Lochinvar LAHP Series Technical Manual
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Lochinvar LAHP Series Technical Manual

Lochinvar LAHP Series Technical Manual

Super-high temperature water to water heat pumps
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WHK
SUPER-HIGH TEMPERATURE WATER TO WATER HEAT PUMPS
SUPER-HIGH TEMPERATURE WATER TO WATER HEAT PUMPS
Incorporated in this document are the following:
• Declaration of conformity
• Technical manual
Multiple instructions:
Multiple instructions:
MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024
MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English Rev.C 11-2024
LAHP
TECHNICAL MANUAL
TECHNICAL MANUAL
Read and understand the
Read and understand the
instructions before underta-
instructions before underta-
king any work on the unit
king any work on the unit
Original Instructions
Original Instructions

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Summary of Contents for Lochinvar LAHP Series

  • Page 1 MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Original Instructions MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English Rev.C 11-2024 Original Instructions...

  • Page 2: Declaration Of Conformity

    We declare under our own responsibility that the below equipment complies in all parts with the CEE and EN directives. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 3: Table Of Contents

    4.24 Positioning of the user circuit water inlet sensor (bti) ...................... 4.25 Positioning of the domestic hot water circuit sensor (bts) ....................4.26 Refrigerant circuit layout ..............................MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 4 8.1 Unit Isolation & drain down ..............................8.2 Disposal, recovery and recycling ............................8.3 RAEE directive (only for EC countries)..........................9. DIAGNOSIS & TROUBLESHOOTING ................................................................. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 5: Introduction

    In these instructions symbols have been used (described in the following paragraphs) to draw the attention of operators and users to the operations that have a higher risk and which must be performed safely. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 6: Potential Risks

    (special anchors or seismic vibrations to prevent disasters or earthquake. breakages or accidental falls ). MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 7: General Description Of Symbols Used

    A white symbol inserted in a blue circle indicates an action that must be done to avoid a risk. Safety symbols combined in accordance with ISO 3864-2: MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 8: Safety Symbols Used

    The unit is not suitable for operations in environments: • excessively dusty or potentially explosive atmospheres; • where there are vibrations; • where there are aggressive atmospheres MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 9 A facsimile of the label is shown below: LAHP 2604WW The product label should never be removed from the unit. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 10: Safety

    Users and maintenance personnel must be adequately informed about the possible risks of handling potentially toxic substances. Failure to follow such instructions can cause damage to personnel or to the unit. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 11: Prevention Of Inhalation Of High Vapor Concentrations

    Treat symptoms and carry out support therapy as indicated. Do not administer adrenaline or similar sympathomimetic drugs following exposure, due to the risk of cardiac arrhythmia. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 12: Technical Characteristics

    All units are supplied with the following control and protection devices: Return and supply user heat exchanger sensors, return and supply source heat exchanger sensors, high pressure switch with manual reset, low pressure switch with automatic reset, high pressure safety MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 13: Other Versions

    The compressor refrigerant pipes are connected to the refrigerant circuit through “anaconda” an overall noise reduction in the region of 6-8 dB(A). MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 14: Accessories Description

    . It is strongly recommended for use in systems that will expe- rience large load variations. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 15: Technical Data

    (3) Sound power level in accordance with ISO 3744. (2) Average conditions, variable - Reg EU 811/2013 accordance with ISO 3744. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 16: Operation Limits

    The Company will not be liable for claims for damage caused to persons, animals or material goods this manual is prohibited. In case of operations outside of these values, please contact the company. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 17: Compressor Capacity Steps

    0,0001 0,0002 CCCP 0,98 0,94 IPCF 0,98 0,95 CCCP = Cooling capacity correction factor IPCF = Input power correction factor MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 18: Sound Data

    2604 Octave bands (Hz) Mod. dB(A) dB(A) 1212 1412 1804 2304 2604 Lw: Sound power level according to ISO 3744. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 19: Installation

    When operating and maintaining the unit, use the following personal protective equipment listed below, required by law. Protective footwear. Eye protection. Protective gloves. Respiratory protection. Hearing protection. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 20: Inspection

