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Cylinder Installation Requirements
4
General Considerations
The cupboard footprint needs to be at least 600mm x 600mm for the Pre-Plumbed Slimline Cylinder. The base
chosen for the cylinder should be level and capable of supporting the weight of the unit when full of water as shown
in chapter 8, technical data tables. The discharge pipework for the safety valves must have a minimum fall of 1:200
from the unit to a safe discharge point. All exposed pipework and fittings on the cylinder should be insulated. The
cylinder should NOT be installed in a location where the contents could freeze.
For new installations pipes should be insulated to comply with building regulations, the maximum permissible heat
loss is indicated in the table opposite, other considerations are as follows:
•
Primary circulation pipes for domestic hot water circuits
should be insulated through their length, subject only to
practical constraints imposed by the need to penetrate
joists and other structural elements.
•
All pipes connected to hot water storage vessels, including
the vent pipe, should be insulated for at least 1 metre from
their points of connection to the cylinder (or they should be
insulated up to the point where they become concealed).
•
For retrofit installations whenever a boiler or hot water
storage vessel is replaced any pipes that are exposed as
part of the work or are otherwise accessible should be
insulated as recommended for new systems, or to some
lesser standard where practical constraints dictate.
Water Supply
The water supply should be checked to ensure the pressure and flow rate are suitable for the Mitsubishi Electric
Pre-Plumbed Slimline Cylinder (Maximum flow rate = 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 / flow rate.
Consideration should be given to upgrading existing 1⁄2" (15mm) cold mains pipework to a larger size, if the
recommended minimum pressure / flow rate is not being achieved.
Siting the Cylinder
The minimum recommended cupboard floor area is 600mm x 600mm, 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 and primary 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.
Insulation of Pipework
Pipe Diameter
15mm
22mm
28mm
35mm
Pre-Plumbed Slimline Cylinder Installation Manual
Maximum Heat Loss
7.89 W/m
9.12 W/m
10.07 W/m
11.08 W/m
7
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