A.O. Smith AWHP Series Technical Manual
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A.O. Smith AWHP 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 P2U/P2S
TECHNICAL MANUAL
Multiple instructions:
AWHP
SERIES
SERIES
Rev. C 02-2020
Rev. C 02-2020
the instructions before
the unit

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Summary of Contents for A.O. Smith AWHP Series

  • 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 P2U/P2S AWHP SERIES SERIES TECHNICAL MANUAL Multiple instructions: the instructions before the unit Rev. C 02-2020 Rev. C 02-2020...
  • Page 2 AWHP LZT P2U/P2S Declaration of conformity MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...

  • Page 3: Table Of Contents

    ..................................................................................................................................................................................................................................................................................................................................................................................4.22 Electric connections .................................................................................................... MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 4 6.6 CIRC ................................................................................................... 7. UNIT MAINTENANCE ................................................................................................................................................................................................. 8. DECOMMISSIONING ..................................................................................................................................................................................MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...

  • Page 5: Introduction

    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.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 6 METHOD OF INJURY PRECAUTIONS RISK RISK Burns. severe burns. unit enclosure severe burns. unit. severe burns. open. Entire unit Entire unit MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 7 AWHP LZT P2U/P2S 1.7 General Description of Symbols Used BANNED WARNING ACTION REQUIRED MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 8 MOVING PARTS HOT SURFACES SHARP SURFACES EARTH CONNECTION READ AND UNDERSTAND THE INSTRUCTIONS RECOVER OR RECYCLE MATERIAL 1.9 Limitations and prohibited use MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 9 Weight Contiene gas fluorurati ad effetto serra disciplinati dal protocollo di Kyoto Contains fluorinated greenhouse gasses covered by the Kyoto protocol MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...

  • Page 10: Safety

    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.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 11 2.5.4 Ingestion 2.6 First Aid Measures 2.6.1 Inhalation 2.6.2 Contact with skin 2.6.3 Contact with eyes 2.6.4 Ingestion 2.6.5 Further medical treatment MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 12 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.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...

  • Page 13: Other Versions

    3.2.4 SE version 3.2.4 SE Version 3.2.5 Version LN 3.2.5 HA Version 3.2.6 HE Version 3.2.6 Version SLN 3.2.7 Version LS MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 14 3.3.4 RS485 serial interface card modbus protocol (INSE) (Standard for SE / HE versions) 3.3.6 Electronic expansion valve (VTEE) 3.3.7 Electronic soft starter (DSSE) MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 15 3.3.10 Hydraulic kit with one pump without tank - user circuit (A1NTU) 3.3.11 Hydraulic kit with two pumps without tank - user circuit (A2NTU) 3.3.12 Cascade control system (SGRS) MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 16 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.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 17 R410A R410A R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 2088 2088 on the unit. MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 18 R410A R410A R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 2088 2088 on the unit. MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 19 R410A R410A R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 2088 2088 on the unit. MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 20 R410A R410A R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 2088 2088 on the unit. MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 21 - 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.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 22 AWHP LZT P2U/P2S MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 23 AWHP LZT P2U/P2S 3.7 Domestic hot water production 3.7.1 Solution 1 MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 24 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.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 25 Fouling factor 0.00005 0.0001 0.0002 0.98 0.94 0.98 0.95 CCCP = Cooling capacity correction factor IPCF = Input power correction factor MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 26 Octave bands (Hz) Mod. dB(A) dB(A) AWHP SE/LN SE / LS AWHP ACF/LN HA / LS AWHP LN HE / LS MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 27 HA / XL Octave bands (Hz) Mod. dB(A) dB(A) HE/ XL AWHP SLN HE / NN AWHP Octave bands (Hz) Mod. dB(A) dB(A) MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 28 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.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...

