NO. Item Specification outline Remarks
(TF type)
(1) Under HEAT operation, the higher temperature of TC2 sensor and TCJ sensor
is compared with temperature of TC1 sensor then lower temperature is used to
set the upper limit of the fan tap.
Under defrosting operation, the control point is set to +43°F.
TCJ : Temperature
of Indoor heat
exchange sensor
In zone A,
“PRE-HEAT" is
displayed.
8
Freeze
prevention
control (low
temp. release)
1.During cooling, the air conditioner is operated in the manner
described below according to the temperature readings of the TC1,
TC2 and TCJ sensors.
• If zone J operation is detected for 5 minutes, the air conditioner is
forced into thermostat OFF.
• In zone K, the timer is put on pause, with the current timer count
retained.
• If zone I operation is detected, the timer count is cleared, and the
air
conditioner returns to normal operation.
• If continuous zone J operation forces the air conditioner into
thermostat OFF, the indoor fan is operated in breeze mode until it
moves into zone I. The control is terminated under the following
conditions:
Termination conditions
1) TC1 ≥ 54°F, TC2 ≥ 54°F, and TCJ ≥ 54°F
2) Passage of 20 minutes after stoppage
2.During cooling, the air conditioner is operated in the manner
described below according to the temperature readings of the TC2
and TCJ sensors.
• If zone M operation is detected for 45 minutes, the air conditioner
is forced into thermostat OFF.
• In zone N, the timer is put on pause, with the current timer count
retained.
• When the air conditioner goes back into zone M, timer count is
resumed from the retained value.
• If zone L operation is detected, the timer count is
cleared, and the
air conditioner returns to normal operation.
Reset conditions
1) TC1 ≥ 54°F, TC2 ≥ 54°F and TCJ ≥ 54°F
2) Passage of 20 minutes after stoppage
P1
Q1
(˚F)
a
K
J
P1
Q1
TC1
50˚F(41˚F)
32˚F
TC2, TCJ
14˚F
7˚F
I
(˚F)
P2
Q2
L
N
M
P2
Q2
TC2, TCJ
41
28
• If this control occurs
frequently, check the
mounting position of
the temperature
sensor. The TC1
sensor position may
be incorrect.
9 Refrigerant
(Oil) recovery
control in
cooling
operation
Indoor units during stop/thermostat OFF or FAN operation perform
following controls when a refrigerant (compressor oil) recovery signal is
received from outdoor unit at the cooling operation,
(1) Opening the indoor unit PMV at constant valve opening.
(For a maximum of about 4 minutes)
Control is performed per
two hours or when the
outdoor unit determines
its need.(It varies
depending on the indoor
units connected.)
A zone : OFF
E zone: follow a remote controller
fan speed setup
The TF temperature is also included
in the judgment when moving from E
to A zone. In addition to (1), if the TF
temperature is 41°F. or less, it will
move to the A zone.
59
41
(˚F)
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