembly in ice machine cleaner While not necessary the floats can be removed from th...

Page 15: ...Inlet Water Valve Dispensing Water Valve Drain Valve Float Switch Water Level To Drain Evaporator Drain Pan Transport Hose Expansion Valve Gear Motor Overflow Reservoir Water Supply Drier Condenser C...

Page 16: ...GND BK BLACK BR BROWN BU BLUE DBU DARK BLUE GY GRAY LBU LIGHT BLUE O ORANGE P PINK R RED V VIOLET W WHITE Y YELLOW W BK WHITE BLACK W BR WHITE BROWN W BU WHITE BLUE W O WHITE ORANGE W R WHITE RED WIR...

Page 17: ...BROWN BU BLUE DBU DARK BLUE GY GRAY LBU LIGHT BLUE O ORANGE P PINK R RED V VIOLET W WHITE Y YELLOW W BK WHITE BLACK W BR WHITE BROWN W BU WHITE BLUE W O WHITE ORANGE W R WHITE RED WIRE COLOR CODE Hig...

Page 18: ...itch in the ICE position the inlet water valve energizes and the reservoir fills with water until the upper float switch closes DT 400BAH OS BK BLACK BR BROWN BU BLUE DBU DARK BLUE GY GRAY LBU LIGHT B...

Page 19: ...valve closes gear motor starts gear motor protect relay energizes DT 400BAH OS BK BLACK BR BROWN BU BLUE DBU DARK BLUE GY GRAY LBU LIGHT BLUE O ORANGE P PINK R RED V VIOLET W WHITE Y YELLOW W BK WHIT...

Page 20: ...seconds after gear motor starts DT 400BAH OS BK BLACK BR BROWN BU BLUE DBU DARK BLUE GY GRAY LBU LIGHT BLUE O ORANGE P PINK R RED V VIOLET W WHITE Y YELLOW W BK WHITE BLACK W BR WHITE BROWN W BU WHITE...

Page 21: ...ve opens In the 12 hour drain cycle the drain water valve remains open for 20 minutes When the drain cycle is initiated manually using the control switch the drain valve remains open until the control...

Page 22: ...the compressor and fan motor stop the agitating motor operates for 0 6 seconds and 60 seconds later the gear motor stops DT 400BAH OS BK BLACK BR BROWN BU BLUE DBU DARK BLUE GY GRAY LBU LIGHT BLUE O...

Page 23: ...ond shutdown sequence begins The inlet water valve remains open until the upper float switch closes DT 400BAH OS BK BLACK BR BROWN BU BLUE DBU DARK BLUE GY GRAY LBU LIGHT BLUE O ORANGE P PINK R RED V...

Page 24: ...relay energizes and the icemaker shuts down DT 400BAH OS BK BLACK BR BROWN BU BLUE DBU DARK BLUE GY GRAY LBU LIGHT BLUE O ORANGE P PINK R RED V VIOLET W WHITE Y YELLOW W BK WHITE BLACK W BR WHITE BRO...

Page 25: ...ow time for the high pressure switch to close then move the power switch to the OFF position and then back to the ON position DT 400BAH OS BK BLACK BR BROWN BU BLUE DBU DARK BLUE GY GRAY LBU LIGHT BLU...

Page 26: ...aximum dispense time per dispense switch activation is 60 seconds After 60 seconds the dispense switch must be disengaged and engaged again DT 400BAH OS BK BLACK BR BROWN BU BLUE DBU DARK BLUE GY GRAY...

Page 27: ...nsing time sec See II D 3 a Portion Control When shipped the portion control is set at the minimum dispensing time 0 6 sec DT 400BAH OS Approximately 0 72 oz Amount of ice dispensed per second DT 400B...

Page 28: ...1 969 APPROXIMATE WATER 70 49 186 47 176 44 168 CONSUMPTION PER 24 HR 80 42 161 41 153 39 147 TOTAL 90 37 140 36 135 34 128 gal day l day 100 32 122 31 116 29 110 EVAPORATOR OUTLET TEMP 70 15 10 16 9...

Page 29: ...ontacts and the coil on the inlet water valve Check that the inlet water valve shuts off when the upper float switch closes If not check the float switch water control relay and inlet water valve 4 Ic...

Page 30: ...valve and inlet water valve solenoid or drain valve leaking 7 Drain Cycle FLUSH LED is on 12 hour timer activates the flush cycle and a 150 second shutdown sequence begins 90 seconds after the 12 hour...

Page 31: ...ator and switch e Transformer 1 Coil winding open 1 Replace f Fuses 2 1 Blown 1 Check for short circuit and replace g Control Switch 1 OFF or DRAIN position 1 Move to ICE position 2 Bad contacts 2 Che...

Page 32: ...1 See II D 4 Control Board Check Procedure 2 Fill cycle will not terminate a Water Supply 1 Water supply off or pressure too low 1 Check and get recommended pressure b Float Switch 1 Connector disconn...

Page 33: ...ecifications 1 Refer to nameplate and correct 2 Wiring to compressor 2 Check for loose or open connection repair or replace 3 Defective 3 Replace 4 Compressor locked and internal motor protector tripp...

Page 34: ...educe temperature 3 Fan motor slow rpm 3 See 3 2 a Fan Motor 4 Fan motor capacitor 4 Check and replace 5 Condenser water pressure too low or off water cooled model only 5 Check and get recommended pre...

