S-CB Px 120 Manual
19
The delta T monitoring parameters have been set so, that a malfunctioning of the pump or an extreme resistance
in the hydraulic system will be detected by the burner controller. When the limits of these parameters are exceed-
ed, the display message “dT Block” will be displayed. This message will disappear when the delta T is within limits
again, if not the boiler will go into a lock out after 45 seconds and the display will blink with the message “Flow-
Return dTfault” (see also § 16.1. , page 90 ff).
ON/OFF pump
If an on/off pump is used, it must be connected to the P3 control (23-24-25).
When this pump has multiple speed settings, make sure it is set at the highest setting and
do not change this
setting.
The boiler has an internal pump switch that has a programmable delay before it turns off (also for hot
water supply this delay is programmable).
The pump starts running in case of a heat demand. When heat demand stops, the pump will continue to run for a
programmed period and after that it will stop. The pump and (when installed) the three-way valve or hot water
pump for the calorifier can be activated every 24 hours (for a programmable period). This 24-hour cycle starts as
soon as the power supply of the boiler is connected.
6.8.
Frost protection
The boiler has a built-in frost protection, which is automatically activating the CH pump when the boiler return
temperature drops below the 5°C. When the boiler return temperature drops below the 3°C, the burner is also
ignited. The pump and/or burner will shut down as soon as the return temperature has reached the 10°C. The
mentioned temperatures are related to the temperatures measured by the RETURN sensor of the boiler. This
frost protection function will not fire up the boiler in case of a “general blocking” of the burner demand.
NOTICE: This frost protection is only to reduce the risk of frost damage to the boiler, not the whole system.
Be aware that flow restrictions in the system, caused by frozen pipes, will also prevent the water flow, needed for
the boiler frost protection function to work. Because it concerns a programmable setting, boiler damage caused by
frost/freezing will affect warranty.
6.9.
Installing a strainer and/or dirt separator
Always install a strainer (water filter)
and/or a dirt separator in the return pipe
of the boiler; in such a way that the wa-
ter going to the boiler is free of any de-
bris/particles. When using a water filter
always check a week after installation to
determine the strainer cleaning interval.
Advice is to mount valves before and
after the strainer, including an air bleed
valve, so the strainer can be isolated
from the heating circuit for service oper-
ations. Clean water is very important,
blocked and/or polluted heat exchang-
ers, including failures and/or damages
caused by this blockage are not covered
by the warranty.
SYSTEM WITH DIRT SEPARATOR
SYSTEM WITH STRAINER
SYSTEM WITH STRAINER AND DIRT SEPARATOR
DIRT SEPARATOR
DIRT SE-
PARATOR
WATER RE-
TURN FROM
SYSTEM
WATER
RETURN
FROM
SYSTEM
WATER
RETURN
FROM
SYSTEM
WATER FLOW
TO BOILER(S)
WATER FLOW
TO BOILER(S)
WATER
FLOW TO
BOILER(S)
DIRT
BLEED
VALVE
DIRT
BLEED
VALVE
AIR
BLEED
VALVE
AIR
BLEED
VALVE
VALVE
VALVE
VALVE
VALVE
STRAINER
(WATER FILTER)
STRAINER
(WATER FILTER)
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