The Comfort Plus Hydronic heating system MUST be plumbed with a primary loop and secondary (zone) loops. At the end of a heat call, water must be able to flow through the exchanger and the primary loop to dissipate heat until the core blower comes to a complete stop. The primary loop is not generally insulated for this reason.
Primary Loop Specifications:
a minimum of 10' of 1" pipe rated for 250 degrees Fahrenheit.
a dedicated pump (circulator) powered by red and white pump wires.
continuous flow in normal operation. The primary loop requires its own pump (circulator).
Exception: In applications where there is a single heating loop and the primary loop pump can continue to circulate water when there is no call for heat, the entire heating loop system may be considered the primary loop and no other pumps/loops are needed.
For more information on the primary loop, refer to the Steffes Primary Loop Kit or the Typical Primary Loop Diagram. The secondary (zone) loops require additional pump(s) to operate effectively. Refer to the Typical System Plumbing Diagrams (Single Temperature Zones or with Air Handler) for installation information.
Related Topics:
FREEZE PROTECTION: Risk of frozen pipes. Can cause property damage. Hydronic heating system freeze-ups WILL cause extensive damage to the entire heating system and/or property. It is the responsibility of the installer to provide protection against freezing. In addition to the expected causes of frozen pipes, blower failure in air-handler-equipped units can cause heat exchanger freezing in cooling mode.
PIPING SUPPORT: Risk of exchanger damage. Can cause property damage or personal injury. DO NOT use the exchanger as support for piping. Support brackets should be in place to ensure proper operation of the system and to keep pressure off the inlet and outlet piping.