Multiaqua MHRC2 User manual

Multiaqua, Inc.
306 Hagood Street, Easley, South Carolina 29640 • Phone: [phone] Fax: [phone]
with MCS MAGNUM Controls
MHRC2CHILLER
OPERATION MANUAL
MHRC2
Rev.62016NRC

Our commitment to creating innovative air conditioning products has made us one of the most
respected organizations in the industry. From concept to market, Multiaqua takes a hands-on approach
to ensure that each and every step meets our stringent standards of quality, durability and dependability.
All Multiaqua products are designed with the future in mind. That’s why all air conditioning chiller
products are flexible, which makes it easy to adapt to virtually all kinds of building applications.
Multiaqua, Inc.
306 Hagood Street, Easley, South Carolina 29640
Phone: [phone] Fax: [phone]
http://www.multiaqua.com
All information contained within this document is considered to be proprietary information of Multiaqua and
MCS System Controls. No information or data from this document shall be published, used, reproduced,
transmitted, or disclosed to others outside your organization without the prior expressed written consent
of Multiaqua, Inc. This document and the information contained herein shall be treated as proprietary.
Reasonable provisions shall be provided to ensure that this information remains proprietary by your employees,
agents, and other personnel that may have access to this document. Copyright ©2015
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1. Table of Contents
1. Table of Contents .................................................................................................................................................3
2. Introduction to Multiaqua and MCS-Magnum ...................................................................................................5
2.1. About the Multiaqua Heat reclaim chiller (MHRC)........................................................................................5
2.2. About the MCS-MAGNUM............................................................................................................................5
2.3. About PC Support Software for MCS-MAGNUM..........................................................................................5
2.4. Requirements for PC Software
3.1. MHRC OPERATIONAL.................................................................................................................................7
3.2. MHRC UNIT STATUS – POWER UP...........................................................................................................7
4. Status Displays ....................................................................................................................................................8
4.1. PRESS MENU – SELECT STATUS ............................................................................................................8
4.2. UNIT COMPRESSOR LOADED ..................................................................................................................8
4.3. COMPRESSOR 1 STATUS- RUNNING......................................................................................................8
4.4. COMPRESSOR 1 STATUS- RUNNING.......................................................................................................9
4.5. EXV VALVE OPENING.................................................................................................................................9
5. Status Outputs ...................................................................................................................................................10
5.1. MAIN MENU - SELECT OUTPUTS STATUS.............................................................................................10
5.2. UNIT RELAYS STATUS..............................................................................................................................10
5.3. RELAYANALOG STATUS..........................................................................................................................10
6. Status Inputs ......................................................................................................................................................11
6.1. PRESS MENU - SELECT INPUTS ............................................................................................................11
6.2. INPUTS (SENSOR STATUS).....................................................................................................................11
6.3. INPUT VALUE FOR M1 SENSOR..............................................................................................................11
6.4. CHANGE VALUE REQUIRES HIGH AUTHORIZATION............................................................................11
7. Alarms .................................................................................................................................................................12
7.1. PRESS MENU - SELECTALARMS...........................................................................................................12
7.2. ALARMS.....................................................................................................................................................12
8. Graphs ................................................................................................................................................................13
8.1. PRESS MENU - SELECT GRAPHS ..........................................................................................................13
8.2. GRAPH 1ST SENSOR INPUT...................................................................................................................13
8.3. GRAPH SAMPLE RATE.............................................................................................................................13
8.4. GRAPH EDIT SAMPLE RATE....................................................................................................................13
9. Set Points ...........................................................................................................................................................14
9.1. PRESS MENU - SELECT SET POINTS ....................................................................................................14
9.2. DISPLAY SET POINTS ..............................................................................................................................14
9.3. EDIT SETPOINT.........................................................................................................................................14
9.4. HIGHER AUTH NEEDED...........................................................................................................................14
10. Service Tools ......................................................................................................................................................15
10.1. PRESS MENU - SELECT SERV TOOLS...................................................................................................15
10.2. SERV TOOLS OPTIONS............................................................................................................................15
10.3. SYSTEM INFO OPTION ............................................................................................................................15
10.4. SYSTEM INFO SCREEN 1........................................................................................................................15
10.5. SYSTEM INFO SCREEN 2........................................................................................................................16
10.6. SYSTEM INFO SCREEN 3........................................................................................................................16
10.7. SYSTEM INFO SCREEN 4........................................................................................................................16
10.8. SYSTEM INFO SCREEN 5........................................................................................................................16
11. Lockout Reset Alarms .......................................................................................................................................17
11.1. PRESS MENU - SELECT LCKOUT RST...................................................................................................17
11.2. NO CURRENT LOCKOUTS.......................................................................................................................17
12. Lockout Alarms ..................................................................................................................................................18
12.1. PRESS MENU - SELECT LCKOUTALARM..............................................................................................18
12.2. 1ST LCKOUT ALARM DISPLAYED ...........................................................................................................18
13. Passwords ..........................................................................................................................................................19
13.1. PRESS MENU - SELECT PASSWORDS...................................................................................................19
13.2. ENTER PASSWORD..................................................................................................................................19
.....................................................................................................................5
2.5. MCS- MAGNUM KEYPAD - Keys and their functions..................................................................................6
3. MHRC Start Up Screens ......................................................................................................................................7

