Summary of Contents for Mitsubishi Electric CAHV-R450YA-HPB
Indicates a risk of injury or structural damage CAUTION Indicates a risk of damage to the unit or other components in the system IMPORTANT All electric work must be performed by personnel certified by Mitsubishi Electric. General WARNING Before cleaning the unit, switch off the power.
Do not pierce or burn. Be aware that refrigerants may not contain an odour. CAUTION To reduce the risk of fire or explosion, do not place To prevent environmental pollution, dispose of brine in flammable materials or use flammable sprays around the the unit and cleaning solutions according to the local unit.
Any additional parts must be installed by qualified personnel. Only use the parts specified by Mitsubishi Electric. Properly dispose of the packing materials. Plastic bags pose suffocation hazard to children. Take appropriate safety measures against wind gusts and...
Electrical wiring WARNING To reduce the risk of wire breakage, overheating, smoke, and To reduce the risk of current leakage, overheating, smoke, or fire, keep undue force from being applied to the wires. fire, use properly rated cables with adequate current carrying capacity.
Do not unnecessarily change the switch settings or When servicing the refrigerant, open and close the check touch other parts in the refrigerant circuit. joint using two spanners, as there is the risk of refrigerant leaking due to damaged piping. Doing so may change the operation mode or damage the unit.
CONTENTS I Read Before Servicing  Read Before Servicing......................3  Necessary Tools and Materials ....................4  Brazing............................5  Air Tightness Test........................6  Vacuum Drying (Evacuation) ....................7  Refrigerant Charging ........................ 9  Remedies to be taken in case of a Refrigerant Leak..............9  Characteristics of the Conventional and the New Refrigerants ..........
I Read Before Servicing  Read Before Servicing ....................... 3  Necessary Tools and Materials..................4  Brazing..........................5  Air Tightness Test ......................6  Vacuum Drying (Evacuation) ..................... 7  Refrigerant Charging......................9  Remedies to be taken in case of a Refrigerant Leak ............9  Characteristics of the Conventional and the New Refrigerants ........
1. Check the type of refrigerant used in the system to be serviced. Refrigerant Type Hot water Heat pump CAHV-R450YA-HPB:R454C 2. Check the symptoms exhibited by the unit to be serviced. Refer to this service handbook for symptoms relating to the refrigerant cycle.
[ I Read Before Servicing ]  Necessary Tools and Materials Prepare the following tools and materials necessary for servicing the unit. Tools for use with R454C (Adaptability of tools that are for use with R22 or R410A) 1. To be used exclusively with R454C (not to be used if used with R22 or R410A) Tools/Materials Notes Gauge Manifold...
[ I Read Before Servicing ]  Brazing No changes have been made in the brazing procedures. Perform brazing with special care to keep foreign objects (such as oxide scale, water, and dust) out of the refrigerant system. Example: Inside the brazed connection Use of oxidized solder for brazing Use of non-oxidized solder for brazing 1.
[ I Read Before Servicing ]  Air Tightness Test No changes have been made in the detection method. Note that a refrigerant leak detector for R22 will not detect an R454C leak. Halide torch R22 leakage detector 1. Items to be strictly observed Pressurize the equipment with nitrogen up to the design pressure (3.85MPa), and then judge the equipment's air tightness, taking temperature variations into account.
[ I Read Before Servicing ]  Vacuum Drying (Evacuation) (Photo1) 15010H (Photo2) 14010 Recommended vacuum gauge: ROBINAIR 14010 Thermistor Vacuum Gauge 1. Vacuum pump with a reverse-flow check valve (Photo1) To prevent the vacuum pump oil from flowing into the refrigerant circuit during power OFF or power failure, use a vacuum pump with a reverse-flow check valve.
[ I Read Before Servicing ] 7. Notes To evacuate air only from the outdoor units Apply a vacuum through the check joints on the low pressure sides. Evacuating the system from the high-pressure side may damage the compressor. When dry-vacuuming and recovering refrigerant, let the water circulate to keep the plate heat exchanger from freez- ing.
[ I Read Before Servicing ]  Refrigerant Charging Cylinder with a siphon Cylinder without a siphon Cylin- Cylin- Cylinder color R454C is White. Refrigerant charging in the liquid state Valve Valve liquid liquid Charge refrigerant through the Charging refrigerant through the check joint on the high-pressure side.
[ I Read Before Servicing ]  Characteristics of the Conventional and the New Refrigerants 1. Chemical property As with R22, the new refrigerant (R454C) is low in toxicity and slightly flammable refrigerant. However, because the specific gravity of vapor refrigerant is greater than that of air, leaked refrigerant in a closed room will accumulate at the bottom of the room and may cause hypoxia.
[ I Read Before Servicing ]  Precautions for handling equipment using R454C When handling the units that use R454C refrigerant, observe the following notes. (The notes are based on the precautions regarding R454C refrigerant contained in IEC 60335-2-40.) 1. General Compliance with national gas regulations shall be observed.
Where electrical components are being changed, they shall be fit for the purpose and to the correct specification. At all times the MITSUBISHI ELECTRIC's Installation Manual and Service Handbook shall be followed. If in doubt, consult the dealer's technical department for assistance.
[ I Read Before Servicing ] 8. Cabling Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse environmental effects. The check shall also take into account the effects of aging or continual vibration from sources such as compressors or fans.
5) Pump down refrigerant system, if possible. 6) Make sure that cylinder is situated on the scales before recovery takes place. 7) Start the recovery machine and operate in accordance with MITSUBISHI ELECTRIC's instructions. 8) Do not overfill cylinders. (No more than 80% volume liquid charge) 9) Do not exceed the maximum working pressure of the cylinder, even temporarily.
[ I Read Before Servicing ] 4) Discharge capacitors in a way that won't cause any spark. The standard procedure to short circuit the capacitor terminals usually creates sparks. 5) Reassemble sealed enclosures accurately. If seals are worn, replace them. 6) Check safety equipment before putting into operation.
