Panasonic WU-216MF2U9 - Service Manual - Page 18

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 B slow_UP Target 1 C not_UP DOWN 3WAY VRF SYSTEM Control Functions High D STOP 2 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 3 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 is increased, 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 4 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 is decreased, decreasing the heat intake at the cooling mode indoor units and raising the evaporation temperature (Te). 5 Outdoor Unit Heat Exchanger Control Table (when the outdoor unit heat exchanger is functioning as a condenser) Low ← Condensation Temp. [Tc] → High A B C D 6 136.4°F (58°C) Compressor stop Low←Evaporation Temp. [ Te ]→High 110.3°F (43.5°C) 114.8°F (46°C) 118.4°F (48°C) 123.8°F (51°C) 7 A STAY UP B 42.8°F (6°C) 37.4°F (3°C) 32°F (0°C) 8 C 26.6°F (-3°C) Target DOWN 9 1 - 10

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3WAY VRF SYSTEM
Control Functions
1
- 10
1
Compressor Control Table
Low
Condensation Temp. [Tc]
High
A
B
C
D
Low
Evaporation Temp. [Te]
High
UP
STOP
slow_UP
Target
DOWN
A
B
C
not_UP
not_UP
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 is
increased, 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 is
decreased, 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←Evaporation Temp. [ Te ]→High
B
C
A
Co
mpre
sso
r
s
t
o
p
UP
DOWN
STAY
B
D
A
C
Low
←
Co
n
d
en
s
ati
o
n Temp. [Tc]
→
High
Target
42.8°F (6°C)
37.4°F (3°C)
32°F (0°C)
26.6°F (-3°C)
110.3°F
(43.5°C)
123.8°F
(51°C)
136.4°F
(58°C)
118.4°F
(48°C)
114.8°F
(46°C)
3. Compressor Control