Panasonic WH-MHF12G9E8 Service Manual
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Panasonic WH-MHF12G9E8 Service Manual

(mono bloc) air-to-water heat pump system
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This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to
service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.
In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.
WARNING
PRECAUTION OF LOW TEMPERATURE
Order No. PAPAMY1503092CE
Mono Bloc Unit
WH-MHF09G3E8
WH-MHF12G9E8
Destination
Europe
Turkey
© Panasonic Corporation 2015.

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Summary of Contents for Panasonic WH-MHF12G9E8

  • Page 1 PRECAUTION OF LOW TEMPERATURE In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit. © Panasonic Corporation 2015.

  • Page 2: Table Of Contents

    Protection Control for All Operations ...76     WH-MHF09G3E8 ........... 5     13.2 Protection Control for Heating Operation..78     WH-MHF12G9E8 ........... 7     Servicing Mode ..........79     Features ............... 9     14.1 Remove The Cabinet Front Plate ....79  ...

  • Page 3: Safety Precautions

    1. Safety Precautions  Read the following “SAFETY PRECAUTIONS” carefully before installation of (Mono bloc) Air-to-Water Heatpump system (hereafter referred to as “Mono bloc unit”).  Electrical works and water installation works must be done by licensed electrician and licensed water system installer respectively.
  • Page 4 WARNING This equipment is strongly recommended to be installed with Residual Current Device (RCD) on-site according to the respective national wiring rules or country-specific safety measures in terms of residual current. The unit is only for use in a closed water system. Utilization in an open water system may lead to excessive corrosion of the water piping and risk of incubating bacteria colonies, particularly Legionella, in water.

  • Page 5: Specifications

    2. Specifications WH-MHF09G3E8 Item Unit Refrigerant System Performance Test Condition EN14511 Condition A7W35 A2W35 (Ambient/Water) 9.00 9.00 Heating Capacity BTU/h 30700 30700 kcal/h 7740 7740 4.64 3.45 kcal/hW 3.99 2.97 Air Flow /min (ft /min) 76.8 (2710) Refrigeration Control Device Expansion Valve Refrigeration Oil FV50S (1600)
  • Page 6 Item Unit Mono Bloc Unit Power factor means total figure of compressor and outdoor fan motor. Number of core Power Cord Length m (ft) Thermostat Electronic Control Protection Device Electronic Control Item Unit Water System Performance Test Condition EN14511 Outdoor Ambient °C -20 ~ 35 Operation Range...

  • Page 7: Wh-Mhf12G9E8

    WH-MHF12G9E8 Item Unit Refrigerant System Performance Test Condition EN14511 Condition A7W35 A2W35 (Ambient/Water) 12.00 12.00 Heating Capacity BTU/h 41000 41000 kcal/h 10320 10320 4.46 3.26 kcal/hW 3.84 2.80 Air Flow /min (ft /min) 80.0 (2830) Refrigeration Control Device Expansion Valve...
  • Page 8 Item Unit Mono Bloc Unit Power factor means total figure of compressor and outdoor fan motor. Number of core Power Cord Length m (ft) Thermostat Electronic Control Protection Device Electronic Control Item Unit Water System Performance Test Condition EN14511 Outdoor Ambient °C -20 ~ 35 Operation Range...

  • Page 9: Features

    3. Features  Inverter Technology - Energy saving  High Efficiency  Compact Design  Environment Protection - Non-ozone depletion substances refrigerant (R407C)  Easy to use remote control  Weekly Timer setting  Quality Improvement - Random auto restart after power failure for safety restart operation - Gas leakage protection - Prevent compressor reverse cycle - Inner protector to protect compressor...

  • Page 10: Location Of Controls And Components

    4. Location of Controls and Components Mono Bloc Unit Air inlet (rear) Top Plate Air inlet (side) Cabinet Front Plate Air outlet Handle (2 pieces front and 2 pieces behind)
  • Page 11 4.1.1 Main Components (VIEW WITHOUT COVER) For 9kW models DETAIL A (WITHOUT OLP COVER) View without cabinet top plate For 12kW models Optional cord / cable :- • Power Supply 1 3-way Valve cable (3 × min 0.5mm²) • Power Supply 2 Booster Heater cord (3 ×...
  • Page 12 4.1.2 Location of Control 4.1.2.1 Remote Control The user interface allows the installer and user to setup, use and maintain the unit. 　 OFF/ON Button This button starts or stops the mode operation function of the unit. 10 11 Operation LED This LED indicates the unit is in operation.
  • Page 13 4.1.3 To adjust initial settings Dealer Select menus and determine settings according to the system available in the household. It is recommended that all alterations of settings are done by an authorised dealer or specialist. Operation LED Display • After initial installation, you may manually adjust the settings. The initial setting remains active until the user changes it.
  • Page 14 Operation/settings to be done only by the authorised dealer/specialist. Dealer Operation/settings to be done by the authorised dealer/specialist or user. User Booster Heater To activate or deactivate the water tank’s booster heater. Note: If NO is selected, menu 10 is skipped. Booster Heater Delay Timer 20 minutes ~ To delay time for the booster heater to activate while the system is...
  • Page 15 4.1.4 How to use User The system is turned off by an external switch. Turn on or off the system Press When the system is ON, the operation LED is lit and the actual water outlet temperature and outdoor ambient temperature are shown on the display.
  • Page 16 Operation/settings to be done only by the authorised dealer/specialist. Dealer Operation/settings to be done by the authorised dealer/specialist or user. User Dealer Display Temperature setting System temperature setting The system controls the temperature for each menu based on the outdoor ambient temperature. •...
  • Page 17 User Desired temperature setting Shifting the water temperature This easily shifts the water outlet temperature if the setting is undesirable. 1 Press to enter the water temperature shifting mode. 2 Press to change setting. 3 Press to set the desired temperature. (temperature range: -5 °C ~ 5 °C) Temperature setting <Water outlet...
  • Page 18 Operation/settings to be done only by the authorised dealer/specialist. Dealer Operation/settings to be done by the authorised dealer/specialist or user. User User Weekly timer setting Promotes energy saving by allowing you to set up to 6 programmes in any given day. Lights up if Timer operation is selected Indicates the next timer operation programme...
  • Page 19 Dry Concrete Function • During construction to dry the concrete under a preset temperature. 1 Press simultaneously and hold for 5 seconds until the display shows “ ”. 2 Press (The display shows “ ”.) 3 Press to select day. Press to set the desired temperature.

