AM SERVICE TRAINING Featuring the IM-500SAA 80047 9/10/13
All IM models have similar sequence of operation. This manual is designed as a generic IM Training manual. The Hoshizaki IM series ice machine uses a horizontal evaporator design which forms a square cube shape with a small dimple. 20mm A standard 120-volt power cord (field supplied) provides the electrical connection. The unit is designed to operate on a separate 20-amp circuit. The water supply connection is 1/2” FPT fitting and is located at the top right side of the unit.
The ABS water plate sprays water up into the evaporator cells to form the square IM cube. The moveable water pan assembly includes the water plate, reservoir pan, and pump motor assembly. Tension springs connect two cam arms to the water plate assembly. An actuator motor rotates the cam arms to raise and lower the water pan during the ice making cycle.
The horizontal evaporator and water distribution system are unique to the Hoshizaki IM series. The IM-500 makes ice on a horizontal evaporator and uses R-404a refrigerant. The IM-500SSA sequence of operation will be explained in the following pages.
Thermistor The IM-500SAA unit uses a combination thermistor and control board to control the sequence of operation. SOFT START: When the toggle switch is placed in the “ON” position and the bin control calls for ice, the unit will begin in the soft start the display will say “on” and the hot gas valve will open after 30 seconds the initial harvest cycle begins,(if the reset switch is pressed during the 30 sec. standby time the unit will skip soft start and immediately starts operation).
As soon as the pan starts to open the defrost backup timer starts, if the thermistor mounted on the evaporator does not reach the defrost completion temperature before the timer times out at 30 min. the display will show “E2” and the unit stops. (if the HGV does not open this could also give you an “E2” error) The harvest cycle is controlled by thermistor when the defrost completion temperature of 18.5º C or more is reached the HGV closes, the fan motor starts, and the water pan starts closing.
WATER PAN CLOSES/FREEZE: When the water pan closes and the hall IC turns on the water valve opens to supply ice making water for a specific time. The supply time varies between startup, reset, and end of bin control cycle between partial flush and full drain. NOTE Full drain flush: After a freeze cycle ends the unit drains all remaining water out of the tank and refills for the next freeze cycle.
The IM-500SAA uses a mechanical bin control located on the right rear side of the ice drop zone. This control will open when ice pushes against the switch, if the switch stays open for more than 10 seconds the machine will start the bin control cycle, starts and the machine will shut down after the next defrost cycle. After the bin control stays closed for more than 80 seconds the bin control cycle will end and the machine will restart.
The control switch is marked “ICEOFF-WASH” and is located on the upper right front of the unit. “OFF” – No power supplied to unit “ICE” – Starts the automatic Ice making process “WASH” – Power is supplied to water pump (this allows for cleaning and/or sanitizing “RESET”- If the reset is pushed after the unit is turned to ICE the soft start is skipped after 3 seconds the water pan starts to open in the initial cycle.
CONTROL BOARD: A solid state board controls the IM operation. The control board is factory adjusted to produce consistent ice in all ambient conditions. “NO SEASONAL ADJUSTMENTS ARE REQUIRED” If it becomes necessary to install a new IM-500SAA control board, part number P01873-01, the model code must be programmed into the board before the unit will operate properly Follow the steps below for programing: 1. Once the board has been installed, apply power to the unit and turn the switch on. 2.
Preventative maintenance: Follow these steps to allow the unit to operate efficiently. 1. Clean the condenser once a year using a brush or vacuum. 2. Check and clean the inlet water valve screen as needed to assure proper water flow. 3. Clean and sanitize the water distribution system annually using the recommended cleaner. (See below for detailed information on cleaning the water system) 4. Wipe down the exterior using a soft cloth and neutral cleaner.
1) Dilute approximately 7.2 fl. oz. (214 ml) of recommended cleaner Hoshizaki “Scale Away” with 0.8 gal. (3.0 lit.) of water. 2) Turn off the power supply. 3) Remove all ice from the storage bin. 4) Remove the front panel. 5) Remove the screw, and then move the water tank drain pipe to the drain position. See Fig. 5. Use the screw to secure the water tank drain pipe in the drain position. 6) Make sure the control switch is in the “ICE” position, and then replace the front panel.
14) Turn on the power supply to start the washing process. 15) Turn off the power supply after 30 minutes. 16) Open the icemaker water supply line shut-off valve. See Fig. 4. 17) Remove the front panel. 18) Move the control switch to the "ICE" position. 19) Replace the front panel. 20) Turn on the power supply for 3 minutes. The water tank drains. 21) Turn off the power supply. 22) Repeat steps 20 and 21 three more times to rinse thoroughly. SANITIZING: 1) Dilute a 5.
5) Remove the front panel and top panel. 6) Move the control switch to the “WASH“ position. 7) Slowly pour the sanitizing solution over the top of the evaporator and into the water tank. Do not splash or spill the solution onto other parts. 8) Replace the front panel and top panel in their correct positions. 9) Turn on the power supply to start the sanitizing process. 10) Turn off the power supply after 15 minutes. 11) Open the icemaker water supply line shut-off valve.
21) Replace the front panel. 22) Clean the storage bin liner using a neutral cleaner. Rinse thoroughly after cleaning. 23) Turn on the power supply to start the automatic ice making process.
Electrical Specifications: The unit is 115 volt/ 60 hz./1ph. The IM-500SAA should be connected to a separate 20 Amp circuit.
IM SERIES REVIEW QUIZ Choose the best answer for each question below. 1. The IM control board is located in the rear or the unit. True False 2. The IM unit uses a thermostatic bin control. True False 3. The bin control switch must OPEN or CLOSE to shut the unit down? 4. The IM series uses R-404A or R-134A refrigerant. 5. The IM-500SAA only uses one thermistor located on the evaporator? True False 6. The freeze cycle is temperature and time terminated. True False 7.
NOTES: Quiz answers: 1.False, 2. False 3. Open, 4. R-404A, 5. True, 6. True, 7. False, 8. False., 9.
