PRODUCTS
On reaching the set temperature, the obturator
(1), governed by the thermostatic sensor (2),
modulates the closure of the hot water outlet
(3), thereby aiding circulation towards the other
connected circuits. If the temperature decreases,
there is the opposite action and the passage
reopens, so as to ensure that all the branches of
the system reach the required temperature.
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PRODUCTS
63
The adjustment strainer can be removed
from the valve body for checking, cleaning or
replacement.
Temperature adjustment
The temperature is set at the desired value by
turning the upper screw with the special knob.
System sizing
The thermostatic regulators are used for automatic
balancing of the various branches of domestic hot
water recirculation circuits, so as to ensure the
required temperature in each section and limit heat
dispersion. The recirculation circuits are generally
sized according to the flow rate required for each
branch, based on the allowed heat dispersion
and the corresponding decrease in temperature
along the pipe. Generally speaking, the maximum
allowed temperature drop between the point of
departure from the central system and the point
of return to the latter is 5°C. According to the flow
rate, determined using the various calculation
methods, it is possible to calculate the head loss
caused by passage through the thermostatic
regulator, using the graphs provided below.
The head loss curves are shown with valve
in thermostatic operating mode. In this case,
reference is made to an average aperture of
5K, between the valve set temperature and the
incoming water temperature, bearing in mind the
dispersion along the pipe. This value allows the
head required for the recirculation pump to be
limited. It is also always necessary to ensure the
minimum flow rate required by the mixing valves
in the central system. The suggested control range
is from 55 °C to 60 °C (according to current
standards). Factory setting 58 °C.
Installation
Before fitting the thermostatic regulator, the
pipes must be flushed to ensure that none
of the impurities in circulation will reduce its
performance. We recommend always installing
strainers of sufficient capacity at the inlet from
the water main. The thermostatic regulator can
be fitted in any position, vertical or horizontal, by
respecting the flow direction indicated by the arrow
on the valve body. The thermostatic regulator must
be installed according to the diagrams given in
this manual. It must be installed in such a way as
to allow free access to the device, for checking
operation and maintenance.
The graduated scale shows the temperatures
at which the indicator can be set. It is
recommended to set the valve temperature
at a value about 5K greater than the water
temperature at the valve inlet, considering
the heat losses along the line, to limit the
head required at the recirculation pump. Take
care to ensure the minimum flow rate at the
mixing valves in the central heating system.
Adjustment locking
After adjusting the temperature, the setting
can be locked at the desired value using
the control knob. For this purpose, unscrew
the locking screw at the top of the control
knob, remove the knob and then put it back
on so that the internal reference couples
with the protrusion on the knob holder nut.
When this block is used, the reference of the
indication of the temperature values on the
knob is lost. To restore it, completely unscrew
the regulating headwork counter-clockwise.
Reposition the knob on MAX value. Tighten
the locking screw.
Maintenance
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March 2020 Volume 26 I Number 01
www.plumbingafrica.co.za
www.plumbingafrica.co.za