Loop Water Controller
Contents
1. Caution A The LWC is designed for indoor installation only not water proof Make sure there is sufficient space for service and maintenance Avoid installation at the following location e Exposure to shocks heat rain water leakage or direct sunlight e Any source of electromagnetic pollution e Installation on uneven vertical surface The installation of the LWC control box With Smart Manager optional Connect the terminal in the control box with the necessary wires to Smart Manager according to APPENDIX A 12Vdc Adaptor e A 12Vdc adaptor is needed to supply the voltage to the Smart Manager if power supply 12Vdc Ground from LWC is not wired to Smart Manager 4 2 Water Temperature Sensor Installation The installation of the water temperature sensor is as the figure 10 The sensing element is at the end point of the sensor The end point of the sensor should be placed at the center of the pipe as counter to the water flow Do not place the end point of the sensor near or touching the pipe hose Figure 10 Water Temperature Sensor Installation 4 3 Outdoor Air Temperature Sensor Installation The installation of the OD air temperature sensor is needed to be placed at the open space Do not place the sensor near the heating cooling object which will affect the reading of the sensor 4 4 Sticker Control Box The sticker of wiring diagram and external wires connection guidelines are placed inside the LWC contr2. 38 Screw threads per inch 60 Conical Screw Thread and 13 6mm Figure 5 Water Temperature Sensor 3 3 2 Outdoor Air Temperature Sensor Connect the 2 wires of outdoor air temperature sensor to the terminal block T2 T2 Figure 6 Outdoor Air Temperature Sensor 3 4 Default Setting Reset Switch SWL imm REDLED GREENLED Figure 7 Dip Switch The SWI switch top of the red and green led on LWC is used to reset the system setting to the default setting Two conditions are applied 3 5 LCD Panel Key Explanations ESC After the power supply is Off switch the switch 1 to the ON position Turn On the power supply and it will set the system setting to the default setting After the power supply is Off switch the switch 1 to the OFF position Turn On the power supply and it will set the system setting to the previous memory 1 2 3 A 4 5 6 v 7 8 9 4 ESC 0 gt Figure 8 LCD Panel This display screen show two rows of data where each row contains 16 characters Enter key is used to execute the navigation instruction Esc key is used to cancel the navigation instruction back to previous menu The 2 arrows keys permit page scrolling item selection and modifying the selected value The numbered keys are used to change the parameter setting 4 0 INSTALLATION WIRING INSTRUCTION 4 1 LWC Control Box Installation Unit in mm Figure 9 Control Box Outline and Dimension
3. Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Loop Water Controller Internal View LWC Hardware Outlook LWC Outlook LWC Internal View Water Temperature Sensor Outdoor Air Temperature Sensor Dip Switch LCD Panel Control Box Outline and Dimension Water Temperature Sensor Installation Pre heat amp Pre cool Outdoor Air Reset LCD Panel Description Main menu Display Status Menu Display Setting Menu Display Test Menu Display Error Menu Display iii 23 23 23 24 25 26 1 1 10 tA o NN BW 1 0 SAFETY CONSIDERATION Installation and maintenance should be performed by qualified technicians and installers who are familiar with local code and regulation 1 1 Installation Recommendations e All field wiring must be installed in accordance with the national wiring regulation e Ensure that the rated voltage of the unit correspond to the name plate before commencing wiring work according to the wiring diagram e The unit must be GROUNDED to prevent possible hazard due to installation failure e Never unplug any cables printed circuit board terminal blocks relay modules or power plugs when power is applied 2 0 GENERAL DESCRIPTION 2 1 General Introduction The Water Loop Controller LWC i
4. Loop Water Controller McQuav Air Conditioning Engineered for flexibility and performance TABLE OF CONTENTS LIST OF FIGURES 1 0 SAFETY CONSIDERATION 1 1 Installation Recommendations 2 0 GENERAL DESCRIPTION 2 1 General Introduction 2 2 LWC Features 2 3 Operation Condition 2 4 Installation site 3 0 HARDWARE DESCRIPTION 3 1 LWC Hardware Outlook 3 2 LWC Control Box 3 3 Sensor 3 3 1 Water Flow Sensor 3 3 2 Outdoor Air Temperature Sensor 3 4 Default Setting Reset Switch 3 5 LCD Panel Key Explanations 4 0 INSTALLATION WIRING INSTRUCTION 4 1 LWC Control Box Installation 4 2 Water Temperature Sensor Installation 4 3 Outdoor Air Temperature Sensor Installation 4 4 Sticker Control Box 5 0 SYSTEM SPECIFICATION 5 1 System On Off function 5 2 Pump control function 5 3 12 stages of heat rejection and heat addition control 5 4 Pre heat amp Pre cool 5 5 Outdoor OD Air Reset 5 6 Emergency Protection 5 7 Error Description 6 0 OPERATION USER MANUAL 6 1 Starting 6 2 Operation Menu 6 2 1 Main Menu 6 2 2 Status Menu 6 2 3 Password Protection 6 2 4 Setting Menu 6 2 5 Test Menu 6 2 6 Error Menu 6 3 Operation Limits il ii iii gt gt 2 NNNNA 10 10 10 11 11 11 11 13 14 14 15 16 16 17 17 17 18 18 21 21 22 7 0 SERVICE AND TROUBLESHOOTING GUIDE 7 1 Service 7 2 Troubleshooting Guide APPENDIX A APPENDIX B APPENDIX C LIST OF FIGURES Figure 1 Figure 2
