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REFRIGERATION SYSTEM: HP62 Refrigerant (R-404A)

THIS ICE MACHINE USES HP62 REFRIGERANT
AND POLYOLESTER COMPRESSOR OIL

DO NOT USE MINERAL OIL IN THIS
REFRIGERATION SYSTEM.

••

HP62 is a "Near Azeotrope", and therefore
liquid charging is required.

¤

Weigh into the discharge side as much of the
charge (as liquid) as possible.

¤

Install a sight glass between the suction side
and the gage manifold. Use the manifold
valve to "flash off" the balance of the
refrigerant charge before it enters the suction
side.

••

When the system is serviced, a special liquid
line dryer is required (see parts list).

••

Polyolester oil absorbs water very easily, and
therefore when the system is opened for
service, it must be re-sealed as soon as
possible (15 minutes maximum).

••

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 with
air for leak testing.

                        VAPOR                              VAPOR
  TEMP.      PRESSURE     TEMP.       PRESSURE
(DEG F)         (PSIG)         (DEG F)            (PSIG)

-20 . . . . . . 17

70 . . . . . . . 146

-18 . . . . . . 18

72 . . . . . . . 150

-16 . . . . . . 20

74 . . . . . . . 155

-14 . . . . . . 21

76 . . . . . . . 161

-12 . . . . . . 23

78 . . . . . . . 166

-10 . . . . . . 24

80 . . . . . . . 171

-8 . . . . . . . 26

82 . . . . . . . 177

-6 . . . . . . . 28

84 . . . . . . . 182

-4 . . . . . . . 29

86 . . . . . . . 188

-2 . . . . . . . 31

88 . . . . . . . 194

0 . . . . . . . 33

90 . . . . . . . 200

2 . . . . . . . 35

92 . . . . . . . 206

4 . . . . . . . 37

94 . . . . . . . 212

6 . . . . . . . 39

96 . . . . . . . 219

8 . . . . . . . 41

98 . . . . . . . 225

10 . . . . . . . 43

100 . . . . . . 232

12 . . . . . . . 46

102 . . . . . . 239

14 . . . . . . . 48

104 . . . . . . 246

16 . . . . . . . 50

106 . . . . . . 253

18 . . . . . . . 53

108 . . . . . . 260

20 . . . . . . . 55

110 . . . . . . 268

22 . . . . . . . 58

112 . . . . . . 275

24 . . . . . . . 60

114 . . . . . . 283

26 . . . . . . . 63

116 . . . . . . 291

28 . . . . . . . 66

118 . . . . . . 299

30 . . . . . . . 69

120 . . . . . . 307

32 . . . . . . . 72

122 . . . . . . 316

34 . . . . . . . 75

124 . . . . . . 324

36 . . . . . . . 78

126 . . . . . . 333

38 . . . . . . . 81

128 . . . . . . 342

40 . . . . . . . 85

130 . . . . . . 351

42 . . . . . . . 88

132 . . . . . . 360

44 . . . . . . . 91

134 . . . . . . 370

46 . . . . . . . 95

136 . . . . . . 379

48 . . . . . . . 99

138 . . . . . . 389

50 . . . . . . . 102

140 . . . . . . 399

52 . . . . . . . 106

142 . . . . . . 409

54 . . . . . . . 110

144 . . . . . . 420

56 . . . . . . . 114

146 . . . . . . 430

58 . . . . . . . 118

148 . . . . . . 441

60 . . . . . . . 123

150 . . . . . . 452

62 . . . . . . . 127

152 . . . . . . 464

64 . . . . . . . 132

154 . . . . . . 475

66 . . . . . . . 136

156 . . . . . . 487

68 . . . . . . . 141

158 . . . . . . 499

Pressure-Temperature Chart for HP62

CME250

August 1994

Page 23

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Содержание CME250

Страница 1: ...els use polyolester refrigerant oil Information on HP62 is located on page 23 Table of Contents Specifications page 2 Limitations page 3 Installation page 4 Plumbing page 6 Final Check List page 8 Component Location page 9 Initial Start Up page 11 Electrical Sequence page 12 Cleaning page 13 Water Refrigeration Schematic page 16 Technical Characteristics page 18 Service Diagnosis page 19 Removal a...

