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Thanks Archmage, I tried both of your suggestions,

  1. there is only one baseboard on the pump loop. When i keep the pump flow rate fixed, It caps the flow rate on baseboard to that value but it still fluctuates between 0 and that value. Even if i try to keep the thermostat value pretty high (like 50 c), that results in severe errors with crazy high temperature points.

  2. I put a loadprofile:plant after the baseboard with zero load but controlling that object flow rate can not overwrite the base board flow rate.

Do you think if i change from a zone equipment like baseboard to a heating coil which is controlled by a setpoint manager connected to the thermal zone, Would there be any chance that i can control its mass flow rate?

Thanks Archmage, I tried both of your suggestions,

  1. there is only one baseboard on the pump loop. When i keep the pump flow rate fixed, It caps the flow rate on baseboard to that value The first suggestion works but it still fluctuates between 0 and that value. Even if i try is required to keep the thermostat value pretty high (like 50 c), that results in severe errors with crazy to a high temperature points.and remove the bypass pipe.

  2. I put a loadprofile:plant after the baseboard with zero load but controlling that object flow rate can not overwrite the base board flow rate.

Do you think if i change from a zone equipment like baseboard to a heating coil which is controlled by a setpoint manager connected to the thermal zone, Would there be any chance that i can control its mass flow rate?