Daikin RXYQ96PYDN, Service Manual

Page: 428 / 567

SiUS34-801A_b Troubleshooting by Indication on the Remote Controller
Troubleshooting 413
Troubleshooting
Check if the
temperature difference between
the suction pipe and the heat exchanger
is 68 ˚F and over.
Check if the
property of suction pipe thermister
(A7T) and heat exchanger thermister
(R4T) are normal.
(*3)
Check if the
low pressure is 14.5psi
or below. (
∗
1)
Check if the
property of low pressure
sensor is normal.
(
∗
2)
Replace the low pressure
sensor.
Replace the main PC board
(A1P).
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
NO NO
YES YES
Remove the factor of
decreasing low pressure by
referring to
Check 6 .
Remove the factor of
superheating by referring to
Check 3 .
Replace the thermister.
Replace the main PC board.
• With individual systems,
replace the control PC board
1 (A1P) or the control PC
board 3 (A3P).
• With multi systems, replace
the main PC board (A1P).
NO NO
YES
Reset the operation using the remote controller then restart.
Set up a pressure gauge at the service port on the low
pressure side.
Reset the operation using the remote controller then restart.
∗
3: Compare the thermister resistance value with the value on the surface
thermometer.
∗
1: Check the low pressure value by using pressure gauge in operation.
∗
2: Compare the actual measurement value by pressure sensor with the
value by the pressure gauge.
(To gain actual measurement value by pressure sensor, measure the
voltage at the connector [between (2)-(3)] and then convert the value
into pressure referring to P533.)
In heating mode
In cooling mode
Check 6
: Referring to the information on P465.
Check 3
: Referring to the information on P462.
∗
1
∗
2
∗
1
∗
2