24
Service Manual
VMH 30, 36 SerieS
Heat Controller
22
8.4.2.2 Indoor fan running rules
In cooling mode, indoor fan runs all the time and the speed can be selected as high, medium, low and
auto.
Auto fan in cooling mode acts as follow:
8.4.2.3 Condenser high temperature T3 protection.
When 131°F (55°C)<T3<140°F (60°C), the compressor frequency will decrease to the lower level until
to F1 and then runs at F1.
When T3<129°F (54°C), the compressor will keep running at the current frequency.
When T3<125.5°F(52°C), the compressor will not limit the frequency and resume to the former
frequency.
When T3<140°F(60°C) for 5 seconds, the compressor will stop until T3<125.6°F(52°C).
8.4.2.4 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<40°F(4°C), the compressor frequency will be limited and decreased to the lower
level every minute.
When 40°F(4°C) <T2<44.5°F(7°C), the compressor will keep the current frequency.
When T2>44.5°F(7°C), the compressor frequency will not be limited.
°F
39°
37°
36°
34°
C°
(4.0)
(3.0)
(1.5)
(1.0)
