A.O. Smith AWHP 4P Series Technical Manual
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A.O. Smith AWHP 4P Series Technical Manual

High efficiency air to water heat pumps with e.v.i. compressors
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HIGH EFFICIENCY AIR TO WATER HEAT PUMPS
HIGH EFFICIENCY AIR TO WATER HEAT PUMPS
WITH E.V.I. COMPRESSORS
WITH E.V.I. COMPRESSORS
LZT P4U/P4S
AWHP 4P
TECHNICAL MANUAL
Multiple instructions:
SERIES
SERIES
Rev. D 10-2023
Rev. D 10-2023
the instructions before
the unit

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  • Page 1 HIGH EFFICIENCY AIR TO WATER HEAT PUMPS HIGH EFFICIENCY AIR TO WATER HEAT PUMPS WITH E.V.I. COMPRESSORS WITH E.V.I. COMPRESSORS LZT P4U/P4S AWHP 4P SERIES SERIES TECHNICAL MANUAL Multiple instructions: the instructions before the unit Rev. D 10-2023 Rev. D 10-2023...
  • Page 2 LZT P4U/P4S AWHP 4P Declaration of conformity MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 3 LZT P4U/P4S AWHP 4P INDEX INDEX 1. INTRODUCTION..................................... 1. INTRODUCTION......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 2. SAFETY ......................................... 2. SAFETY ....................................................................................................................................................................