  • Page 20: Dimensions

    5. Dimensions Mono Bloc Unit <Top View> (579) <Front View> <Side View> <Side View> 1283 (30) 318.5 <Back View> Unit: mm 83.5...

  • Page 21: Refrigeration And Water Cycle Diagram

    6. Refrigeration and Water Cycle Diagram Outdoor Side Mono bloc Unit Water Pressure Gauge Expansion Liquid Vessel Water Capillary Side Flow Expansion Tube (2-Way Switch Valve Strainer Strainer Valve) Subcooler Water Inlet (Connect Water Pump Sanitary Pipe Tank) Temp. Strainer Expansion Strainer Pipe...
  • Page 22 Indoor Side Room Thermo (Optional) Fan Coil Unit (Heating / Cooling) Connect to Mono bloc Unit Terminal Board (Water System) Panel Heater Unit (Heating) 3-Way Valve 2-Way Valve To Water Inlet Mono bloc Unit From Water Outlet Mono bloc Unit Floor Heating Panel (Heating) Heater 1 (3kW)

  • Page 23: Block Diagram

    7. Block Diagram WH-MHF09G3E8...

  • Page 24: Wh-Mhf12G9E8

    WH-MHF12G9E8...

  • Page 25: Wiring Connection Diagram

    8. Wiring Connection Diagram WH-MHF09G3E8...

  • Page 26: Wh-Mhf12G9E8

    WH-MHF12G9E8...

  • Page 28: Electronic Circuit Diagram

    9. Electronic Circuit Diagram WH-MHF09G3E8...

  • Page 29: Wh-Mhf12G9E8

    WH-MHF12G9E8...

  • Page 31: Printed Circuit Board

    10. Printed Circuit Board 10.1 Water system 10.1.1 Main Printed Circuit Board CN-SOLAR CN-TH1 CN-TH2 CN-TH3 CN-FLOW CN-T1 CN-OLP2 CN-REMOTE2 CN-THERMO CN-PUMP2 CN-OLP1 CN-RCV2 AC1-L1 CN-V3 DATA AC1-L2 CN-PWR AC1-L3 CN-HT...
  • Page 32 10.1.2 Solar Printed Circuit Board (Optional)

  • Page 33: Refrigerant System

    10.2 Refrigerant System 10.2.1 Main Printed Circuit Board...
  • Page 34 10.2.1.1 Noise Filter Printed Circuit Board...

  • Page 35: Installation Instruction

    11. Installation Instruction Mono Bloc Unit Dimension Diagram 1283 Front view Rear view Bottom view Drain hose connector Water Outlet Pipe Water Inlet Pipe...
  • Page 36 Main Components (VIEW WITHOUT COVER) For 9kW models DETAIL A (WITHOUT OLP COVER) View without cabinet top plate For 12kW models Optional cord / cable :- • Power Supply 1 3-way Valve cable (3 × min 0.5mm²) • Power Supply 2 Booster Heater cord (3 ×...

  • Page 37: Select The Best Location

    11.1 Select The Best Location 11.2 Mono Bloc Unit Installation  Mono bloc unit will become heavy when filled with Install the Mono bloc unit in outdoor locations only.  water. Please install the unit on a strong concrete floor Avoid installations in areas where the ambient and consider the weight of the unit and water.

  • Page 38: Piping Installation

    11.3 Piping Installation WARNING This section is for authorized and licensed electrician / water system installer only. Work behind the front plate secured by screws must only be carried out under supervision of qualified contractor, installation engineer or service person. Please engage a licensed water circuit installer to install this water circuit.

