Ice Rink (Single and Dual Configurations) Custom Control Features

& M&M Refrigeration, Inc. Computer Control System Ice Rink (Single and Dual Configurations) Custom Control Features REVISION DATE DESCRIPTION - 4/20/05 Original release. A 09/21/98 Update Chiller Pump Control B 10/30/98 Sequencer Update 1998 M&M Refrigeration, Inc. All rights reserved. Printed in the United States of America. This manual is Copyright 1998 by M&M Refrigeration, Inc. The information presented herein is proprietary to M&M Refrigeration, Inc. No part may be reproduced or translated, in any form or by any means, without the expressed written permission of M&M Refrigeration, Inc.

Table of Contents OPERATIONAL OVERVIEW...1 Associated Documents...1 Equipment Control Summary...1 Sub Floor Warming System (Option)...1 Exhaust Fan Control (Option)...2 Snow Melt Pump Control (Option)...2 kw Monitoring (Option)...2 Lighting Control (Option)...3 Sequencer Control Enhancements...3 Control Parameter Selection...3 Floor Temperature Control...3 Control Setpoints...4 Condenser Control Enhancements...4 Condenser Stage Selection...4 Auxiliary Contacts...4 Condenser Heater (Option)...4 Condenser Sump Level (Option)...5 Non-Condensables (Option)...5 Compressor Control Enhancements...5 Compressor Modes...5 Compressor Stage Control...5 Compressor Stage Configuration...5 Compressor Control Overview...6 Compressor Jacket Cooling Pump...6 Chiller Control...6 Chiller Overview...7 Chiller Pump Control...7 Brine Return Temperature Control...7 Floor Temperature Control...8 Flow Switch Monitoring...8 Chiller Level Control (Option)...8 HPR Level Monitoring (Option)...8 M&M Refrigeration i

Emergency Stop...8 Operator Interface...9 Status Screens...9 Main Status Screen...9 Sequencer Status...10 Compressor Status...11 Compressor Runtime Status...12 Condenser Status...13 Chiller Status...14 Miscellaneous Status...15 Lighting Status...16 EQUIP Hot Key...16 Sub Floor Warming...17 Exhaust Fan...18 Snow Melt Pump...19 KWH Setpoints...20 Set KWH Totals...21 Lighting Control...22 SEQ Hot Key...23 Sequencer Control Setpoints...23 Sequencer Control Group Select...24 COND Hot Key...25 COMP Hot Key...25 Compressor Staging Configuration...25 CHLR Hot Key...26 Pump Control...26 Pump Selection...28 Pump Lead List...29 Miscellaneous Setup...30 LOGS Hot Key...30 MENUS Hot Key...30 M&M Refrigeration ii

OPERATIONAL OVERVIEW This document describes the custom control features implemented for the single and dual ice rink refrigeration control systems. The primary application is ice rink temperature control. Special options for lighting control and other safety features have also been implemented. Detailed documentation for the standard M&M Refrigeration control features may be found in the associated documents listed below. The control descriptions found in this document are intended to highlight the differences from the standard control features and to fully document the custom control features. Associated Documents CCS General Operating Overview CCS Sequencer Control Overview CCS Condenser Control Overview CCS Compressor Control Overview CCS Logs Function Overview CCS Additional Menus Overview Equipment Control Summary The ice rink software is designed to support a series of standard functions along with a variety of options. The following sections will discuss the equipment control by the software and identify which features are options. Sub Floor Warming System (Option) An option exist to control a sub slab warming systems using a sub slab temperature to control a pump. In the single rink system only one sub floor warming pump will exist. In the dual rink system two separate sub floor warming pumps will exist, one for each rink. The sub floor warming system pump is controlled either in MAN STOP, MAN START, or AUTOMATIC modes. In MAN STOP mode, the pump will remain stopped until the mode is changed. In MAN START mode, the pump will run until the mode is changed or the pump fails. In AUTOMATIC mode, the control is performed using a pump cut-in and pump cut-out setpoint. The pump is started when the temperature drops below the cut-in setpoint and stopped when the temperature rises above the cut-out setpoint. In any mode, if the auxiliary contact does not match the pump state an alarm will be generated and the pump will be failed. M&M Refrigeration

Exhaust Fan Control (Option) An option exist to control the engine room exhaust fan based on engine room temperature and refrigerant leak detection. The control of this feature will be the same in both the single rink and dual rink systems. The exhaust fan is controlled either in MAN STOP, MAN START, or AUTOMATIC modes. In MAN STOP mode, the fan will remain stopped until the mode is changed. In MAN START mode, the fan will run until the mode is changed. In AUTOMATIC mode, the control is performed using a fan on and a fan off temperature setpoint. When the engine room temperature is above the fan on setpoint the fan is started. When the engine room temperature is below the fan-off temperature the fan will be stopped. The fan will also be started whenever the refrigerant leak detector alarm is active when the fan is in AUTOMATIC mode. Snow Melt Pump Control (Option) An option exist to control a snow melt pump based on whether any of the compressors are running or not. The control of this feature will be the same in both the single rink and dual rink systems. The pump is controlled either in MAN STOP, MAN START, or AUTOMATIC modes. In MAN STOP mode, the pump will remain stopped until the mode is changed. In MAN START mode, the pump will run until the mode is changed or the pump fails. In AUTOMATIC mode, the pump will run whenever any compressor is running. In any mode, if the pump auxiliary contact does not match the pump state an alarm will be generated and the pump will be failed. kw Monitoring (Option) An option exist to monitor a kwh pulse input to determine energy usage. This feature will function the same on both the single rink and dual rink systems. The kwh pulse contact input is totaled and kwh per hour, day, week, month, and year is displayed and logged on a daily basis. The kwh value for each pulse is user-programmable but may not exceed 1.999 kwh per pulse. The present kw and demand kw are computed, displayed, and logged in the normal system logs. The maximum daily demand kw is displayed along with the time of day the maximum occurred. A demand kw high alarm is generated if the demand kw exceeds a user-programmable high kw setpoint. Note : The maximum kwh pulse rate shall not exceed 20 pulses per second with a minimum pulse width of 20 milliseconds. The kwh pulse type is assumed to be the square type but may be changed to an impulse type at the factory prior to initial delivery of the system. The default demand window is 15 minutes but may also be changed at the factory to 30 or 60 prior to initial delivery of the system. M&M Refrigeration 2

