Johnson Controls YVAHP036B21S - P4: Inverter Fin Temperature Increase Protection Control; P5: Discharge Temperature Increase Protection Control; P6: Low Pressure Decrease Protection Control

OUTDOOR UNITS
2-26
TC-16001-rev.5
(4) P4: Inverter Fin Temperature Increase Protection Control
Inverter Fin Temperature Increase Protection Control is performed in order to prevent an inverter trip
caused by a temperature increase of the inverter n.
Tn: Detected Value of Inverter Fin Thermistor [°F (°C)]
(5) P5: Discharge Temperature Increase Protection Control
Discharge Temperature Increase Protection Control is performed in order to protect the compressor
motor coil from an increase of discharge temperature during an abnormality.
< Details of Control >
Td: Detected Value of Discharge Gas Thermistor [°F (°C)]
(6) P6: Low Pressure Decrease Protection Control
Low Pressure Decrease Protection Control is performed in order to protect the compressor from a
transitional decrease of suction pressure.
Ps: Detected Value of Low Pressure Sensor [psi (MPa)]
< Details of Control >
< Details of Control >
Normal Operation
Frequency Forced Decrease
(0.125Hz/sec.)
Frequency Forced Decrease
(0.5Hz/sec.)
Prohibition of Frequency Increase
(Except Frequency Decrease Only)
Tn > 168°F (76°C)
Abnormal Stoppage
(Stoppage Cause d1-17)
Tn > 176°F (80°C)
Tn > 186°F (86°C)
Tn > 194°F (90°C)
Tn < 174°F
(79°C)
Tn < 186°F
(86°C)
Tn < 166°F
(74°C)
Td > 206°F (97°C)
Td > 257°F (125°C)
for 5 sec. or
Td > 239°F (115°C)
for 10 min.
Abnormal Stoppage
(Stoppage Cause d1-15)
Normal Operation
Frequency Forced Decrease
(0.25Hz/sec.)
Prohibition of Frequency Increase
(Except Frequency Decrease Only)
Td > 203°F (95°C) Td < 194°F (90°C)
Td < 203°F (95°C)
Ps < 15psi (0.10MPa)
Ps > 22psi (0.15MPa)
Ps > 29psi (0.20MPa)
Abnormal Stoppage
(Stoppage Cause d1-15)
Ps < 13psi (0.09MPa) for 12 min.
Normal Operation
Frequency Forced Decrease
(0.25Hz/sec.)
Prohibition of Frequency Increase
(Except Frequency Decrease Only)
Ps < 15psi
(0.10MPa)