Table Of Contents - Mitsubishi Electric EHST17D-VM2D Service Manual

Table of Contents

Contents1
Outdoor Unit's Service Manual3
Safety Precaution4
Meanings Of Symbols Displayed On The Unit4
Cautions For Service5
Additional Refrigerant Charge5
Service Tools5
Electronic Weighing Scale5
Specifications6
Part Names And Functions9
Outlines And Dimensions11
Technical Drawings11
Service Access Diagrams12
Wiring Diagram13
Dip Switch Functions18
Field Wiring19
Cylinder Unit Powered Via Outdoor Unit19
Electrical Connections 1 Phase19
3 Phase20
Electrical Connections 3 Phase20
Option 2: Cylinder Unit Powered By Independent Source21
Water System Diagram23
Local System25
1-Zone Temperature Control25
2-Zone Temperature Control25
1-Zone Temperature Control With Boiler25
Filling The Cylinder Unit (Primary Circuit)26
Filling The Cylinder Unit (Potable/Dhw Circuit)26
Draining The Cylinder Unit26
Controls27
Main Remote Controller27
Main Remote Controller Parts27
Main Screen Icons27
Setting The Main Remote Controller28
Main Settings Menu28
General Operation28
Main Remote Controller Menu Tree29
Service Menu32
Manual Operation32
Function Settings32
Thermistor Adjustment33
Auxiliary Settings33
Economy Settings For Pump33
Electric Heater (Heating)33
Mixing Valve Control34
Flow Sensor34
Heat Source Setting34
Pump Speed34
Operation Settings35
Heating Operation35
Freeze Stat Function35
Simultaneous Operation35
Energy Monitor Settings36
General Description36
Calculation Internally36
Actual Measurement By External Meter36
Settings Using The Main Remote Controller37
External Input Settings37
Demand Control (In4)37
Outdoor Thermostat (In5)37
Summary Of Settings38
Error History38
Password Protection38
Resetting The Password38
Manual Reset39
Sd Card39
Indoor Unit Switch Setting Display41
Output Signal Display43
Indoor Unit Only Operation47
Emergency Operation47
Troubleshooting48
Test Run48
Malfunction Diagnosis Method By Main Remote Controller48
Self Diagnosis And Action49
Circulation Water Temperature Overheat Protection49
Tank Water Temperature Overheat Protection49
Indoor Unit Temperature Thermistor Failure50
Circulation Water Freeze Protection50
Heating Operation Error51
Low Primary Circuit Flow Rate Detected By Flow Sensor51
Low Primary Circuitflow Rate Detected By Flow Switch51
Pressure Sensor Failure52
High Pressure Protection52
Boiler Operation Error52
Flow Sensor Failure52
Defrosting53
Main Remote Controller Communication Failure53
Indoor/Outdoor Communication Failure53
Indoor Unit/Wireless Receiver Communication Failure54
Wireless Remote Controller/Wireless Receiver Communication Failure54
Troubleshooting By Inferior Phenomena55
Checking Component Parts' Function61
Water Circulation Pump (Primary Circuit)61
Recommended Water Flow Rate Range61
Water Circulation Pump (Primary Circuit) Characteristics61
Booster Heater62
Earth Leakage Circuit Breaker For Heater62
Relay For Heater62
3-Way Valve62
Pressure Sensor63
Thermistors63
Thermistor Characteristics Charts63
Test Point Diagram64
Ftc (Controller Board)64
Disassembly Procedure65
Preparation For The Repair Service65
How To Remove The Front Panel65
How To Remove The Remocon Assy65
How To Remove The Electrical Parts66
Contactor66
Terminal Block66
Controller Board66
How To Remove The Control Box67
How To Remove Water Pump (Primary Circuit)/Pump Valve/Strainer Valve68
Water Pump68
Pump Valve68
Strainer Valve69
Strainer Cover (Debris Recovery)69
How To Remove The 3-Way Valve/3-Way Valve Motor69
How To Remove The Flow Sensor70
How To Remove The Booster Heater70
How To Remove The Thermostat/Immersion Heater72
Immersion Heater72
How To Remove The Plate Heat Exchanger73
How To Remove The Plate Heat Exchanger (P-Hex)74
How To Remove The Pressure Sensor74
How To Remove The Pressure Relief Valve/Manometer/Air Vent (Automatic)75
Manometer75
Pressure Relief Valve (3 Bar)76
Air Vent (Automatic)76
Pressure Relief Valve (10 Bar)76
How To Remove The Expansion Vessel77
How To Remove The Temperature And Pressure (T&P) Relief Valve77
How To Remove The Air Vent (Manual)77
How To Remove The Drain Cock (Primary Circuit)78
How To Remove The Drain Cock (Sanitary Circuit)78
How To Remove The Scale Trap (Sanitary Circuit)80
How To Remove The Liquid Refrigerant Temp. Thermistor81
How To Remove The Side Panels82
V/M Plate82
How To Remove The Drain Pan82
How To Remove The Back Panel83
How To Detach And Attach The Quick Connection84
Notes On Replacing The Parts85
Supplementary Information86
Back-Up Operation Of Boiler86
Installation & System Set Up86
Remote Controller Settings86
Service And Maintenance87
Engineers Forms87
Commissioning/Field Settings Record Sheet88
Annual Maintenance Log Book90
Parts Which Require Regular Replacement90
Parts Which Require Regular Inspection90