High/ Low Control (2 X No Volt Switched Pairs); Other Inputs; Shut Down Input; Lock-Out Input - REMEHA Gas 310 ECO Technical Information

8.6.5 High/ low control (2 x no volt switched pairs)

The heat output is controlled between part load (50%,
adjustable) and full load, by means of a two-stage con-
troller, terminal connections X29-9 and X29-10 low fire;
X29-7 and X29-8 high fire.
Set the x value of the boiler control operation param-
eter A to 2. The output percentage on which the boiler
runs on low fire, can be adjusted with parameter 4
(low fire start point as percentage) in the setting mode.
The 'high fire' percentage is dependent of the maximal
adjusted output, see setting mode, parameter 6 (maxi-
mum output). During this 'high' state modulation on
adjusted flow temperature is released.

8.7 Other inputs

8.7.1 Shut down input

As standard the boiler is supplied with a shut down
interlock carrying a 24 Volt AC boiler control circuit. This
input does not require manual re-set.
Any external devices required to stop the boiler (e.g.
limit switches of throttling valves, minimum gas pressure
switches) should be wired in series and connected to
terminals X29-5 and X29-6, breaking the circuit will acti-
vate the safety interlock and put the boiler into a shut-off
condition with code b **. If this input is being used,
the wire bridge must first be removed.

8.7.2 Lock-out input

As standard the boiler is supplied with a lock out inter-
lock carrying a 24 Volt AC boiler control circuit. This
input requires manual re-set if activated.
Any external devices required to stop the boiler (e.g.
maximum gas pressure switch) must be volt free and
should be wired in series and connected to terminals
X29-1 and X29-2. Breaking the circuit will activate the
safety interlock and put the boiler into a lock out condi-
tion, failure code 12 requiring manual intervention to
re-set it. If this input is being used, the wire bridge must
first be removed.

8.7.3 External interlock

As standard the boiler is supplied with an external inter-
lock carrying a 24 Volt AC boiler control circuit.
Any external devices required to prevent the boiler from
operating (e.g. boiler room ventilation air flow switch, or
butterfly valve end switch) must be volt free and should
be wired in series and connected to terminals X29-3 and
X29-4, breaking the circuit will prevent the boiler from
starting. Boiler does not go to lockout.
If this interlock is being used, the wire bridge must first
be removed.

8.7.4 Other outputs

8.7.5 Analog output

Depending on the option settings in the service level
(see section 13.2.13), the analog output signal is able to
transmit the following values:
62560.indd 27 62560.indd 27
Output
Description
signal
0 volts Boiler off
0.5 volts Alarm signal/lock-out
1.0 volts Shut-off
2.0 - 10 volts Output between 20 and 100% or
flow temperature of 20 to 100 °
table 10 Analog output signal
This output relates to terminals X29-13 (+) and X29-14
(-).

8.7.6 Operation signal

As standard the boiler is supplied with internal relays to
indicate boiler run and boiler on high fire.
The relay contacts are volt free and close to confirm
operation.
For the "boiler Low fire" signal connect to terminals X27-
6 and X27-7.
For the "boiler High fire" signal' connect to terminals
X27-4 and X27-5.
Contact load:
- Maximum voltage: 230 V.
- Maximum current: 1 A.
For ON/OFF signal: set parameter c to 6000 rpm.

8.7.7 Common alarm (lock-out)

As standard the boiler is supplied with an internal
change over relay to indicate common alarm.
The relay contacts are volt free and can be connected to
confirm operation with closed or open contacts.
For the alarm signal indication "closed contacts" connect
to terminals X27-3 and X27-1.
For the alarm signal indication "open contacts" connect
to terminals X27-3 and X27-2.
Contact load:
- Maximum voltage: 230 volts.
- Maximum current:

8.7.8 External gas valve control

As standard the boiler is supplied with an internal
relay that is energised when there is a heat demand,
this applies a 230V supply to terminals X27-15 (live)
and X27-14 (neutral). The relay is de-energised when
the gas valve multiblock closes at the end of the heat
demand. Additional external interlocks (by others) may
be required in a multi boiler installation.
Important!!
g
This supply cannot be used to con-
trol an external gas valve if it supplies other appliances.
Contact load:
- External gas valve voltage:
- Maximum current:
27
1 Amp.
230 Volts.
1 Amp.
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