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Cylinder Installation Requirements
4
Water Supply
The water supply should be checked to ensure the pressure and flow rate are suitable for the Mitsubishi Electric
packaged cylinder (Maximum flowrate = 50 litres/minute, Maximum pressure = 3 bar). If necessary consult the local
water company regarding the likely pressure and flow rate availability.
If measuring the water pressure note that a high static (no flow) mains pressure is no guarantee of good flow
availability. In a domestic installation 1.5 bar and 25l/m should be regarded as the minimum pressure/ flowrate.
Consideration should be given to upgrading existing ½" (15mm) cold mains pipework to a larger size, if the
recommended minimum pressure/ flowrate is not being achieved.
Siting the Cylinder
The minimum recommended cupboard floor area is 750mm x 750mm, the minimum height will be dependent on
the size of cylinder used. In all cases an extra 300mm clearance should be allowed from the top of the cylinder for
connection of the hot water draw off pipework.
Outlets above the cylinder will reduce the outlet pressure available by 0.1 bar for every 1m of height difference.
The unit should be protected from frost. Particular care is needed if siting in a garage or outbuilding. All exposed
pipework should be insulated. The cylinder must be installed vertically on a flat base capable of supporting it's
weight when full.
Access for maintenance of the valves should be considered. The immersion heaters are 375mm long and care
should be taken that they can be withdrawn for servicing if required. The discharge pipework from the safety valves
should fall continuously and terminate safely in accordance with approved document G3 of the current building
regulations.
Solar Connections
Where available these are designed to allow the input of solar thermal to complement the Ecodan
volumes of water covered by the solar thermal input are shown in the following table. The domestic Heating
Compliance Guide L1A and L1B offer advice on the sizing of solar thermal systems.
Model
HUS210FTC4ST
HUS250FTC4ST
HUS300FTC4ST
Designated Solar Volume
65
90
100
. Dedicated
®
Heat Pump Volume
Total Volume
145
160
200
FTC4 Installation Manual
210
250
300
7
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