Section 4 – Installation
4.5.3 Electronics boards in the ventilation unit
The ventilation unit is equipped with several boards. The voltage supply is connected to the mains terminal
block located behind the front cover. An external Smoke alarm and Flue detection controls can be connected
to the Main Connector PCB.
An optional External Sensors PCB is required (42273SK – See User Manual) if external sensors are used.
To make connection easier, the boards can be removed from the housing.
Fig. 4.8 Main Connector PCB
External Sensors PCB
L2
Connection to 4 internal temperature
sensors
X1 block 1
to 7
External 0 – 10V output Humidistat sensors.
(Model 180V - Only 1, 2 and 3 available)
L3
External Volt free smoke detector input
X1 block
CO2 sensor
External 0 – 10V output CO2 sensor
L6
Connection point to internal humidity
sensor
X2 block
AQS 1
External 0 – 10V output AQS 1 sensor
L7
Connection point to External sensors
PCB
X2 block
Smoke
External Volt free smoke detector input *
L16 Connection point to Main Logic PCB
X2 block
Volt free 1
External Volt free configurable input 1
L17 External Flue Detection 1 : Volt free
input
X2 block
Volt free 2
External Volt free configurable input 2
L17 External Flue Detection 2 : Volt free
input
X2 block
Sensor 2
Internal 0 – 10V output AQS 2 sensor.
(When fitted)
* Note : Do not use this input for Smoke Detection if a smoke detector device is already connected to L3 on
the Main Connector PCB.
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Section 6 – Control / Service menu
•
Use the “Set the Air flow” menu to change Speed 1 and 2 and 3 for the Supply and the Extract fans.
The settings are all in m³/hr. (10 m³/hr = 2.8 l/s). The fans are constant volume, so the set flow rate values will
be maintained for all normal configurations of duct work and grilles.
6.3.2 Use the “Change settings” menu to alter various settings :
Fig. 6.8 Installer menu: Change settings
Set Internal and External Humidistats:
•
The Ramp trigger % sets how rapidly the humidity needs to change before it triggers the fan speed from 1
to 2.
E.g. 3% means the humidity must increase by more than 3% in 5 minutes in order to trigger. Therefore, the
higher the %, the less sensitive the humidistat.
Set External CO2 and AQS sensors:
•
Adjust the air quality ppm level to set the point when the speed changes from 1 to 2.
The higher the ppm
level the poorer the air quality before the speed increases.
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