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Service Manual VMH SERIES Heat Controller, Inc.
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After A/C starts up, the compressor will run at the Fmax frequency for 7 minutes according to outdoor
ambient temp. During the 7 minutes, frequency limitation is active.
7 minutes later, compressor running frequency will be controlled as below:
While
Temp. zone
A
B
C
D
E
F
G
Frequency
F10
F9
F8
F7
F5
F3
F4
ΔT=32°F/0°C as default.
Note:
When T1-Ts stays in the same temp. zone for 3 minutes, the compressor will run as follows:
A~E: Increase the frequency to the higher level F10.
F: Keeps the current frequency.
G: Decreases the frequency to the lower level F1.
H: Runs at F1 for 1h. (If T1-Ts-ΔT >43°F/6°C, compressor will stop)
T1-Ts-ΔT
°F °C
41 (+5.0)
40 (+4.5)
38 (+3.5)
37 (+3.0)
37 (+2.5)
36 (+2.0)
35 (+1.5)
34 (+1.0)
33 (+0.5)