253
FDTN-H
Tho-A (
°
C)
Tho-R (
°
C)
C Zone
D Zone
E Zone
F Zone
UHi
UHi
UHi
A Zone
UHi
Hi
Hi
B Zone
UHi
Hi
Lo
Description of control for fan for outdoor unit
(c)
Operation control function by the outdoor controller (Only case of FDC308, 408, 508 type)
1)
Control for outdoor unit fan
a)
Cooling Operation
The speed of the fan for the outdoor unit is controlled by the temperature of the heat exchanger (Tho-R detection) and
the outdoor air temperature (Tho-A).
E Zone
48
Heat exchanger temperature (
°
C)
32
63
57
C Zone
D Zone
B Zone
18
Outdoor air temperature (
°
C)
15
33
31
F Zone
A Zone
Tho-A (
°
C)
Tho-R (
°
C)
C Zone
D Zone
E Zone
Lo
Hi
A Zone
Hi
UHi
B Zone
UHi
UHi
Description of control for fan for outdoor unit
B Zone
11
Outdoor air temperature (
°
C)
9
19
17
E Zone
A Zone
-3
Heat exchanger temperature (
°
C)
0
C Zone
D Zone
3
Outdoor air temperature (
°
C)
5
Outdoor fan
operates
at Hi speed
Outdoor fan
stopped
b)
Heating Operation
1
Stop control for outdoor fan
When the high pressure switch (63H
2
) operates, the fan for the outdoor unit is stopped to control the high pressure
switch.
63H
2
settings
2.5 OFF/2.06 ON (MPa) [25.5 OFF/21 ON (kgf/cm
2
G)]
2
Tap control for outdoor fan
When the high pressure switch (63H
2
) is closed, the outdoor fan is controlled by the detected heat of the outdoor
heat exchanger thermistor (Tho-R) and the detected heat of the outdoor air temperature thermistor (Tho-A).
2)
Control of fan for outdoor unit for de-icing
If DIP switch SW5-2 on the printed circuit board for the outdoor unit is set to on, the
fan on the outdoor unit which has been stopped will operate for 10 seconds at Hi speed
every 10 minutes when the outdoor air temperature is 3
°
C or less.
Note (1)
When the fan for the outdoor unit is started when the outdoor air temperature is more than 12
°
C, it will operate at
high speed for 3 seconds and then switch to low speed. After operating a low speed for 4 minutes, it will be
transferred to controlled speed.
Summary of Contents for FDT208HEN-S
Page 74: ...MEMO...
