Protection; Number Of Indoor Units; Opening Degree Of Electronic Expansion Valve; Low Voltage Protection - Heat Controller A-VMH18DC-1 Service Manual

Service Manual
8.4.4Number of indoor units – displays how many indoor units the outdoor unit is communicating with.

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

Model
A-VMH18DC-1
A-VMH27TC-1
A-VMH36QC-1
Note: if the low voltage protection occurs and does not resume within 3min, it will keep the protection after
the machine is restarted.
Display
1
2
3
4
VOLTAGE
VOLLIMT1
VOLLIMT2
VOLLIMT3
VOLLIMT1 VOLLIMT2 VOLLIMT3
230 200
245 220
200 185
VMH SerieS
Quantity of indoor unit
1
2
3
4
VOLREL1
No limit
VOLFRE1
VOLREL2
VOLFRE2
VOLREL3
Off
VOLREL1 VOLREL2
120 260 210
120 265 240
120 210 195
22
Heat Controller, Inc.
VOLREL3 VOLFRE1 VOLFRE2
135 62
135 78
135 54
54
45
42