Riello 20082277, Instructions For The Installer And For Technical Assistance, Page: 32 / 36

32
MAINTENANCE
ENGLISH
Proportional head
The circulation unit works on the basis of the heat request made
by the system. The working point of the circulation unit and the
selected proportional head curve move on the basis of the heat
request
PP1 PP2 PP3
PP1 LOW proportional head curve
PP2 AVERAGE proportional head curve
PP3 HIGH proportional head curve
Constant head
The circulation unit works at constant head, irrespective of the
heat request. The working point of the circulation unit will move
along the selected curve on the basis of the heat request.
CP1 CP2 CP3
CP1 LOW constant head curve
CP2 AVERAGE constant head curve
CP3 HIGH constant head curve
Constant curve
The circulation unit works at constant speed, irrespective of the
heat request from the system. The working point of the circula-
tion unit will move along the selected curve on the basis of the
heat request.
C1 C2 C3 C4
C1 Curve 1 = 4 metres
C2 Curve 2 = 5 metres
C3 Curve 3 = 6 metres
C4 Curve 4 MAX = 7 metres
3.3 Setting high temperature system
Set the heating temperature selector of the boiler to the value
required for the high temperature system.
3.4 Checks after commissioning
Once commissioning has been completed, check:
− the plumbing circuit for leaks
− that the heating system is pressurised
− that the main switch for the system works
− that the electrical connections are correct.
9
If even one of these checks provides a negative result, the
system is to be switched off and must not be started up
again until the fault has been eliminated.
4 MAINTENANCE
4.1 Cleaning
Disconnect from the power supply before carrying out any clean-
ing operation by setting the main switch to “off”.
The panelling is to be cleaned with a damp cloth using soap and
water.
If there are stubborn stains, use a cloth with a 50% water and
denatured alcohol mixture, or use speci fi c products.
Dry carefully after cleaning.
0
Do not use abrasive products, benzene or trichloroethylene.
4.2 Draining the BAG
Before starting draining operations, set the main switch to
“off”.
To drain the BAG 3 :
− Close the shut-off cocks on the side of the system (if pres-
ent)
− Connect a small pipe to the drain cock (1)
−
1
Using a CH11 wrench, open the cock (1) without unscrew-
ing it completely
− After having drained the BAG 3 close the cock (1) again.