13.3. ENTER TO GET AUTHORIZED.................................................................................................................19
13.4. PASSWORD ACCEPTED ..........................................................................................................................19
14. Main Menu Functin Keys ...................................................................................................................................20
14.1. MAIN MENU...............................................................................................................................................20
14.2. HELP DISPLAY ..........................................................................................................................................20
14.3. MHRC LARGE TYPE DISPLAY .................................................................................................................20
14.4. LARGE TYPE DISPLAY.............................................................................................................................20
15. MHRC MODES ....................................................................................................................................................21
15.1. UNIT IN POWER UP..................................................................................................................................21
15.2. NO RUN- I/O LOSS...................................................................................................................................21
15.3. UNIT IN LOCKOUT ....................................................................................................................................21
15.4. UNIT IS OFF ...........................................................................................................................................21
15.5. UNIT IS HOLDING .....................................................................................................................................21
15.6. UNIT UNLOADING....................................................................................................................................21
15.7. UNIT IS LOADING......................................................................................................................................22
15.8. RUN/STOP SW OFF..................................................................................................................................22
15.9. SCHEDULED OFF.....................................................................................................................................22
15.10. OFF-NO FLOW ..........................................................................................................................................22
15.11. UNIT IS UNLOADED..................................................................................................................................22
15.12. UNIT IS LOADED.......................................................................................................................................22
15.13. SWITCHING MODES.................................................................................................................................22
16. MHRC Sequence of Operation ..........................................................................................................................23
17. MCS-MAGNUM EXV Suction/Discharge Superheat Logic .............................................................................25
17.1.1. EXV Related Set points. ....................................................................................................
20. MHRC MAGNUM Set Points ..............................................................................................................................31
21. MHRC MAGNUM Alarms and Safeties .............................................................................................................35
21.1 Introduction..................................................................................................................................................35
21.2 Information only alarms .............................................................................................................................35
21.2.1 System generated alarms .................................................................................................................... .....35
21.2.2 Alarms as a result of user actions.............................................................................................................35
21.2.3 Alarms generated by the control algorithm...............................................................................................36
21.3 MHRC MAGNUM system alarms ...............................................................................................................36
21.3.1 Alarms are generated by the MHRC MAGNUM control algorithm:............................................................36
21.3.1.1 Configuration problem alarms .......................................................................................................36
21.4MHRC Unit Safeties ....................................................................................................................................37
21.4.1 Introduction.....................................................................................................................................................37
21.4.2 Unit Safeties ...................................................................................................................................................37
21.5 MHRC Compressor Safeties ......................................................................................................................38
21.5.1 Introduction..........................................................................................................................................38
21.5.2 Compressor safeties..................................................................................................................................38
21.6 Condenser Fan safeties ..............................................................................................................................39
21.7 Heating Stages Safeties ..............................................................................................................................40
21.8 EVAPORATORSAFETIES..............................................................................................................................40
22. APPENDIX A - MAGNUM No Run Capacity Run States ..................................................................................41
23. APPENDIX B -MHRCRefrigerant Circuit Layout..................................................................................................42
24. APPENDIX C - Controls Layout.............................................................................................................................43
25. APPENDIX D - Wiring Diagram.................................. ...........................................................................................45
26. APPENDIX E - MHRC2 Frequency Drive Drawings..............................................................................................46
27. APPENDIX F - Configuration .................................................................................................................................49
28. APPENDIX G - MCS Trouble Shooting Reference ...............................................................................................64
21.3.1.2 MCS I/O network problem alarms ................................................................................................36
21.3.1.3 Sensors fault alarms.......................................................................................................................36
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17.1.2. EXV Control States...............................................................................................................28
18. MAGNUM Condenser Control Strategy ..........................................................................................................29
19. MCS-CONNECT CONTROL STATUS DISPLAY ...............................................................................................30

