14
TECHNICAL ASSISTANCE CENTRE
Topping up or changing the heat transfer liquid
For certain maintenance operations (such as replacing
pipes or unions or changing the heat transfer liquid) the
solar collector (primary) circuit may have to be drained.
Proceed as follows:
- Connect a hose to the hose union on the filling/drain
cock (1).
- Open the cock (1).
- Remove the safety valve (2) to allow air into the pri-
mary circuit and allow the heat transfer liquid to flow
out.
b
Only use the products listed in the
B
Catalogue
to top up the circuit.
b
In areas where there is a significant risk of freezing,
take particular care over tightness testing and flush-
ing with water.
b
DO NOT drain the solar collector circuit under sun-
ny conditions or when the collectors are hot.
Cleaning inside the storage cylinder
Proceed as follows to clean inside the storage cylinder:
- Close the domestic cold water inlet cock.
- Connect a hose to the storage cylinder drain cock
(D) fitted on installation, and open the cock. Leave
the water run out until the tank is completely empty.
- Unscrew the fixing screws and remove the flange
cover (1) from the left of the storage cylinder.
- Remove the nuts (2) and screw the bolt (3) in to re-
lease the flange (4) from the tank.
- Remove the flange (4). Check and clean the inside
of the tank.Check the condition of the seal (5). Re-
place if necessary.
- Check the magnesium anode (6) for wear and re-
place it if necessary.
- On completion of cleaning, follow the above steps in
the reverse order to refit all removed parts.
b
Screw the bolt (3) out until the flange fits snugly
against the tank. Tighten the nuts (2) to secure the
flange (4), proceeding diagonally around the flange
to apply pressure uniformly around the seal.
2
1
EAF
UAC
Sc
1
2
4
6
5
3
