Panasonic U-8MF2E8 Service Manual page 18

3. Compressor Control
(3) Increasing/decreasing the heat exchanger capacity (when the outdoor unit heat exchanger is functioning as an
evaporator)
• Primarily when both the evaporation temperature (Te) and condensation temperature (Tc) are low
This occurs when the cooling capacity (heat intake) is high and the heating capacity (heat discharge) is low.
The outdoor heat exchanger capacity is increased, increasing the system evaporation capacity and raising
the evaporation temperature (Te). The amount of heat intake at the outdoor unit heat exchanger is increased,
increasing the heat discharge at the heating mode indoor units and raising the condensation temperature (Tc).
1
• Primarily when both the evaporation temperature (Te) and condensation temperature (Tc) are high
This occurs when the cooling capacity (heat intake) is low and the heating capacity (heat discharge) is high.
The outdoor heat exchanger capacity is decreased, decreasing the system evaporation capacity and lowering
the evaporation temperature (Te). The amount of heat intake at the outdoor unit heat exchanger is decreased,
decreasing the heat discharge at the heating mode indoor units and lowering the condensation temperature
(Tc).
Outdoor Heat Exchanger Control Table (when the outdoor heat exchanger is functioning as an evaporator)
6°C
B
2°C
-6°C
-8°C
-9°C
Low Condensation Temp. [Tc]
B
Target
1 - 10
3WAY SYSTEM
Control Functions
→ High
D