CYLINDER UNIT July 2011 No. OCH507 SERVICE MANUAL R410A [Model name] [Service Ref.] EHST20C-VM6HA EHST20C-VM6HA.UK EHST20C-YM9HA.UK EHST20C-VM6A.UK EHST20C-YM9A.UK EHST20C-VM6SA.UK EHPT20X-VM2HA.UK EHPT20X-VM6HA.UK EHPT20X-YM9HA.UK EHPT20X-VM6A.UK EHPT20X-YM9A.UK EHST20C-YM9HA EHST20C-VM6A EHST20C-YM9A EHST20C-VM6SA EHPT20X-VM2HA EHPT20X-VM6HA EHPT20X-YM9HA EHPT20X-VM6A EHPT20X-YM9A Note: • This manual describes only service data of cylinder unit.
1 REFERENCE MANUAL OUTDOOR UNIT'S SERVICE MANUAL Service Ref. Service Manual No. PUHZ-RP35/50/60/71VHA4 PUHZ-RP100/125/140VKA OCH451 PUHZ-RP100/125/140YKA PUHZ-HRP71/100VHA PUHZ-HRP71/100VHA2 PUHZ-HRP71/100VHA2R1 PUHZ-HRP100VHA2R2 OCH425 PUHZ-HRP100/125YHA PUHZ-HRP100/125YHA2 PUHZ-HRP100/125YHA2R1 PUHZ-W50/85VHA PUHZ-W50/85VHA-BS PUHZ-W85VHAR1 OCH439 PUHZ-W85VHAR1-BS PUHZ-W85VHA2.UK PUHZ-W85VHA2-BS.
2 SAFETY PRECAUTION Please read the following safety precautions carefully. WARNING: Precautions that must be observed to prevent injuries or death. CAUTION: Precautions that must be observed to prevent damage to unit. This installation manual along with the user manual should be left with the product after installation for future reference. Mitsubishi Electric is not responsible for the failure of locally or field-supplied parts. • Be sure to perform periodical maintenance.
WARNING (SPLIT MODELS ONLY) Do not discharge refrigerant into the atmosphere. If refrigerant leaks during installation, ventilate the room. Use appropriate tools for high pressure refrigerant. When pumping down refrigerant , stop the compressor before disconnecting the refrigerant pipes. During installation securely fasten the refrigerant pipes before starting the compressor. Check that refrigerant gas does not leak after the completion of installation. Use R410A refrigerant only.
CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Use new refrigerant pipes. If using the existing R22, be careful of the followings. · For RP100, 125 and 140, be sure to perform replacement operation before test run. · Change flare nut to the one provided with this product. Use a newly flared pipe. · Avoid using thin pipes.
[1] Cautions for service (1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) When performing service, install a filter drier simultaneously. Be sure to use a filter drier for new refrigerant. [2] Additional refrigerant charge When charging directly from cylinder · Check that cylinder for R410A on the market is syphon type.
DHW tank Booster heater Water circuit (Primary) Optional extras • Wireless Remote Controller • Wireless Receiver • Immersion heater (1 Ph 3kW) • EHPT Accessories for UK Solar (ancillary) connection Electrical data Tank performance *2 Operating ambient condition Connections Primary circuit circulating Pump Safety device Unvented expansion vessel (Primary heating) Plate heat exchanger Heating 1.0 MPa (10 bar) 1.0 MPa (10 bar) 119 kg 90°C/ 0.7 MPa (7 bar) 9.52 mm 3~, 400 V, 50 Hz 15.