[ I Read Before Servicing ] 16. Installation restrictions Do not install the unit where combustible gas may leak. - If combustible gas accumulates around the unit, fire or explosion may result. • Provide sufficient space around the unit for effective operation, efficient air movement, and ease of access for maintenance.
[ I Read Before Servicing ] 17. Regulatory requirements for safety See below for information on installing a safety device. Safety devices shall be regularly inspected, maintained, and replaced in accordance with relevant laws, regulations, and the instructions of the manufacturers.
[ I Read Before Servicing ]  Notes on Refrigerating Machine Oil 1. Refrigerating machine oil in the HFC refrigerant system HFC type refrigerants use a refrigerating machine oil different from that used in the R22 system. Note that the refrigerants machine oil used in the system has properties that are different from commercially available refrig- erants machine oil.
II Restrictions  System Configuration....................... 21  Types and Maximum allowable Length of Cables ............22  Main Power Supply Wiring and Switch Capacity ............. 23  Sample Installation......................27  Switch Types and the Factory Settings................28  Configuring the Settings....................29  Water Pipe Installation .....................
[ II Restrictions ]  System Configuration II Restrictions Schematic Diagrams of Individual and Multiple Systems (1) Individual system * Each unit is operated individually by connecting a dry contact switch/relay to each unit. External External Sub box Sub box temperature temperature (TB3)
[ II Restrictions ]  Types and Maximum allowable Length of Cables Wiring work (1) Notes 1) Have all electrical work performed by an authorized electrician according to the local regulations and instructions in this man- ual. 2) Install external transmission cables at least 5cm [1-31/32"] away from the power supply cable to avoid noise interference. (Do not put the control cable and power supply cable in the same conduit tube.) 3) Provide grounding for the outdoor unit as required.
6. Do not install a phase advancing capacitor on the motor. Doing so may damage the capacitor and result in fire. 7. Use the breakers that match the unit capacity (leakage current limit, current breaking threshold, etc.). 8. Select the type of breaker for an inverter circuit as an earth leakage breaker. (Mitsubishi Electric NV-S series or its equivalent) 9.
[ II Restrictions ] Caution: • Some installation sites may require an installation of an earth leakage breaker for the inverter. If no earth leakage breaker is installed, there is a danger of electric shock. • Only use properly rated breakers and fuses. Using a fuse or wire of the wrong capacity may cause malfunction or fire.
[ II Restrictions ] <1> Schematic Diagram of a Unit and Terminal Block Arrangement To remove the front panel of the control box, unscrew the four screws and pull the panel forward and then down. Transmission terminal block Power supply terminal block Cable strap Control terminal...
[ II Restrictions ] <2> Installing the conduit tube • Punch out the knockout hole for wire routing at the bottom of the front panel with a hammer. Knockout hole • When putting wires through knockout holes without protecting them with a conduit tube, deburr the holes and protect the wires with protective tape.
[ II Restrictions ]  Sample Installation (1) Individual system *Each unit is operated individually by connecting a dry contact switch/relay to each unit. External External Sub box Sub box temperature temperature (TB3) (TB3) sensor sensor Field-supplied dry Field-supplied dry contact switch/relay contact switch/relay or remote controller...
[ II Restrictions ]  Switch Types and the Factory Settings (1) Switch names and functions Discharge air outlet Control box Service panel Intake air inlet Water outlet Sub box Water inlet Service panel There are four main ways to set the settings as follows: 1Dip switches (SW4 - SW7) 2Dip switches used in combination with the push switches 3Rotary switches...
[ II Restrictions ]  Configuring the Settings The settings must be set only by a qualified personnel. <1> Making the settings Use the LED display and the three push switches (SWP1 ( ), SWP2 ( ), and SWP3 (Enter)) to change the current settings on the circuit board and to monitor various monitored values.
[ II Restrictions ] (2) Table of settings items Set the dip switches SW5 and SW6 as shown in the table below to set the value for the items in the "Setting item" column. SW5 and SW6 settings Item Setting Item Code SW5-1 SW6-8...
[ II Restrictions ] (3) System configuration procedures: Individual system 1. Set the dip switches on the control board. Unit Switch settings on the control board LD301 Set the dip switches (labeled A in the figure at right) that correspond to the items SWU2 SWU1 below, according to the local system.
[ II Restrictions ] 4. Perform an initial setup. (1) Set dip switches SW7-1, -2, -3, and -4 to ON (labeled A in the figure at Unit right). LD301 [EEEE] will appear in LD301 (labeled B in the figure at right). *1 SWU1 SWU2 (2) Press and hold the push switch (SWP3) (labeled C in the figure at right)
[ II Restrictions ] Setting the switches on all sub units Sub unit (1) Set the dip switch SW5-9 to ON. (multiple unit control) (labeled A in the figure at right) LD301 (2) Set the addresses with the rotary switches. (labeled B in the figure at right). Set SWU2 SWU1 the 1's digit with SWU1, and set the 10's digit with SWU2.
[ II Restrictions ] 4. Perform an initial setup on the main unit. (1) Set dip switches SW7-1, -2, -3, and -4 to ON (labeled A in the figure at Main unit right). LD301 [EEEE] will appear in LD301 (labeled B in the figure at right). *1 SWU2 SWU1 (2) Press and hold the push switch (SWP3) (labeled C in the figure at right)
[ II Restrictions ] (5) Re-initializing the system When the settings for the items below have been changed, the system will require re-initialization. • Dip switch SW5-8 (use or non-use of an external water temperature sensor) (Re-initialization is required only for the Multiple system.) •...
[ II Restrictions ]  Water Pipe Installation 1. Schematic Piping Diagram and Piping System Components Indicates the direction of the flow. Unit Air conditioning floor heating Water side heat exchanger Union joints/flange joints Required to allow for a replacement of equipment. Thermometer Required to check the performance and monitor the operation of the units.
