Specifications

Detailed Control Functions SiBE341027
54 Function
2.5.3 Discharge Pipe Protection Control
This discharge pipe protection control is used to protect the compressor internal temperature against an error
or transient increase of discharge pipe temperature.
In case of multi-outdoor-unit system, each outdoor unit performs this control individually in the following
sequence.
[INV. compressor]
[STD. compressor]
In case of multi-outdoor-unit system, each outdoor unit performs this control individually in the following sequence.
&
•HTdi < 115 ˚C
•After 20 seconds
&
•HTdi > 115 ˚C
•After 30 seconds
OR
•HTdi > 135 ˚C
•HTdi > 120 ˚C continues for 10 minutes
Normal operation
INV. compressor
1 step down
Compressor
62Hz + ON + OFF
Compressor
62Hz + OFF + OFF
Restart standby: 10 minutes
(2 times per 100 minutes at max.)
Stop due to error
(“
F3” displayed)
INV. compressor 1
step up
Current step maintained
HTdi > 115 ˚C
(Without preconditions)
(Without preconditions)
HTdi < 100 ˚C
HTdi > 120 ˚C continues for 90 seconds
HTdi > 120 ˚C continues for 90 seconds
HTdi: Value of INV. compressor discharge pipe
temperature compensated with outdoor
air temperature
Discharge pipe temperature
standby 3 times per 100 minutes
OR
STD compressor stops
10 min.
Normal operation
• HTds > 120˚C continues for a period of
continuous 5 min. or more
• HTds > 135˚C
HTdS: Value of STD compressor discharge
pipe temperature (Tds) compensated
with outdoor air temperature.