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for solar thermal systems, with solar regulator DeltaSol®
Circulation units
Function
Circulation units are used on the primary circuit of
solar thermal systems to control the temperature
in the hot water storage. The pump inside the
units is activated by the signal arriving from the
regulator. Moreover, safety and functional devices
for optimum control of the circuit are fitted in the
units.
They are available with flow and return connection
or with return connection only.
Some versions are also complete with the digital
regulator DeltaSol
®
C+ for solar thermal systems,
suitable for the operation and control of 9 different
types of solar thermal systems.
INST LL TION ND COMMISSIONING M NU L
INDEX
Function
Components
1
28199
+
268-269 series
1
2
3
4
5
6
7
8
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Summary of Contents for CALEFFI DeltaSol 268 Series
- Page 1 28199 for solar thermal systems, with solar regulator DeltaSol® Circulation units 268-269 series INST LL TION ND COMMISSIONING M NU L INDEX Function Product range Technical specifications Characteristic components Installation Filling the system Function Commissioning Circulation units are used on the primary circuit of solar thermal systems to control the temperature in the hot water storage.
- Page 2 NOTICE The following instructions must be read and understood before installing, commissioning and servicing the circulation unit. The safety symbol is used in this manual to draw attention to the respective safety instructions. The meaning of this symbol is as follows: N.B! YOUR SAFETY IS INVOLVED.
- Page 3 Technical specifications Performance Medium: water, glycol solutions Materials Max. percentage of glycol: Shut-off valves Max. working temperature: - deaerator side flow: 160°C Body: brass EN 12165 CW617N - pump side return: 110°C Check valve: brass EN 12164 CW614N Max. working pressure: 10 bar Temperature gauge: steel / aluminium...
- Page 4 Characteristic components 1) Grundfos Solar 15-65 circulation pump 2) Safety valve with adjustable outlet type 253 series 3) Fill/drain cock with control key 4) Instrument holder fitting with pressure gauge 75° 65° 5) Flow meter 12° 6) Deaerator with air vent 7) Flow temperature gauge 8) Return temperature gauge 9) Pre-formed shell insulation...
- Page 5 Installation • Fix the wall support bracket, using the fixing screws supplied in the pack (1). • Insert the rear insulation, through the notch provided (2). • Insert the unit components in the insulation using the special notches made in the bracket and the slots in the components. Block the components on the bracket, pulling them downwards to that they click into their housing (3).
- Page 6 Flushing the system • Close the flow meter regulating ball valve (1). Then open the fill/drain cock, by turning it counter-clockwise using the cap with control key (2). • By means of a (separate) external pump applied on the fill/drain cock of the safety unit (3), let the medium flow through the solar panels and the heat exchange circuit until the medium comes out of the fill/drain cock (4) of the flow meter.
- Page 7 Shut-off and check valves Flow meter The shut-off valves are equipped with a built-in check valve, The flow meter is a floating gauge flow rate measurator with a positioned inside the ball. built-in regulating ball valve. It works within the range of 1–13 l/min. 1.
- Page 8 Shut-off valve Application diagrams Pump Air vent Shut-off valve Expansion vessel Pump Temperature gauge Air vent Safety relief valve Expansion vessel Temperature gauge Safety relief valve Automatic filling Automatic filling...
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