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TM_i-BX(-N)_NC05_00_06_20_EN

MEHITS S.p.A.

●

TECHNICAL MANUAL

Version NC05 - Translation of the Original Instructions

Alarm code

Description

NOTES

108

uS hw overheating

109

uS data communication

110

uS compressor stall

111

uS bus dc overcurrent

112

uS hwf bus dc curr.

113

uS bus dc volt

114

uS hwf bus dc volt

115

uS input volt

116

uS hwf input volt

201

uS bus dc power supply

202

uS hwf no power supply

203

uS ntc overtemp.

204

uS ntc undertemp.

205

uS ntc faulty

206

uS hwf synchro

207

uS invalid saf. par.

208

uS fw faulty

209

uS hw faulty

INFORMATION:
For more information and possible solutions on A140 secondary codes refer to the PSD2 driver manual

For all the secondary codes of alarm A140 it is possible to set the type of reset (manual or semi-automatic). If semi-automatic is set, the logic will
perform an n. number of reset attempts according to parameter

139J

, for a period of time

139K

. Upon reaching

139J+1

, the alarm will become

manual. Below are the configuration masks

See the Power+ alarm table
Power+ alarms are detailed nearby alarm code A140.
Set for Manual reset
Set for Semi-automatic reset

Summary of Contents for i-BX

Page 1: ...ginal Instructions 1 The information in this document may be modified without prior notice The reproduction and or dissemination of this document even in part is prohibited without the written consent of MEHITS SpA TECHNICAL MANUAL Translation of the original instructions i BX N Version NC05 EN ...

Page 2: ...TM_i BX N _NC05_00_06_20_EN MEHITS S p A TECHNICAL MANUAL Version NC05 Translation of the Original Instructions 2 Page left intentionally blank ...

Page 3: ...in a known and easily accessible place to refer to as necessary during the entire life span of the unit This manual was prepared by MEHITS S p A reproduction even in part is prohibited The original copy is kept on file by MEHITS S p A Any use of the manual other than for personal reference requires the prior authorisation of MEHITS S p A In the interest of improving the quality of its products MEH...

Page 4: ...igital input 31 4 2 SETPOINT REGULATORS 32 4 2 1 Hot offset 32 4 2 2 Cold offset 33 4 3 ANTI CONDENSATION FUNCTION 34 4 4 COMPRESSOR REGULATION 35 4 4 1 BLDC compressor start up procedure 35 4 4 2 Inverter compressor oil recovery function 35 4 4 3 Compressor operating limit protection 36 4 4 3 1 High compression ratio prevention zone 2 37 4 4 3 2 High condensation pressure prevention zone 3 37 4 4...

Page 5: ...tive 50 4 13 5 DHW storage tank antifreeze 51 4 14 DEFROST 51 4 15 HEAT PUMP INHIBITIONS 53 4 15 1 Operation outside envelope 53 4 15 2 External air temperature 53 4 15 3 External air temperature and water temperature 54 4 16 DEMAND LIMIT 55 4 17 TRAY HEATER 55 4 18 CURRENT OPERATION MODE NOTIFICATION 55 4 19 NIGHT FUNCTION 56 5 MANAGEMENT OF DOMESTIC HOT WATER DHW 57 5 1 MANAGEMENT OF THE DHW 3 W...

Page 6: ...h if ignored or not duly acted upon could put not only the Unit but also the functions of the Software and the various electronic parts at risk OBLIGATION Indicates the need to take appropriate precautions perform specific activities to avoid compromising the protection of the points of access only reserved for authorised operators and or operators in charge of ensuring the normal operation of the...

Page 7: ...nal air temperature probe will be used for offset management The type of regulation will be possible by setting specific parameters INFORMATION i BX indicates the chiller only unit i BX N indicates the reversible heat pump unit i BX N indicates both units when discussing the machine functions 1 1 OPERATING REQUIREMENTS The application software discussed in this document is designed for use on i BX...

