ᐅ CTA Aeroheat Heat Pump Settings for Optimization

Hi everyone,

I would also like to fine-tune the settings of my heat pump. Here are the current settings:

The hot water is set to 47°C (117°F) with circulation running 3 hours in the morning and 4 hours in the evening. Circulation pump is on for 5 minutes, off for 55 minutes.

Specific questions:
- We repeatedly get error 724 (defrost temperature difference >15K). The technician suggested increasing the secondary circuit flow, saying the energy in the heating circuit is currently not sufficient for defrosting. That sounds illogical to me. What else could be causing this error?
- The flow in the bathroom is relatively low, and naturally, there is also the least piping area installed there per square meter. How can I increase the flow in that area?

All actuators are fully open. The heating system is in the basement, and the problematic bathroom is on the top floor, on the last circuit at the manifold.

I would appreciate any tips.

Ivenh0

What heat pump model?
What flow rate in the underfloor heating?
What type of house?

- We repeatedly encounter error 724 (temperature difference defrost >15K).

This often indicates an overall insufficient flow rate.

Daniel-Sp schrieb:

What heat pump model?
What is the flow rate in the underfloor heating?
What kind of house?

The heat pump is a CTA LWA12 with HDT9.
The flow rate is just under 2,000 L/h (8.8 gallons per hour).
The house has a total of 309 m² (3,327 ft²), of which about 230 m² (2,476 ft²) is heated living area, another 25 m² (269 ft²) is unheated living space, and the rest is unheated utility space (outside the insulated building envelope but still directly integrated in the basement, including garage and workshop).

Basement:
Office – 227 m (132 + 95 m) (745 ft (433 + 312 ft)) – 21.3 m² (229 ft²) – 1.8 L/min, 1.9 L/min (0.5, 0.5 gallons per minute)
Hallway – 92 m (302 ft) – 11.6 m² (125 ft²) – 1.9 L/min (0.5 gpm)
Bathroom – 60 m (197 ft) – 4.8 m² (52 ft²) – 0.5 L/min (0.13 gpm) (not fully open)
Laundry – 120 m (70 + 50 m) (394 ft (230 + 164 ft)) – 9.5 m² (102 ft²) – 0.9 L/min, 1.0 L/min (0.24, 0.26 gpm) (not fully open)
Technical room – no underfloor heating – 9.9 m² (107 ft²)
Workshop – no underfloor heating – 10.8 m² (116 ft²)
Storage – no underfloor heating – 8.5 m² (91 ft²)

Ground floor:
Living – 205 m (103 + 102 m) (673 ft (338 + 335 ft)) – 21.5 m² (231 ft²) – 1.9 L/min, 1.8 L/min (0.5, 0.5 gpm)
Kitchen/Dining – 232 m (82 + 95 + 55 m) (761 ft (269 + 312 + 180 ft)) – 36.5 m² (393 ft²) – 2.0 L/min, 1.6 L/min, 2.3 L/min (0.53, 0.42, 0.61 gpm)
Guest/Office – 161 m (84 + 77 m) (528 ft (276 + 252 ft)) – 13.3 m² (143 ft²) – 2.0 L/min, 2.1 L/min (0.53, 0.55 gpm)
Hallway – 122 m (60 + 62 m) (400 ft (197 + 203 ft)) – 13.1 m² (141 ft²) – 2.0 L/min, 2.1 L/min (0.53, 0.55 gpm)
Bathroom – 62 m (203 ft) – 6.4 m³ (not specified if m² or m³; if a typo, assume m²) – 2.0 L/min (0.53 gpm)
Pantry – no underfloor heating – 3.3 m² (36 ft²)

Upper floor:
Child's room North – 187 m (102 + 85 m) (614 ft (335 + 279 ft)) – 16.8 m² (181 ft²) – 1.2 L/min, 0.7 L/min (not fully open) (0.32, 0.18 gpm)
Hallway – 41 m (135 ft) – 7.9 m² (85 ft²) – 1.0 L/min (not fully open) (0.26 gpm)
Child's room South – 197 m (90 + 107 m) (646 ft (295 + 351 ft)) – 18.8 m² (202 ft²) – 1.0 L/min, 1.1 L/min (0.26, 0.29 gpm)
Dressing room – 135 m (65 + 70 m) (443 ft (213 + 230 ft)) – 13.5 m² (145 ft²) – 0.2 L/min, 0.7 L/min (both not fully open) (0.05, 0.18 gpm)
Bedroom – 164 m (75 + 89 m) (538 ft (246 + 292 ft)) – 14.7 m² (158 ft²) – 0.6 L/min, 1.0 L/min (0.16, 0.26 gpm)
Bathroom – 111 m (45 + 66 m) (364 ft (148 + 216 ft)) – 14.6 m² (157 ft²) – 0.8 L/min, 0.6 L/min (0.21, 0.16 gpm)

I can’t find it on the homepage...

Daniel-Sp schrieb:

I cannot find it on the homepage...

CTA AH CI 12a