Service manual
(2) Vane control
Automatic control (Auto vane lamp is on.)
0
During COOL operation
The vane is at position '1
J
initially
-+
power ON
-+
moves to position '2J retums to '1
J
-+
fixes on '1
J
0
During HEAT operation
Power ON
-+
the vane moves to position '2J
-+
moves to '1
J
ountil the temp. of lndoor coil thermistor RT12 rises to 97°F
:
position '1
J
(on the indoor heat exchanger)
owhen the thermistor temp is 97'F
:
changes position
'1
J
*'2J
OUntil the temp. of lndoor coil thermistor RT12 falls to 86F
:
position '2J
(on the indoor heat exchanger)
owhen the thermistor temp is less than 86°F
:
changes position '2J
-+'I
J
When contactor (52C)
is
off
:
position
'
1
J
0
During defrosting
:
the vane is forced to return to position '1
J
The indoor fan speed is VLO while the vane
is
working.
When thermistor (RT12) is 8.6F or below
Comp. contactor (52C)
is
off.
6W
I
'23
90
When Thermistor (RT12) is 97'F
or above.
lndoor
coil
Thermistor
RT12
temp.
EMERGENCY-TEST
operation
When the remote controller is missing, has failed or the batteries run down, set the emergency run selector switch on the
front of the indoor unit to heat or cool and press the emergency run on/off switch. The unit will
start
and the operation lamp
will
light.
The
first
30
min. of operation will
be
the test run operation.
This operation is for servicing. The indoor fan runs at high
speed and the system is in continuous operation. The thermostat does not operate and the timer is reset to normal.
After
30
min. of test run operation the system shifts to emergency run operation with a set temperature of 75°F in heating
or cooling. The fan shi to MED speed.
This operation continues until the emergency run on/off button is pressed or a button on the remote control is pressed, then
normal operation will start.
The coil frost prevention circuit operates in this mode.
EMERGENCY RUN
-
COOL
EMERGENCY
I
ONIOFF button