Page 8: ...ormal operating conditions 2 2 GENERAL CHARACTERISTICS OF THE INTERFACE 2 2 1 PASSWORD MANAGEMENT By entering a numeric password it is possible to access four menu levels The access levels are as follows User password for the standard user 00 menu access Installer password for the installer of the unit 00 01 02 03 04 06 07 09 menu access Service password for maintenance and assistance operators 00...

Page 9: ...y valve in operation i BX N only 4 Unit displayed 9 Fan in operation 14 Defrost active i BX N only 5 Domestic hot water storage tank temperature i BX N only 10 Pump active STATUS 8 Operating status of the unit The values that can be displayed are the following OFF CASC OFF set from cascade OFF alarm OFF due to alarm OFF DIN OFF from digital input No req There is no heating cooling request The unit...

Page 10: ...xternal air temperature 3 Zone temperature 7 External air temperature 4 Zone Humidity 8 Pump status Low Temperature system side information Only visible if the zones are configured with parameter 016A and parameter 0101 3 1 Zone no 7 External air temperature 2 LT Low Temperature 8 Pump status 3 Zone temperature 9 Mixed water temperature 4 Zone Humidity 10 Mixing valve opening 5 Zone temperature se...

Page 11: ...atus Boiler Off Replacement Integration Fan information Only visible with Service password 1 Pressure setpoint 4 Fan speed 2 Fan status OFF Manual Regulation Dripping Hp prev In CH DHW with DHW priority if there is a request from both sides this condition starts ON by Hp High pressure alarm prevention parameter 1416 with HP Prev active PreFan Fan start before compressor start Flux Flow alarm Antif...

Page 12: ...tations Manual Compressor in manual mode PumpD Pump down active Startup Compressor in startup phase High DP High Delta Pressure for startup High T High system temperature Max set Maximum time in DHW mode exceeded Al envel Envelope alarm Oil rec Oil recovery active 7 Return pressure 4 Compressor frequency 8 Return temperature System pump information Only visible with Service password 1 Water temper...

Page 13: ... 0611 0612 but in this case in addition to the appearance of the message the DHW pump starts at maximum speed Sn Freeze Antifreeze Sniffer Max T Forcing of overboost due to setpoint not reached Max set Temperature very far from the setpoint 7 Unit output water temperature 4 Temperature difference 8 Storage tank heater status Storage tank heater NOT active Storage tank heater not active Inertial st...

Page 14: ...g two N THC in series to connector 4 see chapter HARDWARE of the controller and using the Modbus protocol it is possible to control 2 zones 1 high temperature and 1 low temperature zone Control of each individual system zone will be possible through this interface Dimensions Connections 2 3 1 AMBIENT THERMOSTAT ADDRESSING PROCEDURE 1 Initial display 2 Press at the same time for 3 seconds keys 3 Ro...

Page 15: ...oint comfort in summer mode HT3 25 0 C 5 0 32 0 P0029 Room setpoint comfort in winter mode HT3 20 0 C 5 0 32 0 P0030 Room setpoint comfort in summer mode LT1 25 0 C 5 0 32 0 P0031 Room setpoint comfort in winter mode LT1 18 0 C 5 0 32 0 P0032 Room setpoint comfort in summer mode LT2 25 0 C 5 0 32 0 P0033 Room setpoint comfort in winter mode LT2 18 0 C 5 0 32 0 P0034 Date format 1 dd mm yy 2 mm dd ...

Page 16: ...tionship between plant and ambient 0 Unit work on ambient request 1 Unit work indipendent 1 0 1 P011E Differential to activate the high temperature zone 1 0 C 0 1 9 9 P011F Differential to activate the low temperature zone 1 0 C 0 1 9 9 P011L Type of device room 6 0 Serial probe 1 N THC 1 0 1 P011M Type device 6 0 Temperature 1 Temperature Humidity 1 0 1 P011N Type of regulation of mixed circuit p...

