15-EN
INSTALLATION and OPERATION MANUAL
6.4. Installation of Temperature sensor
The solar collector temperature sensor should be coated with a thick layer of thermal paste and inserted
into the sensor sleeve to the full depth. If the fit is too loose, slide a piece of copper plate or wire in beside
the sensor, Seal the sensor sleeve opening with silicone sealant to prevent water ingress. Ensure that
sensors used on the collector are high temperature rated (up to 250
℃
/486F), in particular the cable.
6.5. Installation of safety valve (thermostatic or other)
According to safety norms, it is mandatory to install a thermostatic mixing valve. The valve is mounted on
the hot water pipe between DHW storage tank and bathroom/service room, in order to prevent scalding.
Through this valve you can control hot water temperature - below 50
℃
/122F (temperature is adjustable).
6.6. Pressure control. Temperature control. Relief valve.
Regardless of the installation configuration, pressure release values, expansion vessels and/or other
pressure control devices must be installed. The solar loop should be designed to operate at no
more than 800kPa - PRV may be 850kPa.
(800kPa =8bar=116psi
For installation where mains pressure water is used, the system should ideally be designed to operate at a
pressure of <500kPa, achieved by use of a pressure limiting/reduction value.
For the reliable operation of system, we recommend you check the lever of the pressure and temperature
return valve (PTRV) every six months. The PTRV lever should be raised and dropped gently without effort.
Collector working (operating) pressure should be secured using a pressure relief valve at 6 bars.
An expansion vessel must be mounted in order to take up the extra volume of fluid caused by heat
expansion. Recommended capacity of expansion vessel is 8 ÷ 10 L/m
2
of VTC type collector area.
To avoid damage to system and heat carrier circuit, all air purge valves must be closed upon purging
of air from the system. This will prevents the release of steam and the penetration of oxygen from
the ambient air.
6.7. Filling of system.
• To prevent overheating, the filling of system must be carried out in the morning or evening in the
absence of direct sunlight.
• Direct use of collector for hot water preparation is not allowed because of the eventual clogging of pipes
over a short time by lime scale deposits.
• Inside collector pipes and risers circulates a certain fluid (water, propylene glycol or Tyfocor of freezing
point corresponding to the requirements of certain installation (see section 6.1 of this manual.)When
using any other heat carrier fluid to fill the collector manufacturer does not take any responsibility for
product warranty.
