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Scotsman NM1852RH, Manual

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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 NM1852RH (remote high side) is the
freezer portion of a commercial ice machine. It
is designed to be connected to the

condensing section of a refrigeration system,
specifically a supermarket R-22 system. It
consists of two evaporators, two gearmotors,
two liquid line valves, two control boxes, two
thermostatic expansion valves, and an EPR
valve.

For the Installer .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 2

For the Electrician

 .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 4

For the Plumber  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 5

Final Check List  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 6

Initial Start Up  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 7

Component Identification .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 8

Electrical Sequence  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 11

Operation

 .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 12

Maintenance and Cleaning .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 14

Service Diagnosis

 .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 17

Removal and Replacement

Bin Controls and Reservoir  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 20

Bearing and Breaker  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 21

Auger  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 22

Water Seal

 .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 23

Evaporator

 .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 24

Gearmotor .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 25

Circuit Board Tester  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Page 26

Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper.

NM1852RH

August 1992

Page 1

Summary of Contents for NM1852RH

Page 1: ...tors two liquid line valves two control boxes two thermostatic expansion valves and an EPR valve For the Installer Page 2 For the Electrician Page 4 For the Plumber Page 5 Final Check List Page 6 Init...

Page 2: ...y and performance They meet or exceed the standards of U L N S F and C S A Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman that have been altered in a...

Page 3: ...dge and using a mechanical lift install the NM1852RH onto the top of the storage bin assembly Fasten the ice machine to the bin using 4 5 15 18 2 5 cap screws Level the assembly by a Turning the leg l...

Page 4: ...diagram The ice machine should be connected to its own electrical circuit and be individually fused Voltage when the unit is under full load must remain within the limitations listed on page 2 LOW VOL...

Page 5: ...ween the ice maker and the water supply Drain System All drains are of the gravity type and must have a minimum of 1 4 fall per foot of horizontal run The drains must be installed to conform to local...

Page 6: ...n removed from inside the cabinet 6 Have the electrical connections been made 7 Have the drains been installed and checked for leaks 8 Has the refrigeration supply been installed and checked for leaks...

Page 7: ...make ice Water flows from the water reservoir and the float drops letting in more water 7 Switch on the other master switch observe that The liquid line valve opens The gearmotor runs Within a short...

Page 8: ...80 F Measure the temperature of the evaporator outlet at the TXV bulb and check the low side pressure at the EPR valve about 24 PSIG Convert the pressure to temperature using a temperature pressure ch...

Page 9: ...l The relays are for the gear motor with a built in time delay to clear the evaporator of ice when the unit turns off and for the liquid line valve Transformer Supplies low voltage to the circuit boar...

Page 10: ...ing action being where the two seal faces meet Ice Sweep A plastic cap with fingers It revolves with the auger to sweep the ice into the ice chute Divider Where the ice is compressed and much of the e...

Page 11: ...unless the ice stays between the sensors 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 relay opens The...

Page 12: ...through the float valve The water then goes out the bottom of the reservoir tank to the bottom of the evaporator Reservoir overflow or evaporator condensation is routed to the drain WATER INLET DRAIN...

Page 13: ...hermostatic expansion valve meters the liquid refrigerant into the evaporator where it boils off evaporates and absorbs heat It then moves through the ball valve and into the evaporator pressure regul...

Page 14: ...and Hydroxyacetic acids These compounds are corrosive and may cause burns If swallowed DO NOT induce vomiting Give large amounts of water or milk Call Physician immediately In case of external contac...

Page 15: ...from the reservoir and the tip wiped clean of mineral buildup 3 The bearing in the breaker should also be checked at least two times per year Check the bearing by removing the ice chute cover unscrewi...

Page 16: ...on on removal of these parts see REMOVAL AND REPLACEMENT 1 To remove the auger remove front and top panel If top panel cannot be removed or if there is less than 6 clearance over the top of the machin...

Page 17: ...C Check the spout switch 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 This switch must be manua...

Page 18: ...n the tester to the full position The bin full light on the tester should be ON if not replace the circuit board If the bin full light on the tester is ON move the tester switch to bin empty the light...

Page 19: ...at the liquid line valve coil Check for an open wire between the relay and the valve 2 Check the valve coil If the coil is open replace the liquid line valve 3 Check the auger drive motor centrifugal...

Page 20: ...servoir 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 chute i...

Page 21: ...ng breaker to evaporator d Lift up and remove breaker bearing assembly from auger evaporator 6 Service the bearing Check for rust rough spots and damage a The bearing is pressed into the breaker to re...

Page 22: ...breaker to evaporator d Lift up and remove breaker from evaporator e If the auger is stuck use a slide hammer type puller to pull on the auger at the threaded hole The size of that hole is 5 8 18 Ins...

Page 23: ...y past the grove for the snap ring 2 Replace 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 fr...

Page 24: ...an new drier in the liquid line 7 Evacuate the system until dehydrated then weigh in the nameplate charge Check for leaks 8 Install auger breaker breaker bearing assembly and ice discharge chute in r...

Page 25: ...h removal of the water seal have been performed 1 Remove the electrical wires from the gear drive motor 2 Unscrew the 4 cap screws holding the gearmotor to the gearmotor plate 3 Remove the gearmotor f...

Page 26: ...properly aligned clean and not obstructed use the tester as follows Bin Control Note All testing is done with the electrical power on the master switch on and all reset switches reset 1 Unplug photo t...

Page 27: ...t replace the circuit board b Move the water switch on the tester to the Water position The No Water light on the board should go OFF If not replace the circuit board If the light does go off replace...

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