User manual SCOTSMAN NM1852R

[. . . ] NM1852R 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. 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. TABLE OF CONTENTS For the Installer Specifications . 35 Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow paper. December 1992 Page 1 NM1852R FOR THE INSTALLER The NM1852R is designed to fit the following Scotsman storage bins: · B90 and extentions, with bin top KBT18. When installing a new system, check to be sure that you have everything you need before beginning: · Correct Bin · Correct Ice Machine · Correct Bin Top · All kits, legs, and information required for the specific job. TOP VIEW Allow 6" of space behind the machine for utility connections. 18. 28" Ice Chute 6. 7" x 6. 2" 13. 84" 34. 84" BACK VIEW Liquid Line Connection (right system) 21" 3. 1" Discharge Line Connection (left system) Allow 6" above machine for service. There are two separate ice making and refrigeration systems in this model. [. . . ] The top bearing in the breaker should also be checked at least two times per year. Check the breaker bearing by: · removing the ice chute cover · unscrewing the ice sweep · removing the water shed · unscrewing the breaker cover (left hand thread) · unscrewing the auger stud BREAKER COVER December 1992 Page 22 NM1852R MAINTENANCE AND CLEANING In some areas the water supply to the icemaker will have a great deal of minerals in it, and that will result in an evaporator and auger becoming coated with these minerals, requiring a more frequent removal than twice per year. If in doubt about the condition of the evaporator and auger, the auger can be removed so the parts can be inspected. Note: Water filters can filter out suspended solids, but not dissolved solids. Check with a water treatment specialist regarding water treatment For more information on removal and replacement of these parts, see REMOVAL AND REPLACEMENT. Remove 3 hex studs holding ice chute cover to ice chute, and remove cover. Loosen band clamp under ice chute, and remove ice chute from evaporator. After the auger has been removed, allow the auger to dry; if the auger is not bright and shiny, it must be cleaned. Reverse to reassemble. ALLEN SCREWS BREAKER & BEARING & AUGER ASSEMBLY December 1992 Page 23 NM1852R SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES A. Check: The 2 reset switches (spout switch, or on prior models, the circuit board; and high pressure): depress and release each switch. If the unit still does not start, check the spout switch, or high side pressure. Check the high pressure cut out switch, if closed, go to E; if open: 1. Check the high side pressure, reset the switch and observe that the fan is forcing air through the condenser. If the pressures rise above the trip out point, and the unit shuts down: a. 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 that the fan blades are clean, and the fan secure to the fan motor shaft. Check the head pressure control valve, it should be maintaining a head pressure above 220 psig. If the unit has the correct charge, and the condenser is clean, and the refrigerant lines are not kinked or twisted, and the condenser is not overheated by external heat loads, the head pressure should be under the trip out point of the head pressure control switch. If all of the above are found to be good, and the machine trips out on high head pressure, replace the head pressure control valve. E. This switch will open if the bin control (ice level sensor) does not shut the machine off when the ice storage bin is full of ice: ice backs up in the ice chute, and internal pressure opens the switch, stopping the machine. If there is not enough water in the reservoir, the water level sensor will keep the machine from starting. a. If the machine does not start, see the next page. December 1992 Page 24 NM1852R SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES G. [. . . ] · Refrigerant must not be vented to the Extra care must be taken when recharging this remote system. DO NOT use the valves at the front of the unit for · This system has a critical charge, it weighing in the charge. All liquid R-22 must be weighed into the must be recharged with the correct receiver through the "front seated" king valve. amount of refrigerant as listed on the FRONT SEATED KING VALVE RECEIVER nameplate of the ice machine, or SERVICE PORT performance will suffer. [. . . ]