Ineffective Cooling a nd
Heating
Check aga in the amoun t of refrige rant to
be added in the pipe s and perform th e
operations from the check valve o f low
pressure gas pipe.
No
Whether th e check
valve of the outdoor unit is
opened fully?
Yes
When touching by hand along
the flow direction of refrigerant, whether the
pipes have greatly varying temperatures
locally or g et frosty?
Yes
No
Open the check valve until
it reaches its maximu m, full
open p osition
No
Cut off the pipes for
confirmatio n a nd replace
and re-weld the pipes.
Whether th e indoor
and ou tdoor ambient temperature s
meet the requ irements of the unit?
In cooling mode, check whether th e a mbient
temperature of the indo or unit is higher than
32°C. If it occurs within the first one hour after
star tup , it is acceptabl e; otherwise, it in dicates
that the model co nfiguration is unr easonable.
In cooling mode, check whether th e o utdoor
ambien t temp erature is higher tha n 40°C. If
yes, it is acceptabl e.
In h eating mode, check whether th e a mbient
temperature of the indoor u nit is lo wer than
12°C. If it occurs within the first two hours after
star tup , it is acceptabl e; otherwise, it in dicates
that the model co nfiguration is unr easonable.
The right models should be selected.
In h eating mode, check whether th e o utdoor
ambien t temp 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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