HIdRos WZT P4U Series Technical Manual
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HIdRos WZT P4U Series Technical Manual

High efficiencyair to water split system heat pumps with e.v.i. compressors
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HIGH EFFICIENCYAIR TO WATER SPLIT SYSTEM HEAT PUMPS
WITH E.V.I. COMPRESSORS
WZT P4U-P4S
SERIES
TECHNICAL MANUAL
Multiple instructions:
the instructions before
the unit
MTEC.5115
Rev. B 02-2020

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  • Page 1 HIGH EFFICIENCYAIR TO WATER SPLIT SYSTEM HEAT PUMPS WITH E.V.I. COMPRESSORS WZT P4U-P4S SERIES TECHNICAL MANUAL Multiple instructions: the instructions before the unit MTEC.5115 Rev. B 02-2020...
  • Page 2 WZT P4U-P4S Declaration of conformity MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...

  • Page 3: Table Of Contents

    WZT P4U-P4S INDEX 1. INTRODUCTION ..............................................................................................................................................................................................................................................................................................................................................2. SAFETY ....................................................................................................................................................................................3. TECHNICAL CHARACTERISTICS .................................................................................................. 3.3 Other versions ..............................................................................................................................................................................3.9 C ................................
  • Page 4 WZT P4U-P4S ................................................5. UNIT START UP ............................................................................................................................6. USE ........................................................................6.2 Stop ..................................................................................................6.5 ALARM ..................................6.6 CIRC ................................................................................................... 7. UNIT MAINTENANCE .................................................................... 7.2 Access to the unit ..............................................................

  • Page 5: Introduction

    WZT 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.5115.GB-B-1 Operation and maintenance manual WZT series English Rev.
  • Page 6 WZT 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.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 7 WZT P4U-P4S 1.7 General Description of Symbols Used BANNED WARNING ACTION REQUIRED MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 8 WZT 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.5115.GB-B-1 Operation and maintenance manual WZT series English Rev.
  • Page 9 WZT P4U-P4S Manufacturer: PD322111 +39 049 9731022 123456 1WZT.0302.NNRV2U-1A 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 Equivalente...

  • Page 10: Safety

    WZT 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.5115.GB-B-1 Operation and maintenance manual WZT series English Rev.
  • Page 11 WZT 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: Technical Characteristics

    WZT P4U-P4S 2.6.5 Further medical treatment 3. TECHNICAL CHARACTERISTICS 3.1 Unit description 3.1.1 Frame 3.1.2 Noise Reduction 3.1.3 Refrigerant circuit 3.1.4 Compressors 3.1.5 User heat exchangers MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 13 WZT P4U-P4S 3.1.6 Electric enclosure 3.1.7 Microprocessors 3.1.8 Control and protection devices 3.1.9 User water strainer 3.2 Outdoor unit 3.2.1 Remote source heat exchanger 3.2.2 Fans (VECE) MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...