  • Page 4: Table Of Contents

    LZT P4U/P4S AWHP 4P ............................................................................................................................6. USE ....................................................................... 6.2 Stop .................................................................................................................................... 6.6 CIRC ................................................................................................... 7. UNIT MAINTENANCE .................................................................... 7.2 Access to the unit............................................................................................................................8. DECOMMISSIONING....................................................................................................................
  • Page 5 LZT P4U/P4S AWHP 4P 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-D-1 Operation and maintenance manual LZT series English 5006 Rev.
  • Page 6 LZT P4U/P4S AWHP 4P 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-D-1 Operation and maintenance manual LZT series English 5006 Rev.
  • Page 7 LZT P4U/P4S AWHP 4P 1.7 General Description of Symbols Used BANNED WARNING ACTION REQUIRED MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 8 LZT P4U/P4S AWHP 4P 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-D-1 Operation and maintenance manual LZT series English 5006 Rev.
  • Page 9 LZT P4U/P4S AWHP 4P Manufacturer: PD322111 123456 1LZT.0302.NNRV U-1A AWHP 185 SE/LN 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 AWHP 4P 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-D-1 Operation and maintenance manual LZT series English 5006 Rev.
  • Page 11 LZT P4U/P4S AWHP 4P 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...
  • Page 12 LZT P4U/P4S AWHP 4P 3. TECHNICAL CHARACTERISTICS 3.1 Unit description 3.1 Unit description 3.1.1 Frame 3.1.1 Frame 3.1.2 Refrigerant circuit 3.1.2 Refrigerant circuit 3.1.3 Compressors 3.1.3 Compressors 3.1.4 Source heat exchanger 3.1.4 Source heat exchanger 3.1.5 Fans 3.1.5 Fans 3.1.6 User heat exchangers 3.1.6 User heat exchangers protection.
  • Page 13 LZT P4U/P4S AWHP 4P 3.1.7 Electric enclosure 3.1.7 Electric enclosure 3.1.8 Microprocessors 3.1.8 Microprocessors 3.1.9 Control and protection devices 3.1.9 Control and protection devices 3.2 Other versions 3.2 Other versions 3.2.1 SA Version 3.2.1 SE Version 3.2.2 SE Version 3.2.2 SE/ACF Version 3.2.3 HA Version 3.2.3 ACF Version 3.2.4 HE Version...
  • Page 14 LZT P4U/P4S AWHP 4P 3.2.7 Version P4U 3.2.7 Version 4P 1. User water heating: 1. User water heating: 2. User water cooling: 2. User water cooling: 3. Simultaneous user Cooling + heating: 3. Simultaneous user Cooling + heating: P4U Version 4P Version 7°C 7°C...
  • Page 15 LZT P4U/P4S AWHP 4P 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 4P+D.H.W. 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 Accessories description 3.3.1 Condensate discharge drip tray with antifreeze heater (BRCA) 3.3.1 Condensate discharge drip tray with antifreeze heater...
  • Page 16 LZT P4U/P4S AWHP 4P (Standard for SE/ACF / Standard versions) (Standard for SE / HE versions) 3.3.7 Electronic expansion valve 3.3.7 Electronic expansion valve (VTEE) 3.3.8 Electronic soft starter 3.3.8 Electronic soft starter (DSSE) 3.3.9 Remote control panel 3.3.9 Remote control panel (PCRL) 3.3.10 Hydraulic circuit antifreeze kit 3.3.10 Hydraulic circuit antifreeze kit (KP) 3.3.11 Hydraulic kit with one pump without tank - user circuit...
  • Page 17 LZT P4U/P4S AWHP 4P 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-D-1 Operation and maintenance manual LZT series English 5006...
  • Page 18 LZT P4U/P4S AWHP 4P 3.5 Technical data SA/LS/RV - P4S/P4U SE/LN/RV 24 LN 30 LN SE/LS/RV - P4S/P4U SE/ACF/LN/RV 24 LN 30 LN R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 SA/LS/RV - P4S/P4U SA/LS/RV - P4S/P4U 1002 1202...
  • Page 19 LZT P4U/P4S AWHP 4P HA/LS/RV - P4S/P4U ACF/LN/RV 24 LN 30 LN HE/LS/RV - P4S/P4U LN/RV 24 LN 30 LN R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 HA/LS/RV - P4S/P4U ACF/LN/RV 1002 1202 1454 1654 1854...
  • Page 20 LZT P4U/P4S AWHP 4P HA/XL/RV - P4S/P4U ACF/SLN/RV SLN/RV HE/XL/RV - P4S/P4U R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 HA/XL/RV - P4S/P4U ACF/SLN/RV 1002 1202 1454 1654 1854 2154 HE/XL/RV - P4S/P4U SLN/RV 1002 1202 1454...
  • Page 21 LZT P4U/P4S AWHP 4P HE/NN/RV - P4S/P4U R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 HE/NN/RV - P4S/P4U 1002 1202 1454 1654 1854 2154 R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 on the unit.
  • Page 22 LZT P4U/P4S AWHP 4P 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-D-1 Operation and maintenance manual LZT series English 5006 Rev.
  • Page 23 LZT P4U/P4S AWHP 4P MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 24 LZT P4U/P4S AWHP 4P 3.7 Domestic hot water production 3.7.1 D.H.W. tank management kit MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 25 LZT P4U/P4S AWHP 4P 3.8 Compressor capacity steps NUMBER of COMPRESSORS Model 24 LN/24 242/252 30 LN/30 292/302 1002 1202 1454 1654 1854 2154 3.9 Correction tables 3.9.1 Operation with glycol Glycol percentage Freezing point (°C) IPCF WFCF PDCF CCF: Capacity correction factor IPCF: Input power correction factor Water temperature diff.(°C) CCCP = Cooling capacity correction factor...
