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g
Important!!!
This function is only operational
when a system pressure sensor is connected and acti-
vated (parameter J).
8.8.2 Gas valve leak proving system (VPS)
The gas valve leak proving system checks and oper-
ates the safety valves on the gas valve multiblock. The
test takes place before the boiler module pre-ventilation
phase. In the event of a leak between the two safety
valves in the gas valve multiblock, the boiler module will
lock out and show failure code 89 or 90 on the dis-
play. The gas valve leak proving system must be fitted
to the boiler module and connected to the 3-pin female
plug X21 on the 24 volt terminal strip and the control set
to recognise it using parameter J in setting mode (see
section 13.2.13).
g
Important!!!
This function is only operational
when a gas valve leak proving system is connected and
activated (parameter J).
8.8.3 Minimum gas pressure switch
The minimum gas pressure switch (set to 17 mbar)
shuts down the boiler module (shut-off code b @^) if
the inlet gas pressure becomes too low. The minimum
gas pressure switch must be connected to the 3-pin
female plug X21 on the 24-volt terminal strip. The con-
nection is automatically detected by the boiler control.
8.8.4 Return butterfly valve (not Broag supply)
A butterfly valve can be installed in the return for each
boiler module to ensure that a non-operating boiler
module is hydraulically disconnected from the system.
When the return butterfly valve is fully open, the valve
end switch contact is closed, allowing the boiler module
to run. The return butterfly valve must be connected to
terminals X27-11 (neutral), X27-12 (power close) and
X27-13 (power open) on the 230-volt terminal strip.
The end switch on the return butterfly valve must be
connected to the external interlock terminals X29-3 and
X29-4 (first remove bridge). After boiler module shut-off,
the power supply will remain on X27-13 keeping the
valve open during the post-circulation time of the pump
(set point code 2), then switch to X27-12 to close the
valve (this remains valid even if no pump has been con-
nected to the control box).
Also see section 8.9.1 and section 13.1.2
8.9 Other connections
8.9.1 Boiler pump control
Each module of the Remeha Gas 610 ECO has a facility
to provide a power supply (230V Max 2 amps) to run or
control an external boiler pump.
The boiler control will run the pump once every 24 hours
when the boiler module not enabled to prevent stick-
ing and will also provide a run on period at the end of a
heat demand (parameter @, see section 13.1.2).
g
Important!!
g
Important!!
the system pump cannot use this power supply. If the
boiler module shuts down the system pump will also
shut down.
Contact load terminals X27-9 (neutral) and X27-10 (live):
Voltage
Maximum current
The hydraulic resistance of the boiler module at a dT
of 11° and 20° for the various output variants of the
Remeha Gas 610 ECO can be found in table 02, sec-
tion 4.2
8.9.2 Frost protection
The boiler must be installed in a frost-free area to pre-
vent freezing of the condensate drain.
If the temperature of the heating water drops too low the
integrated boiler protection activates under the following
conditions.
If the boiler flow temperature:
- is below 7°, the external heating pump connected to
the boiler module is switched on by the control unit;
- is below 3°, the boiler module is switched on at mini-
mum capacity;
- exceeds 10°, the boiler module and heating pump
are switched off again. The pump now has a fixed
post-circulation time of 15 minutes.
g
Important!!
protects the boiler module. Other measures must be
employed to protect the building and system and will
depend which parameters are set or what form of exter-
nal controls are in use.
29
phase/ neutral sensitive!
For multiple boiler installations
: 230 volts
: 2 A.
This frost protection only
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