[ II Restrictions ] 2. Notes on pipe corrosion Water treatment and water quality control Poor-quality circulating water can cause the water-side heat exchanger to scale up or corrode, reducing heat- exchange performance. Properly control the quality of the circulating water. •...
[ II Restrictions ] (5) Suspended solids in the water Sand, pebbles, suspended solids, and corrosion products in water can damage the heating surface of the heat exchanger and cause corrosion. Install a good quality strainer (20 mesh or better) at the inlet of the unit to filter out suspended solids.
[ II Restrictions ] 3. Installing the strainer and flow switch (1) Installing the strainer Install the supplied strainer on the inlet water pipe near the unit to filter out suspended solids and prevent clogging corrosion of the heat exchanger. Install the strainer in a way that allows for easy access for cleaning, and instruct the user to clean it regularly.
[ II Restrictions ] 4. Water pipe hole size and location Water inlet <40A housing type joint> Water outlet <40A housing type joint> 1410 Water pipe groove specifications (Unit: mm) Pipe size 1-1/2B (40A) ø48.3±0.3 ø45 -0.3 8±0.3 15.9±0.3 Housing joint - 40 - HWE22020...
III Unit Components  Unit Components and Refrigerant Circuit ................ 43  Control Box of the Unit..................... 45  Unit Circuit Board......................46 - 41 - HWE22020...
[ III Unit Components ]  Unit Components and Refrigerant Circuit III Unit Components 1. Unit Components (1) Top view Frame MT assy Plate HEX assy Frame L assy Frame LR assy (2) Front and side view Panel L Pillar MF assy Panel R Fan guard assy Frame F assy...
[ III Unit Components ] 2. Refrigerant circuit Heat exchanger Four-way valve Receiver Heat exchanger Thermistor (TH1) Four-way valve Check joint (HP) Pressure sensor HP Pressure swich Pressure sensor LP Thermistor (TH2) Check joint (LP) Water side HEX. Compressor Thermistor (TH21) Thermistor (TH3) Thermistor (TH4) Strainer...
[ III Unit Components ]  Control Box of the Unit 1. Control box Fan board Control board REC board Noise filter Terminal block for power supply L1, L2, L3, N, (TB1) Note.1 INV board M-NET board 2. Sub box IO board Terminal block (TB5)
[ III Unit Components ]  Unit Circuit Board 1. Control board (MAIN board) CN61 CN601 16 VDC output Portable charger CN801 Pressure switch CN4/4A/4B 18 VDC output connestion Serial communication signal output CN332 Serial communication signal input Output 16 VDC GND(Fan board) CNDC Bus voltage input...
[ III Unit Components ] 2. M-NET board CNS2 CNIT Transmission line input/output for 12VDC input CN04 centralized control system CN102 Bus voltage input 5VDC input Power supply output for centralized control system Power supply detection output Indoor/outdoor transmission line input/output Power supply ON/OFF Grounding signal input...
[ III Unit Components ] 3. INV board CNRY CNCT1A LED102 12 VDC DC current sensor output Lit: Relay drive power is supplied GND(control board) (CT3) Unlit: Relay drive power is not supplied C100-C109 Smoothing capacitor SC-L Bus voltage output(P) SC-L1 Input(L1) SC-L2...
[ III Unit Components ] 4. Fan board F001 CN108 CN107 CNDCP DC current sensor output Bus voltage input(P) 15A 400V fuse DC current sensor output LED1 Lit: Inverter operation Blinking: Inverter error LED4 Lit: Microcomputer is energized Unlit: Microcomputer is not energized CNINV1 Inverter output CN106...
[ III Unit Components ] 6. IO board CN908 12VDC input CN301 Signal input from Control board Remote controller CNREM Voltage output at the dry contact Signal output to Control board Signal input from Control board DIP switch SW501 CN905 Water temp.
[ III Unit Components ] 7. REC board CN104 Open-phase detection circuit CN101 AC input CN102 AC input CNDC1 CN103 Bus voltage output to AC output to Control board CNDC3 Transmission power board Bus voltage output to INV board CN105 CNDC2 AC output to IO board Bus voltage output to Control board...
[ IV Remote Controller ]  Using the Remote Controller IV Remote Controller <1> Power ON/OFF Unit1 Press the [ON/OFF] button. During operation The ON/OFF lamp will light up in green, and the operation will start. Unit1 Pressing the [ON/OFF] button brings up a confirmation screen. When it appears, press the [F3] button.
[ IV Remote Controller ] <3> Using Weekly timer Function description Following settings can be used to change the operating schedule according to the day of the week. • Set the schedule for ON/OFF, operation mode and set temperature for each day of the week. Button operation Select "Weekly timer"...
[ IV Remote Controller ] In the Operation setting screen, press the [F1] button to move the cursor to Unit1 "Schedule". Power Save Press the [F3] button to select "Yes". Schedule Fan Mode Normal Anti-freeze Next <4> Using Period timer Function description Following settings can be made to change the specified period and daily operating schedule.
[ IV Remote Controller ] The pattern setting screen will be displayed. Unit1 * Refer to the section on Weekly timer for details on using the pattern setting screen. Anti-Freeze Heating Weekly timer operation will be disabled in the following situations: •...
[ IV Remote Controller ] <6> Using Power Save Function description Power Save is a function that regulates the compressor rotation count either daily or according to a specified period and according to a preset time interval or regulated capacity. Use this function when you want to inhibit electric power use. A typical scenario where Power Save can be used to inhibit the power consumption for water heating would be periods of particularly heavy operating loads for air conditioning and other equipment, such as periods when large numbers of people check in at a hotel or similar accommodation facility.
[ IV Remote Controller ] • To use demand control on the connected units, make the settings as shown below. (a) To use only connected unit demand control (contact input) without using Power Save on the remote controller Button operation In the Operation setting screen, press the [F1] button to move the cursor to Unit1 Power Save.
