User manual SCOTSMAN NME1250

[. . . ] NME1250 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. The NME1250 features: front service for the evaporator, gearmotor, control box, water reservoir and bin control; electronic circuitry for monitoring ice and water level; a thermostatic expansion valve; and HP62 as the refrigerant. TABLE OF CONTENTS FOR THE INSTALLER . 2 FOR THE INSTALLER: Environmental Limitations . 17 SERVICE DIAGNOSIS: Condition - No Ice Being Produced . [. . . ] Replace the drier, evacuate, and weigh in the nameplate charge. E. 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 will not run if there is not enough water in the reservoir. 1. See the next step. June 1994 Page 18 NME1250 SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES G. Check: The gear motor, if it will not run, the compressor will not run. If no power to it: 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 have between 208-230 volts. 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. [. . . ] recharged with the correct amount of refrigerant as listed on the nameplate of the ice machine, or performance will suffer. 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. August 1993 Page 29 NME1250 CIRCUIT BOARD TESTING Electrical Shock Hazard. Electrical power can cause personal injury. [. . . ]