Contents
Supporting documents ......................................................................................................................................................... 2
Section 1: Introduction ............................................................................................................................................................. 6
What are the benefits of a heat pump? ................................................................................................................................ 6
How a heat pump works ....................................................................................................................................................... 6
Intended Use ........................................................................................................................................................................ 6
Air as a heat source ............................................................................................................................................................. 6
Advantages of inverter compressors .................................................................................................................................... 6
Advantages of fixed speed compressors .............................................................................................................................. 7
Heat pump labelling .............................................................................................................................................................. 7
Comparison of the LA MS and LA MI ranges ....................................................................................................................... 7
Section 2: Selection and sizing of the heat pump ..................................................................................................................... 8
Process to select a heat pump ............................................................................................................................................. 8
Mono energy operation......................................................................................................................................................... 8
Accurately determining the building‟s heat loss .................................................................................................................... 8
Estimating the building‟s heat loss ....................................................................................................................................... 9
Dimplex design service......................................................................................................................................................... 9
Drying-out of buildings .......................................................................................................................................................... 9
Sizing example 1 ................................................................................................................................................................ 10
Sizing example 2 ................................................................................................................................................................ 10
Section 3: System controls in a domestic setting .................................................................................................................... 11
Boiler inter lock ................................................................................................................................................................... 11
Horstmann PRT thermostat ................................................................................................................................................ 11
Heat Pump Controller ......................................................................................................................................................... 11
Weather compensation....................................................................................................................................................... 11
Section 4: Selection of heat emitters and flow temperatures .................................................................................................. 12
Minimising the flow temperature ......................................................................................................................................... 12
Considerations for fan convectors ...................................................................................................................................... 12
Section 5: DHW preparation with inverter heat pumps ........................................................................................................... 13
Dimplex EC-Eau cylinder range ......................................................................................................................................... 13
Dimplex ECS Combination DHW and Buffer Cylinders ...................................................................................................... 13
Heat pump power for hot water preparation ....................................................................................................................... 13
Selecting a DHW cylinder ................................................................................................................................................... 13
Cylinder volume and reheat ................................................................................................................................................ 14
Cylinder replacement ......................................................................................................................................................... 14
Selecting and controlling the DHW temperature ................................................................................................................. 14
Sterilisation ......................................................................................................................................................................... 15
Secondary circulation pipes ................................................................................................................................................ 15
Section 6: Installation considerations ...................................................................................................................................... 16
Physical location ................................................................................................................................................................. 16
Fixing of the heat pump ...................................................................................................................................................... 16
Wall mounting ..................................................................................................................................................................... 16
Ventilation ........................................................................................................................................................................... 17
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