[ IV Remote Controller ] Button operation From the Main menu, select "Schedule" > "Power Save" and press the [Select] Unit1 button. Weekly timer Period timer Power Save Press the [F3] button to proceed to the settings screen. Unit1 Period You can set 2 types of pattern, as necessary.
[ IV Remote Controller ] In the Operation setting screen, press the [F1] button to move the cursor to Unit1 Power Save. Power Save Press the [F3] button to select "Yes". Schedule Fan Mode Normal Anti-freeze Next <7> Function setting Function description Sets the functions for each connected unit from the remote controller as required.
[ IV Remote Controller ] <8> Operation status monitoring Function description Check the running information of each unit from the remote controller Button operation Select "Running information" from the main menu screen, and press the [Select] button. Set the desired M-NET address with the [F2] and [F3] buttons, and press the [Select] button.
[ V Electrical Wiring Diagram ] When using a local controller, refer to the table below for the types of input/output signals that are available and the operations that correspond to the signals. External Input/Output Input Dry contact ON (Close) OFF (Open) Terminal block/connector...
[ V Electrical Wiring Diagram ] IO Board Error display output Operation display output Pump operation command output CAUTION: High voltage External water temperature sensor (option) TH15 External water temperature sensor (option) TH14 Anti freeze Fan mode Mode change1 Pump interlock Optional remote controller connecting terminal Error display output/Operation display output Wire color...
[ VI Refrigerant Circuit ]  Principal Parts and Functions Outdoor unit Part Symbols Notes Usage Specifications Check method name (functions) Com- Adjusts the amount of circulat- Low-pressure shell scroll pres- (Comp) ing refrigerant by adjusting the compressor operating frequency based on the operating pressure data High PSH1...
[ VI Refrigerant Circuit ] Part Symbols Notes Usage Specifications Check method name (functions) Thermi Detects low pressure drop Degrees Celsius Resistance check stor (Suction) = 15kohm = 3385 Controls defrosting during 0/80 R = 15 3385 (Compressor heating operation shell tempera- ture) 0°C[32°F] :15kohm...
[ VII Control ]  Functions and Factory Settings of the Dip switches VII Control 1. Factory Switch Settings (Dip switch settings table) Factory setting Setting Function Usage Circuit board OFF setting ON setting timing Depends on Model setting Leave the setting as it is. At a reset the unit The outside temperature...
[ VII Control ] 2. Slide switch (SWS1) settings Individual system SWS1 Setting Unit Operation REMOTE Follows the input signal fed through a dry contact interface or controllers Ignores the signal input LOCAL Follows the input signal Multiple system SWS1 Setting Unit Operation Main unit Sub unit...
[ VII Control ] Priority order of the water-temperature-setting-input-signal sources Water temperature can be controlled by using the signals from the four types of input sources listed below. The setting for the item with higher priority will override the settings for the items with lower priorities. The water temperature will be controlled according to the temperature setting in the "Target water temperature"...
[ VII Control ] Water-temperature setting Different water temperature settings can be set for different modes. Use item codes 11, 13, 22, 23, 24, or 25 to set the water temperatures. - 82 - HWE22020...
[ VII Control ] (1) Setting procedures Set the dip switches on the circuit board as follows before making the settings for the items described in this section. Step 0 Set SWS1 to OFF from the remote controller or with the local switch. Most settings (other than item codes 11 and 13 (water temperature setting)) cannot be Set the ON/OFF changed unless the ON/OFF setting is set to OFF.
[ VII Control ] (2) Scheduled operation Up to three sets of start/end times can be assigned for each day. To operate the units according to the schedule, set the item code 5 to "1", and set the time for item codes 1 and 6 through 9.
[ VII Control ] [When the operation Start/End times do not overlap] Operation Period 1 Operation Period 1 Operation Period 2 Operation Period 2 Operation Period 3 Operation Period 3 Target water temp. Item code 1219 setting Item code 1220 setting Item code 1218 setting Operation command signal...
[ VII Control ] (3) Selecting the preset temperature for different operation periods Setting procedures Step 0 Set SWS1 to OFF from the remote controller or with the local switch. Settings cannot be changed unless the ON/OFF setting is set to OFF. * Set the ON/OFF switch (SWS1) to OFF.
[ VII Control ] Selecting the preset temperature for different operation periods When operating the units on schedule, preset temperatures can be selected from A, B, or C for time periods 1 through 3. Item code 1218: Operation time setting 1 Item code 1215: Preset temp.
[ VII Control ] (4) Peak-demand control operation Peak-demand control is a function used to control the power consumptions of the units during peak-demand hours. The number of units in operation and the compressor's maximum operating frequency will be controlled according to the peak-demand control signal.
[ VII Control ] (5) Setting the total number of units for a multiple system Step 0 Set SWS1 to OFF from the remote controller or with the local switch. Settings cannot be changed unless the ON/OFF switch is set to OFF. Set the ON/OFF switch (SWS1) to OFF.
[ VII Control ] (6) Selecting the item that normally appears on the LED Display content Displays the operation mode.(*1) Displays the operation mode.(*2) Displays the current water temperature. Displays the water-temperature setting. Displays the high and low refrigerant pressures. (*1) The dot lights up when the operation signal is on.
[ VII Control ] (7) Remote water temperature setting input signal type By setting SW5-7 to ON, external analog signals can be used to set the water temperatures. Analog input type can be selected from the following four types: "0": 4-20 mA "1": 0-10 V "2": 1-5 V "3": 2-10 V...
[ VII Control ] (8) Setting the water temperature using analog signal input • When dip switch SW5-7 is set to ON (Enable external input) and item code 1051 is set to "0", the target water temperature varies with the preset temperatures A and B and the type of analog input signal. •...
[ VII Control ] (9) Setting the capacity control ratio using analog signal input • When dip switch SW5-7 is set to ON (Enable external input) and item code 1051 is set to "1", the capacity control ratio varies with the type of analog input signal. •...
