Hitachi Yutaki Heat Pump installation
I had a Air Source Heat Pump installed at the start of December 2011. This page is a summary of the installation details, with some links to specific posts on operating details assuming there is sufficient interest.
2 bed Bungalow, weather station Cambourne. 64m2 floor area, cavity wall insulation, 270mm loft insulation, double glazing. No gas, existing heating was electric storage heaters.
Hitachi Yutaki RHUE3-3AVHN1 Heat pump (monoblock Yutaki-M)
180l Gledhill solar/heat pump cylinder (in garage)
6 radiators (2 in lounge)
Hitachi system controller/weather compensation kit.
£8500, plus VAT, less £850 RPP and possible RHI energy credit (tbd)
(based on MCS calculations)
Building design heat load 5.6 kW
DHW recovery time from cold 40 min
Heating season 30 weeks
Yearly heating use 20000 kWh
Heat pump running cost pa £705
Heat Pump seasonal COP 3.4
Electrical input 5667 kWh
Estimated energy saving =£1200-705=£420 (???)
Current operating parameters
I changed these significantly from the installed values.
P4 0.6 (Compensation curve)
P6 43 (Max Flow – good for -3 centigrade overnight)
P7 5 (room temp compensation)
P10 51 (DHW setpoint)
P11 5 (DHW range)
P12 3 (add to P10 for DHW flow setpoint)
Important for summer operation: EP35=0s. (Set/Sel/’i’ together for engineering parameters)
I changed a few others, but I’m reading from the french version of the instructions, and there is some guesswork involved!
Stats Jan 2012
Energy use 190 kWh (Week 5)
Water heat 340 kWh (COP 1.79)
(Whole house electric consumption 225 kWh)
January whole house 850 kWh
Data logs are here
Real-time monitor stats are here
All posts on the subject of heating can be found here