Of course an air separator should be mounted where it will be most effective, in the boiler supply piping, on the low pressure side of a pump, and preferably at a high point in the system where the air will tend to be. The separator will remove whatever air passes through it, no matter where it is located in the system, so you can mount is as you describe but it may be less effective.
Of course an air separator should be mounted where it will be most effective, in the boiler supply piping, on the low pressure side of a pump, and preferably at a high point in the system where the air will tend to be. The separator will remove whatever air passes through it, no matter where it is located in the system, so you can mount is as you describe but it may be less effective.