Section 4 – Installation
Fig. 4.7a Wiring configuration: PCB Termination
for all Natural Air 180 & 350 units.
(except 350 PH – see Fig. 4.7b)
Fig. 4.7b Wiring configuration: Termination
for Natural Air 350 PH units only.
(Note : Pre-heater and Boost Heater outputs
are only available on the Natural Air PH
models)
4.5.3 Electronics boards in the ventilation unit
The ventilation unit is equipped with several boards.
The mains voltage supply is connected to the EMC Terminal Block PCB on the Natural Air 180 units.
The mains voltage supply is connected to the Installer Terminal Box on the top of the Natural Air 350 units.
An external Smoke alarm and Flue detection controls can be connected to the Main Connector PCB.
An optional External Sensors PCB is required on the Natural Air models, if external sensors are used.
(Spare part, 42273SK – See User Manual).
(Note : The External Sensor PCB is fitted as standard to the Natural Air Plus and Natural Air PH Models)
To make connection easier, the boards can be removed from the housing.
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