  • Page 39: Connect The Cord And Cable To Mono Bloc Unit

    Drainage piping installation  Use a drain hose with inner diameter of 15 mm.  The hose must be installed in a continuously downward direction and left open to the frost-free atmosphere.  If drain hose is long, use a metal support fixture along the way to eliminate the wavy pattern of drain tube. ...
  • Page 40 Bind all power supply cords to the U-Shaped Tube (Covered with foam) with band strap (field supply) Bind all optional cables and cords with this bands. Bind all power supply cords to the Tube (Covered with foam) with band strap (field supply) Apply cut Guide all the Bushing 7...
  • Page 41 8. External Controller shall be connected to 1-pole switch with min 3.0mm contact gap. (connection refer to Diagram 4.2). Its cable must be (2 × min 0.5 mm ), double insulation layer of PVC-sheathed or polychloroprene sheathed cable. * note: - When making such connection, kindly remove the jumper between terminal no. 17 and 18. - Switch used shall be CE compliance component.
  • Page 42 The equipment’s power supply 2 complies with IEC/EN 61000-3-2.  The equipment’s power supply 2 complies with IEC/EN 61000-3-3 and can be connected to current supply network. For model WH-MHF12G9E8:  The equipment’s power supply 1 complies with IEC/EN 61000-3-2. ...
  • Page 43 Tabs Lower case Lower case Medium-sized square outlet box (obtain locally) Part No. DS3744 (Panasonic Co., Ltd.) or equivalent. Secure the remote control lower case to the outlet box with the two accessory screws (3). Make sure that the lower case is flat against the wall at this time, with no bending.
  • Page 44 B. If Remote Control Cable Is Exposed Use nipper to cut a notch at the upper case. Install the remote control lower case to the (Select the intended feeding-out position) wall with the two accessory screws (4). Route the remote control cable (2) inside the Fasten the screws properly until screw head is lower case in accordance with the intended lower than the rib and reach the base of...

  • Page 45: Checking And Test Run Procedures

    11.5 Checking and Test Run Procedures WARNING Be sure to switch off all the power supply before performing each of the below action. Remove The Cabinet Front Plate (1) Remove the 5 mounting screws as shown in the illustration. (2) Slide the cabinet front plate downward to release the pawls.

  • Page 46: Operation And Control

    12. Operation and Control 12.1 Basic Function Inverter control, which equipped with a microcomputer in determining the most suitable operating mode as time passes, automatically adjusts output power for maximum comfort always. In order to achieve the suitable operating mode, the microcomputer maintains the set temperature by measuring the temperature of the environment and performing temperature shifting.
  • Page 47 Heat Mode Operation Time Chart...
  • Page 48 12.1.3 Tank Mode Operation Control contents:  3 ways valve direction 3 ways valve switch to tank side during Tank Thermo ON condition. Switch 3 ways valve to room side when tank achieve Tank Thermo OFF temperature and SOLAR turn ON condition. ...
  • Page 51 12.1.4 Heat + Tank Mode Operation Setting 1: When Heating priority is set by control panel: 1. 3 ways valve control: o 3 ways valve switch to room side during External Room Thermo ON OR Solar 3 ways valve ON OR Tank Thermo OFF time, and switch to tank side at External Room Thermo OFF AND Solar 3 ways valve OFF.
  • Page 52 Characteristic of heat pump thermo ON/OFF under tank side condition Water Outlet Thermo condition Heat pump THERMO OFF TEMP: 1. Heat pump THERMO OFF TEMP = 63°C + [+4°C]. 2. Water outlet temperature > Heat pump THERMO OFF TEMP for continuous 90 seconds, heat pump OFF and water pump continue ON.
  • Page 53 Heat + Tank Mode (Heating priority set) Under Solar Priority Set Condition: Under Solar Priority Not Set Condition:...
  • Page 54 Setting 2: When heating priority is not set by control panel:  When Solar Priority is set/not set by control panel: 1. 3 ways valve control: 3 ways valve switch to room side during heating heat-up interval, and switch to tank side during tank heat-up interval.
  • Page 55 Characteristic of heat pump thermo ON/OFF under tank side condition Water Outlet Thermo condition Heat pump THERMO OFF TEMP: 1. Heat pump THERMO OFF TEMP = 63°C + [+4°C] 2. Water outlet temperature > Heat pump THERMO OFF TEMP for continuous 90 seconds, heat pump OFF but water pump continue ON.
  • Page 59 12.1.5 Setting Water Outlet Temperature for Heat Mode  The set temperature defines the parameters for the outdoor ambient temperature dependent operation of the unit. Where by the internal water setting temperature is determined automatically depending on the outdoor temperature. The colder outdoor temperatures will result in warmer water and vice versa. The user has the possibility to shift up or down the target water temperature by control panel setting.
  • Page 60 12.1.6 Water Temperature Thermo Shift Setting  Switchs are ignored during “PUMPDW” = ON.  Switchs are ignored during “STATUS” = ON. ▲ ▼  “ ”, “ ”, ”SELECT” switch are ignored if “SETTING” = OFF.  “CANCEL” switch is ignored if “SETTING” = OFF & “STATUS” = OFF. ...

  • Page 61: Water Pump

    12.2 Water Pump 12.2.1 Water Pump Control  Once the indoor unit is ON, the water pump will be ON immediately and no error judgement for 9 minutes. However, during this 9 minutes operation, if there is any abnormality cause at outdoor or malfunction, the compressor should be OFF immediately and restart delay after 3 minutes.
  • Page 62 12.2.2 A-class Pump Specification Power for drive DC280-373V Pump Power for control DC15±10% Control Signal DC0V-DC6V Feedback Speed (puls signal) 4puls/rotation Control signal is analog voltage (DC0V-6V) generated by microcomputer PWM port. Microcomputer can change analog voltage by changing PWM duty. 12.2.3 Water Flow Rate Setting ...

