Schreiber Engineering 300AC-MRI Owner'S Manual Download Page 17 | Manualshive

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CHILLED WATER CIRCUIT

The chilled water is pumped from the chiller's water tank to the discharge outlet of the
chiller. Then from the discharge outlet, the water travels to the object to be cooled,
through the heat exchanger, and returns through the chillers return line into the water
tank. Be sure to keep all lines full size (1"). If the size of the lines are reduced, then the
flow of water will be restricted, and thus resulting in improper chilling.

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Summary of Contents for 300AC-MRI

Page 1: ...this manual stating cannot be used for outdoor installation does not apply to this unit The following feature has been added for this purpose Head Pressure Controls Kit Number K08 61 Electronic Remote Controls Kit Number Number K05 3 With 150 feet of Remote Wire Kit Number K09 1F ...

Page 2: ... AL LL LA AT TI IO ON N O OP PE ER RA AT TI IO ON N M MA AI IN NT TE EN NA AN NC CE E O OW WN NE ER RS S M MA AN NU UA AL L Model 300AC MRI Voltage 208 3 480 3 Ref Charge 22 LBS R22 Tel 562 926 3855 Fax 562 926 0969 ...

Page 3: ... Instructions 11 Fan Motors 14 Water Pump 15 Refrigeration System 19 Service Bulletin 20 Crank Case Heaters 23 Maintenance Information 24 Trouble Shooting Part I 25 Trouble Shooting Part II 26 Chiller Parts Identification 27 Parts 28 Limited Warranty 29 Special Feature s Appendix Schreiber Engineering Division of Dova Tech Ltd 12111 East Park Street Cerritos CA 90703 Phone 562 926 3855 Fax 562 926...

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Page 6: ...ck off the shaft To test if the water pumps are rotating in the correct direction turn the pump switch on and off quickly The compressor switch is used to test the fan motors rotation The compressors to this unit always run in the correct rotation SERVICE ACCESS PANEL The service access panel must be in place when the unit is running If it is not in place the unit will cut off on the high pressure...

Page 7: ... cause a pilot light to be out and still have voltage to the unit TESTING STANDARDS All components on the chiller meet UL s standards The system is tested under 250 pounds of pressure All motors have internal overload protection except where noted ANTIFREEZE Keep the water tank filled at the proper level Add antifreeze if you are going to operate the unit at 380 F or lower DEIONIZED WATER DO NOT U...

Page 8: ...rks Electronic Controls Tank Fill 200AC 500AC 24 VAC G round Low Lev Pum p Comp 1 TC INPUTS RETURN DISCHARGE NC CO M NO ALARM TIME DELAY 4 2 1 0 1W 1C T1 T2 T3 T1 T2 T3 T1 T2 T3 24V RED Low Level Float RED 1W 1C Water Pump Starter Coil Compressor 1 Starter Coil Compressor 1 Low Pressure Switch Compressor 1 High Pressure Switch Temp Probes Ye llo w Y ellow Black R ed L3 L2 L1 6 5 4 3 7 8 1 2 R R 2 ...

Page 9: ...temperature alarm does not function when the compressor and water pump switch is in the off position for example during the night shut down When the compressor and water pump switch is turned on in the morning the alarm will not sound even if the water temperature is above the set point however the red fault light number four on page 8 will remain on until a temperature below the set point is reac...

Page 10: ... the alarm condition exists unless the alarm silence button is pressed 6 The audio buzzer will have a disable OFF ON selection jumper on the back side disabling may be required when alarms are being monitored remotely 7 The LOW COOLANT indicator will light RED when the float switch contacts open This condition will turn off or inhibit the COMPRESSOR and PUMP drivers Power indicators will turn OFF ...

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Page 13: ...apacity in the movement of the chilled water and there is no rusting Copper line will prevent any rusting but there is greater heat loss You might want to insulate these lines 3 Should the water chiller be installed next to your cooling load We would suggest rubber hose This would prevent any great heat loss And there would also be no contamination 4 If black pipe galvanize iron and steel pipe are...

