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Scotsman NME650R, Руководство по обслуживанию

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Scotsman NME650R Скачать руководство пользователя страница 14

COMPONENT DESCRIPTION: Control Box

Contactor:  A definite purpose contactor
connecting the compressor and the remote
condenser fan motor to the power supply.
Circuit Board:  The circuit board receives input
signals from several sensors and tranlsates them
to control the electrical power to the various loads.
The sensors inlcude:

••

ice level in the bin (with electric eyes)

••

Water level in the reservoir (with a thermisitor)

••

Amp draw of the auger drive motor

The loads include:

••

Liquid line coil

••

Auger drive motor

Pump Down Control: An automatic reset
pressure switch connected to the low side of the
refrigeration system. Controls the compressor.
Potential Relay:  The compressor start relay.
On/Off Switch:  Manual control for the machine.
 

CONTACTOR

ON/OFF SWITCH

PUMP DOWN CONTROL

POTENTIAL RELAY

TRANSFORMER

CIRCUIT

BOARD

NME650R

June 1994

Page 14

Содержание NME650R

Страница 1: ...1 FOR THE INSTALLER 2 REMOTE CONDENSER SPECIFICATIONS 4 FOR THE INSTALLER Remote Condenser 5 FOR THE PLUMBER 8 FOR THE ELECTRICIAN 9 FOR THE INSTALLER Completed Installation 10 START UP 12 COMPONENT...

Страница 2: ...Correct Bin Top All kits legs and information required for the specific job Model Dimensions W x D x H Basic Electrical Ice Type Refrigerant Type Refrigerant Charge Max Fuse Size Min Circuit Ampacity...

Страница 3: ...talled in a location where it has enough space around it to be accessible for service usually a minimum of 6 inches Try to avoid hot dirty and crowded locations Be sure that the location for the machi...

Страница 4: ...ine set 40 R 404A ICEMAKER NAMEPLATE LOCATED ON BACK PANEL SERIAL PLATE LOCATED BEHIND FRONT PANEL 19 7 8 23 13 16 Model Use with Basic Electrical RCE501 1 1 NME650R 115 60 1 ERC101 1 SAME 115 60 1 ER...

Страница 5: ...of precharged refrigerant lines either 25 foot or 40 foot consists of a 3 8 inch diameter liquid line and a 1 2 inch diameter discharge line Both ends of each line have quick connect couplings one en...

Страница 6: ...wrenches it is important that ONLY the nut on the precharged lines be turned the other parts of the couplings must NOT be allowed to turn or the process will tear out the diaphragms and they will be l...

Страница 7: ...E INSTALLER Location TYPICAL INSTALLATION REMOTE CONDENSER EXCESS PRECHARGED TUBING INSIDE BUILDING ICEMAKER SERVICE ACCESS SERVICE ACCESS SIDE AND BACK ROOF CUTAWAY WALL CUTAWAY NME650R August 1993 P...

Страница 8: ...he gravity type and 1 4 inch per foot fall is an acceptable pitch for the drain tubing There should be a vent at the highest point of the drain line and the ideal drain receptacle would be a trapped a...

Страница 9: ...the compressor and the fan motor operates whenever the compressor operates Electrical connections are made at the junction box at the back of the icemaker and at the junction box on the remote conden...

Страница 10: ...INSULATED PRECHARGED REFRIGERANT TUBING A typical installation should generally appear as illustrated below The remote condenser must be located above the icemaker and the precharged lines installed p...

Страница 11: ...f 20 psig 7 Has the machine been secured to the bin 8 If two units on one condenser has the relay kit been installed 9 Is there a water shut off valve installed near the machine 10 Is the remote conde...

Страница 12: ...sequence is now on automatic A There should be a short 15 second delay before the gearmotor starts B After the gearmotor starts the liquid line valve will open the low pressure control will close and...

Страница 13: ...out of Will shut the machine off it there is none Ice Discharge Chute Directs the ice produced by the evaporator into the storage bin Ice Level Sensor An electronic eye it senses the presence of ice i...

Страница 14: ...s inlcude ice level in the bin with electric eyes Water level in the reservoir with a thermisitor Amp draw of the auger drive motor The loads include Liquid line coil Auger drive motor Pump Down Contr...