    Prior to unpacking and installing the unit, it is prudent to read this manual, note the information provided on the labels on the unit and to take all precautions required for safe working and to avoid damage. Non compliance with the warnings can create dangerous situations. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 21: Lifting And Handling

    (spring or rubber), In this regard it is necessary to guarantee the minimum service below. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 22 1412 (HT) 1900 2177 1000 1000 1804 1900 3127 1000 1000 2304 1900 3127 1000 1000 2604 1900 3127 1000 1000 MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 23: Installation Of Rubber Vibration Dampers (Kavg)

    Any reversal of polarity will result in the non-functioning unit. The supervision connectivity cable must be telephone one type 2x0, 25 mm2. contacting the assistance. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 24: Source Water Pump Installation

    • Temperature and pressure gauges for maintenance and servicing operations. • Shut-off manual valves to isolate the unit from the hydraulic circuit. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 25: Chemical Characteristics Of The Water

    Model 1212 1412 1804 2304 2604 Minimum water content (l) 1200 1500 1700 1200 1500 1700 Safety valve (bar) MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 26: Installation With Source Open Circuit (Heat Pump Water Water)

    36 consecutive hours (to be made, possibly, towards the end of winter season). MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 27: Hydraulic Components

    If the unit is supplied without a pump, the pump must be installed with the supply side toward the water inlet con- nection of the unit. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 28 Safety Valve Check valve The pump (O) must be installed with the water supply side facing the unit water inlet connection. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 29 Medium heat exchanger Source water Filter The pump must be installed with the water supply side facing the unit water inlet connection. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 30 Aquifer Thermal Energy Storage (ATES) system. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 31: Domestic Hot Water (Dhw) Hydraulic Circuit

    • Open the drainage valve outside the unit and all the installation and terminal air vent valves. possible re-cycling or for correct disposal. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 32: Frost Protection

    If opened, the main switch cuts the power off to any electric heater and antifreeze device supplied with the unit, in- cluding the compressor crankcase heaters. The main switch should only be disconnected for cleaning, maintenance or unit reparation. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 33: Electric Data

    Electric data may change for updating without notice. It is therefore necessary to refer always to the wiring diagram present in the units. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 34: Electric Connections

    For remote display of a general alarm, connect the visual or audible device between terminals 90-91-92. Contacts 90/91 NC (Normally closed) Contacts 91/92 NO (Normally opened) MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 35 This is used to measure the outlet user temperature; it is also used as antifreeze protection in cooling mode. USER CIRCUIT FLOW SWITCH (SFW1) MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 36: Positioning Of The User Circuit Water Inlet Sensor (Bti)

    Source termostatic valve solenoid valve Compressor YTUT User termostatic valve solenoid valve Free-cooling side User recovery solenoid valve Sanitary recovery solenoid valve MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 37: Refrigerant Circuit Layout

    If there is an accidental start-up before the 12 hours pre-heating period has elapsed, the compressors could be seriously damaged and therefore the warranty will immediately terminate . MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 38 This would indicate a shortage of refrigerant. A few vapour bubbles are acceptable. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 39: Position Of The Control Panel

    Free cooling is active (not available). Indicates that an alarm is active. Domestic hot water. Economy function Indicates that the defrost is active. Unloading function. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 40: To Remote The Control

    • In case of power supply failure (wire black or red), the keyboard doesn’t work. • In case of comunication problems, the display shows “noL” message. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 41 Use the selector switch as shown below to choose the desired display: For remote display electrical connections, always refer to the electrical diagram supplied with the unit. ENTER ENTER Remoto MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 42: Use

    Isolation will result in no supply for the crankcase heater and on start up the compressor could be seriously damaged. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 43: Stop

    °C Evaporator outlet temperature 27.0 °C External air temp. (FC) °C 31.8 San. water temperature N.C. PROBES ALARM SERVICE CIRC. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 44: Set Points

    The units are supplied with a very sophisticated control system with many other parameters that are not adjustable by the end user; these parameters are protected by a manufacturer password. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 45: Probes Key