  • Page 26 LZT P4U/P4S AWHP 4P 3.10 Sound data SA / LS SE/LN Octave bands (Hz) Mod. dB(A) dB(A) 24 LN 30 LN SE/ACF/LN SE / LS 24 LN 30 LN MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 27 LZT P4U/P4S AWHP 4P ACF/LN HA / LS Mod. dB(A) dB(A) 24 LN 30 LN HE / LS 24 LN 30 LN MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 28 LZT P4U/P4S AWHP 4P ACF/SLN HA / XL Octave bands (Hz) Mod. dB(A) dB(A) HE/ XL MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 29 LZT P4U/P4S AWHP 4P HE / NN Octave bands (Hz) Mod. dB(A) dB(A) MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 30 LZT P4U/P4S AWHP 4P 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-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 31 LZT P4U/P4S AWHP 4P 4.4 Inspection In Case of Damage 4.5 Storage 4.5.1 Shipment 4.6 Unpacking MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 32 LZT P4U/P4S AWHP 4P 4.7 Lifting and handling 4.8 Location and minimum technical clearances MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 33 LZT P4U/P4S AWHP 4P SE/LN-SE/ACF/LN SA-SE 242 - 292 HA-HE/XL 252 - 302 ACF/SLN-SLN 24 - 30 SE/LN-SE/ACF/LN 37 - 49 - 55 SA/SE 432 - 492 - 592 SE/LN-SE/ACF/LN 65 - 80 SA/SE 752 - 852 ACF/LN-LN HA-HE/LS 242 - 292 HA-HE/NN 252 - 312 STD 24 - 35 ACF/LN-LN - ACF/SLN-SLN 37 - 49...
  • Page 34 LZT P4U/P4S AWHP 4P ACF/SLN-SLN SE/LN-SE/ACF/LN 90 - 100 SA/SE 1002-1202 ACF/SLN-SLN 145 - 165 - 185 - 215 HA-HE/LS 1454 - 1654 SE/LN-SE/ACF/LN 145 - 165 - SA-SE/LS 1454 - 1654 HA-HE/XL 1454 - 1654 - 1854 - 2154 145 - 165 - 185 - 215 STD 90 - 100 HE/NN 1002-1202...
  • Page 35 LZT P4U/P4S AWHP 4P 4.9 Installation of rubber vibration dampers (KAVG) 4.9 Installation of rubber vibration dampers sez A - A ØM ØD ØE Mod. Mod. 24 LN ÷35 242÷312 432÷602 37÷60 752÷1202 65÷100 1454÷2154 145÷215 4.10 Serial interface card RS485 (INSE) 4.10 Serial interface card RS485 Supervision Supervision...
  • Page 36 LZT P4U/P4S AWHP 4P 4.11 Installation of condensate drip tray (BRCA) 4.11 Installation of condensate drip tray 4.11.1 Installation of the heating cable MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 37 LZT P4U/P4S AWHP 4P 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-D-1 Operation and maintenance manual LZT series English 5006...
  • Page 38 LZT P4U/P4S AWHP 4P 4.14 Hydraulic components 4.14.1 P2S Versions 4.14.1 2P+DHW Versions P2U Versions 2P Versions User Circuit 4.14.2 P4S Versions 4.14.2 4P+DHW Versions P4U Versions 4P Versions 4.14.3 4P+DHW Versions + Hydraulic kit with one pump without tank - user circuit/ Hydraulic kit with two pumps without tank - user circuit 4.14.3 P2S Versions + A1NTU/A2NTU 2P Versions + Hydraulic kit with one pump without tank - user circuit/ Hydraulic kit with two pumps without tank - user circuit P2U Versions + A1NTU/A2NTU...
  • Page 39 LZT P4U/P4S AWHP 4P 4.14.4 4P+DHW Versions + Hydraulic kit with two pumps without tank - recovery circuit + Integrated hydraulic kit 2 pumps + Water tank 4.14.4 P4S Versions + A2NTR + A2ZZU 4P Versions + Hydraulic kit with two pumps without tank - recovery circuit + Integrated hydraulic kit 2 pumps + Water tank P4U Versions + A2NTR + A2ZZU 4.14.5 P4S Versions + A2NTR + A2NTU 4.14.5 4P+DHW Versions + Hydraulic kit with two pumps without tank - recovery circuit + Hydraulic kit with two pumps without tank - user circuit...
  • Page 40 LZT P4U/P4S AWHP 4P 4.15 User circuit minimum water content Model 24 LN 30 LN 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 24 LN 30 LN...
  • Page 41 LZT P4U/P4S AWHP 4P 4.19 Electric connections: preliminary safety information FROST PROTECTION MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 42 LZT P4U/P4S AWHP 4P 4.20 Electric data 4.20.1 Electric data LN / SLN models 4.20.1 Electric data LS / XL models Models LN / SLN Models LS / XL 24 LN/24 242/252 30 LN/30 292/302 Power supply Control board Auxiliary circuit Fans power supply Line section PE section...
  • Page 43 LZT P4U/P4S AWHP 4P 4.21 Electric connections 4.21.1 Power supply and electrical connections 4.21.2 Remote wiring connections (compulsory) USER CIRCUIT WATER INLET SENSOR (BTI) USER CIRCUIT WATER PUMP DOMESTIC HOT WATER SENSOR (BTS) MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev.
  • Page 44 LZT P4U/P4S AWHP 4P DOMESTIC HOT WATER CIRCUIT PUMP 4.21.3 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-D-1 Operation and maintenance manual LZT series English 5006 Rev.
  • Page 45 LZT P4U/P4S AWHP 4P M .252 ÷ 432 M .30 ÷ 37 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-D-1 Operation and maintenance manual LZT series English 5006 Rev.
  • Page 46 LZT P4U/P4S AWHP 4P 4.22 Positioning of the user circuit water inlet sensor (BTI) Correct positioning of the BTI sensor Incorrect positioning of the BTI sensor 4.23 Positioning of the domestic hot water circuit sensor (BTS) Correct positioning of the BTS sensor Incorrect positioning of the BTS sensor MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006...
  • Page 47 LZT P4U/P4S AWHP 4P 4.24 Refrigerant circuit layout P4S Version 4P+DHW Version EXV 2 EXV 1 EXV 4 1454 - 1654 - 1854 - 2154 145 - 165 - 185 - 215 MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev.
  • Page 48 LZT P4U/P4S AWHP 4P P4U Version 4P Version YDEF YTUT1 YTUT BTI VR YTSO YDEF1 145 - 165 - 185 - 215 1454 - 1654 - 1854 - 2154 YDEF YDEF1 YTSO YTUT connections MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev.
  • Page 49 LZT P4U/P4S AWHP 4P P4S Version 4P+DHW Version EXV 2 EXV 3 EXV 1 EXV 4 MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 50 LZT P4U/P4S AWHP 4P P4U Version 4P Version YDEF YTUT1 YTUT BTI VR YTSO YDEF1 YDEF YDEF1 YTSO YTUT MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 51 LZT P4U/P4S AWHP 4P 5. UNIT START UP 5.1 Preliminary checks 5.1.1 Before start-up • • • • • • • • • • • • • MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 52 LZT P4U/P4S AWHP 4P 5.1.2 Device Set-point Differential Reset Device Set-point Differential Reset ----- ----- ----- support. 5.1.3 Controls during unit operation • • • MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 53 LZT P4U/P4S AWHP 4P 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.
  • Page 54 LZT P4U/P4S AWHP 4P 5.2.2 Key function PROBES ALARM SERVICE CIRC Stand-by Stand-by 00:00 01/01/2014 Evaporator inlet temperature 30.0 °C Evaporator outlet temperature 35.0 °C °C External air temp. (FC) San. water temperature 50.0 °C PROBES ALARM SERVICE CIRC. MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev.
  • Page 55 LZT P4U/P4S AWHP 4P 5.3 Remote keyboard connection ENTER ENTER • • 5.3.1 Wall mounting connection diagram MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...

