Belimo CQKB24-S-LL Actuator 320819-301 This rating indicates the specific

This rating indicates the specific temperature setpoints: the switch opens (breaks the circuit) at 105°F and closes (completes the circuit) at 120°F to manage fan operation and system safety

Precise Set Points: Factory-set

While it may cross-reference with some older McQuay models

Combustion Accuracy: Facilitates exact manifold pressure adjustments for peak heater efficiency

it integrates seamlessly into existing low-pressure boiler manifolds

Belimo CQKB24-S-LL Actuator 320819-301 This rating indicates the specificThe Belimo CQKB24 S LL is a specialized zone valve actuator designed for 2 way and 3 way ZoneTight valves. Operating on a 24VAC DC power supply, this Electronic Fail Safe (EFS) unit provides reliable Normally Open (NO) or Fail Open (FO) functionality via a supercapacitor power bank. This technical design ensures the valve returns to its emergency position during power loss, providing critical protection in hydronic systems. The unit delivers 22 in lb