HIdRos LHA P4U Series Technical Manual
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HIdRos LHA P4U Series Technical Manual

4 pipe systems high efficiency air to water heat pumps
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4 PIPE SYSTEMS HIGH EFFICIENCY AIR TO WATER HEAT PUMPS
LHA P4U/P4S
SERIES
TECHNICAL MANUAL
Multiple instructions:
the instructions before
the unit
Rev. G 10-2021

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Summary of Contents for HIdRos LHA P4U Series

  • Page 1 4 PIPE SYSTEMS HIGH EFFICIENCY AIR TO WATER HEAT PUMPS LHA P4U/P4S SERIES TECHNICAL MANUAL Multiple instructions: the instructions before the unit Rev. G 10-2021...
  • Page 2 LHA P4U/P4S Declaration of conformity MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...

  • Page 3: Table Of Contents

    LHA P4U/P4S INDEX 1. INTRODUCTION ..............................................................................................................................................................................................................................................................................................................................................2. SAFETY ..................................................................................................................................................................................................................................................3.2 Other versions ............................................................................................................................................................3.7 C ............................... 3.8 C ................................
  • Page 4 LHA P4U/P4S ....................................................................................................................6. USE ........................................................................6.2 Stop .................................................................................................................................... 6.6 CIRC ................................................................................................... 7. UNIT MAINTENANCE .................................................................... 7.2 Access to the unit ............................................................................................................................8. DECOMMISSIONING ....................................................................................................................

  • Page 5: Introduction

    LHA 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.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 6 LHA 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.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 7 LHA P4U/P4S 1.7 General Description of Symbols Used BANNED WARNING ACTION REQUIRED MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 8 LHA 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.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 9 LHA P4U/P4S +39 049 9731022 MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...

  • Page 10: Safety

    LHA P4U/P4S 2. SAFETY 2.1 Warning re potentially hazardous toxic substances • • ENVIRONMENTAL PROTECTION : 2.1.3 Persistence and degradation 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.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 11 LHA 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 LHA 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 User and recovery circuit heat exchangers protection. 3.1.6 Fans 3.1.7 Microprocessors MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...

  • Page 13: Other Versions

    LHA P4U/P4S 3.1.8 Electric enclosure 3.1.9 Control and protection devices 3.3.11 Fan speed control (DCCF) This 3.2 Other versions 3.2.1 Version RV 3.2.2 SA Version 3.2.3 SE Version 3.2.4 HA Version 3.2.5 HE Version 3.2.6 Version LS 3.2.7 HA/XL HE/XL Super low noise version MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 14 LHA P4U/P4S 3.2.8 P4U version 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 3.2.9 P4S Version MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 15 LHA 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: 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 Antifreeze kit (RAEV2, RAEV4) 3.3.3 Rubber vibration dampers (KAVG) 3.3.4 RS485 serial interface card modbus protocol (INSE)
  • Page 16 LHA P4U/P4S 3.3.6 Electronic expansion valve (VTEE) 3.3.7 Electronic soft starter (DSSE) 3.3.8 Remote control panel (PCRL) 3.3.9 Hydraulic circuit antifreeze kit (KP) 3.3.10 Integrated hydraulic kit 1 pump + Water tank (A1ZZU) 3.3.11 Integrated hydraulic kit 2 pumps + Water tank (A2ZZU) 3.3.12 Hydraulic kit with one pump without tank - user circuit (A1NTU) 3.3.13 Hydraulic kit with one pump without tank - recovery circuit (A1NTR) 3.3.14 Hydraulic kit with two pumps without tank - user circuit (A2NTU)
  • Page 17 LHA P4U/P4S 3.3.18 Accessories availability LHA SA-SE/HH-RV LHA HA-HE/HH-RV 252 302 402 412 432 492 592 602 702 802 902 1002 1202 1402 – – – – – – – – – – – – – – – – – –...
  • Page 18 LHA P4U/P4S 3.4 Technical data SA/LS/RV - P4S 1002 1202 1402 SCOP SE/LS/RV - P4S 1002 1202 1402 SCOP R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088...
  • Page 19 LHA P4U/P4S SA/LS/RV - P4U 1002 1202 1402 SCOP SE/LS/RV - P4U 1002 1202 1402 SCOP R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 SA/LS/RV - P4U 1602 1802...
  • Page 20 LHA P4U/P4S HA/LS/RV - P4S 1002 1202 1402 SCOP HE/LS/RV - P4S 1002 1202 1402 SCOP R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 HA/LS/RV - P4S 1602 1802...
  • Page 21 LHA P4U/P4S HA/LS/RV - P4U 1002 1202 1402 SCOP HE/LS/RV - P4U 1002 1202 1402 SCOP R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 HA/LS/RV - P4U 1602 1802...
  • Page 22 LHA P4U/P4S HA/XL/RV - P4S 1002 1202 1402 SCOP HE/XL/RV - P4S 1002 1202 1402 SCOP R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 HA/XL/RV - P4S 1602 1802...
  • Page 23 LHA P4U/P4S HA/XL/RV - P4U 1002 1202 1402 SCOP HE/XL/RV - P4U 1002 1202 1402 SCOP R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 2088 HA/XL/RV - P4U 1602 1802...
  • Page 24 LHA P4U/P4S 3.5 Operation limits (SA/SE versions) (HA/HE versions) (RV versions Only) - 20 - 10 3.5.2 User hot water temperature (Winter operation) 3.5.3 Cold water temperature (RV versions Only) 3.5.4 Ambient air temperature MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 25 LHA P4U/P4S MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 26 LHA P4U/P4S 3.6 Domestic hot water production (only for P4S version) 3.6.1 Solution MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 27 LHA P4U/P4S 3.7 Compressor capacity steps NUMBER OF COMPRESSORS Modello … … … … … … … … … … … … … … … … … … … … … … 1002 … … 1202 … … 1402 … …...
  • Page 28 LHA P4U/P4S 3.8 Correction tables 3.8.1 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 0.97 0.98 1.09 1.22 -22.3 0.965 0.97 1.14 1.25 -33.8 0.955 0.965 1.33 CCF: Capacity correction factor IPCF: Input power correction factor Water temperature diff.(°C)
  • Page 29 LHA P4U/P4S 3.9 Sound data SA / LS Octave bands (Hz) Mod. dB(A) dB(A) SE / LS MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 30 LHA P4U/P4S HA / LS Octave bands (Hz) Mod. dB(A) dB(A) HE / LS MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 31 LHA P4U/P4S HA / XL Octave bands (Hz) Mod. dB(A) dB(A) HE/ XL MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 32 LHA 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.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...