4 PART NAMES AND FUNCTIONS (Split model system) Number B A F 2 1 Automatic air vent 2 Pressure relief valve 3 Expansion vessel 4 Main controller 5 Control and electrical box 7 Immersion heater (Only for EHST20C-*M*HA) 8 DHW tank 9 3-way valve 10 Water circulation pump 11 Manual air vent 12 Booster heater 13 Drain cock (Booster heater) 14 Strainer valve 15 Flow switch 12 16 Drain cock (Primary circuit) 17 Drain cock (DHW tank) 7 18 Plate heat exc
(UK Packaged model system) B A F Number 2 Automatic air vent 2 Pressure relief valve 3 Expansion vessel 4 Main controller 5 Control and electrical box 6 Temperature and pressure relief valve (not visible) 7 Immersion heater 8 DHW tank 9 3-way valve 10 Water circulation pump 11 Manual air vent 12 Booster heater 13 Drain cock (Booster heater) 14 Strainer valve 7 15 Flow switch 16 Drain cock (Primary circuit) 13 15 17 Drain cock (DHW tank) 19 Manometer
5 OUTLINES AND DIMENSIONS (Unit: mm) 5-1. Technical Drawings 595 G1/2 Main controller 100±20 Air vent Pressure relief valve 79 680 30 445 Temperature and pressure relief valve and its access plate (EXPT20X-VM2HA only) 183 50 156 1600 1 950 1095 Terminal block Front panel C D E 47.1 0 550.2 541.1 522.8 492.2 470.8 Letter 0 63.3 67.
6 WIRING DIAGRAM 6-1. EHST20C-VM6HA * See Chapter 6-10.
6-2. EHST20C-YM9HA * See Chapter 6-10.
6-3. EHST20C-VM6A EHST20C-VM6SA * See Chapter 6-10.
6-4. EHST20C-YM9A * See Chapter 6-10.
6-5. EHPT20X-VM2HA * See Chapter 6-10.
6-6. EHPT20X-VM6HA * See Chapter 6-10.
6-7. EHPT20X-YM9HA * See Chapter 6-10.
6-8. EHPT20X-VM6A * See Chapter 6-10.
6-9. EHPT20X-YM9A * See Chapter 6-10.
6-10. Dip switch setting Located on the FTC3 printed circuit board are 4 sets of small white switches known as Dip switches. The Dip switch number is printed on the circuit board next to the relevant switches. The word ON is printed on the circuit board and on the Dip switch block itself. To move the switch you will need to use a pin or the corner of a thin metal ruler or similar. SW1 SW2 SW4 Dip switch settings are listed below in the table below.
7 FIELD WIRING Option 1: Cylinder unit powered via outdoor unit <1 phase> Cylinder unit TB1 L Outdoor unit Power supply ~/N 230V 50Hz Wiring circuit breaker or Isolating switch Earth leakage breaker N L S1 N S2 S2 S3 S3 S1 ECB1 Power supply ~/N 230V 50Hz Wiring circuit breaker or Isolating switch Power supply ~/N 230V 50Hz Wiring circuit breaker or Isolating switch L N ECB2 L N To control board ELB for booster heater (Primary circuit) ELB for immersion heater (DHW tank) * Installer
<3 phase> Cylinder unit TB1 L Outdoor unit Power supply 3N~ 400V 50Hz Wiring circuit breaker or Isolating switch Earth leakage breaker N L1 S1 L2 S2 S2 L3 S3 S3 S1 To control board N ECB1 Power Supply 3~ 400V 50Hz Wiring circuit breaker or Isolating switch Power Supply ~/N 230V 50Hz Wiring circuit breaker or Isolating switch L1 L2 L3 ECB2 L N ELB for booster heater (Primary circuit) ELB for immersion heater (DHW tank) * Installer MUST affix label A that is included with the manuals n
BLACK L N S1 CNO1 • Cylinder unit electrical box connector connections changed (see Figure 7-3) • Outdoor unit DIP switch settings changed to SW8-3 ON • Turn on the outdoor unit before the cylinder unit. YELLOW Initial settings (Power supplied by outdoor unit) YELLOW If the cylinder and outdoor units have separate power supplies, the following requirements MUST be carried out: BLACK Option2: Cylinder unit powered by independent source.