Lighting Control (Option) An option exist to performing scheduling for a series of lighting control outputs. In the single rink system only three lighting outputs will exist. In the dual rink system a separate set of three light outputs will exist, one set for each rink. The light outputs are actually lighting levels. The operator has the ability to manually select a lighting level or schedule them for each rink. Three daily schedules are provided for each rink, each with 8 event times and light levels. A weekly schedule for each rink allows for different daily schedules to be selected based on the day of the week. The operator also has the ability to override the current lighting level for each rink. Additionally, scheduled events will override any selected light level. Level 1 will turn on the first output. Level 2 will turn on outputs 1 and 2. Level 3 will turn on all 3 outputs. Sequencer Control Enhancements The CCS sequencer control has been enhanced to meet the needs of the single and dual ice rink systems. In the single rink system the sequencer will control two recip compressors. In the dual rink system the sequencer will control three recip compressors. The following features were added for both types of rink systems. A detailed overview of the standard CCS sequencer control is covered in the attached document CCS Sequencer Control Overview. Control Parameter Selection The sequencer control allows the user to select which control parameter the system will use to control the compressors. The units can be sequenced based on brine return temperature or floor temperature. In a single rink system only one floor rink temperature sensor is present so the sequencer simply switches between brine return and floor temperature. However, in a dual rink system two separate rink temperature sensors exist, one for each rink. In both the single and dual rink systems separate sets of setpoints will be supplied for brine return temperature and the rink floor temperature(s). Floor Temperature Control During floor temperature control mode the sequencer will control the starting and stopping of compressors to maintain the required floor temperature setpoint. In the single rink configuration the currently scheduled floor temperature setpoint will be passed to the sequencer for appropriate compressor control. In the dual rink configuration two separate floor temperature setpoints will exist, one for each rink. The CCS will determine which setpoint and temperature is the worst case of the two rinks and pass that value to the sequencer for compressor control. In dual rink configuration the chiller pumps will also be used to help modulate the rink floor temperatures since the sequencer is controlling the compressors off of the worst case temperature setpoint value. Chiller control will be covered in a later section. M&M Refrigeration 3

Control Setpoints The sequencer will allow for two sets of control setpoints. One set will be used for the lead machine and the other set will be used for the lag machine(s). This feature will allow the first compressor to start very rapidly and allow the user to delay starting of lag compressor(s). The various control setpoints utilized in the sequenced are detailed in the attached CCS Sequencer Control Overview document. The sequencer setpoints will also include high and low alarm and failure setpoints for both the brine return temperature and the floor temperature sensor(s). A low failure on any of the sensors will fail the compressors. Condenser Control Enhancements The CCS condenser control has been enhanced to meet the needs of the single and dual ice rink systems. The additional features discussed below will function the same in both the single and dual ice rink systems. A detailed overview of the standard CCS condenser control is covered in the attached document CCS Condenser Control Overview. Condenser Stage Selection The user is able to configure the condenser stages to support two pumps and either two single speed fans or one two-speed fan. The user has the ability to select all possible combinations from the condenser lead list screen. When the screen is saved, the data will be checked for conflicts and corrected. If the two-speed fan is selected, no single speed fans will be allowed in the lead list. Therefore, the CCS will automatically remove the single speed fan entry during lead list verification if the two-speed fan is also selected. Once the lead list is saved and corrected, the condenser status screen will automatically adjust to display the correct number of stages. An important note is that should memory be lost or re-initialized the lead list configuration will default to the single speed fan configuration. Auxiliary Contacts The condenser pumps and fan motors all have auxiliary contact which will be monitored. When the auxiliary contact does not match the pump or fan state for more then 3 seconds the CCS will generate an alarm. Condenser Heater (Option) An option exist to control the energizing of a condenser heater output based on a thermostat input. The heater control will allow the heater to be placed in one of the following modes: OFF, ON, AUTO. When in the OFF mode, the heater output will remain off until the mode is changed. When in the ON mode, the heater output will turn on and remain on until the mode is changed. In the AUTO mode, the heater output will turn on whenever the thermostat is closed and turn off whenever the thermostat opens. M&M Refrigeration 4

Condenser Sump Level (Option) An option exist to monitor a condenser sump low level cutout (LLCO) float. The CCS will monitor the LLCO float input and generate an alarm and shutdown all condenser pumps when the float is active. Non-Condensables (Option) An option exist to allow the CCS to compute the non-condensables value. The CCS will monitor a condenser liquid outlet temperature input and based off of the system refrigerant be utilized calculate the non-condensables value. Compressor Control Enhancements The CCS compressor control has been enhanced to meet the needs of the single and dual ice rink systems. In the sing rink configuration the CCS will control two recip compressors. In the dual rink configuration the CCS will control three recip compressors. The additional features discussed below will function the same in both the single and dual ice rink systems. A detailed overview of the standard CCS compressor control is covered in the attached document CCS Compressor Control Overview. Compressor Modes The compressors can be set to run in either manual, automatic or sequenced mode. In all modes they will operate on the control parameter selected on the sequencer control screen (Floor Temp or Brine Return). In the dual rink configuration, when operating on floor temperature the rink temperature farthest away from its setpoint will be used for the control parameter. Compressor Stage Control The CCS compressor control has been modified to allow the normal and fast delay timers to be set in minutes instead of seconds. This allows the user to set the compressor stage delays to a higher value then the sequencer stage delay timers. When configured in this manner the CCS will never unload the compressor. Instead the sequencer will simply instruct the compressor to stop once the control parameter is below the deadband or bandwidth for the time period defined by its unload normal or fast stage delay respectively. Compressor Stage Configuration Each compressor can be customized to utilize up to a maximum of 4 stages. A compressor configuration screen is used to allow the user to select which stages are being used, the capacity value associated with each stage, and whether a stage is energize to load or energize to unload. In this way, each compressor can be configured based on its specific number of loaders or unloaders. An important note is that should memory be lost or re-initialized the configuration of the compressors will be lost and need to be re-entered. M&M Refrigeration 5

