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HIdRos LZT P4U Series Technical Manual
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HIdRos LZT P4U Series Technical Manual

High efficiency air to water heat pumps
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HIGH EFFICIENCY AIR TO WATER HEAT PUMPS
WITH E.V.I. COMPRESSORS
LZT P4U/P4S
SERIES
TECHNICAL MANUAL
Multiple instructions:
the instructions before
the unit
Rev. B 11-2022

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Summary of Contents for HIdRos LZT P4U Series

  • Page 1 HIGH EFFICIENCY AIR TO WATER HEAT PUMPS WITH E.V.I. COMPRESSORS LZT P4U/P4S SERIES TECHNICAL MANUAL Multiple instructions: the instructions before the unit Rev. B 11-2022...
  • Page 2 LZT P4U/P4S Declaration of conformity MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 3 LZT P4U/P4S INDEX 1. INTRODUCTION ..............................................................................................................................................................................................................................................................................................................................................2. SAFETY ..................................................................................................................................................................................................................................................3.2 Other versions ............................................................................................................................................................................................................. 3.9 C ..................................................................

  • Page 4: Table Of Contents

    LZT P4U/P4S 5. UNIT START UP ............................................................................................................................6. USE ................................6.2 Stop .................................................................................................................................... 6.6 CIRC ................................................................................................... 7. UNIT MAINTENANCE .................................................................... 7.2 Access to the unit ............................................................................................................................8. DECOMMISSIONING ................................................................
  • Page 5 LZT P4U/P4S 1. INTRODUCTION 1.1 Preliminary information these instructions. 1.2 Aim and content of the manual instructions. 1.3 How to store this manual user. 1.4 Manual Update 1.5 How to use this manual MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev.
  • Page 6 LZT P4U/P4S 1.6 Potential Risks POTENTIAL LOCATION OF METHOD OF INJURY PRECAUTIONS RISK RISK Burns. severe burns. unit enclosure severe burns. unit. severe burns. open. Entire unit Entire unit MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 7 LZT P4U/P4S 1.7 General Description of Symbols Used BANNED WARNING ACTION REQUIRED MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 8 LZT P4U/P4S 1.8 Safety symbols used GENERAL RISK ELECTRICAL HAZARD MOVING PARTS HOT SURFACES SHARP SURFACES EARTH CONNECTION READ AND UNDERSTAND THE INSTRUCTIONS RECOVER OR RECYCLE MATERIAL 1.9 Limitations and prohibited use MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev.
