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Suitable Plumbing Systems
Gravity Fed:
The thermostatic mixer must be fed from a cold water cistern (usually fitted in the loft space) and
a hot water cylinder (usually fitted in the airing cupboard) providing nominally equal pressures.
Gas Heated System:
The thermostatic mixer can be installed with a combination boiler.
Unvented Mains Pressure System:
The thermostatic mixer can be installed with an unvented, stored hot water system.
Mains Pressurised Instantaneous Hot Water System:
The thermostatic mixer can be installed with systems of this type with balanced pressures.
Pumped System:
The thermostatic mixer can be installed with an inlet pump (twin impeller). The pump must
be installed on the floor next to the hot water cylinder.
General
Installation must be carried out in accordance with these instructions, and must be conducted
by designated, qualified and competent personnel.
The installation must comply with the "Water Supply Regulations 1999 (Water Fittings)" or any
particular regulations and practices, specified by the local water company or water undertakers.
Note! Make sure that all site requirements correspond to the information given in section:
'Specifications'. For Type 2 and Type 3 Valves see also supply conditions in the TMV2 and
TMV3 Requirements Manual
1.
The product must not be installed in an area where it may freeze. Pipework to the product
that could become frozen must be properly insulated.
2.
Do not install the product in a position in which service access is restricted.
3.
For stud partitions alternative fixings may be required.
4.
Isolating valves must be installed close to the product for ease of maintenance.
5.
Pipework must be rigidly supported and avoid any strain on the connections.
6.
Pipework dead-legs should be kept to a minimum.
7.
If pipework enters the product from the rear through a hole in the wall, provision must be
made to prevent water ingress back into the wall structure.
8.
The position of the shower and shower fittings must provide a minimum gap of 25 mm
between the showerhead and the spill over level of any bath, shower tray or basin and
a minimum gap of 30 mm between the showerhead and the spill over level of any toilet,
bidet or other appliance with a Fluid Category 5 backflow risk (see diagram).
Note! There will be occasions when the hose retaining ring will not provide a suitable solution
for Fluid Category 3 installations, in these instances an outlet double checkvalve must be
fitted, this will increase the required supply pressure typically by 10kPa (0.1 bar). Double
checkvalves fitted in the inlet supply to the appliance cause a pressure build up, which affect
the maximum static inlet pressure for the appliance and must not be fitted. For Fluid category
5 double checkvalves are not suitable.
INSTALLATION
8
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