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15. 02. 22. Document Number 672040
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
BPS H-CO
Installation Manual
1.21.2 Maintenance Alarm (Non-Latching)
Once in maintenance alarm state the only action taken is de-energising
of the fault relay. Once the trigger is removed, the alarm will reset
automatically.
Causes of maintenance alarm:
•Sensor Failure.
•Low supply temperature, default 8°C. This can be set to stop fans
if required.
•Frost protection routine active, default 4°C (This only runs if water
valves are selected as fitted.
•Excessively high supply temperature reading (This will stop
heating).
•Supply Filter dP fault IN9 (if fitted).
•Extract Filter dP fault IN10 (if fitted).
•Condensate Pump - Alarm IN4 (if fitted).
•IO Damper Alarm - Alarm IN3 (if fitted).
•Thermal Wheel Alarm - Alarm IN11 (if fitted).
All alarms have a hold off period set by the setpoint “Alarm delay”.
1.21.3 Thermal Trip
In case of software failure, as a final resort, the electric heater is
protected by a fail-safe thermal overload switch. This switch disables
the heater controller via a contactor once the temperature reaches
80°C. When this occurs, the critical alarm will latch in software and the
supply contactor will latch in the off position.
Once the unit cools, the contactor will remain latched off until
power cycle.
1.22 Configurable Analogue Output 4 (OUT4)
Relay 8 is a configurable relay output which can be set to the following
functions. It can be set by the multi-state object “RL8 Mode”.
•Cooling Demand (Default Setting)
This option will run the Relay as a cooling command relay. This
output will only function if a cooling type is selected.
•Window Actuator
This option will run a Window Indication routine with a dual CO2
setpoint strategy. Relay 8 will be used to indicate to the end user
whether it is appropriate to open the windows or not. This relay
can be wired to an end user’s signal lamp or other signal. This relay
is SPST so an additional relay is required if a light is required for
each state. A multistate object, ‘Window Mode Status’, exists with
two states, ‘Open’ and ‘Close’.
At external temperatures less than the ‘Window Open Threshold’
(14°C default) the indicator will signal close windows. The ‘CO2 Winter
Target’ will be used as the setpoint (1000ppm default).
At external temperatures greater than the ‘Window Open Threshold’
(14°C default) and CO2 level higher than the ‘CO2 Winter Target’, the
indicator will signal open windows. The ‘CO2 Summer Target’ will be
used as the setpoint (1500ppm default).
If the HX bypass damper is driven to bypass while fans are enabled,
the indicator will signal open windows (HX Bypass due to Condensate
pump failure will not affect windows status).
The ‘Window Mode Status’ will indicate close windows when the unit is
not enabled and at all other times.
1.23 Configurable Analogue Output 4 (OUT4)
OUT4 is a configurable analogue output which can be set to the
following functions via the multi-state object “OUT4 Mode”.
•Cooling Demand (Default Setting)
This will provide a standard 0-10V cooling output. This output will
only function if a cooling type is selected.
•ES Classic BMS
This option will provide a 0-10v ESClassic BMS output based on
ventilation demand. This can then be used in conjunction with
the fan run relay to run multiple slave Classic units from a master
Connect control.
The type of BMS output can be selected by the muti-state object ‘ECS
BMS Thermic Output’.
Auto - The BMS output will switch between heating and cooling
depending on outdoor air temperature.
None - The unit will only supply ‘Vent Only’ voltages.
Heating - The unit will only supply ‘Heating’ voltages.
Cooling - The unit will only supply ‘Cooling’ voltages.
1.23.1 ES Classic BMS Output Table
Function Ventilation Only Cooling Heating
Off / Trickle 0.25V - -
Speed 1 0.5V 0.75V 1V
Speed 2 1.5V 1.75V 2V
Speed 3 2.5V 2.75V 3V
Speed 4 3.5V 3.75V 4V
Speed 5 4.5V 4.75V 5V
Speed 6 5.5V 5.75V 6V
Speed 7 6.5V 6.75V 7V
Speed 8 7.5V 7.75V 8V
Speed 9 8.5V 8.75V 9V
Speed 10 9.5V 9.75V 10V
1.24 Fire Alarm
Once the Fire Alarm object is switched to the Alarm State, all fans,
heating and cooling elements will stop instantly. The fault relay
will de-energise and a fault message will be sent to the ESCO-LCD.
Once the fire alarm status is released, the units will continue running
automatically.
1.25 BACnet Overview
BACnet is a data communication protocol for Building Automation and
Control Networks. It allows compatibility between devices of different
manufacturers. In BACnet, any device on the network can browse the
network and discover devices.
1.26 Writing Values
It is best practice to only write to AV, BV & MSV (Analogue Variables,
Binary Variables, and Multistate Variables). When writing to these, it is
best to write at priority level 16.
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