I currently have an SQ1152 main pump motor and an additional booster pump for Polaris 280 vacuum. They are programmed though the mechanical Intermatic T10404R dual dial timer.
I am thinking to replace the SQ1152 with the Hayward SP3400VSP variable speed pump that has it's own timer on top of the motor.
I run booster pump for about an hour within the working interval of the main pump.
As far as I understand Hayward SP3400VSP does not have any axillary outputs to control the booster pump directly or via relay. So what is the best way to do that? I could leave the booster pump on the Intermatic timer, but I think it is not a good idea unless I will use some additional protecting relay to make sure booster pump won't turn on when the Hayward SP3400VSP is not running at high speed.
Any ideas? Maybe there is some elegant way to have variable speed pump to co-exist with a boosted pump ?