Carrier 38VMH-1P Service Manual page 26

:
OUTDOOR FAN CONTROL
There are eight step levels (W1 to W8); however, OFF = 0 rpm is not displayed as a step level.
FAN
Up
RPM
Down
Fan Control in Cooling Mode
Table 27 —Fan Control by Outdoor Temperature (T4) and Compressor Frequency
38VMB036~060HDS3-1
T4 ≥ 84.2°F
62.6°F ≤ T4 < 84.2°F
41°F ≤ T4 < 62.6°F
32°F ≤ T4 < 41°F
23°F ≤ T4 < 32°F
T4 < 23°F
SEQUENCE:
1. Outdoor fan will come on (W7) for 20 seconds before compressor starts.
2. Outdoor fan continues to run (W7) for another 20 seconds after compressor starts.
3. Based on outdoor temperature (T4), outdoor fan will follow step level for another 40 seconds as shown in table above.
4. 60 seconds after the compressor starts, outdoor fan step level is determined based on T4, T5, and Tc.
Method B shows the T4 < 23°F operation as mentioned in the above table.
Fig. 33 —Fan Control Correction by Compressor Discharge Temperature (T5)
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 26 —Eight Steps of Outdoor Fan Control
OFF W1 W2
0 300 330
0 0 300
Frequency < 34
Minimum Maximum
W2 W7
W1 W4
OFF W2
OFF W1
OFF W1
OFF OFF
Fig. 32 —Fan Control by Condensing Temperature (Tc)
L*: Outdoor fan runs at maximum speed according to fan control by T4 and frequency
table. Under the condition that the maximum speed is OFF, use W1 instead.
W3 W4
400 460
380 440
34 ≤ Frequency < 48
Minimum Maximum
W4 W7
W2 W6
W1 W4
W1 W2
W1 W2
OFF OFF
26
W5 W6 W7
520 630 780
500 610 760
Frequency ≥ 50
Minimum Maximum
W6 W7
W4 W6
W3 W6
W1 W4
W1 W2
OFF OFF
A210260A210266
A210267