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Heat Controller, Inc. VMH SERIES Service Manual
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Meanwhile, the compressor running frequency is limited by the current.
If the current increases more than I2HEAT, the frequency will decrease automatically, if the current raises to
over I3HEAT,, the compressor will stop and restart 3min later.
During the frequency decreasing, if the current deceases to between I1HEAT, and I3HEAT,, the frequency
will hold. If the frequency not does not for 3min, frequency will increase to a higher level, and it can
increase twice at most.
If the current deceases to lower than I1HEAT, the frequency limit will be invalid.
Model
Current
I1HEAT I2HEAT I3HEAT
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
8.4.3.2 Outdoor fan running rules:
Outdoor fan and compressor start up at the same time, outdoor fan stops 30s after the compressor stops.
The outdoor fan has two speeds, and is controlled by T4 as follows:
Frequency decreases
Frequency
holds
T4
°F °C
62 (17)
59 (15)