  • Page 9 LZT P4U/P4S Manufacturer: PD322111 +39 049 9731022 123456 1LZT.0302.NNRV U-1A 0312 Modello Matricola Model Serial number 3/2017 Categoria PED Data di fabbricazione PED Category Manifacture date R410A 2088 Tipo refrigerante Gruppo fluido Refrigerant type Fluid group 10 Kg 10 Kg 20,88 ton 20,88 ton Carica refrigerante...
  • Page 10 LZT P4U/P4S 2. SAFETY 2.1 Warning re potentially hazardous toxic substances • • ENVIRONMENTAL PROTECTION : 2.1.3 Persistence and degradation 2000. 2.1.4 Effects of discharges 2.1.5 Exposure controls and personal protection 2.1.6 Professional exposure limits R410A 2.2 Refrigerant handling MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev.
  • Page 11 LZT P4U/P4S 2.3 Prevent inhalation of high vapor concentration 2.4 Procedures to be adopted in the event of accidental release of refrigerant 2.5 Main Toxicological Information Regarding the Type of refrigerant used 2.5.1 Inhalation sphere. 2.5.2 Contact with skin 2.5.3 Contact with eyes 2.5.4 Ingestion 2.6 First Aid Measures 2.6.1 Inhalation...
  • Page 12 LZT P4U/P4S 3. TECHNICAL CHARACTERISTICS 3.1 Unit description 3.1.1 Frame 3.1.2 Refrigerant circuit 3.1.3 Compressors 3.1.4 Source heat exchanger 3.1.5 Fans 3.1.6 User heat exchangers protection. MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 13 LZT P4U/P4S 3.1.7 Electric enclosure 3.1.8 Microprocessors 3.1.9 Control and protection devices 3.2 Other versions 3.2.3 SA Version 3.2.4 SE Version 3.2.5 HA Version 3.2.6 HE Version 3.2.7 Version LS 3.2.8 Super low noise and ultra low noise versions HA/XL - HE/XL and HE/NN MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev.
  • Page 14 LZT P4U/P4S 3.2.13 Version P4U 1. User water heating: 2. User water cooling: 3. Simultaneous user Cooling + heating: P4U Version 7°C 7°C 12°C 12°C 35°C 35°C 30°C 30°C 3.2.13 Versione P4S MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev.
  • Page 15 LZT P4U/P4S 1. User water heating: 2. User water cooling: 3. Domestic hot water production (D.H.W.): 4. User water cooling + D.H.W. production: P4S Version 55°C 55°C 50°C 50°C 35°C 7°C 7°C 30°C 12°C 12°C 3.3 Accessories description 3.3.1 Condensate discharge drip tray with antifreeze heater (BRCA) 3.3.2 User water strainer 3.3.3 Antifreeze kit (RAEV4) 3.3.4 Rubber vibration dampers (KAVG)
  • Page 16 LZT P4U/P4S (Standard for SE / HE versions) 3.3.7 Electronic expansion valve (VTEE) 3.3.8 Electronic soft starter (DSSE) 3.3.9 Remote control panel (PCRL) 3.3.10 Hydraulic circuit antifreeze kit (KP) 3.3.11 Hydraulic kit with one pump without tank - user circuit (A1NTU) 3.3.12 Hydraulic kit with one pump without tank - recovery circuit (A1NTR) 3.3.13 Hydraulic kit with two pumps without tank - user circuit (A2NTU) 3.3.14 Hydraulic kit with two pumps without tank - recovery circuit (A2NTR)
  • Page 17 LZT P4U/P4S 3.4 What is the E.V.I. technology (enhanced vapour injection) m +i Pm+i Water production at 40°C Water production at 40°C C.O.P. Water production at 55°C Water production at 55°C Ambient temperature (°C) Max Water Temperature (°C) Ambient temperature (°C) MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev.
  • Page 18 LZT P4U/P4S 3.5 Technical data SA/LS/RV - P4S/P4U SE/LS/RV - P4S/P4U R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 1002 1202 1454 1654 1854 2154 SA/LS/RV - P4S/P4U 1002 1202 1454 1654 1854 2154 SE/LS/RV - P4S/P4U R410A R410A...
  • Page 19 LZT P4U/P4S HA/LS/RV - P4S/P4U HE/LS/RV - P4S/P4U R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 1002 1202 1454 1654 1854 2154 HA/LS/RV - P4S/P4U 1002 1202 1454 1654 1854 2154 HE/LS/RV - P4S/P4U R410A R410A R410A...
