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MCS -8 User Manual

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MCS-8
HEAT PUMP MANUAL
Version 7
Revision 4.0
Software HPMP 7.00-U and greater
Supports MCS-STAT
The MCS Commitment
Our commitment is to provide practical solutions for the industries needs and to be both a leader and partner in the
effective use of microprocessor controls.
Micro Control Systems, Inc.
5400-1 Division Drive
Fort Myers, Florida 33905
(239) 694-0089
FAX: (239) 694-0031
www.mcscontrols.com
Information contained in this manual has been prepared by Micro Control Systems, Inc. and is company confidential and
copyright © protected 1996. Copying or distributing this document is prohibited.

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  • Page 1 Revision 4.0 Software HPMP 7.00-U and greater Supports MCS-STAT The MCS Commitment Our commitment is to provide practical solutions for the industries needs and to be both a leader and partner in the effective use of microprocessor controls. Micro Control Systems, Inc.

  • Page 2: Revision Page

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 1 Revision Page Date Author Description of Changes 9/4/97 Kelly Mitchell Draft 5/1/98 Kelly Mitchell Updated manual for release version 1.0 5/12/98 R C Toney Update for Empire State Bldg. changes version1.1...

  • Page 3: Table Of Contents

    2 Table of Contents Revision Page ............................2 Table of Contents ..........................3 Introduction to the MCS-8 Heatpump / Chiller Controller ..............6 The MCS-8 Micro Controller:.....................6 The MCS-8 will control the following items: ................7 Control will be based upon the following: ..................7 Introduction to Control Modes and States....................8...
  • Page 4 Hot Gas Reheat..........................23 Modulating Reheat only in dehumidification states..............23 Electric Reheat ..........................23 Modulating Reheat in all states except HEATPUMP OFF or lock off states ......23 MCS-8 States for Heatpump / Chiller Faults ..................25 LOCKOUT FAULT........................25 SAFETY FAULT........................25 SENSOR FAULT........................25 ECONOMIZER STATES ........................26 BYPASSED-COOL ........................26...
  • Page 5 16 Details of MCS-8 Key Items ......................37 17 Details of MCS-SI8/16 Key Items .....................38 18 The MCS Sensors Quick Reference Sheet – Temperature, Supply Air, Humidity & Pressure transducers ..............................39 19 The MCS Sensors Quick Reference Sheet - Dry Contact Inputs ............40 20 The MCS Trouble Shooting Quick Reference Sheet .................41...

  • Page 6: Introduction To The Mcs-8 Heatpump / Chiller Controller

    3 Introduction to the MCS-8 Heatpump / Chiller Controller The MCS-8 Micro Controller: The MCS-8 micro controller is designed to be the primary controller for a heatpump / chiller package. The MCS-8 control algorithm provides the ultimate in control strategies by enabling: •...

  • Page 7: The Mcs-8 Will Control The Following Items

    The following is an example of a package using zone air for all decisions. The zone temperature and humidity input can be provided by MCS-STAT, communicating thermostat. For additional flexibility the MCS-STAT is now supported with this software. This enables communication via the MCS- STAT to be provided in the zone area.

  • Page 8: Introduction To Control Modes And States

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 4 Introduction to Control Modes and States CONTROL MODES The Control Mode dictates the general status of the unit and which Control States can be entered. There are four modes and each mode has a unique control sensor and set points that are associated with that mode.

  • Page 9: Heating Mode

    CONTROL STATES The MCS-8 controller is a state computer, that is, decisions are made based upon set points, timers and sensor inputs, the controller moves from one state to another. The controller will change states to ensure the proper functioning of the heatpump / chiller package.

  • Page 10: Control Status Display (From The Mcs-8 Keypad)

    ECONOMIZER CONTROL STATES, these states deal with the status of the economizer valve. Control states, on the MCS-8, are displayed on the 2x16 LCD by depressing the SERVICE DIAGNOSTICS entry key and then selecting the option CONTROL STATUS. (Depress the enter key.) The up and down arrow may then used to scroll between the information screens.
  • Page 11 Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0...

  • Page 12: Mcs-Stat Support

    This will provide the power and the RS485 communications. Two wires provide communications by connecting the MCS I/O connector to the MCS-STAT. Make sure that the + terminal on the MCS-8 is connected to the + on the MCS-STAT. The MCS-STAT requires 12 volts, this can be provided by connecting the other two wires to the +12 volt and ground terminals on the MCS-8 and the MCS-STAT.
  • Page 13 Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 EVAP OVRFLW2 An overflow on evaporator #2 has occurred. Refer to setpoint #31. DIG SAFETY A safety error condition has been indicated. Refer to setpoint #32. NO FLOW A no flow error condition has been indicated.