Страница 2: ...550 HTB500 HTB350 HTB250 BH800 with bin top KBT23 BH900 with bin top KBT22 BH1360 It will also fit these Scotsman Dispensers CD200 IS150 with KADCM1 RS150 with KADCM1 These smaller bins are recommended There is an optional stainless steel panel kit SPKCMD 1 for this machine CME250 Cabinet Model Number Dimensions W x D x H Condenser Type Basic Electrical Minimum Circuit Ampacity Maximum Fuse Size o...

Страница 3: ...safety and performance They meet or exceed the standards of UL NSF and CSA Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman that have been altered in any way including the use of any part and or other components not specifically approved by Scotsman Scotsman reserves the right to make design changes and or improvements at any time Specifications and...

Страница 4: ...transforms it into a food product ice The purity of the water is very important in obtaining pure ice and in maximizing product life The water to the ice machine should be filtered Water filters vary greatly in ability and function Install one that filters out suspended solids to a dimension of 5 microns or less The finer the filter the better but finer filters may plug up sooner than course ones ...

Страница 5: ...nd the cube drop area The end of the bin thermostat bracket with the plastic tubing on it will fit into the hole in the base of the machine 3 Locate and uncoil a portion of the bin thermostat capillary tube Route the end of the capillary tube into and through the bin thermostat bracket tube It should be inserted the full length of the tube but not past the end Stacking This machine will stack onto...

Страница 6: ...s the bin drain and the other is the reservoir drain The reservoir drain is a 3 4 F P T brass fitting Drain tube material must be rigid and meet local code Traps in the bin drain line without vents ahead of them will cause poor draining The bin drain must be vented if there is a long horizontal run 5 or more The reservoir drain must be vented and not connected to the bin drain All drains are gravi...

Страница 7: ...cuit breakers Electrical connections are made at the rear of the ice maker inside the junction box Recommendation If using wire nuts cut tinned portion of connecting wires off and strip 1 2 of insulation from the end of each wire Follow All Local Codes This Unit Must Be Grounded Usually a licensed electrician will be required to connect the electrical service Hand Disconnect Switch Junction Box CM...

Страница 8: ...ections been checked for leaks 7 Is the cabinet level 8 Is the ice machine connected to a 115 volt electrical power supply and is the ice machine the only load on that circuit 9 Has all of the shipping material been removed from the inside of the cabinet 10 Has the bin thermostat bracket been attached to the bottom of the ice machine and the capillary tube routed thru the bracket 11 Has the bin an...

Страница 9: ...porators Water distributor Control box with cube size control adjustment ON OFF switch Compressor switch Inside the control box is control system for the ice machine Timer Cube Size Control Master Switch Compressor Switch Bin Thermostat Water Distributors Drain Trough Bin Thermostat Bracket Water Inlet Valve Water Pump Bin Thermostat Control Box Component Location Overflow Standpipe CME250 August ...

Страница 10: ...ves to ensure full sized ice cubes with each harvest cycle Timer Timer Switch Assembly The function of the timer begins when activated by the cube size control The outer surface or large diameter lobe of the timer cam determines the timer cycle for finish freezing of the ice cubes while the inner surface or small diameter lobe determines the time cycle for the harvest cycle When the microswitch bu...

Страница 11: ...e the water cooled discharge pressure must be 245 P S I G Check discharge pressure and adjust water regulating valve to obtain 245 P S I G discharge pressure 8 The water temperature in the reservoir will soon be 320 F and ice should begin to form on the evaporators Note In some cases some slush will form in the reservoir This is temporary and normal 9 Allow the ice machine to operate for about 20 ...

Страница 12: ...the bin control circuit by holding ice on the bin control tube in the bin This simulates bin full and the ice machine should switch itself off at the end of a harvest cycle 13 Replace all the panels The ice machine is now ready for automatic operation Electrical Sequence This describes the sequence through a complete cycle Freeze Cycle During the first part of the freeze cycle the ice machine comp...

Страница 13: ...r cooled only 1 Remove the grill on the right side of the unit 2 Remove the filter pad from in front of the condenser 3 Wash the surface of the filter off with cold water or if torn or so dirty it can t be cleaned replace with a new filter 4 Return the filter to its installed position 5 Replace the grill Do not operate the unit without the filter in place Note If the unit has been operated without...

