Instruction/ maintenance manual of the product DCM-270BAH-OS Hoshizaki
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SER VICE MANUAL ITEM #: 73110 CUBELET ICE DISPENSER R eliability is a beautiful thing TM ISSUED: F ebruary 10, 2004 REVISED: May 26, 2005 DCM-270BAH-OS.
2 IMPOR T ANT Only qualified service technicians should attempt to service or maintain this ice dispenser. No service or maintenance should be undertaken until the technician has thoroughly read this service manual. HOSHIZAKI provides this manual primarily to assist qualified service technicians in the service and maintenance of the dispenser.
3 Please review this manual. It should be read carefully before the ice dispenser is serviced or maintenance operations performed. Only qualified service technicians should service and maintain the dispenser. This manual should be made available to the technician prior to service or maintenance.
4 I. Specifications 1. DCM-270B AH-OS (air -cooled) We reserve the right to make changes in specifications and design without prior notice. AC SU PP L Y VO L T AGE 1 1 5 /6 0 /1 A M P E RA GE 8.
5 II. General Information 1. Construction The Hoshizaki Cubelet Ice Dispenser, model DCM-270BAH-OS includes water supply, freezer, condensing, storage, dispensing and control assemblies. Note: *Adjustable Legs Minimum height - 4" Maximum height - 5.
6 Fig. 2 2.Operation - How it works Water flows from the potable water source through the water supply line shut-off valve, enters at the water inlet fitting and into the water reservoir. The water reservoir functions to maintain a constant water level inside the freezer assembly.
7 III. T echnical Information 1. W ater Cir cuit and Refrig erant Cir cuit.
8 2. P erf ormance Data [a] DCM-270BAH-OS (air-cooled) Note: Pressure data is recorded first 5 minutes in freezing cycle. The data without *marks should be used for reference. We reserve the right to make changes in specifications and design without prior notice.
9 3. Wiring Diagram.
10 4. Sequence of Electrical Circuit POWER ON WATER STARTS TO BE SUPPLIED TO RESERVOIR AGITATION TIMER ON - (2 SEC.).
11 RESERVOIR FILLS UP GEAR MOTOR TURNS ON.
12 COMPRESSOR STARTS 60 SEC. AFTER GEAR MOTOR..
13 ICE MAKING CONTINUES. START CAPACITOR TAKEN OUT OF CIRCUIT.
14 BIN CONTROL TRIPS. COMPRESSOR STOPS 90 SECONDS LATER..
15 GEAR MOTOR STOPS 60 SECONDS AFTER COMPRESSOR..
16 DISPENSE ICE (BIN CONTROL STILL TRIPPED).
17 FLUSH SWITCH ACTIVATED..
18 FLUSH TIMER ACTIVATED..
19 AGITATION TIMER ACTIVATES GEAR MOTOR..
20 IV . Service Diagnosis 1. No Ice Production PR O BLEM PO SSIBLE CA USE R EMEDY [ 1] The ic e dispens er will not st art . a) Power S upply Cor d 1. Br ok en or loos e connec t ion. 1 . Ch e ck f or co n t in tin ui t y a nd r eplac e. 2. Lo ose c onnec t ion.
21 PR O BLEM PO SSIBLE CA USE REMED Y [ 5] a) F an M ot or 1. Mot or winding open ed. 1. R eplac e. 2. Bearing wor n out . 2. Repl ac e. 3. Wir ing t o f an mot or. 3. C hec k f or loose c onnect io n or open, and replace. 4. F an bla de bound. 4. C hec k and r eplace.
22 2. Low Ice Production PR O BLEM PO SSIBLE CA USE R EMEDY [ 1] Abnorm al ref rigerat ion circu i t . a) Condenser 1. Di r t y air f ilt er or condens er. 1. Clean. 2. Bad v ent ilat ion. 2. Re m ove any t hing block ing ven ts. b) T herm os t at ic Ex pans ion Val ve 1.
23 3. Faulty Dispenser PR O BLEM PO SSIBLE CA USE REMED Y [ 1] a) 1. I ce block or br idge. 1. Remove all ice f rom st orage bin when not us ing ice dis pens er f or a lo ng t im e. 2 . Inco rrect wi rin g . 2. C orre ct w iri ng . b) A git at or 1. Def orm ed due t o ic e block or br idge.
24 If you experience problems with the ice or water dispense, use the following charts along with the wiring diagram (section III, 3) to guide you through your troubleshooting.
25 4. Other PR O BLEM PO SSIBLE CA USE REMED Y [ 1] a) B in Con t rol Swit ch 1. Cont act s f us ed. 1. Replace. 2. O ut of posit i on. 2. Rein s t all. b) W at er Cont rol Relay 1 . Cont act s f us ed. 1. Repl ac e. c) T im er 1 . Def ect iv e. 1. R eplac e.
26 V . Remov al and Replacement of Components IMPORT ANT Ensure all components, fasteners and thumbscrews are securely in place after the equipment is serviced. IMPORT ANT 1. The Polyol Ester (POE) oils used in R-404A units can absorb moisture quickly.
27 4) Close the low-side valve and high-side valve on the service manifold. 5) Disconnect the vacuum pump, and attach a refrigerant service cylinder to the high-side line. Remember to loosen the connection, and purge the air from the hose. See the nameplate for the required refrigerant charge.
