Inhaltsverzeichnis - Mitsubishi Electric EHST20-Serie Installationshandbuch

Contents
1. Safety notices ................................................... 2
2. introduction ....................................................... 4
Overview of the System .................................................. 4
How the Heat Pump Works ............................................. 4
Overview of the Controls ................................................ 5
3. technical information ...................................... 6
Product specification ....................................................... 6
Component Parts ............................................................ 7
Technical Drawings ......................................................... 9
Unit Compatibility .......................................................... 0
4. installation....................................................... 12
4.1 location .............................................................. 12
Transportation and Handling ......................................... 2
Suitable Location .......................................................... 2
Service access diagrams .............................................. 2
Room Thermostat ......................................................... 2
Repositioning ................................................................ 2
4.2 Water Quality and System Preparation ........... 13
General ......................................................................... 3
New Installation ............................................................ 3
Existing Installation ....................................................... 3
How to access Internal Components and Control Box...... 3
4.3 Water Pipe work ................................................. 13
Hot Water Pipe work ..................................................... 3
Cold Water Pipe work ................................................... 3
Hydraulic filter work (ONLY EHPT series)..................... 3
Pipe work Connections ................................................. 4
Insulation of Pipe work .................................................. 4
Filling the System (Primary Circuit)............................... 4
Sizing Expansion Vessels ............................................. 4
Water Circulation Pump Characteristics ....................... 4
Safety Device Connections ........................................... 5
Accessories (Included)
Main controller cover

Abbreviations and glossary
Abbreviations/Word Description
Ambient temperature The outdoor temperature
Freeze stat. function Heating to prevent water pipes freezing
ASHP/HP Air source heat pump
Coefficient of performance the efficiency of the heat pump
COP
Cylinder unit Indoor unvented DHW tank and component plumbing parts
DeltaT Difference in temperature between two variables
DHW mode Domestic hot water heating mode for showers, sinks, etc
Flow rate Speed at which water circulates around the primary circuit
Flow temperature Temperature at which water is delivered to the primary circuit
FTC3 Flow temperature controller, the circuit board in charge of controlling the system
Compensation curve mode Space heating incorporating outdoor temperature compensation
Heating mode Space heating through radiators or UFH
Legionella Bacteria potentially found in plumbing, showers and water tanks that may cause Legionnaires disease
LP mode Legionella prevention mode - a function on systems with tanks to prevent the growth of legionella bacterium
Packaged model Plate heat exchanger in the outdoor heat pump unit
Refrigerant A compound used within the heat cycle that goes through a phase change from gas to liquid
Split model Plate heat exchanger in the indoor unit
TRV Thermostatic radiator valve - a valve on the entrance or exit of the radiator panel controlling the heat output
Under floor heating - a system of water carrying pipes under the floor, that warms the floor surface
UFH

Adjustable feet Immersion heater boss tool
EH*T20*-*M*HA model only
4
4.4 Safety device discharge Arrangements (G3) .........16
4.5 refrigerant Pipe work ........................................ 17
Precautions ................................................................... 7
Connecting Pipes .......................................................... 7
4.6 electrical Connection ......................................... 18
5. System Set Up ................................................ 22
5.1 diP Switch Functions ......................................... 22
5.2 Connecting external input/output ........................ 23
5.3 remote Controller Options ............................... 24
Remote Installation of Main Controller .......................... 25
5.4 Main Controller ................................................... 26
Setting the Main Controller ........................................... 28
Initial Settings .............................................................. 28
Main Settings Menu ...................................................... 28
Mode  - DHW/Legionella Prevention .......................... 29
Mode 2 - Heating .......................................................... 30
Mode 3 - Schedule ........................................................ 32
Service Menu ................................................................ 33
6. Commissioning ............................................... 38
Pre-commissioning Exercises - Potable/DHW circuit ... 38
Pre-commissioning Checklist ........................................ 38
7. Service and Maintenance............................... 39
Basic Troubleshooting for Cylinder Unit ........................ 39
Annual Maintenance ..................................................... 40
Error Codes................................................................... 40
Engineers Forms .......................................................... 4
Annual Maintenance Log Book ..................................... 42
8. Supplementary information (Pump down) ... 43
Pressure relief valve (3 bar)

Pressure relief valve (10 bar)
Except EHPT20X-VM2HA
 2