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③ When the compressor signal and 4-way valve signal received from the thermostat are high
level, that is Y-C and B-C are high level, the unit restores the normal target pressure to operate or
when the compressor has operated for 30min【e2】with the decreased target pressure, it is taken
as it has stopped operating.
Compressor running rules:
When the unit starts up in heating mode, the compressor starts to work, and adjust its operating
frequency according to the system target pressure and the actual pressure. If the actual pressure
is higher than the target pressure, the compressor frequency will decrease; if the actual pressure
is lower than the target pressure, the compressor frequency increases; when the target pressure is
reached, the compressor frequency will keep stable.
Outdoor fan running rules:
Once the outdoor fan starts up, it will follow the rules below:
Single outdoor fan: First, it will run in an invariable speed for a short time; Then it will regulate the
speed by the saturation temperature (which is got from high pressure cycling)
Double outdoor fan: If it has two outdoor fans, the upper fan regulates the speed by the rules, and
the downer fan speed is lower than the upper fan speed for 30rpm~60rpm.
17.4 Evaporator Low-temperature Protection
DC-Inverter
AC will enter T2 protection if any of the following condition is satisfied.
Condition:
Cooling mode: When the saturation temperature（which is got from low pressure cycling) T2
keeps lower than TE5 for 120 seconds, the compressor and outdoor fan will shut off. When T2 is
higher than TE6, the compressor and outdoor fan will restart up.
17. CONTORL LOGIC DESCRIPTION
69
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