Page 35: ...lace c Float Switch 1 Bad contacts 1 Check for continuity and replace d Water Control Relay 1 Bad contacts 1 Replace 4 Gear motor overload protector operates frequently or fuse blows frequently a Powe...

Page 36: ...Replace f Auger Mechanism 1 Bad alignment of auger 1 Realign g Control Board 1 Defective 1 See II D 4 Control Board Check Procedure 2 Abnormal noise a Gear Motor or Gear Head 1 Bearing worn out 1 Repl...

Page 37: ...2 Defective 2 See chart 5c below b Change Switch Dispense Mode Switch 1 Wrong setting 1 Move to desired setting 2 Bad contacts 2 Check for continuity and replace 3 Loose connection 3 Tighten c Contro...

Page 38: ...fter all other repair or replacement has been made 4 Do not leave the system open for longer than 15 minutes when replacing or servicing parts A Safety Switch CAUTION This icemaker incorporates a spou...

Page 39: ...3 Always recover the refrigerant and store it in an approved container Do not discharge the refrigerant into the atmosphere 4 Do not use silver alloy or copper alloy containing arsenic 5 Use an electr...

Page 40: ...place it on scales Open the high side valve on the service manifold 7 Allow the system to charge with liquid until the proper charge weight is met 8 If necessary add any remaining charge to the system...

Page 41: ...ndle g Raise the insulation on the transport hose Loosen the clamp and disconnect the transport hose from the evaporator h Remove the refrigeration circuit tray 4 Proceed to the appropriate section be...

Page 42: ...e rubber grommets of the prior compressor to the new compressor 8 Place the compressor in position and secure it using the bolts and washers 9 Place the new drier in position 10 Remove plugs from the...

Page 43: ...0 F 121 C 8 Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the system if using an electronic leak detector and then raise the pressure using nitrogen...

Page 44: ...pper Bearing Evaporator Allen Head Cap Screw with Washer Allen Head Cap Screw Housing and Lower Bearing Gear Motor Barrier Spline Coupling O Ring Mechanical Seal Spring Retainer Auger Allen Head Cap S...

Page 45: ...g requires a bearing press adaptor If one is not available replace the whole extruding head and housing 4 Replace the auger cap and auger sleeve in their correct positions 5 Replace the refrigeration...

Page 46: ...e evaporator 2 After the water has stopped draining remove the refrigeration tray as outlined in V C Removal of Refrigeration Tray 3 Remove the allen head cap screws and lift off the auger sleeve Usin...

Page 47: ...ct surfaces of these two parts are worn cracked or scratched the mechanical seal may cause water leaks and should be replaced Instructions for removing the mechanical seal and lower housing are locate...

Page 48: ...rator to the lower housing 6 Raise the evaporator up to access the lower housing 7 Remove the mechanical seal from the housing If only replacing the mechanical seal proceed to step 9 CAUTION To help p...

Page 49: ...ator up slightly 4 Remove the 2 bolts securing the gear motor drain pan 5 Disconnect the wiring from the gear motor then remove the gear motor and gear motor drain pan 6 Remove the spline coupling fro...

Page 50: ...ide the refrigeration circuit tray back into position 11 Realign the inlet reservoir hose CAUTION 1 When reinstalling the refrigeration tray make sure the drain hoses align properly over the drain tan...

Page 51: ...Fig 3 a Remove the screw and L bracket at the base of the tray b Move the water supply inlet reservoir hose coming into the top of the reservoir to the side c Slide the refrigeration tray forward to t...

Page 52: ...cemaker from the electrical outlet 3 Remove the upper front panel 4 Remove the front cover of the storage bin 5 Remove the thumbscrews first from the vertical plane and then from the horizontal plane...

Page 53: ...Remove the four flat head screws and the gear motor 8 Install the new motor 9 Assemble the removed parts in the reverse order of which they were removed 10 Plug the icemaker back in Move the control...

Page 54: ...y 9 6 fl oz 0 29 l of recommended cleaner Hoshizaki Scale Away or LIME A WAY Economics Laboratory Inc with 1 6 gallons 6 0 l of warm water 2 Cleaning Procedure 1 Close the water supply line shut off v...

Page 55: ...switch to the ICE position Run the icemaker until it stops automatically 17 Move the control switch to the DRAIN position and wait about 15 minutes for the water system to drain Note If you do not sa...

Page 56: ...Plug the icemaker back in Move the power switch to the ON position and replace the panels in their correct positions 18 Move the control switch to the ICE position and run the icemaker about 30 minut...

Page 57: ...water 3 Dispensing Components Cleaning and Sanitizing Procedure 1 Move the control switch to the OFF position and remove the upper front and top panels 2 Move the power switch to the OFF position Unp...

Page 58: ...pensing agitator bin control bracket assembly spout packing ice dispensing spout water dispensing nozzle and spout cover back in position 14 Clean the storage bin liner and rinse thoroughly 15 Plug th...

Page 59: ...phone number of your local distributor visit our website at www hoshizaki com or call Hoshizaki Technical Support at 1 800 233 1940 in the USA 1 Icemaker and Storage Bin Hoshizaki recommends cleaning...

Page 60: ...tch to the OFF position 10 Unplug the icemaker from the electrical outlet 11 Remove the front cover of the storage bin Pour warm water into the storage bin to melt any remaining ice Dry out the storag...

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