Daikin 2MKS40FV1B, Руководство по обслуживанию, Страница: 158 / 206

SiEN12-710A Check
Service Diagnosis 147
Valve Body Condition (Symptom) Check Method / Measure
(1) Valve body catches at fully opened or half
opened position.
(Symptom)
Cooling:
"
Water leakage at the no-operation unit
" Flow noise of refrigerant in the no-operation unit
" Operation halt due to anti-icing function
Heating:
" The unit does not heat
" Refrigerant flow rate vary by unit
(Discharge air temperatures are different by
room)
" Peak cut
Reset power supply and conduct cooling
operation unit by unit.
(2) Valve body catches at complete close
position.
(Symptom)
Cooling:
" The only unit having problem does not cool the
room .
" When the only faulty unit is in operation, the unit
makes pump down.
(The low pressure of the unit becomes vacuum)
" IT is activated.
"
Abnormal discharge pipe temperature
Heating:
Insufficient gas due to liquid refrigerant
stagnation inside
the faulty indoor unit
(Only for heat pump model)
" The unit does not heat the room.
" OL is activated.
" Abnormal discharge pipe temperature
Reset power supply and conduct cooling
operation unit by unit.
(3) Valve does not open fully.
(Symptom)
" The unit does not cool nor heat (only for heat
pump model.)
" OL is actuated.
" Abnormal discharge pipe temperature
Check the number of rotation of shaft if it is 5 and
half from full open to complete close using
manual coil for electronic expansion valve. When
the number of rotation of shaft is less than the
above value, the valve may catch anywhere of
the body.
YE S
(R7154)
NO
Repl a ce the EVn of the room.
Check the li q u id pipe temper a t u re
of no-oper a tion u nit.
I s it a lmo s t
sa me as the o u t s ide a ir
temper a t u re?
(R7155)
Repl a ce the EVn of the room
YE S
NO
Doe s the
pre ssu re b ecome into
v a c uu m zone?
Check the low pre ssu re