Emergency-Test Operation; Outline Drawing Of Main Power Supply - Mitsubishi Electric Mr.Slim MSZ09UN Service Manual

8-8. EMERGENCY-TEST OPERATION

In case of test run operation or emergency operation, use the EMERGENCY OPERATION switch on the front of the
indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of remote
controller run down. The unit will start and the OPERATION INDICATOR lamp will light.
The first 30 minutes of operation is the test run operation. This operation is for servicing. The indoor fan speed runs at
High speed and the system is in continuous operation. (The thermostat is ON.)
After 30 minutes of test run operation the system shifts to EMERGENCY COOL / HEAT MODE with a set temperature of
75˚F.
The fan speed shifts to Med. speed.
The coil frost prevention works even in emergency operation, and defrosting cycle as well.
In the test run or emergency operation, the horizontal vane operates in VANE AUTO (
Emergency operation continues until the EMERGENCY OPERATION switch is pressed once or twice or the unit receives
any signal from the remote controller. In case of latter normal operation will start.
NOTE : Do not press the EMERGENCY OPERATION switch during normal operation.
MSZ09UN
EMERGENCY OPERATION
switch
MSZ12UN
EMERGENCY OPERATION
switch
8-9. Main power supply circuit

Outline drawing of main power supply

L62
POWER
SUPPLY
NOISE FILTER P.C. BOARD
1. Outline of main power supply circuit
(1) When the electricity is turned on to the outdoor unit
Rush current generates in the main power supply circuit.
To prevent the rush current from running into the main power supply circuit, R64(Current-limiting resistor) absorbs
the rush current.
After the rush current is absorbed, X64(Relay) is ON and the circuit to R64 is short-circuited, then the electricity to
R64 is bypassed.
Following the indoor unit's operation, X64 is switched to ON or OFF.
R64
X64
CT61
L63
MICROPROCESSOR
ELECTRONIC CONTROL P.C. BOARD
• The following indication applies regardless of shape
of the indicator.
OPERATION INDICATOR lamp
Press once
<Cool>
Press again
<Heat>
Press once again
<Stop>
DS62
DS61
(~)
L61
(+)
(–) (~)
(~)
(+)
(–) (~)
+ +
–
–
C63
C61
33
) mode.
IPM
P
V
U
V
U W
W
R61
N
COMPRESSORE