Page 17: ...tdoor reset winter LT1 0 NO 1 YES 0 0 1 P0168 Fixed setpoint for 1st mixed circuit Winter 38 0 C P015R P015T P0169 Enble outdoor reset summer LT1 0 NO 1 YES 0 0 1 P016A Enable zones 0 NO 1 YES 0 0 1 P0170 Fixed setpoint for 1st mixed circuit Summer 19 0 C P015M P015P P0171 Enable supply setpoint offset for high humidity 0 NO 1 YES 0 0 1 P0172 Set room RH supply offset start for high humidity 70 0 ...

Page 18: ...led period 0 0 1 P0213 Enable the antilegionella cycle on Monday 0 NO 1 YES 1 0 1 P0214 Enable the antilegionella cycle on Tuesday 0 NO 1 YES 0 0 1 P0215 Enable the antilegionella cycle on Wednesday 0 NO 1 YES 0 0 1 P0216 Enable the antilegionella cycle on Thursday 0 NO 1 YES 0 0 1 P0217 Period for antilegionella cycle 1 d 1 30 P0218 Enable the antilegionella cycle on Friday 0 NO 1 YES 0 0 1 P0219...

Page 19: ...ault Unit Min Max P0401 Multi unit control unit number 1 1 4 P0402 Cascade type 0 ONE UNIT FOR DHW 1 ALL UNIT FOR DHW 2 EXCHANGER FOR DHW 1 0 2 P0403 Insertion delay 1 min 0 99 P0404 Disinsertion delay 1 min 0 99 2 4 6 MENÙ 05 Num Par Description Default Unit Min Max P0506 Type of regulation compressors heating 0 P 1 P I 1 0 1 P0507 Differential activations compressor heating 8 0 C 0 5 15 0 P0508 ...

Page 20: ...reeze alarm plant size 1 0 1 P0634 Plant exchanger antifreeze alarm setpiont 4 0 C 99 9 99 9 P0635 Plant exchanger antifreeze alarm differential 3 0 C 0 99 9 P0636 Max temperature to stop the heat pump 90 0 C 0 999 9 P0637 Type regulation plant 0 Outlet 1 Inlet 0 0 1 P0638 Differential to stop oil recovery for low temperature 2 0 C 0 99 9 P0639 Out plant temperature threshold to stop oil recovery ...

Page 21: ...Y CLOSED 1 NORMALLY OPEN 0 0 1 P0986 Reverse logic digital input 8 0 NORMALLY CLOSED 1 NORMALLY OPEN 1 0 1 P0987 Reverse logic digital input 9 0 NORMALLY CLOSED 1 NORMALLY OPEN 1 0 1 P0988 Enable external serial probe for outdoor reset 0 NO 1 YES 0 0 1 2 4 11 MENÙ 10 Num Par Description Default Unit Min Max P1000 Calibration value B1 probe 0 0 99 9 99 9 P1001 Calibration value B2 probe 0 0 99 9 99...

Page 22: ...alarm by transducer 39 5 Bar 0 50 0 P130V Total numbers of compressor 1 1 1 P130W Unit Air Water 0 UNIT WATER WATER 1 UNIT AIR WATER 1 0 1 P130X Unit Reversible 0 NO 1 YES 0 0 1 P130Y DHW production method 0 Dedicated exchanger 1 3way valve 1 0 1 P130Z Unit Reversible 0 Only heat 1 Heat Cool 1 0 1 P1310 Enable Analogic input B6 0 NO 1 YES 0 0 1 P1311 Type of NTC of B6 0 NTC 1 NTC HT 0 0 1 P1312 En...

