Westinghouse WHZ09WMA21S Service Manual page 30

for starting the refrigeration current protective frequency decreasing (E2 value)", over-current frequency
decreasing starts.
Over-current frequency decreasing actions: the compressor will decrease frequency at rate of (E2
value)Hz/S. The indoor and outdoor fans run.
Conditions for ending over-current frequency decreasing: when the current drops below "current value
for starting the refrigeration current protective prohibition of frequency rising (E2 value)", over-current
under-clocking will be released.
3.Prohibition of frequency increasing of compressor exhausting
Conditions for prohibition of frequency rising of compressor discharge
Condition 1: in the case of frequency decreasing of compressor discharge, the discharge temperature of
the compressor drops below X4℃.
Condition 2: in normal operation, the discharge temperature of compressor reaches X5℃.
Either of the above two conditions is met, prohibition of frequency rising of compressor discharge
begins.
Actions relates to prohibition of frequency rising of compressor discharge: the frequency of compressor
maintains at the current level, which may decrease as the case requires while cannot rise. The indoor and
outdoor fans run.
Condition for ending prohibition of frequency rising of compressor discharge: if the temperature of
compressor discharge drops below X6℃, prohibition of frequency rising of compressor discharge will be
released.
4. Prohibition of frequency for anti-overload of outdoor coiled pipe
Condition for anti-overload prohibition of frequency of outdoor coiled pipe: in the case of anti-overload
frequency decreasing of outdoor coiled pipe, anti-overload prohibition of frequency of the unit begins
when the temperature of outdoor coiled pipe drops below "the anti-overload frequency decreasing
temperature of outdoor coiled pipe".
Actions relates to anti-overload prohibition of frequency of outdoor coiled pipe: the frequency of
compressor maintains at the current level, which may decrease as the case requires while cannot rise.
The indoor and outdoor fans run.
Condition for ending anti-overload prohibition of frequency of outdoor coiled pipe: if the temperature of
outdoor coiled pipe drops below "temperature to release the anti-overload state of outdoor coiled pipe",
anti-overload prohibition of frequency of outdoor coiled pipe will be released.
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