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Heat Controller, Inc. VMH SERIES Service Manual
24
8.4.2.5 Evaporator low temperature T2 protection.
When T2<32°F/0°C, the compressor will stop and restart when T2>41°F/5°C.
When 32°F/0°C≤T2<39°F/4°C, the compressor frequency is limited and decreases to the lower level every
minute until stop the compressor stops.
When 39°F/4°C ≤T2≤45°F/7°C, the compressor will keep the current frequency.
When T2>45°F/7°C, the compressor frequency will not be limited.
8.4.3 Heating Mode
8.4.3.1 Compressor running rules:
The operation frequency of compressor after starting submits to following rule.
T4
°F °C
93 (34)
91 (33)
82 (28)
81 (27)
77 (25)
75 (24)
72 (22)
70 (21)
66 (19)
64 (18)
63 (17)
61 (16)
59 (15)
57 (14)
54 (12)
52 (11)
43 (6)
41 (5)