Notice: Disregard the arrow direction on the valve body.
Heat Pump Operation (Default)
Port AB opens to Port A. Fluid flows through the tee to the water in fitting feeding the unit heat exchanger.
Waterside economizer operation (24V applied to the actuator open @ the black and white actuator leads)
Port AB opens to port B. Fluid flows through waterside economizer coil and then to the water in fitting feeding the unit heat exchanger.
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.