5. EMI and EM2 will send signal to Off the system with the alarm activates 100 times minute continuously 4 Sensor Error If either the Water Supply sensor or OD Air sensor or both of them gives an error signal due to disconnection or not in function during the system operates the alarm will activate 20 times per minute The unit will be Off heat rejection and heat addition stages shall be shut down 14 5 7 Error Description ERR Description LCD Panel Code Water Sensor Error Water Sensor ERR Low Water Temperature Water Low Temp High Water Temperature Water High Temp Water Pumpl Flow Failure Flow Error Pump1 Water Pump2 Flow Failure Flow Error Pump2 Too High Water Temperature Shutdown Hi Temp Shutdown Too Low Water Temperature Shutdown Lo Temp Shutdown Outdoor Sensor Failure OD Sensor ERR The table above shall be referred when there is any errors occur during the operation of the system Error code will be shown differently at different hardware display whenever there is an error occurs The Error LED on the LCD panel will blink when there is any error occurs Water Sensor Error Outdoor Sensor Failure There will be an error signal and unit will be Off when the water sensor and OD sensor fail to operate during the system On The alarm will Off and unit will return to normal operation once the water sensor and OD sensor error is fixed Low Water Temperature High Water Temperature There wi
6. F in response to a drop in outside air temperature from 16 C 61 F to 17 C 1 F This ramp shall be linearly proportional OD Air Reset Range OD Air Temp C Figure 12 Outdoor Air Reset 5 6 Emergency Protection 1 Low Too Low temperature If the water flow temperature is lower than 13 C adjustable the alarm will be activated for 20 times minute if the water flow temperature is lower than 10 C adjustable the alarm will be activated for 100 times minute the emergency switch EMI and 2 signal will be sent out The alarm buzzer will activate continuously 2 High Too High temperature If the water flow temperature is higher than 40 C adjustable the alarm buzzer signal will be activated for 20 times minute if the water flow temperature is higher than 43 C adjustable the alarm buzzer signal will be activated for 100 times minute the emergency switch EMI and EM2 will send signal to Off the system with the alarm activates 100 times minute continuously 3 Loss of Flow For automatic mode pump control the lead pump is On first The water flow switch will start to check for water flow after 10s If it gives an error signal after checking of 15 seconds adjustable the lead pump will be Off with the alarm activates 20 times minute and the lag pump will On If the water flow switch give an error signal after another checking of 15 seconds adjustable the lag pump will be Off and the emergency switch
7. gt Reset Run Time To reset the record of the total pump run time to 0 hour gt Min Run TM xxxs The minimum time required for a pump to operate Setting gt Output Config gt Cool Stage xx gt Heat Stage xx To set the number of heat rejection cool or addition heat stage for the system operation gt Interstage Time xxs The time delay between each stage before is start to operate Setting gt Temp gt Water Temp Alarm gt High TMP xxx C F Water temperature point to warn the user system still On of high water temperature gt Too Hi TMP xxx C F Maximum allowable water temperature before EM1 EM2 and Alarm output is triggered gt Low TMP xxx C F Water temperature point to warn user system still On of low water temperature 19 gt Too Low TMP xxx C F Minimum allowable water temperature before system shut EM1 EM2 and Alarm output is triggered gt Stage Temp Diff gt Cool Stage xxx C F gt Heat Stage xxx C F The temperature difference between On and Off of a particular stage gt Set Stage Temp gt Heat xxx C F gt Heat Add xxx C F It is the first heat cool stage temperature On setting Refer to Appendix C for commissioning sheet Setting gt ODAresetEnable Disable To enable disable the Outdoor Air Reset function Setting gt ODresetTMP xxx C F The range of temperature to be set for heat addition that refers to the outdoor air temperature It can only be