Страница 14: ...ff the liner 3 After the scale has been removed rinse all surfaces inside the bin with clean potable water Stainless Steel Components Inside Bin The stainless steel parts in the bin also require periodic cleaning Chemicals in the water supply such as chlorine cause brown stains to appear on the surface of the stainless steel parts 1 General Cleaning staining is usually removed by washing the parts...

Страница 15: ...ter and compressor switches ON 16 Replace the front panel 17 Discard the next batch of cubes to make sure all of the acid sanitizer is gone CAUTION DO NOT use ice cubes produced from the cleaning or sanitizing solutions Be sure none remain in the bin 18 Pour hot water into the storage bin to melt the cubes and also clean out the bin drain 19 Wash the bin liner with a solution of household bleach 1...

Страница 16: ...he evaporator and the water flowing over it From the evaporator the refrigerant flows back to the compressor through the suction line Water Schematic Water flows into the ice machine from its inlet connection at the back of the cabinet through the inlet water valve and into the reservoir The water in the reservoir is pumped up and through the water distributor tube at the top of the evaporators Fr...

Страница 17: ...the evaporator enough to allow the surface of the ice frozen to the evaporator to melt The remaining ice will then fall off into the bin During the Harvest Cycle the inlet water valve opens filling the reservoir and allowing the reservoir to overflow the drain Inlet Water Valve OPEN Water Pump Evaporator Water Distribution System Hot Gas Valve OPEN Suction Line Liquid Line Condenser Dryer Compress...

Страница 18: ...86 PSIG Air cooled 100 PSIG 90o F air and 70o F water Typical Discharge pressure in harvest Water cooled 160 PSIG Air cooled 200 PSIG 90o F air and 70o F water Hi Pressure Cut Out Point 450 PSIG air cooled 400 PSIG water cooled Fan Pressure Switch 240 PSIG C I 190 PSIG C O Hi Temperature Cut Out Point 140o F at hot gas valve Typical Compressor Amp Draw 10 13 during the freeze cycle and 11 14 durin...

Страница 19: ...ter turned off Reconnect water supply No water due to water filter plugged Replace water filter No water due to inlet water valve screen plugged Clean out inlet screen No water due to strainer screen plugged Clean out inlet screen No water due to Inlet water valve coil open Replace valve No water due to inlet water valve will not open Replace valve Water in reservoir but no water over evaporators ...

Страница 20: ...r faulty fan motor fan pressure switch not enough water thru water cooled condenser Check for causes of high discharge pressure and correct Inlet water temperatures and room ambient very high Advise user suggest additional room cooling Compressor inefficient Check replace compressor Cubes are wrong size shape Cube size control not adjusted properly Adjust cube size control Water system is restrict...

Страница 21: ...ff the posts of the cube size control 7 Follow the capillary tube of the cube size control and remove it from the grommet in the back of the control box 8 Locate bulb on suction line 9 The end of the cube size control is inserted in a socket attached to the suction line Pull it out of the socket 10 Replace the cube size control with the proper part number following the above steps from 9 1 Electri...

Страница 22: ...e 6 Remove bracket from pump 7 Reverse above steps to replace Inlet Water Valve The valve water to enter the reservoir during harvest but not during freeze The valve may plug up from minerals in the water and may be cleaned rather than replaced 1 Shut off the water supply 2 Unscrew the fitting at the back of the valve and pull the water inlet tube out of the valve body 3 Remove the screws holding ...

Страница 23: ...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 with air for leak testing VAPOR VAPOR TEMP PRESSURE TEMP PRESSURE DEG F PSIG DEG F PSIG 20 17 70 146 18 18 72 150 16 20 74 155 14 21 76 161 12 23 78 166 10 24 80 171 8 26 82 177 6 28 84 18...

Страница 24: ...laced into a Scotsman ice machine meet ARI spec 700 88 Reclaim programs are available through most refrigerant wholesalers Access Valves To use the access valves Remove the cap from the stem use a 3 16 allen wrench to check that the valve is CLOSED Then remove the core cap Close the valve and replace the caps when the job is finished The valve must be closed and the caps must be on or the valve wi...

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