User manual SCOTSMAN NME650

[. . . ] NME650 & FME800 INTRODUCTION To the owner or user: The service manual you are reading is intended to provide you, and the maintenance or service technician, with the information needed to install, start up, clean, maintain, and service this ice system. This is a modular ice system that fits a variety of Scotsman ice storage bins. It features: front service for the freezer, gearmotor, control box, water reservoir, and bin control; an electronic circuit for monitoring ice and water level; a thermostatic expansion valve; and HP62 as the refrigerant. Table of Contents FOR THE INSTALLER . 20 REMOVAL AND REPLACEMENT: Bin Controls . [. . . ] Check the high pressure cut out, if closed go to F; if open check: 1. Check the high side pressure, reset the control, and observe: on water cooled, that water soon begins to flow from the condenser drain; or, on air cooled, that the fan is forcing air through the condenser. If the unit trips out on pressures below 450 psig, replace the control. If the pressures rise above the trip out point, and the unit shuts down: a. Check for adequate water flow on water cooled, if adequate, clean the interior of the condenser. If the pressures are still too high replace the water regulating valve. Check for adequate air flow on air cooled. Clean the condenser and (if used) the filter. If the air flow is poor because of the installation, advise the user that the unit should be moved, or the air around it kept cooler. Check the fan motor for tight bearings and proper rotation. Check that the fan blades are clean, and the fan secure to the fan motor shaft. F. The machine must have enough water in the reservoir. 1. See the next step. February 1997 Page 20 NME650 & FME800 SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES G. Check: The gear motor, the motor must turn at full speed or the compressor contactor will not pull in. If the motor will not turn fast enough, check the auger and evaporator for scale build up. If no power to the motor: Check: The indicator lights on the circuit board, the bin empty light should be ON, the no water light should be OFF . If the bin empty and no water lights are off, check the transformer. Transformer "load" side should have 12 to 15 volts. If not, check the "line" side. The line side should be at line voltage. If the line side has the correct voltage and the load side does not, replace the transformer. If the transformer is good, and the bin empty light is OFF, check the ice level sensors. Remove sensors by sliding them sideways out of the ice chute. [. . . ] Access Valves ·Anytime the refrigeration system has been Note: There are no valve opened, the dryer should be replaced. ·When brazing the tubing connections to components such as the TXV, the component must be protected by heat sink material. February 1997 Page 31 NME650 & FME800 CIRCUIT BOARD TESTING Electrical Shock Hazard. Electrical shock can cause personal injury. Disconnect electrical power before connecting tester. [. . . ]