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For the qualified installer
2. Installation instructions
2.1 Unit structure
1 Cold water connection with filter
2 Hot water connection
3 Cover securing screw
4 Unit rear panel
5 Unit front cover
6 Fixing holes for under-sink installation
7 Snap closing catch
2.2 Delivery variants
MTH 350
MTH 350 with AHo 40 MTH
MTH 350 with AHu 40 MTH
MTH 350 with AHEu 40 MTH
2.3 Important information
Air in the cold water pipe will destroy the bare-wire heating system of the MTH.
If the water supply to the MTH has been interrupted, for example due to the risk of frost or work
on the water pipe, the following steps must be carried out before the system is used again:
1. Disconnect supply or disconnect the fuses.
2. Open a hot water tap downstream of the device for as long as is necessary for the device and the
cold water pipe to be freed of air.
3. Reconnect the supply or connect the fuses again.
All information in these Instructions for Use and Installation must be followed carefully. They provide
important information with regard to safety, operation, installation, and maintenance of the device.
2.4 Brief description
The MTH hydraulically controlled small-instantaneous water heater is a pressureless unit for the
heating of cold water in accordance with WRC Regulations, with which a water tap can be supplied.
The unit is suitable for hand washing basins, for example in guest WC’s, and for under-sink and
over-sink installation.
The bare-wire heating system is suitable for low-lime and limy water (see Table 2 for ranges of use).
2.5 Fittings
Only pressureless fittings may be installed. The MTH must not be exposed to any pressure. Never close
off the fitting outlet. Furring can close off the outlet and impair the function. For optimum jet patterns
use only the jet regulator supplied.
English
MTH 350 DE_GB.p65 14.04.2004, 10:4513
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