<3 phase> Cylinder unit TB1 Power supply ~/N 230V 50Hz Wiring circuit breaker or Isolating switch Earth leakage breaker L N Outdoor unit Power supply 3N~ 400V 50Hz Earth leakage breaker Wiring circuit breaker or Isolating switch L1 S1 S1 L2 S2 S2 L3 S3 S3 To control board N ECB1 Power supply 3~ 400V 50Hz Wiring circuit breaker or Isolating switch Power supply ~/N 230V 50Hz Wiring circuit breaker or Isolating switch L1 L2 L3 ECB2 L N ELB for booster heater (Primary circuit) ELB for i
8 WATER SYSTEM DIAGRAM EHST20C-*M*HA / *M*A EHST20C-VM6SA 25
EHPT20X-VM2HA EHPT20X-*M*HA / *M*A 26
Filling the cylinder unit 1. 2. 3. 4. Check all connections including factory fitted ones are tight. Insulate pipe work between cylinder and outdoor unit. Thoroughly clean and flush, system of all debris. (see section 4.2 of Installation Manual for detailed instructions.) Fill cylinder with potable water. Fill primary heating circuit with water and suitable anti-freeze and inhibitor as necessary.
9 CONTROLS 9-1. Main Controller A F1 F3 F2 C Name Function A B Screen Menu C D E Back Confirm Power/Holiday F1-4 Function keys Screen in which all information is displayed Access to system settings for initial set up and modifications. Return to previous menu. Used to select or save. (Enter key) If system is switched off pressing once will turn system on. Pressing again when system is switched on will enable Holiday Mode.
Initial Unrestricted access Installer only Main screen F1 Information Option F4 F1 F2 F3 F4 Forced DHW DHW Heating Holiday ON/OFF ON/OFF/Timer ON/OFF/Timer Active/Non active Set time Main menu DHW Normal Eco Edit DHW max. temp DHW max. temperature drop DHW max. operation time DHW mode restriction Legionella Active/Non active Edit Hot water temp. Frequency Start time Max. operation time Duration of max. temp.
9-2. Service Menu The service menu provides functions for use by installer or service engineer. It is not intended the home owner alters settings within this menu. It is for this reason password protection is required to prevent unauthorised access to the service settings. rom the main setting menu use F2 and F3 to highlight the service icon then 1. F press CONFIRM. . You will be prompted to enter a password. THE FACTORY DEFAULT PASSWORD IS 0000. 3. Press CONFIRM. (It takes approx.
Auxiliary Setting This function is used to set the parameters for any auxiliary parts used in the system. From the service menu use F1 and F2 buttons to highlight Auxiliary setting then press CONFIRM. Auxiliary setting menu screen 1. From the Auxiliary setting menu highlight Economy Settings for pump. . Press CONFIRM. 3. The economy settings for pump screen will be displayed. 4. Use button F1 to switch the pump ON/OFF. 5.
During the filling of the system the pump and 3-way valve can be manually overridden using manual operation mode. When manual operation is selected a small timer icon appears in the screen. The function selected will only remain in manual operation for a maximum of 2 hours. This is to prevent accidental permanent override of the FTC3. rom the service menu use F1 and F2 buttons to scroll through list until Manu1. F al Operation is highlighted. . Press CONFIRM. 3.
The default heat source setting is heat pump and all electric heaters present in the system to be operational. This is referred to as Standard operation on the menu. 1. F rom the service menu use F1 and F2 buttons to scroll through list until Heat Source Setting is highlighted. . Press CONFIRM. 3. Heat source setting menu screen is displayed. 4. Press F3 button until preferred heat source is displayed. 5. Press CONFIRM. 6. To return to service menu press MENU or BACK button. 7.
This function allows operational setting of flow temperature range from the Ecodan and also the time interval at which the FTC3 collects and processes data for the auto adaptation mode. rom the Operation setting menu use F1 and F2 buttons to scroll through the 1. F list until Room temp. control (HEATING) is highlighted. . Press CONFIRM. 3. Room temp. control (HEATING) screen is displayed. 4.
Indoor unit switch setting display (Request code: 162 to 165) 0: OFF 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0: OFF 1: ON 2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 SW1, SW2, SW3, SW4 3 4 5 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 0 1 0 0 0
Indoor unit switch setting display (Request code: 162 to 165) 0: OFF 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0: OFF 1: ON 2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 SW1, SW2, SW3, SW4 3 4 5 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 0 1 0 0 0
Output signal display (Request code: 175) Please refer to Table 2 on relevant wiring diagram whilst using the following.