Page 23: ... Defrost startup delay 300 s 1 9999 P132Z Temperature limit control selection 0 B2 1 B1 0 0 1 P1330 S1 pressure minimum alarm thresold 1 0 Bar 290 0 P1331 P1331 S1 pressure maximum alarm thresold 45 0 Bar P1330 290 0 P1332 Probe S2 alarm enable 0 NO 1 YES 1 0 1 P1333 Analog input S2 type 0 NTC CAREL 1 CAREL NTC HT 2 NTC SPKP T0 3 0 10V EXT SIGNAL 4 TEMP CUSTOM 1 5 PT500 0 0 5 P1334 S2 temperature ...

Page 24: ...4 way valve closing 30 s 0 999 P134S Max increase speed rate going to target speed in oil recovery rps s 1 0 rps s 0 9 9 P134T Enable force compressor OFF by on time under 134U threshold 0 NO 1 YES 1 0 1 P134U Time threshold to turn compressor OFF after running below 134C 120 min 0 999 P134V Valve opening at start up in Defrost P2 100 0 100 P1350 Inverter type 0 CAREL inverter mng 1 APY inverter m...

Page 25: ...P1388 PID proportional gain Valve A 6 0 0 0 800 0 P1389 PID Integral time Valve A 100 c 0 1000 P138V Discharge gas temperature control threshold for Zone 1a 105 c 70 0 350 0 P138W Discharge gas limit temperature for Zone 1a 110 c 80 0 350 0 P138X Discharge gas temperature control threshold SIAM scroll only for zone 1b 115 c 70 0 350 0 P138Y Discharge gas limit temperature SIAM Scroll only for Zone...

Page 26: ... 0 1 P139P Alarm reset type 98 power 0 Manual 1 Semi Automatic 1 0 1 P139P Alarm reset type 99 power 0 Manual 1 Semi Automatic 1 0 1 P139Q Alarm reset type 101 power 0 Manual 1 Semi Automatic 1 0 1 P139Q Alarm reset type 102 power 0 Manual 1 Semi Automatic 1 0 1 P139Q Alarm reset type 103 power 0 Manual 1 Semi Automatic 1 0 1 P139Q Alarm reset type 104 power 0 Manual 1 Semi Automatic 1 0 1 P139Q A...

Page 27: ...r 0 99 9 P1415 Condensation reg Cut off 0 1 Bar 0 9 9 P1416 Condensation reg Set force 30 0 Bar 0 999 9 P1417 Condensation reg Max speed 0 1 Bar 0 9 9 P1418 Evaporation set 11 5 Bar 1 0 99 9 P1419 Evaporation reg Prop Band 3 0 Bar 0 99 9 P1420 Evaporation reg Max speed 1 0 Bar 0 9 9 P1421 Evaporation reg Set force 7 5 Bar 0 999 9 P1422 Evaportaion reg Cut off 1 0 Bar 0 9 9 P1423 Type of plant pump...

Page 28: ... A050 High evaporation temperature alarm MOP A051 High condensation temperature alarm A052 EEPROM alarm A053 Low suction temperature alarm A054 Anti legionellosis alarm A055 Th Tune 1 Temperature probe faulty A056 Th Tune 1 Device offline A094 Defrost disabled due to maximum time reached A095 Th Tune 2 Temperature probe faulty A096 Th Tune 2 Device offline A109 Low compressor pressure from pressur...

Page 29: ...de Description NOTES 0 No pending error alarm 1 Overcurrent INVERTER OPERATION RELATED ALARMS 2 Motor overload 3 Overvoltage 4 Undervoltage 5 Overheating 6 Undertemperature 7 HW Overcurrent 8 Motor overtemperature 9 Drive fault 10 Cpu error 11 Default param 12 DC bus undulation 13 Serial communication timeout 14 Thermistor error 15 Autotuning error 16 Drive disabled 17 Motor phase missing 18 Fan f...

