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Schreiber Engineering 300AC-MRI Owner's Manual

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***** SPECIAL FEATURE *****
This unit has been modified for
outdoor use
Any reference in 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

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Summary of Contents for Schreiber Engineering 300AC-MRI

  • Page 1 ***** SPECIAL FEATURE ***** This unit has been modified for outdoor use Any reference in 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...

  • Page 2: Model

    & & 300AC-MRI Model: 208/3 – 480/3 Voltage: 22 LBS R22 Ref. Charge: Tel: (562) 926-3855 Fax: (562) 926-0969...

  • Page 3: Table Of Contents

    Trouble Shooting – Part II ……………………………………………………………………….. 26 Chiller Parts Identification ………………………………………………………………………. Parts ……………………………………………………………………………………………… 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) 926-0969...
  • Page 6 WATER CHILLER STARTING CHECKLIST PROPER VOLTAGE Check the voltage on the chiller to see that it matches your power supply. CRANK CASE HEATER Power to the unit should be on for 3 hours prior to full usage to allow the crank case heater to heat the compressor.
  • Page 7 CONT. WATER CHILLER STARTING CHECKLIST ELECTRIC – POWER A good test to make sure power is off to the unit is to turn on the water pump switch. If power is on, the light on this pump will be on. We recommend you take caution in all judgments about the power being on.
  • Page 8 Electronic Controls Tank Fill Type: Air Cooled Notes: All motors have internal overload protection unless otherwise shown On all connections: L1 - Blue L2 - Black L3- Red Schreiber Engineering Corp. (562)-926-3855 12111 Park St. Cerritos, CA 90701 (562)-926-0969 Fax...

  • Page 9: Caution

    SETTING SOLID STATE CONTROL This unit has a solid-state control that controls the temperature on the refrigeration system. After the unit is wired to the proper voltage the control temperature and high temperature alarm can be set. On the front of this control is the temperature display, to set the temperature press and hold button #2 while turning the set point screw above button #2.
  • Page 10 SPECIAL CONTROL FEATURES Control LED’s for stage 1 & 2 will indicate "GREEN" when the DIS- CHARGE temperature is above their set point without time delay. Power LED's for compressor 1 & 2 will indicate "GREEN" when the contactor driver is ON after a call for cooling from the set point and after the time-delay has occurred.

  • Page 13: Chilled Water Distribution Piping

    CHILLED WATER DISTRIBUTION PIPING The chilled water distribution piping is an important factor in the performance of the water chiller. Proper piping will add to the LIFE of your chiller. This chiller is designed to be a containment free system. The chilled water piping should be the same. NO BLACK IRON PIPE.

  • Page 14: Installation Instructions

    INSTALLATION INSTRUCTIONS Air or Water Cooled Chillers When the chiller is received, check for any shipping damage. If any is found, a freight claim should be filed at once with the carrier. This water chiller is designed with a contaminant free chilled water system, stainless steel reservoir, and all copper evaporator.
  • Page 15 Check the voltage on the chiller to see that it matches your supply. When applying power to the water pump (by turning the manual switch on), make sure all the switches on the control panel are in the "off" position. It is necessary to check the rotation of the water pump.

  • Page 16: Special Instructions

    SPECIAL INSTRUCTIONS WATER PUMP The water pump is controlled by the manual switch for off and on operations. The motor on this pump has a built-in overload protection, as do all the motors in our system. ELECTRICAL CONTROLS - Control Circuit 24 Volts The control circuit for the refrigeration system has several controls wired in series.
  • Page 17 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.

  • Page 18: Refrigeration System

    Any repairs to the refrigeration system should be done by a qualified refrigeration company. Schreiber Engineering will always have a service engineer available to answer any questions regarding chiller service.
  • Page 19 FAN MOTOR SPECIFICATIONS Refer to your model number & voltage Model # H.P. Voltage Hz R.P.M. Overload Frame Mounting Rotation Blade QTY. 50AC 1/4 Hp 115/208/230-1 Ph. 60 1725 Automatic Rigid O.D.P. 14" x 16 Pitch 100AC 1/4 Hp 115/208/230-1 Ph. 60 1725 Automatic Rigid O.D.P.
  • Page 20 Installation, Operation and Maintenance Instructions. Model NPE/NPE-F DESCRIPTION & SPECIFICATIONS: The models NPE (close-coupled) and NPE-F (frame- mounted) are end suction, single stage centrifugal 2. Installation pumps for general liquid transfer service, booster applications, etc. Liquid-end construction is all AISI Type 304 stainless steel, stamped and welded.
  • Page 21 2.3.2. Place u nit in position on wedges located at 4. Discharge Piping: four points (two below approximate center of driver and two below approximate center of pump). Adjust 4.1. Arrangement must include a check valve located wedges to level unit. Level or plumb suction and between a gate valve and the pump.
  • Page 22 6.1.1. Single-phase motor: Non-reversible. 9.4.4. Remove impeller (101) by turning counter- 6.1.2. Three-phase motor: Interchange any two clockwise when looking at the front of the pump. power supply leads. Protect hand with rag or glove. CAUTION Failure to remove impeller in a counter-clockwise 7.
  • Page 24 WARNING Overcharging a refrigeration or air conditioning system can be dangerous. **** If a system refrigerant overcharge is sufficient to immerse the major parts of the motor and compressor in liquid refrigerant, a situation has been created which, when followed by unusual circumstances can lead to compressor housing seam separation or rupture.

