Mitsubishi Heavy Industries SCM71ZM-S1 Technical Manual page 169

(b) Control of input signal
Control of input signal (switch input, timer input) connectors (CnT) are provided on the printed circuit board of indoor unit.
However, when the operation of air-conditioner is under the " CENTER " mode, the wired remote control by CnT is invalid.
(i) Level input
If the factory settings (Jumper wire J1 EXTERNAL INPUT on the PCB of indoor unit) are set, or "LEVEL INPUT"
is selected in the wired remote control's indoor unit settings.
1) Input signal to CnT OFF → ON
2) Input signal to CnT ON → OFF
CnT Input
Unit
(CASE A)
Unit
(CASE B)
(ii) Pulse input
When Jumper wire J1 on the PCB of indoor unit is cut at the field or "PULSE INPUT" is selected in the wired remote
control's indoor unit settings.
Input signal to CnT becomes valid at OFF → ON only and the motion of air-conditioner [ON/OFF] is inverted.
CnT Input
Unit
(CASE A)
Unit
(CASE B)
(18) Hot keep operation
If the hot keep operation is selected during the heating operation, the indoor fan is controlled based on the temperature of the
indoor heat exchanger (Th2) to prevent blowing of cool wind.
However, if the fan speed setting is HI and room temperature is 19°C or higher, this control is not executed.
(19) Frost prevention control
(a) Operating conditions
(i)
(ii)
8
(b) Detail of anti-frost operation
Operation mode
Item
Compressor operation
Indoor fan
(c) Reset condition:
ON
OFF
ON
OFF
*ON
ON
ON
OFF
OFF
ON
OFF
ON
OFF
Protective control
Forced outage
168
-
Air-conditioner ON
Air-conditioner OFF
ON
OFF
OFF
*ON
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
2.5
Reset
Operation instruction
Depends on operation mode
-
'17 • SCM-T-225
Note (1) The ON with the * mark indi-
cates an ON operation using the
wired remote control, etc.
Reset
Protective
control
2.5 8
Indoor heat exchanger
temperature (ºC)