Keston Thermomatic RSM20/FB, Installation & Servicing Instructions Manual, Page: 27 / 46

Page 27
Fig. 7.6. CONDITION 6.
The circulation pump starts,
do the radiators get hot?
Are the htg ballafix valves
open?
Open them
Is the flexible filling pipe
squashed?
Is the boiler full of w ater?
Is there no w ater or too low
pressure in the w ater
supply?
Open the cap of the vent valve
and let the air escape. Can the
boiler and the system get
filled?
Check the filling loop
valves.
Let the air escape from the
various vents of the htg.
system.
Is the non-return valve
blocked?
I the domestic
w ater regulatory
ball valve closed?
No
Yes
No
Fill the boiler and the system
up to 1 bar of pressure.
Restore the w ater
supply.
Open it.
Set it in order or replace
it.
Is the pump speed sufficient?
Is the AT set too high?
Unblock or replace it.
Set the pump on high speed, acting on the
proper button.
No
See condition 7
Is there air in the radiators
or in the htg. system?
Is the pump head insufficient?
Set the head variator of the pump at
maximum.
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
Yes
Yes