Compressor Control Overview The CCS monitors a discharge temperature and an oil temperature sensor on each compressor. The sensor values are displayed on status screens and logged in the op and trend log. The discharge temperature input has a user setable high alarm and high failure setpoint. The oil temperature input has a user setable high and low alarm and failure setpoints. Each compressor has a starter fault input and a starter failure output. When the fault signal goes active high the CCS will generate a failure message, fail the compressors, and energize the starter failure output. When the signal goes low the CSS will turn off the starter failure output. The CCS controls the oil return solenoid on each compressor. The solenoid is opened when the compressor motor starts and will remain open until the compressor motor stops. The CCS controls the jacket cooling solenoid on each compressor. The solenoid is opened when the compressor motor starts and will remain open until the compressor motor stops. The CCS monitors a series of safety inputs for each compressor: a low oil pressure safety input, a discharge pressure safety input, and a low suction pressure safety input. When any of the input signals go active low the CCS will generate an appropriate failure message and fail the compressor. The CCS inhibits these failure unless the compressor is running. Compressor Jacket Cooling Pump The operator is able to place the jacket cooling pump into either the MAN STOP, MAN START, or AUTOMATIC mode of operation. In MAN STOP, the pump will remain stopped until the mode of operation is changed. In MAN START, the pump will be started and remain running until manually stopped or failed. In AUTOMATIC mode, the jacket cooling pump is run whenever a compressor is running. Regardless of its mode of operation the pump auxiliary will be monitored and if the auxiliary state does not match the pump state for more then 3 seconds, the pump will be failed. Chiller Control The CCS contains a custom chiller control function to meet the needs of the single and dual ice rink systems. In the single rink configuration the CCS will control two chiller brine pumps. In the dual rink configuration the CCS will control three chiller brine pumps. The following sections will discuss the various functions of the chiller control and the differences between the single and dual rink version. M&M Refrigeration 6

Chiller Overview The chiller s standard configuration is typically a critically charged vessel without any level control. The CCS controls two or three brine pumps (based on rink configuration) each with starter auxiliaries, a high level shutdown (HLS) float, and a brine flow switch. The CCS continually monitors the HLS float and will generate a failure message along with shutting down the compressors and all chiller pumps when the input becomes active low. Chiller Pump Control The operator is able to each brine pump into either the MAN STOP, MAN START, or AUTOMATIC mode of operation. In MAN STOP, the pump will remain stopped until the mode of operation is changed. In MAN START, the pump will be started and remain running until manually stopped or failed. In AUTOMATIC mode, the brine pumps are controlled by the CCS based on control mode (Brine Return or Floor Temperature) and the rink(s) setpoint. In the single rink configuration the CCS will control two brine pumps which are placed in a lead list. Only one pump is allowed to run at any time. If at any time the pump auxiliary contact and the pump output do not match for more then 3 seconds, the pump will be failed, the second pump will be started, and an alarm will be generated. If the second pump also fails the CCS will also fail the compressors. In the dual rink configuration the CCS has the ability to control three brine pumps. Pumps 1 and 2 are dedicated to rinks 1 and 2 while the third pump is a standby unit that must be manually selected and valved to the correct system. The operator selects whether the dedicated pump or the standby pump is supplying liquid to each rink on the pump selection screen. If at any time the pump auxiliary contact and the associated pump output does not match for more then 3 seconds, the pump will be failed and an alarm will be generated. In order to allow the standby pump to then be used the operator must manually select it for use on the appropriate rink. Brine Return Temperature Control In the single rink configuration with the pumps in AUTOMATIC mode the CCS will run the lead pump whenever a compressor is running or available to run (meaning not manually stopped or failed). If the lead pump fails based on its auxiliary input the next pump in the lead list will be started automatically. If both pumps fail the CCS will fail all the compressors. In the dual rink configuration with the pumps in AUTOMATIC mode the CCS will run both assigned rink pumps whenever a compressor is running or available to run (meaning not manually stopped or failed). If a pump fails based on its auxiliary input the other rink s pump will continue to run. If both pumps fail the CCS will fail all the compressors. M&M Refrigeration 7

Floor Temperature Control In the single rink configuration with the pumps in AUTOMATIC mode the CCS will run the chiller s lead pump whenever any of the compressors are running (Motor on). In the dual rink configuration with the pumps in AUTOMATIC mode the CCS will run the chiller pumps based on the sequencer control setpoint and deadband. The CCS will monitor the floor temperature input of each rink and compare it to the rinks temperature setpoint. If a rink s floor temperature is above the load deadband and a compressor is running the CCS will run the rink s associated pump. If a rink s floor temperature is below the unload dead band and the sequencer is not controlling on the associated floor temperature value because it is not the worst case, the CCS will stop the rink s pump. Flow Switch Monitoring The CCS will monitor a chiller flow switch input whether in single or dual rink configuration.. If the flow switch does not signify a flow within a user adjustable time delay (1-99 seconds) while a pump or compressor is running, the CCS will generate a failure, shutdown both pumps and the compressors. Chiller Level Control (Option) An option exist for the CCS to control the level in the chiller using a liquid feed solenoid and an OP float. The chiller s level will be maintained by opening and closing the liquid feed solenoid based on the state of the OP float. The CCS will also display the status of the float and the liquid solenoid on the chiller status screen. HPR Level Monitoring (Option) An option exist for the CCS to monitoring a high pressure receiver (HPR) low level alarm float. The CCS will generate an alarm when the float input goes active low. Emergency Stop The CCS continuously monitors an emergency stop input. When the input goes active low the CCS will generate an alarm, shutdown all compressors, and shutdown the condenser. All other auxiliary equipment will be failed or stopped. M&M Refrigeration 8

