(20)
Abnormal temperature thermistor (return air/indoor heat exchanger) wire/short-circuit detection
(a) Broken wire detection
When the return air temperature thermistor detects -50°C or lower or the heat exchanger temperature thermistor detect
-50°C or lower for 5 seconds continuously, the compressor stops. After a 3-minute delay, the compressor restarts but,
if it is detected again within 60 minutes after the initial detection for 6 minutes continuously, stops again (the return air
temperature thermistor: E7, the heat exchanger temperature thermistor: E6).
(b) Short-circuit detection
If the heat exchanger temperature thermistor detects 70°C or higher for 5 seconds continuously at 2 minutes and 20
seconds after the compressor ON during cooling operation, the compressor stops (E6).
(21) External input/output control (CnT or CnTA)
Be sure to connect the wired remote control to the indoor unit. Without wired remote control remote operation by CnT is not
possible to perform.
・
CnT
・
CnTA
①
Operation output (CnT-2: XR1)
②
Heating output (CnT-3: XR2)
③
Compressor ON output (CnT-4: XR3)
④
Error output (CnT-5: XR4)
⑤
Remote operation input (CnT-6: Volt-free contact)
XR1
1
2
3
4
5
6
XR3
XR4
CnT
Blue
XR2
Option
■
Priority order for combinations of CnT and CnTA input.
Note (1) Following operation commands are accepted when the operation prohibition is set with CnTA as indicated with *.
Individual operation command from remote control, test run command from outdoor unit and operation command from optional device, CnT input.
Reference: Explanation on the codes and the combinations of codes in the table above
1.
In case of CnT “Number”, the CnT “Number” is adopted and CnTA is invalidated.
2.
In case of CnTA “Number”, the CnTA “Number” is adopted and CnT is invalidated.
3.
In case of CnT “Number”/CnTA “Number”, the CnT “Number” and the CnTA “Number” become independent functions each other.
4.
In case of CnT “Number” + CnTA “Number”, the CnT “Number” and the CnTA “Number” become competing functions each other.
5.
In case of CnT “Number” > CnTA “Number”, the function of CnT “Number” supersedes that of CnTA “Number”.
6.
In case of CnT “Number” < CnTA “Number”, the function of CnTA “Number” supersedes that of CnT “Number”.
(The “Number” above means
①
-
⑥
in the table.)
CnTA
Blue
1
2
CnTA
①
Operation stop
level
②
Operation stop
pulse
③
Operation
permission/prohibition
④
Operation
permission/prohibition pulse
⑤
Cooling/heating
selection level
⑥
Cooling/heating
selection pulse
CnT
①
Operation stop level CnT
①
CnT
①
CnT
①+
CnTA
②
CnT
①
CnT
①/
CnTA
⑤
CnT
①/
CnTA
⑥
②
Operation stop pulse CnT
②
CnT
②
CnT
②+
CnTA
③
CnT
②
CnT
②/
CnTA
⑤
CnT
②/
CnTA
⑥
③
Operation permission/prohibition level
CnT
③>
CnTA
①
CnT
③>
CnTA
②
CnT
③+
CnTA
③
CnT
③
CnT
③/
CnTA
⑤
CnT
③/
CnTA
⑥
④
Operation permission/prohibition pulse
CnT
④
CnT
④
CnT
④+
CnTA
③※
CnT
④
CnT
④/
CnTA
⑤
CnT
④/
CnTA
⑥
⑤
Cooling/heating selection level
CnT
⑤/
CnTA
①
CnT
⑤/
CnTA
②
CnT
⑤/
CnTA
③※
CnT
⑤/
CnTA
④
CnT
⑤
CnT
⑤
⑥
Cooling/heating selection pulse
CnT
⑥/
CnTA
①
CnT
⑥/
CnTA
②
CnT
⑥/
CnTA
③
CnT
⑥/
CnTA
④
CnT
⑥
CnT
⑥
(a) Output for external control (remote display)
Following output connectors (CnT) are provided on the indoor control PCB for monitoring operation status.
①
Operation output:
Outputs DC12V signal for driving relay during operation
②
Heating output:
Outputs DC12V signal for driving relay during heating operation
③
Compressor ON output:
Outputs DC12V signal for driving relay when compressor is operating.
④
Error output:
Outputs DC12V signal for driving relay when anomalous condition occurs.
(b) Remote operation input
Remote operation input connector (CnT-6 or CnTA) is provided on the indoor control PCB.
However remote operation by CnT-6 or CnTA is not effective, when “Center mode” is selected by central control.
Only the “LEVEL INPUT” is acceptable for external input
, however when the indoor function setting of “Level
input (Factory default)” or “Pulse input” is selected by the function for “External input” of the wired remote control,
operation status will be changed as follows.
-
183
-
'16 • SCM-T-199
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