Connecting Circulation Pumps

Please note:

Do not attempt to combine different brands of variable speed circulation pumps when connecting to this heat pump. These pumps can have different protocol that may be incompatible from brand to brand. However, using one brand of RS-485 equipped variable speed circulation pump with a different brand single speed circulation pump is supported. A single speed circulation pump will require an expansion board as it uses a relay.

Also Note:

While the AquaCal® heat pump has the capability of controlling multiple circulation pumps, this depends on how many addresses the circulation pump can provide. Each circulation pump must have a distinct address.