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MYDAX 1M9W-S Instruction, Operations & Maintenance Manual

Water cooled chiller
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MYDAX, INC.
INSTRUCTION/OPERATIONS MANUAL
1M9W-S WATER COOLED CHILLER
Serial Number 120-07XX
12260 Shale Ridge Road
MYDAX, INC.
Auburn, CA 95602
(530) 888-6662
FAX: (530) 888-0962
March 2001

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  • Page 1 MYDAX, INC. INSTRUCTION/OPERATIONS MANUAL 1M9W-S WATER COOLED CHILLER Serial Number 120-07XX MYDAX, INC. 12260 Shale Ridge Road Auburn, CA 95602 (530) 888-6662 FAX: (530) 888-0962 March 2001...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS SPECIFICATIONS ....................... SYSTEM OVERVIEW ....................III. INSTALLATION ......................FRONT PANEL CONTROLS ..................…… ERROR MESSAGES ....................DIAGNOSTIC DISPLAYS ..................VII. SERVICE & WARRANTY ..................…. VIII. RESHIPPING & LONG-TERM STORAGE PREPARATION ..........… APPENDIX A: RS-232C SERIAL INTERFACE OPERATION APPENDIX B: DRAWINGS Lawrence Berkeley Laboratory...

  • Page 3: Specifications

    Mydax, Inc. 1M9W-S Water Cooled Chiller SPECIFICATIONS SYSTEM CAPACITIES Cooling Capacity @ +20°C 2500 Watts Coolant Temperature Setpoint Range +15°C to +25°C ± 0.05°C Coolant Output Temperature Stability Polypropylene Reservoir Volume 10 Gallons Recirculating Coolant Low Conductivity Water Coolant Flow/Pressure...

  • Page 4: System Overview

    Mydax, Inc. 1M9W-S Water Cooled Chiller SYSTEM OVERVIEW System Fluid Schematic Refer to drawing #B2343, the fluid schematic. The heart of the design is the evaporator valve. This is a thermal-electric expansion valve, controlled directly by the system's embedded microprocessor. Hermetically sealed, it consists of a spring-loaded needle valve in contact with a bimetallic plate.
  • Page 5 Mydax, Inc. 1M9W-S Water Cooled Chiller System Electrical Diagram Refer to drawing #B2344, the system electrical diagram. The central component of the electrical system is the M1001 controller. It is microprocessor-based and communicates with and/or controls various other circuit boards and components.

  • Page 6: Installation

    Mydax, Inc. 1M9W-S Water Cooled Chiller INSTALLATION POWER CONNECTION This chiller requires a 20 amp or larger circuit, 208/230 volt, 60 Hz, 3 phase and is equipped with a line cord and twist-lock L15-30P electrical plug. PLUMBING INTERFACE CONNECTIONS The chiller's 1" female pipe thread (FPT) fitting labeled "TANK OUT" must be plumbed to the inlet of the device to be cooled.

  • Page 7: Front Panel Controls

    1M9W-S Water Cooled Chiller FRONT PANEL CONTROLS All Mydax chillers are controlled by a microprocessor which is accessed via the system control panel. System controls are simple, yet powerful and in concert with built-in diagnostics and error messages, are exceptionally comprehensive.
  • Page 8 Mydax, Inc. 1M9W-S Water Cooled Chiller temperature, setpoint temperature and evaporator data view modes for multiple channel systems. "." (DECIMAL): Display shows model number and software revision date and copyright: 1M9W-S 2001.01.18 Copyright 2001 Mydax, Inc. RUN PUMP: Inactive in this system.

  • Page 9: Error Messages

    1M9W-S Water Cooled Chiller ERROR MESSAGES A unique feature of Mydax systems is the error messages displayed on the 2 by 40-character liquid crystal display (LCD). The microprocessor constantly checks various points and parameters throughout the system and automatically displays messages when error conditions are sensed.

