... fans, equipped with single phase direct drive motors, low noise 6 poles, protection level IP54, provided with a protective outlet ... valve.HYDRONIC CIRCUITBuilt with air vent valve, water drain connection, water circuit safety valve, water pump (For smaller size ... pump protection breaker(5)Fan motor protection breaker;(6)Control circuit protection breaker;(7)Phase sequence relay (only for 3-phase ...