Operator Interface The operator interface to the control system is provided through the LCD display and keypad. Status screens are used to display dynamic data and hot keys are used to obtain entry into the major control functions listed below. Functions which have already been documented in other CCS manuals will be noted and referenced. EQUIP Hot Key SEQ Hot Key COND Hot Key COMP Hot Key CHLR Hot Key LOGS Hot Key MENUS Hot Key Status Screens The following list of status screens are available on the master panel. The example screens shown are for the dual rink configuration as the only difference is the addition of similar inputs or equipment. Main Status Screen M & M REFRIGERATION 8:32 AM 1.EQUIP MAIN STATUS 2.SEQ RINK 1 TEMP XXX.X DEGF 3.COND RINK 2 TEMP XXX.X DEGF 4.COMP BRINE RET TEMP XXX.X DEGF 5.CHLR SUCTION PRESS XXX.X PSIG 6.LOGS 7.MENUS CONDENSER PRESS XXX.X PSIG ALARM The following table lists the various parameters displayed on the main status screen. PARAMETER RINK 1 TEMP RINK 2 TEMP BRINE RET TEMP SUCTION PRESS CONDENSER PRESS DESCRIPTION The current value of the rink 1 floor temperature sensor. The current value of the rink 2 floor temperature sensor. The current value of the brine return temperature sensor. The current value of the system suction pressure. The current value of the condenser discharge pressure. M&M Refrigeration 9

Sequencer Status The Sequencer status page displays the state, mode, control parameter, and compressor data as shown below. SEQUENCER STATUS day mm/dd/yy hh:mm:ss FAST NORMAL SEQUENCE OPERATION TIMER TIMER CONTROL PARAMETER GROUP SETPOINT ------------------- ----- ------ --------------------- ----- ---------- increasing return xxx.x degf s1 xxx.x degf LEAD LIST COMPRESSOR STATUS CAPACTY MODE STATE ANTICYCLE --------- -------------- -------- ------- ------ ------------ --------- LEAD 2ND recip 1 recip 2 loaded trim xxx pct seq xxx pct seq running running xx:xx sec xx:xx sec 3RD recip 3 trim xxx pct seq running xx:xx sec The following table lists the various parameters displayed on the Sequencer status screen. TERM SEQUENCE OPERATION FAST TIMER NORMAL TIMER CONTROL PARAM GROUP SETPOINT LEAD LIST COMPRESSOR STATUS CAPACITY MODE STATE ACYCLE TIMER DEFINITION The state of the sequencer (DISABLED, DECREASING, INCREASING, HOLDING). The time remaining on the sequencer fast load/unload timer. The time remaining on the sequencer normal load/unload timer. What mode the sequencer is in Brine Return or Floor Temp and the current value of the control parameter being utilized. The current group number being utilized by the sequencer. The current setpoint value utilized by the sequencer. Shows the number of compressors in the lead list. The current order of the lead list. The current sequencer status of the compressors (UNAVAIL, STANDBY, FULL LOAD, TRIM). The capacity of piston compressors. The current mode of each compressor. The state of each compressor. The time remaining on each compressor s anti-cycle timer. M&M Refrigeration 10

Compressor Status The Compressor status page displays the setpoint, capacity, mode, state and other compressor data for each unit along with the jacket pump status as shown below. COMPRESSOR STATUS day mm/dd/yy hh:mm:ss DISCH OIL CAPACITY TEMP TEMP COMPRESSOR GRP SETPOINT CONTROL PCT DEGF DEGF MODE STATE ----------- --- ---------- ---------- -------- ------ ------ ---- ------------ RECIP RC1 s1 xxx.x degf xxx.x degf xxx xxx.x xxx.x auto running RECIP RC2 s1 xxx.x degf xxx.x degf xxx xxx.x xxx.x auto running RECIP RC3 s1 xxx.x degf xxx.x degf xxx xxx.x xxx.x auto running JACKET COOLING PUMP STATUS MODE STATE AUX ---------- ----- ------- automatic on closed The following table lists the various parameters displayed on the Compressor status screen. TERM COMPRESSOR GROUP & SETPOINT CONTROL CAPACITY DISCH TEMP OIL TEMP MODE STATE JACKET PUMP MODE JACKET PUMP STATE JACKET PUMP AUX DEFINITION The name assigned to each compressor. The current group and setpoint. The current active control parameter: S1-S4 or SY for sequencer control. The present capacity at which the compressor is operating. The current value of the compressors discharge temperature. The current value of the compressors oil temperature. The current mode for the compressor. The control state for the compressor. The current mode of the jacket cooling pump: MAN ON, MAN OFF, AUTOMATIC, or FAILED. The current sate of the jacket cooling pump: ON or OFF. The current state of the jack cooling pump aux: OPEN or CLOSED. M&M Refrigeration 11

Compressor Runtime Status The Compressor Runtime status page displays the current runtime and total runtime for each compressor as shown below. COMPRESSOR RUNTIME STATUS day mm/dd/yy hh:mm:ss COMPRESSOR RUNTIME TOTAL HRS ------------ ------------ --------------- RECIP RC1 xxxxxx.x xxxxxx.x hrs RECIP RC2 xxxxxx.x xxxxxx.x hrs RECIP RC3 xxxxxx.x xxxxxx.x hrs The following table lists the various parameters displayed on the Compressor Runtime status screen. TERM COMPRESSOR RUNTIME TOTAL HOURS DEFINITION The name assigned to each compressor. The number of hours the compressor has been running since its last start The total number of hours that the compressor has run. M&M Refrigeration 12