8. age4 4 at pe i ane Drum je e Hersisuez 5 fs fe jet age 91 85 Hetreesisane d Loon 9 Herreeasue 9 Herreea sues Example of description From the Table 1 above if OUTA is set as Heat addition stagel OUT3 OUTI will be automatically recognized as Heat addition stage2 Heat addition stage4 In the mean time OUTS OUT12 will be automatically be set as Heat reject stagel Heat reject stage8 The temperature differential 3 C will determine the On and Off limit setting by 3 C difference On and Off limit setting shall be arranged in the form from the lowest to the highest Every changing On Off of stages will have a delay time of 15 seconds adjustable before the next changes This system setting applied the same for temperature unit degree Celsius and degree Fahrenheit F 12 5 4 Pre heat amp Pre cool This pre cool amp pre heat operates when the system is Off S1 open circuit This function is activated according to the too high low temperature set The operation and setting of this function is described as the following Pre cool heat temperature differential 5 C fixed When S1 is open circuit 4 Close Open Heater 3 Close Heater 3 Heat reject 3 b Close Heater 2 Open Heater 2 i eat reje
9. ater temperature adjustable and the temperature higher than the too high water temperature adjustable 15 6 0 OPERATION USER MANUAL 6 1 Starting LCD Display Screen Be pem 1 2 3 Menu Key Pad S croll Numbers 4 5 6 7 8 9 4 5 0 4 x Figure 13 LCD Panel Description Escape Enter When the power supply is On Power LED green is lighted Start up screen for 3 second the information shown in display screen McQuay LWC Controller After showing the start up screen the screen proceeds with the default display The default display is the water temperature and the highest stage of heat rejection or addition User can enter into the main menu and 4 sub menus The menu display will return to default display if it remained idle for 30 seconds The default display shows Water Temp xx Cooling Stage xx or Heating Stage xx 16 6 2 Operation Menu 6 2 1 Main Menu By pressing the c button the display screen will shows main menu item as below lt 1 Status Main menu Setting Test Error v ESC Figure 14 Main Menu Display In all the menu structure press the c button to proceed with the next level of menu press 5 button to return to the previous menu Press dl button when there is a setting condition for the item press the A or numbers button to select the item Press the ll button again to set the changes The setting menu can only be modifi
10. ct 2 Open Heater 1 i Close Heater 1 estem 1 4 E pre Tn 45 Pre To 43 Pre Pre 2 Pre Th Pre_heat temperature Pre Tn low temperature Figure 11 Pre heat amp Pre cool Bpen Heat reject 3 Open Heat reject 2 Open Heatreject 1 pre T 2 Pre Pre Pre Pre Tc Pre cool temperature Pre Tc Too high temperature Cn w When the temperature reaches the too high low temperature adjustable this function will be activated the pump and output stages will On accordingly The output stages will Off accordingly as well with reference to the temperature differential of 5 C fixed The table below shows an example of this function For example Too high temperature 43 adjustable Too low temperature 10 C adjustable No of heating stage 3 adjustable No of cooling stage 3 adjustable 13 Stage On Temp Off Temp Heating stage 3 8 13 Heating stage 2 9 14 Heating stage 1 10 15 Cooling stage 1 43 38 Cooling stage 2 44 39 Cooling stage 3 45 40 5 5 Outdoor OD Air Reset Outdoor air reset will be incorporated into the current LWC It will increase the heat addition stages set point to increase the unit performance in heating mode The heat addition set points shall be able to be increased in a response to a drop in outside air temperature The set point increase shall be operator defined from 1 C 2 F to 5 C 10
11. e In manual mode Only one pump can operate if the pump is set as manual mode Either one of the pump can be set to operate when the system is On The checking on the water flow is the same as the lead pump in automatic mode This mode will not have lead lag cycle If the water problem is verified and fixed user can reset the remote switch S2 and the pump will resume operation Alternatively it can be reset by power supply 5 3 12 stages of heat rejection and heat addition control A total of 12 stages of heat rejection and heat addition control can be established according to pre set temperature range The heat rejection and heat addition temperature setting shall be distributed in sequence and continuous difference by 1 C The Table 1 and Table 2 below show an example of stages temperature setting Condition of the following example setting i 4heat addition output stages adjustable and 8 heat rejection output stages adjustable ii Heat reject and add stage temperature differential of 3 C adjustable ii Heat addition stage temperature 20 C adjustable Heat rejection stage temperature 30 C adjustable 11 Table 1 System setting temperature S Pm m 12 om Heat add stage 4 DW our i a erat wage ae UTS o m hesse Table 2 System setting temperature TE o tSt Limit Off Limit Function EEE EM Setting F Miel 12 4 Heat Heataddst