  • Page 20 LZT P4U/P4S HA/XL/RV - P4S/P4U HE/XL/RV - P4S/P4U R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 1002 1202 1454 1654 1854 2154 HA/XL/RV - P4S/P4U 1002 1202 1454 1654 1854 2154 HE/XL/RV - P4S/P4U R410A R410A R410A...
  • Page 21 LZT P4U/P4S HE/NN/RV - P4S/P4U R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 1002 1202 1454 1654 1854 2154 HE/NN/RV - P4S/P4U R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 on the unit. MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev.
  • Page 22 LZT P4U/P4S 3.6 Operation limits - 20 - 10 3.6.2 User hot water temperature (Winter operation) the unit. 3.6.3 Cold water temperature (RV versions Only) 3.6.4 Ambient air temperature MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 23 LZT P4U/P4S MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 24 LZT P4U/P4S 3.7 Domestic hot water production 3.7.1 Solution MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 25 LZT P4U/P4S 3.8 Compressor capacity steps NUMBER of COMPRESSORS Model 242/252 292/302 1002 1202 1454 1654 1854 2154 3.9 Correction tables 3.9.1 Operation with glycol Glycol percentage Freezing point (°C) IPCF WFCF PDCF -3.2 0.985 1.02 1.08 -7.8 0.98 0.99 1.05 1.12 -14.1...
  • Page 26 LZT P4U/P4S 3.10 Sound data SA / LS Octave bands (Hz) Mod. dB(A) dB(A) SE / LS MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 27 LZT P4U/P4S HA / LS Mod. dB(A) dB(A) HE / LS MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 28 LZT P4U/P4S HA / XL Octave bands (Hz) Mod. dB(A) dB(A) HE/ XL MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 29 LZT P4U/P4S HE / NN Octave bands (Hz) Mod. dB(A) dB(A) MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 30 LZT P4U/P4S 4. INSTALLATION 4.1 General safety guidelines and and use of symbols tion. 4.2 Health and safety Considerations 4.3 Personal protective equipment MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 31 LZT P4U/P4S High efficiency air to water heat pumps with E.V.I. compressors 4.4 Inspection When installing or servicing the unit, it is necessary to strictly follow the rules reported on this manual, to conform to all the specifications of the labels on the unit, and to take any possible precautions of the case. Not observing the rules reported on this manual can create dangerous situations.
  • Page 32 LZT P4U/P4S 4.7 Lifting and handling 4.8 Location and minimum technical clearances MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 33 LZT P4U/P4S High efficiency air to water heat pumps with E.V.I. compressors SA-SE 242 - 292 SA/SE 432 - 492 - 592 SA/SE 752 - 852 HA-HE/XL 252 - 302 HA-HE/LS 242 - 292 HA-HE/LS-XL 432 - 492 HA-HE/LS-XL 592 - 602 - 752 - 852 HA-HE/NN 252 - 312 HA-HE/NN 312 1002 - 1202...
  • Page 34 LZT P4U/P4S High efficiency air to water heat pumps with E.V.I. compressors SA/SE 1002-1202 HA-HE/LS 1454 - 1654 SA-SE/LS 1454 - 1654 HA-HE/XL 1454 - 1654 - 1854 - 2154 HE/NN 1454 - 1654 - 1854 - 2154 HE/NN 1002-1202 1854 - 2154 1854 - 2154 1002...
  • Page 35 LZT P4U/P4S 4.9 Installation of rubber vibration dampers (KAVG) sez A - A ØM ØD ØE Mod. 242÷312 432÷602 752÷1202 1454÷2154 4.10 Serial interface card RS485 (INSE) Supervision MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 36 LZT P4U/P4S 4.11 Installation of condensate drip tray (BRCA) 4.11.1 Installation of the heating cable MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 37 LZT P4U/P4S 4.12 Hydraulic connections • • • • • • Heating mode: Cooling mode: 4.13 Chemical characteristics of the water Total Hardness Electric conductibility Sulphur ion None Chlorine ions Ammonia ion None Sulphuric acid ions Silicon ion Total Iron MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev.
