Table of Contents
Advertisement
CHAPTER 3.
FUNCTION AND OPERATION OF PROTECTIVE PROCEDURES
[1] PROTECTIVE FUNCTIONS AND OPERATIONS
NO.
Function
1
DC over current
2
AC over current
Compressor over-
3
heat prevention con-
trol
Compressor high
4
temperature error
Outdoor heat
5
exchanger overheat
prevention control
6
Thermistor short
7
Thermistor open
AC abnormal cur-
8
rent
9
Serial signal error
Miswiring check
10
error
Indoor heat
11
exchanger overheat
prevention control
Power factor mod-
12
ule (Active Filter)
over voltage error
Power factor mod-
13
ule (Active Filter)
low voltage error
Description
Compressor is stopped if a current approxi-
mately 24A or more flows in the power tran-
sistor module.
Lowers the operating frequency if the com-
pressor AC current exceeds set value
(16.0A). Stops the compressor if the current
exceeds at minimum frequency.
Lowers the operating frequency if the tem-
perature of the compressor thermistor (TH1)
rises above 108°C. Compressor is stopped if
the thermistor stay above 108°C for 2 min-
utes at minimum frequency.
Compressor is stopped if the compressor
thermistor is above 113°C (Or when TH1
shorts)
Lowers the operating frequency if the tem-
perature of the outdoor heat exchanger rises
above 57°C during cooling. Stops the com-
pressor if the temperature stays above 57°C
for 2 minutes at minimum frequency
Compressor ia stopped, if heat exchanger or
outdoor thermistor shorts. Close the expan-
sion valve of the corresponding room, if
some suction thermistor shorts.
Compressor is stopped, if compressor or
heat exchanger or outdoor thermistor opens.
Close the expansion valve of the corre-
sponding room, if some suction thermistor
shorts. opens.
Compressor is stopped, if the operating fre-
quency is above 70Hz and the compressor
current is below 0.8A.
INDOOR
If open, while timer LED blinks, operation is
continued. If short, operation is continued.
OUTDOOR
Closes the expansion valve of the corre-
sponding room if the outdoor unit does not
receive a serial signal from one or more
indoor unit for 30 seconds.
Compressor is stopped, if the outdoor unit
does not receive a serial signal from all
indoor units.
Compressor is stopped, and miswiring check
operation ends.
Lowers the operating frequency if the tem-
perature of any of indoor heat exchanger
rises high temperature during heating.
Stops the compressor if the temperature stay
high for 2 minutes at minimum frequency.
Compressor stops if DC voltage is 450V or
higher.
Compressor stops if DC voltage is 280V or
lower.
Operation
Detection time
Restart condition
Automatically restarts
During compres-
after safety time (180
sor operation
seconds)
Automatically restarts
During compres-
after safety time (180
sor operation
seconds)
Automatically restarts
During compres-
after safety time (180
sor operation
seconds)
Automatically restarts
when thermistor (TH1)
During compres-
temperature falls below
sor operation
99°C (approximately 30
minutes)
Automatically restarts
During compres-
after safety time (180
sor operation
seconds)
When the room
is activated turns
Operation OFF
ON and the com-
pressor starts.
When the room
turns ON and the
Operation OFF
compressor
starts.
Automatically restarts
During compres-
after safety time.(180
sor operation
sec.)
Automatically restarts
as soon as the serial
During operation
communication
becomes possible.
Miswiring check opera-
During miswiring
tion will not restart
operation
automatically.
Automatically restarts
During compres-
after safety time.(180
sor operation
sec.)
Automatically restarts
During compres-
after safety time.(180
sor operation
sec.)
Automatically re-starts
During compres-
after safety time.(180
sor operation
sec.)
3 – 1
Restart
In
Out
time
door
door
4 times
Yes
Yes
4 times
Yes
Yes
No limit
No
No
4 times
Yes
Yes
No limit
No
No
1 time
Yes
Yes
1 time
Yes
Yes
4 times
Yes
Yes
No limit
Yes
Yes
4 times
Yes
Yes
No limit
No
No
4 times
Yes
Yes
4 times
Yes
Yes
Hide quick links:
Advertisement
Table of Contents