  • Page 10: Diagnostic Displays

    1M9W-S Water Cooled Chiller DIAGNOSTIC DISPLAYS Mydax chillers are provided with a computerized self-diagnostic capability. This system is equipped with 9 different test panels, which are accessed by pressing the TEST key, followed by the test panel number. Diagnostic mode is...
  • Page 11 Mydax, Inc. 1M9W-S Water Cooled Chiller The center of the display shows readings for the RTD "Zero" and "Gain" calibration resistors. Precision resistors 100Ω and 120Ω (0.1% tolerance or better, representing ideal nominal RTD's) are used as a reference. Typical readings are shown.
  • Page 12 Mydax, Inc. 1M9W-S Water Cooled Chiller last history reset, the display reads "No Alarms". If alarms have occurred, the display shows them in sequence, like the main display. The history can be cleared 3 ways: 1. Power Off/On 2. Press START Key when unit is stopped 3.

  • Page 13: Service & Warranty

    SERVICE & WARRANTY If a unit malfunctions, please contact the Mydax Service Department as soon as possible. Many small problems can lead to large problems if not dealt with immediately. Please have the serial number and model number on hand when calling.

  • Page 14: Reshipping & Long-Term Storage Preparation

    Mydax, Inc. 1M9W-S Water Cooled Chiller RESHIPPING & LONG-TERM STORAGE PREPARATION Reshipped systems should be protected from freezing temperatures in shipment or serious damage may occur. Freezing temperatures can be encountered in air and over-mountain surface shipments in any month of the year. In-transit freeze- up can occur in the recirculating coolant loop and in a water-cooled condenser's cooling loop.
  • Page 15 The use of an embedded microprocessor allows Mydax to offer an RS-232C (remote) interfacing capability. Mydax systems can be controlled from a computer with either the MYDAX REMOTE Window's ™ software package or any control software of the user's choice. Full control and monitoring is possible, allowing complete system operation from any convenient location.
  • Page 16 Mydax, Inc. RS-232C COMMANDS The following ASCII commands can be transmitted to the system MPU via the RS-232C link: Enables RS-232C control. Disables RS-232C control. With remote disabled, system only responds to RO. Starts the compressor and pump. Stops the compressor and pump.
  • Page 17 Mydax, Inc. Causes transmission of the alarm status. For example: "ALARM: 0" denotes no alarm condition. Causes transmission of the alarm history status. For example: "ALHIS: 13" denotes one alarm. This history is the same as the Test 8 display. The history represents all alarms that have occurred since the last "Start"...
  • Page 18 Mydax, Inc. C) Set point Temperature in °C D) Calculated temperature in °C of the refrigerant line at the suction pressure transducer E) Pressure in PSIg of the refrigerant line at the suction pressure transducer F & G) Temperature in °C in the refrigerant line at the Superheat and Condenser RTDs H) Temperature in °C in the refrigerant line at the Discharge RTD (2-stage design...