  • Page 38 LZT P4U/P4S 4.14 Hydraulic components 4.14.1 P2S Versions P2U Versions User Circuit 4.14.2 P4S Versions P4U Versions 4.14.3 P2S Versions + A1NTU/A2NTU P2U Versions + A1NTU/A2NTU User Circuit MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 39 LZT P4U/P4S 4.14.4 P4S Versions + A2NTR + A2ZZU P4U Versions + A2NTR + A2ZZU 4.14.5 P4S Versions + A2NTR + A2NTU P4U Versions + A2NTR + A2NTU MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 40 LZT P4U/P4S 4.15 User circuit minimum water content Model Minimum water content winter mode (l) Model 1002 1202 1454 1654 1854 2154 Minimum water content winter mode (l) 1025 1050 4.16 Minimum domestic hot water circuit content Model Minimum water content hydraulic circuit (l) Model 1002 1202 1454 1654 1854 2154 Minimum water content hydraulic circuit (l)
  • Page 41 LZT P4U/P4S 4.19 Typical installations 4.19.1 Combined heating / Cooling / Domestic hot water production – 4 pipe system P4S User circuit sensor The plant components supplied by the company are: STANDARD OPTIONS NOT AVAILABLE User circuit sensor MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev.
  • Page 42 LZT P4U/P4S 4.19.2 Combined heating / Cooling production – 4 pipe system P4U The system components are provided : STANDARD OPTIONS NOT AVAILABLE MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 43 LZT P4U/P4S 4.20 Electric connections: preliminary safety information FROST PROTECTION MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 44 LZT P4U/P4S 4.21 Electric data 4.21.1 Electric data LS / XL models Models LS / XL 242/252 292/302 Power supply Control board Auxiliary circuit Fans power supply Line section PE section 1002 1202 1454 1654 1854 2154 Models LS / XL Power supply Control board Auxiliary circuit...
  • Page 45 LZT P4U/P4S 4.22 Electric connections 4.22.1 Power supply and electrical connections 4.22.2 Remote wiring connections (compulsory) USER CIRCUIT WATER INLET SENSOR (BTI) USER CIRCUIT WATER PUMP DOMESTIC HOT WATER SENSOR (BTS) MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 46 LZT P4U/P4S DOMESTIC HOT WATER CIRCUIT PUMP 4.22.3 Remote wiring connections (optional) REMOTE ON / OFF REMOTE SUMMER / WINTER CHANGE OVER REMOTE GENERAL ALARM 90-91-92. DOMESTIC HOT WATER CIRCUIT FLOW SWITCH PRIORITY SELECTOR (Hot water) MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev.
  • Page 47 LZT P4U/P4S M .252 ÷ 432 HEATING CABLE M .492 ÷ 2154 WEATHER COMPENSATED SENSOR (BTE) USER CIRCUIT WATER OUTLET SENSOR (BTO) DOMESTIC HOT WATER OUTLET SENSOR (BTU) USER CIRCUIT FLOW SWITCH (SFW1) MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev.
  • Page 48 LZT P4U/P4S 4.23 Positioning of the user circuit water inlet sensor (BTI) Correct positioning of the BTI sensor Incorrect positioning of the BTI sensor 4.24 Positioning of the domestic hot water circuit sensor (BTS) Correct positioning of the BTS sensor Incorrect positioning of the BTS sensor MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev.
  • Page 49 LZT P4U/P4S 4.25 Refrigerant circuit layout P4S Version EXV 2 EXV 1 EXV 4 MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 50 LZT P4U/P4S P4U Version YDEF YTUT1 YTUT BTI VR YTSO YDEF1 YDEF YDEF1 YTSO YTUT connections MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 51 LZT P4U/P4S P4S Version EXV 2 EXV 3 EXV 1 EXV 4 MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 52 LZT P4U/P4S P4U Version YDEF YTUT1 YTUT BTI VR YTSO YDEF1 YDEF YDEF1 YTSO YTUT MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...

