3 Years

Operation/external diagnostics - when any thermostat calls for heat, the appropriate zone valve is energized and the yellow light goes on|When the zone valve is fully open, the red light goes on and energizes the end switch relay|The green light should always be on, indicating that power is connected|Priority operation - when zone 4 is switched to the priority setting and is actuated, all other zones will stop operation until zone 4 is satisfied|When a circulator is used on the priority zone instead of a zone valve, jumper 3 and 4 of the priority zone|Priority protection operation - when the priority zone calls continuously for more than one hour, power is returned to all the other zones, allowing each zone to function independently|Once the priority zone is satisfied, the control's auto-reset is activated and the priority zone is again allowed to have priority for up to one hour starting from when it calls next|External Indicator Lights|Switchable Priority|Simplified Wiring|Works with 2, 3, or 4-Wire Zone Valves|Compact Design|Fuse Protected|100% Factory Tested|Two Isolated End Switches|Extra Set of Dry Contacts|Contractor friendly PC Board Layout|Universal Thermostat Compatibility|Sturdy Screw Connections

CSA Approved|UL Listed