[ VII Control ] (10) Setting the booster heater 1 operation conditions A temperature at which the booster heater 1 will go into operation (TWL) can be selected. Select item code 1057 and 1058 to set the threshold temperature (TWL1 and TAL1) for booster heater operation. Booster heater 1 operation conditions •...
[ VII Control ] Step 2 Select the item to be set with push switch SWP3. Step 3 Change the values with push switches SWP1 ( ) or SWP2 ( ). Select item code 1057 and 1058 to set the operation temperature (TWL1 and TAL1) for the booster heater 1. Press push switch SWP3 to select the item code.
[ VII Control ]  Operating characteristics and Control Capabilities Outline of Control Method -1- Operating characteristics Function Component Symbol Control/ Unit Trigger condition Detection tion Unit Pressure High-pressure 63H1 HP 63H1 (2.95) protection switch switch OFF MPa 3.85 -0.15 High-pressure PSH1 HP PSH1...
[ VII Control ] Startup seq uence rotation -2- Initial control When the power is turned on, the initial processing of the microcomputer is given top priority. During the initial processing, processing of the operation signal is suspended and is resumed after the initial processing is completed.
[ VII Control ] Control at Start-up -4- Defrost operation 1. Defrost start The defrost cycle will start when one of the following conditions 1 through 4 is met. Defrost operation will be performed in the circuit that meets the defrost-start condition below. Defrost-start conditions 1 1) Three minutes have passed since the compressor started 2) Cumulative compressor operation time after the completion...
[ VII Control ] Bypass Control -5- Outdoor unit fan The fan's rotation speed will be controlled to approximate the values in the table below that are obtained based on the outside temperature and the low pressure. (Pressures and temperatures will be monitored, and the fan frequency will change accordingly in three steps.) Fan rotation Frequency (Hz) Outdoor temp.(A)
[ VII Control ] -7- LEV in the main circuit Operating range of the LEV The opening range of the LEV1 is between 100 and 2000 (fully open). The opening range of the LEV3 is between 41 and 3000 (fully open). At startup For one minute and thirty seconds after startup, the valve will be fixed to the Initial Setting.
[ VII Control ] -9- Anti-short-cycling protection The unit has a 3-minute restart-delay function to protect the compressor from short-cycling. This function is effec- 3-minute restart delay function The 3-minite restart-delay function will tive even after a power failure. be triggered in the following situations: (1) The setting for the SWS1 (Local, Off, Remote) was changed, or (2) after Min.
[ VII Control ] Control at Initial Start-up -10- Peak-demand control General idea about demand control in the system with a combination of a heat pump and a combustion-type hot water boiler. 1. Individual system Preset value 2. Peak-demand control in a multiple system Standard operation >...
[ VII Control ] 3. Operating characteristics Maximum operating frequency of the compressor (Outlet water temperature: 70 ºC) Capacity mode COP priority mode °CDB Outside temp. - 103 - HWE22020...
[ VII Control ] Emergency Op eration Mode -11- Multiple system control 1. Electrical wiring diagram External temperature sensor Sub box (TB3) (TB3) (TB3) MAIN unit SUB unit SUB unit(s) Field-supplied dry "n"th unit contact switch/relay or remote controller Inter-unit wiring Inter-unit wiring (M-NET line) (M-NET line)
[ VII Control ] Control Method -12- Automatic operation of pump for freeze-up protection 1. Purpose This is a function to protect the water circuit from freezing up in winter. 2. Pump wire connection Control board I/O Box CN511 X704 X703 CN513 7 6 5...
[ VII Control ] Cooling/heating Circuit Control and General Function of System Equipment -13- Water-temperature control Water temperature can be controlled in the following three ways. Select one that works best. Switch Factory setting Outlet-water-temperature-based control SW6-3 Inlet-water-temperature-based control Water temperature control based on the SW5-8 external water temperature reading SW6-3...
[ VII Control ] 2. Normal Thermo-ON/OFF operations DIFF1 = 2 ºC (Initial setting): “1015” Digitally set value DIFF2 = 2 ºC (Initial setting): “1016” Digitally set value ≤ Tmax (Outside temperature -25 ºC: 65ºC, Outside temperature > -20 ºC : 70ºC) Thermo-ON Thermo-ON Single/Multiple...
[ VII Control ] Multiple system control (inlet-water-temperature-based control) When the water temperature is controlled based on the Thermo-OFF temperature representative inlet temperature, compressor frequency will Preset water temperature DIFF2/2°C be controlled as described in section -3- "Compressor fre- quency" (page 97). (Automatic operation according to the DIFF2/2°C preset temperature) Inlet water temperature...
[ VII Control ] Operation Mod e -14- Controlling the operation of unit using external water temperature sensors The water temperature can be controlled using the built-in sensor on the unit or a separately sold external water temperature sensor. The factory setting for the sensor option is "built-in sensor on the unit." (SW5-8: OFF) To control the water temperature with an external water temperature sensor, set SW5-8 to ON.
[ VII Control ] External water temperature sensor TW-TH16 1. Parts that are required to install an external water Wire specifications temperature sensor (1) External water temperature sensor Wire size 2-core cable Min. 1.25 mm (2) Wiring to connect the sensor and the unit* Type CVVS or CPEVS (3) Wiring terminals to connect the wiring to the sensor and...
VIII Test Run Mode  Items to be checked before a Test Run ................. 113  Test Run Method ......................115  Operating the Unit......................116  Refrigerant ........................117  Symptoms that do not Signify Problems ................ 117  Standard operating characteristics (Reference data) ............ 117 - 111 - HWE22020...
[ VIII Test Run Mode ]  Items to be checked before a Test Run VIII T est Run Mode (1) Check for refrigerant leak and loose cables and connectors. (2) Measure the insulation resistance between the power supply terminal block and the ground with a 500V megger and make sure it reads at least 1.0Mohm.
[ VIII Test Run Mode ] (11) Check that the unit is operating properly according to the temperature adjustment function. When a pull-down operation is completed, check that the hot water temperature adjustment function will come on and that the unit will automatically go on and off.
