DE DIETRICH NEO 2.1 - Manual (Page 62)

4.6.3. Pipe insulation
CAUTION
To protect the insulation against mechanical damage, bird
pecking and UV light, add extra protection for the heat
insulation sleeves in the roof area by using an aluminium
sheet sleeve or aluminium adhesive tape. This additional
protection must be sealed with silicone.
4
If different copper pipes are used, the insulation must be:
- Resistant to constant temperatures up to 150 °C in the collector
zone and the hot outlet and also down to - 30 °C.
- Insulation preferably waterproof and continuous.
- with a thickness equal to the tube diameter and with a K
coefficient of 0.04 W/mK.
50 % reduction of the insulation is permitted when passing
through the roof and walls.
4
Recommended materials for temperatures up to 150 °C:
- Duo-Tube
- DuoFlex
- Armaflex HT
- mineral wool
- glass fibre
4.7 Filling the system
CAUTION
4
Do not fill / rinse a hot solar collector. Risk of being
burnt.
4
Before the filling of the installation, to check the
preload of the expansion vessel according to the
static height (Preload = static Height/10 + 0.3 bar).
4
check the connection to the series of collectors and
the collector sensor connection.
4
Since propylene glycol leaks much more easily than
water, check all connections and gaskets for leaks
after a few hours of operation at working pressure.
Following installation of the solar panels and hydraulic connection of
the panels and piping, the system can undergo pressure tests and be
filled. When doing so, the thermal conditions and the particular
features of the installation must be taken into account. For that
reason, the system may only be filled, commissioned and maintained
by a suitably authorised technician.
Bring the pressure in the primary solar circuit up to the 2 bar working
pressure by topping up if necessary with heat transfer fluid.
M001704-A
4. Installation NEO 2.1 / SUN 211
61 30/11/2011 - 300021356-001-F