16. Is an air source heat pump suitable for an existing house as a replacement for a gas or oil fired boiler?
It is unlikely that an air source heat pump will be considered as a direct replacement for an existing boiler, unless the present system is considerably updated to ensure that the air source heat pump can sufficiently heat the property. This will include a full and detailed heat loss calculation, radiator replacement, cylinder replacement, as well as an assessment and possible upgrade of the properties insulation. However an air source heat pump can always be used as the main heating source, provided a back up system is also incorporated.
17. What are monovalent and bivalent systems, and which is best?
With a monovalent system, the heat pump is designed to provide all the required heat. Initial capital costs however, may mean it is more economical to use a bivalent system where the heat pump only covers the base heating load. An additional heat source e.g. oil boiler, gas boiler, or electric back up, will meet the remaining peak demand. Which system to choose, purely depends on the home and heating requirements.
18. What type of controls should I use?
It is perceived that the ideal heating arrangement for ASHP installation is a well designed under floor heating system that uses low temperature water as its heating medium. The controls for the system will be as specified by the underfloor heating manufacturer. A temperature sensor on the heating system, will control the running of the water circulating pump in the air source heat pump, to achieve the required target temperature. If the heat pump is to also be used as a supplement for domestic hot water, via an indirect cylinder, then a traditional 'S-plan' type arrangement can be used.
19. How easy is a Detian air source heat pump to install? Air source heat pump is supplied fitted with the weather compensation unit and electrical backup. Only two pipe connections are required from the house: heating system flow and return, and an electrical supply. The heat pump itself should be placed at least 300mm from the wall to ensure that there is an unobstructed air flow to the unit.The electrical supply should be fed from a dedicated MCB with a suitable external isolation switch, situated near the heat pump.
20. What cable size should be used to connect the air source heat pump to the mains supply?
Cable size will vary dependent upon the size of heat pump installed, type of cable and its length of run. We recommend that all electrical work is carried out by a registered and qualified electrician, in accordance with current legislation.
More information please visit our website: http://www.fsdetn.com/en/