[ VIII Test Run Mode ]  Test Run Method Backlit LCD Function button ([F1], [F2], [F3], and [F4] from the left) ON/OFF lamp [ON/OFF] button [Return] button [Menu] button [Select] button Operation procedures Turn on the main power. Set the water temperature to a temperature at least 5 ºC above the current settings. Press the ON/OFF button to start operation.
[ VIII Test Run Mode ]  Operating the Unit 1. Initial Operation (1) Make sure the Run/Stop switch that controls the unit on the local control panel is switched off. (2) Switch on the main power. (3) Leave the main power switched on for at least 12 hours before turning on the Run/Stop switch that controls the unit on the on-site control panel to warm up the compressor.
[ VIII Test Run Mode ]  Refrigerant CAHV-R450YA-HPB(-BS) Unit type Refrigerant type R454C 9.0 kg Refrigerant charge  Symptoms that do not Signify Problems Symptom Remote controller display Cause Fan does not stop while stopping op- Extinguished If terminals 15 and 19 on TB6 are short-circuited, the fan will be forced to operate even after the eration.
[ VIII Test Run Mode ] - 118 - HWE22020...
[ IX Maintenance ]  Periodic maintenance inspections IX Maintenance Periodically check the refrigerant circuits, circulating-water circuits, and the entire electronic parts. Check items Check item Check point Standard 1. Around the unit 1. Check for debris such as dust and fallen leaves. Visual check (Twice/year) 2.
[ IX Maintenance ]  Guidelines for Maintenance and Inspection of Major Parts Troubleshooting according to the remote controller malfunction or the external inpu t error Both for MA remote con troller and ME remote controller The table below shows regular inspection items, schedule, and parts replacement criteria under normal use condition. The "Inspection schedule" column under the "Preventive maintenance" column indicates the regular inspection schedule, and the "Maintenance schedule"...
[ IX Maintenance ] Remark of semiotics : Inspection schedule : Cleaning or adjustment schedule of the parts based on the inspection result : Replacement or repair of the parts in case of error after inspection : Regular replacement (consumable parts) Preventive maintenance Inspection Maintenance schedule...
[ X Troubleshooting ]  Maintenance items X Troubleshooting 1. Checking the error history Take the following steps to view the last six error histories (error codes). Refer to “ 2.Error code list” for information about error codes. (page 137) Setting procedure Step 1 Set the dip switches on the circuit board as follows to view error histories.
[ X Troubleshooting ] Error history item list Unit and circuit type Item Item LED display Notes code Main unit Sub unit Error history 1 Error Code Error history 1 details (Inverter error) Error Code Error history 1/Occurrence time Time Error history 2 Error Code Error history 2 details (Inverter error)
[ X Troubleshooting ] 2. Checking the sensor status Setting procedure Step 1 Set the dip switches on the circuit board as follows to check temperatures and pres- Set the dip switches sures. SW5 and SW6. Step 2 Press the push switch SWP3 to toggle through the item codes listed below. Select the desired Select an item code from c01 through c36, and press either of the push switches SWP1 item with the push...
[ X Troubleshooting ] Sensors and item code list Unit and circuit type Item Item LED display Notes code Main unit Sub unit Error history 1 Error Code Error history 1 details (Inverter error) Error Code Error history 1/Occurrence time Time Error history 2 Error Code...
[ X Troubleshooting ] 3. Operation status before error Setting procedure Step 1 Set the dip switches on the circuit board as follows to view the operation status before Set the dip switches error. SW5 and SW6. Step 2 Press the push switch SWP3 to toggle through the item codes listed below. Select the desired item with the push switch SWP3.
[ X Troubleshooting ] Time of data storage before error Unit and circuit type Item Item LED display code Main unit Sub unit Inlet water temp (Twi ) First decimal place Outlet water temperature (Two) First decimal place Discharge refrigerant temperature TH1 First decimal place Suction refrigerant temperature TH2 First decimal place...
[ X Troubleshooting ] 4. Maintenance setting 1 This category includes items that are set during test run and maintenance. Setting procedure Step 1 Set the dip switches on the circuit board as follows. Set the dip switches SW5 and SW6. By setting SW6-9 to ON after setting the dip switches SW5 and SW6 as shown left, the setting values can be checked.
[ X Troubleshooting ] Maintenance item (1) list Unit type Item Incre- Lower Upper Switch setting Item Default Notes code ments limit limit timing Main unit Sub unit Forcing the units in a specific system to stop 1004 (Note1) When unit is stopped Outlet water temperature sensor correction (hot water)TH11 1009 Inlet water temperature sensor correction (hot water)TH10...
[ X Troubleshooting ]  Troubleshooting Troubleshooting according to the remote controller malfunction or the external inpu t error Both for MA remote con troller and ME remote controller 1. If a problem occurs, please check the following. If a protection device has tripped and brought the unit to stop (when an error code is blinking on the LED), resolve the cause of the error before resuming operation.
[ X Troubleshooting ] Problem Check item Cause Solution The unit has Automatic Start/Stop Water temperature is Normal stopped during thermistor has tripped. high. operation and does not restart. Water temperature is The setting for the automatic Start/Stop Change the setting for the automatic Start/ low.
[ X Troubleshooting ] 2. Error code list Error reset *3 Unit Error Cause Cause Preliminary side Remote code *1 Error type (PCB) (Installation/Setting error) (Parts problems) code (PCB *2) SWS1 Operation Unreset errors Some of the errors have not A000 been reset.
[ X Troubleshooting ] Error reset *3 Unit Error Cause Cause Preliminary side Remote code *1 Error type (PCB) (Parts problems) code (Installation/Setting error) (PCB *2) Operation SWS1 Discharge temperature fault No water • High-pressure sensor fault Abrupt change in water (A discharge refrigerant temperature of 120ºC or •...
