Certain boilers require a minimum feed through flow. The burner is therefore linked to a flow-switch.
Question
If, in the system below, the 3WV’s n°5 & n°8 close, what is the flow in the boiler?
If the 3WV’s close, flow stops in the boiler.
It is necessary to check that the manufacturer does not insist on a minimum feed flow.
Question
Respecting the numbering in the diagram below, explain the regulating operating principle corresponding to the heating system below:
System description:
– 2 heating circuits east & west.
– The controller ensures the regulating of the east circuit subject to exterior temperature measured on sensor n°6; it controls the circuit outlet temperature on the sensor n°4 by action on the 3WV n°2.
– The controller ensures the regulating of the west circuit subject to exterior temperature measured on sensor n°7; it controls the circuit outlet temperature on the sensor n°5 by action on the 3WV n°3.
– By action on the burner, the controller also regulates boiler production temperature on sensor n°1 subject to the requirements generated by the control of the 2 outlet temperatures.