User manual SCOTSMAN FM1202

[. . . ] FM1202 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 machine 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 R-22 as the refrigerant. This manual covers both the "A" and the "B" models, as designated by the last letter in the model number. TABLE OF CONTENTS Installation For the Installer Specifications . [. . . ] Check the low side pressure, the low pressure cut out opens at pressure below 4 psig. Check if the auger is turning, if it is not, remove the gearbox and: Check for internal damage, repair and replace in the machine. Check for low charge, add some refrigerant, if the unit will operate, (normal low side pressure being about 25 psig) stop and look for a leak, repair, replace the drier, recover, evacuate, and weigh in the nameplate charge. If, with added charge, the unit does not operate: Check for a restricted system, replace the drier, recover, evacuate, and weigh in a nameplate charge. Check for a Thermostatic Expansion Valve that does not open, if defective, replace it. Replace the drier, recover, 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 400 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. Check the spout switch (a manual reset). It opens from excess pressure of ice inside the ice chute: this should only happen when the machine does not shut off when the ice storage bin is full. The machine will not run if there is not enough water in the reservoir. See the next step. August 1993 Page 19 FM1202 SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES H. Check: The gear motor, if it will not run, the compressor will not run. [. . . ] Minimal refrigerant discharged into the hoses equals minimal refrigerant discharged into the air. · If using recycled refrigerant, it must meet ARI way to determine the proper operation of the product. If the system was low on refrigerant, there is a leak, and it must be found and repaired. spec 700-88 or have been cleaned by a machine capable of attaining ARI spec 700-88. · Although this system uses R-22, it must not be vented to the atmosphere. · This system has a critical charge, it must be recharged with the correct amount of refrigerant as listed on the nameplate of the ice machine, or performance will suffer. · Anytime the refrigeration system has been opened, the dryer should be replaced. · When brazing the tubing connections to the thermostatic expansion valve, the component must be protected by heat sink material. August 1993 Page 29 FM1202 CIRCUIT BOARD TESTING ///////////////////////////////////////////////////////////////////////WARNING////////////////////////////////////////////////////////////////// These procedures require the machine to be connected to the power supply. The voltages of the electronic circuit are very low, but HIGHER VOLTAGES ARE PRESENT IN THE UNIT. [. . . ]