Condenser Status The Condenser status page displays the setpoint, state, lead list, and other condenser related data as shown below. The screen may vary slightly from on your system depending on which condenser options are included in your installation. CONDENSER STATUS day mm/dd/yy hh:mm:ss CONDENSER DATA STAGE DEVICE STATE AUX ------------------------------ ----- ----------- ------- ------ CONDENSER PRESS xxx.x degf 1 ec1 pump 1 on closed CONDENSER STATE increasing 2 ec1 pump 2 on closed 3 ec1 fan 1 on closed COND SUMP LLCO closed 4 ec1 fan 2 off open CONDENSER HEAT off CONDENSER LIQ TEMP xxx.x degf NON CONDENSABLES xxx.x psid REFRIGERANT xxxx The following table lists the various parameters displayed on the Condenser status screen. TERM CONDENSER PRESS The condenser outlet pressure. DEFINITION CONDENSER STATE The current staging activity. When the state is HOLDING, no stages will be added or removed. When the state is INCREASING, a stage will be added when the staging timer expires. When the state is DECREASING, a stage will be removed when the staging timer expires. COND SUMP LLCO The current state of the LLCO float: OPEN or CLOSED. COND HEAT COND LIQ TEMP NON CONDENSABLES REFRIGERANT STAGE DEVICE STATE AUX The current state of the condenser heater: ON or OFF The condenser liquid outlet temperature. The current calculated value of the non-condensables. The currently selected refrigerant. The lead list stage number. The list of condenser devices in lead list order. The current state of each stage. The current state of each stages auxiliary contact. M&M Refrigeration 13

Chiller Status The Chiller status page displays the floor temperature(s), brine temperatures, vessel and pump status for the chiller as shown below. The screen may vary slightly between the single and dual rink configuration. CHILLER STATUS day mm/dd/yy hh:mm:ss VESSEL STATUS RINK 1 FLOOR TEMP xxx.x degf ---------------------------------------- RINK 2 FLOOR TEMP xxx.x degf VESSEL STATE high shutdown BRINE RETURN TEMP xxx.x degf VESSEL HLS FLOAT closed BRINE SUPPLY TEMP xxx.x degf VESSEL OP FLOAT closed VESSEL LIQUID SOL closed BRINE FLOW SWITCH yes PUMP STATUS RINK PUMP MODE STATE AUX ---- ----------- ---------- ----- ------ 1 rink 1 pump automatic on closed 2 rink 2 pump automatic off open The following table lists the various parameters displayed on the Chiller status screen. TERM DEFINITION RINK 1 FLOOR The rink 1 floor temperature. RINK 2 FLOOR The rink 2 floor temperature. BRINE RETURN The chiller brine return temperature. BRINE SUPPLY The chiller brine supply temperature. VESSEL STATE The current chiller state: STOP, NORMAL, or HIGH SHUTDOWN. VESSEL HLS FLOAT The current condition of the vessel HLS float. VESSEL OP FLOAT The current condition of the vessel OP float. VESSEL LIQ SOL The current state of the vessel liquid solenoid. RINK The rink associated with the pump status information. PUMP The pump assigned to the rink: RINK 1 PUMP, RINK 2 PUMP, STANDBY PUMP. MODE The current mode of the pump: MAN ON, MAN OFF, AUTOMATIC, or FAILED. STATE The current state of each pump. AUX The current state of each pumps auxiliary contact. M&M Refrigeration 14

Miscellaneous Status The Miscellaneous status page displays information on miscellaneous alarms, exhaust fan conditions, sub floor heating, and snow melt pump status as shown below. The screen may vary slightly depending what options are configured on your system. MISCELLANEOUS STATUS day mm/dd/yy hh:mm:ss MISC ALARMS SUB FLOOR HEAT ----------------------------- -------------------------------------- EMERGENCY STOP normal RINK TEMP MODE STATE AUX REFRIGERANT DET normal ---- ---------- --------- ----- ------ HPR LLA normal 1 xxx.x degf automatic off closed 2 xxx.x degf automatic off open EXHAUST_FAN SNOW MELT PUMP ----------------------------- ----------------------- ENGINE ROOM TEMP xxx.x degf MODE STATE AUX FAN MODE automatic --------- ----- ------ FAN STATE off automatic off open The following table lists the various parameters displayed on the Miscellaneous status screen. TERM EMERGENCY STOP REFRIGERANT DET HPR LLA ENGINE ROOM TEMP FAN MODE FAN STATE RINK TEMP MODE STATE AUX SNOW MELT PUMP MODE/STATE/AUX DEFINITION The condition of the emergency stop input: ALARM or NORMAL. The condition of the refrigerant detection input: ALARM or NORMAL. The condition of the HPR LLA float input: ALARM or NORMAL. The current engine room temperature. The current engine room exhaust fan mode: MAN OFF, MAN ON, AUTOMATIC. The current engine room exhaust fan state: ON or OFF The rink associated with the sub floor heat information. The corresponding rink sub floor temperatures. The current mode of each sub floor heat pump: MAN OFF, MAN ON, AUTOMATIC, or FAILED. The current state of each sub floor heat pump: ON or OFF. The current condition of each sub floor pump aux: OPEN or CLOSED. The current mode, state, and aux condition of the snow melt pump. M&M Refrigeration 15

