Mitsubishi Heavy Industries SRK20ZJX-S Service Manual page 26

(t) Operation permission/prohibition
(In case of adopting card key switches or commercially available timers)
When the indoor function setting of wired remote controller for "Operation permission/prohibition" is changed from "Invalid
(Factory default)" to " Valid", following control becomes effective.
CnT
Blue
12V
CnT-6
Only the "LEVEL INPUT" is acceptable for external input, however when the indoor function setting of
*1
"Level input (Factory default)" or "Pulse input" is selected by the function for "External input" of the wired remote
controller, operation status will be changed as follows.
In case of "Level input" setting
Unit operation from the wired
remote controller becomes
*(1) In case that "Operation permission/prohibition mode" setting is "Valid" and "External input" setting is "Level
input (Factory default)";
When card key switch is ON (CnT-6 ON: Operation permission), start/stop operation of the unit from the
wired remote controller becomes available.
When card key switch is OFF (CnT-6 OFF: Operation prohibition), the unit stops operation in conjunction
with OFF signal, and start/stop operation of the unit from the wired remote controller becomes not available.
*(2) In case that "Operation permission/prohibition mode" setting is "Valid" and "External input" setting is "Pulse
input (Local setting)";
When card key switch is ON (Operation permission), the unit starts operation in conjunction with ON signal.
and also start/stop operation of the unit from the wired remote controller becomes available.
When card key switch is OFF (Operation prohibition), the unit stops operation in conjunction with OFF signal, and
start/stop operation of the unit from the wired remote controller becomes not available.
(3) This function is invalid only at "Center mode" setting done by central controller.
(u) External input/output control (CnT)
Be sure to connect the wired remote controller to the indoor unit. Without wired remote controller remote operation by CnT is
not possible to perform.
Optional
1
2
XR1
CnT 3
XR2
Blue
4
12V XR3
5
XR4
6
XR5
1) Output for external control (remote display)
Following output connectors (CnT) are provided on the indoor control PCB for monitoring operation status.
Operation output: Outputs DC12V signal for driving relay during operation
Heating output: Outputs DC12V signal for driving relay during heating operation
Thermostat ON output: Outputs DC12V signal for driving relay when compressor is operating.
Error output: Outputs DC12V signal for driving relay when anomalous condition occurs.
Optional
1
2
XR1
3
XR2
4
XR3
5
XR4
6
XR5
Normal operation
(Factory default)
ON
Operation
In case of "Pulse input" setting
available*(1)
Operation output
Heating output
Thermostat ON output
Error output
Remote operation input
Card key
switch
XR5
Operation permission/prohibition mode
OFF
Stop
permission*1
Unit starts operation
*(2)
(CnT-2: XR1)
(CnT-3: XR2)
(CnT-4: XR3)
(CnT-5: XR4)
(CnT-6: No-voltage contactor)
25
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'10 • SCM-SM-094
"Valid" (Local setting)
ON OFF
Operation Operation prohibition
(Unit stops)