28 3. Removal and Replacement of Compressor IMPOR T ANT Always install a new drier every time the sealed refrigeration system is opened. Do not replace the drier until after all other repair or replacement has been made.
29 12) Braze the process, suction and discharge lines (do not change this order), while purging with nitrogen gas flowing at the pressure 3-4 PSIG. 13) Install the new filter drier. 14) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles. 15) Connect the terminals, and replace the terminal cover in its correct position.
30 5. Remo v al and Replacement of Thermostatic Expansion V alve IMPORT ANT Sometimes moisture in the refrigerant circuit exceeds the drier capacity and freezes up at the expansion valve. Always install a new drier every time the sealed refrigeration system is opened.
31 14) Place the new expansion valve cover in position. 15) Replace the panels in their correct positions. 16) Plug in the dispenser and turn on the power supply. 6. Removal and Replacement of Pressure Switch IMPOR T ANT Always install a new drier every time the sealed refrigeration system is opened.
32 7. Remo v al and Replacement of Control W ater V alve 1) Unplug the icemaker. 2) Remove the panels. 3) Close the water supply line shut-off valve. 4) Disconnect the terminal from the control water valve. 5) Loosen the fitting nut on the control water valve inlets, and remove the control water valve.
33 8. Remo v al and Replacement of Flush W ater V alve 1) Turn off the power supply. 2) Remove the panels. 3) Close the water supply line shut-off valve. 4) Remove the clamp and disconnect the hose from the flush water valve that attaches to the evaporator.
34 9. Removal and Replacement of Float Switch W ARNING 1. Fragile, handle very carefully. 2. If the float switch works poorly because of scale or other foreign matter, install a filter or softener in the water supply line. 1) Unplug the dispenser and turn off the power supply.
35 10. Removal and Replacement of Bin Control Switch Assembly 1) Turn off the power supply and unplug the dispenser. 2) Remove the top panel. 3) Remove the bin control switch from the storage bin cover. (Twist, then pull up.) 4) Cut the wire leads and remove switch.
36 11. Removal and Replacement of Storage Bin Assembly 1) Move the ice making switch to the “FLUSH” position. 2) Press the push button to dispense ice and remove all ice from the storage bin. 3) Turn off the power supply and unplug the dispenser. 4) Remove the panels.
37 12. Removal and Replacement of Agitator and Drip Ring 1) Move the ice making switch to the “OFF” position. 2) Press the push button to dispense ice and remove all ice from the storage bin. 3) Turn off the power supply, and unplug the dispenser.
38 13. Removal and Replacement of Evaporator Assembly 1) Move the ice making switch to the “OFF” position. 2) Press the push button to dispense ice and remove all ice from the storage bin. 3) Turn off the power supply, and unplug the dispenser. 4) Flush all water out of the system.
39 13) Disconnect the brazing-connections of the expansion valve and the copper tube - low side from the evaporator, using brazing equipment. 14) Braze the new evaporator with nitrogen gas flowing at a pressure of 3-4 PSIG. 15) Replace the drier. 16) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
40 28) Assemble the removed parts in the reverse order of which they were removed W ARNING Be careful not to scratch the surface of the O-ring, or it may cause water leaks. Handle the mechanical seal with care not to scratch nor to contaminate its contact surface.
41 Fig. 3 VI. Cleaning and Maintenance Instructions IMPORT ANT Ensure all components, fasteners and thumbscrews are securely in place after any maintenance or cleaning is done to the equipment.
42 2. Cleaning Instructions W ARNING 1. HOSHIZAKI recommends cleaning this unit at least twice a year. More frequent cleaning, however, may be required in some existing water conditions. 2. To prevent injury to individuals and damage to the ice dispenser, do not use ammonia type cleaners.
43 Fig. 5 Fig. 4.
44 12) Replace the drip ring and agitator. 13) Move the ice making switch and then the power switch to the “ON” position. Place the storage bin cover in position, and start the automatic icemaking process. Run the ice dispenser until it stops automatically.
45 [b] Sanitizing Procedure 1) Dilute approximately 1.5 fl. oz. of a 5.25% sodium hypochlorite solution (chlorine bleach) with 3 gal. of water. 2) Pour the sanitizing solution carefully into the reservoir through the opening in the center of the storage bin up to an overflow level.
46 2. Maintenance Instructions IMPORT ANT This ice dispenser must be maintained individually, referring to the instruction manual and labels provided with the ice dispenser. 1) Stainless Steel Exterior To prevent corrosion, wipe the exterior occasionally with a clean and soft cloth.
An important point after buying a device Hoshizaki DCM-270BAH-OS (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Hoshizaki DCM-270BAH-OS yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Hoshizaki DCM-270BAH-OS - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Hoshizaki DCM-270BAH-OS you will learn all the available features of the product, as well as information on its operation. The information that you get Hoshizaki DCM-270BAH-OS will certainly help you make a decision on the purchase.
If you already are a holder of Hoshizaki DCM-270BAH-OS, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Hoshizaki DCM-270BAH-OS.
However, one of the most important roles played by the user manual is to help in solving problems with Hoshizaki DCM-270BAH-OS. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Hoshizaki DCM-270BAH-OS along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