  • Page 53: Unit Start Up

    LZT P4U/P4S 5. UNIT START UP 5.1 Preliminary checks 5.1.1 Before start-up • • • • • • • • • • • • • MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 54 LZT P4U/P4S 5.1.2 Device Set-point Differential Reset Device Set-point Differential Reset ----- ----- ----- support. 5.1.3 Controls during unit operation • • • MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 55 LZT P4U/P4S 5.2 Position of the control panel Unit ON: Heating Unit ON: Heating 00:00 01/01/2014 Evaporator inlet temperature 30.0 °C Evaporator outlet temperature 35.0 °C External air temp. (FC) °C San. water temperature 50.0 °C PROBES ALARM SERVICE CIRC. 5.2.1 Display icons Icon Meaning...
  • Page 56 LZT P4U/P4S 5.2.2 Key function PROBES ALARM SERVICE CIRC Stand-by Stand-by 00:00 01/01/2014 Evaporator inlet temperature 30.0 °C °C Evaporator outlet temperature 35.0 °C External air temp. (FC) San. water temperature 50.0 °C PROBES ALARM SERVICE CIRC. MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev.
  • Page 57 LZT P4U/P4S 5.3.1 Remote keyboard connection ENTER ENTER • • 5.3.3 Wall mounting connection diagram MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...

  • Page 58: Use

    LZT P4U/P4S 6. USE 6.1 Switch the unit on Unit 6.1.1 Switch the unit on from the keyboard Cooling mode Heating mode Domestic hot water mode MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...

  • Page 59: Stop

    LZT P4U/P4S 6.1.2 Heating and cooling mode Unit ON: Heating Unit ON: Heating Unit ON: Cooling Unit ON: Cooling 00:00 01/01/2014 00:00 01/01/2014 Evaporator inlet temperature Evaporator inlet temperature 28.4 °C 20.2 °C Evaporator outlet temperature Evaporator outlet temperature 27.0 °C 63.6 °C...
  • Page 60 LZT P4U/P4S 6.3 Set point SET. Set point Set point Stand-by Stand-by 00:00 01/01/2014 Energy saving Evaporator inlet temperature 30.0 °C Dynamic set Heating 35.0 °C Evaporator outlet temperature °C 35.0 Sanitary water 50.0 °C External air temp. (FC) °C 35.0 °C HP real set San.
  • Page 61 LZT P4U/P4S 6.4 PROBES key PROBES Probes visualization Probes visualization Stand-by Stand-by 00:00 01/01/2014 Evaporator inlet temperature Evaporator inlet temperature 28.4 °C 58.8 °C Evaporator outlet temperature °C Evaporator outlet temperature 27.0 25.7 °C San. water temperature External air temp. (FC) °C °C 31.8...

