Hitachi YUTAKI Series Service Manual

Contents
Service Manual
6
General index
SMGB0066 rev.0 - 12/2009
3.6. Electrical wiring diagrams............................................................................................................65
3.6.1. Electrical wiring diagram for models RHUE-(3~6)AVHN ........................................................................66
3.6.2. Electrical wiring diagram for RHUE-(5/6)AHN ........................................................................................67
4. Control system ...............................................................................................................................69
4.1. Systemconguration,settingsandcontrolsystem .....................................................................73
4.1.1. Description .............................................................................................................................................73
4.1.2. System controller overview ....................................................................................................................73
4.1.3. Contents of the controller pack ..............................................................................................................74
4.1.4. Quick-start installation steps ..................................................................................................................74
4.1.5. Abbreviations & terminology ..................................................................................................................75
4.1.6. Applicationcongurations ......................................................................................................................75
4.1.7. Principle of bi-valent or mono-energetic operation .................................................................................76
4.1.8. Mono-Valent Systems (CONF 1) ............................................................................................................77
4.1.9. Mono-Energetic Systems (CONF 2).......................................................................................................78
4.1.10. Bi-valent Systems - Parallel Operation (CONF3) ...................................................................................79
4.1.11. Bi-Valent System - Parallel Operation - Mixing Loop (CONF 4) .............................................................80
4.1.12. Bi-Valent System - Serial Operation (CONF 5) ......................................................................................80
4.2. Supply setpoint calculation ..........................................................................................................81
4.3. Heating control functions .............................................................................................................82
4.3.1. Heating Circuit – General .......................................................................................................................82
4.3.2. Heating Characteristic Curve (OTC Control) ..........................................................................................82
4.3.2.1. Room Setpoint Parallel Shift ..................................................................................................................................83
4.3.2.2. Room Temperature Compensation ........................................................................................................................84
4.3.3. Heating Circuit Minimum/Maximum Temperature Limits ........................................................................84
4.3.4. Heating Circuit (Secondary) Pump ........................................................................................................85
4.3.5. Automatic No-Load Function ..................................................................................................................85
4.4. DHW control functions.................................................................................................................85
4.4.1. DHW Storage Tank Loading ...................................................................................................................85
4.4.2. DHW Control ..........................................................................................................................................86
4.4.3. Maximum DHW Loading Time................................................................................................................87
4.4.4. DHW Electric Heater ..............................................................................................................................88
4.4.4.1. DHW Electric Heater ..............................................................................................................................................88
4.4.4.2. Using the Boiler for DHW loading...........................................................................................................................89
4.4.5. Using the Boiler for DHW loading ..........................................................................................................90
4.4.6. Response of the Heat pump to a DHW demand ....................................................................................90
4.4.7. DHW Time Program ...............................................................................................................................90
4.5. Heatpump control functions.........................................................................................................91
4.5.1. Heatpump Control ..................................................................................................................................91
4.5.2. Heatpump Setting Control Signal ...........................................................................................................92
4.5.3. Heatpump Sensor Offset ........................................................................................................................92
4.5.4. Heatpump Maximum Return High Limit .................................................................................................93
4.5.5. Heatpump Operating Limits ...................................................................................................................93
4.5.6. Tariff Switch (Heat Pump blocking) Input ...............................................................................................94

Hitachi YUTAKI Series Specifications

General

Heating Capacity	5.0 kW - 16.0 kW
Cooling Capacity	5.0 kW - 16.0 kW
Energy Efficiency Class	A+++
Refrigerant	R32
Operating Temperature Range (Cooling)	46°C
Noise Level (Indoor Unit)	45 dB
Noise Level (Outdoor Unit)	45 dB