  • Page 14: Fan Switch

    If the system has no active alarms and the override button is pushed and the MCS-8 has the system off due to the schedule being false; the schedule will be overridden for the time specified in setpoint #20. The...

  • Page 15: Heatpump / Chiller Control States

    6 Heatpump / Chiller Control States: The MCS-8 control algorithm will move from one state to another based upon set points, timers and sensor inputs. The states and set points are defined in this document. The sophisticated control algorithm allows the controller to decide on the number of heating, cooling or dehumidification stages based on one sensor while FAN/PUMP ONLY stage can be controlled based on the same or a different sensor.

  • Page 16: Econo Cooling

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 6.2.1 ECONO COOLING This state is the economize mode and it will be entered if the controlling air temperature rises above the COOL TARGET set point and the water temperature is below the COOL’G WATER set point. The valve that directs the water flow will remain open in all cooling states as long as the water temperature is below the COOL’G WATER set point.

  • Page 17: Cool: 4 Comps

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 Once the controlling air temperature has been satisfied the COOL: 2 COMP state will be entered. If additional cooling is required the system will move to COOL: 4 COMP. The system will remain in the COOL: 3 COMP state for a minimum time as specified in the STEP DELAY set point.

  • Page 18: Heating' States - (Type Of Heat Is Reversing Valve)

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 HEATING’ states - (type of heat is REVERSING VALVE) When the type of heat utilizes the reversing valve, the system will stage the compressors to maintain the control temperature with in the control heat zone.

  • Page 19: Heat: 4 Comps (Type Of Heat Is Reversing Valve)

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 6.4.4 HEAT: 4 COMPS (type of heat is REVERSING VALVE) This state is the fourth and final stage of mechanical heating and it will be entered if an additional stage of heating is needed to keep the controlling air temperature within the control heat zone.

  • Page 20: Heating' States - (Type Of Heat Is Electric Heat)

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 HEATING’ states - (type of heat is ELECTRIC HEAT) If type of heating is electric, this is only one stage of heating. It is either on if heat is required or off.

  • Page 21: Dehum: 2 Comps

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 6.7.2 DEHUM: 2 COMPS This state is the second stage of mechanical dehumidification and it will be entered if an additional stage of dehumidification is needed to keep the controlling air humidity within the control dehumidification zone. In this state: •...
  • Page 22 Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 • Compressor four is turned on. If the system determines that this stage is no longer needed to keep the humidity within the control dehumidification zone, Compressor four will be turned off and the system will return to the DEHUM: 3 COMP state.

  • Page 23: Reheat Options

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 7 Reheat Options The system will support the following types of reheat. They are specified in the PC-Config program when the configuration file is built. None No reheat is available. Hot Gas Reheat If the system is in one of the dehumidification states, and the hot gas reheat option has been selected;...
  • Page 24 Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 Based upon the reheat control sensor as specified, the analog output will be modulated to open, temperature is below the zone, or close, temperature is above the zone, the valve to maintain the temperature within this zone.

  • Page 25: Mcs-8 States For Heatpump / Chiller Faults

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 8 MCS-8 States for Heatpump / Chiller Faults LOCKOUT FAULT This state is entered whenever a critical situation is encountered that could cause harm to the heat pump / chiller system. Items such as high or low pressure on any compressor, no airflow, high or low entering or leaving water, etc will force the system into this state.

  • Page 26: Economizer States

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 9 ECONOMIZER STATES The economizer states indicate the status of the economizer. The economizer can be active in various states. BYPASSED-COOL The economizer valve is off because the water temperature is above the value in set point COOL’G WATER.

  • Page 27: Set Points And Definitions

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 10 SET POINTS AND DEFINITIONS: Name Description **** SET POINTS USED TO CONTROL WHEN THE VARIOUS MODES CAN BE ENTERED FROM THE FAN/PUMP ONLY STATE. COOL ENABLE This set point contains an actual temperature value. Then the system is in the FAN/PUMP ONLY state, the system will enter the cooling mode if the controlling air temperature is greater than this value.
  • Page 28 **** TIMING SET POINTS. OverrideTime Time expressed in minutes that when the MCS-STAT over ride button is depressed that the system’s schedule will be active. STARTUP DLY Upon a computer reset or power return, the system will remain in the STARTUP DELAY state for this period of time.
  • Page 29 Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 Name Description EVAP OVRFLW2 If the evaporator overflow2 digital input is turned on the system locks off all relay output points except the alarm. DIGITAL SAFETY If the set point is set to ‘ACTIVE’ in the PC-Config program it will cause the system to test the digital input that indicates that a safety has occurred.
  • Page 30 Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 Name Description RETURN RESET This set point is used to calculate a reset to the COOL ENABLE set point. This set point contains a temperature value that represents the upper limit of the COOL ENABLE temperature range.
  • Page 31 Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 Name Description REHT MINadj This set point is required if the modulating reheat option has been selected. This set point contains the minimum adjustment that can be made to the reheat valve at one time.

