Heat Controller VMH18SC-1, VMH12SC-1, VMH24SC-1, VMH09SC-1 Frequency decreases Holds, Model Current

Heat Controller, Inc. VMH Series Service Manual

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.

Frequency decreases

Frequency

holds

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

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