  • Page 33: Inspection

    LHA P4U/P4S 4.4 Inspection In Case of Damage 4.5 Storage 4.5.1 Shipment 4.6 Unpacking 4.7 Lifting and handling MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 34 LHA P4U/P4S 4.8 Location and minimum technical clearances SA/SE 252 - 302 - 402 SA/SE 432 - 492 - 592 SA/SE 702 - 802 - 902 HA/HE 252 - 302 HA/HE 412 - 432 - 492 HA/HE 602 - 702 - 802 - 902 - 1002 - 1202 A (mm) SA-SE/LS 1500...
  • Page 35 LHA P4U/P4S SA/SE 1002 - 1202 - 1402 - 1602 SA/SE 1802 - 2002 SA/SE 2302 - 2502 HA/HE 1402 - 1602 - 1802 - 2002 HA/HE 2302 - 2502 1002 1202 1402 1602 1802 2002 2302 A (mm) SA-SE/LS 1880 1880 1880...
  • Page 36 LHA P4U/P4S SA/SE 2504 - 3004 - 3204 SA/SE 3504 - 4004 SA/SE 4504 - 5004 HA/HE 2504 - 3004 - 3204 - 3504 HA/HE 4004 - 4504 - 5004 2502 2504 3004 3204 3504 4004 4504 5004 A (mm) SA-SE/LS 2310 2305...
  • Page 37 LHA P4U/P4S 4.9 Installation of rubber vibration dampers (KAVG) sez A - A ØM ØD ØE Mod. LHA 252÷302 LHA 402÷602 LHA 702÷2002 LHA 2504÷5004 4.10 Serial interface card RS485 (INSE) Supervision MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 38 LHA P4U/P4S 4.11 Installation of condensate drip tray (BRCA) 4.11.1 Installation of the heating cable MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 39 LHA 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.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 40 LHA P4U/P4S 4.14 Hydraulic components 4.14.1 P4S Versions P4U Versions 4.14.2 P4S Versions + A2NTR + A2ZZU P4U Versions + A2NTR + A2ZZU 4.14.3 P4S Versions + A2NTR + A2NTU P4U Versions + A2NTR + A2NTU MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 41 LHA P4U/P4S 4.15 User circuit minimum water content Model 252 302 402 412 432 492 592 602 702 802 902 1002 1202 1402 Minimum water content winter mode (l) 240 340 400 400 480 560 650 650 750 820 1000 1120 1240 1440 Model 1602 1802 2002 2302 2502 2504 3004 3204 3504 4004 4504 5004 Minimum water content winter mode (l)
  • Page 42 LHA 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.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 43 LHA P4U/P4S 4.19.2 Combined heating / Cooling production – 4 pipe system P4U The system components are provided : STANDARD OPTIONS NOT AVAILABLE MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 44 LHA P4U/P4S 4.20 Electric connections: preliminary safety information FROST PROTECTION MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 45 LHA P4U/P4S 4.21 Electric data Model 402/412 Power supply Control board Auxiliary circuit Fans power supply Line section PE section Model 1002 1202 1402 1602 1802 2002 2302 Power supply Control board Auxiliary circuit Fans power supply Line section PE section Model 2502 2504...
  • Page 46 LHA 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 use. DOMESTIC HOT WATER SENSOR (BTS) MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 47 LHA 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 (P4 versions only) USER CIRCUIT ELECTRIC INTEGRATION HEATERS MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 48 LHA P4U/P4S DOMESTIC HOT WATER ELECTRIC INTEGRATION HEATERS PRIORITY SELECTOR (Hot water) WEATHER COMPENSATED SENSOR (BTE) USER CIRCUIT WATER OUTLET SENSOR (BTO) DOMESTIC HOT WATER OUTLET SENSOR (BTU) USER CIRCUIT FLOW SWITCH (SFW1) MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 49 LHA 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.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 50 LHA P4U/P4S 4.25 Refrigerant circuit layout P4S Version EXV 2 EXV 1 MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 51 LHA P4U/P4S P4U Version YDEF YTUT1 YTUT BTI VR YTSO YDEF1 YDEF YDEF1 YTSO YTUT connections MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 52 LHA P4U/P4S P4S Version EXV 2 EXV 3 EXV 1 MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 53 LHA P4U/P4S P4U Version YDEF YTUT1 YTUT BTI VR YTSO YDEF1 YDEF YDEF1 YTSO YTUT MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...

