Daikin FTKS50BVMB, Service Manual

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SiEN18-622 Troubleshooting for Outdoor Unit
Troubleshooting 377
7.16 Malfunction of Low Pressure Sensor
Remote Control
Display
JC
Applicable
Models AII outdoor unit models
Method of
Malfunction
Detection Malfunction is detected from pressure detected by low pressure sensor.
Malfunction
Decision
Conditions When the low pressure sensor is short circuit or open circuit.
Supposed
Causes „ Defect of low pressure sensor
„
Connection of high pressure sensor with wrong connection.
„ Defect of outdoor unit PCB.
Troubleshooting
∗
1: Voltage measurement point
∗
2: Refer to “Pressure Sensor”, pressure/voltage characteristics table on P409.
(V2 8 0 8 )
Caution
NO
NO
YE S
YE S
Be su re to t u rn off power s witch b efore connect or di s connect connector,
or p a rt s d a m a ge m a y b e occ u rred.
The low
pre ssu re s en s or i s
connected to X1 8 A
( b l u e)of o u tdoor u nit PC
b o a rd (A1P).
The
rel a tion s hip
b etween the * 1
VL a nd low pre ssu re i s
norm a l ( s ee * 2) when volt a ge
i s me asu red b etween X1 8 A
pin s (2) a nd ( 3 ) of o u tdoor
u nit PC b o a rd
(A1P)
( s ee * 1)
Connect low pre ssu re
s en s or property a nd
re s t a rt s y s tem.
Repl a ce o u tdoor u nit PC
b o a rd (A1P).
Repl a ce the low pre ssu re
s en s or.
O u tdoor u nit PC b o a rd A1P
+5V
Microcomp u ter
A/D inp u t
* 2 Me asu re volt a ge here.
X1 8 A
Red
Bl a ck
White
Lo
w pre
ssu
re
s
en
s
or
(V2 8 09)
GND