BRULA NEO service instructions
Dated 03/18
Page
29 of
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This means that the relays switch as soon as their engagement conditions are
met, regardless of whether the fireplace is operating or not.
Note: The switching power of the relays is 5 Amps. This means that
consumers can only be switched directly by the NEO up to about 1100 W.
A contactor must be used for higher load levels.
The following functions can be selected from the relay menu:
Relay OFF:
The relay is deactivated and never switches.
Combustion:
While the control system is active, i.e. NOT in Standby mode,
this relay is active. This could enable you to block an appliance such as an
extractor fan while the fireplace is operating. Or switch on a smoke extractor.
Thermostat hot:
If the set temperature is exceeded, the relay engages then
disengages again once the set temperature drops below the hysteresis value.
Thermostat cold:
Below the set temperature, the relay is switched on. The
relay switches off again whenever the set temperature exceeds the hysteresis
value. It switches back on once the temperature drops below the set threshold
value.
Differential temperature:
This function compares 2 temperatures and only
switches on the relay if temperature A is above the "temperature threshold" AND
is higher than temperature B by at least as much as the "Hysteresis Delta T"
value. In addition, the relay is also always switched on whenever temperature
A is higher than the "Alarm threshold" value. The prime example of this relay
function is activation of the accumulator charge pump. This also prevents the
buffer being cooled down via the boiler.
After saving the "Differential temperature" function, another image appears on
screen with the setting values:
Number of the boiler sensor: Indicates which sensor is located in the boiler.
Number of buffer sensor: Indicates which sensor is in the buffer (at the top).
Temperature threshold: This indicates the switching threshold of the return riser.
Hysteresis: Associated with the return riser. Pump switches off whenever the
boiler temperature is lower than the temperature threshold minus
hysteresis. Engagement occurs once the threshold is exceeded.