  • Page 63: Pump Down Operation [Service Mode: 01]

    12.2.4 Water Pump Speed Feedback Error  Basically pump speed feedback is control by micon.  When pump speed is below low limit or over high limit for a few seconds, micon detect pump error and system is stopped.  Error detection conditions: ...

  • Page 64: Indoor Unit Safety

    12.5 Indoor Unit Safety 12.5.1 Indoor Unit Safety Control When water pump is ON, the system will start checking flow switch status (ON/OFF). If the flow switch ON for 10 seconds, the system will check on the water inlet temperature for 10 seconds. If the water inlet temperature not exceeds 80°C, the water pump shall be continuously running with normal mode.

  • Page 65: Indoor Back-Up Heater Control

    12.8 Indoor Back-Up Heater Control 12.8.1 Indoor Electric Heater Control Normal Heating Mode Heater On condition: a. Heater switch is ON b. After Heatpump thermo ON for [30] mins c. After water pump operate [9] mins d. Outdoor air temperature < Outdoor set temperature for heater e.

  • Page 66: Tank Booster Heater Control

    12.9 Tank Booster Heater Control 12.9.1 Tank Booster Heater Control Heating operation condition: Heater OFF Tank set temperature + Tank set temperature + [-5°C] [+2°C] Heater ON Booster heater Turn On condition: After BOOSTER HEATER DELAY TIMER fulfill during heatpump startup time in tank mode, or during switching from heating heat-up interval to tank heat-up interval in heat + tank mode (heating priority not set).

  • Page 67: Sterilization Mode

    12.11 Sterilization Mode  Purpose: To sterilize water tank by setting the required boiling temperature.  Control start condition: Tank connection menu is set to YES by control panel. Sterilization menu is set to YES by control panel. Sterilization signal received from control panel by timer. ...

  • Page 68: Anti Freeze Control

    12.13 Anti Freeze Control  Anti freeze protection control menu can be set YES or NO by control panel.  In heatpump system, there are 3 types of anti freeze control: 1. Expansion tank anti-freeze control  Expansion tank anti freeze heater ON condition: Outdoor ambient temp.

  • Page 69: Solar Operation (Optional)

    12.14 Solar Operation (Optional) 12.14.1 Solar Operation: External solar heat source signal can be connect to unit for proper control of heat source switching during tank boiling time. Control according to preset whether solar priority is set or not. When tank connection is NOT set at SETTING mode, solar operation is disabled. When Pump A (from solar pump station) is detected On through connection Y3 and Y4, then the Solar pump 3 Way Valve is requested ON (Refer to figure below).
  • Page 70 Solar Operation Chart in different mode and condition Tank Mode (Solar Priority SET condition) Tank Mode (Solar Priority NOT SET condition)
  • Page 71 Heat + Tank Mode (Heating Priority NOT SET) (Solar Priority SET condition) When solar 3 way valve turn on during Tank interval, cancel Tank interval immediately and switch 3-way valve to the After heating/cooling interval, stand by to go in tank side after solar 3 way room side and start a heating/cooling interval.

  • Page 72: External Room Thermostat Control (Optional)

    12.15 External Room Thermostat Control (Optional) Purpose: Better room temperature control to fulfill different temperature request by external room thermostat. Recommended external room thermostat: Maker Characteristic Siemen (REV200) Touch panel Siemen (RAA20) Analog Connection of external room thermostat: Wire Connection and thermo characteristic of Siemen REV200: Setting L/L1 (H) Heat Thermo...

  • Page 73: Three Ways Valve Control

    12.16 Three Ways Valve Control Purpose: - 3 ways valve is used to change flow direction of hot water from heat pump between heating side and tank side. Control contents: 3 ways valve switch Off: During 3 ways valve switch Off time, the hot water will provide heat capacity to heating side. 3 ways valve switch On: During 3 ways valve switch On time, the hot water will provide heat capacity to tank side.

  • Page 74: External Off/On Control

    12.18 External OFF/ON Control  Communication circuit between indoor unit and external controller is as per below. Panasonic 12V_4 External Controller 0.01µ G2 G2 CN-THERMO  Maximum length of communication cable is 20 meter.  Control content: External Control Switch...

  • Page 75: Holiday Mode

    12.19 Holiday Mode  Purpose: Promotes energy saving by allowing the user to stop the system during holiday and enables the system to resume at the preset temperature after holiday.  Control details: Range of days can be set in holiday mode is from 1 to 999 days. After days of holiday have been set, heat pump will stop and only resume operation at 12.00am at the end of holiday countdown.

  • Page 76: Protection Control

    13. Protection Control 13.1 Protection Control for All Operations 13.1.1 Time Delay Safety Control The compressor will not start for three minutes after stop of operation. 13.1.2 30 Seconds Forced Operation Once the compressor starts operation, it will not stop its operation for 30 seconds. However, it can be stopped using control panel at indoor unit.
  • Page 77 13.1.6 Low Frequency Protection Control 2  When all the below conditions comply, the minimum compressor frequency will change to lower frequency. Temperature, T, for: Heating Outlet water (°C) T < 14 or T ≥ 48 Outdoor air (°C) T < 4 or T ≥ 24 Indoor heat exchanger (°C) T ≥...

  • Page 78: Protection Control For Heating Operation

    13.2 Protection Control for Heating Operation 13.2.1 Outdoor Air Temperature Control The maximum current value is regulated when the outdoor air temperature rises above 14°C in order to avoid compressor overloading. 13.2.2 Deice Operation When outdoor pipe temperature and outdoor air temperature is low, deice operation start where outdoor fan motor stop.

