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Question about Heating Pump Operation mode – Ecodan FTC6 v20.06

 
Air Source Heat Pumps (ASHPs)
Last Post by Johj45 3 hours ago
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 Johj45
(@johj45)
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Joined: 3 hours ago
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Topic starter 18/10/2025 9:08 pm  

I have a Mitsubishi Ecodan EHST20D-YM9D with PUHZ-SWM80 outdoor unit, FTC6 controller (firmware 20.06), and an external 100 L buffer tank. The system is controlled via room temperature sensor.

I would like the internal heating circulation pump to stop immediately when the compressor stops, instead of running during heating demand but compressor is off and stop only when heat pump is in standby because indoor temp is reached.

Is there any installer parameter or menu setting in FTC6 (v20.06) that allows this — for example:

Water Pump Operation
   - Continuous
   - During Heating Demand
   - With Compressor only
 

or perhaps a “Delay Time before pump switched off” that can be set to zero?

the reason why i want this is that the internal circulation pump is causing distortion in the buffertank if it runs when the compressor does not heat the water.



   
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