User manual SCOTSMAN NME650R

[. . . ] NME650R 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 NME650R is a remote condenser modular ice system that fits a variety of Scotsman 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 INTRODUCTION . 9 FOR THE INSTALLER: Completed Installation START UP . [. . . ] Check: The reset switch (high pressure): depress and release the switch. If the unit still does not start, check the high side pressure. Check the high pressure cut out switch. 1. Check the high side pressure, reset the switch and observe that the fan is forcing air through the condenser. If the switch opens at pressures below 450 psig, replace the switch. 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 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 head pressure control valve, it should be maintaining a head pressure above 180 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. If there is not enough water in the reservoir, the water level sensor will keep the machine from starting. a. Check the water level, restore/adjust if low. Check the water level sensor, clean if dirty, (see maintenance). If the machine does not start, see the next page. June 1994 Page 24 NME650R SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES F. 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 . 1. 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. If the line side has the correct voltage and the load side does not, replace the transformer. [. . . ] · Special leak detection equipment is required to locate small refrigerant leaks. Usually a leak detector capable of detecting a Halogenated refrigerant or HFC-134A will work. Check with the leak detector manufacturer if in doubt. · As with any other refrigerant, do NOT mix HP62 with pressurized air when leak testing. Pressure-Temperature Chart for HP62 TEMP. [. . . ]