Page 14: ...e air cooled condenser or water to the water cooled unit will not only affect the efficiency of the unit but will also cause damage to the refrigeration system Note Do not mix up the inlet and the outlet to the condenser on water cooled units Water cooled takes 3 gpm per ton 4 Make sure the ceiling above the fan discharge is over 12 feet to avoid recirculation of the condenser air because recircul...

Page 15: ... switch must be on in order to check rotation of fan motor The refrigeration system will not run unless the water pump switch is in the on position Set the temperature controller to the desired temperature If the temperature is set below 36 F antifreeze must be added to the water supply tank Use non automotive antifreeze which can be added through the overflow pipe Never add more antifreeze than n...

Page 16: ...pressure switch will cut out at any time the pressure in the refrigeration system is below 25 psi Low psi can be caused by a freeze up in the water tank a leak in the refrigeration system if the system is low on Freon R 22 or if there is any sort of restriction in the system If the switch cuts out it will automatically reset Never try to adjust the high and low pressure switches or by pass them or...

Page 17: ...n from the discharge outlet the water travels to the object to be cooled through the heat exchanger and returns through the chillers return line into the water tank Be sure to keep all lines full size 1 If the size of the lines are reduced then the flow of water will be restricted and thus resulting in improper chilling 12 ...

Page 18: ... will always have a service engineer available to answer any questions regarding chiller service This unit has a service valve on the suction and discharge line The suction line has its valve on the suction line The high pressure or discharge service line is on the receiver This unit is charged with R 22 DO NOT OVERCHARGE because this will cause damage to the compressor The refrigeration sight gla...

Page 19: ...230 460 3 Ph 60 1140 Automatic F56 Rigid O D P CW 18 x 24 Pitch 2 800AC 1 2 Hp 208 230 460 3 Ph 60 1140 Automatic F56 Rigid O D P CW 18 x 24 Pitch 2 1001AC 1 2 Hp 208 230 460 3 Ph 60 1140 Automatic F56 Rigid O D P CW 18 x 24 Pitch 2 1000AC 1 2 Hp 208 230 460 3 Ph 60 1140 Automatic F56 Rigid O D P CW 18 x 24 Pitch 2 1250AC 1 2 Hp 208 230 460 3 Ph 60 1140 Automatic F56 Rigid O D P CW 18 x 24 Pitch 2...

Page 20: ...phase Thermal protection for single phase units is sometimes built in check nameplate If no built in protection is provided use a contactor with a proper overload Fusing is permissible 1 5 2 Three phase Provide three leg protection with properly sized magnetic starter and thermal overloads 1 6 Maximum Operating Limits Liquid Temperature 212F 100C with standard seal 250F 120C with optional high tem...

Page 21: ...ion strainer open area must be at least triple the pipe area 3 6 Size of the inlet from liquid source and minimum submergence over inlet must be sufficient to prevent air from entering pump through vortexing See figs 2 5 4 1 Arrangement must include a check valve located between a gate valve and the pump The gate valve is for regulation of capacity or for inspection of the pump or check valve 4 2 ...

Page 22: ...ve cap at opposite end of motor A screwdriver slot or a pair of flats will be exposed Using them will prevent impeller damage 9 4 4 Remove impeller 101 by turning counter clockwise when looking at the front of the pump Protect hand with rag or glove CAUTION Failure to remove impeller in a counter clockwise direction may damage threading on the impeller shaft or both 9 4 5 With two pry bars 180 apa...

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Page 24: ... refrigerant liquid overcharge causing a rapid increase in system pressure c If the system compressor protective devices fail for any reason prior to or during this locked rotor heating cycle or cycles liquid refrigerant may be vaporized sufficiently fast enough to raise the pressure within the system to extremes far in excess of the housing or weld seam design limits d In some instances where the...

Page 25: ...cient contaminant air present in the system and an electrical arc occurs as the terminal vents Ignition cannot occur at the venting terminal without the presence of contaminant air and cannot occur externally from the venting terminal without the presence of an external ignition source It is therefore essential that any air in a refrigeration air conditioning or heat pump system be completely remo...

