Hoshizaki DCM 300BAH(-OS) IV. Service Diagnosis, A. Ice Production Check, B. Diagnostic Procedure

IV. Service Diagnosis

WARNING

•This icemaker should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire.

•Risk of electric shock. Use extreme caution and exercise safe electrical practices.

•Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.

•CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are securely in place after the icemaker is serviced. Make sure that none have fallen into the storage bin.

•Make sure all food zones in the icemaker and storage bin are clean after

the icemaker is serviced. For cleaning procedures, see "VI. Cleaning and Maintenance."

A. Ice Production Check

To check production, prepare a bucket or pan to catch the ice and a set of scales to weigh the ice. After the icemaker has operated for 10 to 20 minutes, catch the ice production for 10 minutes. Weigh the ice to establish the batch weight. Multiply the batch weight by 144 for the total production in 24 hr.

B. Diagnostic Procedure

This diagnostic procedure is a sequence check that allows you to diagnose the electrical system and components. Before proceeding, check for correct installation, adequate water pressure (10 to 113 PSIG), and proper voltage per unit nameplate. Check that the 24VAC 1A fuse and the 10.5VAC 0.5A fuse are good. When checking high-voltage (115VAC), always choose a neutral (W wire) to establish a good neutral connection. When checking low-voltage (24VAC and 10.5VAC), always choose a neutral (LBU wire) from CT to establish a good neutral connection. WARNING! LBU wires are used

in both high-voltage and low-voltage applications. When checking low-voltage (24VAC and 10.5VAC) confirm that the neutral (LBU wire) being used is the LBU wire from CT, not the 115VAC power LBU wire used for Comp/FM operation or the 24VAC LBU wire on the control switch to GMPR (DV operation).

When checking DC-voltage (5VDC), use CB K3 connector pin #1 for DC ground (GND). CB "POWER" LED remains on unless power supply is interrupted. IMPORTANT!

Icemaker will not start unless the front panel safety switch is engaged.

1)Turn on the power supply. Remove the front panel. Move the power switch to the "ON" position, then move the control switch to the "DRAIN" position. Engage the safety switch.

2)Allow the water system to drain for 5 minutes. If water does not drain from the icemaker, see step 12 Drain Cycle below.

3)Disengage the safety switch, then move the control switch to the "OFF" position.

4)Move the power switch to the "OFF" position.

5)Remove the control box cover.

6)Engage the safety switch.

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