Indoor unit switch setting display (Request code: 175) Please refer to Table 2 on relevant wiring diagram whilst using the following.
Output signal display (Request code: 175) Input signal display (Request code: 176) Please refer to Table 2 on relevant wiring diagram whilst using the following. Please refer to Table 1 on relevant wiring diagram whilst using the following.
This function shows the current readings of thermistors located on the water and refrigerant circuit Thermistor Description TH1 Room temperature Refrigerant return temperature TH2 THW1 Water flow temperature Water return temperature THW2 TH5A — TH5B Tank temperature TH5C — TH7 Ambient (outdoor) temperature This function shows the current installer/user entered settings.
Password protection is available to prevent unauthorised access to the service menu by untrained persons. 1. F rom the service menu use F1 and F2 buttons to scroll through list until Password protection is highlighted. . Press CONFIRM. 3. When password input screen is displayed use buttons F1 and F2 to move left and right between the four digits, F3 to lower the selected digit by 1, and F4 to increase the selected digit by 1. 4. When you have input your password press CONFIRM. 5.
In Emergency operation mode the outdoor heat pump unit will not operate. Heating for DHW and space heating is provided by the booster heater and the tank immersion heater (if installed). Space heating flow temp is restricted 40°C if an immersion heater is not present on the DHW tank then the booster heater will also indirectly heat the DHW. When in Emergency operation the main control has NO control functions.
10 TROUBLESHOOTING 10-1. Troubleshooting Present and past Error codes are logged and displayed on the main controller or control board of the outdoor unit. Please refer to the table below and subsequent explanations to diagnose and remedy typical problems that may occur in the field. Unit Condition Reoccurring problem Error Code Displayed Not Displayed Non reoccurring problem Action Use table 10-4.
10-4. Self diagnosis and action Check if Dip SW is set correctly. (Refer to Chapter 6-10.) Error code L1 Title and display conditions Possible Cause Booster heater overheat detection 1 Insufficient system head Error code displayed when THW3 detects temp. of ≥ 85ºC for 10 consecutive seconds. 2 Reduced flow in primary water circuit Due to 1 or more of the following; Faulty pump, insufficient air purge, blockedstrainer, leak in water circuit.
Error code L3 Title and display conditions Circulation water temperature overheat protection Error code displayed when THW1 detects a temp. ≥ 80ºC for 10 consecutive seconds or THW2 detects a temp ≥ 80ºC for 10 consecutive seconds. Possible Cause Diagnosis and action 1 Insufficient system head 1 Refer to table in section 10-6. to determine if system pump meets requirements. If more head required either add an pump of the same size or replace existing pump with capacity model.
Error code L6 Title and display conditions Circulation water freeze protection Error code displayed when THW1 detects a temp. ≤ 1ºC for 10 consecutive seconds or THW2 detects a temp. ≤ 3ºC for 10 consecutive seconds. Exception Error code will not be displayed if; FS function is disabled, For 10 mins after water circulation pump1 is switched on. Possible Cause 1 Insufficient system head Diagnosis and action 1 Refer to table in section 10-6.
Error code Title and display conditions L9 Low primary circuit flow rate detected by flow switch Error code displayed when flow switch detects low flow rate for 10 seconds. Exception For 3 mins after water circulation pump1 is switched on. Possible Cause 1 Insufficient system head Diagnosis and action 1 Refer to table in section 10-6. to determine if system pump meets requirements.
Error code Title and display conditions Possible Cause E7 Indoor/outdoor communication failure (Transmission error) Error code E7 is displayed if despite the FTC3 board sending signal "0", signal "1" is received 30 consecutive times. 1 Fault with FTC3 transmission/receiving circuit board 2 Electrical noise causes interference with power supply. 3 Electrical noise causes interference with FTC3-outdoor unit transmission cable.
