ᐅ How to Properly Adjust an Air-to-Water Heat Pump with Underfloor Heating
Created on: 15 Dec 2019 16:52
M
M4rvin
Hello,
I have been searching around and reading the manual for my Elco air-to-water heat pump, but I haven’t fully figured it out yet...
I have a manifold on the ground floor and first floor; the recommendation is to fully open everything, set all thermostats to maximum, and then adjust the heating curve on the heat pump low enough to roughly achieve the desired temperature.
Is that more or less correct?
At the moment, every thermostat (except bathroom/bedroom) is set to 20°C (68°F), and the temperature in each room is about 20.9°C (70°F) (bathroom slightly warmer, bedroom slightly cooler).
However, I’m surprised by the high electricity consumption — it has been 800 kWh in just 2 months.
135 m² (1455 sq ft) living area
Elco Split 7 kW
Circulation pump not yet connected
Thanks in advance
M4rvin
I have been searching around and reading the manual for my Elco air-to-water heat pump, but I haven’t fully figured it out yet...
I have a manifold on the ground floor and first floor; the recommendation is to fully open everything, set all thermostats to maximum, and then adjust the heating curve on the heat pump low enough to roughly achieve the desired temperature.
Is that more or less correct?
At the moment, every thermostat (except bathroom/bedroom) is set to 20°C (68°F), and the temperature in each room is about 20.9°C (70°F) (bathroom slightly warmer, bedroom slightly cooler).
However, I’m surprised by the high electricity consumption — it has been 800 kWh in just 2 months.
135 m² (1455 sq ft) living area
Elco Split 7 kW
Circulation pump not yet connected
Thanks in advance
M4rvin
D
Daniel-Sp20 Dec 2019 22:30I’m not familiar with it, but I assume the display indicates the pressure difference at which it opens, so you need to set a higher pressure.
So, the technician was here today!
What was done?
- Parallel shift +2 degrees (bathroom too cold)
- Pump adjusted from 60% to 80% (flow rate too low)
- Temperature difference reduced from 7 to 5 (no idea)
- Timer switch installed for the circulation pump
- Hot water temperature lowered from 50°C (122°F) to 48°C (118°F)
I’m still waiting for the heat pump to switch on so I can check the flow rate.
My black box is a pressure relief valve. When the ERR is disconnected, it can be set to 500 mBar (7.25 psi). If not, it should be set to 250–300 mBar (3.6–4.35 psi), something to do with defrosting the outdoor unit.
In my opinion, a proper hydraulic balancing wasn’t done; it was only manually checked whether the return flow is cooler than the supply flow.
Let’s see how the temperature develops in the bathroom. Otherwise, I might install an electric heating element in the towel radiator.
What was done?
- Parallel shift +2 degrees (bathroom too cold)
- Pump adjusted from 60% to 80% (flow rate too low)
- Temperature difference reduced from 7 to 5 (no idea)
- Timer switch installed for the circulation pump
- Hot water temperature lowered from 50°C (122°F) to 48°C (118°F)
I’m still waiting for the heat pump to switch on so I can check the flow rate.
My black box is a pressure relief valve. When the ERR is disconnected, it can be set to 500 mBar (7.25 psi). If not, it should be set to 250–300 mBar (3.6–4.35 psi), something to do with defrosting the outdoor unit.
In my opinion, a proper hydraulic balancing wasn’t done; it was only manually checked whether the return flow is cooler than the supply flow.
Let’s see how the temperature develops in the bathroom. Otherwise, I might install an electric heating element in the towel radiator.
D
Daniel-Sp14 Jan 2020 13:34About the bypass valve and defrosting.
During defrosting, the heating circuit is reversed. This way, the heat stored in the screed is used to melt the ice. Additionally, a minimum flow rate is required. To ensure this, a bypass valve is installed, which opens when too many heating circuits are closed. If all heating circuits remain open (deactivated ERR), you can set it to the maximum. It cannot be fully closed; it will simply open only at a higher pressure difference between the supply and return lines. With a well-designed heat sink (i.e., underfloor heating), this effectively means the valve is closed. There is no thermal short circuit during heating and defrosting.
During defrosting, the heating circuit is reversed. This way, the heat stored in the screed is used to melt the ice. Additionally, a minimum flow rate is required. To ensure this, a bypass valve is installed, which opens when too many heating circuits are closed. If all heating circuits remain open (deactivated ERR), you can set it to the maximum. It cannot be fully closed; it will simply open only at a higher pressure difference between the supply and return lines. With a well-designed heat sink (i.e., underfloor heating), this effectively means the valve is closed. There is no thermal short circuit during heating and defrosting.
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