  • Page 56: Use

    LZT P4U/P4S AWHP 4P 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-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...

  • Page 57: Stop

    LZT P4U/P4S AWHP 4P 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...
  • Page 58 LZT P4U/P4S AWHP 4P 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 35.0 °C Sanitary water 50.0 °C External air temp. (FC) °C 35.0 °C HP real set...
  • Page 59 LZT P4U/P4S AWHP 4P 6.3.2 Change IP address Unit ON: Heating Unit ON: Heating 00:00 01/01/2014 Evaporator inlet temperature 28.4 °C Evaporator outlet temperature °C 27.0 External air temp. (FC) °C 31.8 San. water temperature 47.6 °C PROBES ALARM SERVICE CIRC. Informations Informations Information system...
  • Page 60 LZT P4U/P4S AWHP 4P 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 61: Circ

    LZT P4U/P4S AWHP 4P • 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...
  • Page 62 LZT P4U/P4S AWHP 4P 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...
  • Page 63 LZT P4U/P4S AWHP 4P ALARM ENTER ALARM ENTER SERVICE ENTER MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 64 LZT P4U/P4S AWHP 4P 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 Parameter programming Parameter programming SP: Setup SP: Setup 1st level 1st level SP14...
  • Page 65 LZT P4U/P4S AWHP 4P 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-D-1 Operation and maintenance manual LZT series English 5006...
  • Page 66 LZT P4U/P4S AWHP 4P 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...
  • Page 67 LZT P4U/P4S AWHP 4P 6.7.2 Setting date and time SET. 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...
  • Page 68 LZT P4U/P4S AWHP 4P 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...
  • Page 69 LZT P4U/P4S AWHP 4P 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 Defrost circ. 1: Defrost circ. 1: cycle not in progress Defrost circ.
  • Page 70 LZT P4U/P4S AWHP 4P 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.

  • Page 71: Unit Maintenance

    LZT P4U/P4S AWHP 4P 7. MAINTENANCE OF THE UNIT 7.1 General warnings • • • 7.2 Drive access MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 72 LZT P4U/P4S AWHP 4P 7.3 Planned maintenance Search for leaks CASE Visual Inspection Pressure Test 7.4 Periodical checks MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 73 LZT P4U/P4S AWHP 4P 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-D-1 Operation and maintenance manual LZT series English 5006 Rev.
  • Page 74 LZT P4U/P4S AWHP 4P 7.4.3 Compressors Frequency Action to be performed As neces- service. 7.5 Refrigerant circuit repair Therefore: • • • • • • MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...

  • Page 75: Decommissioning

    LZT P4U/P4S AWHP 4P 8. DECOMMISSIONING 8.1 Disconnect the unit • • • • • 8.2 Disposal, recovery and recycling 8.3 RAEE Directive (only UE) MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 76 LZT P4U/P4S AWHP 4P 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-D-1 Operation and maintenance manual LZT series English 5006 Rev.
  • Page 77 LZT P4U/P4S AWHP 4P AtE1 AtE2 AEht AEM1 AEM2 AFFC Atrb ALc1 ALc2 Probe fault tions. MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 78 LZT P4U/P4S AWHP 4P 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-D-1 Operation and maintenance manual LZT series English 5006 Rev.
  • Page 79 LZT P4U/P4S AWHP 4P 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-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...
  • Page 80 LZT P4U/P4S AWHP 4P MTEC.5006.GB-D-1 Operation and maintenance manual LZT series English 5006 Rev. D 10-2023...

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