Panasonic WU-144MF1U9E 3-Way Service Manual - Page 16

WAY VRF SYSTEM, Control Functions, Compressor Control Table

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Low Evaporation Temp. [Te] High 3. Compressor Control Compressor Control Table Low Condensation Temp. [Tc] A B C A UP not_UP 1 B slow_UP Target C not_UP DOWN 3-WAY VRF SYSTEM Control Functions High D STOP 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 Condensation Temp. [Tc] A B C High D STAY A UP Compressor stop B Target STAY C DOWN STAY STAY STAY Low Evaporation Temp. [Te] High 1 - 8

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3. Compressor Control
3-WAY VRF SYSTEM
Control Functions
Compressor Control Table
A
High
A
UP
B
C
Low
Condensation Temp. [Tc]
High
not_UP
DOWN
not_UP
slow_UP
Target
STOP
Low
Evaporation Temp. [Te]
B
C
D
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)
UP
DOWN
STAY
STAY
STAY
STAY
STAY
Compressor stop
A
B
C
Target
Low
Condensation Temp. [Tc]
High
A
B
C
D
High
Low
Evaporation Temp. [Te]