  • Page 14: Other Versions

    WZT P4U-P4S 3.2.3 Condensate discharge drip tray with antifreeze heater (BRCA) 3.3 Other versions 3.3.1 Version HH 3.3.2 Version RV 3.3.3 Version HE/NN 3.3.4 Version P4S 3.3.5 Version P4U 3.4 Accessories description 3.4.1 Rubber vibration dampers (KAVG) 3.4.2 Antifreeze heater (RAEV) This 3.4.3 RS485 serial interface card MODBUS protocol (INSE) MODBUS protocol.
  • Page 15 WZT P4U-P4S 3.4.6 Remote control panel (PCRL) 3.3.7 Cascade control system via RS485 (SGRS) 3.5 What is the E.V.I. technology (enhanced vapour injection) m +i Pm+i MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 16 WZT P4U-P4S 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.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 17 WZT P4U-P4S 3.6 Technical data 1002 1202 4150 5148 7573 9228 10267 11951 13853 15095 17510 6000 9000 10000 22000 22000 22000 22000 33000 33000 2088 2088 2088 2088 2088 2088 2088 2088 2088 on the unit. MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev.
  • Page 18 WZT P4U-P4S 1002 1202 4150 5148 7573 9228 10267 11951 13853 15095 17510 6000 9000 10000 22000 22000 22000 22000 33000 33000 2088 2088 2088 2088 2088 2088 2088 2088 2088 on the unit. MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev.
  • Page 19 WZT P4U-P4S 3.6.1 Heat exchanger water pressure drops 852-1202 252 - 302 452 - 502 2500 4500 6500 8500 10500 12500 14500 16500 3.7 Operation limits (RV versions Only) - 20 - 10 - 20 - 10 3.7.2 User hot water temperature (Winter operation) MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev.
  • Page 20 WZT P4U-P4S 3.7.3 Cold water temperature (RV versions Only) 3.7.4 Ambient air temperature MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 21 WZT P4U-P4S 3.8 Domestic hot water production 3.8.1 Solution 1 MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 22 WZT P4U-P4S 3.8.2 Solution 2 This is the solution for existing buildings or for those applications where it is not possible to remove existing plants. possibility of using the existing DHW tank. COLD WATER in the tank. AS MUCH AS POSSIBLE MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev.
  • Page 23 WZT P4U-P4S 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 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 24: Installation

    WZT P4U-P4S OUTDOOR UNIT - SINGLE HEAT EXCHANGER Bande d’ottava (Hz) Mod. dB(A) dB(A) dB(A) dB(A) dB(A) dB(A) dB(A) dB(A) dB(A) dB(A) 1002 1202 OUTDOOR UNIT - DOUBLE HEAT EXCHANGER Octave bands (Hz) Mod. dB(A) dB(A) dB(A) dB(A) dB(A) dB(A) dB(A) dB(A) dB(A)

