Outdoor Fan Control; Cooling Fan Control; Revolution Frequency Allocation Of Fan Taps - Toshiba Carrier RAV-SP180AT2-UL Service Manual

3. Outdoor fan control

RAV-SP W1
180AT2-UL 200

3-1) Cooling fan control

The outdoor fan is controlled by TE sensor, TO sensor and the operation frequency. It is controlled
by every 1 tap of DC fan control (15 taps).
Only for 60 seconds after start-up of operation, it is fixed by the maximum fan tap corresponded to
the zone in the following table, and then the fan is controlled by temperature of TE sensor.
When temperature of TD sensor became high sufficiently, it is controlled so that the fan revolution
frequency will become higher ignoring TE sensor temperature.
TE
˚F (˚C)
Up to the maximum
revolution frequency of each zone
∗ Operation with W1 in case of fan-OFF
89.6 (32)
Revolution frequency hold
84.2 (29)
Down to the minimum
revolution frequency of each zone
Temp. range
100.4°F (38°C) ≤ TO
82.4°F (28°C) ≤ TO < 100.4°F (38°C)
59°F (15°C) ≤ TO < 82.4°F (28°C)
41.9°F (5.5°C) ≤ TO < 59°F (15°C)
32°F (0°C) ≤ TO < 41.9°F (5.5°C)
23°F (–5°C) ≤ TO < 32°F (0°C)
TO < 23°F (–5°C)
TO error
Revolution frequency allocation of fan taps [rpm]
W2 W3 W4 W5
250 300 400 480
+1 tap / 20 sec
–1 tap / 20 sec
20 Hz or lower
Min.
W6
W5
W3
W2
W1
W1
OFF
W1
W6 W7 W8 W9
500 520 560 640
TD
˚F (˚C)
185 (85)
176 (80)
167 (75)
149 (65)
20Hz to 45Hz
Max. Min.
WB W7
WA W6
W7 W4
W5 W3
W3 W2
W2 W1
OFF OFF
WB W1
– 33 –
WA WB WC WD
670 700 750 800
Operation with WF
Operation with
the maximum tap
of each zone
Normal fan control
by TE sensor
45Hz or higher
Max. Min.
WE W9
WD W8
W9 W6
W7 W5
W5 W3
W3 W2
OFF W1
WE W1
WE WF
880 980
Max.
WF
WE
WB
W9
W7
W4
W3
WF