10-5. Troubleshooting by inferior phenomena No. Fault symptom Possible cause 1 Main controller display does not work. 1. There is no power supply to main controller. Explanation - Solution 2. Power is supplied to main controller, however, the display on the main controller is not visible. 1. "Please Wait" is displayed for up to 6 mins. 2. Communication failure between the main controller and FTC3. 3. Communication failure between FTC3 and outdoor unit.
No. Fault symptom Possible cause 5 LED2 on FTC3 is blinking. When LED1 on FTC3 is also blinking. Connection failure of FTC3/outdoor unit connecting wire When LED1 on FTC3 is lit. 1. Miswiring of main controller wires Multiple indoor units have been wired to 1 outdoor unit. 2. Miss-setting of refrigerant address for outdoor unit (Outdoor unit refrigerant address should be set to "0") 3. Short-circuit of main controller wires 4. Defective main controller 6 No water at hot tap. 7 Cold water at tap.
No. 12 Fault symptom Heating system does not get up to set temperature. 13 After DHW operation room temperature rises a little. 14 The room temperature rises during DHW operation. 15 Water discharges from pressure relief valve. (Primary circuit) 16 Water discharges from pressure relief valve. (Sanitary circuit) 17 Water discharges from temperature and pressure relief valve (EHPT20X-VM2HA only) (Sanitary circuit) Possible cause Explanation - Solution 1.
No. Fault symptom Possible cause Explanation - Solution 23 Heating mode has been on standby for a long time (does not start operation smoothly.) Duration is set to excessively short time at “Economy setting for pump”. (Go to “Service menu” → “Auxiliary setting” → “Economy setting for pump”). Set “Economy setting for pump” longer. 24 Heating emitter is hot in the DHW mode. (The room temperature rises.
Part Name Check Points Measure the resistance between the terminals with a tester. Booster heater Thermostat (90 °C) and thermal cut out (121 °C) 90 °C Manual reset water thermostat 121 °C Thermal cut-out Normal 110(±35)mΩ Abnormal Open or Short Terminal 1-2 Normal 26.5(+3/-1.3)Ω Abnormal Open or Short Terminal 1-2 3-4 Normal 26.5(+3/-1.3)Ω 13.3(+1.5/-0.6)Ω Abnormal Open or Short Open or Short Terminal 1-2=2-3=1-3 4-5=5-6=4-6 Normal 105.8(+11.8/-5)Ω 52.9(+5.8/-2.
• Room temperature thermistor (TH1) • Liquid refrigerant temperature thermistor (TH2) • Flow water temperature thermistor (THW1) • Return water temperature thermistor (THW2) • DHW tank temperature thermistor (THW5B) 50 Thermistor R0 = 15kΩ ± 3% B constant = 3480 ± 2% 1 1 Rt = 15exp {3480 ( 273+t – 273 )} Resistance (k ) 0°C 10°C 20°C 25°C 30°C 40°C 40 15kΩ 9.6kΩ 6.3kΩ 5.2kΩ 4.3kΩ 3.
10-7. Test point diagram FTC3 (Controller board) F3 6.3A/250V F4 6.3A/250V F2 6.3A/250V CNP/OUT1 (TBO.1 1-2) Water circulation pump1 (230V AC) CN01 Power supply (230V AC) OUT2 (TBO.1 3-4) Water circulation pump2 (field supply) (230V AC) F1 6.3A/250V CNV1/OUT4 (TBO.1 7-9) 3-way valve (7-8:230V AC) CN3C Transmission (Indoor/outdoor) (0~24V DC) CNBHT/BHT (TBO.2 1-2) Thermostat input for booster heater CNBC/BC (TBO.2 3-4) Signal output for booster heater protection (230V AC) OUT8 (TBO.
11 DISASSEMBLY PROCEDURE ● Prepare the proper tools. ● Prepare the proper protectors. ● Provide adequate ventilation. ● After stopping the operation of the cylinder and outdoor unit, turn off the power-supply breaker and remove the power plug. ● Discharge the condenser before the work involving the electric parts. ● Allow parts to cool. ● Do not expose the electric parts to water. ● When replacing or servicing water circuit parts, drain system first.
