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Domestic Hot Water (DHW) is normally maintained at around 50°C in the hot water cylinder thus
preventing the growth of harmful bacteria even in normal use. However, protection against the growth
of legionella bacteria is provided by periodically raising the water temperature in the DHW cylinder.
The heat pump provides a variable power output depending on the heating and hot water load. The
power output variation is achieved by a variation of speed of the compressor and fan systems within the
heat pump. The control of the heat pump power is maintained at optimum efficiency and effectiveness
by the Advanced System Controller (ASC). Heating and hot water load is determined automatically by
the use of sensors which monitor the outside air temperature, indoor temperature and water system
temperatures.
Full heat loss calculations in accordance with BS EN 12831 must be carried out by the system designer in
order to accurately determine the size of the required Heat Pump.
At the time of writing, planning permission is not generally required for air source heat pumps in the
United Kingdom. However, planning considerations and calculations must be carried out in accordance
with MCS 020 which can be found on the following web site:
http://www.microgenerationcertification.org/mcs-standards/installer-standards
Note: The Yutaki heat pump has been approved under the Micro-generation Certification Scheme
(MCS). The installer of the equipment must also be accredited under MCS for the appropriate
technology and the installation must meet the requirements of MCS in order to be eligible for any
benefit under the Renewable Heat Incentive (RHI) scheme.
Electricity supply authorities may need to be informed prior to installation of current using equipment.
Always check with your local distribution company before planning the installation.
