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Service Manual VMH SerieS Heat Controller, Inc.
8.4.4Number of indoor units – displays how many indoor units the outdoor unit is communicating with.
Display Quantity of indoor unit
1 1
2 2
3 3
4 4
8.4.5 Opening degree of electronic expansion valve:
Actual opening degree value equals the display data divided 8
8.5 Protection
8.5.1 Three minutes delay at restart for compressor.
8.5.2 Temperature protection of compressor discharge.
When the compressor discharge temp. is getting higher, the running frequency will be limited as below rules:
----If 216°F<T5< 239°F (102°C<T5<115°C), the frequency or the compressor will decrease to a lower level
every 2 minutes until it reaches F1.
---If T5>239°F(T5>115°C) for 10 seconds, the compressor will stop and restart till T5<194°F (T5<90°C).
8.5.3 Low voltage protection
VOLLIMT1
VOLTAGE
No limit
VOLLIMT2
VOLLIMT3
Off
VOLFRE2
VOLFRE1
VOLREL1
VOLREL2
VOLREL3
Model VOLLIMT1 VOLLIMT2 VOLLIMT3 VOLREL1 VOLREL2 VOLREL3 VOLFRE1 VOLFRE2
A-VMH18DC-1 230 200 120 260 210 135 62 54
A-VMH27TC-1 245 220 120 265 240 135 78 45
A-VMH36QC-1 200 185 120 210 195 135 54 42
Note: if the low voltage protection occurs and does not resume within 3min, it will keep the protection after
the machine is restarted.