Regulation Of The Water Temperature; Protection Against A Shortage Of Water; Maximum Temperature Protection; Air Differential Pressure Switch - DeDietrich C 330 ECO Installation, User And Service Manual

C 330 ECO - C 630 ECO
31/05/2012 - 7600532-01
¼ For more information on controlling a modulating pump, See
paragraph: "Electrical connections", page 37.
If noises caused by flow in the system can be heard:
4 First of all, vent the heating system.
4 Reduce the maximum pump speed (Parameter MAX.PUMP
SPEED on DIEMATIC iSystem - Parameter p44 on
IniControl).
If circulation in the radiators is too weak or the radiators do not fully
heat up:
4 Increase the minimum pump speed (Parameter MIN.PUMP
SPEED on DIEMATIC iSystem - Parameter p43 on
IniControl).
¼ See the manual for the control panel.
3.3.4.

Regulation of the water temperature

The boiler is equipped with electronic temperature control based on
flow, return, and boiler block temperature sensors. The flow
temperature can be set between 20°C and 90°C. The boiler reduces
its power when the set outlet-temperature is attained. The cutout
temperature is the set heating outlet-temperature + 5 °C.
3.3.5.

Protection against a shortage of water

The boiler is fitted with a safety device to prevent the shortage of water
based on temperature measurements (Temperature difference
between flow and return). If ΔT = 25 K is reached (factory setting),
the boiler reduces its output by modulating to remain in operation as
long as possible. If ΔT ≥ 25 K the boiler goes into part load. If ΔT >
25 + 5 K the boiler goes into a normal control stop (blocking).
3.3.6.

Maximum temperature protection

The maximum protection switches the boiler off if the water
temperature is too high (110°C) and locks it on the control box. Once
the fault has been rectified, the boiler can be reset by pressing the
J button for 2 seconds.
3.3.7.

Air differential pressure switch

Before a start and when the boiler is in operation, the air pressure
differential switch PS measures the difference in pressure between
the measuring points at the rear of the heat exchanger p
-
box p . If the pressure difference is greater than 6 mbar, then the boiler
will lock out. Once the fault has been rectified, the boiler can be reset
by pressing the J button for 2 seconds.
3. Technical description
+
and the air
15