[ X Troubleshooting ] Error reset *3 Unit Error Cause Cause Preliminary side Remote code *1 Error type (PCB) (Parts problems) code (Installation/Setting error) (PCB *2) Operation SWS1 Bus voltage drop protection Momentary power • INV board fault Inverter Voltage (S/W) failure/power failure •...
[ X Troubleshooting ] Error reset *3 Unit Error Cause Cause Preliminary side Remote code *1 Error type (PCB) (Installation/Setting error) (Parts problems) code (PCB *2) Operation SWS1 Inverter DCL electric current circuit error • Contact failure between CNCT1A and 4300 5301 CNCT1B...
[ X Troubleshooting ]  Troubleshooting Principal Parts High-Pressure Sensor -1- High-Pressure Sensor (PSH1) 1. Compare the pressure that is detected by the high pressure sensor, and the high-pressure gauge pressure to check for failure. Error history, temperature and pressure readings of the sensor, and LEV opening High pressure and low pressure will appear alternately on the 7-seg- ment LED at 3 second intervals.
[ X Troubleshooting ] Low-Pressure Sensor -2- Low-Pressure Sensor (PSL1) 1. Compare the pressure that is detected by the low pressure sensor, and the low pressure gauge pressure to check for failure. Error history, temperature and pressure readings of the sensor, and LEV opening High pressure and low pressure will appear alternately on the 7-seg- ment LED at 3 second intervals.
[ X Troubleshooting ] Soleno id Valve -3- Temperature sensor Use the flowchart below to troubleshoot the temperature sensor. Troubleshooting the thermistor Start Disconnect the thermistor to be checked from the circuit board. Measure the actual temperature of the pipe at the thermistor. Check the thermistor resistance.
[ X Troubleshooting ] -4- LEV 1. General descriptions of the operation of the LEV in the main circuit LEV1 is driven by the pulse signal from the circuit board and is controlled by a stepping motor. The valve opening changes according to the number of pulses 1) Control board and LEV Outdoor control board DC12V...
[ X Troubleshooting ] 2. General descriptions of injection LEV operation The valve opening changes according to the number of pulses. 1) Control board and LEV Outdoor control board DC12V ø6 ø5 Brown Drive circuit ø4 ø4 Blue ø3 ø3 Orange ø2 ø2...
[ X Troubleshooting ] (1) Judgment methods and possible failure mode Malfunction Judgment method Remedy mode Microcomputer Disconnect the control board connector and connect When the drive circuit has a driver circuit fail- the check LED as shown in the figure below. problem, replace the control board.
[ X Troubleshooting ] 3. Injection LEV coil removal procedure The LEV consists of a coil and a valve body that can be separated from each other. Body Coils Stopper Lead wire (1) Removing the coils Fasten the body tightly at the bottom (Part A in the figure) so that the body will not move, then pull out the coils toward the top.If the coils are pulled out without the body gripped, undue force will be applied and the pipe will be bent.
[ X Troubleshooting ] Inverter -5- Inverter Replace only the compressor if only the compressor is found to be defective. (Overcurrent will flow through the inverter if the compressor is damaged, however, the power supply is automatically cut when overcurrent is detected, protecting the inverter from damage.
[ X Troubleshooting ] Error display/failure condition Measure/inspection item Inverter related errors Check the details of the inverter error in the error log at  Error history 0403, 4220, 4225, 4226, 4230, 4235, 4240, 4245, 4250, 4255, item list. (page 128) 4256, 5110, 5301, 5305, 5306 Take appropriate measures to the error code and the error details in ac- cordance with  2.Error code list.
[ X Troubleshooting ] (2) Inverter output related troubles Items to be checked Phenomena Remedy Disconnect the invert- Overcurrent error Replace the INV board. Check the er output wire from (4250 Detail code No. 101, 104, INV board er- the terminals of the 105, 106, and 107) ror detection INV board (SC-U,...
[ X Troubleshooting ] Items to be checked Phenomena Remedy Put the outdoor unit into oper- Overcurrent-related problems oc- a. Check items  through  Check whether ation. cur immediately after compressor for problems. the inverter is Check the inverter output volt- startup.
[ X Troubleshooting ] Items to be checked Phenomena Remedy Put the outdoor unit into oper- BUS voltage does not boost (does not Replace the INV board. Check whether ation. change) BUS voltage does not boost to the converter Check the BUS voltage after approximately between 650 and 750 is damaged.
[ X Troubleshooting ] (4) Trouble treatment when the main power earth leakage breaker is tripped Items to be checked Phenomena Remedy Check the earth leakage breaker Use of a non-specified earth Replace with a regulation earth leakage capacity and the sensitivity cur- leakage breaker breaker.
[ X Troubleshooting ] (5) Simple checking procedure for individual components of main inverter circuit Turn off the power to the unit, and leave it turned off for at least 10 minutes. Check that the voltage across CN-P(+) and CN-N(-) on the INV board is 20 VDC or less before removing components from the control box. Part name Judgment method IGBT module...
[ X Troubleshooting ] Control Circuit -6- Control Circuit Troubleshooting transmission power circuit of outdoor unit Check the voltage at the indoor/outdoor transmission terminal block (TB3) of outdoor unit. Check whether the transmission line is disconnected, 24 ~ 30 VDC check for contact failure, and repair the problem.
[ X Troubleshooting ] Replace the M-NET board 198 ~ 264 VAC Replace the noise filter. Check the voltage between L3 and N at the power supply terminal block TB1. 198 ~ 264 VAC Replace the noise filter. Check and fix any power supply wiring and main power supply problems found.
• It may also be in violation of applicable laws. • MITSUBISHI ELECTRIC CORPORATION cannot be held responsible for malfunctions or accidents resulting from the use of the wrong type of refrigerant.
[ X Troubleshooting ] (4) Unscrew the five screws, and remove the compressor cover F. Screws (5 places) Compressor cover F Compressor cover T (5) Unscrew the three screws, and remove the compressor cover T. Screws (3 places) Screws (4 places) (6) Remove the four screws, two saddles, silicon rubber spacer, packing, two tie bands, and discharge pipe cover.