Lighting Status The Lighting status screen displays information on current lighting level for each rink as shown below. M & M REFRIGERATION 8:32 AM 1.EQUIP LIGTHING STATUS 2.SEQ 3.COND RINK 1 LEVEL X 4.COMP 5.CHLR RINK 2 LEVEL X 6.LOGS 7.MENUS ALARM The following table lists the various parameters displayed on the Lighting status screen. PARAMETER RINK 1 LEVEL RINK 2 LEVEL DESCRIPTION The current rink 1 lighting level. The current rink 2 lighting level. EQUIP Hot Key The presence of the EQUIP hot key allows the operator access to several of the ice rink functions such as sub floor warming, exhaust fan control, and lighting control. The menu diagram for the EQUIP hot key is as follows. EQUIP 1. SUB FLOOR WARMING 2. EXHAUST FAN 3. SNOW MELT PUMP 4. KW MONITORING 1. KWH SETPOINTS 2. SET KWH TOTALS 5. LIGHTING CONTROL EQUIP Menu Diagram M&M Refrigeration 16

Sub Floor Warming The Sub Floor Warming setup screen allows the operator access to adjust the floor warming setpoints for pump on, pump off, and temperature alarms. The layout of the dual rink system screen is as follows. The single rink screen would only show information for one rink. Screen Type - Data Entry SUB FLOOR WARMING day mm/dd/yy hh:mm:ss RINK 1 RINK 2 ---------------------------- ---------------------------- PUMP CONTROL automatic PUMP CONTROL automatic SUB FLOOR TEMP SETPOINTS SUB FLOOR TEMP SETPOINTS ---------------------------- ---------------------------- HIGH ALARM xxx.x degf HIGH ALARM xxx.x degf PUMP OFF ABOVE xxx.x degf PUMP OFF ABOVE xxx.x degf PUMP ON BELOW xxx.x degf PUMP ON BELOW xxx.x degf LOW ALARM xxx.x degf LOW ALARM xxx.x degf The following table describes the different data entry fields on the Sub Floor Warming setup screen. In a dual rink configuration there will be setpoints for each rink. TERM DEFINITION RANGE PUMP CONTROL The desired pump control mode command: NONE, Selectable MAN ON, MAN OFF, AUTOMATIC. When the screen is accessed the pump control command will always default to NONE regardless of whether a previously command has been selected. NONE just signifies that the operator does not want to make a change for the current control mode. HIGH ALARM The value at which the CCS will generate a high temperature alarm message. -58 : 122 DEGF PUMP OFF ABOVE The temperature setpoint at which the CCS will turn off the sub floor warming pump. -58 : 122 DEGF PUMP ON BELOW The temperature setpoint at which the CCS will turn on the sub floor warming pump. -58 : 122 DEGF LOW ALARM The value at which the CCS will generate a low temperature alarm message. -58 : 122 DEGF M&M Refrigeration 17

Exhaust Fan The Exhaust Fan setup screen allows the operator to adjust the fan control setpoints as shown below. Screen Type - Data Entry M & M REFRIGERATION 8:32 AM 1.EQUIP EXHAUST FAN 2.SEQ 3.COND CONTROL AUTOMATIC 4.COMP 5.CHLR 6.LOGS ON ABOVE XXX.X DEGF 7.MENUS OFF BELOW XXX.X DEGF The following table lists the various data entry fields on the Exhaust Fan setup screen. TERM DEFINITION RANGE CONTROL The desired exhaust fan control mode command: Selectable NONE, MAN ON, MAN OFF, AUTOMATIC. When the screen is accessed the fan control command will always default to NONE regardless of whether a previously command has been selected. NONE just signifies that the operator does not want to make a change for the current control mode. ON ABOVE The temperature setpoint at which to turn on the fan. 32 : 302 DEGF OFF BELOW The temperature setpoint at which to turn off the fan. 32 : 302 DEGF M&M Refrigeration 18

Snow Melt Pump The Snow Melt Pump setup screen allows the operator to change the operating mode of the snow melt pump. The layout of the screen is as follows. Screen Type - Data Entry M & M REFRIGERATION 8:32 AM 1.EQUIP SNOW MELT PUMP 2.SEQ 3.COND CONTROL AUTOMATIC 4.COMP 5.CHLR 6.LOGS 7.MENUS The following table describes the different data entry fields on the snow melt pump control screen. TERM DEFINITION RANGE CONTROL The desired pump control mode command: NONE, MAN ON, MAN OFF, AUTOMATIC. When the screen is accessed the pump control command will always default to NONE regardless of whether a previously command has been selected. NONE just signifies that the operator does not want to make a change for the current control mode. Selectable M&M Refrigeration 19

KWH Setpoints The KWH Setpoints screen allows the operator to enter the demand alarm and pulse with for the KW monitoring system. The layout of the screen is as follows. Screen Type - Data Entry M & M REFRIGERATION 8:32 AM 1.EQUIP KWH SETPOINTS 2.SEQ 3.COND DEMAND KW ALARM XXXX.X 4.COMP 5.CHLR KWH PER PULSE X.XXX 6.LOGS 7.MENUS The following table describes the different data entry fields on the KWH Setpoints screen. TERM DEFINITION RANGE DEMAND KW ALARM The KW setpoint at which the CCS will generate an alarm. 0 : 9999.9 KW KWH PER PULSE The KWH pulse width of the specific meter being used in the system..002 : 1.999 KWH/Pulse M&M Refrigeration 20

Set KWH Totals The Set KWH Totals screen allows the operator to adjust the values of the KWH accumulated totals. The layout of the screen is as follows. Screen Type - Data Entry M & M REFRIGERATION 8:32 AM 1.EQUIP SET KWH TOTALS 2.SEQ 3.COND KWH TODAY XXXXXXXX 4.COMP KWH THIS WEEK XXXXXXXX 5.CHLR KWH THIS MONTH XXXXXXXX 6.LOGS KWH THIS YEAR XXXXXXXX 7.MENUS The following table describes each data entry field for the Set KWH Totals screen. TERM DEFINITION RANGE KWH TODAY The total KWH used today. 0 : 99999999 KWH KWH THIS WEEK The total KWH for the week. 0 : 99999999 KWH KWH THIS MONTH The total KWH for the month. 0 : 99999999 KWH KWH THIS YEAR The total KWH for the year. 0 : 99999999 KWH M&M Refrigeration 21

