-
177
-
'18 • SCM-T-251
(20)
Abnormal temperature sensor (return air/indoor heat exchanger) broken wire/short-circuit detection
(a) Broken wire detection
When the return air temperature sensor detects -55°C or lower or the heat exchanger temperature sensor detect -55°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 sensor: E7, the heat exchanger temperature sensor: E6).
(b) Short-circuit detection
If the heat exchanger temperature sensor 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).
■
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 option 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
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
(21) External input/output control (CnT or CnTA)
External input/output connectors are provided on the indoor unit control PCB, and each input/output is possible to be
changed by RC-EX3.
Be sure to connect the wired remote control to the indoor unit. Remote operation with CnT/CnTA only is not possible.
・
CnT
・
CnTA
XR1
1
2
3
4
5
6
XR3
XR4
CnT
Blue
12V
XR2
CnTA
Blue
12V
1
2
Input/Output Connector Factory default setting RC-EX3 function name
Output
CnT-2 (XR1) Operation output External output 1
CnT-3 (XR2) Heating output External output 2
CnT-4 (XR3) Compressor ON output External output 3
CnT-5 (XR4) Inspection(Error) output External output 4
"Input
(Volt-free contact)"
CnT-6 (XR5) Remote operation input External input 1
CnTA (XR6) Remote operation input External input 2
(a) Output for external control (remote display)
Indoor unit outputs the following signal for operation status monitoring.
Output name Condition
1 Operation output During operation
2 Heating output During heating operation
3 Compressor ON output During compressor operation
4 Inspection(Error) output When anomalous condition occurs.
5 Cooling output During cooling operation
6 Fan operation output 1 When indoor unit's fan is operating
7 Fan operation output 2 When indoor unit's fan is operating, and fan speed is higher than Hi speed.
8 Fan operation output 3 When indoor unit's fan is operating, and fan speed is Lower than Me speed.
9 Defrost/oil return output When indoor unit receive defrost/oil return signal from the outdoor unit.
10 Ventilation output When "Venti.ON" is selected from remote control
11 Free cooling output When the ambient temp. is between 10 - 18 C in cooling and fan operation
12 Indoor unit overload alrm output Refer to "IU overload alarm"
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