Page 30: ...S ntc faulty 206 uS hwf synchro 207 uS invalid saf par 208 uS fw faulty 209 uS hw faulty INFORMATION For more information and possible solutions on A140 secondary codes refer to the PSD2 driver manual For all the secondary codes of alarm A140 it is possible to set the type of reset manual or semi automatic If semi automatic is set the logic will perform an n number of reset attempts according to p...

Page 31: ...nits with DHW enabled it is possible to set the system DHW priority using parameter 0014 default value DHW It will be possible to set the machine operating modes using the menu or the digital input the operating mode type selection is possible using parameter 0100 BY KEYBOARD or BY DIGITAL INPUT 4 1 1 MODE SELECTION USING THE MENU 0100 BY KEYBORAD Mode change using the machine keypad pldPro Press ...

Page 32: ...NE and cannot be changed For the default values of the various parameters see the parameters table 4 2 1 HOT OFFSET When the system is set to heating the delivery water temperature is calculated based on the climate curves defined following the function described in the following chart The x axis shows the external temperature the y axis the delivery water temperature This function can be enabled ...

Page 33: ...correction For the default values of the various parameters see the parameters table 4 2 2 COLD OFFSET Cold offset occurs when with a system set to cooling the delivery water temperature is calculated based on the values defined by the following chart The x axis shows the external temperature the y axis the delivery water temperature This function can be enabled or disabled using parameter 0154 Ex...

Page 34: ... cooling climate curve 0154 is enabled If the relative humidity measured by the ambient thermostat exceeds the value set at parameter 0157 for the low zone 0172 the water setpoint increases until it reaches the maximum temperature The maximum water temperature is the result of the sum of the setpoint calculated according the cooling climate curve and the value set in parameter 0158 for the low zon...

Page 35: ...nverter compressors and POWER CAREL PSD1 or PSD2 drivers At start up the compressor is brought to rotation at the start up speed start up speed as indicated by parameter 138G This speed is maintained irrespective of the regulation request for the whole duration of the minimum start up time parameter 1351 At the end of this period the compressor speed modulation is automatically adjusted based on t...

Page 36: ...sor nominal threshold the set MOP threshold The suction and discharge pressures define a work point Depending on the control zone corrective actions take place to keep or return the compressor within the operating limits and therefore prevent compressor alarms Zone Description Condensation temperature C Evaporation temperature C 1 2 3 4 5 6 7 8 9 1 Zone inside the operating limits prevent is in an...

Page 37: ...hm management parameters are 138V 138W 138X 138Y Action distance T Discharge C Control threshold Power reduction Limit threshold Compressor block Power increase speed reduction progressive Normal operation Hz f demand envelope position Device Description Compressor 1 Decrease of the power increase speed 2 Power reduction Exv 4 4 3 2 High condensation pressure prevention zone 3 Custom zone 3 is onl...

Page 38: ... Modbus Master communication protocol By selecting Power as inverter type the menu makes available 13 masks containing the driver configuration parameters The Power parameters may be accessed using the mask Using the Power menu it is possible to scroll through the masks showing the parameter settings for the compressor inverter combination of the machine CAUTION DO NOT CHANGE THE PARAMETERS OF MEN...

Page 39: ...rnal air T 133Y maximum speed par 133W Max speed inverter custom 2 if 133Y External air T 133X maximum speed par 1368 Max speed inverter if External air T 133Y maximum speed par 133V Max speed inverter custom Note for parameter 133Y the hysteresis is 0 5 C fixed right for parameter 133X the hysteresis is 0 5 C fixed left See the following chart as an example For the default values of the various p...

Page 40: ...QUALIZATIONS AT START UP Parameter 131K is used to set the type of valve pre opening before the start of the compressor in compressor startup conditions with pressure difference defined by parameter 1358 not being met With 131K YES the valve pre opening is equal to the number of steps defined by parameter 131Q no relation with the requested capacity On i BX N units always set 131K YES Other parame...