  • Page 29: Inspection

    AWHP LZT P2U/P2S 4.4 Inspection In Case of Damage 4.5 Storage 4.5.1 Shipment 4.6 Unpacking MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 30 AWHP LZT P2U/P2S 4.7 Lifting and handling 4.8 Location and minimum technical clearances MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 31 1000 2000 2000 H (mm) AWHP HE/NN AWHP HE/NN 1080 1080 1100 1100 1110 1110 1120 1120 1140 1140 1560 1580 MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 32 A - A ØM ØD ØE Mod. 201÷251 24÷30 401÷551 40÷50 651÷1001 60÷100 4.10 Serial interface card RS485 (INSE) Supervision MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 33 AWHP LZT P2U/P2S 4.11 Installation of condensate drip tray (BRCA) 4.11.1 Installation of the heating cable MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 34 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.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 35 4.14 Hydraulic components 4.14.1 P2S Versions P2U Versions User Circuit 4.14.2 P2S Versions + A1NTU/A2NTU P2U Versions + A1NTU/A2NTU User Circuit MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 36 4.17 Filling the hydraulic circuit • • • • • 4.18 Emptying the installation • • • MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 37 4.19.1 Combined heating / Cooling / Domestic hot water production – 2 pipe system P2S User circuit sensor The plant components supplied by the company are: STANDARD OPTIONS NOT AVAILABLE User circuit sensor MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 38 AWHP LZT P2U/P2S 4.20 Electric connections: preliminary safety information FROST PROTECTION MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 39 Model NN 1002 1202 Power supply Control board Auxiliary circuit Fans power supply Line section PE section present in the units. MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...

  • Page 40: 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.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 41 REMOTE SUMMER / WINTER CHANGE OVER REMOTE GENERAL ALARM 90-91-92. USER CIRCUIT ELECTRIC INTEGRATION HEATERS DOMESTIC HOT WATER ELECTRIC INTEGRATION HEATERS PRIORITY SELECTOR (Hot water) MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 42 WEATHER COMPENSATED SENSOR (BTE) USER CIRCUIT WATER OUTLET SENSOR (BTO) DOMESTIC HOT WATER OUTLET SENSOR (BTU) USER CIRCUIT FLOW SWITCH (SFW1) MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 43 4.24 Positioning of the domestic hot water circuit sensor (BTS) Correct positioning of the BTS sensor Incorrect positioning of the BTS sensor MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 44 EXV 2 EXV 1 EXV 4 BASICALLY, THE REFRIGERATOR DIAGRAM IS PURELY INDICATIVE THE FUNCTIONAL DIAGRAM IS SUPPLIED WITH THE UNIT MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 45 EXV 3 EXV 1 EXV 4 BASICALLY, THE REFRIGERATOR DIAGRAM IS PURELY INDICATIVE THE FUNCTIONAL DIAGRAM IS SUPPLIED WITH THE UNIT MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 46 5. UNIT START UP 5.1 Preliminary checks 5.1.1 Before start-up • • • • • • • • • • • • • MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 47 5.1.2 Device Set-point Differential Reset Device Set-point Differential Reset ----- ----- ----- support. 5.1.3 Controls during unit operation • • • MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 48 Indicates that an alarm is active. Domestic hot water. Economy function Indicates that the defrost is active. Unloading function (not available). MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 49 ENTER Rosso / Red Nero / Black Nero / Black Bianco / White Bianco / White Rosso / Red • • MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 50 5.3.2 Panel mounting connection diagram 5.3.3 Wall mounting connection diagram 5.4.4 Selection built in display or remote keyboard ENTER ENTER Remoto MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...

  • Page 51: Use

    6.1.1 Switch the unit on from the keyboard Cooling mode Heating mode Domestic hot water mode 5.3.1 Selection built in display or remote keyboard MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...

  • Page 52: Stop

    28.4 °C Evaporator outlet temperature °C 27.0 External air temp. (FC) °C 31.8 San. water temperature N.C. PROBES ALARM SERVICE CIRC. MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 53 San. water temperature 50.0 °C PROBES ALARM SERVICE CIRC. ALARM EXIT press EXIT 6.3.1 Adjustable parameters Function Adjustment limit Default value MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 54 Evaporator outlet temperature °C 35.0 External air temp. (FC) °C San. water temperature 50.0 °C PROBES ALARM SERVICE CIRC. RST ALL RESET EXIT MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...