  • Page 62: Circ

    LZT P4U/P4S • Reset: RESET • Password • Active RST ALL 6.6 CIRC key CIRC State of the compressors Color black: Color white: level of step control. Unit ON: Heating Unit ON: Heating 00:00 01/01/2014 Evaporator inlet temperature 28.4 °C Evaporator outlet temperature 27.0 °C...
  • Page 63 LZT P4U/P4S Evaporator pump status Evaporator pump status Fan speed regulation Fan speed regulation Evap. pump 1 Evap. pump 1 Cond.Fan1: Cond.Fan1: 100% 100% ALARM ALARM 6.7 SERVICE key Service Service Unit ON: Heating Unit ON: Heating 00:00 01/01/2014 1st Level Pass 28.4 °C Evaporator inlet temperature...
  • Page 64 LZT P4U/P4S ALARM ENTER ALARM ENTER Press the SERVICE ENTER MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 65 LZT P4U/P4S 6.7.1 Service parameters setting ENTER. ENTER Code Meaning Code Meaning Parameter programming Parameter programming St: Set-point St: Set-point 1st level 1st level Chiller set point ALARM ENTER ALARM SP: Setup SP: Setup Parameter programming Parameter programming 1st level 1st level SP14 Serial address...
  • Page 66 LZT P4U/P4S Sd: Dynamic set point Sd: Dynamic set point Parameter programming Parameter programming Sd01 °C 1st level 1st level Sd02 10.0 °C Sd03 °C Sd04 20.0 °C Max increase in chiller dynamic set ALARM ALARM ENTER Weather compensated function Heating mode MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev.
  • Page 67 LZT P4U/P4S Cooling mode Parameter programming Parameter programming ES: Energy saving ES: Energy saving 1st level 1st level 00:00 00:00 00:00 00:00 Start of work time band 1 ALARM ENTER ALARM Parameter programming Parameter programming FS02 1st level 1st level FS03 45.0 °C...
  • Page 68 LZT P4U/P4S 6.7.2 Setting date and time SET. Press to set the Start Start Stop Stop : 07 Clock setting Clock setting 00:00 00:00 00:00 00:00 Time band n°1 Time band n°1 05 / 7 / 14 Data setting Data setting 00:00 00:00 00:00...
  • Page 69 LZT P4U/P4S 6.7.4 Water pumps SET. RESET HOURS Water pumps Water pumps Hour Evaporator water pump RESET ENB/DIS HOURS 6.7.5 Alarms SET. Alarms Alarms Active Clock alarm ESC RST ALL RESET 6.7.6 Alarm log SET. RST ALL 2/10 Alarm log Alarm log b1HP b1HP...
  • Page 70 LZT P4U/P4S 6.7.7 Defrost SET. ENTER Defrost status Defrost status Circuit 1 Circuit 1 cycle not in progress cycle not in progress 45 : 0 Time to start (mm:ss) ALARM ENTER Press Defrost circ. 1: Defrost circ. 1: cycle not in progress Defrost circ.
  • Page 71 LZT P4U/P4S 6.7.9 I/O Status (Input/Output) SET. I/O Status I/O Status Analog input Analog output Digital input Digital output ALARM ENTER 6.7.10 Auxiliary output SET. Auxiliary output status Auxiliary output status 51.3 °C External air temp.: 17.6 °C San.water sec. t.: ALARM 6.7.11 Sanitary water SET.
  • Page 72 LZT P4U/P4S 7. MAINTENANCE OF THE UNIT 7.1 General warnings • • • 7.2 Drive access MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 73 LZT P4U/P4S 7.3 5.1. Scheduled maintenance Search for leaks CASE Visual Inspection Pressure Test 7.4 Periodical checks MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 74 LZT P4U/P4S 7.4.1 Electrical system and adjustment Frequency Action to be performed As neces- 7.4.2 Condensing coils and fans Frequency Action to be performed As neces- present every three months or more MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev.
  • Page 75 LZT P4U/P4S 7.4.3 Compressors Frequency Action to be performed As neces- service. 7.4 Refrigerant circuit repair Therefore: • • • • • • MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...

  • Page 76: Decommissioning

    LZT P4U/P4S 8. DECOMMISSIONING 8.1 Disconnect the unit • • • • • 8.2 Disposal, recovery and recycling 8.3 RAEE Directive (only UE) MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 77 LZT P4U/P4S 9. DIAGNOSIS AND TROUBLESHOOTING Unit alarms Code Visualization Alarm Description Cause Solution ACF1..ACF19 AEFL ACFL AEUn AHFL AP1...AP10 nection of the sensor to the AP11...AP20 sensor. AP21...AP27 AtC1 AtC1 MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev.
  • Page 78 LZT P4U/P4S AtE1 AtE2 AEht AEM1 AEM2 AFFC Atrb ALc1 ALc2 Probe fault tions. MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 79 LZT P4U/P4S Circuit alarms Code Visualization Alarm Description Cause Solution Restore the correct user B(n)HP b(n)AC b(n)AH stet point. b(n)dF Restore the correct user b(n)hP B(n)LP b(n)lP b(n)tF b(n)Cu MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 80 LZT P4U/P4S Compressors alarms Code Visualization Alarm Description Cause Solution C(n)tr C(n)oP C(n)dt Other alarms Visualization Alarm Description Cause Solution Termostatic expansion valves AL! Flowmeter transd. MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 81 LZT P4U/P4S MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 82 LZT P4U/P4S MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 83 LZT P4U/P4S MTEC.5006.GB-B-1 Operation and maintenance manual LZT series English Rev. B 11-2022...
  • Page 84 HIDROS Srl...

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