Lighting Control The Lighting Control setup screen allows the operator to set the schedule for the lighting control function. In a dual rink configuration two screens will exist, one for each rink. The layout of the screen is as follows. Screen Type - Data Entry RINK 1 LIGHTING CONTROL day mm/dd/yy hh:mm:ss CURRENT LIGHTING LEVEL SCHEDULING g1 disabled SCHEDULE 1 SCHEDULE 2 SCHEDULE 3 WEEKLY SCHEDULE NUM TIME LEVEL NUM TIME LEVEL NUM TIME LEVEL --------------- --- -------- ----- --- -------- ----- --- -------- ----- SUN sch1 1 xx:xx xx g1 1 xx:xx xx g1 1 xx:xx xx g1 MON sch1 2 xx:xx xx g1 2 xx:xx xx g1 2 xx:xx xx g1 TUE sch1 3 xx:xx xx g1 3 xx:xx xx g1 3 xx:xx xx g1 WED sch1 4 xx:xx xx g1 4 xx:xx xx g1 4 xx:xx xx g1 THU sch1 5 xx:xx xx g1 5 xx:xx xx g1 5 xx:xx xx g1 FRI sch1 6 xx:xx xx g1 6 xx:xx xx g1 6 xx:xx xx g1 SAT sch1 7 xx:xx xx g1 7 xx:xx xx g1 7 xx:xx xx g1 8 xx:xx xx g1 8 xx:xx xx g1 8 xx:xx xx g1 The following table describes each data entry field for Lighting Control screen. TERM DEFINITION RANGE CURRENT Allows the operator to override the currently active control G1 - G3 LIGHTING LEVEL group. SCHEDULING Allows the operator to enable or disable lighting scheduling. ENABLE or DISABLE WEEKLY SCHEDULE The daily schedule which will be active on the indicated day of the week. SCH1 - SCH3 TIME The time that the desired group is active. Can be entered in 12 00:00-23:59 or 24 hour mode depending on system configuration. LEVEL The lighting level which will be active G1 - G3 M&M Refrigeration 22

SEQ Hot Key The SEQ hot key provides access to sequencer setup and control menus documented in the CCS Compressor Overview and CCS Sequencing Control Overview manuals. The Control Setpoints and Control Group Select screens were modified for the ice rink system as shown below. Sequencer Control Setpoints The Sequencer Control Setpoints screen allows the operator to setup the sequencer load and unload setpoints. The screen allows for different setpoints for the lead and lag machines to support the special requirements of the ice rink system. The layout of the screen is as follows. Screen Type - Data Entry SEQUENCER CONTROL SETPOINTS day mm/dd/yy hh:mm:ss LEAD LAG ------------- ------------- REFERENCE DATA LOAD UNLOAD LOAD UNLOAD ------------------------ ------ ------ ------ ------ SYSTEM CONTROL TEMP NORMAL BANDWIDTH xxx.x xxx.x xxx.x xxx.x degf xxx.x degf CONTROL DEADBAND xxx.x xxx.x xxx.x xxx.x degf SYSTEM CONTROL SETPT xx NORMAL STAGE DELAY xxx.x xxx.x xxx.x xxx.x min xxx.x degf FAST STAGE DELAY xxx.x xxx.x xxx.x xxx.x min The following table describes each data entry field on the Sequencer Control Setpoints screen. TERM DEFINITION RANGE NORMAL BANDWIDTH CONTROL DEADBAND NORMAL STAGE DELAY FAST STAGE DELAY The load and unload normal bandwidth define when normal staging stops and fast staging begins. If the difference between the setpoint and system control parameter is greater than the bandwidth fast staging is performed. The load and unload control deadbands define a zone around the setpoint where no staging action will be taken. The normal stage delay is used to add or remove stages when the difference between the system control parameter and the setpoint is outside the deadband but within the normal bandwidth. The fast stage delay is used to add or remove stages when the difference between the system control parameter and the setpoint is outside the normal bandwidth. 0 : 20 DEGF 0 : 20 DEGF 0 : 20 MIN 0.1 : 20 MIN M&M Refrigeration 23

Sequencer Control Group Select The Sequencer Control Group Select screen allows the operator to enter the group setpoints for the sequencer. The screen supports separate setpoint entries for each rink floor temperature and for brine return temperature. The layout of the screen is as follows. Screen Type - Data Entry SEQUENCER CONTROL GROUP SELECT mm/dd/yy hh:mm:ss GROUP 1 GROUP 2 GROUP 3 GROUP 4 ----------- ---------- ----------- ----------- RINK 1 FLOOR TEMP CONTROL SETPT xxx.x degf xxx.x degf xxx.x degf xxx.x degf LOW_ALARM xxx.x degf xxx.x degf xxx.x degf xxx.x degf LOW FAILURE xxx.x degf xxx.x degf xxx.x degf xxx.x degf RINK 2 FLOOR TEMP CONTROL SETPT xxx.x degf xxx.x degf xxx.x degf xxx.x degf LOW_ALARM xxx.x degf xxx.x degf xxx.x degf xxx.x degf LOW FAILURE xxx.x degf xxx.x degf xxx.x degf xxx.x degf BRINE RETURN TEMP CONTROL SETPT xxx.x degf xxx.x degf xxx.x degf xxx.x degf LOW_ALARM xxx.x degf xxx.x degf xxx.x degf xxx.x degf LOW FAILURE xxx.x degf xxx.x degf xxx.x degf xxx.x degf The following table describes each data entry field on the Sequencer Control Group Select screen. TERM DEFINITION RANGE CONTROL SETPT The sequencer will add or remove compressors to maintain the system control parameter at this control setpoint. -58 : 122 DEGF LOW ALARM An alarm is activated when the system control parameter is below this value. -58 : 122 DEGF LOW FAILURE An failure is activated when the system control value is below this value. -58 : 122 DEGF M&M Refrigeration 24