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t, add-on, and process hydronic applications.
2.2. About the MCS-MAGNUM
2.3. About PC Support Software for MCS-MAGNUM
MCS-CONNECT program provides both local and remote communications to the MCS-MAGNUM. Through
this program the status of the controller can be viewed and with proper authorization changes can be made
to the system. Configuration files can be transmitted to or received from an MCS-MAGNUM unit. The MCS-
MAGNUM automatically performs history logging; this program will graph selected items. This program is
written in the Java programming language. Ageneral user’s manual is available with this software package.
This program runs under Windows 7 or greater and makes use of the Microsoft Windows Help function to as-
sist the user.
2.4. Requirements for PC Software
Minimum System Required to Run Program
• PC with a Pentium2-class processor • 14.4k baud modem or higher for remote
communications • 1280 x 800 pixel or higher display
• Windows 7 or later operating system or • Minimum 1GB of RAM
Linux operating system • Minimum 4GB Drive
• Ethernet 10/100/1000 • USB Port 2.0 or higher
2. Introduction to Multiaqua and MCS-Magnum
A multi heat source/sink capable refrigerant management system designed to satisfy the Heating & Cooling
requirements of the global residential and commercial markets including, but not limited to, new construction,
retrofi
2.1. About the Multiaqua Heat reclaim chiller (MHRC)
The MHRC is currently available in 5 ton nominal size and scalable to 100 tons in air cooled configuration .
Variable speed and Variable capacity Digital scroll compressors allow the system to modulate its capacity to
match the Heating and or Cooling requirements. The MHRC is a self-contained machine with no add-on mod-
ule requirements or additional assembly needed to simultaneously heat and cool water (SHC) or indepen-
dently make hot or cold water. The Multiaqua MHRC is designed with great care to provide easy servicing by
incorporating readily available components and diagnostics.
The MCS-MAGNUM is a rugged microprocessor based controller that is designed for the hostile environment
of the HVAC industry. It is designed to provide primary control, no mechanical controls; interface with building
management systems; communicate both locally and remotely. The MCS-MAGNUM provides flexibility with
setpoints and control options that can be selected prior to commissioning a system or when the unit is live
and functioning. Displays, alarms and other interfaces are accomplished in a clear and simple language that
informs the user as to the status of the controller.
The MCS-MAGNUM is designed to safeguard the system that is being controlled, eliminate the need for
manual intervention and to provide a simple but meaningful man-machine-interface.
This family of equipment can be combined with groundwater or earth loops for enhanced effi
ciency operation.
It can also be combined with solar thermal or natural gas for low cost and extreme cold weather
applications. Low starting amperage makes the MHRC2 particularly compatible with solar/battery power
systems.

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MENU KEY
LCD DISPLAY
FUNCTION KEYS
F1, F2, F3
ENTER KEY
ARROW KEYS
2.5. MCS- MAGNUM KEYPAD - Keys and their functions
• LCD DISPLAY - displays current condition of controller. Pressing the Menu key, displays the 10 available
Menu items.
• FUNCTION KEYS - F1, F2, F3 are used to Page Up and Page Down as shown
below, F2 - PG(page up), F3 - PG(page down). Function keys are also used when a numerical digit is
needed, F1 = 1, F2 = 2, F3 = 3.
• ARROW KEYS -  used to move between items on screen and also as numerical digits when
needed.
• ENTER KEY - used to accept highlighed item on screen and to move to next screen.
• MENU KEY - used to move to main menu, also used as numerical digit 8.

