Table Of Contents - Mitsubishi Electric EHST20 Series Operation Manual

Contents
1. Safety Precautions ........................................... 2
Disposal of the Unit ......................................................... 2
2. introduction ....................................................... 3
Overview of the System .................................................. 3
How the Heat Pump Works ............................................. 3
Economical Best Practice ............................................... 4
Overview of Controls ...................................................... 4
3. your Heating System ........................................ 5
System Configuration ..................................................... 5
Important Parts of the Units - Points to Note .................. 5
Product Specification ...................................................... 6
4. Customising Settings for your Home ............. 7
Main Controller ............................................................... 7
General Operation .......................................................... 8
Changing Initial Settings ................................................. 8
Schedule ......................................................................... 9
Holiday Mode ................................................................ 0
Heating Mode ............................................................... 0
Domestic Hot Water (DHW) / Legionella Prevention .....
Service Menu ................................................................ 2
5. Service and Maintenance............................... 13
Troubleshooting ............................................................ 3
Maintenance ................................................................. 3
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
Hydrobox Indoor unit housing the component plumbing parts and a plate heat exchanger
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