Hitachi RWM-(H)FSN3E, Руководство по обслуживанию

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4 Electrical wiring
SMGB0070 rev.1 - 08/2011
104
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Electric heater
The electric heater is made of Incoloy alloy 825 and complies with the European Low Voltage Directive 2006/95/EC.
It comprises a flange that holds three U-Shaped heating elements for 2.5kw power resistances.
Replace electric heater
The steps to be followed are:
1 Totally disconnect the unit from the main power supply.
2 With the help of a tool remove the heater to be replaced. Be careful not to damage the enamel surface in case of
enamelled tanks.
3 Insert the new heater in the same position as the old one.
4 Connect again and plug into the main power supply.
Safety measures
Before any intervention, totally disconnect the DHWT from the main power supply. All the connections circuits must be
disconnected.
Installation, configuration, start up and maintenance of heating elements must be carried out by an authorised electrical
fitter. All standards and regulations must be observed.
The user is responsible of ensuring that the essential requirements of the European Low Voltage Directive are respected.
Electric heating elements generates high temperatures. Precautions should be taken to protect goods and persons from
accidental burns during the operation and after the equipment has been disconnected or installed.
Note minimum cable section: Resistances of 2.5kW recommended cable: H05SJ-K accordance with UNE 21027, and will
have at least 2.5mm² section.
The tanks must be with a DHWT temperature control thermostat and an all-pole limiter thermostat (the setting of these
two components must be compatible with the design parameters of storage tanks). The sensors must always be located
at a higher level than the electric heater element.
We recommend installing appropriate safety devices (temperature safety device, safety level for heating liquids by natu-
ral convection, flow safety device for liquids in circulation, etc.).