Page 26: ...nal to vent 3 DISCONNECT all power to the unit making sure all power legs are open 4 Without removing the terminal PROTECTIVE COVER disconnect the three leads going to the compressor terminals at the nearest point to the compressor and identify them as Common C Start S and Run R Identification can generally be made through the unit wiring diagram DO NOT disconnect at the compressor terminals at th...

Page 27: ...phases Therefore allow time for reset b For external overload protected motor compressors the continuity of the overload may be checked The resistance of all winding may also be checked i e C S C R and S R c Any lack of continuity other than test indicating an open internal protector or improper resistance indicates a faulty or damaged motor and the compressor must be properly replaced as it has f...

Page 28: ... turn the water pump or refrigeration compressor off you must only use the manual switches on the electrical enclosure as marked When you use the disconnect to turn the unit off you kill the power to the crank case heaters ONLY use the disconnect to turn off power if you are going to work on the electrical system AN IMPORTANT FACTOR READ SPECIAL INSTRUCTIONS FOR CRANK CASE HEATER When the unit is ...

Page 29: ...pump could be hot enough to injure one touching these components 6 The dial thermometer is reading the temperature of the discharge chilled water 7 Please note This is a hermetically sealed compressor There are no necessary maintenance requirements Please read the service bulletins before making any repairs 24 NOTICE ON EXPANSION VALVE This is a standard Alco Expansion Valve Model TLCE size HW The...

Page 30: ...or runs No refrigeration Refrigerant leak Stuck expansion valve Repair leak and recharge Replace expansion valve High pressure trips Condenser motor Air over condenser restricted Service panel not in place Repair or replace motor Clean condenser Install service panel Low pressure switch Cutting out Defective expansion Refrigerant leak Replace expansion valve Repair leak Temperature too high Dial t...

Page 31: ... Pressure Switch Manual Reset Cut out at 425 P S I Low Pressure Switch Automatic Reset Cut out at 25 P S I WORKING REFRIGERANT PRESSURES R 22 High Pressure 185 to 325 P S I Low Pressure 45 to 70 P S I NOTE These pressures are under normal ambient temperatures and chilled water temperatures 26 ...

Page 32: ...CHILLER PARTS IDENTIFICATION 27 ...

Page 33: ...haft Only 1 E103 Contactors 30 Amps 2 E104 4 Point Terminal Block 1 E110 12 Terminal Block 12 Point 2 E113 Transformer 440 3 1 E115 Grounding Screw 1 E122 Off On Switch 2 E124 3 Pilot Light Bulb 24V 2 E126 Pilot Light Assembly All Units Green Lens 2 E128A1 Single Stage w LLVL RA 1 E128P D Discharge Probe Wire 7 ft E128P R Return Probe Wire 8 ft E129 Low Ambient Controls 1 CA128 RB Remote Control B...

Page 34: ...ss Assembly Full Assembly 1 P151 1 0 Solenoid Valve Back Flow 1 1 P151 WSG Water Sight Glass Only 1 P160 1 0 Check Valve 1 P160 2 Stainless Steel Tank 3 Ton 1 P155 Long Stem Single Float Low Level 1 K08 6P Back Flow Kit Half Ton 3 Ton 1 K08 12 1 2 Manual By Pass Kit 1 ...

Page 35: ...its authorized service agent will replace or at Schreiber s options re pair the part free of charge for materials and labor This warranty does not cover damage caused by misuse accident abuse incorrect installation or operation In addition it does not cover damage occurring during transit or damage caused by or resulting from repair or modifications carried out by anyone other than Schreiber or it...

Page 36: ...APPENDIX SPECIAL FEATURES ...

Page 37: ...trol panel will illuminate On models with standard controls a low level condition illuminates the low level warning lamp only There is no cut out Water must be added immediately or the unit can be severely damaged For both control styles normal operation will resume when the tank is filled Kit Number K08 23 Top Fill A 2 top fill port has been added to the top of this unit instead of automatic wate...

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