Ineffective Coolin g and
Heating
Check again the amoun t of refrige rant to
be added in the pipe s and per form the
operations from the check valve of low
pressure gas pipe.
No
Whether the check
valve of th e outdoor unit is
opened fully?
Yes
When touching by hand along
the flow direction of refriger ant, whether the
pipes have greatly varying temperatures
locally or g et frosty?
Yes
No
Open the check valve u ntil
it reaches its maximum, full
open p osition
No
Cut off the pipes for
confirmation a nd replace
and re-weld th e pipes.
Whether the indoor
and outdo or ambient temperature s
meet the requirements of the unit?
In cooling mo de, check whether th e a mbi ent
temperature of the indo or u nit is higher than
32°C. If it occurs within the first one hour after
star tup, it is acceptable; otherwise, it indicates
that the model configuration is unreasonable.
In cooling mo de, check whether th e o utd oor
ambien t te mp erature is high er tha n 40°C. I f
yes, it is acceptabl e.
In h eating mode, check whether th e a mbi ent
temperature of the indoor u nit is lower than
12°C. If it occurs within the first two hour s after
star tup, it is acceptable; otherwise, it indicates
that the model configuration is unreasonable.
The right mod els should be selected.
In h eating mode, check whether th e o utd oor
ambien t te mp erature is lower than -7°C. I f ye s,
it is acceptable.
Yes
Whether the air outlet
and return of the outdoor unit are short
circuited, thus causing ineffective heat exchanging?
Whether the air return of the indoor unit is short
circuited, thus causing ineffective
heat exchanging?
Yes
Redesign airflow
organizatio n
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