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MULTIAQUALOGO SCREEN
THIS DISPLAYAPPEARS FORAFEW SECONDS
IT ISYOUR INDICATION THAT THE MAGNUM IS
OPERATIONAL
HH:MM C TNK / H TNK
CURRENT MHRC STATUS – POWER UP DELAY
UNIT IN POWER UP, TIME INTHIS STATE BASED ON SETPOINT #23
TEMP& FLOWTARGETSWITHCURRENTVALUESDISPLAYED
PRESSF3PAGEDOWN
3. MHRC Start Up Screens
(MCS-MAGNUM controller sensors are in manual mode for purpose of display)
The MCS-MAGNUM controller is a state computer, that is, decisions are made based upon setpoints, timers and
sensor inputs, the controller moves from one state to another. The controller will change states to ensure the
proper functioning of the MHRC package.
As we review the various states, we must remember the MHRC package consists of a number of different parts:
the compressors, evaporators and condensers plus the mode of operation.
The following sequence occurs at Power Up:
3.1. MHRC OPERATIONAL
3.2. MHRC UNIT STATUS – POWER UP
C TNK = COLD TANK TEMPERATURE
H TNK = HOT TANK TEMPERATURE

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HH:MM MAIN MENU
MENUKEY, SELECT STATUS,PRESS() ENTERKEY
THIS WILLALLOWUSER TO DISPLAYDETAILS
OFTHE UNIT STATUS
PRESS F3 PG TO CONTINUE REVIEWING STATUS
HH:MM C TNK / H TNK
CURRENT MHRC STATUS – UNIT IS LOADED
TIME IN COOLMODE
SHOWS WANTED,ACTUAL, % LOADED, DELAY
AND RATE OF CHANGE
PRESS F3 PG TO CONTINUE REVIEWING STATUS
HH:MM C TNK / H TNK
COMPRESSOR 1 IS RUNNING
TIME IN THIS MODE
PROVIDES SUCTION, DISCHARGE & OILPSI WITH MOTOR %
AS WELLAS TEMPERATURES
PRESS F3 PG TO CONTINUE REVIEWING STATUS
4. Status Displays
The current status can be viewed on the LCD display by depressing the ‘Menu’ key and selecting STATUS, then
depressing the ‘ENTER KEY’. Or it can be accessed via the MCS-CONNECT program under status screen
section (See MCS-CONNECT Manual for further details).
4.1. PRESS MENU – SELECT STATUS
4.2. UNIT COMPRESSOR LOADED
4.3. COMPRESSOR 1 STATUS- RUNNING

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HH:MM CMP 1 STATUS C TNK / H TNK
COMPRESSOR IS RUNNING
PROVIDES SATURATED SUCTION, SUCTION SUPERHEAT,
SATURATED CONDENSING & DISCHARGE SUPERHEAT
PRESS F3 PG TO CONTINUE REVIEWING STATUS
HH:MM EXV 1 STATUS C TNK / H TNK
OPENING EXV 1
TIME IN THIS MODE
PROVIDES VALVE %, TIMETO NEXT CHANGE, SUPERHEAT & RATE OF
CHANGE, PROVICES CONTROL& TARGET
PRESS F3 PG TO CONTINUE REVIEWING STATUS
4.4. COMPRESSOR 1 STATUS- RUNNING
4.5. EXV VALVE OPENING

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HH:MM MENU, SELECT OUTPUTS
THIS WILLALLOW THE USER TO DISPLAY DETAILS
OF THE OUTPUTS STATUS
BOTHANALOG & DIGITAL
PRESS (ENTER KEY) TO SELECT
HH:MM OUTPUTS (RELAY &ANALOG)
THE 1ST FOUR RELAY OUTPUTSARE PRESENTED
KEYSALLOW THE USER TO SCROLL THROUGH THE DATA
FUNCTION KEY F1ALLOWS THE USER TO DISPLAYANALOG OUTPUTS
PAGE UP / DOWN DISPLAYS NEXT 4 OUTPUTS
HH:MM PRESSING F1 SELECTSANALOG OUTPUTS
THE SCREEN SHOWS 3ANALOG OUPUTS IN THIS UNIT
KEYSALLOW THE USER TO SCROLL THROUGH THE DATA
FUNCTION KEY F1ALLOWS THE USER TO DISPLAYANALOG OUTPUTS
PAGE UP / DOWN DISPLAYS NEXT OUTPUTS
5. Status Outputs
5.1. MAIN MENU - SELECT OUTPUTS STATUS
5.2. UNIT RELAYS STATUS
5.3. RELAY ANALOG STATUS