  • Page 25: Inspection

    WZT P4U-P4S tion. 4.2 Health and safety Considerations 4.3 Personal protective equipment 4.4 Inspection MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 26 WZT P4U-P4S In Case of Damage 4.5 Storage 4.5.1 Shipment 4.6 Unpacking 4.7 Lifting and handling MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 27 WZT P4U-P4S 4.8 Location and minimum technical clearances Outdoor unit installation INDOOR UNIT OUTDOOR UNIT INDOOR UNIT 1002 1202 UNITÀ INTERNA A (mm) HE/NN 1630 1630 1630 1630 1630 1630 1630 1630 1630 B (mm) HE/NN C (mm) HE/NN 1145 1145 1145 1145...
  • Page 28 WZT P4U-P4S 4.9 Installation of rubber vibration dampers (KAVG) sez A - A ØM ØD ØE Mod. WZT 252÷1202 4.10 Installation of rubber vibration dampers on outdoor unit (KAVM) MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 29 WZT P4U-P4S 4.11 Serial interface card RS485 (INSE) Supervision TELEPHONE LINE 4.12 Installation of condensate drip tray (BRCA) MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 30 WZT P4U-P4S 4.12.1 Installation of the heating cable MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 31 WZT P4U-P4S 4.13 Refrigerant connections 4.13.1 Operation mode only cooling 4.13.2 Reversible operation heat pump and chiller 4.13.3 Indoor unit installed at a higher level than outdoor heat exchanger • • • 4.13.4 Indoor unit installed at a lower level than outdoor heat exchanger •...
  • Page 32 WZT P4U-P4S 4.13.5 Refrigerant lines diameter Distance [m] Mod. gas[mm] Liquid[mm] gas [mm] Liquid[mm] gas [mm] Liquid[mm] 1002 1202 4.13.6 Refrigerant charge for liquid line Liquid line diameter [mm] Refrigerant charge [g/m] Liquid line diameter [mm] Refrigerant charge [g/m] 4.13.7 Heating / Cooling capacity correction factor Refrigerant line 0 mt.
  • Page 33 WZT P4U-P4S 4.14 Hydraulic connections • • • • • • Heating mode: Cooling mode: 4.15 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.5115.GB-B-1 Operation and maintenance manual WZT series English Rev.
  • Page 34 WZT P4U-P4S 4.16 Hydraulic components 4.16.1 P4S Versions P4U Versions MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 35 WZT P4U-P4S 4.17 User circuit minimum water content nection of the unit. Model 1002 1202 Minimum water content winter mode (l) 1000 1000 Minimum water content summer mode (l) 4.18 Minimum domestic hot water circuit content Model 1002 1202 Minimum water content hydraulic circuit (l) 1000 1000 The above values do not guarantee the...
  • Page 36 WZT P4U-P4S 4.21 Typical installations 4.21.1 Combined heating / Cooling / Domestic hot water production – 4 pipe system The plant components supplied by the company are: STANDARD OPTIONS NOT AVAILABLE MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 37 WZT P4U-P4S 4.22 Electric connections: preliminary safety information FROST PROTECTION MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 38 WZT P4U-P4S 4.23 Electric data Model NN 1002 1202 Power supply Control board Auxiliary circuit Fans power supply Line section PE section present in the units. 4.24 Electric connections 4.24.1 Power supply and electrical connections MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev.
  • Page 39 WZT P4U-P4S 4.24.2 Remote wiring connections (compulsory) USER CIRCUIT WATER INLET SENSOR (BTI) USER CIRCUIT WATER PUMP DOMESTIC HOT WATER SENSOR (BTS) DOMESTIC HOT WATER CIRCUIT PUMP MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 40 WZT P4U-P4S 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 DOMESTIC HOT WATER ELECTRIC INTEGRATION HEATERS PRIORITY SELECTOR (Hot water) HEATING CABLE MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English...
  • Page 41 WZT P4U-P4S WEATHER COMPENSATED SENSOR (BTE) USER CIRCUIT WATER OUTLET SENSOR (BTO) DOMESTIC HOT WATER OUTLET SENSOR (BTU) USER CIRCUIT FLOW SWITCH (SFW1) 4.24.5 Outdoor unit wiring connections DEFROSTING PROBE 1 DEFROSTING PROBE 2 MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev.
  • Page 42 WZT P4U-P4S OUTDOOR POWER SUPPLY UNIT (THREE-PHASE) CONDENSING/EVAPORATING FANS Fans thermal protection 4.24.5 Outdoor unit wiring connections (optional) ELECTRONIC EXPANSION VALVE SIGNAL ELECTRONIC EXPANSION VALVE ALARM MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 43 WZT P4U-P4S 4.25 Positioning of the user circuit water inlet sensor (BTI) Correct positioning of the BTI sensor Incorrect positioning of the BTI sensor 4.26 Positioning of the domestic hot water circuit sensor (BTS) Correct positioning of the BTS sensor Incorrect positioning of the BTS sensor MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev.
  • Page 44 WZT P4U-P4S 4.27 Refrigerant circuit layout 4.27.1 Refrigerant circuit layout version P4S EVV-EVH EXV 1 EXV 2 YTSO P4S Version MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...

  • Page 45: Unit Start Up

    WZT P4U-P4S 5. UNIT START UP 5.1 Preliminary checks 5.1.1 Before start-up • • • • • • • • • • • • • MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 46 WZT P4U-P4S 5.1.2 Device Set-point Differential Reset Device Set-point Differential Reset ----- °C ----- °C ----- ----- ----- °C ----- MANUAL °C 5.1.3 Controls during unit operation • • • MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 47 WZT 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 48 WZT 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.5115.GB-B-1 Operation and maintenance manual WZT series English Rev.
  • Page 49 WZT P4U-P4S 5.3.1 Remote keyboard connection ENTER ENTER • • 5.3.3 Wall mounting connection diagram MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...

  • Page 50: Use

    WZT 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.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...