  • Page 55: Circ

    Circuits status Circuits status Condenser fan Compressors status Unloading status Evaporating-condensing probe Evaporating pump status ALARM ENTER EXIT ALARM ENTER EXIT MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 56 EXIT ALARM EXIT Condenser fan Condenser fan Cond. Cond. fan 1 fan 1 Cond. Cond. fan fan 2 2 ALARM EXIT MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 57 AWHP LZT P2U/P2S 6.7 SERVICE key ENTER EXIT ENTER EXIT SERVICE ENTER EXIT MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 58 1st level password (Pr1) Password OK! Press ENTER to continue ALARM ENTER EXIT ENTER Code Meaning Code Meaning Set point Defrost MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 59 Sd04 20.0 °C Dynamic set point Dynamic set point ALARM ENTER EXIT ALARM EXIT Sd05 °C Sd06 -25.0 °C ALARM EXIT MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 60 AWHP LZT P2U/P2S Weather compensated function MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 61 ES22 ES07 ES23 ES08 ES24 ES09 ES25 ES10 ES26 ES11 ES27 ES12 ES28 ES13 ES29 ES14 ES30 ES15 ES31 ES16 ES32 MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 62 Time band n°2 ES03 ES03 05:00 05:00 Time band n°3 Time band n°3 Energy Saving Energy Saving ALARM ENTER EXIT ALARM EXIT MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 63 Tuesday 00:00 00:00 08:00 08:00 Disabled Disabled Disabled Disabled Time band n°3 Time band n°3 Wednesday Wednesday ALARM EXIT ALARM EXIT MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 64 Sanitary water pump ALARM RESET EXIT 6.7.5 Circuit maintenance ENTER ENB/DIS Circuits Circuits Circuit 1 enabled Circuit 2 ALARM ENB/DIS EXIT MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 65 45 : 0 Time to start (mm:ss) Circuit 2 Circuit 2 ALARM ENTER EXIT MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 66 EXIT 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 EXIT MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 67 Analog output 1 winter set point Analog output 1 winter set point -30.0 °C Output % Output % ALARM ENTER EXIT ALARM EXIT MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 68 6.7.15 Control panel ENTER Control panel Control panel Contrast & backlight Languge selection System information ALARM ENTER EXIT 6.8 Acoustic signal silencing MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...

  • Page 69: Unit Maintenance

    AWHP LZT P2U/P2S 7. MAINTENANCE OF THE UNIT 7.1 General warnings • • • 7.2 Drive access MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 70 AWHP LZT P2U/P2S 7.3 Scheduled maintenance Search for leaks CASE Visual Inspection Pressure Test 7.4 Periodical checks MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 71 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.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 72 7.4.3 Compressors Frequency Action to be performed As neces- service. 7.5 Refrigerant circuit repair Therefore: • • • • • • MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...

  • Page 73: Decommissioning

    8. DECOMMISSIONING 8.1 Disconnect the unit • • • • • 8.2 Disposal, recovery and recycling 8.3 RAEE Directive (only UE) MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 74 9. DIAGNOSIS AND TROUBLESHOOTING Code Alarm Description Cause Solution ACF1 ACF2 ACF3 ACF4 ACF5 ACF6 ACF7 ACF8 ACF9 AEFL AEUn AHFL MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 75 AtE1 AtE2 Restore the correct user circuit B1 HP b1AC b1AH b1dF b1hP circuit 1 B1LP b1lP circuit 1 MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 76 AWHP LZT P2U/P2S b1tF C1tr C2tr MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 77 AWHP LZT P2U/P2S MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 78 AWHP LZT P2U/P2S MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...
  • Page 79 AWHP LZT P2U/P2S MTEC.5000.GB-C-1 Operation and maintenance manual LZT series English MTEC.5000.GB-C-92 Operation and maintenance manual AWHP series English Rev. C 02-2020...

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