  • Page 79: Servicing Mode

    14. Servicing Mode 14.1 Remove The Cabinet Front Plate 1. Remove the 5 mounting screws as shown in the illustration. 2. Slide the cabinet front plate downward to release the pawls. Then, pull it toward front to remove it. Cabinet Front Plate Mounting screws Mounting screws...

  • Page 80: How To Adjust Water Flow Rate

    The default setting is SPEED 4 (Only for WH-MHF09G3E8) and SPEED 5 for WH-MHF12G9E8. Please ensure the minimum flow rate is not less than 13 l/min and not more than 50 l/min. The available external static pressure (kPa) in function of the water flow rate (l/min) is shown in the P-Q graph.

  • Page 81: Dry Concrete [Service Mode: 03]

    14.6 Dry Concrete [SERVICE MODE: 03]  If Dry Concrete has been set, Dry Concrete status can be activated and monitored by following procedure. Press SERVICE button for 5 seconds. Press ▲ to enter menu Sr: 03 and press SET button to activate Dry Concrete function. Press OFF/ON button to quit setting.

  • Page 82: Maintenance Guide

    15. Maintenance Guide In order to ensure optimal performance of the unit, seasonal inspections on the unit, external filter and field wiring have to be carried out at regular intervals. This maintenance should be carried out by authorized dealer. 1. Water pressure Water pressure should not lower than 0.05 MPa (with inspects the pressure gauge).
  • Page 83 WARNING Be careful not to touch parts other than RCCB/ELCB test button when the power is supplied to Indoor Unit. Else, electrical shock may happen. Push the “TEST” button on the RCCB/ELCB. The lever would turn down and indicate “0” and indicate green colour if it functions normal.

  • Page 84: Troubleshooting Guide

    16. Troubleshooting Guide 16.1 Refrigeration Cycle System In order to diagnose malfunctions, make sure that there are no electrical problems before inspecting the refrigeration cycle. Such problems include insufficient insulation, problem with the power source, malfunction of a compressor and a fan.

  • Page 85: Relationship Between The Condition Of The Mono Bloc Unit And Pressure And Electric Current

    16.2 Relationship Between The Condition Of The Mono Bloc Unit And Pressure And Electric Current Heating Mode Condition of the Mono Bloc Unit Low Pressure High Pressure Electric current during operation Water leakage or insufficient water flow rate in the system Excessive amount of refrigerant Inefficient compression Insufficient refrigerant...

  • Page 86: Breakdown Self Diagnosis Function

    16.3 Breakdown Self Diagnosis Function 16.3.1 Self Diagnosis Function (Three Digits Alphanumeric Code)  When abnormality occur during operation, the system will stop operation, and OFF/ON remote control LED will blink and error code will display on the remote control Timer display LCD. ...

  • Page 87: Error Codes Table

    16.4 Error Codes Table Diagnosis display Abnormality/Protection control Abnormality Judgement Primary location to verify No abnormality detected — —  Indoor/outdoor connection wire  Indoor/outdoor PCB Indoor/Outdoor capacity unmatched 90s after power supply  Specification and combination table in catalogue ...
  • Page 88 Diagnosis display Abnormality/Protection control Abnormality Judgement Primary location to verify  Water inlet temperature sensor Indoor water inlet temperature sensor Continue for 5 sec. abnormality (defective or disconnected)  Outdoor discharge pipe temperature Outdoor discharge pipe temperature Continue for 5 sec. sensor abnormality sensor (defective or disconnected) 4 times occurrence within 10...