Page 41: ...llowing function Pressure 100 Cut Off 1422 Forcing setpoint 1421 Speed High Speed 131P Min Speed 131N Forcing 1420 Prop band 1419 Setpoint 1418 4 9 2 CONDENSATION CONTROL As far as condensation control i BX N units have double fan management in Cooling Mode for i BX units and in chiller operation for i BX N units In addition to fan regulation based on the condensation pressure in chiller operation...

Page 42: ...eed regulation based on the external temperature and any regulation speed SUPERMINIMUM MINIMUM HIGH when the condensation pressure exceeds the value given by parameter 1434 the fan automatically switches to the next higher speed step As soon as the pressure value falls below the value represented by the difference between the values of parameters 1434 1435 the fan returns to the step of the corres...

Page 43: ...llowing the temperature regulator demand meaning continuous on when the compressor is active by setting parameter 0143 SNIFFERS In order to allow the correct regulation sniffers will be managed the pump will be activated at regular intervals for the time set using parameter 0147 Time on sniffer plant 5 seconds before the expiry of this time if the water temperature read by the regulation probe B2 ...

Page 44: ...33H LOP MOP and EEV low overheating alarms probe fault with the exception of regulation probes The regulation of the heater for the production of system water will follow the same regulation algorithm of the compressor in heating operation The heater will be activated immediately ignoring any delay set in parameter 0616 For DHW production see paragraph 7 2 3 HP DHW storage heater P0202 3 or delive...

Page 45: ...t without counting the possible time delay 0616 the delay refers to probe B2 and starts as soon as the same falls below the regulation setpoint 0507 irrespective of the value of B7 when B7 regulation setpoint 0507 x 0309 and B2 regulation setpoint 0507 counting the possible time delay if also B2 has reached a value equal to the regulation setpoint If there is no storage tank it will however be nec...

Page 46: ...1 REPLACEMENT HEAT SOURCE Refer to paragraph 6 11 1 Replacement heater replacing the heater parameters as follows 010G 010H 0303 0306 The boiler hysteresis is also managed through parameter 0316 By introducing parameter 0316 boiler regulation is ON OFF without delays or integrals the boiler is switched off with B7 0153 or the climate control calculated setpoint the boiler is switched on with B7 01...

Page 47: ...e set in the Boiler switching on inhibition time parameter has elapsed if other than 0 the function of this last parameter is to inhibit the switching on of the alternative heat source in integration mode in order to give time to the heat pump to reach normal operation regime for example in case of switching on when the system water is cold As for Integration heater also for the alternative heat s...

Page 48: ...exchanger from the formation of ice by activating the protection heater and the pump if off when the water temperature falls to a certain value which can be set through parameter 0622 It will be possible to set an antifreeze alarm this alarm will activate following the same criteria as the heater but with a dedicated parameter 0634 Heaters are activated based on the function described below ON Ant...

Page 49: ... Pump off hysteresis 0142 This function is only active when the unit is OFF The sniffer parameters are 0150 Time on sniffer antifreeze and 0151 Time off sniffer antifreeze for the sniffer function details refer to the Pump in sniffer mode section If during the sniffer activity the detected water temperature is such to enable the antifreeze function described in the Exchanger antifreeze paragraph t...

Page 50: ...otect the internal ambient from excessive cold When active it uses the available resources as configured for normal system heating HP delivery heater alternative heat source based on the function described below Enabled OFF HP Room air T C Room antifreeze setpoint 0140 Room antifreeze disable hysteresis 011E 011F The Heat Pump will work based on the set antifreeze setpoint default 5 C if inhibited...

Page 51: ...ameter 0229 The heater is activated based on the function described below ON OFF DHW heater DHW storage tank T B3 C DHW antifreeze setpoint 0229 DHW antifreeze hysteresis 0230 For the default values of the various parameters see the parameters table 4 14 DEFROST The defrost function can be enabled using the Manufacturer Menu Mnu13 while the set defrost start and end parameters time scales etc can ...

