Installation guide

Solarflo - Solar Thermal Domestic Hot Water System 7
5.0 Ancillary components
5.1 Expansion vessel
Membrane expansion tanks for solar primary heating
circuit. Manufactured according to the Directive PED
97/23/CE (approved noZ-DDK-MUC-02-396876-04).
Butyl membrane suitable for solar primary heating fluid,
DIN 4807-3 approval.
Maximum working temperature +110°C.
Maximum percentage of glycol 50%.
Connection: 3/4” BSP male parallel
Expansion vessel supplied with wall mounting bracket
and self sealing vessel connection that will allow removal
of the vessel for maintenance without losing solar heat
transfer fluid.
5.2 Solar heat transfer fluid
Pre-mixed (40% glycol / 60% water) Solar thermal
transfer fluid. Based on1,2 - propylene glycol with
corrosion inhibitors.
Non-toxic, odourless, bio-degradable.
The use of chemical resistant gloves and suitable eye
protection is required when handling.
A full safety data sheet is available on request.
Supplied in 20litre container.Weight of container full - 21kg.
5.3 Thermostatic Blending Valve
Can be set to control the hot water delivered to the
user outlets to a safe working temperature enabling the
solar cylinder to store water at a higher temperature.
Connections: 22mm compression
Max working pressure (static): 14 bar
Max working pressure (dynamic): 5 bar
Min working pressure (dynamic): 0.2 bar
Max inlet pressure ratio: 2:1
Min flow required for stable control: 5 l/min
For pressure drop diagram and dimensions see Fig. 6.1
& Fig. 6.2
NOTE: For optimum operation the cold connection must
be taken from a balanced cold water feed.
Ø300mm
392mm
3
/4”
Expansion vessel
Fig. 5
Flow l/s
Pressure Loss kPa
0.2 0.3 0.4 0.5 0.7 1.0 1.4 2
30
40
50
70
100
120
140
160
180
200
22mm
28mm
60mm
81mm
92mm
22mm
22mm
Hot
Mix
Cold
Fig. 6.1
Fig. 6.2