  • Page 54: Unit Start Up

    LHA P4U/P4S 5. UNIT START UP 5.1 Preliminary checks 5.1.1 Before start-up • • • • • • • • • • • • • MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 55 LHA P4U/P4S 5.1.2 Device Set-point Differential Reset Device Set-point Differential Reset ----- ----- ----- support. 5.1.3 Controls during unit operation • • • MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 56 LHA P4U/P4S 5.2 Position of the control panel 5.3 Description 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...
  • Page 57 LHA P4U/P4S 5.3.2 Key function PROBES ALARM SERVICE CIRC Stand-by Stand-by 00:00 01/01/2014 Evaporator inlet temperature 30.0 °C Evaporator outlet temperature °C 35.0 External air temp. (FC) °C San. water temperature 50.0 °C PROBES ALARM SERVICE CIRC. MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 58 LHA P4U/P4S 5.4 Remote keyboard connection ENTER ENTER • • 5.4.1 Wall mounting connection diagram MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...

  • Page 59: Use

    LHA 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.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...

  • Page 60: Stop

    LHA 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 61 LHA 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 35.0 °C Sanitary water 50.0 °C External air temp. (FC) °C 35.0 °C HP real set San.
  • Page 62 LHA P4U/P4S 6.4 PROBES key PROBES Probes visualization Probes visualization Stand-by Stand-by 00:00 01/01/2014 Evaporator inlet temperature 58.8 °C Evaporator inlet temperature 28.4 °C Evaporator outlet temperature °C 25.7 °C Evaporator outlet temperature 27.0 San. water temperature °C External air temp. (FC) °C 47.6 31.8...

  • Page 63: Circ

    LHA P4U/P4S • 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 External air temp.
  • Page 64 LHA 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 65 LHA P4U/P4S ALARM ENTER ALARM ENTER Press the ENTER ENTER MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 66 LHA P4U/P4S 6.7.1 Service parameters setting SET. 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 Serial address...
  • Page 67 LHA 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 Press T4 Weather compensated function MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 68 LHA P4U/P4S 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 FS04 °C...
  • Page 69 LHA P4U/P4S 6.7.2 Setting date and time SET. Press T4 T5 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 70 LHA 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 71 LHA 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 72 LHA 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 73: Unit Maintenance

    LHA P4U/P4S 7. MAINTENANCE OF THE UNIT 7.1 General warnings • • • 7.2 Drive access MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 74 LHA P4U/P4S 7.3 Scheduled maintenance Search for leaks CASE Visual Inspection Pressure Test 7.4 Periodical and start up checks MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 75 LHA 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.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 76 LHA P4U/P4S 7.4.3 Compressors Frequency Action to be performed As neces- service. MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...

  • Page 77: Decommissioning

    LHA P4U/P4S 7.5 Refrigerant circuit repair Therefore: • • • • • • 8. DECOMMISSIONING 8.1 Disconnect the unit • • • • • 8.2 Disposal, recovery and recycling MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 78 LHA P4U/P4S 8.3 RAEE Directive (only UE) 9. DIAGNOSIS AND TROUBLESHOOTING Unit alarms Code Visualization Alarm Description Cause Solution ACF1..ACF19 AEFL ACFL AEUn AHFL MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 79 LHA P4U/P4S AP1...AP10 nection of the sensor to the AP11...AP20 sensor. AP21...AP27 AtC1 AtC1 AtE1 AtE2 AEht AEM1 AEM2 AFFC Atrb ALc1 ALc2 nection of the sensor to the Probe fault sensor MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev.
  • Page 80 LHA 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.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 81 LHA 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.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 82 LHA P4U/P4S MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...
  • Page 83 LHA P4U/P4S MTEC.4005.GB-G-1 Operation and maintenance manual LHA series English Rev. G 10-2021...

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