Hello,
Im running Mitsubishi Ecodan EHSD-YM9DZ, Zubadan Inverter PUD-SHWM120YAA for already one year and average CoP for period October 2023 - April 2024 was 3.30. I have Two Zones, one for radiator heating and second for underfloor heating. I played around with the types of Flow and for me i liked the best Constant Flow for both Zones. Zone2 Underfloor heating for rooms were controlled With Uponor Smatrix, but rooms with radiators were controlled with radiator thermostat. Also for cold days i were using Fireplace that is connected to heating system. Is CoP 3.30 is good enough, can i make it better? . Flow Temperatures for Zones were 40C-42C for Zone1 and 35C for Zone2.
Also i want to figure out do the pump speeds for my system is optimal?
Water Circulation pump from Fireplace to two zone kit. I dont see there any problems as the pump is automatically turned on/off if fireplace is used. Only maybe is it’s better to connect directly to Buffer tank? (Grundfos ALPHA 1L 25-60 130, and i’m running it with constant maximum speed , to take away heat from fireplace)
Water Circulation pump from Buffer tank to two zone kit, runs 24/7 ( Grundfos ALPHA 2L 25-60 180, running on PP2 mode)
Water Circulation pump for radiators in second floor. (Grundfos UPS0 25-65 130, running in max constant speed), Pump works 24/7 and i dont control it with Heatpump as i need it to be running when Fireplace is used. Before i switched from Gas boiler to Heatpump pump speed were set to middle speed, but in second floor i have towel dryer attached to the same zone, but it doesnt want to heat up, so i switched to max sped the pump and it is bit warmer, but with Gas boiler it were mush hotter.
In FTC6 Controller i can specify how works Motorised mixing valve. I have default settings there.
Water Circulation pump from Heatpump to Buffer tank i can set up from 1 to 5, how to know which is optimal?
Shoud the pumps 5, 2 and 3 be synced to get out maximum performance? I have attached drawing of my system.
For other readers, this is a 12 kW split unit on 3-phase power.
What’s CoP did the system achieve over the entire year? Does this provide hot water too?
3.3 is okay, but there’s room for improvement depending on your climate. Manufacturer’s data quotes nominal CoP of 3.3 at 2°C outdoors with 35°C flow temperature:
You may be limited by the design of the heating system. The inclusion of a buffer tank and 5 (!) pumps has made for a complicated system which won’t be able to get great performance.
This might be addressed by balancing the radiators rather than increasing the speed of the pump. There are plenty of guides on how to do that, though it’s not as easy to do as they make out.
It’s probably best if all the circuits are pumped with the same flow rate. One way to determine this is to measure the difference in temperature (dT) between the flow and return, and fiddle the pump speeds until they match. However, I suspect that there’s only a little performance benefit to be gained from this, mostly by reducing the power consumed by the pumps.
Here are some other topics that may be useful reading:
Heating season was from October till April, from April till this year October system were turned Off for heating. Yes, it provides hot water to, CoP for water for 12 months average 2,4. I did not draw it, but I have Combi buffer tank (buffer for heating and DHW) , and before it there is 3 way valve controlled by Heatpump.
Average Outdoor temperature for heating season were 2.4C. And than compare it with your provided table CoP 3.30 is what HeatPump is designed for.
Does anyone know is its possible for Mitsubishi Ecodan to leave Only One Zone Running, Like Zone2, but turn Off Zone1. I cant find the setting in FTC6 controller.
And is its possible to set different flow temperature at night, if constant Flow temperature is used? Like at night 3C set back, instead of 40C it would be 37C?
I believe to prohibit a single zone you can only do it via the schedule.
You can set in the schedule the target temperature to set back at certain times (limited quantity) but I don’t believe fixed flow.
However,
It sounds like you are looking for the ability to perform some advanced configuration and monitoring - you can do all the above and more with Home Assistant and a connector that plugs into the CN105 (instead of MELCloud)
