Panasonic U-10MF1E8 Service Manual page 14

3. Compressor Control
Compressor Control Table
1
Evaporation temperature (Te) and condensation temperature (Tc) areas A, B, C, and D are the same as for
evaporation temperature control and condensation temperature control.
(2) Increasing/decreasing the heat exchanger capacity (when the outdoor unit heat exchanger is functioning as a
condenser)
• 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 increased, increasing the system condensation capacity and lowering
the condensation temperature (Tc). The amount of heat discharge at the outdoor unit heat exchanger
increases, increasing the heat intake at the Cooling mode indoor units and lowering the evaporation
temperature (Te).
• 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 decreased, decreasing the system condensation capacity and
raising the condensation temperature (Tc). The amount of heat discharge at the outdoor unit heat exchanger
decreases, decreasing the heat intake at the Cooling mode indoor units and raising the evaporation
temperature (Te).
Outdoor Unit Heat Exchanger Control Table (when the outdoor unit heat exchanger is functioning as a
condenser)
Low
A
A UP
B slow_UP
C not_UP
Low
A
STAY
A
B
DOWN
C
Condensation Temp. [Tc]
B
Target
Condensation Temp. [Tc]
B
Target
STAY
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3-WAY SYSTEM
Control Functions
High
C D
not_UP
STOP
DOWN
High
C
UP
STAY
STAY
STAY
D