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HH:MM MENU KEY, SELECT INPUTS
PRESS ENTER
THIS WILLALLOW USER TO DISPLAY DETAILS
OF THE INPUTS
BOTHANALOG & DIGITAL
HH:MM INPUTS (ANALOG & DIGITAL)
THE FIRST FOUR INPUTSARE PRESENTED
KEYSALLOW THE USER TO SCROLL THROUGH THE DATA
FUNCTION KEY F1ALLOWS THE USER TO DISPLAYANALOG OUTPUTS
PAGE UP / DOWN DISPLAYS NEXT 4 OUTPUTS
HH:MM INPUT SHOW CURRENT VALUE
PRESS ENTER TO CHANGE VALUE
6. Status Inputs
6.1. PRESS MENU - SELECT INPUTS
6.2. INPUTS (SENSOR STATUS)
6.3. INPUT VALUE FOR M1 SENSOR
6.4. CHANGE VALUE REQUIRES HIGH AUTHORIZATION
HH:MM NEXT SCREEN SHOWS HIGHERAUTH NEEDED
TO CHANGE VALUE
PRESS ENTER TO RETURN TO INPUTS

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HH:MM MENU KEY, SELECTALARMS
ENTER
THIS WILLALLOW USER TO DISPLAY DETAILS OF THEALARMS
THEREAREAMAXIMUM OF 100 ALARMS
PRESENTED TWO TOA SCREEN WITH MOST CURRENT FIRST
HH:MM ALARMS
THE FIRSTTWOALARMSARE PRESENTED
 ALLOWS THE USER TO SCROLL THROUGH THEALARMS
PAGE UP / DOWN DISPLAYS NEXTALARMS
7. Alarms
7.1. PRESS MENU - SELECT ALARMS
7.2. ALARMS

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HH:MM MENU KEY, SELECT GRAPHS, PRESS ()ENTER
THIS WILLALLOW USER TO DISPLAY DETAILS OFA GRAPH
ONE ITEM IS GRAPHEDATATIME
IT WILLBE PLOTTED IN REALTIME
HH:MM GRAPHS
THE 1ST SENSOR INPUTIS GRAPHED
↑↓KEYS LETS THE USER SCROLLTHRU THE DATA
USING THE FUNCTION KEYS
SELECT EDIT, RELAY OUTPUTS ORANALOG INPUT
HH:MM GRAPHS
PRESSING F1 “EDIT’BRINGS UP THIS DISPLAY
WITH CURRENT VALUE HIGHLIGHTED
PRESS THE ENTER KEY
USING  ADJUSTTHE SAMPLE RATE
8. Graphs
8.1. PRESS MENU - SELECT GRAPHS
8.2. GRAPH 1ST SENSOR INPUT
8.3. GRAPH SAMPLE RATE
8.4. GRAPH EDIT SAMPLE RATE
HH:MM GRAPHS
ONCE THE SAMPLE RATE IS CORRECT
PRESS THE ENTER KEY
NOTE YOU MUST BE AUTHORIZED TO MAKE THE CHANGE

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HH:MM MENU KEY, SELECT SETPOINTS
PRESS ENTER KEY
THIS WILLALLOW THE USER TO DISPLAY DETAILS OF SETPOINTS
SETPOINTS CAN BE DISPLAYED
BASED ONAUTHORIZATION LEVEL
HH:MM THE 1ST FOUR SETPOINTSARE DISPLAYED
KEYSALLOW THE USER TO SCROLL THROUGH THE DATA
FUNCTION KEY F1 ALLOWS THE USER TO DISPLAY SETPOINT DATA
PRESS ENTER KEYTO SEE VALUE OF SETPOINT 1
9. Set Points
9.1. PRESS MENU - SELECT SET POINTS
9.2. DISPLAY SET POINTS
9.3. EDIT SETPOINT
9.4. HIGHER AUTH NEEDED
HH:MM SETPOINT 1 VALUE SHOWN
SETPOINTS VALUES CAN BE CHANGED
BASED ONAUTHORIZATION LEVEL
PRESS ENTER KEYTO CHANGE VALUE
HH:MM SCREEN SHOWS
HIGHERAUTHORIZATION LEVEL REQUIRED
TO CHANGE SETPOINT’S VALUE