  • Page 89: Self-Diagnosis Method

    16.5 Self-diagnosis Method 16.5.1 Connection Capability Rank Abnormality (H12) Malfunction Decision Conditions: During startup operation of heating, the capability rank of indoor checked by the outdoor is used to determine connection capability rank abnormality. Malfunction Caused: Wrong model interconnected. Wrong indoor unit or outdoor unit PCB (main) used. Faulty indoor unit or outdoor unit PCB (main).
  • Page 90 16.5.2 Compressor Tank Temperature Sensor Abnormality (H15) Malfunction Decision Conditions: During startup and operation of heating, the temperatures detected by the compressor tank temperature sensor are used to determine sensor error. Malfunction Caused: Faulty connector connection. Faulty sensor. Faulty outdoor unit PCB (main). Abnormality Judgment: Continue for 5 seconds.
  • Page 91 16.5.3 Water Pump Abnormality (H20) Malfunction Decision Conditions: During startup and operation of cooling and heating, the rotation speed detected by the IPM of water pump motor during water pump operation is used to determine abnormal water pump (feedback of rotation > 6,000rpm or < 1,000rpm).
  • Page 92 16.5.4 Indoor Refrigerant Liquid Temperature Sensor Abnormality (H23) Malfunction Decision Conditions: During startup and operation of heating, the temperatures detected by the indoor refrigerant liquid temperature sensor are used to determine sensor error. Malfunction Caused: Faulty connector connection. Faulty sensor. Faulty indoor unit PCB (main).
  • Page 93 16.5.5 Service Valve Error (H27) Malfunction Decision Conditions: During cooling operation, when:- [a] Indoor refrigerant pipe temperature at compressor startup - present indoor refrigerant pipe temperature < 2°C [b] Present high pressure - high pressure at compressor startup < 5kg/cm² **Judgment only for first time cooling operation and not during pump down operation.
  • Page 94 16.5.6 Compressor Low Pressure Protection (H42) Malfunction Decision Conditions: During operation of heating and after 5 minutes compressor ON, when outdoor pipe temperature below -29°C or above 26°C is detected by the outdoor pipe temperature sensor. Malfunction Caused: Dust accumulation on the outdoor unit heat exchanger. Air short circuit at outdoor unit.
  • Page 95 16.5.7 Water Flow Switch Abnormality (H62) Malfunction Decision Conditions: During operation of heating, the water flow detected by the indoor water flow switch is used to determine water flow error. Malfunction Caused: Faulty water pump. Water leak in system. Faulty connector connection. Faulty water flow switch.
  • Page 96 16.5.8 Outdoor Low Pressure Abnormality (H63) Malfunction Decision Conditions: During operation of heating, when the outdoor low pressure sensor output signal is 0Vdc or 5Vdc. Malfunction Caused: Faulty connector connection. Faulty sensor. Faulty outdoor unit PCB (main). Abnormality Judgment: Continue 4 times in 20 minutes.
  • Page 97 16.5.9 Outdoor High Pressure Abnormality (H64) Malfunction Decision Conditions: During operation of heating, when the outdoor high pressure sensor output signal is 0Vdc or 5Vdc. Malfunction Caused: Faulty connector connection. Faulty sensor. Faulty outdoor unit PCB (main). Abnormality Judgment: Continue 4 times in 20 minutes.
  • Page 98 16.5.10 Indoor Backup Heater OLP Abnormality (H70) Malfunction Decision Conditions: During operation of indoor backup heater, when no power supplies to indoor backup heater or OLP open circuit. Malfunction Caused: Faulty power supply connector connection. Faulty connector connection. Faulty indoor backup heater overload protector (OLP). Faulty indoor unit PCB (main).
  • Page 99 16.5.11 Tank Temperature Sensor Abnormality (H72) Malfunction Decision Conditions: When tank connection is set to ON, the temperatures detected by the tank temperature sensor are used to determine sensor error. Malfunction Caused: Faulty connector connection. Faulty sensor. Faulty indoor unit PCB (main). Abnormality Judgment: Continue for 5 seconds.
  • Page 100 16.5.12 Indoor-Control Panel Communication Abnormality (H76) Malfunction Decision Conditions: During standby and operation of heating, indoor-remote control error occur. Malfunction Caused: Faulty connector connection. Faulty remote control. Faulty indoor unit PCB (main).
  • Page 101 16.5.13 Indoor/Outdoor Abnormal Communication (H90) Malfunction Decision Conditions: During operation of heating, the data received from outdoor unit in indoor unit signal transmission is checked whether it is normal. Malfunction Caused: Faulty outdoor unit PCB (main). Faulty indoor unit PCB (main). Indoor-outdoor signal transmission error due to wrong wiring.
  • Page 102 16.5.14 Tank Booster Heater OLP Abnormality (H91) Malfunction Decision Conditions: During operation of tank booster heater, and tank booster heater OLP open circuit. Malfunction Caused: Faulty connector connection. Faulty tank booster heater overload protector (OLP). Faulty indoor unit PCB (main). Abnormality Judgment: Continue for 60 seconds.
  • Page 103 16.5.15 Unspecified Voltage between Indoor and Outdoor (H95) Malfunction Decision Conditions: The supply power is detected for its requirement by the indoor/outdoor transmission. Malfunction Caused: Insufficient power supply. Faulty outdoor unit PCB (noise filter/main).
  • Page 104 16.5.16 Outdoor High Pressure Protection (H98) Malfunction Decision Conditions: During operation of heating, when pressure 4.0 MPa and above is detected by outdoor high pressure sensor. Malfunction Caused: Faulty water pump. Insufficient water flow rate in system. Water leak in system. 2/3 way closed.
  • Page 105 16.5.17 Indoor Freeze-up Protection (H99) Malfunction Decision Conditions: During anti-freezing control in cooling operation, when the indoor refrigerant liquid temperature < 0°C. Malfunction Caused: Faulty water pump. Insufficient water flow rate in system. Water leak in system. 2 way valve partially closed. Clogged expansion valve or strainer.
  • Page 106 16.5.18 Outdoor High Pressure Switch Activate (F12) Malfunction Decision Conditions: During operation of heating, when pressure 4.5MPa and above is detected by outdoor high pressure switch. Malfunction Caused: Dust accumulation on the outdoor unit heat exchanger. Air short circuit at outdoor unit. Faulty water pump.
  • Page 107 16.5.19 Compressor Rotation Failure (F14) Malfunction Decision Conditions: A compressor rotation failure is detected by checking the compressor running condition through the position detection circuit. Malfunction Caused: Compressor terminal disconnect. Faulty outdoor unit PCB (main). Faulty compressor. Abnormality Judgment: Continue 4 times in 20 minutes.
