Protherm 24(12) KTO Operation And Installation Manual - Service and Maintenance
11
Pump protection
Switching the pump on for a short time
(approx. 20 s) when it has been in the
room continuously for 23 hours ensures
protection against blocking or sedimenta-
tion when the pump has been idle for a
longer period of time.
Important:
This function of the boiler can-
not be blocked.
Running down of pump
After heating of the hot water, the running
down time of the pump is set at 30 s.
During heating of the heating water the
running down time of the pump is set at 3
min. The maximum settable run down time
of the pump is 60 min.
Important:
This function is active only in
the case of a boiler with mains voltage.
Anti-cycling
The boiler is equipped with an anti-cycling
function. The time after which the boiler is
switched back on is automatically calcu-
lated by the control panel with regard to
the conditions in the boiler.
Disconnection of boiler from mains
Disconnect the boiler from the power
supply only during service interventions
or when boiler is idle for longer periods
(see chapter “Shutting the boiler down” on
page 8). Upon disconnection of the boiler
from the power supply all protective func-
tions of the boiler are deactivated.
Power failure
Power failure will turn the boiler off. When
power supply is restored, the boiler will
automatically restart itself without losing
any of the operating parameters settings.
If the red LED (Fig. 1, position 5) is lit on
the control panel after electrical power
supply restoration, proceed according to
the instructions in the section Starting up
and shutting down boiler.
Note:
The boiler may be blocked as a
consequence of overheating caused by
the pump being switched off as a result of
power failure. Rectify this fault by pressing
the RESET button on the boiler control
panel. If the fault persists call an authori-
sed service.
Safety valve
The boiler is equipped with a safety valve
with an opening pressure of 3 bar. DO NOT
TOUCH THE SAFETY VALVE! Whenever
the safety valve starts releasing heating
water, switch off the boiler, disconnect if
from the electrical power supply and call a
service organisation. If the heating system
repeatedly loses pressure, consult your
service organisation.
Important:
All the mentioned electro-
nic protection functions are enabled only
when the boiler is connected to power
supply (the power cord plug is inserted
into a power socket and the main switch is
in the ON position (I).
Service and maintenance
Toping up water to the heating
system
Water to the heating system (only in small
quantities) can be topped up through the
boiler’s top-up valve (Fig. 3).
When topping up water, the following con-
ditions must be met:
1. Pressure of the water being supplied to
the boiler must be always higher than
the pressure of the water inside the hea-
ting system.
2. When toping up water, the boiler must
be cold (water temperature must not be
higher than 30°C).