The SALUS Wired Pump Relay Controllers allow wired thermostats
to control pumps and boilers for hydronic systems while supporting the following functions and features: Primary pump control Priority zone support (domestic hot water) Purge -Priority pump continues to run for 2 minutes afterend of priority call Exercise - pumps turn ON for 30 sec. after 72 hoursof inactivity Thermostat grouping ZC/ZR boiler enable support XX and AUX normally open contacts support Master / Slave function for up to 5 units (1 master / 4 slaves) LED indicators for zones and other status 3 models: AKL01P -single zone, AKL04P - 4 zone, AKL06P - 6 zone