Page 52: ...g on the external air temperature when the air temperature read by the external probe B4 falls below the threshold set by parameter 0816 Differential activation T threshold the defrost start pressure defined by parameter 0808 is reduced by the value set in parameter 0817 Defrost input differential according to the proportional band set in parameter 0818 Defrost input proportional band Differential...

Page 53: ...ed below Low external temperature inhibition Attivo OFF Unitblock External air T B4 C External low Tunit stop setpoint 133Z External low Tunit stop hysteresis 0312 High external temperature inhibition Attivo OFF Unitblock External air T B4 C External high T unit stop setpoint 0515 External high T unit stop hysteresis 0516 Any heating request is met with the available resources delivery heaters alt...

Page 54: ...R TEMPERATURE The heat pump is inhibited compressor startup inhibition when the water temperature reaches the maximum value set through parameter 0636 near the air temperature set using parameter 133E This value will change dynamically according to the band set with parameter 133H decreasing in proportion to the decrease of the external air temperature differential set with parameter 133F in accor...

Page 55: ...sponding immersion heater switches on if configured When the demand limit stops if TDHW 0022 or 0023 the heater switches off if 0022 or 0023 TDHW 0209 the heater stays on until set overboost 0209 is reached For the default values of the various parameters see the parameters table 4 17 TRAY HEATER This function can be enabled using the parameter and is used to activate the heater in the defrost wat...

Page 56: ...nverter compressor revolutions are defined by a parameter The inverter compressor revolution limitation acts as maximum compressor variation limit The temperature regulator will continue to adjust normally while the compressor will be limited downstream the temperature regulator With the fan speed limitation based on the external air temperature in chiller operating mode during the night the speed...

Page 57: ...top and then restart meeting the set safety time scales Switching will take place based on the function described below from system to domestic hot water and vice versa ON OFF Delay OFF compressor OFF pump 131J 131L ON OFF ON OFF Compressor Pump 3 way Delay ON pump ON compressor 131H Always respected are Compressor ON ON minimum time and Compressor OFF ON minimum time 3 way valve switch time 0231 ...

Page 58: ...ATERS HEAT PUMP or 0202 ONLY HEAT PUMP and 0300 1 in this case the storage tank will be loaded using the heat pump as far as this is capable of heating the water after which the immersion heater or in its absence the delivery heater will take charge of the operation The individual functions are described below 5 2 1 HEAT PUMP ONLY The heat pump is activated to produce DHW if the temperature in the...

Page 59: ...This time is needed to prevent immediate return to the production of DHW following a request for DHW which will occur at every expiry of 0227 therefore preventing the possibility that the system is never served If the 0227 time expires when 0022 0513 B3 0022 or 0223 0513 B3 0023 at the expiry of 0226 the unit will return to DHW production mode until 0222 or 0223 has been fully reached The selectio...

Page 60: ...setpoint has been reached 0022 0023 the DHW heater comes on with a fixed delay of 30s following the overboost setpoint 0209 When this setpoint has been reached it will turn on again at 0209 0210 and turn off at 0209 or if the storage tank water temperature continues to decrease when 0022 or 0223 is reached depending on the function below ON OFF DHW storage tank T B3 Compressor Overboost diff 0210 ...

Page 61: ...in case of heat pump inhibition the delivery heater will be used to satisfy the DHW setpoint DHW heater Delivery heater Whenever the unit stops producing DHW it becomes available for the production of system water For the default values of the various parameters see the parameters table ON OFF DHW storage tank T B3 Compressor Overboost diff 0210 Proportional band DHW 0513 DHW setpoint 0022 or 0023...

Page 62: ...day to Sunday Periodic the anti legionellosis function can be performed at intervals from 1 to 30 days parameter 0217 The first day to be counted for the anti legionellosis period will be Sunday The following chart indicates the time required to complete disinfection according to the temperature If the water temperature does not exceed 60 C counting does not begin When instead the water temperatur...

