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Heat Controller, Inc. VMH SERIES Service Manual
22
Note:
When T1-Ts stays in the same temp. zone for 3 minutes, the compressor will run as follows:
A~E: Increases the frequency to level F8.
F: Maintains the current frequency.
G: Decreases the frequency to the lower level F1.
H: Runs at F1 for 1h.(if T1-Ts<28°F/-2°C, compressor will stop)
Meanwhile, the compressor running frequency is limited by the current.
If the current increases more than I2COOL, the frequency will decrease automatically, if the current raises
to over I3COOL, the compressor will stop and restart 3min later.
When the frequency decreases and the current deceases to between I1COOL and I2COOL, the frequency
will hold. If the frequency does not change for 3min, the frequency will increase to a higher level, and it can
increase twice at most.
If the current deceases to lower than I1COOL, the frequency limit will be invalid.
Model
Current
I1COOL I2COOL I3COOL
VMH09SC-1 5.2 6.4 7.5
VMH12SC-1 5.2 6.4 7.5
VMH18SC-1 5.2 6.4 7.5
VMH24SC-1 10 11 13
Frequency decreases
Frequency
holds