[ X Troubleshooting ] (8) Disconnect the three wires from the terminal screws of the compressor. Screws (3 places) (9) Recover the refrigerant through the high-pressure and low-pressure check joints. Check joint (10) Unscrew the screw, and remove the pipe fixing plate of the coil.
[ X Troubleshooting ] (12) Disconnect the discharge pipe, suction pipe, and injection pipe from the compressor by removing the braze. (13) Pull out the compressor, and replace it. (Be careful not to get the injection pipe caught with the suction pipe of the compressor.) Brazed area (14) After removing the compressor, remove the four...
[ X Troubleshooting ] 2. Thermistor replacement instructions Procedure Illustration (1) Unscrew the six screws, and remove the service panel FU on the top left. Service panel FU Screws (6 places) (2) Unscrew the four screws, and remove the control box panel.
[ X Troubleshooting ] (5) Cut the two tie bands, and take the thermistor out of the Tie bands (2 places) thermistor holder. Thermistor holder (6) Insert the thermistor into the thermistor holder. (Tape with green at the bottom (TH10)) Tape with green at the bottom (7) Hold the thermistor holder and the thermistor wire together Tie bands (2 places)
[ X Troubleshooting ] 3. Plate heat excanger replacement instructions Procedure Illustration (1) Unscrew the 10 screws, and remove the service panels FB_L1 and FB_L2 on the left. Panel FB_L2 Panel FB_L1 Screws (10 places) (2) Remove the housing joint, and then the pipes on site. Housing joint On-site piping (3) Remove the six tie bands from the pipe cover.
[ X Troubleshooting ] (4) Remove a pipe cover. Pipe cover (5) Unscrew the two screws, and remove the saddle and the silicon rubber spacer. Silicone rubber spacer Saddle Screws (2 places) (6) Unscrew the three screws, and remove the four-way valve fixing plate.
[ X Troubleshooting ] (8) Remove the braze from three areas. Remove the braze (3 places). (9) Disconnect the U-pipe. U-pipe (10) Unscrew the screws holding the water heat-exchanger fixing plate. Unscrew the screw holding the ground wire on the water heat-exchanger side. Screw holding the grounding wire (1 place) Screws holding the...
[ X Troubleshooting ] (12) Slide off the four tie bands and the pipe cover from the Tie bands (4 places) back of the water heat-exchanger. Pipe cover (13) Cut the tie bands, and take the thermistor out of the Tie bands (2 places) thermistor holder.
[ X Troubleshooting ] 4. Reactor replacement instructions Procedure Illustration (1) Unscrew the six screws, and remove the service panel FU on the left. Panel FU Screws (6 places) (2) Unscrew the four screws, and remove the control box panel. Set SWS1 of the control board to OFF, and turn off Screws (4 places) the main power supply (breaker).
[ X Troubleshooting ] (5) Disconnect the wires from inside the control box. (6) Unscrew three screws from the control box, lower the control box, and let it stand on its bottom. (Control box: Screws (3 places) Approximately 25 kg) (7) Unscrew three screws, and remove the reactor cover.
[ X Troubleshooting ] (10) Screw down the reactor cover with three screws. Screws (3 places) Reactor cover (11) Screw down the control box with three screws to the unit. Screws (3 places) (12) Reinstall the wires inside the control box, control box panel, and the service panel FU back in place to complete the procedure.
[ X Troubleshooting ] - 172 - HWE22020...
XI USB Function  Service Overview ......................175  Software Rewrite Function on the USB ................. 177  Maintenance LED Display and Troubleshooting............179 - 173 - HWE22020...
[ XI USB Function ]  Service Overview XI U SB Function <1> Function Overview The control board has a USB port that allows the use of the following two functions. 1. Software rewrite function The software on outdoor units can be rewritten using a USB memory stick. For detailed information about each function, refer to Section “XI  Software Rewrite Function on the USB”.
[ XI USB Function ] <3> Necessary Materials The use of the USB function requires a USB memory stick and a portable battery charger. See below for the types of USB memory stick and portable charger that can be used. (1) USB memory stick Use a USB memory stick that meets the following specifications.
[ XI USB Function ]  Software Rewrite Function on the USB The USB memory stick may be used to rewrite the software of the outdoor unit in the same way as using a ROM writer. <1> Preparation • Prepare a USB memory stick and a portable battery charger. A LEAD WIRE ASSY USB for connecting the control board and the charger is also necessary.
[ XI USB Function ] <3> Precautions For dealing with the displays shown on the maintenance LED and other problems, refer to Section “XI  Maintenance LED Display and Troubleshooting”. • Take care to choose the correct countermeasure program for the intended model and version. Store only one software rewrite program on the USB memory stick.
[ XI USB Function ]  Maintenance LED Display and Troubleshooting <1> Maintenance LED Display Content List The following table shows the maintenance LED displays for each function. When dealing with the errors shown on the display, refer to Section “XI  <2> Troubleshooting”. 1.
[ XI USB Function ] <2> Troubleshooting Troubleshooting of USB functions are shown below. The displays on the maintenance LED described in “XI  <1> Maintenance LED Display Content List” may also be used as a reference. 1. Rewriting software (1) Maintenance LED does not display "Pro."...
[ XI USB Function ] (5) Maintenance LED displays "Er02." (Meaning or Cause) Software rewrite is suspended due to a problem with the USB memory stick during the software rewrite process. For example, if the USB memory stick is disconnected during data storage, this display appears on the maintenance LED. (Solution) Check the connection of the USB memory stick.
[ XII Attachments ]  R454C saturation temperature table XII Attachments Saturation Saturation Saturation Saturation Saturation Saturating temperature °C Saturating temperature °C Saturating temperature °C Saturating temperature °C Saturating temperature °C pressure pressure pressure pressure pressure Saturated Saturated Saturated Saturated Saturated Saturated Saturated...