12. e due 7 120402 Aouabsawy UY SP SI 2 110 uonipuo2 bunpae dund dung 21 sabos jndjng uondia2sa 104110 WUA 803 WAHT Cie Nd 44 A3864 WGISAS 03 2 1 0 2 N 2027 2 000 NI 2 9bubpuQ 77 27 APPENDIX APPENDIX LWC Commissioning Sheet Date Person Incharge Mode Auto Manual Switch Check 5 Min un Heat Add Output Configuration Heat Reject stages Interstage Time sS Temperature Unit F Stage Temperature poe Heat Reject Temperature Cool Stage Differential Heat Stage Temperature Cool Stage Differential Low Temp High Temp Too Low Temp Shutdown Too High Temp Shutdown OD Air Reset Enable Disable OD Air Reset Temp 26
13. ed when the system S1 is Off When the specific parameter to be set is out of the range the panel will notify the operator by popup message The following pages show the structure of every main menu 6 2 2 Status Menu In Status menu the screen displays the following Power LED green colour is On x zt A 1 Off 2 On Off Pump Water Flow Yes Water Temp xxx C F OD Temp xxx C F Temp Status 1 Cool Heat On Off Output Stage On Off xxx C F 2 Cool Heat On Off On Off xxx C F 3 12 Unused Pump Run Time Pumpl xxhr Pump2 xxhr wv Figure 15 Status Menu Display ESC ESC User can view the system condition according the structure shown in the figure 15 6 2 3 Password Protection 4 digits password entry is needed to enter and change Setting and Test menu The default password is 8888 Password access is denied when there is more than 3 times of invalid password keyed in It will automatically return to the default display after pressing the Enter button or after 3 seconds It will also prohibit the user from accessing the Setting and Test menu for 10 minutes If user forgets the password the password can be reset by pressing the button behind the LCD panel Password recovered to default 8888 6 2 4 Setting Menu When LWC system is operating user can only view the detail setting but cannot made cha
14. fuse tripped blown No display on LCD screen or LCD Check wiring and contact connection keypad not in function Restart power supply Alarm is not in function Check wiring and contact connection Check alarm condition Sensor Error Check wiring and contact connection Check sensor condition Sensor temperature not accurate Wiring length resistance affects the reading Pump not in operation Water temperature too high low Check water flow switch amp water supply valve Check piping condition Check pump internal wiring connection Pump not switching Check pump setting Set pump in Auto mode Heat add reject stages not in function or Check wiring and contact connection Operation not according to system Check output configuration setting Set output setting configuration accordingly Check cooler cooling tower heater boiler condition OD Air Reset not in function Check OD Air Reset setting Enable the OD Air Reset item Kindly contact the dealer if none of these checks solve the problem 23 35680 0 OL ON Lyd 49018 WOLLOA 241 078 Meal 201 241 HOUMS NOU NN 102 amp i dd Wo 153415 174100 102 EWS AIBITIOHINOO HSN AN 40 5135 AlN APPENDIX A 5 eJnjpleduie Jw 00 0 Josuas e4nibleduls 1840M 101 41125 5 5 20 92 86 ping 7 1201102 Aouebeulj 2506 0 snb j
15. ll be an error signal when the water temperature is in the warning temperature adjustable The unit is still in normal operation with the alarm signal on Once the water temperature is falls in the preset range again the alarm is Off and unit will operate normally Too High Water Temperature Shutdown Too Low Water Temperature Shutdown The LWC will send out the emergency shutdown 2 and alarm signal when the water temperature is in the maximum allowable temperature adjustable The unit is still in normal operation with the alarm signal on Once the water temperature falls in the preset range again the alarm and EMI EM2 will be Off The unit will operate normally Too High temperature must be higher than High temperature setting and Too Low temperature must be lower than the Low temperature setting Water Pumpl Flow Failure Water Pump2 Flow Failure The error can be eliminated by the reset On Off switch and system will be reset The alarm signal can be Off by pressing any button on the LCD panel but error code will keep appearing on the hardware display until reset On Off switch is set Warning temperature is the water temperature between the low water temperature adjustable and the too low water temperature adjustable and the temperature between high water temperature adjustable and too high water temperature adjustable Maximum allowable temperature is the water temperature lower than the too low w
