Supplied By www.heating spares.co Tel. 0161 620 6677
13
Pump run-down
Pump run-down is factory set to 45 se-
conds after termination of the command
from the room control unit. If the boiler is
run without a room control unit, the pump
runs continuously.
If this mode is not acceptable, a second
setting is available which enables pump
run-down after 45 seconds from burner
flame out. This run-down mode is recom-
mended when the boiler is controlled wi-
thout a room control unit.
Important:
Changes in the pump run-
-down settings must be performed only by
an authorized service technician.
HeW safety valve
The boiler is equipped with a safety valve
on the HeW side. The valve opens when
the pressure in the heating system rea-
ches 3 bar. DO NOT TOUCH THE SAFE-
TY VALVE! If the safety valve starts relea-
sing heating water, always turn the boiler
off, disconnect it from power supply and
Service and maintenance
call an authorised service organisation.
If the heating system repeatedly looses
pressure, consult your service organisa-
tion.
Important:
All the above-mentioned
electronic protection functions are ena-
bled only when the boiler is connected to
power supply (the power cord plug is in-
serted into a power socket and the main
switch is in position (I)).
HoW tank safety valve
To prevent over pressure of water in the
tank due to heating, the boiler is fitted with
a safety valve (6 bar).
Tank protection
The inside of the tank is protected against
oxygen corrosion by a magnesium anode
that must be checked at least once a year.
The anode ruction depends also on the
water composition.
Note:
The magnesium anode is to be
checked only by an authorized service.
Topping up water in the heating
system
Water in the heating system (in small
quantities) can be topped up through the
boiler’s top-up valve (Fig. 6).
When topping up water in the system, the
following conditions must be met:
1. Pressure of the water supplied to the bo-
iler must always be higher than the water
pressure inside the heating system.
2. The boiler must be cold when being top-
ped up (HeW temperature must not ex-
ceed 30 ˚C).
3.
Recommended water pressure inside
the cold boiler (not more than 30 ˚C) is 1
to 2 bar.
Important:
If the water mains pressure is
lower or equal to the water pressure insi-
de the heating system, the heating water
may run into the water mains, which is for-
bidden. This danger is reduced by a built-
-in reverse valve installed downstream the
top-up valve.
This notwithstanding, the manufacturer
disclaims responsibility for any damages
caused by incorrect manipulation with the
top-up valve and a failure to abide by the
conditions specified above. Such dama-
ges and defects are not covered by the
boiler’s warranty.