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10. Service Tools
HH:MM MENU KEY, SELECT SERVTOOLS, PRESS ()ENTER
THIS WILLALLOW USER TO DISPLAY
DETAILS OF SERV TOOLS
HH:MM SERV TOOLS
THE SERVTOOLOPTIONS ARE DISPLAYED
↑↓KEYSALLOW THE USER TO SCROLL
THROUGH THE OPTIONS
FUNCTION KEYSALLOW PAGE UP/DOWN
PRESS PG DOWN SELECT SYSTEM INFO
HH:MM SELECT SYSTEM INFO - ETHERNETNETWORK
PRESS ()ENTER TO SELECT
FUNCTION KEYSALLOW PAGE UP/DOWN
HH:MM SYSTEM INFO
SCREEN SHOWS ETHERNET SETUP
DYNAMIC IP
& IPADDRESS SETTING
PRESS PG DOWN CONTINUES NEXT SERV TOOLS
10.1. PRESS MENU - SELECT SERV TOOLS
10.2. SERV TOOLS OPTIONS
10.3. SYSTEM INFO OPTION
10.4. SYSTEM INFO SCREEN 1

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HH:MM SERV TOOLS
SYSTEM INFO
PRESSENTER KEYTO SELECT
HH:MM SYSTEM INFO
SHOWS FIRMWARE VERSION
& CONFIG NAME
PG CONTINUES TO NEXT SYSTEM INFO
HH:MM SYSTEM INFO
SHOWS COMPANY NAME
& TYPE OF UNITBEING CONTROLLED
PG CONTINUES TO NEXT SYSTEM INFO
HH:MM SYSTEM INFO
SHOWS CONFIG VERSION NUMBER
& CONFIG DATE
PG CONTINUES TO NEXT SYSTEM INFO
10.5. SYSTEM INFO SCREEN 2
10.6. SYSTEM INFO SCREEN 3
10.7. SYSTEM INFO SCREEN 4
10.8. SYSTEM INFO SCREEN 5

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HH:MM MENU KEY, SELECT LCKOUT RST
ENTER KEY
THIS WILLALLOW USED TO
DISPLAYANY LOCKOUTS
HH:MM IF NO LOCKOUTS EXISTYOU WILLBE NOTIFIED
IF THE UNITIS IN LOCKOUTYOU WILL BEALLOWED TO RESET.
YOUARE LIMTED TO 10 RESETSADAY
MAKE SURE THE CAUSE OFTHE RESET IS FIXED
BEFORE TRYINGAGAIN
11. Lockout Reset Alarms
11.1. PRESS MENU - SELECT LCKOUT RST
11.2. NO CURRENT LOCKOUTS

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HH:MM SYSTEM INFO LOCKOUTALARM
NO LOCKOUTALARMS
HH:MM
MENUKEY, SELECTLCKOUTALARMS, PRESS ()ENTER
THIS WILLALLOW USER TO
DISPLAYANY LOCKOUTS ALARMS
12. Lockout Alarms
12.1. PRESS MENU - SELECT LCKOUT ALARM
12.2. 1ST LCKOUT ALARM DISPLAYED

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HH:MM
MENU KEY, SELECT PASSWORD, PRESS ()ENTER
THIS WILLALLOW USER TO GETAUTHORIZED
HH:MM ENTER YOUR 4 DIGIT PASSWORD
MUST BE NUMBERS BETWEEN 1 & 8TO ENTER
FROM KEYPAD
CAN BEANY COMBINATION FROM LAPTOP
HH:MM
AS EACH DIGIT IS ENTEREDAN (*)ASTERICK SHOWS
UP ON DISPLAY
WHEN COMPLETED PRESS ENTER ()
HH:MM IFACORRECT PASSWORD IS ENTERED
YOU WILL BE NOTIFIED AT WHAT
LEVELYOUAREAUTHORIZED
13. Passwords
13.1. PRESS MENU - SELECT PASSWORDS
13.2. ENTER PASSWORD
13.3. ENTER TO GET AUTHORIZED
13.4. PASSWORD ACCEPTED

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HH:MM
PRESS MENU KEY
F1 KEY FOR HELP
PRESS ENTER
HH:MM
DESCRIPTION OF THE SYMBOLS USED
TO MOVE CURSOR
& KEYS USED TO ENTER PASSWORD
HH:MM
PRESS F3 KEYAT MAIN MENU
14. Main Menu Functin Keys
14.1. MAIN MENU
14.2. HELP DISPLAY
14.3. MHRC LARGE TYPE DISPLAY
14.4. LARGE TYPE DISPLAY
HH:MM
DISPLAY SHOWS LARGE TYPE
OF STATUS WINDOW