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De Dietrich Gas 310/610 ECO
8.2.4 Fuse ratings
Fuses on the circuit board on the control
unit:
F1 2 AF mains voltage fuse (automatic
fuse)
F2 2 AT for gas valve multiblock
F3 2 AT for 24 V circuit
F10 2 AT for shunt pump
F11 1 AT for flue gas damper
F12 1 AT for butterfly valve
F13 2 AT for heating pump
F14 1 AT for external gas valve
The boiler fuse F
a
is located behind / next to the 120V terminal strip.
This fuse de-energizes the whole boiler and has a rating of 10 AT.
The fan has a Power Factor Control (PFC ensures the main power
supply is distributed more uniformly) and is fused with a 12 AT fuse
F
b
(behind / next to the 120 V terminal strip).
8.2.5 Temperature control
The De Dietrich Gas 310/610 ECO is equipped with an electronic temperature limit control based on flow, return,
and boiler bl ock and f lue gas t emperature s ensors. T he f low t emperature i s a djustable bet ween 68-194°F [20-
90°C].
8.2.6 Low water level protection (flow and content)
The Gas 310/610 ECO is equipped with low water protection based on temperature differences (
T
) between flow
and return. When the
T
= 45°F [25
°
C] (factory setting) the boiler starts modulating down so that it remains
operational as long as possible. When the
T
= 72
°
F [40
°
C] the boiler will be at part load.
If the
T
continues to rise and reaches 81°F [45
°
C], the boiler shuts down (note a boiler failure, see section 12.4)
and will restart when conditions return to normal. If the boiler is fired dry, it will go to high temperature lock out,
failure code .
8.2.7 High limit protection
The high limit temperature protection device switches off and locks out the boiler (showing a flashing fault code,
see section 14.4 for details) when the flow temperature exceeds the high limit set point (adjustable parameter, see
section 13.2 .10). When the fault is corrected, the boiler can be restarted by using the reset-key on the control
panel.
8.2.8 Air pressure differential sensor (LDS)
At the start of the heat demand, the system checks whether the LDS input is open.
If not, there are (max.) 4 restarts, before the boiler is locked out ().If the LDS input is open, the fan will speed
up and a pressure difference is built up across the boiler. When the LDS control speed is reached the LDS input
must close.
If not, there are (max.) 4 restarts before t
he boiler is locked out (). Once started the LDS function is switched
off for modulation purposes.
Fig. 15 Fuse plan
Fig. 16 – Position fuses (F
a
& F
b
)
30


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