See unit diagrams in the product IOM for more detail on CC1, CC2, and TNS2 connection details.
IVR (Isolation Valve Relay) and ISO VLV (Isolation Valve) are field wired and supplied.
It's recommended that the isolation valve has a drive time of 15 seconds or less to full open.
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.