SiAF341904E
Check
Part 6 Service Diagnosis
293
6.6 Refrigerant Shortage Check
CHECK 7
In case of
VRV
systems, the only way to judge as the shortage of refrigerant is with operating
conditions due to the relationship to pressure control and electronic expansion valve control.
As information for making a judgment, refer to the information below.
Diagnosis of refrigerant shortage
1. The superheating degree of suction gas rises. Consequently, the compressor discharge gas
temperature becomes higher.
2. The superheating degree of suction gas rises. Consequently, the electronic expansion valve
turns open.
3. Low pressure drops to cause the unit not to demonstrate cooling capacity.
Cooling
High press
u
re
Lo
w
press
u
re
Fre
qu
ency
The opening degree of the indoor
u
nit
electronic expansion
v
al
v
e
b
ecomes
larger.
Either of the electronic expansion
v
al
v
es
b
ecomes f
u
lly open.
Fre
qu
ency comes to the minim
u
m le
v
el.
Fan control is acti
v
ated for high
press
u
re protection
u
nder
cooling control at lo
w
o
u
tdoor
air temperat
u
re, i.e., the fan is
h
u
nting at high press
u
re.
High press
u
re drops
w
ith decrease in
compressor capacity.
If fre
qu
ency comes to the
minim
u
m le
v
el, lo
w
press
u
re cannot
b
e
maintained.
Lo
w
press
u
re rises as the
opening degree of the indoor
u
nit electronic expansion
v
al
v
e
b
ecomes larger.
Fre
qu
ency slightly increases
u
nder the capacity control.
(Degree of refrigerant shortage)
Higher degree of shortage
Proper amo
u
nt
(Lo
w
press
u
re
is maintained at
a constant
le
v
el.)
To maintain lo
w
press
u
re,
fre
qu
ency drops
d
u
e to the
capacity control.
Содержание RXQ12AHR
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Страница 312: ...SiAF341904E 306 Part 7 Appendix 1 Wiring Diagrams 307 1 1 Outdoor Unit 307 1 2 VRV Indoor Unit 310 Part 7 Appendix...
Страница 313: ...SiAF341904E Wiring Diagrams Part 7 Appendix 307 1 Wiring Diagrams 1 1 Outdoor Unit RXQ6 8 10 12ARY1 3D112175E...
Страница 314: ...Wiring Diagrams SiAF341904E 308 Part 7 Appendix RXQ14ARY1 2D112174G...
Страница 315: ...SiAF341904E Wiring Diagrams Part 7 Appendix 309 RXQ16 18 20ARY1 2D112524F...
Страница 317: ...SiAF341904E Wiring Diagrams Part 7 Appendix 311 1 2 2 Auto Grille Panel BYCQ125EASF for FXFSQ 3D108035...
Страница 319: ...SiAF341904E Wiring Diagrams Part 7 Appendix 313 FXMQ40 50 63 80 100ARV1 3D112427A...
Страница 320: ...Wiring Diagrams SiAF341904E 314 Part 7 Appendix 1 2 4 Wall Mounted Type FXAQ20 25 32PVE FXAQ40 50 63PVER1 C 3D076498B...