PHOTOS DISASSEMBLY PROCEDURE 3. How to remove the electrical parts Photo 3-1 (Steps (1) through (3) are applied to all the following parts.) Control box cover fixing screws (Photo 3-1) (1) Remove the front panel. (Refer to Procedure 1). (2) Remove the 4 screws holding the control box cover. (3) Slightly lift and pull out the control box cover. (Photo 3-2) (4) Disconnect all the lead wires from the earth leakage breaker.
PHOTOS DISASSEMBLY PROCEDURE 4. How to remove the control box (1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the control box cover. (Refer to Procedure 3.) (3) Disconnect only the lead wires in the control box that connect to the components in the cylinder unit. Photo 4-2 shows the control box after the related lead wires are disconnected. (4) Remove the 2 screws on the brackets (R) and disengage the tabs on the 2 control box brackets from the right hand frame.
PHOTOS DISASSEMBLY PROCEDURE 5. How to remove water pump/ pump valve Photo 5-1 (1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the control box cover. (Refer to Procedure 3.) (3) Disconnect the CNP1 connector on the controller board and release the lead wire from the 3 cable clamps and the 2 cable straps in the control box, and the 3 bands and the 2 cable straps below the control box, and disconnect the earth cable in the control box.
PHOTOS DISASSEMBLY PROCEDURE 6. How to remove the 3-WAY VALVE / 3-WAY VALVE MOTOR (1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the control box. (Refer to Procedure 4.) (3) Remove the 3-way valve motor from the 3-way valve while pressing the button on the back of the motor (viewed from the front of the cylinder unit). (Photo 6-2) w Press the button also when reinstalling the 3-way valve motor.
DISASSEMBLY PROCEDURE PHOTOS 7. How to remove the flow switch (1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the control box cover. (Refer to Procedure 3.) (3) Disconnect the CN2F connector on the controller board. (Photo 4-1) (4) Release the lead wire from the 5 bands and 2 cable straps. (Photos 10-1, 10-2) (5) Close (OFF) the strainer valve handle (under). (Photo 10-2) wW hen the valve handle is stiff, remove the handle and turn the vertical stem 90 degree mainly by using a spanner.
DISASSEMBLY PROCEDURE 8. How to remove the booster heater (1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the control box cover. (Refer to Procedure 3.) (3) Disconnect the CNBHT connector and the THW3 connector on the controller board, and the 4 booster heater lead wires wired to the BHC1 and BHC2 contactors and release the lead wires from the 7 bands and the 2 cable straps. (Photos 8-1, 10-1, 10-2) w THW3 will be used later. (4) Close (OFF) the pump valve (lower) to stop flow.
DISASSEMBLY PROCEDURE PHOTOS 9. How to remove the thermostat/immersion heater Photo 9-1 (1) Remove the front panel. (Refer to Procedure 1.) (2) Peel off the water-proof tapes on the plastic head of the thermostat in order to reveal the thermostat terminals, and disconnect the lead wires from the terminals. (Photo 9-1) w Use new commercially available water-proof tapes to cover the terminals again. (3) Pull out the thermostat.
DISASSEMBLY PROCEDURE PHOTOS 10. How to remove the plate heat exchanger (1) Remove the front panel. (Refer to Procedure 1.) (2) Pump down the refrigerant circuit and close the stop valve at the outdoor unit side. (Refer to 12. SUPPLEMENTARY INFORMATION.) (3) Remove the control box. (Refer to Procedure 4.) (4) Cut the bands and remove the pump frame. (Photo 10-1) (5) Cut the bands bundling the pipes. (Photos 10-2, 10-3) (6) Remove the 2 flare nuts on the refrigerant piping on top of the cylinder unit.
DISASSEMBLY PROCEDURE PHOTOS 10. How to remove the plate heat exchanger (10) D isplace the plate heat exchanger together with the refrigerant pipes, the water pipe and the flexible hose to the front of the cylinder unit while feeding the top ends of the 2 refrigerant pipes though the openings in the top panel and remove the heat exchanger unit from the cylinder unit. (Photos 10-3, 10-4, 10-5) (11) Loosen the 1" nut on the water pipe and remove the water pipe form the plate heat exchanger.
