Protective Control Function - Mitsubishi Heavy Industries SRK20ZJX-S Service Manual

(a) Level input
If the factory settings (Jumper wire J1 EXTERNAL INPUT on the PCB of indoor unit) are set, or "LEVEL INPUT" is se-
lected 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)
(b) 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 con-
trol'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)

1.8 Protective control function

(1) Frost prevention control
(a) Operating conditions
8
(b) Detail of anti-frost operation
Operation mode
Item
Compressor operation
Indoor fan
(c) Reset conditions:
(2) Cooling overload protective control
(a) Operating conditions:
Item
Outdoor air temperature
Lower limit speed
(b) Detail of operation
(c) Reset conditions:
(3) Cooling high pressure control
Air conditioner ON
Air conditioner OFF
ON
OFF
ON
OFF
*ON
ON
ON
OFF
OFF
ON
OFF
ON
OFF
Protective control
Forced outage
Model
SCM 40~80 ZJ-S
ON
OFF
OFF
*ON
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
2.5
Reset
Operation instruction
Depends on operation mode
33
- -
'10 • SCM-SM-094
Note (1) The ON with the * mark indicates an
ON operation using the remote control
unit switch, etc.
'09•SRK-DB-087D
Protective
control
2.5
Indoor heat exchanger
temperature (ºC)
ON2
ON1
OFF
40 41 46 47
Outdoor air temperature (
Reset
8
)
º C