Страница 15: ...ors for more than 15 seconds bin full At that point the bin empty light goes out and the machine shuts down Shut Down consists of The liquid line solenoid closes lowering the suction pressure The pump...

Страница 16: ...low or evaporator condensation is routed to the drain RESERVOIR DRAIN TUBE WATER LEVEL WATER INLET DRAIN Water Level The correct water level should be checked when the machine is making ice Locate the...

Страница 17: ...n the temperature of the evaporator warmer evaporators get more refrigerant and colder evaporators get less At the evaporator the refrigerant enters an area of relatively low pressure where it can eas...

Страница 18: ...frigerant into the condenser with a small amount of discharge gas going into the receiver to maintain pressure until the head pressure is built back up to the rated gauge pressure of 180 psig At that...

Страница 19: ...this point the refrigerant flow is stopped by the closed liquid line valve This action forces the refrigerant into the receiver and keeps it out of the compressor The pump down continues until the lo...

Страница 20: ...be between 90 and 115 degrees F 8 Slowly pour the cleaning solution into the water reservoir until it is full Wait 15 minutes then switch the master switch to ON 9 As the ice maker begins to use wate...

Страница 21: ...o 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 Insp...

Страница 22: ...specialist regarding water treatment For more information on removal and replacement of these parts see REMOVAL AND REPLACEMENT 1 To remove the auger remove the front and top panels 2 Move bail clamp...

Страница 23: ...gerant Charge 208 ounces of R 404A Typical Compressor Amp Draw 8 9 Typical Gearmotor Amp Draw 3 5 to 3 8 High Pressure Cut Out 450 PSIG Pump Down Pressure Switch after May 1995 production Opens at 15...

Страница 24: ...r 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 b Check the head pressure contr...

Страница 25: ...it board If the bin full light on the tester is ON move the tester switch to bin empty the light on the tester should go OFF and the bin empty light on the circuit board should go ON If not replace th...

Страница 26: ...ce in the machine b Check for low charge add some refrigerant if the unit begins to operate normal low side pressure being about 30 psig stop and look for a leak repair replace the drier evacuate and...

Страница 27: ...e restricted defective or not adjusted properly If needed replace the TXV evacuate and recharge per nameplate 4 Check the insulation on the evaporator It should be dry with no wet spots or frost If th...

Страница 28: ...emove reservoir from icemaker 8 Reverse to reassemble BIN CONTROLS Ice Level Sensors 1 Disconnect electrical power 2 Remove front panel 3 Remove control box cover 4 Locate ice chute at the base of the...

Страница 29: ...rough spots and damage a The bearing is pressed into the breaker to remove the bearing and replace it an arbor press is needed b Replace lower seals before installing new bearing in breaker Note seals...

Страница 30: ...er left hand threads b Unscrew auger stud from top of auger c Unscrew 4 allen head cap screws holding breaker to evaporator d Lift up on breaker to remove from auger If the auger is stuck Use a slide...

Страница 31: ...ace the snap ring and pull the water seal down against it 3 The part of the water seal that rotates with the auger must also be replaced Remove the old part from the auger and clean the mounting area...

Страница 32: ...the Evaporator and Auger 1 After the gearmotor has been inspected fasten the evaporator to the gear motor be sure that the number of shims indicated on the gear case cover is in place between the gea...

Страница 33: ...They are likely to be fine if the oil is If there is evidence of water in the oil rusty bearings and gears the oil having a creamy white appearance oil level too high carefully inspect the bearings an...

Страница 34: ...meplate of the ice machine or performance will suffer Anytime the refrigeration system has been opened the dryer should be replaced Note Only a HFC type dryer should be used When brazing the tubing co...

Страница 35: ...anufacturer if in doubt As with any other refrigerant do NOT mix HP62 with pressurized air when leak testing Pressure Temperature Chart for HP62 VAPOR VAPOR TEMP PRESSURE TEMP PRESSURE DEG F PSIG DEG...

Страница 36: ...ght on the tester IS on move the bin full switch to Bin Empty The light on the tester should go OFF and the Bin Empty light on the circuit board should go ON If the Bin Empty light is ON wait 10 20 se...

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