  • Page 25: Service Bulletin

    SERVICE BULLETIN HERMETIC COMPRESSOR ELECTRICAL TERMINAL VENTING CAN BE DANGEROUS **** When the insulating material, which supports a hermetic compressor electrical terminal, suddenly disintegrates due to physical abuse or as a result of an electrical short between the terminal and the compressor housing, the terminal may be expelled, venting the vaporous and liquid contents of the compressor housing and system.
  • Page 26 Hermetic compressors can be properly serviced without unnecessarily removing the terminal PROTECTIVE COVER by adhering to the following service procedures: If the branch circuit, short circuit, and ground fault protective device, i.e., fuse or circuit breaker, is open, this is a strong indication that an electrical problem exists and must be found and corrected.
  • Page 27 Repeat #5 testing, carefully checking for ground, directly between each compressor terminal (C, S, & R) and ground. If once again a ground is indicated, proceed to properly replace the compressor, as it has failed and cannot be repaired. 10. It is important to note that a volt-ohmmeter may be used only to check the resistance and/or continuity of the motor windings.

  • Page 28: Crank Case Heaters

    The crank case heater is HIGH VOLTAGE. But it is only very low wattage. Caution should be taken when working on the crank case heater to make sure the POWER is off. Any question call for more details Schreiber Engineering Corporation 562-926-3855.

  • Page 29: Maintenance Information

    MAINTENANCE INFORMATION There are no lubrication points on the chiller. All motors have permanent lubrication in the bearings. The water that is used in the chilled water circuit has no special requirements, except that deionized water cannot be used. The water should be clean and some type of water conditioner can be used.

  • Page 30: Trouble Shooting - Part I

    TROUBLE SHOOTING - PART I SYMPTOM DIAGNOSIS REMEDY Check Power supply Correct circuit breaker Electrical circuit Repair or replace bad circuit Check Compressor won't run Line load voltage Correct voltage condition Temperature control Repair or replace Compressor overload Replace Low pressure switch Repair or replace High pressure switch Repair or replace...

  • Page 31: Trouble Shooting - Part Ii

    TROUBLE SHOOTING - PART II REFRIGERATION SYSTEM INTERNAL PRESSURE USING REFRIGERANT R-22 * High 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.

  • Page 32: Chiller Parts Identification

    CHILLER PARTS IDENTIFICATION...

  • Page 33: Parts

    PARTS LIST 300AC-220/3 460/3 M.R.I. UNIT If this unit has special feature(s) installed, see appendix for part number(s). Refrigeration Description Qty. R106 Compressor – 460/3 – 3 HP R122 Condenser – Air Cooled R131 Receiver – 1 – 3 Ton R140-3 Expansion Valve –...
  • Page 34 P145-2S Seal & “O” Ring Kit for Water Pump P149-WSGA Water Sight Glass Assembly - Full Assembly P151-1.0 Solenoid Valve Back Flow 1” P151-WSG Water Sight Glass Only P160-1.0 Check Valve P160-2 Stainless Steel Tank 3 Ton P155 Long Stem – Single Float Low Level K08.6P Back Flow Kit –...

  • Page 35: Limited Warranty

    Schreiber Limited Warranty Schreiber warrants the product described herein against defective material or workmanship for one year from the date of purchase. If any part is found to be defective within the war- ranty period, Schreiber, or its authorized service agent, will replace, or at Schreiber's options, re- pair the part free of charge for materials and labor.

  • Page 36: Special Features

    APPENDIX SPECIAL FEATURES...
  • Page 37 MRI SPECIAL FEATURES Manual Bypass This unit has an adjustable water by-pass. It can be adjusted in the field. This feature cuts down the amount of flow of water coming out of the water pump. Kit Number: K08.12 Discharge Pressure Gauge There is a water pressure gauge on the water discharge line of the water pump, reading the water pressure.

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