DISASSEMBLY PROCEDURE PHOTOS 12. How to remove the pressure relief valve / manometer / air vent (automatic) (1) Remove the front panel. (Refer to Procedure 1.) (2) Swing the control box to the front. (Refer to Procedure 4.) Photo 12-1 (3) Remove the 2 screws on the manometer stay on top of the cylinder unit. (Photo 12-1) (4) Remove the 1/4" nut from the pressure relief valve and remove the capillary tube from the pressure relief valve.
DISASSEMBLY PROCEDURE PHOTOS 13. How to remove the expansion vessel (1) Remove the front panel. (Refer to Procedure 1.) (2) Swing the control box to the front. (Refer to Procedure 4.) (3) Remove the flare nut using two spanners: one to hold the flare joint and the other to turn the flare nut. (4) Displace the pipe slightly downward and pull out the expansion vessel. (5) Remove the flare joint from the expansion vessel. w When reinstalling the flare joint, use a new 3/8" gasket.
PHOTOS DISASSEMBLY PROCEDURE Photo 16-1 16. How to remove the drain cock (primary circuit) (1) Remove the front panel. (Refer to Procedure 1.) Drain cock (booster heater side) Booster heater side (2) Remove the drain cock from the booster heater by turning the drain cock. Pipe side (2) Remove the drain cock from the pipe using two spanners: one to hold the flare joint and the other to turn the flare joint nut. (3) Remove the flare joint from the drain cock. Drain cock (Pipe side) 17.
PHOTOS DISASSEMBLY PROCEDURE 19. Remove the liquid refrigerant temp. thermistor (TH2) / flow water temp. & return water temp. thermistor (THW1,THW2) / tank water temp. thermistor (THW5B) (1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the control box cover. (Refer to Procedure 3.) (3) Disconnect the following thermistor connectors on the controller board and release the lead wires from cable clamps and bands.
PHOTOS DISASSEMBLY PROCEDURE 20. How to remove the booster heater temp. thermistor (THW3) (1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the control box cover. (Refer to Procedure 3.) (3) Remove the THW3 connector on the controller board. (Photo 19-2) (4) Cut the band bundling the THW3 cable. (5) Run the thermistor cable out the bottom of the booster heater and remove the THW3 thermistor. Photo 20-1 Booster heater Thermistor THW3 cable Band 21.
Notes on replacing the parts Replacement of the parts listed below requires the following procedure. After the parts are removed, eliminate loctite on threads by applying loctite remover, apply new loctite, and then install and tighten the parts to the specified tightening torques below. For details about recommended loctite and loctite remover, refer to Table 11-1, and for details about the replacement parts and their tightening torques, refer to Table 11-2. Table 11-1 Recommended Manufacturer No.
12 SUPPLEMENTARY INFORMATION Refrigerant recovery (pump down) for split systems only For split system the following procedures should be followed to recover system refrigerant: Note) Pump down operation can not be activated by switching the pump down switch (SWP) or test run switch on the outdoor unit PCB. Ensure both the outdoor unit and the indoor unit are in emergency mode before carrying out the following.
13 SERVICE AND MAINTENANCE Engineers form The main controller settings changed from the default settings are reset by replacing the controller board. To facilitate reselecting settings on the main controller, it is recommended to write down the changes in the sheet below before replacement. Commissioning/Field settings record sheet Parameters Main Setting Option Forced DHW operation DHW Heating Holiday mode DHW Operation mode DHW max. temp DHW temperature drop DHW max.
Annual Maintenance Log Book Engineer name Site number Contractor name Site name Cylinder maintenance record sheet Warranty number No. Mechanical Turn OFF water supply, drain tank, remove mesh from strainer clean and replace in strainer. *1 Keep water supply OFF, open hot water taps and check the expansion 2 vessel charge pressure. Top up if necessary (1 bar). Turn water supply ON, open the pressure relief valve and then the expansion valve in turn.
HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2011 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Distributed in Jul. 2011 No. OCH507 Made in Japan New publication, effective Jul.