Page 63: ... 1 Connector for terminal and application discharge 2 Connector for application discharge 3 PLD terminal connector 4 RS485 tLAN connection 5a Valve 1 control output 5b Valve 2 control output 6 Relay digital output 7 Digital input 8 Probe analogue input 9 Analogue output 10 Serial board 11 External probe power input 12 Power input 230 Vac for UPCA version 13 LED 14 tLAN RS485 jumper Digital inputs ...

Page 64: ... are listed below together with the methods for changing address with respect the one initially set by the supplier The devices are connected to connector 4 J10 of the controller Table of Modbus network device addresses Module Modbus address Method for changing address PSD1 or PSD2 inverter 5 Dip switch High temperature TH tune ambient thermostat 11 Change of address from keypad with User password...

Page 65: ...pt 3 J18 B8 N A B9 N A B10 4 20 mA Low pressure B11 NTC Compressor delivery temperature B12 NTC Compressor intake temperature FREE 2 opt optional in relation to the factory configuration 1 Enable with parameter 0232 The probe is automatically enabled by enabling DHW 2 Enable with parameter 0315 or automatic enable of the probe with system type requiring at least one low temperature zone 3 Enable w...

Page 66: ... of use is affected by the selection of parameter 0100 if this is configured as mode change using the keypad the ID7 input will automatically be set as boiler backup Otherwise it will be set for the management of the DHW only operating mode The boiler backup digital input is connected to the boiler alarm contact In case of boiler alarm status inhibition with replacement operating mode active the s...

Page 67: ...ery heater enabled Analogue Outputs Connector Type Description J5 Y1 N A Y2 N A Y3 PWM 0 10VDC AC EC fan Y4 0 10VDC LT1 mixed valve FREE 2 The Y3 analogue output is used to manage the modulating fan The output can be controlled in two modes 0 10V or phase cut for MCHRTF regulators The working mode is set using parameter 136L 0 10V or phase cut Selecting phase cut will make parameters 136M 136N and...

Page 68: ...tion 9 1 1 PROPORTIONAL ACTION The proportional action sets a basic control action for what is currently happening The value of this action is proportional to the error i e the deviation of the measured unit in relation to the setpoint This action is defined using the proportional constant Kp also known as proportional gain calculated with this formula 𝐾𝑝 100 𝐵𝑝 Where Bp is the value of the propor...

Page 69: ... following table shows the reactions on the system caused by the increase of the derivative time and resulting increase of the derivative constant Parameter Increases Constant Increases Promptness of response Overshoot Balancing time Error at full power Stability Td Kd Increases slightly Decreases Decreases slightly Does not change Improves The derivative action can be disabled by setting the deri...

Page 70: ...E_I_O UT_CUST_THR PAR_SAFE_TO _I_OUT_MAX_C UST_THR PAR_SAFE_TO _LOW_COS_FI PAR_SAFE_CO S_FI_LR_THR SNB110FGYMT 407 407 0 13 1200 120 0 SNB130FGBMT 407 407 0 13 1200 120 0 SNB172FEKMT 476 476 120 15 5 20 0 6 TNB220FLHMT 450 450 130 18 5 10 0 7 DNB28FAAMT 379 379 1 30 1200 120 0 TNB220FSNMT 361 361 5 18 1200 120 0 DNB28FAEMT 361 361 5 18 1200 120 0 DNB36FAEMT 361 361 5 18 1200 120 0 DNB36F40MT 361 3...

Page 71: ...TM_i BX N _NC05_00_06_20_EN MEHITS S p A TECHNICAL MANUAL Version NC05 Translation of the Original Instructions 71 ...

Page 72: ...MEHITS S p A TECHNICAL MANUAL Version NC05 Via Caduti di Cefalonia 1 36061 Bassano del Grappa VI Italy Ph 39 0424 509500 www melcohit com ...

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