  • Page 19 LOW FREON: Indicates pressure of refrigerant is low. Have unit serviced by Mydax or a qualified service center. RTD OPEN: Indicates that one of the system RTD's has failed and the system has shut down to protect itself.
  • Page 20 This page is intentionally left blank.
  • Page 21 Capillary Tubes Switch Water Flow Control Mydax, Inc. Auburn, CA Valve 1/2" 1M9W-S Chiller Fluid Schematic C o n d e n s e r Drain Cooling Water Water Cooled January 25, 2001 1.5 Gpm @ 75°F, P = 20 Psi D W G .
  • Page 22 Auburn, CA R L 1 Fill G n d T a n k R T D ' s 1M9W-S Chiller Electrical Diagram Keyboard RS-232 Connector Water Cooled January 25, 2001 D W G . B 2 3 4 4 , R e v 3...
  • Page 23 ResetN 4 MHz 22 23 21 to sheet 2 ResetN 8254AN TxRdy from sheet 2 RxRdy 8255N MREQN MREQN KEYN IOREQN 8254BN Mydax Inc. Auburn, CA. 8251N Mydax Controller M1001 'CPU' Nov 10, 1997 DWG. B2240 sheet 1 of 6...
  • Page 24 OUT 12 IN 2 OUT 8 IN 1 OUT 4 IN 0 OUT 0 MAX232 KEYN 5 ea. 1N914 KEY MATRIX (26 Keys) KEYN Mydax Inc. Auburn, CA. 74HC240 Mydax Controller M1001 Jan. 15, 1996 DWG. B2240-2 sheet 2 of 6...
  • Page 25 Dip Switch Switch 2 Switch 3 Res On/Off 100K On=Remote On=ext virtual On=Volt Set En. On=no Fudge Mydax Inc. Auburn, CA. Baud Mydax Controller M1001 Input-Output April 24, 1996 IN 7 IN 6 IN 5 DWG. B2240-3 sheet 3 of 6...
  • Page 26 J2-5 RA J1-3 FAN 2 J2-8 FAN 1 Out 0 J2-7 HTR 3 J2-10 HTR 2 J2-9 Out 12 Mydax Inc. Auburn, CA. HTR 1 PCLRN J2-12 Mydax Controller M1001 Output Dec 20, 1995 DWG. B2240-4 sheet 4 of 6...
  • Page 27 T3 Ext. Note: Mydax Inc. J4-13 Auburn, CA. 1. Resistors with * RTD X5 are 1/4W 1% metal film 30.1K 0.1% Mydax Controller M1001 DI Amp J4-11 10.0K 0.1% -15V Analog March 20, 2000 +15V DWG. B2240-5B sheet 5 of 6...
  • Page 28 +-10.24V - on on - on 8254BN +10.24V +5.12V 20.0K 0.1% Jumpers 10.0K 0.1% 20.0K 0.1% TL032CP Tank2 J4-7 AD7542KN Out24 (optional) Mydax Inc. Auburn, CA. Mydax Controller M1001 0.1uf 0.1uf Optional Jan. 15, 1996 -15V +15V DWG. B2240-6 sheet 6 of 6...
  • Page 29 120 0.1% "Gain" Gain DAC J1-23 100 0.1% "Zero" 1.27K 0.1% 0.01uf 100K 1. Resistor with * Mydax Inc. RA J1-3 are 1/4W 1% metal film Auburn, CA. 100K 1N914 RB J1-4 100K LT1001 RTD and Inputs M1002 RC J1-1...
  • Page 30 J2-9 24 Htr2 44 - PS2501-2 47 +5V J2-12 23 Htr1 2N2222 46 +5V J2-14 22 Alarm Mydax Inc. Auburn, CA. J2-16 21 Pump Power Supply M1004 J2-2 41 VFAN J2-13 20 Comp. June 19, 1996 DWG. B2244 sheet 1 of 2...
  • Page 31 Relay 4.7K 470K Jumpers BS170 0.1uf +15V 1N914 0.1uf "LOWAC" 0.1uf "Scale" Mydax Inc. Auburn, CA. Jumpers Note: Phase Detector M1004 1. Resistors marked with 1% 1/4W, all other resistors 0.1uf -15V April2 4, 1996 are 5% 1/4W. DWG. B2244-2...
  • Page 32 Heat Sinked Polyswitch 1N4002 1 watt 24 VAC Positive LM317T 250 mA @4.1 volt to Display LED backlight Common 1000uf Negative Mydax Inc. Auburn, CA. M1007 LED Power Supply Sept 24, 1997 DWG. D2729 sheet 1 of 1...
  • Page 33 Optional for G e m s F l o w m e t e r s Flow G n d Press. 0.0047 1 0 0 k Relay To J4-12 T2 Ext Flow In + 5 V A l a r m To J4-14 T1 Ext 10uf LM2907-8...