  • Page 108 16.5.20 Outdoor Fan Motor (DC Motor) Mechanism Locked (F15) Malfunction Decision Conditions: The rotation speed detected by the Hall IC of the fan motor during fan motor operation is used to determine abnormal fan motor (feedback of rotation > 2550rpm or < 50rpm). Malfunction Caused: Operation stop due to short circuit inside the fan motor winding.
  • Page 109 16.5.21 Input Over Current Detection (F16) Malfunction Decision Conditions: During operation of heating, when outdoor current above 27.9A is detected by the current transformer (CT) in the outdoor unit PCB. Malfunction Caused: Excessive refrigerant. Faulty outdoor unit PCB (main). Abnormality Judgment: Continue 3 times in 20 minutes.
  • Page 110 16.5.22 Compressor Overheating (F20) Malfunction Decision Conditions: During operation of heating, when temperature above 112°C is detected by the compressor tank temperature sensor. Malfunction Caused: Faulty compressor tank temperature sensor. 2/3 way valve closed. Refrigerant shortage (refrigerant leakage). Clogged expansion valve or strainer. Faulty outdoor unit PCB (main).
  • Page 111 16.5.23 IPM Overheating (F22) Malfunction Decision Conditions: During operation of heating, when temperature 95°C is detected by the outdoor IPM temperature sensor. Malfunction Caused: Faulty outdoor unit fan motor. Faulty outdoor unit PCB (main). Abnormality Judgment: Continue 3 times in 30 minutes.
  • Page 112 16.5.24 Output Over Current Detection (F23) Malfunction Decision Conditions: During operation of heating, when outdoor DC current is above 40.1 ± 5.0A (for: UD07~09CE) OR 44.7 ± 5.0A (for: UD12~16CE) is detected by the IPM DC Peak sensing circuitry in the outdoor unit PCB (main). Malfunction Caused: Faulty outdoor unit PCB (main).
  • Page 113 16.5.25 Refrigeration Cycle Abnormality (F24) Malfunction Decision Conditions: During operation of heating, compressor frequency > Frated. During operation of heating, running current: 0.65A < I < 1.65A. During operation of heating, indoor refrigerant liquid temperature - water inlet temperature < 5°C. Malfunction Caused: Faulty water inlet or indoor refrigerant liquid temperature sensors.
  • Page 114 16.5.26 Four Way Valve Abnormality (F25) Malfunction Decision Conditions: During heating operation, when the indoor pipe temperature of thermostat ON indoor unit < 0°C. Malfunction Caused: Faulty sensor. Faulty connector connection. Faulty outdoor unit PCB (noise filter/main). Faulty four way valve. Abnormality Judgment: Continue 4 times in 30 minutes.
  • Page 115 16.5.27 Outdoor High Pressure Switch Abnormal (F27) Malfunction Decision Conditions: During compressor stop, and outdoor high pressure switch is remain opened. Malfunction Caused: Faulty connector connection. Faulty switch. Faulty outdoor unit PCB (main). Abnormality Judgment: Continue for 1 minute.
  • Page 116 16.5.28 Indoor Water Outlet Temperature Sensor 2 Abnormality (F30) Malfunction Decision Conditions: During startup and operation of cooling and heating, the temperatures detected by the indoor water outlet temperature sensor 2 are used to determine sensor error. Malfunction Caused: Faulty connector connection. Faulty sensor.
  • Page 117 16.5.29 Outdoor Air Temperature Sensor Abnormality (F36) Malfunction Decision Conditions: During startup and operation of heating, the temperatures detected by the outdoor air temperature sensor are used to determine sensor error. Malfunction Caused: Faulty connector connection. Faulty sensor. Faulty outdoor unit PCB (main). Abnormality Judgment: Continue for 5 seconds.
  • Page 118 16.5.30 Indoor Water Inlet Temperature Sensor Abnormality (F37) Malfunction Decision Conditions: During startup and operation of heating, the temperatures detected by the indoor water inlet temperature sensor are used to determine sensor error. Malfunction Caused: Faulty connector connection. Faulty sensor. Faulty indoor unit PCB (main).
  • Page 119 16.5.31 Outdoor Discharge Pipe Temperature Sensor Abnormality (F40) Malfunction Decision Conditions: During startup and operation of heating, the temperatures detected by the outdoor discharge pipe temperature sensor are used to determine sensor error. Malfunction Caused: Faulty connector connection. Faulty sensor. Faulty outdoor unit PCB (main).
  • Page 120 16.5.32 Power Factor Correction (PFC) Abnormality (F41) Malfunction Decision Conditions: During operation of heating, when the PFC protection circuitry in the outdoor unit PCB (main) senses abnormal high DC voltage level. Malfunction Caused: Power supply surge. Compressor windings not uniform. Faulty outdoor unit PCB (main).
  • Page 121 16.5.33 Outdoor Pipe Temperature Sensor Abnormality (F42) Malfunction Decision Conditions: During startup and operation of heating, the temperatures detected by the outdoor pipe temperature sensor are used to determine sensor error. Malfunction Caused: Faulty connector connection. Faulty sensor. Faulty outdoor unit PCB (main). Abnormality Judgment: Continue for 5 seconds.
  • Page 122 16.5.34 Outdoor Defrost Temperature Sensor Abnormality (F43) Malfunction Decision Conditions: During startup and operation of heating, the temperatures detected by the outdoor defrost temperature sensor are used to determine sensor error. Malfunction Caused: Faulty connector connection. Faulty sensor. Faulty outdoor unit PCB (main). Abnormality Judgment: Continue for 5 seconds.
  • Page 123 16.5.35 Indoor Water Outlet Temperature Sensor Abnormality (F45) Malfunction Decision Conditions: During startup and operation of heating, the temperatures detected by the indoor water outlet temperature sensor are used to determine sensor errors. Malfunction Caused: Faulty connector connection. Faulty sensor. Faulty indoor unit PCB (main).
  • Page 124 16.5.36 Outdoor Current Transformer Open Circuit (F46) Malfunction Decision Conditions: A current transformer (CT) open circuit is detected by checking the compressor running frequency (≥ rated frequency) and CT detected input current (< 0.65A) for continuously 20 seconds. Malfunction Caused: CT defective.
  • Page 125 16.5.37 Cooling High Pressure Overload Protection (F95) Malfunction Decision Conditions: During operation of cooling, when pressure 4.0MPa and above is detected by outdoor high pressure sensor. Malfunction Caused: Dust accumulation in the outdoor unit heat exchanger. Air short circuit at outdoor unit. 2 way valve closed.

