Protherm Tiger 24 (12) KTZ Operating And Installation Manual - Protection Against Freezing
Supplied By www.heating spares.co Tel. 0161 620 6677
12
Example:
Select curve E5. At an outdoor
temperature of -10 °C the boiler provides
the heating system with a temperature of
70 °C. If the reference temperature shift
parameter P5 is selected at the same
time, then at an outdoor temperature of
15 °C the boiler will supply a temperature
of 38 °C. When the outdoor temperature
rises above 18 °C the HeW heating is swi-
tched off.
Protection against freezing
The boiler has an antifreeze protection
system which protects the boiler (but not
the heating and the hot water distribution
systems) against freezing.
When the HeW temperature in the boiler
drops below 4 ˚C, the boiler is automati-
cally switched on regardless of the room
control unit’s command, or regardless of
the HeW heating being switched off – pa-
rameter (--). When the HeW temperature
reaches 8 ˚C, the boiler is automatically
turned off.
Pump protection
When the pump has been continuously
idle for 24 hours, it is automatically swit-
ched on for about 30 seconds, to prevent
it from ceasing.
Anti-cycling
A function which prevents the boiler from
restarting the HeW heating cycle after the
boiler has been turned off sooner than the
time determined by the control board by
evaluating the required and actual HeW
temperature. This time is within the range
of 1 min 30 s and 5 minutes. The function
is most useful in heating systems where
the maximum thermal loss of the premi-
ses corresponds to the lowest level of the
boiler’s output range.
Protective functions
Setting boiler output
The factory setting of the boiler output is
15 kW to the heating system. During hea-
ting the HeW the boiler uses its maximum
nominal output of 24 (12) kW.
Important:
Changes in the boiler output
settings must be performed only by an au-
thorized service.
Disconnecting the boiler from power
supply
If the boiler is disconnected from power
supply for a protracted period of time
(continuously for a month or longer), we
recommend to start up the boiler in regu-
lar time intervals (at least once a month). If
the pump ceases, call an authorised ser-
vice. Repairing a pump ceased because
of dirt in the heating system is not covered
by the boiler warranty.
Important:
When the boiler is disconnec-
ted from the power supply, all protective
functions are disabled.
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 set operating parameters.
If after power supply restoration the LED
on the control panel (lightning symbol)
lights up, proceed in accordance with the
instructions in section Control and signals
/ Main switch.
The boiler may get blocked because of
overheating caused by the pump being
switched off as a result of the power fai-
lure.