COND Hot Key The COND hot key provides access to the condenser setup and control menus documented in the CCS Condenser Control manual. COMP Hot Key The COMP hot key provides access to the setup and control menus for the compressors. Additional support information may be found in the CCS Compressor Overview manual. A compressor staging configuration screen was added for each compressor in the ice rink system as shown below. Compressor Staging Configuration The Compressor Staging Configuration screen allows the operator to define the number of loaders or unloaders for each compressor and the capacity associated with them. A separate screen will exist for each compressor in the system. The layout of the screen is as follows. Screen Type - Data Entry RECIP RC1 day mm/dd/yy hh:mm:ss STAGING CONFIGURATION STAGE CAPACITY NUMBER TYPE PCT ------ ---------- -------- NONE -------- xxx 1 unloader xxx 2 unloader xxx 3 not used xxx 4 not used xxx The following table describes each data entry field on the Staging Configuration screen. TERM DEFINITION RANGE STAGE The screen allows the operator to configure the compressor for up to four N/A NUMBER stages. TYPE This selectable field allows the operator to define whether the stage is used Selectable and if so what type: loader or unloader. CAPACITY This field defines the capacity associated with each stage. A minimum capacity value must be entered for the NONE stage to indict the value when all stages are inactive. 1 : 100 PCT M&M Refrigeration 25

CHLR Hot Key The presence of the CHLR hot key allows the operator access to the ice rink chiller functions. The menu diagram for the CHLR hot key is as follows. Pump Control CHLR 1. PUMP CONTROL 2. PUMP SELECTION 3. MISC SETUP CHLR Menu Diagram The Pump Control screen allows the operator to set the pump control for the chiller pumps. The layout of the screen is as follows. Screen Type - Data Entry M & M REFRIGERATION 8:32 AM 1.EQUIP CHILLER PUMP CONTROL 2.SEQ 3.COND RINK 1 AUTOMATIC 4.COMP RINK 2 NONE 5.CHLR 6.LOGS 7.MENUS M&M Refrigeration 26

The following table describes each data entry field on the Pump Control screen. TERM DEFINITION RANGE RINK 1 CONTROL The desired rink 1 pump control mode command: NONE, MAN ON, Selectable MAN OFF, AUTOMATIC. When the screen is accessed the pump control command will always default to NONE regardless of whether a previously command has been selected. NONE just signifies that the operator does not want to make a change for the current control mode. In a single rink system the screen will display pump 1 as the label for this entry. RINK 2 CONTROL The desired rink 2 pump control mode command: NONE, MAN ON, MAN OFF, AUTOMATIC. When the screen is accessed the pump control command will always default to NONE regardless of whether a previously command has been selected. NONE just signifies that the operator does not want to make a change for the current control mode. In a single rink system the screen will display pump 2 as the label for this entry. Selectable M&M Refrigeration 27

Pump Selection The Pump Selection screen is used in the dual rink configuration to allow the operator to identify which pump is associated with each rink. This is necessary as the dual rink system contains a third standby pump which must be manually valved to a rink. The layout of the Pump Selection screens is as follows. Screen Type - Data Entry M & M REFRIGERATION 8:32 AM 1.EQUIP CHILLER PUMP SELECTION 2.SEQ 3.COND RINK 1 RINK 1 PUMP 4.COMP RINK 2 STANDBY PUMP 5.CHLR 6.LOGS 7.MENUS The following table describes each data entry field on the Pump Selection screen. TERM DEFINITION RANGE RINK 1 CONTROL Indicates which pump is assigned to rink 1, either PUMP 1 or the Selectable STANDBY PUMP. RINK 2 CONTROL Indicates which pump is assigned to rink 2, either PUMP 2 or the STANDBY PUMP. Selectable M&M Refrigeration 28

Pump Lead List In the single rink configuration this screen will be replace the Pump Selection screen which will allow the operator to place the two pumps into a lead list order. The layout of the Pump Lead List screen is as follows. Screen Type - Data Entry M & M REFRIGERATION 8:32 AM 1.EQUIP CHILLER PUMP LEAD LIST 2.SEQ 3.COND LEAD PUMP 1 4.COMP 2ND PUMP 2 5.CHLR 6.LOGS 7.MENUS The following table describes each data entry field on the Pump Lead List screen. TERM DEFINITION RANGE LEAD Indicates which pump is selected as the lead pump. Selectable 2ND Indicates which pump is selected as the 2 nd pump in the lead list. Selectable M&M Refrigeration 29

Miscellaneous Setup The Miscellaneous Setup screen allows the operator to enter the various miscellaneous setpoints required for the control of the chiller. The layout of the screen is as follows. Screen Type - Data Entry MISC CHILLER SETUP day mm/dd/yy hh:mm:ss RUN PUMPS WITHOUT COMPRESSORS no RESTART PUMPS AFTER POWER FAIL? yes POWER FAIL RESTART TIME xxx.x min FLOW SWITCH ALARM DELAY xxx.x sec The following table describes each data entry field on the Miscellaneous Chiller Setup screen. TERM DEFINITION RANGE RUN PUMPS WITHOUT COMPRESSOR RESTART PUMPS AFTER POWER FAIL POWER FAIL RESTART TIME FLOW SWITCH ALARM DELAY This option allows the operator to instruct the chiller to run an automatic pump even if all compressors are stopped. This option allows the chiller pumps to be started automatically after a power failure. This is the maximum time power can be off before the chiller pumps will be unable to restart automatically. This is the maximum time the CCS will wait for the flow switch to indicate flow after a pump has started before generating an alarm and failing the pump and compressors. Selectable Selectable 0 : 60 Min 1 : 99 SEC LOGS Hot Key The LOGS hot key is similar to that shown in the CCS Logs Function Overview manual. MENUS Hot Key The MENUS hot key is similar to that shown in the CCS Additional Menus Overview manual. M&M Refrigeration 30