Specifications

73
8-3. HEAT operation
Control mode
Mode Function
RemarksControl
Outdoor
fan control
Normal
Outdoor fan rotation frequency depends on the evaporating temperature
(TH3).
• Rotation frequency control : Pulsation control
• Rotation frequency : Output step N=1~15 (Output voltage=0~230V)
• Evaporating temperature range: –5 ~ 15˚C
• Compressor starting :When the compressor starting, the outdoor fan is
locked for 2 minutes of initial step.
Others
Refer to page 75
for defrosting.
Note1: Refer to
the table below
for lower limit of
output step.
Target control
Temperature
5~10°C
1Outdoor fan stops (output step = 0) during the suspension of compressor
or defrosting.
2When the SW5-1 in the outdoor controller board set to ON, the outdoor
fan output is always locked to 16 (100% output).
Normal control
LEV opening should be controlled to become the SC level of the target at
regular intervals, according to the detection temperature of thermistors
installed in the heat exchanger of the condenser.
W The target, SC level is different according to the capacity, the type of
the indoor unit, and the operating state. (Normal: 4~10˚C)
W The SC level are calculated as follows;
HEAT : TH5–TH2
LEV control
Compressor
Thermostat
Thermostat starts or stops by the signal of the set temperature and room
temperature from the indoor unit.
(Detecting method depends on indoor unit.)
Indoor frost pre-
vention
[Operating condition]
When there is at least 1 indoor unit which has changed to frost prevention
mode, the compressor will stop. After stop the compressor when the frost
prevention mode is released, the compressor will restart.
[Time chart]
3 minutes
or more
Indoor unit
Frost prevention
Normal
ON
OFF
Compressor
Fan’s
output
step
TH3 [˚C]
TH3<10
10[TH3<8
18[TH3
14
9
Lower limit
Opening at upper and lower limit
P1
P1.6
P2
P2.5
500
600
1000
800
300
330
300
280
P3
P4
P5
P6
800
1500
1200
1500
320
420
450
490
Model Upper limit Lower limit Upper limit Lower limitModel
Unit is controlled at one-minute intervals.
Desired subcooling degree: 4-10˚C (It depends on each model and the
operating condition.)
Pulse width: ±30 pulse at the maximum
StepModel
P1
P1.6
P2
P2.5
P3
P4
P5
P6
3
3
3
3
3
3
1
1
OCT03-E-3.qxp 04.3.26 1:50 PM Page 73