  • Page 32: Return Air Target Reset Logic

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 11 Return Air Target Reset Logic #42 RETURN RESET 70.0F – Temperature at which target reset starts #43 RETURN DIFF 10.0F – Temperature offset from starting return temperature #44 MAX RESET 10.0F –...

  • Page 33: Authorization Function

    12 AUTHORIZATION FUNCTION The authorization code is a special four-character code that enables access in to the MCS-8 system. The code must be numeric, with values between 1 and 8, if it is to be entered from the Keypad/Display. If the system is being accessed via PC-Connection program, the code may consist of any valid alpha/numeric characters.

  • Page 34: The Micro Control Center Keypad Display Quick Reference

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 13 The Micro Control Center Keypad Display Quick Reference • No authorization is required in the DISPLAY STATUS section for • ADDITIONAL STATUS information shows names, total, run hours viewing information.

  • Page 35: The Micro Control Center Keypad Display Quick Reference-Entry Keys

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 14 The Micro Control Center Keypad Display Quick Reference- ENTRY KEYS • The ENTRY keys (SERVICE, SETPOINT, MANUAL and • Different items will appear depending on the package PROGRAM) provide menu items, some of which when selected will configuration and options selected.

  • Page 36: The Micro Control Center Mcs-8 Quick Reference Sheet

    Revision 4.0 15 The Micro Control Center MCS-8 Quick Reference Sheet Wiring Guide Notes • Relay Outputs (RO) 120 VAC 10 amps on the MCS-8. • SI factory settings for analog inputs. (0 to 5 volts dc) • All analog inputs must have shield tied to GND.

  • Page 37: Details Of Mcs-8 Key Items

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 16 Details of MCS-8 Key Items 8 Relay Outputs (RO) Optional UPS 120 VAC 50/60 hertz Input Common Normally Normally 8 VDC Ground 16 VDC Line Neutral Ground Open Closed 120 VAC...

  • Page 38: Details Of Mcs-Si8/16 Key Items

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 17 Details of MCS-SI8/16 Key Items Sensor Input 1-8 +5VDC Ground Signal SI #1 SI #2 SI #3 SI #4 SI #5 SI #6 SI #7 SI #8 120/24VAC 315ma/2a Digital...

  • Page 39: The Mcs Sensors Quick Reference Sheet - Temperature, Supply Air, Humidity & Pressure Transducers

    (SI Revision 1.5 & Higher) MCS-SAIR (SI Revision 1.5 & Higher) Connects to 1 of MCS Sensor Inputs 1 through 8/16 Connects to 1 of MCS Sensor Inputs 1 through 8/16 Shielded cable GND drain must be connected to SI ‘GND’...

  • Page 40: The Mcs Sensors Quick Reference Sheet - Dry Contact Inputs

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 19 The MCS Sensors Quick Reference Sheet - Dry Contact Inputs Dry Contact’s (SI 1 through 8 Revision 1.5 & Higher) Digital inputs for use on sensor inputs (SI 1-8/16) Wire between +5 & SI...

  • Page 41: The Mcs Trouble Shooting Quick Reference Sheet

    Lost I/O 8) Indicates communications problem. a) Verify RS485 LED blinking. b) Verify termination jumper J6 only on at MCS-8 & last I/O. c) Verify MCS-8 & I/O address’s set correctly. d) Verify wiring from MCS-8 to each I/O correct.
  • Page 42 Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 PROBLEM POTENTIAL SOLUTION SI from AMPS board 10 A low. 12) This indicates a problem with this SI only. a) Jumper setting on this SI in wrong position. INVALID CONFIG VER 13) Indicates layout of CFG wrong.

  • Page 43: Summary Of Control States

    Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 21 Summary of Control States The following table contains HEAT PUMP / CHILLER CONTROL STATES. The HEAT PUMP control states can be viewed form the keypad by depressing the SERVICE DIAGNOSTICS key and selecting the CONTROL STATUS function.
  • Page 44 Heatpump Water-Air/Water-Water Heatpump/Chillers MCS-8 Version 7 Manual Revision 4.0 The following table contains ECONOMIZER CONTROL STATES. NAME DESCRIPTION BYPASSED-COOL Economizer valve is off because the water temperature is not cold enough to provide cooling. BYPASSED-HEAT Economizer valve is off because the water temperature is not hot enough to provide heating.

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