    35.0 °C External air temp. (FC) °C San. water temperature 50.0 °C PROBES ALARM SERVICE CIRC. RST ALL RESET EXIT MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 46: Circ Key

    Circuits status Circuits status Condenser fan Compressors status Unloading status Evaporating-condensing probe Evaporating pump status ALARM ENTER EXIT ALARM ENTER EXIT MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 47 Condenser fan Condenser fan Condenser fan Cond. Cond. fan 1 fan 1 Cond. Cond. fan fan 2 2 ALARM EXIT MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 48: Service Key

    Change the parameters by pressing the , and then press Press the key to return to the main menu. EXIT MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 49 Code Meaning Set point Auxiliary output Main visualization Antifreeze Dynamic set Defrost Energy saving Sanitary water Compressor racks Alarms Compressor MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 50 20.0 °C Dynamic set point Dynamic set point ALARM ENTER EXIT ALARM EXIT Sd05 °C Sd06 -25.0 °C ALARM EXIT MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 51 With the energy saving mode activated, if the SET key is pressed twice the bottom of the display shows the SEtTR measured ambient temperature condition. (St04) (Sd01) (Sd03) (Sd05) MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 52 ES31 Sunday: time band selection Increased energy saving set in heat pump operation ES16 ES32 Energy saving: offset DHW setpoint MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 53: Operating Modes

    EXIT Up to three time bands can be set. and T2 keys. Press T5 key to view all available parameters. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 54 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.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 55: Compressor Maintenance

    It is possible to display the status of the circuits. The function T7 is only possible by service people. Circuits Circuits Circuit 1 enabled Circuit 2 ALARM ENB/DIS EXIT MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 56 45 : 0 Time to start (mm:ss) Circuit 2 Circuit 2 ALARM ENTER EXIT MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 57 It is possible to display: probes status, analog input and output, digital input and output. I/O Status I/O Status Analog input Analog output Digital input Digital output ALARM ENTER EXIT MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 58: Auxiliary Output

    Analog output 1 winter set point Analog output 1 winter set point -30.0 °C Output % Output % ALARM ENTER EXIT ALARM EXIT MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 59: Control Panel

    T1 and T2 and press T7. Control panel Control panel Contrast & backlight Languge selection System information ALARM ENTER EXIT MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 60: Acoustic Signal Silencing

    Before restarting the unit, verify that the cause of the emergency stop has been eliminated Restarting the unit proceeding as follows: Turn the main switch ON. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 61: Maintenance Of The Unit

    1.5 meters away from external surfaces in which operators and technicians only can operate, must be provided. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 62: Scheduled Maintenance

    The top case and dischar- ge line of compressor are usually at high temperature. Care must be taken when working in their surroundings. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 63 In order to carry out operations on the refrigerant, it is necessary to observe the European Regulation 517_2014, tionary refrigeration, air conditioning and heat pump equipment”. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 64: Refrigerant Circuit Repair

    • When replacing the compressor following a burn out, it is advisable to wash the cooling system with appropriate products including a • When under vacuum do not switch on the compressor. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 65: Decommissioning

    2011/65/EU (RoHS), but if abandoned in the environment it has a negative impact on the ecosystem. that for which it was designed, as there is a risk of electric shock if used improperly. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...

  • Page 66: Diagnosis & Troubleshooting

    Alarm domestic hot water inlet tempe- rature sensor Alarm domestic hot water outlet temperature sensor MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 67 Compressor 1 overload Replace the compressor. operation limits. Compressor 1 input current outside C2tr Compressor 2 overload Replace the compressor. operation limits. MTEC.4411.GB-C-122 Operation and maintenance manual WHK series English MTEC.4411.GB-C-57 Operation and maintenance manual LAHP series English Rev.C 11-2024 Rev.C 11-2024...
  • Page 68 Technical data shown in this booklet are not binding. The reference languages for the whole documentation are Italian and English. The other languages are to be considered only as guidelines. Technical data shown in this booklet are not binding. The reference languages for the whole documentation are Italian and English. The other languages are to be considered only as guidelines.

This manual is also suitable for:

Lahp 2604ww

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