16. nges in this sub menu In Setting menu the screen displays the following Setting LED red colour is On i lt lt Mode Auto Manual Lead Pump 1 2 Pump Switch Cycle xxxhr Pump Switch Check Time xxxs Reset Run Time Min Run TM xxxs Cool Stage xx Heat Stage xx Interstage Time xxs ei 7 N High TMP xxx C F Too Hi TMP xxx C F Water Temp Alarm Low TMP F Too Low TMP xxx C F Output Config 1 Cool Stage xxx C F Stage Temp Diff Heat Stage xxx C F Setting Temp Heat Rej xxx C F Heat Add xxx C F v ESC Set Stage Temp ODA reset Enable Disable OD reset TMP xxx C F New Password xxxx Temp Unit C F Buzzer Enable Disable Key Back Light Enable Disable LCD Back Light Enable Disable Date DD MM YY Set Time hh mm ss KR v ESC ESC Other ul Figure 16 Setting Menu Display 18 Description of the Setting menu structure Setting gt Pump gt Mode Auto The lead lag cycle of the lead and lag pump operation is activated gt Mode Manual Only the lead pump is activated in the operation gt Lead Pump 1 2 The first or second pump can be set as lead pump in the operation gt Switch Cycle xxxhr The time period for a pump to operate until another pump switch to operate gt Pump Switch Check Time The time to check the water flow after pump is On for 10s
17. ol box in order to have the correct guidance for installation Both of the diagrams are shown in APPENDIX B 10 5 0 SYSTEM SPECIFICATION 5 1 System On Off Using remote On Off switch S1 1 Standard Switch without Smart Manager il Smart Manager to start or stop the operation of the LWC The LWC shall function as e System On if the remote On Off switch S1 is in closed circuit e System Off if the remote On Off switch S1 is in opened circuit 5 2 Pump control function In automatic mode Once the system is On the LWC will initialize the lead pump when there is a requirement for heat rejection or addition output to operate and also during pre cool or pre heat operation 10 seconds after the lead pump is On checking will be done on water flow switch This checking is done for 15 seconds adjustable If the water flow switch detects no water flow the lead pump will be Off error is shown on display alarm output is triggered and buzzer will be activated Then the lag pump will be On 10 seconds after the lag pump is On the checking on the water flow switch will be done for 15 seconds adjustable If after 15 seconds the water flow switch still cannot detects water flow the system will be Off error is shown on display alarm output is triggered and buzzer will be activated Then the emergency shut down EM1 EM2 will be activated The lead pump lag pump sequence is automatically changed based on pump switch cycle time adjustabl
18. op Water Controller monitors the water loop pump status and high low loop temperature conditions Should the water loop pump fail or loop temperature exceeds the predefined limits the LWC will close a set of contacts and put all units into the emergency shutdown mode with network controller Remote On Off Switch i On Off Switch ii Network Controller The LWC On Off system is by using either 1 On Off Switch or ii Network Controller system to start stop the operation of the LWC system Remote Reset Input The remote reset input switch is used to reset the system when error occurred without restart the power supply of the system Water Flow Switch Input A water flow switch input is used to detect the availability of water supply to the system High and Low Water Temperature Protection A water sensor is used to measure the water temperature It protects the system by sending error signal and shutoff the system when water temperature is too high low Pre heat amp Pre cool The system is able to provide protection for the temperature exceeding the too high low temperature when the system is Off Outdoor OD Air Reset The heat addition On Off limit setting of the system is able to be increased in a response to a drop in the OD air temperature LCD Panel The LCD panel interface consists of LCD screen and keypad All operating conditions system alarms and errors water loop system setting and test menu can be monitored and set from