  • Page 126: Disassembly And Assembly Instructions

    17. Disassembly and Assembly Instructions WARNING High Voltage are generated in the electrical parts area by the capacitor. Ensure that the capacitor has discharged sufficiently before proceeding with repair work. Failure to heed this caution may result in electric shocks. WARNING Be sure to switch off all the power supply before performing each of the below action.

  • Page 127: To Remove The Cabinet Rear Plate

    17.3 To Remove The Cabinet Rear Plate 17.4 To Remove Pressure Gauge 17.5 To Remove RCCB...

  • Page 128: To Remove Transformer And Electronic Controller Board

    17.6 To Remove Transformer and Electronic Controller Board 17.7 To Remove Pressure Relief Valve and Air Purge Valve When reinstall the water pipe, use grease or water at the joining.

  • Page 129: To Remove Flow Switch

    17.8 To Remove Flow Switch When reinstall the water pipe, use grease or water at the joining. 17.9 To Remove Water Pump When reinstall the water pipe, use grease or water at the joining. 17.10 To Remove Bottle Complete When reinstall the water pipe, use grease or water at the joining.

  • Page 130: Technical Data

    18. Technical Data 18.1 Operation Characteristics 18.1.1 WH-MHF09G3E8 Heating Characteristics at Different Outdoor Air Temperature  Condition Outdoor air temperature : 7°C (DBT), 6°C (WBT) Indoor water inlet temperature : 30°C Indoor water outlet temperature : 35°C 11.000 10.000 9.000 8.000 7.000 6.000...
  • Page 131 18.1.2 WH-MHF12G9E8 Heating Characteristics at Different Outdoor Air Temperature  Condition Outdoor air temperature : 7°C (DBT), 6°C (WBT) Indoor water inlet temperature : 30°C Indoor water outlet temperature : 35°C 14.000 13.000 12.000 11.000 10.000 9.000 Outdoor Temperature (°C) 6.500...

  • Page 132: Heating Capacity Table

    2210 9000 2460 9000 2990 9000 3640 9000 1520 9000 1700 13200 1880 9000 2160 9000 2630 9000 3200 18.2.2 WH-MHF12G9E8 Water Out (°C) Input Input Input Input Input Input Outdoor Capacity Capacity Capacity Capacity Capacity Capacity Power Power Power...

  • Page 133: Exploded View And Replacement Parts List

    19. Exploded View and Replacement Parts List 19.1 (Refrigerant System)
  • Page 134 × 8...
  • Page 135 Note:  The above exploded view is for the purpose of parts disassembly and replacement.  The non-numbered parts are not kept as standard service parts.
  • Page 136 <Model: Refrigerant System> SAFETY REF. NO. DESCRIPTION & NAME QTY. WH-MHF09G3E8 WH-MHF12G9E8 REMARK BASE PAN ASS’Y (1) CWD52K1276 ← COMPRESSOR 4JD650XBA22 ← BUSHING - COMPRESSOR MOUNT CWH50055 ← NUT - COMPRESSOR MOUNT CWH561049 ← CRANKCASE HEATER CWA341053 ← CONDENSER COMPLETE CWB32C3987 ←...
  • Page 137 SAFETY REF. NO. DESCRIPTION & NAME QTY. WH-MHF09G3E8 WH-MHF12G9E8 REMARK SENSOR - COMP. (EXIT TEMP CN-TH3) CWA50C3165 ← SOUND PROOF MATERIAL CWG302598 ← SOUND PROOF MATERIAL CWG302599 ← ELECTRO MAGNETIC SWITCH K6C2AGA00002 ← ELECTRO MAGNETIC SWITCH K6C4E8A00001 ← REACTOR G0C153J00009 ←...

  • Page 138: Water System)

    19.2 (Water System)
  • Page 139 Note:  The above exploded view is for the purpose of parts disassembly and replacement.  The non-numbered parts are not kept as standard service parts.
  • Page 140 <Model: Water System> SAFETY REF. NO. DESCRIPTION & NAME QTY. WH-MHF09G3E8 WH-MHF12G9E8 REMARK BASE PAN ASS’Y (2) CWD52K1381 ← HOT WATER COIL - COMPLETE CWB90C1138 ← RECEIVER CWB141073 ← FLOW SWITCH CWB621128 ← PUMP CWB532116 ← BOTTLE COMP. CWH90C0054 ←...

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