Johnson Controls YVAHP036B21S - (10) Priority of Protection Control; (11) Degeneration Control

OUTDOOR UNITS
2-28
TC-16001-rev.5
(11) Degeneration Control
Degeneration Control is performed to change the protection control range.
This control sequence will suppress re-occurring alarms in response to repeated equipment restarts
during protection control conditions listed below.
< Example of Discharge Temperature Increase Protection Control >
< Related Protection Control >
(1) Pressure Ratio Decrease Protection Control (P1)
(2) High Pressure Increase Protection Control (P2)
(3) Inverter Current Protection Control (P3)
(4) Inverter Fin Temperature Increase Protection Control (P4)
(5) Discharge Temperature Increase Protection Control (P5)
Abnormal Stoppage
(Stoppage Cause d1-15)
Normal: Td > 203°F (95°C)
Degeneration: Td > 194°F (90°C)
Normal: Td < 194°F (90°C)
Degeneration: Td < 185°F (85°C)
Normal: Td > 206°F (97°C)
Degeneration: Td > 198°F (92°C)
Normal: Td < 203°F (95°C)
Degeneration: Td < 194°F (90°C)
Td > 257°F (125°C) for 5 sec. or
Td > 239°F (115°C) for 10 min.
Normal Operation
Frequency Forced Decrease
(0.25Hz/sec.)
Prohibition of Frequency Increase
(Except Frequency Decrease Only)
(10) Priority of Protection Control
If two or more protection controls meet a condition, the protection controls perform according to the
following.
Rank Order. Indication Protection Control Performed
1 P1 Pressure Ratio Protection Control
2 P2 High Pressure Increase Protection Control
3 P3 Inverter Current Protection Control
4 P4 Inverter Fin Temperature Increase Protection Control
5 P5 Discharge Temperature Increase Protection Control
6 P6 Low Pressure Decrease Protection Control
7 PA Demand Current Control
8 Pd Low Pressure Increase Protection Control
9 P9 High Pressure Decrease Protection Control
2
Lower Rank Order of Protection Control Function
Forced
Decrease
Forced
Increase
Prohibition
of Increase
Prohibition
of Decrease
1
Higher Rank Order
of Protection
Control Function
Forced Decrease
1 1 1 1
Forced Increase
1 1 1 1
Prohibited Increase
2 1
2
*1
1
Prohibited Decrease
2 2 2 2
*1: Discharge Temperature Increase Protection Control (P5) is higher than the following protection controls.
a) Low Pressure Decrease Protection Control (P6)
b) Demand Current Control (PA)