19. s designed for Water Source Heat Pump water loop control system This device can be operated as a stand alone system without Smart Manager or a combination of networking control system with Smart Manager The system can operate according to 12 sets of pre set data to open or close the heat rejection or heat addition stage for controlling the water loop operation Figure 1 Loop Water Controller Internal View 2 2 LWC Features The LWC is a microprocessor based control panel designed to provide sophisticated control and monitoring of the loop water temperature of a water source heat pump system Primary control features offered by the LWC are as follows Loop Circulating Pump Control Allows 2 loop circulating pumps with manual or auto lead lag control where pump operation is interchangeable Heat Rejection amp Addition Output Stages There is a total of 12 sets of data output can be pre set as heat addition or heat rejection stages Sensor 1 Outdoor OD Air Temperature Sensor ii Water Temperature Sensor 2 types of sensors are used to sense the OD air temperature and water temperature Alarm Indication An additional alarm indication output can be used to give a signal if there is an error during the system operation Attention is needed when the alarm indication is activated A buzzer is installed in the LCD panel and will be activated when there is an error occurs Emergency Shutdown EM1 EM2 The Lo
20. set when the ODAreset is enable Setting gt Other gt New Password xxxx To set a new password 4 digits gt Temp Unit C F To set the temperature unit gt Buzzer Enable Disable To enable disable the buzzer on LCD panel gt Key Back Light Enable Disable To enable disable the LCD panel key back light gt LCD Back Light Enable Disable To enable disable LCD panel screen back light gt Set Date DD MM YY To set the date for the LWC system gt Set Time hh mm ss To set the time for the LWC system 20 6 2 5 Test Menu In Test menu the screen displays the following Test LED orange colour is On lt lt A 1 Pump On Off 2 Pump On Off 1 Stage On Off 2 Stage On Off 3 Stage On Off 4 Stage On Off 5 Stage On Off 6 Stage On Off Test 7iiStage On Off 8 Stage On Off 9 Stage On Off 10 Stage On Off 11 Stage On Off 12 Stage On Off Buzzer On Off Alarm Out On v P ESC Figure 17 Test Menu Display The LWC provides the Test menu to check on the operation of the system The Test menu must be operated only when the system is Off or dry run Under the testing menu the operation of the system 1s prohibited The display returns to default display when it is idle for 3 minutes or by pressing the ESC button 6 2 6 Error Menu In Error menu the screen displays the following Error LED red colour is On 77 fud History Delete v ESC Fig
21. this LCD panel Password Protection Password entry is needed for authority to change the setting and configuration of the system 2 3 Operation Condition The operating condition of LWC is as the following Temperature 0 50 C Relative Humidity 0 95 Input Voltage Limits 198 264VAC 50 Hz 2 4 Installation Site The LWC is designed for indoor installation only not water proof Make sure there is sufficient space for service and maintenance Avoid installation at the following location Exposure to shocks heat rain water leakage or direct sunlight Any source of electromagnetic pollution e Installation on uneven vertical surface 3 0 HARDWARE DESCRIPTION 3 1 LWC Hardware Outlook Hardware contacts specification 51 12Vdc Ground 52 53 24Vac Output 1 12 220 240Vac Pumpl amp 2 220 240Vac 3A Alarm 220 240Vac EMI 12Vdc EM2 Ground gure R1234 SENSO O78 mmm WATER PUMP2 ALARM BUZZER Note Unit in mm Figure 2 LWC Hardware Outlook 5 3 2 LWC Control Box Figure 3 shows the outlook and dimension of LWC control box Figure 3 LWC Outlook Figure 4 shows the internal structure of LWC Figure 4 LWC Internal View 3 3 Sensor 3 3 1 Water Temperature Sensor Connect the 2 wires of water temperature sensor to the terminal block T1 T1 4 AWR Package AWR 300 300V 105 Thermistor with Nickel Copper package A NPT 18 Copper Screw
22. ure 18 Error Menu Display In the Error menu a maximum of 10 errors is recorded User can delete all the errors recorded in this menu 21 6 3 Operation Limits Pump Auto Manual Lead Pump Pump Switch Cycle Auto Water flow detection check time after 1st pump On Pump Switch Check Time Pump Minimum Run Time Number of Heat Reject Stage Number of Heat Add Stage Heat Add Reject Interstage Time Password Temperature Unit Buzzer Disable Key Back Light LCD Back Light E Temp unit Temp unit F Lower Upper Lower Upper Too High Temperature emergency shutdown 109 113 F Too Low Temperature emergency shutdown Stage Temperature Differential S Heat Add Stage 20 43 44 64 109 tage Temperature H z n eat Reject Stage 30 C e 44 F n F OD Air Reset Temperature CREE JESE A 22 7 0 SERVICE AND TROUBLESHOOTING GUIDE 7 1 Service Service should be performed by authorized dealer or qualified contractor Caution A e Do not attempt to do any service or maintenance when the unit is operating e Off the main power supply before doing maintenance e Unauthorized modification of the unit is not allowed 7 2 Troubleshooting Guide Trouble shooting must be performed by authorized dealer or qualified contractor Check Point LWC cannot start Check power supply plug Check wiring and S1 contact connection Circuit breaker or
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