  • Page 51: Stop

    WZT 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 52 WZT P4U-P4S 6.3 Set point 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 53: Alarm

    WZT 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 54: Circ

    WZT 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 55 WZT 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 56 WZT P4U-P4S ALARM ENTER ALARM ENTER Press the SERVICE Press ENTER press MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 57 WZT 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 58 WZT 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 Weather compensated function MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev.
  • Page 59 WZT 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 60 WZT P4U-P4S 6.7.2 Setting date and time ENTER Press 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 00:00 Time band n°2...
  • Page 61 WZT P4U-P4S 6.7.3 Compressor maintenance ENTER ENB/DIS RESET RESET press ENTER HOURS STARTS Compressor mainteinance Compressor mainteinance Circuit 1 Circuit 1 Hour Start-up Comp 1 Circuit 1 Comp 2 Circuit 2 RESET RESET ALARM ENTER ENB/DIS HOURS STARTS 6.7.4 Water pumps ENTER RESET HOURS...
  • Page 62 WZT P4U-P4S 6.7.7 Alarm log ENTER RST ALL people. 2/10 Alarm log Alarm log b1HP b1HP High pressure circuit 1 10:12 13/09/2016 b1AC b1AC 11:32 13/09/2016 Antifreeze circuit 1 summer mode RST ALL ALARM 6.7.8 Defrost ENTER ENTER Defrost status Defrost status Circuit 1 Circuit 1...
  • Page 63 WZT P4U-P4S 6.7.9 Eletrical heater ENTER Heaters Heaters Liquid solenoid valves Liquid solenoid valves ALARM 6.7.10 I/O Status (Input/Output) ENTER I/O Status I/O Status Analog input Analog output Digital input Digital output ALARM ENTER 6.7.12 Auxiliary output ENTER Auxiliary output status Auxiliary output status 51.3 °C External air temp.:...
  • Page 64 WZT P4U-P4S 6.7.13 Sanitary water ENTER . Press Antilegionella cycle: disabled Antilegionella cycle: disabled Sanitary water: Sanitary water: Sanitary water reg. temp. Sanitary water reg. temp. 44.9 °C 45.3 °C Antilegionella set point Sanitary water Set point 50.0 °C 60.0 °C Security set point 50.0 °C San.

  • Page 65: Unit Maintenance

    WZT P4U-P4S 7. MAINTENANCE OF THE UNIT 7.1 General warnings • • • 7.2 Drive access MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 66 WZT P4U-P4S 7.3 Scheduled maintenance Search for leaks CASE Visual Inspection Pressure Test 7.4 Periodical checks and start-up MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 67 WZT 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.5115.GB-B-1 Operation and maintenance manual WZT series English Rev.
  • Page 68 WZT P4U-P4S 7.4.3 Compressors Frequency Action to be performed As neces- service. 7.4 Refrigerant circuit repair Therefore: • • • • • • MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...

  • Page 69: Decommissioning

    WZT P4U-P4S 8. DECOMMISSIONING 8.1 Disconnect the unit • • • • • 8.2 Disposal, recovery and recycling 8.3 RAEE Directive (only UE) MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 70 WZT P4U-P4S 9. DIAGNOSIS AND TROUBLESHOOTING Unit alarms Code Visualization Alarm Description Cause Solution ACF1..ACF19 AEFL ACFL AEUn AHFL AP1...AP10 Pb AL1 ... Pb AL10 nection of the sensor to the AP11...AP20 sensor. AP21...AP27 AtC1 AtC1 AtE1 AtE2 AEht MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev.
  • Page 71 WZT P4U-P4S AEM1 AEM2 AFFC Antif AL FC Atrb Boiler overl AL ALc1 Generic AL1 ALc2 Generic AL2 Probe fault MTEC.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 72 WZT 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.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 73 WZT 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.5115.GB-B-1 Operation and maintenance manual WZT series English Rev. B 02-2020...
  • Page 74 HIDROS Srl...

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