Temperature Control; Low Water Level Protection (Flow And Content); High Limit Protection; Air Pressure Differential Sensor (Lds) - REMEHA Gas 310 ECO Technical Information

fig. 16 Position Fuses F

8.2.5 Temperature control

The Remeha Gas 310 ECO is equipped with electronic
temperature control based on flow, return, boiler block
and flue gas temperature sensors. The flow temperature
is adjustable between 20 and 90° (factory setting 90°).

8.2.6 Low water level protection (flow and content)

The Remeha Gas 310 ECO is equipped with low water
protection based on temperature differences (dT)
between flow and return. When the dT = 25° (fac-
tory setting) the boiler starts modulating down so that it
remains operational as long as possible. When the dT
= 40° the boiler will be at part load. If the dT continues
to rise and reaches 45°, the boiler shuts down (not 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 (&.
fig. 17 Terminal strip
04.31H.79.00001
62560.indd 23 62560.indd 23
and F
a b

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 a heat demand the system checks
whether the LDS input is open. If not, there are (max.) 4
restarts, before the boiler is locked out (E61).
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 the boil-
er is locked out (E08).
Once started the LDS function is switched off for modu-
lation purposes.

8.3 Connections

The terminal strips and boiler connectors can be seen
once the control box cover is removed. The left-hand
terminal strip (X29) is used for 24-volt connections. The
right-hand terminal strip (X27) is used for 230-volt con-
nections. All external connections (low and high voltage)
are made on these terminal strips (see fig. 17). The
various connection options are detailed in the following
sections.
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